US20150209367A1 - Treating Hearing Loss - Google Patents

Treating Hearing Loss Download PDF

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US20150209367A1
US20150209367A1 US14/426,629 US201314426629A US2015209367A1 US 20150209367 A1 US20150209367 A1 US 20150209367A1 US 201314426629 A US201314426629 A US 201314426629A US 2015209367 A1 US2015209367 A1 US 2015209367A1
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cells
methyl
hair
hearing
cell
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Albert Edge
Hideyuki Okano
Masato Fujioka
Kunio Mizutari
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Massachusetts Eye and Ear
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Massachusetts Eye and Ear Infirmary
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Assigned to MASSACHUSETTS EYE & EAR INFIRMARY reassignment MASSACHUSETTS EYE & EAR INFIRMARY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUJIOKA, MASATO, OKANO, HIDEYUKI, MIZUTARI, Kunio, EDGE, ALBERT
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/55—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having seven-membered rings, e.g. azelastine, pentylenetetrazole
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/06—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
    • A61K47/08—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing oxygen, e.g. ethers, acetals, ketones, quinones, aldehydes, peroxides
    • A61K47/10—Alcohols; Phenols; Salts thereof, e.g. glycerol; Polyethylene glycols [PEG]; Poloxamers; PEG/POE alkyl ethers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/30—Macromolecular organic or inorganic compounds, e.g. inorganic polyphosphates
    • A61K47/34—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyesters, polyamino acids, polysiloxanes, polyphosphazines, copolymers of polyalkylene glycol or poloxamers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/0012—Galenical forms characterised by the site of application
    • A61K9/0046—Ear
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P27/00—Drugs for disorders of the senses
    • A61P27/16—Otologicals

Definitions

  • This invention relates to methods for treating hearing loss associated with loss of cochlear hair cells, e.g., caused by noise exposure, in post neonatal animals, e.g., adolescent or adult animals, using certain Notch inhibitors, e.g., gamma secretase inhibitors.
  • Notch inhibitors e.g., gamma secretase inhibitors.
  • the cochlear sensory epithelium contains hair cells adapted for the detection of sound, which is transduced by stereocilia at their apical surfaces (1, 2). Hair cells produced during development are post-mitotic and are not replaced after loss (3-6) or as part of normal cell turnover in mammals (7-9). As a result, deafness due to hair cell loss is irreversible. Hair cell development during the embryonic period includes a complex series of fate decisions, in which prosensory epithelial cells acquire different fates, either hair cell or supporting cell, through a process of lateral inhibition which is mediated by Notch signaling (5, 10, 11). Supporting cells are prevented from differentiating into hair cells by active Notch signaling stimulated by ligands on adjacent hair cells. This active Notch signaling ends shortly after birth, given the loss of an effect of ⁇ -secretase inhibitors on hair cell number in the early postnatal period (13) and other data suggesting that Notch signaling is extinguished after birth (14).
  • the present invention is based on the discovery that blocking Notch signaling with certain gamma-secretase inhibitors resulted in regeneration of cochlear hair cells in adult animals that correlated with recovery of hearing after noise-induced hearing loss.
  • the invention features methods for treating hearing loss caused by loss of cochlear hair cells in a post-neonatal mammal.
  • the methods include systemically or locally administering to the ear of the mammal a composition comprising a therapeutically effective amount of a Notch inhibitor, e.g., a gamma secretase inhibitor, wherein the therapeutically effective amount is an amount sufficient to restore hearing at one or more frequencies.
  • a Notch inhibitor e.g., a gamma secretase inhibitor
  • the hearing loss was caused by exposure to a physical or chemical ototoxic insult, e.g., repeated (chronic) exposure or one or more acute exposures.
  • a physical or chemical ototoxic insult e.g., repeated (chronic) exposure or one or more acute exposures.
  • the physical ototoxic insult is noise.
  • the composition is administered to the ear within four weeks, two weeks, one week, or one day of the exposure to the insult.
  • the composition is applied topically to the round window.
  • the composition further comprises a carrier, e.g., a sustained release carrier.
  • a carrier e.g., a sustained release carrier.
  • the carrier is a polyoxyethylene-polyoxypropylene triblock copolymer.
  • the composition comprises at least 10 mM of the Notch inhibitor.
  • the methods further include determining a baseline level of hearing at one or more frequencies before administering the composition, and a subsequent level of hearing at the same one or more frequencies after administering the composition, and administering one or more additional doses of the composition until a desired level of hearing at the one or more frequencies is recovered.
  • the subsequent level of hearing is determined one week, two weeks, three weeks, one month, two months, three months, four months, six months, and/or twelve months after administering the composition.
  • the gamma secretase inhibitor is selected from the group consisting of RO4929097; DAPT (N-[(3,5-Difluorophenyl)acetyl]-L-alanyl-2-phenyl]glycine-1,1-dimethylethyl ester); L-685458 ((5S)-(t-Butoxycarbonylamino)-6-phenyl-(4R)hydroxy-(2R)benzylhexanoyl)-L-leu-L-phe-amide); BMS-708163 (Avagacestat); BMS-299897 (2-[(1R)-1-[[(4-Chlorophenyl)sulfonyl](2,5-difluorophenyl)amino]ethyl-5-fluorobenzenebutanoic acid); MK-0752; YO-01027; MDL28170 (Sigma); LY411575 (N-2-[(3,
  • the gamma secretase inhibitor is LY411575 (N-2((2S)-2-(3,5-difluorophenyl)-2-hydroxyethanoyl)-N1-((7S)-5-methyl-6-oxo-6,7-dihydro-5H-dibenzo[b,d]azepin-7-yl)-1-alaninamide).
  • the post-neonatal mammal is a child, adolescent or adult, e.g., above the age of 6 months, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or 13 years.
  • the mammal is an adult of at least 40 years of age, e.g., at least 45, 50, 55, 60, 65, 70 years of age.
  • the mammal is a human.
  • FIGS. 1A-D In vitro activity of ⁇ -secretase inhibitors in hair cell induction
  • FIGS. 2A-D Hair cell replacement after LY411575 treatment of organ of Corti explants from mice subjected to ablation of hair cells
  • FIGS. 3A-B Time course of Hes5 and Atoh1 mRNA expression in the cochlea with or without LY411575 after noise exposure
  • FIGS. 4A-G Lineage tracing of supporting cells in noise-exposed cochleae treated in vivo with a ⁇ -secretase inhibitor
  • Double-labeled cells (arrowheads) positive for Sox2 lineage (GFP) and myosin VIIa (blue) were observed in the outer hair cell area (white bracket) in cochlear tissues from deafened mice carrying the Sox2-CreER as well as the Cre reporter transgene, mT/mG, 1 month after LY411575 treatment.
  • Hair cell co-labeling with the lineage tag indicates derivation from a Sox2-positive cell and is thus evidence for regenerated hair cells after deafening in the mature mouse cochlea by transdifferentiation of supporting cells.
  • These confocal xy-projection images of LY411575-treated ears from Sox2-CreER; mT/mG double transgenic mice are in the 8 kHz area of the cochlear longitudinal frequency map.
  • FIGS. 5A-B Hair cells in damaged mature cochlea treated with LY411575 in vivo
  • FIGS. 6A-E Measurement of ABR in deafened ears after LY411575 treatment
  • 1 d after noise exposure Post Noise: filled circles
  • 1 week after drug treatment (1 W: open squares
  • 1 Mo: crosses 1 month after treatment
  • 3 Mo: filled triangles 3 Mo: filled triangles
  • FIGS. 7A-C Cochlear architecture in a mouse exposed to 8-16 kHz octave-band noise at 116 dB SPL for 2 h
  • Scale bar is 500 ⁇ m.
  • FIGS. 8A-B Analysis of the effect in vivo on the brainstem response and hair cell morphology of LY411575 administered systemically to young adult noise-damaged mice
  • Asterisks indicate p ⁇ 0.05. Scale bars are 50 ⁇ m.
  • FIG. 9 Labeling of a mature mouse cochlea with the reporter strain
  • Sox2-CreER mouse crossed to the reporter line, mT/mG, treated with tamoxifen at P1 was examined as a whole mount after dissection. Any cells that express Sox2 at P1 would be expected to be GFP-positive after removal of the STOP sequence, whereas cells that do not will retain the tomato label. Supporting cells from the 5 to the 45 kHz regions are labeled by GFP from the Sox2-Cre reporter (Sox2-lineage; green). In contrast, myosin VIIa-labeled hair cells (blue) display td-Tomato labeling (td-Tomato; red), and this pattern is retained from the 5 to the 45 kHz region (see bundles in the merged image; Merge). Note that some pillar cells are not labeled by the GFP from the reporter (22.6 kHz for example), presumably due to incomplete Cre activity.
  • Scale bar is 50 ⁇ m.
  • FIG. 10 Structures of Gamma-Secretase Inhibitors.
  • DAPT N-[(3,5-Difluorophenyl)acetyl]-L-alanyl-2-phenyl]glycine-1,1-dimethylethyl ester
  • L-685458 ((5S)-(t-Butoxycarbonylamino)-6-phenyl-(4R)hydroxy-(2R)benzylhexanoyl)-L-leu-L-phe-amide
  • BMS-708163 Avagacestat
  • MK-0752; YO-01027; MDL28170 Sigma
  • LY411575 N-2((2S)-2-(3,5-difluorophenyl)-2-hydroxyethanoyl)-N1-((7S)-5-methyl-6-oxo-6,7-dihydro-5H-dibenzo[b,d]azepin-7-yl)-1-alaninamide
  • Semagacestat LY450139; (2S)
  • Tight junctions are required for maintaining the ionic milieu of endolymph that bathes the surface of hair cells, and the flexibility and spacing of outer hair cells has an impact on the function of the cochlear amplifier, which is achieved by outer hair cell contraction, and together with sound detection by the transduction apparatus of inner hair cells, accounts for the sensitivity and broad dynamic range of mammalian hearing (1, 30, 31).
  • the present inventors had recently shown that inhibition of Notch increased hair cell differentiation from stem cells and that the mechanism was dependent on Atoh1, since silencing the transcription factor in the ⁇ -secretase inhibitor-treated stem cells prevented the induction of hair cell fate (15).
  • inner ear stem cells were used to select a potent ⁇ -secretase inhibitor.
  • the Notch pathway was targeted, as a strategy that would only be effective on cells that were actively signaling through Notch.
  • the supporting cells express stem cell markers such as Sox2, Musashi1, and GLAST (34-36) and have the capacity for proliferation and transdifferentiation for a short period postnatally (26). Capacity for neurosphere formation by the sensory epithelial cells in the cochlea is found in a similar postnatal time frame (37).
  • Drug therapy for restoration of hair cells is a new approach and delivery to the inner ear fluids without actual injection into the cochlea may be an advantage over gene therapy and may also effectively restrict hair cell differentiation to cells in the sensory epithelial area as compared to gene therapy that may convert hair cells in a broader area.
  • a middle ear approach was used for the delivery of LY411575 to the damaged inner ear; surprisingly, this route allowed delivery of a sufficient dose to have a therapeutic effect. Since the round window membrane consists of cell layers, lipid solubility of the drug favors permeability (23, 24).
  • Novel approaches using inner ear stem cells and transgenic mice were critical for the present demonstration that hair cells could regenerate in the mouse.
  • the caspase-3 mouse provided a model in which hair cells could be selectively deleted without damage to other cells so that new hair cells could be accurately quantified.
  • Lineage tracing with the mT/mG; Sox2-CreER double transgenic mouse allowed the unambiguous demonstration that drug treatment resulted in the generation of new hair cells and not recovery of hair cell bundles that could have accounted for recovery in the absence of lineage tracing.
  • Improved thresholds were found by ABR, showing that hearing was improved by ⁇ -secretase inhibitor administration in the acute damage situation. Hair cell counts showed an increase in the same frequency regions as the improved ABR.
  • the frequency specificity of the improved hearing was used to determine the correlation between the gain in hair cell number and the improved hearing threshold.
  • the damage in the acute noise exposure model reflected hair cell loss in humans, most severe in the base and restricted primarily to the outer hair cells (22).
  • the improvement in threshold at the apex of the cochlea was thought to result from an increase in the number of hair cells to a level that produced a detectable change through outer hair cell activity.
  • the number of hair cells at the base was not adequate to lower the threshold of the ABR, and the increase in hair cells in the apex could not be detected by a change in DPOAE threshold.
  • the combined physiological and cellular evidence allowed a definitive proof of the regeneration of hair cells that was quantitative, was correlated to frequency, and provided unequivocal evidence as to the genesis of the hair cells by lineage tracing from supporting cells.
  • the compounds and methods described herein are appropriate for the treatment of post-neonatal (e.g., child, adolescent or adult, e.g., above the age of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or 13 years) mammalian (e.g., human) subjects who have or are at risk of developing hearing disorders resulting from cochlear hair cell loss.
  • the methods described herein can be used to treat cochlear hair cell loss and any disorder that arises as a consequence of hair cell loss in the ear, such as hearing impairments or deafness.
  • These subjects can receive treatment with an agent described herein.
  • the approach may be optimal for treatment of acute hearing loss shortly after the damage has occurred, and may be less effective after longer time periods when Notch signaling has returned to its baseline level in the adult.
  • the methods include steps of selecting a patient at risk of cochlear hair cell loss and/or a patient with cochlear hair cell loss.
  • the methods include steps of selecting a patient at risk of hair cell loss and/or a patient with cochlear hair cell loss.
  • any human experiencing or at risk for developing cochlear hair cell loss is a candidate for the treatment methods described herein.
  • a human having or at risk for developing cochlear hair cell loss can hear less well than the average human being, or less well than a human before experiencing the hair cell loss. For example, hearing can be diminished by at least 5, 10, 30, 50% or more.
  • the subject can have hearing loss associated with cochlear hair cell loss for any reason, or as a result of any type of event.
  • a subject can be deaf or hard-of-hearing as a result of a physical ototoxic insult, e.g., a traumatic event, such as a physical trauma to a structure of the ear.
  • a traumatic event such as a physical trauma to a structure of the ear.
  • the subject can have (or be at risk of developing) hearing loss as result of exposure to a sudden loud noise, or a prolonged exposure to loud noises.
  • a subject can have a hearing disorder that results from aging, e.g., presbycusis, which is generally associated with normal aging processes; see, e.g., Huang, Minn Med.
  • a subject can have tinnitus (characterized by ringing in the ears) due to loss of hair cells.
  • ototoxins include therapeutic drugs including antineoplastic agents, salicylates, quinines, and aminoglycoside antibiotics, e.g., as described further below, contaminants in foods or medicinals, and environmental or industrial pollutants.
  • the methods include administering to the subject a compound described herein within one, two, three, four, five, six, or seven days, or one, two, three, four, five, or six weeks of exposure to an ototoxic insult, e.g., a physical (noise, trauma) or chemical (ototoxin) insult that results in or could result in a loss of hair cells, and causes an increase in Notch signaling in the subject.
  • an ototoxic insult e.g., a physical (noise, trauma) or chemical (ototoxin) insult that results in or could result in a loss of hair cells, and causes an increase in Notch signaling in the subject.
  • a subject suitable for the treatment using the compounds and methods featured in the invention can include a subject having a vestibular dysfunction, including bilateral and unilateral vestibular dysfunction; the methods include administering a therapeutically effective amount of an agent described herein, e.g., by systemic administration or administration via the endolymphatic sac (ES).
  • ES endolymphatic sac
  • Vestibular dysfunction is an inner ear dysfunction characterized by symptoms that include dizziness, imbalance, vertigo, nausea, and fuzzy vision and may be accompanied by hearing problems, fatigue and changes in cognitive functioning.
  • Vestibular dysfunctions that can be treated by the methods described herein can be the result of a genetic or congenital defect; an infection, such as a viral or bacterial infection; or an injury, such as a traumatic or nontraumatic injury, that results in a loss of vestibular hair cells.
  • balance disorders or Meniere's disease idiopathic endolymphatic hydrops
  • Vestibular dysfunction is most commonly tested by measuring individual symptoms of the disorder (e.g., vertigo, nausea, and fuzzy vision).
  • the compounds and methods featured in the invention can be used prophylactically, such as to prevent, reduce or delay progression of hearing loss, deafness, or other auditory disorders associated with loss of hair cells.
  • a composition containing one or more compounds can be administered with (e.g., before, after or concurrently with) an ototoxic therapy, i.e., a therapeutic that has a risk of hair cell toxicity and thus a risk of causing a hearing disorder.
  • Ototoxic drugs include the antibiotics neomycin, kanamycin, amikacin, viomycin, gentamycin, tobramycin, erythromycin, vancomycin, and streptomycin; chemotherapeutics such as cisplatin; nonsteroidal anti-inflammatory drugs (NSAIDs) such as choline magnesium trisalicylate, diclofenac, diflunisal, fenoprofen, flurbiprofen, ibuprofen, indomethacin, ketoprofen, meclofenamate, nabumetone, naproxen, oxaprozin, phenylbutazone, piroxicam, salsalate, sulindac, and tolmetin; diuretics; salicylates such as aspirin; and certain malaria treatments such as quinine and chloroquine.
  • NSAIDs nonsteroidal anti-inflammatory drugs
  • a subject undergoing chemotherapy can be treated using the compounds and methods described herein.
  • the chemotherapeutic agent cisplatin for example, is known to cause hearing loss. Therefore, a composition containing one or more compounds can be administered with cisplatin therapy (e.g., before, after or concurrently with) to prevent or lessen the severity of the cisplatin side effect.
  • a composition can be administered before, after and/or simultaneously with the second therapeutic agent.
  • the two agents may be administered by different routes of administration.
  • the compounds and methods described herein can be used to generate hair cell growth in the ear and/or to increase the number of hair cells in the ear (e.g., in the inner, middle, and/or outer ear).
  • the number of hair cells in the ear can be increased about 2-, 3-, 4-, 6-, 8-, or 10-fold, or more, as compared to the number of hair cells before treatment.
  • This new hair cell growth can effectively restore or establish at least a partial improvement in the subject's ability to hear.
  • administration of an agent can improve hearing loss by about 5, 10, 15, 20, 40, 60, 80, 100% or more.
  • the subject can be tested for an improvement in hearing or in other symptoms related to inner ear disorders.
  • Methods for measuring hearing are well-known and include pure tone audiometry, air conduction, and bone conduction tests. These exams measure the limits of loudness (intensity) and pitch (frequency) that a subject can hear.
  • Hearing tests in humans include behavioral observation audiometry (for infants to seven months), visual reinforcement orientation audiometry (for children 7 months to 3 years); play audiometry for children older than 3 years; and standard audiometric tests for older children and adults, e.g., whispered speech, pure tone audiometry; tuning fork tests; brain stem auditory evoked response (BAER) testing or auditory brain stem evoked potential (ABEP) testing.
  • BAER brain stem auditory evoked response
  • ABEP auditory brain stem evoked potential
  • Oto-acoustic emission testing can be used to test the functioning of the cochlear hair cells, and electro-cochleography provides information about the functioning of the cochlea and the first part of the nerve pathway to the brain.
  • treatment can be continued with or without modification or can be stopped.
  • an “effective amount” is an amount sufficient to effect beneficial or desired therapeutic effect. This amount can be the same or different from a prophylactically effective amount, which is an amount necessary to prevent onset of disease or disease symptoms.
  • An effective amount can be administered in one or more administrations, applications or dosages.
  • a therapeutically effective amount of a therapeutic compound i.e., an effective dosage
  • the compositions can be administered one from one or more times per day to one or more times per week; including once every other day. The skilled artisan will appreciate that certain factors may influence the dosage and timing required to effectively treat a subject, including but not limited to the severity of the disease or disorder, previous treatments, the general health and/or age of the subject, and other diseases present.
  • treatment of a subject with a therapeutically effective amount of the therapeutic compounds described herein can include a single treatment or a series of treatments.
  • noise e.g., normal noises such as are associated with activities of daily life (such as lawnmowers, trucks, motorcycles, airplanes, music (e.g., from personal listening devices), sporting events, etc.), or loud noises, e.g., at concert venues, airports, and construction areas, that can cause inner ear damage and subsequent hearing loss; e.g., subjects who are subjected to high levels of environmental noise, e.g., in the home or workplace, can be treated with repeated, e.g., periodic, doses of the pharmaceutical compositions, e.g., to prevent (reduce the risk of) or delay progression or hearing loss.
  • repeated, e.g., periodic, doses of the pharmaceutical compositions e.g., to prevent (reduce the risk of) or delay progression or hearing loss.
  • Dosage, toxicity and therapeutic efficacy of the therapeutic compounds can be determined by standard pharmaceutical procedures, e.g., in cell cultures or experimental animals, e.g., for determining the LD50 (the dose lethal to 50% of the population) and the ED50 (the dose therapeutically effective in 50% of the population).
  • the dose ratio between toxic and therapeutic effects is the therapeutic index and it can be expressed as the ratio LD50/ED50.
  • Compounds that exhibit high therapeutic indices are preferred. While compounds that exhibit toxic side effects may be used, care should be taken to design a delivery system that targets such compounds to the site of affected tissue in order to minimize potential damage to uninfected cells and, thereby, reduce side effects.
  • the data obtained from cell culture assays and animal studies can be used in formulating a range of dosage for use in humans.
  • samples of the perilymph or endolymph can be obtained to evaluate pharmacokinetics and approximate an effective dosage, e.g., in animal models, e.g., after administration to the round window.
  • the dosage of such compounds lies preferably within a range of concentrations that include the ED50 with little or no toxicity. The dosage may vary within this range depending upon the dosage form employed and the route of administration utilized.
  • the therapeutically effective dose can be estimated from cell culture assays, and/or a dose may be formulated in animal models; alternatively, for those compounds that have been previously used in humans, clinically desirable concentrations can be used as a starting point. Such information can be used to more accurately determine useful doses in humans.
  • compositions that include compounds identified herein, e.g., Notch inhibitors, e.g., gamma-secretase inhibitors, as active ingredients. Also included are the pharmaceutical compositions themselves.
  • compositions include one or more notch inhibitors, e.g., gamma secretase inhibitors, e.g., RO4929097; DAPT (N-[(3,5-Difluorophenyl)acetyl]-L-alanyl-2-phenyl]glycine-1,1-dimethylethyl ester); L-685458 ((5S)-(t-Butoxycarbonylamino)-6-phenyl-(4R)hydroxy-(2R)benzylhexanoyl)-L-leu-L-phe-amide); BMS-708163 (Avagacestat); BMS-299897 (2-[(1R)-1-[[(4-Chlorophenyl)sulfonyl](2,5-difluorophenyl)amino]ethyl-5-fluorobenzenebutanoic acid); MK-0752; YO-01027; MDL28170
  • suitable gamma secretase inhibitors include: semagacestat (also known as LY450139, (2S)-2-hydroxy-3-methyl-N-[(1S)-1-methyl-2-oxo-2-[[(1S)-2,3,4,5-tetrahydro-3-methyl-2-oxo-1H-3-benzazepin-1-yl]amino]ethyl]butanamide, available from Eli Lilly; WO 02/47671 and U.S. Pat. No.
  • MK-0752 (3-(4-((4-chlorophenyl)sulfonyl)-4-(2,5-difluorophenyl)cyclohexyl)propanoic acid, available from Merck);
  • MRK-003 ((3′R,6R,9R)-5′-(2,2,2-trifluoroethyl)-2-((E)-3-(4-(trifluoromethyl)piperidin-1-yl)prop-1-en-1-yl)-5,6,7,8,9,10-hexahydrospiro[6,9-methanobenzo[8]annulene-11,3′-[1,2,5]thiadiazolidine]1′,1′-dioxide, available from Merck, Mizuma et al., Mol Cancer Ther.
  • MRK-560 N-[cis-4-[(4-Chlorophenyl)sulfonyl]-4-(2,5-difluorophenyl)cyclohexyl]-1,1,1-trifluoro-methanesulfonamide, Best et. al., J Pharmacol Exp Ther.
  • RO-4929097 also known as R4733, (S)-2,2-dimethyl-N1-(6-oxo-6,7-dihydro-5H-dibenzo[b,d]azepin-7-yl)-N3-(2,2,3,3,3-pentafluoropropyl)malonamide, available from Hoffman-La Roche Inc., Tolcher et al., J Clin. Oncol. 30(19):2348-2353, 2012); JLK6 (also known as 7-Amino-4-chloro-3-methoxyisocoumarin, available from Santa Cruz Biotechnology, Inc., Petit et al., Nat. Cell. Biol.
  • Tarenflurbil also known as (R)-Flurbiprofen, (2R)-2-(3-fluoro-4-phenylphenyl)propanoic acid
  • ALX-260-127 also known as Compound 11, described by Wolfe et al., J. Med. Chem. 41:6, 1998
  • Sulindac sulfide SSide, Takahashi et al., J Biol Chem.
  • gamma secretase inhibitor III (N-Benzyloxycarbonyl-Leu-leucinal, available from Calbiochem); gamma secretase inhibitor IV, (N-(2-Naphthoyl)-Val-phenylalaninal, available from Calbiochem); gamma-secretase inhibitor V (also known as Z-LF-CHO, N-Benzyloxycarbonyl-Leu-phenylalaninal, available from EMD Millipore); gamma-secretase inhibitor VI (1-(S)-endo-N-(1,3,3)-Trimethylbicyclo[2.2.1]hept-2-yl)-4-fluorophenyl Sulfonamide, available from EMD Millipore); gamma secretase inhibitor VII, (also known as Compound A, MOC-LL-CHO, Menthyloxycarbonyl-LL-CHO, available from Calbiochem); gamma secreta secretase inhibitor VII, (also known as Compound A,
  • gamma secretase inhibitor XIII (Z-Tyr-Ile-Leu-CHO, available from Calbiochem); gamma secretase inhibitor XIV, (Z-Cys(t-Bu)-Ile-Leu-CHO, available from Calbiochem); gamma secretase inhibitor XVII, (also known as WPE-III-31C),
  • gamma secretase inhibitor XIX also known as benzodiazepine, (2S,3R)-3-(3,4-Difluorophenyl)-2-(4-fluorophenyl)-4-hydroxy-N-((3S)-2-oxo-5-phenyl-2,3-dihydro-1H-benzo[e][1,4]diazepin-3-yl)-butyramide, Churcher et al., J Med Chem.
  • gamma secretase inhibitor XX also known as dibenzazepine, (S,S)-2-[2-(3,5-Difluorophenyl)acetylamino]-N-(5-methyl-6-oxo-6,7-dihydro-5H-dibenzo[b,d]azepin-7-yl)propionamide,
  • gamma-secretase inhibitors are disclosed in U.S. Patent Application Publication Nos. 2004/0029862, 2004/0049038, 2004/0186147, 2005/0215602, 2005/0182111, 2005/0182109, 2005/0143369, 2005/0119293, 2008/008316, and 2011/0020232, and U.S. Pat. Nos. 6,756,511; 6,890,956; 6,984,626; 7,049,296; 7,101,895; 7,138,400; 7,144,910; 7,183,303; 8,188,069; and International Publication Nos.
  • compositions typically include a pharmaceutically acceptable carrier.
  • pharmaceutically acceptable carrier includes saline, solvents, dispersion media, coatings, antibacterial and antifungal agents, isotonic and absorption delaying agents, and the like, compatible with pharmaceutical administration.
  • Supplementary active compounds can also be incorporated into the compositions, e.g., dexamethasone; prednisone; gentamicin; brain-derived neurotrophic factor (BDNF); recombinant human insulin-like growth factor 1 (rhIGF-1), FGF, R-spondin, and/or GSK-3beta antagonists or inhibitors, e.g., one or more of the following GSK3 ⁇ inhibitors: Purvalanol A, olomoucine; lithium chloride (LiCl), alsterpaullone, and kenpaullone.
  • GSK3 ⁇ -inhibitors that are useful in the treatments described herein include benzyl-2-methyl-1,2,4-thiadiazolidine-3,5-dione (TDZD-8); 2-thio(3-iodobenzyl)-5-(1-pyridyl)-[1,3,4]-oxadiazole (GSK3 inhibitor II); 2,4-dibenzyl-5-oxothiadiazolidine-3-thione (OTDZT); (2′Z,3′E)-6-Bromoindirubin-3′-oxime (BIO); ⁇ -4-Dibromoacetophenone (i.e., Tau Protein Kinase I (TPK I) Inhibitor), 2-Chloro-1-(4,5-dibromo-thiophen-2-yl)-ethanone, N-(4-Methoxybenzyl)-N′-(5-nitro-1,3-thiazol-2-yl)urea (AR-A014418), H-KEAPPAPP
  • Exemplary indirubins include indirubin-5-sulfonamide; indirubin-5-sulfonic acid (2-hydroxyethyl)-amide indirubin-3′-monoxime; 5-iodo-indirubin-3′-monoxime; 5-fluoroindirubin; 5,5′-dibromoindirubin; 5-nitroindirubin; 5-chloroindirubin; 5-methylindirubin; and 5-bromoindirubin.
  • GSK3 ⁇ -inhibitors that can be used are known in the art, e.g., those disclosed in U.S. Pat. Nos. 6,417,185; 6,489,344; 6,608,063 and Published U.S. Applications Nos. 690497, filed Oct. 20, 2003; 468605, filed Aug. 19, 2003; 646625, filed Aug. 21, 2003; 360535, filed Feb. 6, 2003; 447031, filed May 28, 2003; and 309535 filed Dec. 3, 2002.
  • compositions are formulated to be compatible with the intended route of administration.
  • compositions are delivered systemically, e.g., by parenteral, e.g., intravenous, intradermal, or subcutaneous administration.
  • compositions are administered by application of a liquid or gel formulation to the round window membrane.
  • Application to the round window membrane can be accomplished using methods known in the art, e.g., intra-tympanic injection of a liquid or gel formulation or by direct delivery into the inner ear fluids, e.g., using a microfluidic device.
  • the compositions are delivered via a pump, e.g., a mini-osmotic pump, see, e.g., Takemura et al., Hear Res. 2004 October; 196(1-2):58-68, or a catheter, see, e.g., Charabi et al., Acta Otolaryngol Suppl. 2000; 543:108-10.
  • a pump e.g., a mini-osmotic pump, see, e.g., Takemura et al., Hear Res. 2004 October; 196(1-2):58-68
  • a catheter see, e.g., Charabi et al., Acta Otolaryngol Suppl. 2000; 543:108-10.
  • solutions or suspensions used for parenteral, intradermal, or subcutaneous application can include the following components: a sterile diluent such as water for injection, saline solution, fixed oils, polyethylene glycols, glycerine, propylene glycol or other synthetic solvents; antibacterial agents such as benzyl alcohol or methyl parabens; antioxidants such as ascorbic acid or sodium bisulfite; chelating agents such as ethylenediaminetetraacetic acid; buffers such as acetates, citrates or phosphates and agents for the adjustment of tonicity such as sodium chloride or dextrose. pH can be adjusted with acids or bases, such as hydrochloric acid or sodium hydroxide.
  • the parenteral preparation can be enclosed in ampoules, disposable syringes or multiple dose vials made of glass or plastic.
  • compositions suitable for injectable use can include sterile aqueous solutions (where water soluble) or dispersions and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersion.
  • suitable carriers include physiological saline, bacteriostatic water, Cremophor ELTM (BASF, Parsippany, N.J.) or phosphate buffered saline (PBS).
  • the composition must be sterile and should be fluid to the extent that easy syringability exists. It should be stable under the conditions of manufacture and storage and must be preserved against the contaminating action of microorganisms such as bacteria and fungi.
  • the carrier can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, and liquid polyetheylene glycol, and the like), and suitable mixtures thereof.
  • the proper fluidity can be maintained, for example, by the use of a coating such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants.
  • Prevention of the action of microorganisms can be achieved by various antibacterial and antifungal agents, for example, parabens, chlorobutanol, phenol, ascorbic acid, thimerosal, and the like.
  • isotonic agents for example, sugars, polyalcohols such as mannitol, sorbitol, sodium chloride in the composition.
  • Prolonged absorption of the injectable compositions can be brought about by including in the composition an agent that delays absorption, for example, aluminum monostearate and gelatin.
  • Sterile injectable solutions can be prepared by incorporating the active compound in the required amount in an appropriate solvent with one or a combination of ingredients enumerated above, as required, followed by filtered sterilization.
  • dispersions are prepared by incorporating the active compound into a sterile vehicle, which contains a basic dispersion medium and the required other ingredients from those enumerated above.
  • the preferred methods of preparation are vacuum drying and freeze-drying, which yield a powder of the active ingredient plus any additional desired ingredient from a previously sterile-filtered solution thereof.
  • the therapeutic compounds are prepared with carriers that will protect the therapeutic compounds against rapid elimination from the body, such as a controlled release formulation, including implants and microencapsulated delivery systems.
  • Liposomal suspensions including liposomes targeted to selected cells with monoclonal antibodies to cellular antigens
  • PLGA poly lactic/glycolic acid
  • the carrier comprises a polymer, e.g., a hydrogel, that increases retention of the compound on the round window and provides local and sustained release of the active ingredient.
  • a polymer e.g., a hydrogel
  • Such polymers and hydrogels are known in the art, see, e.g., Paulson et al., Laryngoscope. 2008 April; 118(4):706-11 (describing a chitosan-glycerophosphate (CGP)-hydrogel based drug delivery system); other carriers can include thermo-reversible triblock copolymer poloxamer 407 (see, e.g., Wang et al., Audiol Neurootol. 2009; 14(6):393-401. Epub 2009 Nov.
  • poloxamer-based hydrogels such as the one used in OTO-104 (see, e.g., GB2459910; Wang et al., Audiol Neurotol 2009; 14:393-401; and Piu et al., Otol Neurotol. 2011 January; 32(1):171-9); Pluronic F-127 (see, e.g., Escobar-Chavez et al., J Pharm Pharm Sci.
  • Pluronic F68, F88, or F108 polyoxyethylene-polyoxypropylene triblock copolymer (e.g., a polymer composed of polyoxypropylene and polyoxyethylene, of general formula E106 P70 E106; see GB2459910, US20110319377 and US20100273864); MPEG-PCL diblock copolymers (Hyun et al., Biomacromolecules. 2007 April; 8(4):1093-100. Epub 2007 Feb. 28); hyaluronic acid hydrogels (Borden et al., Audiol Neurootol.
  • compositions can be included in a container, pack, or dispenser together with instructions for administration.
  • mice were genotyped by PCR. All protocols were approved by the Institutional Animal Care and Use Committee of Massachusetts Eye and Ear Infirmary or the by the ethics committee of Keio University Union on Laboratory Animal Medicine, in compliance with the Public Health Service policy on humane care and use of laboratory animals.
  • the utricles and cochleae of 1- to 3-d-postnatal mice of both sexes were dissected, and after careful removal of the nerve trunk and mesenchymal tissues, were trypsinized and dissociated. Dissociated cells were centrifuged, and the pellet was resuspended and filtered through a 70 ⁇ m cell strainer (BD Biosciences Discovery Labware) in DMEM/F12 medium with N2/B27 supplement, EGF (20 ng/ml), IGF1 (50 ng/ml), bFGF (10 ng/ml), and heparan sulfate (50 ng/ml) (Sigma).
  • the single cells were cultured in nonadherent Petri dishes (Greiner Bio-One) to initiate clonal growth of spheres (49).
  • Spheres that formed after 2-3 d in culture were passaged every 4-6 d.
  • the spheres were centrifuged, and the pellet was mechanically dissociated with a pipette tip and resuspended in medium. Passage 3-4 spheres were used for experiments described here.
  • These cells are negative for hair cell markers (37) before the initiation of differentiation.
  • floating spheres were transferred to fibronectin-coated 4 well plates (Greiner Bio-One) as described before (37, 49). Attached spheres were differentiated for 5-7 d in DMEM/F12 medium with N2/B27 supplement but without growth factors.
  • Gamma-secretase inhibitors were added at several concentrations on the day following cell attachment.
  • Cochleae of 3-d-postnatal C57BL/6 or Mos-iCsp3; Pou4f3-Cre double transgenic mice of both sexes were dissected in Hanks solution (lnvitrogen). To obtain a flat cochlear surface preparation, the spiral ganglion, Reissner's membrane, and the most basal cochlear segment were removed. Explants were plated onto 4 well plates (Greiner Bio-One) coated with poly-L-ornithine (0.01%, Sigma) and laminin (50 ⁇ g/ml, Becton Dickinson). Cochlear explants were cultured in DMEM (Invitrogen) with 10% fetal bovine serum. All cultures were maintained in a 5% CO2/20% O2-humidified incubator (Forma Scientific).
  • mice 4-week-old mice were exposed free-field, awake and unrestrained, in a small reverberant chamber (22).
  • Acoustic trauma was produced by a 2 h exposure to an 8-16 kHz octave band noise presented at 116 dB SPL.
  • the exposure stimulus was generated by a custom white-noise source, filtered (Brickwall Filter with a 60 dB/octave slope), amplified (Crown power amplifier), and delivered (JBL compression driver) through an exponential horn fitted securely to a hole in the top of a reverberant box.
  • Sound exposure levels were measured at four positions within each cage using a 0.25 inch Bruel and Kj ⁇ r condenser microphone: sound pressure was found to vary by ⁇ 0.5 dB across these measurement positions.
  • mice 4-week-old mice weighing 12 to 16 g were used. Before surgery, the animals were anesthetized with ketamine (20 mg/kg, i.p.) and xylazine (100 mg/kg, i.p.), and an incision was made posterior to the pinna near the external meatus after local administration of lidocaine (1%). The otic bulla was opened to approach the round window niche. The end of a piece of PE 10 tubing (Becton Dickinson) was drawn to a fine tip in a flame and gently inserted into the round window niche. LY411575 was dissolved in DMSO and diluted 10-fold in polyethylene glycol 400 (Sigma) to a final concentration of 4 mM.
  • This solution (total volume 1 ⁇ l) was injected into the round window niche of the left ear. Polyethylene glycol 400 with 10% DMSO was injected into the right ear as a control. The solution was administered for 2 min.
  • This approach is presently used clinically (e.g. transtympanic injection of steroids for sudden hearing loss and gentamicin for severe balance disorders) and has the advantage of sparing the inner ear but still taking advantage of the local route provided by the round window membrane for delivery of drug into the inner ear (50).
  • Gelatin was placed on the niche to maintain the solution, and the wound was closed.
  • LY411575 50 mg/kg dissolved in 0.5% (wt/vol) methylcellulose (WAKO) was injected orally once daily for 5 consecutive d. Hearing was measured by ABR at 1 d before, 2 d, 1, 2 week, 1, 2 and 3 months after noise exposure.
  • RNAlater The organs of Corti were dissected in HBSS (Invitrogen) and stored in RNAlater (Ambion) at ⁇ 80° C. until further use. Total RNA was extracted using the RNeasy Mini Kit (Qiagen) according to the manufacturer's instructions. For reverse transcription, SuperScript II (Invitrogen) was used with random hexamers. The reverse transcription conditions were 25° C. for 10 min followed by 37° C. for 60 min. The reaction was terminated at 95° C. for 5 min. cDNAs were mixed with Taqman Gene Expression Mastermix (Applied Biosystems) and Hes5, Atoh1, or 18S primers (Applied Biosystems) according to the manufacturer's instructions.
  • Immunostaining was initiated by blocking for 1 h with 0.1% Triton X-100 in PBS supplemented with 1% BSA and 5% goat serum (PBT1). Fixed and permeabilized cells were incubated overnight in PBT1 with polyclonal antibody to myosin VIIa (Proteus Biosciences). Samples were washed three times for 20 min with PBS. Primary antibodies were detected with secondary antibodies conjugated with Alexa 488 (Molecular Probes), with secondary antibody alone used as a negative control. The samples were counterstained with DAPI (Vector Laboratories) or Hoechst 33258 (Invitrogen) for 10 min and viewed by epifluorescence microscopy (Axioskop 2 Mot Axiocam, Zeiss).
  • DAPI Vector Laboratories
  • Hoechst 33258 Invitrogen
  • mice For collection of mature mouse cochleae, after being deeply anesthetized with ketamine and xylazine, the mice were transcardially perfused with 0.01 M phosphate buffer (pH 7.4) containing 8.6% sucrose, followed by fixative consisting of freshly depolymerized 4% paraformaldehyde in 0.1 M phosphate buffer (pH 7.4). After decapitation, the temporal bones were removed and immediately placed in the same fixative at 4° C. Small openings were made at the round window, oval window, and apex of the cochlea. After immersion in the fixative overnight at 4° C., temporal bones were decalcified in 0.1 M EDTA (pH 7.4) containing 5% sucrose with stirring at 4° C.
  • Cochlear lengths were obtained for each case, and a cochlear frequency map computed to precisely localize inner hair cells from the 5.6, 8.0, 11.3, 16.0, 22.6, 32, and 45.2 kHz regions.
  • a cochlear frequency map computed to precisely localize inner hair cells from the 5.6, 8.0, 11.3, 16.0, 22.6, 32, and 45.2 kHz regions.
  • For cross-sectioning fixed temporal bones were sunk in 30% sucrose in PBS at 4° C., incubated in OCT at room temperature for 1 h, and frozen in liquid nitrogen. The staining protocol was the same as described above except for counterstaining with DAPI (Vector Laboratories). Specimens were viewed by epifluorescence microscopy (Axioskop 2 Mot Axiocam, Zeiss).
  • the total number of inner hair cells, outer hair cells, and supporting cells in the outer hair cell region was counted in each of four cochlear segments of 1200-1400 ⁇ m (apical, mid-apical, mid-basal, and basal). Density (cells per 100 ⁇ m) was then calculated for each segment. For mature cochleae, high-power images of frequency-specific regions (5.6, 8.0, 11.3, 16.0 kHz) according to the computed frequency map were assembled and analyzed. The number of inner hair cells, outer hair cells, and supporting cells in the outer hair cell region in 100 ⁇ m was counted in each of the four frequency-specific regions of the cochlea. The number of Sox2-lineage-positive cells identified by GFP was counted by the same method.
  • Auditory brain stem responses were measured in each animal at 7 log-spaced frequencies (half-octave steps from 5.6 to 45.2 kHz) before and 1 d after noise exposure, and 1-week, I-month, and 3-months after surgery.
  • Mice were anesthetized with ketamine (100 mg/kg i.p.) and xylazine (20 mg/kg i.p.). Needle electrodes were inserted at vertex and pinna, with a ground near the tail.
  • ABRs were evoked with 5-ms tone pips (0.5-ms rise-fall with a cos 2 onset envelope delivered at 35/s). The response was amplified, filtered and averaged in a LabVIEW-driven data-acquisition system.
  • Sound level was raised in 5 dB steps from ⁇ 10 dB below threshold ⁇ 80 dB SPL.
  • 1024 responses were averaged (with stimulus polarity alternated), using an “artifact reject,” whereby response waveforms were discarded when peak-to-peak response amplitude exceeded 15 ⁇ V.
  • ABR threshold was defined as the lowest SPL level at which any wave could be detected, usually corresponding to the level step just below that at which the peak-to-peak response amplitude rose significantly above the noise floor (approximately 0.25 ⁇ V). When no response was observed at the highest sound level available, the threshold was designated as being 5 dB greater than that level so that statistical tests could be done.
  • the wave 1 peak was identified by visual inspection at each sound level and the peak-to-peak amplitude computed.
  • the 2-tailed Mann-Whitney U test was used to compare differences among treatment groups. Changes before and after treatment of the same animal were analyzed by 2-tailed Wilcoxon t test. Repeated-measures ANOVA was used to compare time-dependent differences among groups. Data are presented in the text and in figures as mean ⁇ SEM. P values less than 0.05 were considered significant.
  • myosin VIIa-positive cells myosin VIIa is a specific marker for hair cells
  • FIG. 1B myosin VIIa-positive cells
  • LY411575 was further characterized on neonatal organ of Corti explants.
  • the addition of LY411575 increased the number of myosin VIIa-positive cells in the outer hair cell region ( FIG. 1C ) by 30 cells/100 ⁇ m compared to the control ( FIG. 1D , p ⁇ 0.05).
  • the additional hair cells showed hair bundle structures.
  • FIG. 2A organ of Corti explants from Pou4f3-Cre; Mos-iCsp3 double transgenic mice were used to test whether hair cells could be induced after damage.
  • This Mos-iCsp3 mouse has a Cre/lox cassette that produces a drug-regulated dimerizable caspase-3 (20) in hair cells, because Pou4f3, which is expressed transiently in the developing inner ear, is limited to hair cells (21).
  • the dimer leads to hair cell death.
  • Mos-iCsp3 cochleae showed loss of outer hair cells ( FIG. 2B vs FIG. 2C , control).
  • LY411575 treatment of Mos-iCsp3 organ of Corti increased the number of myosin VIIa-positive (hair) cells in the outer hair cell region ( FIG. 2D ; p ⁇ 0.05) and was accompanied by a decrease in the number of Sox2-positive (supporting) cells in the mid-apex and mid-base of the cochlea ( FIG. 2D ; p ⁇ 0.05). There were no significant differences in the number of inner hair cells in any group. The correlation between the increase in outer hair cells and the decrease in supporting cells after LY411575 treatment suggested that supporting cells transdifferentiated into hair cells when Notch signaling was prevented.
  • mice were first exposed to an acoustic injury (22) producing widespread outer hair cell death and permanent hearing loss with preservation of supporting cells (see Example 5 and FIGS. 7A-C ).
  • Oral LY411575 at 50 mg/kg body weight for 5 d decreased the noise-induced threshold shift at 4, 8 and 16 kHz ( FIG. 8A ).
  • Outer hair cell numbers were increased and the new hair cells had stereociliary bundles ( FIG. 8B ).
  • a lower dose (10 mg/kg body weight) had no therapeutic benefit.
  • Hes5 is a direct downstream target of Notch signaling that represses Atoh1 (25).
  • LY411575 was administered via the round window niche 1 d after noise exposure.
  • Hes5 mRNA expression increased by 2.15 ⁇ 0.26 compared to its pre-noise level and its level gradually decreased to reach the pre-noise level 3 d after noise exposure ( FIG. 3A ).
  • This induction was completely blocked in the LY411575 treated group at 1 d and stayed at the pre-noise level (significant difference from the control cochlea, p ⁇ 0.01).
  • Three days after LY411575 treatment the Hes5 expression level was unchanged from the control cochlea. In contrast to Hes5, Atoh1 expression remained stable after noise exposure ( FIG. 3B ).
  • In vivo lineage tracing was used to test whether transdifferentiation could account for new hair cells.
  • a Cre-reporter strain was used to perform lineage tracing of Sox2-positive cells since Sox2 is expressed in supporting cells.
  • Sox2-CreER; mT/mG mice cells expressing Sox2 at the time of tamoxifen administration become positive for GFP and retain expression even if they lose Sox2 expression ( FIG. 9 ).
  • Reporter mice were exposed to noise 1 week after tamoxifen treatment, and administered LY411575 to the left ear and carrier to the right ear 1 d after noise exposure.
  • the GFP-labeled cells showed positive staining for prestin, the motor protein of outer hair cells (Dallos et al., 2006), and were negative for VGLUT3, a marker of inner hair cells (Seal et al., 2008), as well as CtBP2, a synaptic ribbon marker that would be expected to be expressed if the new hair cells were active inner hair cells (Khimich et al., 2005; Liberman et al., 2011). This analysis of markers together with their location and V-shaped bundles identified them as outer hair cells. These double-labeled cells spanned the epithelium from basilar membrane to the endolymphatic surface ( FIG.
  • FIGS. 5A and B At 3 months the number of outer hair cells was increased throughout the middle of the cochlea (8-16 kHz) in LY411575 treated ears, compared to the carrier-treated contralateral ear ( FIGS. 5A and B; p ⁇ 0.05). The number of supporting cells in the outer hair cell region was decreased significantly in the same cochleae as the increase in outer hair cell number at the 8 and 11.3 kHz areas compared to the carrier-treated ear ( FIGS. 5A and B; p ⁇ 0.05). Decreases in supporting cells were also significant ( FIG. 5B , p ⁇ 0.05) similar to the explant cultures.
  • the outer hair cells were completely absent with and without LY411575 treatment in the most basal regions (above 22 kHz), and there were no significant changes in the numbers of inner hair cells in the treated group (data not shown).
  • the differences in outer hair cell number between LY411575 and carrier-treated ears are larger than the corresponding differences in the number of supporting cells.
  • the differences in outer hair cell number showed a similar trend, in regard to cochlear location, as the myosin VIIa-positive cells from the Sox2-lineage observed in Sox2-CreER; mT/mG mice ( FIG. 4G ).
  • ABR auditory brainstem response
  • threshold recoveries were observed in either ear at frequencies above 22.65 kHz by ABR and no recoveries above the noise floor of the distortion product otoacoustic emissions (DPOAE) could be seen.
  • the differences in threshold recovery showed a similar dependence on cochlea location/frequency as outer hair cell number (see FIG. 5 ).
  • Preliminary range finding experiments for drug treatment were carried out by systemic injection and were limited by toxicity.
  • a minimal dosing regimen for an effect on the thymus weight was chosen (43, 44).
  • mice administered 50 mg/kg for 5 d 6 could be tested for ABR at 3 months, the final time point of the LY411575 treatment. The rest died within the first week due to severe diarrhea and weight loss.
  • mice that survived also suffered from weight loss (approximately 15% loss in 3 d), with a loss of epithelial cells of their stomach and increase in secreting cells in all gastro-intestinal tract from esophagus to colon and severe atrophy in the spleen in a week; immunosuppression with an atrophy of thymus (total number of the cells were dramatically decreased to 1/40 and double positive fraction of CD4 and CD8 was decreased from 78.6% to 1.23%), changes in the skin color in the next week. Those changes resulted from Notch inhibition reported by previous papers (44, 45). A small threshold shift ( FIG. 8A ) that achieved statistical significance by comparison of the control and treated animals after 1 month and persisted to 3 months was observed at 4, 8 and 16 kHz.
  • a reporter line was used: mT/mG mice crossed with Sox2-CreER mice.
  • mT/mG mice cells that have undergone Cre recombination are labeled by expression of membrane-bound GFP (GFP; green fluorescence), and non-recombined cells express td-Tomato (red fluorescence) after tamoxifen treatment.
  • GFP membrane-bound GFP
  • td-Tomato red fluorescence

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WO2018081614A1 (en) * 2016-10-31 2018-05-03 Hough Ear Institute Methods for enhancing synaptogenesis and neuritogenesis
WO2018111926A3 (en) * 2016-12-16 2018-07-26 Sirocco Therapeutics, Inc. Methods of treating cochlear synaptopathy
US20180326080A1 (en) * 2015-10-27 2018-11-15 Purdue Research Foundation Polymer-based therapeutics for inductive browning of fat
US10301266B2 (en) * 2015-10-30 2019-05-28 Inception 3, Inc. Dibenzo azepine compounds and their use in the treatment of otic diseases and disorders

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