WO2013095903A1 - Novel gh-rh analogs with potent agonistic effects - Google Patents
Novel gh-rh analogs with potent agonistic effects Download PDFInfo
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- WO2013095903A1 WO2013095903A1 PCT/US2012/067690 US2012067690W WO2013095903A1 WO 2013095903 A1 WO2013095903 A1 WO 2013095903A1 US 2012067690 W US2012067690 W US 2012067690W WO 2013095903 A1 WO2013095903 A1 WO 2013095903A1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/575—Hormones
- C07K14/60—Growth hormone-releasing factor [GH-RF], i.e. somatoliberin
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P3/00—Drugs for disorders of the metabolism
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P5/00—Drugs for disorders of the endocrine system
- A61P5/06—Drugs for disorders of the endocrine system of the anterior pituitary hormones, e.g. TSH, ACTH, FSH, LH, PRL, GH
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P9/00—Drugs for disorders of the cardiovascular system
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/575—Hormones
- C07K14/61—Growth hormone [GH], i.e. somatotropin
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
Definitions
- the present invention relates to growth hormone-releasing hormone (GH-RH) analogous peptides having high binding affinity to GH-RH receptor in vitro and having influence on the function of the pituitary gland in vivo.
- the present invention is directed to synthetic peptides which promote the release of growth hormone by the pituitary gland. More particularly, the present invention relates to hGH-RH analogs of 29 or 30 amino acids that show much higher affinity to the GH- RH receptor than the native hGH-RH(1 -29)NH 2. .
- This invention also relates to a pharmaceutical composition comprising any one of said GH-RH agonists and to the use of these agonistic peptides in the treatment or prevention of disorders.
- hGH-RH human pancreatic growth hormone releasing hormone
- a fragment of GH-RH containing at least 29 amino acid residues has at least 50% of the potency of natural GH-RH; further deletion of amino acid residues results in a marked decrease in bioactivity [Cambell RM et al. Peptides 12: 569-574 (1991 )];
- hydrophobic groups at the C-terminal of a peptides sequence can result in significantly increased specific activity. In terms of hydrophobicity, these results are contradicted by works of other groups, e.g. Muranichi [Muranichi S et al. Pharm. Res. 8: 649-652 (1991 )];
- U.S. Pat. No. 4,914,189 discloses agonists having Dat at position 1 , D-Ala at position 2, Lys or Orn at position 12, Gly at position 15, Lys at position 21 and Agm at position 29. It should be noted however that those agonists said to have had greater potency in inducing GH release than hGH-RH(1 -29) had Lys at position 12 and D-Ala at position 2. [0011]. In U.S. Pat. No.
- 4,689,318 analogs of hGH-RH(1 -29) may have Lys 2 or Lys 2 replaced by Orn and in which position 8 could be Ser (rat GH-RH sequence), Asn (human GH-RH sequence), Thr (mouse GH-RH sequence) or Gin (not naturally occurring in GH-RH); and position 27 could be Nle.
- position 1 is never Dat
- position 15 never Abu
- position 29 never Agm
- Arg-NH-CH 3 or Arg-NH-CH 2 -CH 3 .
- Those analogs said to have potency as strong as hGH-RH(1 -40) had substitutions by Arg at positions 12 and 21 .
- hGH-RH(1 -29) agonists are taught in PCT patent applications numbers WO 94/1 1396 and 94/1 1397, where at position 12, Lys 12 is to be replaced by D-Lys, Arg or Orn. These analogs may also contain Dat as R ; Asn, D-Asn, Ser, D-Ser as R 8 ; Abu as R 5 ; Lys, D-Lys, Arg or D-Arg as R 2 ; Nle as R 27 ; Asp or Ser as R 28 ; and Agm as R 29 . Those agonists which are said to induce GH at levels exceeding those induced by hGH-RH(1 -29) had Lys at positions 12.
- European Patent Application 0 413 839 discloses further hGH-RH analogs in which positions 12 and 21 may both be Lys or Orn, and where position 15 is Ala. However, those analogs tested for GH releasing ability and said to have greater potency than hGH-RH(1 -29) had Lys at positions 12 and 21 .
- U.S. Pat. No. 5262519 discloses agonists having the following substitutions: N-MeTyr at position 1 , Ser at position 8, Ala at position 15, Ala or Aib at positions 16, 24, and 25, Asn at position 28, and -NHR at the C-terminus with R being H or lower alkyl. It should be noted however that these agonists said to have had greater potency in inducing GH release than hGH-RH(1 -29) never had Gin or Thr at position 8, Orn at positions 12 and 21 , Abu at position 15, and Asp at position 28. [0015].
- 5,792,747 discloses GH-RH agonists having Dat at position 1 ; Glu at position 3; Ser, Gin, or Thr at position 8; Orn at positions 12 and 21 ; lie at position 13; Ala or Abu at positions 15, 22, and 23; Glu at position 25; NIe, lie, or Leu at position 27; Asn or Asp at position 28; and Agm at position 29. It should be noted however that those agonists said to have had greater potency in inducing GH release than hGH-RH(1 -29) never had N-Me-Tyr , D-Ala 2 , and/or -NH-CH 3 or -NH-CH 2 -CH 3 at the C-terminus.
- U.S. Pat. No. 7,928,063 discloses GH-RH agonists having the following substitutions: Dat at position 1 ; 6-guanidino-2-caproic acid (hArg), 4-guanidine-2- aminobutyric acid (Gab), or 3-guanidino-2-aminopropionic acid (Gap) at positions 1 1 and 20; Orn, hArg, Gab, or Gap at positions 12 and 21 ; Ala at position 15, NIe at position 27; and D-Arg, hArg, Gab, or Gap at position 29.
- These peptides are said to exhibit high resitance to enzymatic actions and are potent and selective GH release stimulators. It should be noted however that these agonists have been tested and showed high stability only in trypsin digestion test.
- hGH-RH(1 -29) analogs are taught in US published application 2009/0023646 A1 and WO 2009/009727 A2, where the most potent compound has Ala 2 , Tyr 0 , Gly 5 , and Leu 22 replaced by D-Ala 2 , D-Tyr 0 , D-Ala 15 , and Lys 22 , respectively, showed binding to GH-RH receptor on somatotrophs in rat and dog pituitaries and was at least two times more potent in vivo than the natural GH-RH(1 - 44).
- hGH-RH(1 -44) and its analogs are subject to biological inactivation by both enzymatic and chemical routes.
- hGH-RH is rapidly degraded via dipeptidylpeptidase IV (DPP-IV) cleavage between residues 2 and 3 [Frohman et al., J. Clin. Invest. 83, 1533-1540 (1989), Kubiak et al. Drug Met. Disp. 17, 393-397 (1989)]. the major cleavage site in plasma.
- DPP-IV dipeptidylpeptidase IV
- the major cleavage sites are between Leu 14 - Gly 5 (chymotrypsin-like enzymes) and between Lys 2 - Leu 22 (trypsin-like enzymes) [Boulanger et al. Brain Res. 616, 39-47 (1993)]. Other trypsin specific cleavages at basic amino acid residues are also observed.
- the hGH-RH(1 -44) is also subject to chemical rearrangement [forming Asp 8 or beta-Asp 8 from Asn via aminosuccinimide formation] and oxidation [Me ⁇ O)' 7 from Me 7 ] in aqueous environment that greatly reduce its bioactivity.
- hGH-RH analogs by multiple amino acid substitutions that have elevated binding affinities to the pituitary receptors in vitro, and increased potencies in vivo as compared to the native hGH-RH(1 -29)NH 2 .
- modifications in the peptide chain can be made in accordance with the known experimental practices to date to create peptides or peptide fragments that retain all or very substantial portions of the biological potency of the peptide, and such peptides are considered as being within the scope of the invention.
- additions may be made to either terminus, or to both terminals, and/or generally equivalent residues can be substituted for naturally occurring residues, as is well-known in the overall art of peptide chemistry, to produce other analogs having at least a substantial portion of the potency of the claimed polypeptide without deviating from the scope of the invention.
- the carboxyl moiety of the amino acid residue at the C-terminus can be the radical ⁇ COOR, ⁇ CRO, ⁇ CONHNHR,--CON(R)(R') or ⁇ CH 2 -OR, with R and R' being lower alkyl, fluoro lower alkyl or hydrogen, without deviating from the invention, for such modifications result in equivalent synthetic peptides. (Rivier US Patent 5262519).
- novel series of synthetic peptide analogs of hGH-RH(1 - 29)NH 2 or hGH-RH(1 -30)NH 2 The novel synthetic peptides of this invention exhibit high activities in stimulating the release of pituitary GH in animals, including humans. They also show extremely high binding capacity to the hGH-RH receptor. These synthetic hGH-RH analogs also retain their physiological activity in solution for an extended period of time and resist enzymatic degradation in the body.
- the stronger GH releasing potencies of the new analogs in vivo results from combination of replacements in hGH-RH(1 -29)NH 2 or hGH-RH(1 -30)NH 2 and from resistance to in vivo degradation.
- Asn at position 8 is replaced by Gin, Thr, or Ala.
- Met in position 27 is replaced by norleucine (Nle). Replacement of other residues in the peptides and the combination of these replacements also are found to promote biological activity.
- Ri is Ac, Tfa, or is absent
- a 1 is Tyr, Dat, or N-Me-Tyr,
- a 2 is Ala, D-Ala, Abu, or D-Abu,
- a 6 is Phe or Fpa5,
- a 8 is Asn, Ala, Gin, Thr, or N-Me-Ala,
- a 11 is Arg, His, or Har
- a 12 is Orn, or Lys(Me) 2 ,
- a 15 is Abu or Ala
- a 20 is Arg, His, or Har
- a 21 is Orn, or Lys(Me) 2 ,
- a 22 is Leu, or Orn,
- a 28 is Ser, or Asp,
- a 29 is Arg, Har, Agm, D-Arg, or D-Har,
- a 30 is Arg, Agm, Ada, Amc, Aha, Apa, Har, D-Arg, D-Har, Gab, Gin, D-Gln, Gin-Gab, D-Gln-Gab, or is absent,
- R 2 is -NH 2 , -OH, -NHR.3 , -N(R 3 ) 2 , or -OR 3 , in which R 3 is any of Ci_ 12 alkyl, C 2 -i 2 alkenyl, or C2-12 alkinyl,
- a 29 is Agm then A 30 and R 2 are absent and suitably A 1 is N- Me-Tyr only, and further preferably provided that where A 30 is Agm then R 2 is absent, and pharmaceutically acceptable salts thereof.
- amino acid residues and synthetic peptides are that specified by the lUPAC-IUB Commission on Biochemical Nomenclature (European J. Biochem., 1984, 138, 9-37).
- natural amino acid is meant one of the common, naturally occurring amino acids found in proteins comprising Gly, Ala, Val, Leu, lie, Ser, Thr, Lys, Arg, Asp, Asn, Glu, Gin, Cys, Met Phe, Tyr, Pro, Trp and His.
- NIe norleucine
- Abu alpha amino butyric acid
- Orn is meant ornithine.
- Trt trityl (triphenylmethyl)
- amino acid sequences of the synthetic peptides are numbered in correspondence with the amino acid residues in hGH-RH(1 -29); thus, for example, the Ala 4 and R 8 in the synthetic peptides occupy the same position in the sequence as the Ala 4 and R 8 residues in hGH-RH(1 -29).
- the hGH-RH agonists of the present invention were designed to increase Gh release at the pituitary level.
- Particularly preferred embodiments of the synthetic peptides of the present invention are shown in Table 1 :
- the peptides are synthesized by suitable methods such as by exclusive solid phase techniques, by partial solid-phase techniques, by fragment condensation or by classical solution phase synthesis.
- suitable methods such as by exclusive solid phase techniques, by partial solid-phase techniques, by fragment condensation or by classical solution phase synthesis.
- exclusive solid- phase synthesis are set forth in the textbook "Solid Phase Peptide Synthesis", J.M. Stewart and J.D. Young, Pierce Chem. Company, Rockford, Illinois, 1984 (2nd. ed.), and M. Bodanszky, "Principles of Peptide Synthesis", Springer Verlag, 1984.
- the hGH-RH agonist peptides are preferably prepared using solid phase synthesis, such as that generally described by Merrifield, J.Am. Chem. Soc, 85 p. 2149 (1963), although other equivalent chemical syntheses known in the art can also be used as previously mentioned.
- the synthesis is carried out with amino acids that are protected at their alpha amino group.
- Urethane type protecting groups Boc or Fmoc
- Boc or Fmoc are preferably used for the protection of the alpha amino group.
- protected omega-amino acids are also used during the synthesis. Boc or Fmoc protecting groups are also appropriate for the protection of omega-amino groups.
- Boc or Fmoc protecting groups are also appropriate for the protection of omega-amino groups.
- the N-alpha-protected or N-omega-protected amino acid moiety which forms the aminoacyl group of the final peptide at the C-terminus is attached to a polymeric resin support via a chemical link.
- the alpha (or omega) amino protecting group is selectively removed to allow subsequent coupling reactions to take place at the amino-terminus, preferably with 50% TFA in DCM when the N-alpha- (N-omega-) protecting group is Boc, or by 20% piperidine in DMF when the N-alpha- (N-omega-) protecting group is Fmoc.
- the remaining amino acids with similarly Boc or Fmoc-protected alpha (or omega) amino groups are coupled stepwise to the free amino group of the preceding amino acid on the resin to obtain the desired peptide sequence.
- the amino acid residues are coupled to the alpha (or omega) amino group of the C-terminus residue
- growth of the synthetic hGH-RH analogue peptides begins at the C terminus and progresses toward the N-terminus.
- the peptide is acylated, or the amino group is left free at the N-terminus, and the peptide is removed from the support polymer. [0036].
- Each protected amino acid is used in excess (2.5 or 3 equivalents) and the coupling reactions are usually carried out in DCM, DMF or mixtures thereof. The extent of completion of the coupling reaction is monitored at each stage by the ninhydrin reaction. In cases where incomplete coupling is determined, the coupling procedure is repeated, or a capping by acetylation of unreacted amino groups is carried out, before removal of the alpha (or omega) amino protecting group prior to the coupling of the next amino acid.
- the hGH-RH agonist peptides may be synthesized on a variety of support polymers, i.e. MBHA, Merrifield, PAM, Rink amide or Wang resins.
- the peptides can also be synthesized on aminomethyl, MBHA, or other resins that have been previously derivatized with suitable linkers.
- linkers examples include the base- labile 4-hydroxymethyl benzoic acid (HMBA) linker for the attachment of C-terminal carboxyl groups, the acid-labile para-sulfonyl-phenoxyacetyl (SPA) linker which permits the attachment of agmatine through its guanidino group, or the acid-labile [3- [(Methyl- Fmoc-amino)methyl]-indol-1 -yl]-acetyl linker which allows the synthesis of peptides with C-terminal methylamide (-NH-CH 3 ).
- HMBA 4-hydroxymethyl benzoic acid
- SPA acid-labile para-sulfonyl-phenoxyacetyl
- SPA acid-labile [3- [(Methyl- Fmoc-amino)methyl]-indol-1 -yl]-acetyl linker which allows the synthesis of peptides with C-terminal methylamide (-NH
- the preferred resin is MBHA. Attachment of the C-terminal amino acid to this resin can be accomplished by the standard DIC-mediated coupling method described in Table 2. [0040].
- the support phase is MBHA resin or an aminomethyl resin
- the guanidino group of Boc-Agm is joined to the support polymer through a stable, but readily cleavable linker such as the para-sulfonyl-phenoxyacetyl (SPA) moiety.
- SPA para-sulfonyl-phenoxyacetyl
- the alpha-amino-Boc-protected Agm is reacted with the chlorosulfonyl phenoxyacetic acid CI-S0 2 -C 6 H 4 -0-CH 2 -COOH to form Boc-Agm-S0 2 -C 6 H 4 -0-CH 2 - COOH.
- This compound is then coupled to the support polymer e.g. to MBHA resin using DIC or HBTU-HOBt-DIEA as activating reagent to yield Boc-Agm-SPA-MBHA.
- the support polymer e.g. to MBHA resin using DIC or HBTU-HOBt-DIEA as activating reagent to yield Boc-Agm-SPA-MBHA.
- Agm-S0 2 -PS resin is used for the synthesis (1 % DVB, 100-200 mesh, 2.5 mmol/g, Advanced ChemTech (Louisville, KY)) at pH 10-13 to from Boc- Agm-S0 2 -resin
- Bifunctional amino acids i.e. those not having side chain functional groups, are mostly used in the form of their N-alpha Boc- or Fmoc- derivatives for synthesis.
- Bifunctional omega-amino acids are also typically used in the form of their N-omega Boc- or Fmoc- derivatives.
- Boc-Gly-OH or Fmoc-Gly-OH is typically used for incorporating the Gly residue.
- the naturally occurring bifunctional amino acids are Gly, Ala, Val, Leu, He, Phe, and Pro, and some well-known non-coded bifunctional amino acids used in this invention are Abu, Aib, Gab, Nle, Aah, and Aap.
- the amino acid residues of the peptides have side chain functional groups which are reactive with reagents used in coupling or deprotection. When such side chain groups are present, suitable protecting groups are joined to these functional groups to prevent undesirable chemical reactions occurring during the coupling reactions. [0044].
- the following general rules are followed in selecting a particular side chain protecting group: (a) the protecting group preferably retains its protecting properties and is not split off under coupling conditions, (b) the protecting group should be stable under conditions for removing the alpha amino protecting group at each step of the synthesis, (c) the side chain protecting group must be removable upon the completion of the synthesis of the desired amino acid sequence, under reaction conditions that will not undesirably alter the peptide chain.
- Boc-amino acids When Boc-amino acids are used in the synthesis, the reactive side chain functional groups can be protected as follows: Tos or nitro (N0 2 ) for Arg and Har; cHx or Fm for Asp and Glu; Bom for His; 2CIZ or Fmoc for Lys and Orn; Bzl for Ser and Thr; and 2BrZ for Tyr.
- the side chains of Asn and Gin are unprotected.
- the reactive side chain functional groups can be protected by other appropriate protective groups as follows: 2,2,4,6,7- pentamethyl-dihydrobenzofurane-5-sulfonyl (Pbf), 4-methoxy-2,3,6- trimethylbenzenesulphonyl (Mtr), or bis-Boc for Arg and Har; tert-butyl (Bu 1 ) for Asp and Glu; no protective group or trityl (Trt) protection for Asn and Gin; Trt for His; Boc or 4-methoxytrityl (Mmt) for Lys and Orn; fBu or Trt for Ser and Thr; and fBu or 2- chlorotrityl (2CITrt) for Tyr.
- Pbf 2,2,4,6,7- pentamethyl-dihydrobenzofurane-5-sulfonyl
- Mtr 4-methoxy-2,3,6- trimethylbenzenesulphonyl
- 2CITrt 2- chlorot
- some of the peptides of this application contain less common non-coded amino acids such as homoarginine (Har); ornithine (Orn); N- methyl-alanine [N-Me-Ala]; N-methyl-tyrosine [N-Me-Tyr]; pentafluoro-phenylalanine [Phe(F) 5 , Fpa5 ].
- These amino acid residues are incorporated into the peptides by coupling the suitable protected amino acid derivatives.
- a non-exclusive list of such protected amino acid derivatives that can be used is as follows: Boc-Har(Tos)-OH, Boc-Orn(2CIZ)-OH, Boc-N-Me-Ala-OH, Boc-N-Me-Tyr(2BrZ)-OH, Boc-Fpa5-OH, Fmoc-Har(Pbf)-OH, Fmoc-Orn(Boc)-OH, Fmoc-N-Me-Ala-OH, and Fmoc-N-Me- Tyr(2CITrt)-OH.
- the peptide itself may suitably be built up by solid phase synthesis in the conventional manner.
- Each protected amino acid is coupled in about a three-fold molar excess, with respect to resin-bound free amino residues, and the coupling may be carried out in a medium such as DMF— DCM (1 :1 ) or in DMF or DCM alone.
- DMF— DCM (1 :1 )
- DMF or DCM alone.
- the selection of an appropriate coupling reagent is within the skill of the art.
- Particularly suitable as coupling reagents are ⁇ , ⁇ '- diisopropyl carbodiimide (DIC), or HBTU combined with HOBt in the presence of DIEA.
- the success of the coupling reaction at each stage of the synthesis is preferably monitored by the ninhydrin reaction. In cases where incomplete coupling occurs, either the coupling procedure is repeated, or the resin-bound unreacted amino residues are acetylated using a capping reagent, before removal of the alpha (or omega) amino protecting group.
- Suitable capping reagents are 1 -acetylimidazole and Ac 2 0 in pyridine
- peptides with an amidated C-terminus (-CONH 2 ) or with a C- terminal carboxyl group (-COOH) are prepared by Boc strategy on an MBHA, Merrifield, or PAM resin
- the removal of the peptide from the resin is performed by treatment with a reagent such as liquid hydrogen fluoride (HF).
- HF liquid hydrogen fluoride
- the liquid HF also cleaves all the remaining side chain protecting groups.
- additional cleavage steps should be performed in order to remove these protecting groups.
- Fm and Fmoc protecting groups are removed by treatment with 20% piperidine in DMF, prior to or after the HF treatment.
- the dried and protected peptide-resin is treated with a mixture consisting of 1 .0 mL m-cresol and 10 mL anhydrous hydrogen fluoride per gram of peptide-resin for 60-120 min at 0 Q C to cleave the peptide from the resin as well as to remove the HF-labile side chain protecting groups.
- the free peptides are precipitated with ether, filtered, washed with ether and ethyl acetate, extracted with 50% acetic acid, and lyophilized.
- the quantity of liquid CH 3 NH 2 or CH 3 CH 2 NH 2 should be sufficient to cover the peptide-resin.
- the flask is stoppered, and shaken with the liquid CH 3 NH 2 or CH 3 CH 2 NH 2 for 3.5 hours at room temperature in order to allow for the reaction to take place. After this, the flask is cooled in a dry ice bath, opened, and the liquid CH 3 NH 2 or CH 3 CH 2 NH 2 is filtered off the solid residue that contains a mixture of resin and cleaved peptide, the peptide still having the protecting groups attached. [0052]. The solid residue is dried and subjected to HF treatment as described above, in order to remove the side chain protecting groups of the peptide.
- cleavage cocktail Since no single cleavage and deprotection procedure is optimal for all peptides due to the nature of the linker and the amino acid composition of the peptide, the following cleavage cocktail proved to be the most suitable for cleavage and deprotection of GHRH agonists: 94% TFA, 3% H 2 0, 1 .5% m-cresol, and 1 .5% phenol.
- Cleavage cocktail must be prepared fresh and have to use high quality TFA and scavengers. The amount of cleavage cocktail used depends on both the amount of the peptide-resin and its properties. Enough cocktail solution should be used to saturate and swell the resin during the reaction, with about 2-3 mm of clear solution below the floating beads.
- cleavage cocktail Generally 5 mL of cleavage cocktail is used for 0.5 g of resin.
- the choice of reaction time depends on the linker and the side-chain protecting groups of the peptide. Preferably, 3-hour reaction time is used for the cleavage and deprotection of GHRH agonists.
- the cleavage mixture is added dropwise to cold (preferably -20°C) ether. The non-peptide products remain in the ether solution. The precipitated material is collected by filtration or centrifugation and is washed three times with cold ether to remove any residual scavengers.
- the cleaved and deprotected peptide is dissolved in 50% acetic acid and separated from the resin by filtration and, after dilution with water, the solution is lyophilized.
- the purification of the crude peptides can be effected using procedures well known in peptide chemistry.
- purification may be performed on a Beckman System Gold HPLC system (Beckman Coulter, Inc., Brea, CA) equipped with 127P solvent Module; UV-VIS Detector, model 1 66P; Computer workstation with CPU Monitor and printer, and 32-Karat software, version 3.0 using an XBridge Prep OBDTM reversed phase column (4.6 x 250 mm, packed with Ci 8 silica gel, 300 A pore size, 5 ⁇ particle size) (Waters Co., Milford, MA).
- the column is eluted with a solvent system consisting of (A) 0.1 % aqueous TFA and (B) 0.1 % TFA in 70% aqueous MeCN in a linear gradient mode (e.g., 30-55% B in 1 20 min); flow rate of 1 2 mL/min.
- a solvent system consisting of (A) 0.1 % aqueous TFA and (B) 0.1 % TFA in 70% aqueous MeCN in a linear gradient mode (e.g., 30-55% B in 1 20 min); flow rate of 1 2 mL/min.
- the eluent is monitored at 220 nm, and fractions are examined by analytical HPLC using a Hewlett-Packard Model HP-1 090 liquid chromatograph and pooled to give maximum purity.
- Analytical HPLC is carried out on a Supelco Discovery HS C1 8 reversed-phase column (2.1 x 50 mm, C18, 300 A pore size, 3 ⁇ particle size) (Supelco, Bellefonte, PA) using isocratic elution with a solvent system consisting of (A) and (B) defined above with a flow rate of 0.2 mL/min. The peaks are monitored at 220 and 280 nm. The peptides are judged to be substantially (>95%) pure by analytical HPLC. Molecular masses are checked by electrospray mass spectrometry (Agilent Technologies 6210 Time-of-Light LC/MS, Santa Clara, CA) and the expected amino acid compositions are confirmed by amino acid analysis
- the peptides of the invention may be administered in the form of pharmaceutically acceptable, nontoxic salts, such as acid addition salts.
- acid addition salts are hydrochloride, hydrobromide, sulphate, phosphate, fumarate, gluconate, tannate, maleate, acetate, trifluoroacetate, citrate, benzoate, succinate, alginate, pamoate, malate, ascorbate, tartarate, and the like.
- Particularly preferred agonists are salts of low solubility, e.g., pamoate salts and the like. These exhibit long duration of activity.
- the compounds of the present invention are suitably administered to subject humans or animals subcutaneously (s.c), intramuscularly (i.m.), or intravenously (i.v); intranasally or by pulmonary inhalation; by transdermal delivery; or in a depot form (e.g., microcapsules, microgranules, or cylindrical rod like implants) formulated from a biodegradable suitable polymer (such as D,L-lactide-coglycolide), the former two depot modes being preferred.
- a biodegradable suitable polymer such as D,L-lactide-coglycolide
- Other equivalent modes of administration are also within the scope of this invention, i.e., continuous drip, cutaneous patches, depot injections, infusion pump and time release modes such as microcapsules and the like.
- the peptides are preferably administered parenterally, intramuscularly, subcutaneously or intravenously with a pharmaceutically acceptable carrier such as isotonic saline. Alternatively, the peptides may be administered as an intranasal spray with an appropriate carrier or by pulmonary inhalation.
- a suitable route of administration is a depot form formulated from a biodegradable suitable polymer, e.g., poly-D,L-lactide-coglycolide as microcapsules, microgranules or cylindrical implants containing dispersed antagonistic compounds. [0058].
- the amount of peptide needed depends on the type of pharmaceutical composition and on the mode of administration.
- the typical doses are between 2-20 mg/day/patient, given once a day or divided into 2-4 administrations/day.
- typical doses are in the range of 8-80 ⁇ g kg of body weight/day, divided into 1 -4 bolus injections/day or given as a continuous infusion.
- depot preparations of the GH-RH agonists are used, e.g. by i.m.
- the typical doses are between 1 -10 mg agonist/day/patient
- the products of the present invention may be utilized to promote the growth of warm-blooded animals (e.g., humans) and also enhance the milk production of females of milk producing mammals, suitably but not exclusively goats and cows, preferably cows.
- warm-blooded animals e.g., humans
- milk production of females of milk producing mammals suitably but not exclusively goats and cows, preferably cows.
- the peptides of the invention may be administered in the form of pharmaceutically acceptable, nontoxic salts, such as acid addition salts.
- acid addition salts are hydrochloride, hydrobromide, sulphate, phosphate, fumarate, gluconate, tannate, maleate, acetate, citrate, benzoate, succinate, alginate, pamoate, malate, ascorbate, tartrate, and the like.
- the compounds of the present invention are suitably administered to the subject humans or animals s.c, i.m., or i.v; intranasally or by pulmonary inhalation; or in a depot form (e.g., microcapsules, microgranules, or cylindrical rod like implants) formulated from a biodegradable suitable polymer (such as D,L-lactide-co-glycolide), the former two depot modes being preferred.
- a biodegradable suitable polymer such as D,L-lactide-co-glycolide
- Other equivalent modes of administration are also within the scope of this invention, i.e., continuous drip, depot injections, infusion pump and time release modes such as microcapsules and the like.
- Administration is in any physiologically acceptable injectable carrier, physiological saline being acceptable, though other carriers known to the art may also be used.
- the dosage level is suitably between 0.01 ⁇ g and 2 ⁇ g kg body weight per injection, except for depot form where the amount injected would be calculated to last from about 15 to about 30 days or longer. These dosage ranges are merely preferred. Administration of non-depot forms may be between 1 and 4 times per day, or in the case of lactating mammals, after each milking. [0063]. Until the production of growth hormone by recombinant-DNA methods began, the small supply of pituitary-derived human growth hormone limited its use to the treatment of children with growth hormone deficiency. The wide availability of synthetic human growth hormone has made possible long-term studies of other potentially beneficial uses of growth hormone and its more physiologic actions.
- hGH is currently approved only for the treatment of growth failure due to a lack of adequate endogenous growth hormone, but hGH has also been used to treat short children who are not classically GH-deficient such as girls with Turner's syndrome; prepubertal children with chronic renal insufficiency and severe growth retardation; and children with non-GH deficient short stature.
- the production of GH by genetic engineering is very expensive for clinical use. In particular, there are risks of contamination of these commercial preparations with material from the bacterial strain used. These bacterial contaminants may be pyrogens or may result in immunogenic reactions in patients.
- the purification of the recombinant product is carried out by following a plurality of successive chromatography steps. The drastic purity criteria imposed by regulatory agencies necessitate multiple quality control steps. US Patent 6458764.
- the assay means may be any conventional means which will indicate the quantitative amount of hGH present in a blood sample drawn from the patient.
- the concentration of GH in serum is determined using standard radioimmunoassay ("RIA") procedures as set forth in e.g., Miles I. E. M. et al., Lancet ii, 492-493 (1968) or O'Dell W et al., J.Lab.Clin.Med. 70, 973-80 (1967).
- the test is used as follows. First, the GH-RH dose is administered. Thirty minutes later, a blood sample is taken for RIA of GH. Various commercially available kits (e.g., Nichols Institute of Diagnostics, San Juan Capistrano, Calif.) or reference preparations of hGH (e.g., NIAMDD-hGH-RP-1 ) can be used for RIA of GH. After waiting 6-24 hours for the effect of GH-RH to wear off, the dose of the synthetic peptide GH-RH analog is administered. Blood again is drawn for radioimmunoassay of GH. [0070].
- kits e.g., Nichols Institute of Diagnostics, San Juan Capistrano, Calif.
- reference preparations of hGH e.g., NIAMDD-hGH-RP-1
- Glucocorticoids are potent inhibitors of linear growth in man and growth suppression is a well known risk of long term treatment of asthmatic children with steroids. Thus stunted growth is an important consequence of chronic administration of glucocorticoids in childhood.
- the inhibition of GH secretion is due in some extent to the fact that chronic administration of glucocorticoids suppresses GHRH. This inhibition occurs at the level of the hypothalamus or above and in this situation only the treatment with GH-RH agonists will stimulate linear growth.
- Growth hormone tends to decline with the aging process and may lead to decrease in muscle mass and adiposity.
- daily GH-RH injection to menopausal women, for 8 days augments GH responses and IGF-I levels and raises serum osteocalcin levels.
- the therapy with GH-RH agonistic analogs reduces the loss of muscle, bone and skin mass and lessen the increase of body fat that normally accompanies the aging process.
- Growth hormone is a potent anabolic hormone that enhances protein synthesis and nitrogen retention.
- Chronic administration of agonistic analogs of GH- RH increases the endogenous growth hormone secretion.
- the therapy with GH-RH agonistic analogs has uses in other areas of medicine such as catabolic states causing accelerated weight loss; tissue repair in patients with severe body surface burn, accelerating healing of nonunion fractures; and in some cases of cardiac failure.
- GH-RH GH-deficient children respond to GH-RH(1 -40), GH-RH(1 -29) or GH-RH(1 -44), with an increase in growth. Thorner M. O. et al., supra; Ross et al., supra; Takano K et al., supra; and Kirk et al., supra. Most children who respond to hGH, will respond to GH- RH. This is because most GH-deficient children have a hypothalamic defect in GH release, and will show a GH response after the administration of analogs of the hypothalamic hormone GH-RH.
- GH-RH(1 -29)NH.sub.2 given subcutaneously twice a day promoted linear growth in approximately 50% of a group of GH-deficient children (Ross et al, cited above). A small group of severely GH-deficient children will respond to GH-RH after 6 (six) months of treatment.
- Geriatric Patients To reduce the loss of muscle, bone and skin mass and lessen the increase of body fat that normally accompanies the aging process.
- GH-RH agonists could be used during and after space flights to counteract the decrease in GH secretion. Weightlessness of space flight significantly decreases the release of growth hormone, which could explain the bone loss and muscle weakness many astronauts experience after prolonged space flights.
- the invention further comprises a method of treating human growth hormone deficiency comprising administering from 0.01 .mu.g to 2 .mu.g of a peptide per day per kg body weight.
- the synthetic peptides may be formulated in a pharmaceutical dosage form with an excipient and administered to humans or animals for therapeutic or diagnostic purposes. More particularly, the synthetic peptides may be used to promote the growth of warm-blooded animals, as, in humans, to treat human growth deficiency by stimulating in vivo synthesis and/or release of endogenous GH; to treat certain physiological conditions such as severe growth retardation due to chronic renal in-sufficiency; to offset certain effects of aging, e.g., reducing loss of muscle and bone loss; to accelerate healing and tissue repair; to improve feed utilization, thereby increasing lean/fat ratio favoring muscle gain at the cost of fat; and also to enhance milk production in lactating cattle. Further, the synthetic peptides may be used in a method to ascertain endogenous physiological ability to produce hGH.
- the synthesis is conducted in a stepwise manner using manual solid phase peptide synthesis equipment. Two methods have been used for the synthesis of peptides having Agm at the C-terminus.
- the starting material of the synthesis is Boc-agmatine-N G -sulfonyl-phenoxyacetyl-MBHA (Boc-Agm-SPA-MBHA) resin with a substitution of 0.3 mmol/g, which was obtained commercially from California Peptide Research, Inc. (Napa, CA).
- the synthesis of this resin has been described in U.S. Pat. No.
- Boc-Agm-SPA-MBHA resin (1 .67 g, 0.50 mmol) is pre-swollen in DCM and then the deprotection and neutralization protocols described in Table 2 are performed in order to remove the Boc protecting group and prepare the peptide-resin for coupling of the next amino acid.
- Agm-sulfonyl-polystyrene (PS) resin is used [1 % DVB, 100-200 mesh, 0.74 mmol/g, American Peptide Company (Sunnyvale, CA)]. Briefly, Agm-sulfonyl-PS resin (680 mg, 0.50 mmol) is neutralized with 5% DIEA in DCM and washed according to the protocol described in Table 2. The solution of Boc-Asp(OcHx)-OH (475 mg, 1 .5 mmol) in DMF-DCM (1 :1 ) is shaken with the neutralized resin and DIC (235 ⁇ , 1 .5 mmol) in a manual solid phase peptide synthesis apparatus for 1 hour.
- PS Agm-sulfonyl-polystyrene
- the crude peptide is checked by analytical HPLC using a Hewlett-Packard Model HP-1090 liquid chromatograph equipped with a Supelco Discovery HS C18 reversed-phase column (2.1 mm x 5 cm, packed with C18 silica gel, 300 A pore size, 3 ⁇ particle size) (Supeico, Bellefonte, PA).
- Linear gradient elution e.g., 40-70% B
- a solvent system consisting of (A) 0.1 % aqueous TFA and (B) 0.1 % TFA in 70% aqueous MeCN, and the flow rate is 0.2 mL/min.
- the column is eluted with a solvent system described above in a linear gradient mode (e.g., 40-60% B in 120 min); flow rate 12 mL/min.
- the eluent is monitored at 220 nm, and fractions are examined by analytical HPLC. Fractions with purity higher than 95% are pooled and lyophilized to give 18 mg pure product.
- the analytical HPLC is carried out on a Supeico Discovery C18 reversed-phase column described above using isocratic elution with a solvent system described above with a flow rate of 0.2 mL/min. The peaks are monitored at 220 and 280 nm. The product is judged to be substantially (>95%) pure by analytical HPLC. Molecular mass is checked by electrospray mass spectrometry, and the expected amino acid composition is confirmed by amino acid analysis.
- the purified compounds are judged to be substantially (>95%) pure by analytical HPLC. Their molecular masses are checked by electrospray mass spectrometry, and the expected amino acid compositions are confirmed by amino acid analysis. EX
- the synthesis is conducted in a stepwise manner using manual solid phase peptide synthesis equipment. Briefly, para-methylbenzhydrylamine (MBHA) resin (100-200 mesh, 1 % DVB, 0.7 mmol/g, Advanced Chemtech, Louisville, KY) (350 mg, 0.50 mmol) is neutralized with 5% DIEA in DCM and washed according to the protocol described in Table 2. The solution of Boc-Amc-OH (390 mg, 1 .5 mmol) in DMF-DCM (1 :1 ) is shaken with the neutralized MBHA resin and DIC (235 ⁇ , 1 .5 mmol) in a manual solid phase peptide synthesis apparatus for 1 hour.
- MBHA para-methylbenzhydrylamine
- the suitable protecting group for the side chain functional group of particular amino acids appears in parentheses.
- the OH groups in the above formulae indicate that the carboxyl terminus of each residue is free.
- the protected amino acids (1 .5 mmol each) are coupled with DIC (235 ⁇ _, 1 .5 mmol) with the exceptions of Boc-Asn-OH and Boc- Gln-OH which are coupled with their preformed HOBt esters.
- the crude peptide is checked by analytical HPLC using a Hewlett- Packard Model HP-1090 liquid chromatograph equipped with a Supelco Discovery HS C18 reversed-phase column (2.1 mm x 5 cm, packed with C18 silica gel, 300 A pore size, 3 ⁇ particle size) (Supelco, Bellefonte, PA).
- Linear gradient elution e.g., 40-70% B
- a solvent system consisting of (A) 0.1 % aqueous TFA and (B) 0.1 % TFA in 70% aqueous MeCN, and the flow rate is 0.2 mL/min.
- the column is eluted with a solvent system described above in a linear gradient mode (e.g., 40-60% B in 120 min); flow rate 12 mL/min.
- the eluent is monitored at 220 nm, and fractions are examined by analytical HPLC. Fractions with purity higher than 95% are pooled and lyophilized to give 28 mg pure product.
- the analytical HPLC is carried out on a Supeico Discovery C18 reversed-phase column described above using isocratic elution with a solvent system described above with a flow rate of 0.2 mL/min. The peaks are monitored at 220 and 280 nm. The product is judged to be substantially (>95%) pure by analytical HPLC.
- the cleavage mixture is added dropwise to cold (preferably -20°C) ether.
- the precipitated material is collected by filtration or centrifugation and is washed three times with cold ether.
- the cleaved and deprotected peptide is dissolved in 50% acetic acid and separated from the resin by filtration. After dilution with water and lyophilization, 1 18 mg crude product is obtained. [00180].
- the crude peptide is checked by analytical HPLC using a Hewlett- Packard Model HP-1090 liquid chromatograph equipped with a Supelco Discovery HS C18 reversed-phase column (2.1 mm x 5 cm, packed with C18 silica gel, 300 A pore size, 3 ⁇ particle size) (Supelco, Bellefonte, PA).
- Linear gradient elution e.g., 40-70% B
- a solvent system consisting of (A) 0.1 % aqueous TFA and (B) 0.1 % TFA in 70% aqueous MeCN, and the flow rate is 0.2 mL/min.
- the column is eluted with a solvent system described above in a linear gradient mode (e.g., 40-60% B in 120 min); flow rate 12 mL/min.
- the eluent is monitored at 220 nm, and fractions are examined by analytical HPLC. Fractions with purity higher than 95% are pooled and lyophilized to give 19 mg pure product.
- the analytical HPLC is carried out on a Supelco Discovery C18 reversed-phase column described above using isocratic elution with a solvent system described above with a flow rate of 0.2 mL/min. The peaks are monitored at 220 and 280 nm. The product is judged to be substantially (>95%) pure by analytical HPLC. Molecular mass is checked by electrospray mass spectrometry, and the expected amino acid composition is confirmed by amino acid analysis.
- Peptide 27401 , Peptide 27403, Peptide 27404, Peptide 27405, Peptide 27406, Peptide 27407, Peptide 27408, Peptide 27409, Peptide 27410, Peptide 2741 1 , Peptide 412, Peptide 27413, Peptide 27414, Peptide 27415, Peptide 27416, Peptide 27417, Peptide 27418, Peptide 27419, Peptide 27422, Peptide 27423, Peptide 27424, Peptide 27425, Peptide 27440, Peptide 27441 , Peptide 27442, Peptide 27443, Peptide 27444, Peptide 27445, Peptide 27446, Peptide 27447, Peptide 27448, Peptide 27449, Peptide 27450, Peptide 27451 are synthesized in the same manner as Peptide 27400, except that these peptides also contain
- the synthesis is conducted in a stepwise manner using manual solid phase peptide synthesis equipment. Briefly, 3-[(Ethyl-Fmoc-amino)methyl]-indol-1 -yl]-acetyl AM resin (Nova Biochem, La Jolla, CA) (610 mg, 0.50 mmol) is deprotected with 20% piperidine in DMF for 5 and 15 minutes and washed according to the protocol described in Table 3. The solution of Fmoc-Arg(Pbf)-OH (975 mg, 1 .5 mmol) in DMF is shaken with the washed resin and DIC (235 ⁇ , 1 .5 mmol) in a manual solid phase peptide synthesis apparatus for 1 hour.
- cleavage cocktail (94% TFA, 3% H 2 0, 1 .5% m-cresol, and 1 .5% phenol) at room temperature for 3 hours.
- the cleavage mixture is added dropwise to cold (preferably -20°C) ether.
- the precipitated material is collected by filtration or centrifugation and is washed three times with cold ether.
- the cleaved and deprotected peptide is dissolved in 50% acetic acid and separated from the resin by filtration. After dilution with water and lyophilization, 1 10 mg crude product is obtained.
- the crude peptide is checked by analytical HPLC using a Hewlett- Packard Model HP-1090 liquid chromatograph equipped with a Supeico Discovery HS C18 reversed-phase column (2.1 mm x 5 cm, packed with C18 silica gel, 300 A pore size, 3 ⁇ particle size) (Supeico, Bellefonte, PA).
- Linear gradient elution e.g., 40-70% B
- a solvent system consisting of (A) 0.1 % aqueous TFA and (B) 0.1 % TFA in 70% aqueous MeCN, and the flow rate is 0.2 mL/min.
- the column is eluted with a solvent system described above in a linear gradient mode (e.g., 40-60% B in 120 min); flow rate 12 mL/min.
- the eluent is monitored at 220 nm, and fractions are examined by analytical HPLC. Fractions with purity higher than 95% are pooled and lyophilized to give 16 mg pure product.
- the analytical HPLC is carried out on a Supeico Discovery C18 reversed-phase column described above using isocratic elution with a solvent system described above with a flow rate of 0.2 mL/min. The peaks are monitored at 220 and 280 nm. The product is judged to be substantially (>95%) pure by analytical HPLC. Molecular mass is checked by electrospray mass spectrometry, and the expected amino acid composition is confirmed by amino acid analysis.
- Peptide 28421 , Peptide 28430, Peptide 28431 , Peptide 28460, Peptide 28461 , Peptide 28462, Peptide 28463, Peptide 28464, Peptide 28465, Peptide 28466, Peptide 28467, Peptide 28468, Peptide 28469, Peptide 28470, Peptide 28471 , Peptide 28472, Peptide 28473, Peptide 28474, Peptide 28475, Peptide 28476, Peptide 28477, Peptide 28478, Peptide 28479 are synthesized in the same manner as Peptide 28460, except that these peptides also contain other amino acid substitutions in the peptide sequence. The details for these syntheses are set forth below.
- the purified compounds are judged to be substantially (>95%) pure by analytical HPLC. Their molecular masses are checked by electrospray mass spectrometry, and the expected amino acid compositions are confirmed by amino acid analysis
- the synthesis is conducted in a stepwise manner using manual solid phase peptide synthesis equipment. Briefly, para-methylbenzhydrylamine (MBHA) resin (Bachem, King of Prussia, PA) (720 mg, 0.50 mmol) is pre-swollenin DCM and neutralized with 5% DIEA in DCM and washed according to the protocol described in Table I. The solution of Boc-Gab-OH (265 mg, 1 .5 mmol) in DMF-DCM (1 :1 ) is shaken with the neutralized resin and DIC (235 ⁇ , 1 .5 mmol) in a manual solid phase peptide synthesis apparatus for 1 hour.
- MBHA para-methylbenzhydrylamine
- the crude peptide is checked by analytical HPLC using a Hewlett-Packard Model HP-1090 liquid chromatograph equipped with a Supelco Discovery HS C18 reversed-phase column (2.1 mm x 5 cm, packed with C18 silica gel, 300 A pore size, 3 ⁇ particle size) (Supelco, Bellefonte, PA).
- Linear gradient elution e.g., 40-70% B
- a solvent system consisting of (A) 0.1 % aqueous TFA and (B) 0.1 % TFA in 70% aqueous MeCN, and the flow rate is 0.2 mL/min.
- the column is eluted with a solvent system described above in a linear gradient mode (e.g., 40-60% B in 1 20 min); flow rate 12 mL/min.
- the eluent is monitored at 220 nm, and fractions are examined by analytical HPLC. Fractions with purity higher than 95% are pooled and lyophilized to give 27 mg pure product.
- the analytical HPLC is carried out on a Supelco Discovery C18 reversed-phase column described above using isocratic elution with a solvent system described above with a flow rate of 0.2 mL/min. The peaks are monitored at 220 and 280 nm. The product is judged to be substantially (>95%) pure by analytical HPLC. Molecular mass is checked by electrospray mass spectrometry, and the expected amino acid composition is confirmed by amino acid analysis.
- Peptide 29701 Peptide 29703, Peptide 29704, Peptide 29706, Peptide 29708, Peptide 2971 0, Peptide 29720, Peptide 29721 , Peptide 29722, Peptide 29723, Peptide 29724 are synthesized in the same manner as Peptide 29702, except that these peptides also contain other amino acid substitutions in the peptide sequence, and acyl moieties at their N-termini. The details for these syntheses are set forth below. [00252].
- HF cleavage and deprotection, and subsequent purification by semipreparative HPLC of Peptide 29701 , Peptide 29703, Peptide 29704, Peptide 29706, Peptide 29708, Peptide 29710, Peptide 29720, Peptide 29721 , Peptide 29722, Peptide 29723, Peptide 29724 are doneas described in the case of Peptide 21300.
- the purified compounds are judged to be substantially (>95%) pure by analytical HPLC. Their molecular masses are checked by electrospray mass spectrometry, and the expected amino acid compositions are confirmed by amino acid analysis.
- the aluminum monostearate is combined with the sesame oil and heated to 125 Q C with stirring until a clear yellow solution forms. This mixture is then autoclaved for sterility and allowed to cool.
- the GH-RH antagonist Peptide 1 1604 is then added aseptically with trituration.
- Particularly preferred antagonists are salts of low solubility, e.g., pamoate salts and the like. These exhibit long duration of activity.
- Microcapsules are made from the following:
- Ligand competition assay with 25 l-labeled [His 1 , Nle 27 ]hGH-RH(1 -32)-NH 2 was used to determine the binding affinities of the novel hGH-RH agonists to membrane receptors of rat anterior pituitary cells. The methods used have been described in detail (Halmos G, et al. Receptor 3: 87-97, 1993), here by incorporated by reference. Brifly, radioidonated [His 1 , Nle 27 ]hGH-RH(1 -32)-NH 2 is prepared by the chloramines-T method.
- GHRH agonists were performed as previously described, by using a sensitive in vitro ligand competition assay based on binding of 25 l-labeled JV-1 -42 to human pituitary membrane homogenates. Normal human pituitaries were purchased from the National Hormone and Peptide Program (A.F. Parlow, Los Angeles, County Harbor -
- IC 50 values of the best agonists were in the 0.04 - 0.09 nM range. Based on the receptor binding results all new GHRH agonists exceeded the binding affinity of reference peptides JI-34, J 1-36 and JI-38. Some of these new GHRH agonists showed the highest GHRH receptor binding affinity, their IC 50 values being 21 -48 times lower than that of the GHRH agonist JI-38.
- the new analogs Following intravenous administration, the new analogs give growth hormone levels greater than those from hGH-RH(1 -29)NH 2 or JI-38. The effect is longer lasting which indicates that the analogs have not only higher receptor affinity but also increased peptidase resistance.
- the most potent analogs i.v. were P-27403 and P- 25502.
- the analogs Following subcutaneous administration, the analogs give that greater growth hormone levels than hGH-RH or JI-38.
- the analogs P-22326, P-20350, P- 20356, P-27403, P-27404, P-27409, P-25501 , P-25502 produce unusually high responses.
- Results of i.v. and s.c. administration results show different biological activity pattern.
- Analogs given i.v. are subject to degredation in the blood streatm.
- Analogs given s.c. can be degraded by peptidase at the site of injection. It is believed that activity depends primarily on binding capacity of the peptide to its receptor, and from favorable transport properties, suitable binding to plasma proteins and metabolic stability.
- the above findings therefore indicate that the analogs showing better activity when given subcutaneously are resistant to local degradation at the injection site and they may also be less susceptible to enzyme degradation in the blood stream and/or have more affinity for GH-RH receptors than hGH-RH(1 - 29)NH 2 .
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Priority Applications (8)
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EP12860298.4A EP2794647B1 (en) | 2011-12-21 | 2012-12-04 | Novel gh-rh analogs with potent agonistic effects |
CN201280070383.9A CN104520314B (en) | 2011-12-21 | 2012-12-04 | The new GH-RH analog with potent exciting effect |
MX2014007402A MX353869B (en) | 2011-12-21 | 2012-12-04 | Novel gh-rh analogs with potent agonistic effects. |
KR1020147020457A KR102117216B1 (en) | 2011-12-21 | 2012-12-04 | Novel gh-rh analogs with potent agonistic effects |
JP2014549075A JP6375089B2 (en) | 2011-12-21 | 2012-12-04 | Novel GH-RH analogs with potent agonist activity |
AU2012355743A AU2012355743B2 (en) | 2011-12-21 | 2012-12-04 | Novel GH-RH analogs with potent agonistic effects |
CA2859675A CA2859675C (en) | 2011-12-21 | 2012-12-04 | Novel gh-rh analogs with potent agonistic effects |
IL233186A IL233186B (en) | 2011-12-21 | 2014-06-17 | Novel gh-rh analogs with potent agonistic effects |
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US13/332,624 US9079974B2 (en) | 2011-12-21 | 2011-12-21 | GH-RH analogs with potent agonistic effects |
US13/332,624 | 2011-12-21 |
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KR (1) | KR102117216B1 (en) |
CN (1) | CN104520314B (en) |
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Cited By (3)
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WO2014100809A2 (en) | 2012-12-21 | 2014-06-26 | University Of Miami | Ghrh agonists for the treatment of ischemic disorders |
WO2014100816A2 (en) | 2012-12-21 | 2014-06-26 | University Of Miami | Ghrh agonists for islet cell transplantation and function and the treatment of diabetes |
JP2017514848A (en) * | 2014-05-06 | 2017-06-08 | レ ラボラトワール セルヴィエ | Novel ivabradine salt and preparation method thereof |
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US9079974B2 (en) * | 2011-12-21 | 2015-07-14 | The University Of Miami | GH-RH analogs with potent agonistic effects |
JP7134093B2 (en) | 2016-04-19 | 2022-09-09 | グリフォン・ファーマシューティカルズ・アンテルナシオナル・エスアー | Pegylated bioactive peptides and uses thereof |
CN107320718B (en) * | 2017-05-23 | 2020-12-11 | 余红 | Application of somatotropin releasing hormone agonist in preparing anti-vascular calcification medicine |
CN111407884B (en) * | 2019-06-24 | 2021-12-07 | 浙江大学 | Application of somatotropin releasing hormone agonist GHRH-A in preparation of anti-aging drugs |
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- 2012-12-04 JP JP2014549075A patent/JP6375089B2/en not_active Expired - Fee Related
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WO2014100809A2 (en) | 2012-12-21 | 2014-06-26 | University Of Miami | Ghrh agonists for the treatment of ischemic disorders |
WO2014100816A2 (en) | 2012-12-21 | 2014-06-26 | University Of Miami | Ghrh agonists for islet cell transplantation and function and the treatment of diabetes |
WO2014100816A3 (en) * | 2012-12-21 | 2014-10-09 | University Of Miami | Ghrh agonists for islet cell transplantation and function and the treatment of diabetes |
EP2935317A4 (en) * | 2012-12-21 | 2016-06-22 | Univ Miami | Ghrh agonists for islet cell transplantation and function and the treatment of diabetes |
EP2934565A4 (en) * | 2012-12-21 | 2016-06-22 | Univ Miami | Ghrh agonists for the treatment of ischemic disorders |
US9393271B2 (en) | 2012-12-21 | 2016-07-19 | University Of Miami | GHRH agonists for islet cell transplantation and function and the treatment of diabetes |
US10555987B2 (en) | 2012-12-21 | 2020-02-11 | University Of Miami | GHRH agonists for the treatment of ischemic disorders |
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KR20150005904A (en) | 2015-01-15 |
AU2012355743B2 (en) | 2017-09-14 |
MX353869B (en) | 2018-02-01 |
IL233186B (en) | 2019-05-30 |
IL233186A0 (en) | 2014-07-31 |
EP2794647A1 (en) | 2014-10-29 |
US9079974B2 (en) | 2015-07-14 |
CN104520314A (en) | 2015-04-15 |
KR102117216B1 (en) | 2020-06-02 |
EP2794647A4 (en) | 2015-10-28 |
MX2014007402A (en) | 2014-10-06 |
EP2794647B1 (en) | 2019-03-27 |
AU2012355743A1 (en) | 2014-07-03 |
JP6375089B2 (en) | 2018-08-15 |
JP2015503512A (en) | 2015-02-02 |
CA2859675C (en) | 2021-07-20 |
US20150274798A1 (en) | 2015-10-01 |
CN104520314B (en) | 2016-06-15 |
US20140058068A1 (en) | 2014-02-27 |
CA2859675A1 (en) | 2013-06-27 |
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