JP4046151B2 - Asthma treatment - Google Patents

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JP4046151B2
JP4046151B2 JP01118797A JP1118797A JP4046151B2 JP 4046151 B2 JP4046151 B2 JP 4046151B2 JP 01118797 A JP01118797 A JP 01118797A JP 1118797 A JP1118797 A JP 1118797A JP 4046151 B2 JP4046151 B2 JP 4046151B2
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asthma
reaction
asthmatic
ebselen
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JPH09263533A (en
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義之 内田
章 明石
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National Institute for Materials Science
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Description

【0001】
【発明の属する技術分野】
本発明は、喘息治療剤に関し、更に詳細には気管支喘息における喘息反応、中でも遅発型喘息反応を極めて有効に抑制する喘息治療剤に関する。
【0002】
【従来の技術及び発明が解決しようとする課題】
従来、気管支喘息は、I型アナフィラキシーによってもたらされる気道平滑筋収縮を主体とする病態と考えられてきた。しかし、気道平滑筋収縮を抑制する薬剤〔β受容体刺激剤、抗コリン剤(キサンチン誘導体)〕や気道平滑筋収縮作用を有する化学伝達物質の遊離抑制剤、合成阻害剤、受容体拮抗剤〔抗アレルギー剤、ロイコトリエン受容体拮抗剤、トロンボキサン合成阻害剤、トロンボキサン受容体拮抗剤、抗PAF(血小板活性化因子)剤、抗ヒスタミン系アレルギー剤等〕が気管支喘息の発作にあまり有効でないことから、化学伝達物質、気道平滑筋収縮以外の因子が気管支喘息の病態形成に関与していると考えられ、その因子として慢性気道炎症が考えられた。
【0003】
現在、この気道炎症に対しては、副腎皮質ホルモン剤、いわゆるステロイド剤が使用されている。しかし、この薬剤は有効ではあるが、その副作用が問題となり、そのため、副作用を最小限に抑えるための吸入製剤が開発された。しかしながら、ステロイド剤を吸入製剤としても、長期間使用することによりステロイド依存型喘息に移行する可能性があり、危険性を伴う。
【0004】
ところで、気管支喘息患者の喘息反応には、原因となる抗原を吸入することにより曝露直後に観察される即時型喘息反応と遅れて出現する遅発型喘息反応が存在することが知られている。この遅発型喘息反応は、患者が抗原を吸入した直後に発症する即時型喘息反応が自然に、又は簡単な治療によって短時間で消失した後、早ければ3〜4時間後、遅くなると12時間以上経過した後に発症するものであり、比較的高度の閉塞性障害が長時間持続する。
【0005】
最近ではこの遅発型喘息反応のメカニズムが明らかにされつつあり、遅発型喘息反応の繰り返しが気道過敏性の亢進とその定着化を来し、喘息の病態を悪化させることが示唆されている(Metzger WJ, Hunninghake GW, Richarson HB: Late asthmatic responses; inquiry into mechanismus and significance. Clin Rev Allergy 3: 145, 1985)。
【0006】
従って、副腎皮質ホルモン剤に代わり得る優れた効力を有し、即時型喘息反応と遅発型喘息反応を共に抑制することができ、しかも安全な気管支喘息の治療剤の開発が望まれている。
【0007】
なお、本発明で用いる代表的化合物である2−フェニル−1,2−ベンゾイソセレナゾール−3(2H)−オン(一般名:エブセレン)は、強いリポキシゲナーゼ阻害活性を有することが知られている〔Peter Kuhl et al., Prostaglandins, 31(1986), 1029-1048〕。しかし、エブセレン等の化合物の喘息に対する効果は未だ知られていない。
【0008】
【課題を解決するための手段】
斯かる実情において、本発明者らは鋭意研究を行った結果、後記一般式(1)又は(1′)で表わされる化合物が、気管支喘息における喘息反応、中でも遅発型喘息反応を極めて有効に抑制することを見出し、本発明を完成した。
【0009】
すなわち、本発明は、次の一般式(1)若しくは(1′)
【0010】
【化2】

Figure 0004046151
【0011】
(式中、R1 及びR2 は、それぞれ独立して水素原子、ハロゲン原子、トリフルオロメチル基、ニトロ基、炭素数1〜6のアルキル基又は炭素数1〜6のアルコキシル基を示し、R1 及びR2 が一緒になってメチレンジオキシ基を形成してもよい。R3 はアリール基、芳香族複素環基、5〜7員環のシクロアルキル基又は5〜7員環のシクロアルケニル基を示し、該アリール基、該芳香族複素環基、該シクロアルキル基及び該シクロアルケニル基は置換基を有していてもよい。R4 は水素原子、水酸基、−S−グルタチオン基、−S−α−アミノ酸基又はアリール部分に置換基を有していてもよいアラルキル基を示し、R5 は水素原子又は炭素数1〜6のアルキル基を示し、更にR4 及びR5 は一緒になって単結合を形成してもよい。Yは酸素原子又は硫黄原子を示し、nは0〜5の整数を示す。またセレン原子は酸化されていてもよい。)
で表わされる化合物又はその生理学的に許容し得る塩を有効成分とする喘息治療剤を提供するものである。
【0012】
なお、本発明において喘息治療剤とは、喘息の症状の緩和を期待して行われる、いわゆる治療、及び予防的治療に用いられる薬剤を意味する。
【0013】
【発明の実施の形態】
本発明の喘息治療剤の有効成分として用いられる化合物は前記一般式(1)又は(1′)で表わされるものであり(以下、化合物(1)又は(1′)という)、式中、R1 のうち炭素数1〜6のアルキル基としては、例えばメチル基、エチル基、プロピル基、イソプロピル基、n−ブチル基、イソブチル基、sec−ブチル基、ペンチル基等が挙げられ、炭素数1〜6のアルコキシル基としては、例えばメトキシル基、エトキシル基、プロポキシル基等が挙げられる。また、R3 のうちアリール基としては、例えばフェニル基等が;シクロアルキル基としては、例えばシクロペンチル基、シクロヘキシル基、シクロヘプチル基等が;シクロアルケニル基としては、例えば、1−シクロペンテニル基、1−シクロヘキセニル基、1−シクロヘプテニル基等が;芳香族複素環基としては、例えばピリジル基、ピリミジル基、イミダゾリル基、オキサゾリル基、イソオキサゾリル基、チアゾリル基、フリル基等の5又は6員環の芳香族複素環基等が挙げられる。これらの基は置換基を有していてもよいが、かかる置換基としては、例えば炭素数1〜6のアルキル基又は炭素数1〜6のアルコキシル基、ハロゲン原子、カルボキシル基、水酸基等が挙げられ、置換基の個数は1〜3であることが好ましい。更に、R4 のうち−S−グルタチオン基は、グルタチオンのチオール部分から水素原子が除去されて形成された基を;−S−α−アミノ酸基は、分子内にチオール基を含むα−アミノ酸のチオール部分から水素原子が除去されて形成された基を意味し、アラルキル基としては、例えばベンジル基等が挙げられる。これらのうち、特にR4 とR5 が一緒になって単結合を形成したものが好ましく、就中、次式で表わされる2−フェニル−1,2−ベンゾイソセレナゾール−3(2H)−オンが好ましい。
【0014】
【化3】
Figure 0004046151
【0015】
また、上記化合物の活性代謝物と考えられている以下に具体例を示すような化合物でもよい。
【0016】
【化4】
Figure 0004046151
【0017】
更に、本発明においては、これらの化合物から導かれる生理学的に許容し得る塩を使用することもできる。
【0018】
これらの化合物(1)又は(1′)は公知であり、例えば特開昭59−42373号公報、特開昭57−67568号公報、特開昭59−39894号公報、特開昭60−226868号公報、特開昭61−50963号公報、バイオケミカル ファーマコロジー Vol. 33, No.20, 3235〜3239及び3241〜3245(1984)等に記載されている方法に従って製造することができる。
【0019】
化合物(1)又は(1′)及びその生理学的に許容し得る塩は、後記試験例に示すように、気管支喘息における即時型及び遅発型の喘息反応、中でも遅発型喘息反応に対して優れた抑制効果を示した。またその毒性は、マウス及びラットに経口又は腹腔内投与して検討した結果、下記LD50(mg/kg)値で示されるように極めて低毒性のものであった。更に、高用量投与時の所見としても副作用的に問題となるものは認められなかった。
【0020】
【表1】
Figure 0004046151
【0021】
本発明の喘息治療剤は、前記化合物(1)若しくは(1′)又はその生理学的に許容し得る塩に、滑沢剤、崩壊剤、結合剤、賦形剤等の添加剤を加え、通常知られた方法に従って製造することができ、錠剤、カプセル剤、散剤、細粒剤、液剤、懸濁剤、乳剤、ドライシロップ、吸入剤、注射剤、坐剤等の経口又は非経口投与用の剤形に製剤化することができる。
【0022】
化合物(1)若しくは(1′)又はその生理学的に許容し得る塩の投与量は、投与経路、患者の症状、体重等により異なるが、通常成人1人当り、経口投与の場合100〜2000mg/日、特に200〜1000mg/日が好ましい。
【0023】
【発明の効果】
本発明の薬剤は、気管支喘息における即時型喘息反応及び遅発型喘息反応に対して抑制効果を示し、中でも、遅発型喘息反応に対して優れた抑制効果を示す。更に本発明の薬剤は低毒性であり、人体に投与しても安全である。
【0024】
【実施例】
次に、実施例を挙げ、本発明を更に説明するが、本発明はこれら実施例に限定されるものではない。
【0025】
試験例
エブセレンの抗原誘発喘息モルモットに対する効果を確認するため、無麻酔、自発呼吸下に肺機能を測定し観察した。
【0026】
<方法>
(1)動物:
Hartley系雌性モルモット(SLC)(4週令,体重約250〜300g)をシクロフォスファミド(2mg/kg)で前処置し、2日後に卵アルブミン(OA)1mgとアルミゲル1gを腹腔内に注射し、その3週後に再びOA0.1mgとアルミゲル1gを腹腔内に注射した後感作モルモットとして使用した。モルモットは実験使用時に11週令になっており体重約450〜580gである。
(2)装置及び器具:
・圧型ボディプレシスモグラフ
・ピューモタコグラフ(TP−601G,日本光電社製)
・ディファレンシャルトランスデューサー(T−601,日本光電社製)
・気流抵抗管(Lilly型,日本光電社製)
・オシロスコープ(DS−9121,岩崎通信機社製)
・コンピュータ(Macintosh Centris 660AV,Apple社製)
・ソフトウェア(LabView for Macintosh 3.01により作成した呼吸解析ソフト)
・ネブライザー(NE−U10,立石電機社製)
(3)薬剤の投与方法及び抗原曝露の方法:
・デキサメサゾン前処置群
100%DMSO1mlに、デキサメサゾン1mg/kgを溶解し、4日間連続して腹腔内に注射した。最後の腹腔内注射は、抗原曝露24時間前に行った。
・エブセレン前処置群
100%DMSO1mlに、エブセレン5mg/kgを溶解し、抗原曝露30分前に腹腔内に注射した。
・コントロール群
100%DMSO1mlを抗原曝露30分前に腹腔内に注射した。
・抗原曝露の方法
OA40mgを生理食塩水10mlに溶解(4mg/ml)して、超音波ネブライザーにて2分間吸入させた。
(4)肺機能測定方法:
Agrawalの方法(Agrawal, K. P.; Specific airway conductance in guinea pigs: Normal values and histamine induced fall. Respiratory Physiology 43:23, 1981)に従い、圧型ボディプレシスモグラフにモルモットを固定し、特殊気道コンダクタンス(sGaw)の変化率を測定した。鼻からの気流及びboxの内圧の変化をモニターし、それぞれの波形を1024Hzでデジタルサンプリングし、呼気終末から吸気開始にかけてのドットを回帰させ、その回帰直線の傾き(tan)からsGawを算出した。抗原曝露前にsGawを計測、次に生理食塩水を2分間吸入させsGawに変化がないことを確認し、この値を100%として抗原曝露後のsGawの変化率を観察した。
【0027】
<結果>
この結果を図1に示す。このグラフに示されるように、エブセレン前処置群はコントロール群と比較して即時型喘息反応及び遅発型喘息反応ともに抑制された。
またデキサメサゾン前処置群との比較では、即時型喘息反応の抑制はほぼ同等であったが、遅発型喘息反応はエブセレン前処置群で顕著に抑制され、コントロール群で180〜420分の間に観察された遅発型喘息反応がほぼ完全に抑制された。
なお、モルモットでのデキサメサゾン1mg/kgを4日間という投与量は、ヒト(体重60kg)に換算すると、240(60mg×4日)mgのデキサメサゾンに相当し、この量のデキサメサゾンはプレドニゾロン2400mgに相当する(デキサメサゾン0.5mgは、プレドニゾロン5mgに相当)。
このプレドニゾロンの量(2400mg)は、1日1gのプレドニゾロンを3日間連続して投与するパルス療法の量に匹敵する。
このことから明らかなように、エブセレンは、現在臨床の現場にて採用されている治療方法よりも、優れた効果を有する。
【0028】
実施例1
錠剤:
下記組成の錠剤を常法により製造した。
【表2】
エブセレン 50mg
カルボキシメチルセルロース 25mg
デンプン 5mg
結晶セルロース 40mg
ステアリン酸マグネシウム 2 mg
計 122mg
【図面の簡単な説明】
【図1】エブセレンの抗原誘発喘息モルモットに対する喘息反応抑制効果を示す図である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a therapeutic agent for asthma, and more particularly to a therapeutic agent for asthma that extremely effectively suppresses an asthmatic reaction in bronchial asthma, particularly a late asthmatic reaction.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, bronchial asthma has been considered to be a pathological condition mainly composed of airway smooth muscle contraction caused by type I anaphylaxis. However, agents that suppress airway smooth muscle contraction [β receptor stimulants, anticholinergic agents (xanthine derivatives)], chemical mediator release inhibitors, synthesis inhibitors, receptor antagonists [ Antiallergic agents, leukotriene receptor antagonists, thromboxane synthesis inhibitors, thromboxane receptor antagonists, anti-PAF (platelet activating factor) agents, antihistamine allergic agents, etc.) are not very effective for attacks of bronchial asthma Therefore, it was considered that factors other than chemical mediators and airway smooth muscle contraction were involved in the pathogenesis of bronchial asthma, and chronic airway inflammation was considered as the factor.
[0003]
Currently, corticosteroids, so-called steroids, are used for this airway inflammation. However, while this drug is effective, its side effects have become a problem, and therefore inhalation formulations have been developed to minimize side effects. However, even if the steroid agent is used as an inhalation preparation, there is a possibility that it may shift to steroid-dependent asthma by using it for a long period of time.
[0004]
By the way, it is known that an asthmatic reaction of a bronchial asthma patient includes an immediate asthmatic reaction observed immediately after exposure by inhaling a causative antigen and a delayed asthmatic reaction appearing late. This delayed-type asthmatic reaction is caused by an immediate asthmatic reaction that develops immediately after the patient inhales the antigen, or after disappearing in a short time by simple treatment, 3 to 4 hours at the earliest, and 12 hours when it becomes late It develops after the lapse of the above, and a relatively high degree of obstructive disorder persists for a long time.
[0005]
Recently, the mechanism of this delayed asthmatic reaction is being elucidated, and it has been suggested that repeated delayed asthmatic reactions result in increased airway hypersensitivity and its establishment, which worsens the pathology of asthma (Metzger WJ, Hunninghake GW, Richarson HB: Late asthmatic responses; inquiry into mechanismus and significance. Clin Rev Allergy 3: 145, 1985).
[0006]
Therefore, it is desired to develop a safe therapeutic agent for bronchial asthma that has superior efficacy that can be substituted for an adrenocortical hormone agent, can suppress both an immediate asthmatic reaction and a delayed asthmatic reaction.
[0007]
In addition, it is known that 2-phenyl-1,2-benzoisoselenazol-3 (2H) -one (generic name: ebselen), which is a representative compound used in the present invention, has a strong lipoxygenase inhibitory activity. [Peter Kuhl et al., Prostaglandins, 31 (1986), 1029-1048]. However, the effect of compounds such as ebselen on asthma is not yet known.
[0008]
[Means for Solving the Problems]
In such circumstances, the present inventors have conducted intensive research, and as a result, the compound represented by the following general formula (1) or (1 ′) is very effective in asthmatic reaction in bronchial asthma, particularly late asthmatic reaction. As a result, the present invention has been completed.
[0009]
That is, the present invention provides the following general formula (1) or (1 ′)
[0010]
[Chemical 2]
Figure 0004046151
[0011]
(Wherein R 1 and R 2 each independently represent a hydrogen atom, a halogen atom, a trifluoromethyl group, a nitro group, an alkyl group having 1 to 6 carbon atoms or an alkoxyl group having 1 to 6 carbon atoms; 1 and R 2 together may form a methylenedioxy group, where R 3 is an aryl group, an aromatic heterocyclic group, a 5- to 7-membered cycloalkyl group or a 5- to 7-membered cycloalkenyl group. The aryl group, the aromatic heterocyclic group, the cycloalkyl group, and the cycloalkenyl group may have a substituent, R 4 represents a hydrogen atom, a hydroxyl group, an —S-glutathione group, — An S-α-amino acid group or an aralkyl group which may have a substituent in the aryl moiety; R 5 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms; and R 4 and R 5 together And may form a single bond, where Y is an oxygen atom It represents a sulfur atom, n is an integer of 0-5. The selenium atom may be oxidized.)
Or a physiologically acceptable salt thereof as an active ingredient.
[0012]
In the present invention, the therapeutic agent for asthma means a drug used for so-called treatment and prophylactic treatment, which is performed with the expectation of alleviating the symptoms of asthma.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The compound used as the active ingredient of the therapeutic agent for asthma of the present invention is represented by the general formula (1) or (1 ′) (hereinafter referred to as compound (1) or (1 ′)), wherein R the alkyl group having 1 to 6 carbon atoms of 1, for example a methyl group, an ethyl group, a propyl group, an isopropyl group, n- butyl group, isobutyl group, sec- butyl group, a pentyl group and the like, carbon atoms 1 Examples of the ˜6 alkoxyl group include a methoxyl group, an ethoxyl group, and a propoxyl group. Also, among R 3 , the aryl group is, for example, a phenyl group; the cycloalkyl group is, for example, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, etc .; the cycloalkenyl group is, for example, a 1-cyclopentenyl group, 1-cyclohexenyl group, 1-cycloheptenyl group, etc .; examples of the aromatic heterocyclic group include 5- or 6-membered ring such as pyridyl group, pyrimidyl group, imidazolyl group, oxazolyl group, isoxazolyl group, thiazolyl group, and furyl group An aromatic heterocyclic group etc. are mentioned. These groups may have a substituent. Examples of the substituent include an alkyl group having 1 to 6 carbon atoms or an alkoxyl group having 1 to 6 carbon atoms, a halogen atom, a carboxyl group, and a hydroxyl group. The number of substituents is preferably 1 to 3. In addition, -S-glutathione group in R 4 is a group formed by removing a hydrogen atom from the thiol part of glutathione; -S-α-amino acid group is an α-amino acid containing a thiol group in the molecule. This means a group formed by removing a hydrogen atom from a thiol moiety, and examples of the aralkyl group include a benzyl group. Of these, those in which R 4 and R 5 are combined to form a single bond are preferred, and in particular, 2-phenyl-1,2-benzoisoselenazole-3 (2H) — represented by the following formula: ON is preferred.
[0014]
[Chemical 3]
Figure 0004046151
[0015]
Moreover, the compound which is considered as the active metabolite of the said compound, and a specific example is shown below.
[0016]
[Formula 4]
Figure 0004046151
[0017]
Furthermore, in the present invention, physiologically acceptable salts derived from these compounds can also be used.
[0018]
These compounds (1) or (1 ′) are known, and for example, JP-A-59-42373, JP-A-57-67568, JP-A-59-39894, JP-A-60-226868. No. 1, JP-A 61-50963, Biochemical Pharmacology Vol. 33, No. 20, 3235-3239, 3241-3245 (1984) and the like.
[0019]
Compound (1) or (1 ′) and physiologically acceptable salts thereof are suitable for immediate and delayed asthmatic reactions in bronchial asthma, particularly for late asthmatic reactions, as shown in the following test examples. Excellent suppression effect was shown. Further, as a result of examination by oral or intraperitoneal administration to mice and rats, the toxicity was extremely low toxicity as indicated by the following LD 50 (mg / kg) value. Furthermore, no findings causing side effects were found as findings at the time of high dose administration.
[0020]
[Table 1]
Figure 0004046151
[0021]
The therapeutic agent for asthma of the present invention is usually obtained by adding additives such as a lubricant, a disintegrant, a binder, and an excipient to the compound (1) or (1 ′) or a physiologically acceptable salt thereof. An agent for oral or parenteral administration, such as tablets, capsules, powders, fine granules, solutions, suspensions, emulsions, dry syrups, inhalants, injections, suppositories, etc., which can be produced according to known methods It can be formulated into a form.
[0022]
The dose of compound (1) or (1 ′) or a physiologically acceptable salt thereof varies depending on the route of administration, patient symptoms, body weight, etc., but is usually 100 to 2000 mg / per adult when administered orally. Day, in particular 200 to 1000 mg / day is preferred.
[0023]
【The invention's effect】
The drug of the present invention exhibits an inhibitory effect on immediate asthma reaction and delayed asthma reaction in bronchial asthma, and particularly shows an excellent inhibitory effect on delayed asthma reaction. Furthermore, the drug of the present invention has low toxicity and is safe to administer to the human body.
[0024]
【Example】
EXAMPLES Next, although an Example is given and this invention is further demonstrated, this invention is not limited to these Examples.
[0025]
Test Example In order to confirm the effect of ebselen on antigen-induced asthma guinea pigs, lung function was measured and observed under anesthesia and spontaneous breathing.
[0026]
<Method>
(1) Animals:
Hartley female guinea pig (SLC) (4 weeks old, body weight about 250-300 g) was pretreated with cyclophosphamide (2 mg / kg), and 2 days later, ovalbumin (OA) 1 mg and aluminum gel 1 g were injected intraperitoneally. Three weeks later, 0.1 mg of OA and 1 g of aluminum gel were again injected into the abdominal cavity and used as a sensitized guinea pig. Guinea pigs are 11 weeks old when used in experiments and weigh approximately 450-580 g.
(2) Equipment and instruments:
・ Pressure type body plethysmograph ・ Pumo tachograph (TP-601G, manufactured by Nihon Kohden)
・ Differential transducer (T-601, manufactured by Nihon Kohden)
・ Airflow resistance tube (Lilly type, Nihon Kohden)
・ Oscilloscope (DS-9121, manufactured by Iwasaki Tsushinki Co., Ltd.)
・ Computer (Macintosh Centris 660AV, manufactured by Apple)
・ Software (Respiration analysis software created with LabView for Macintosh 3.01)
・ Nebulizer (NE-U10, manufactured by Tateishi Electric Co., Ltd.)
(3) Drug administration method and antigen exposure method:
Dexamethasone pretreatment group Dexamethasone 1 mg / kg was dissolved in 1 ml of 100% DMSO and injected intraperitoneally for 4 consecutive days. The last intraperitoneal injection was performed 24 hours prior to antigen exposure.
Ebselen pretreatment group 5 mg / kg of ebselen was dissolved in 1 ml of 100% DMSO and injected intraperitoneally 30 minutes before antigen exposure.
Control group 1 ml of 100% DMSO was injected intraperitoneally 30 minutes before antigen exposure.
-Antigen exposure method 40 mg of OA was dissolved in 10 ml of physiological saline (4 mg / ml) and inhaled with an ultrasonic nebulizer for 2 minutes.
(4) Lung function measurement method:
According to Agrawal's method (Agrawal, KP; Specific airway conductance in guinea pigs: Normal values and histamine induced fall.Respiratory Physiology 43:23, 1981), a guinea pig was fixed to the pressure-type body plethysmograph, and the special airway conductance (sGaw) The rate of change was measured. Changes in the airflow from the nose and the internal pressure of the box were monitored, each waveform was digitally sampled at 1024 Hz, the dots from the end of expiration to the start of inspiration were regressed, and sGaw was calculated from the slope (tan) of the regression line. SGaw was measured before antigen exposure, and then physiological saline was inhaled for 2 minutes to confirm that sGaw did not change. This value was taken as 100%, and the rate of change of sGaw after antigen exposure was observed.
[0027]
<Result>
The result is shown in FIG. As shown in this graph, the ebselen pretreatment group suppressed both the immediate asthma reaction and the delayed asthma reaction as compared with the control group.
In comparison with the dexamethasone pretreatment group, the immediate asthma response was almost the same, but the delayed asthma reaction was markedly suppressed in the ebselen pretreatment group, and between 180 and 420 minutes in the control group. The observed late asthmatic response was almost completely suppressed.
The dose of dexamethasone 1 mg / kg for 4 days in guinea pigs corresponds to 240 (60 mg × 4 days) dexamethasone when converted to human (body weight 60 kg), and this amount of dexamethasone corresponds to 2400 mg of prednisolone. (Dexamethasone 0.5 mg corresponds to prednisolone 5 mg).
This amount of prednisolone (2400 mg) is comparable to the amount of pulse therapy in which 1 g of prednisolone daily is administered for 3 consecutive days.
As is apparent from this, ebselen has an effect superior to the treatment methods currently employed in clinical practice.
[0028]
Example 1
tablet:
Tablets having the following composition were produced by a conventional method.
[Table 2]
Ebselen 50mg
Carboxymethylcellulose 25mg
5mg starch
Crystalline cellulose 40mg
Magnesium stearate 2 mg
Total 122mg
[Brief description of the drawings]
FIG. 1 is a graph showing the inhibitory effect of ebselen on antigen-induced asthma guinea pigs.

Claims (1)

2−フェニル−1,2−ベンゾイソセレナゾール−3(2H)−オン又はその生理学的に許容し得る塩を有効成分とする気管支喘息の遅発型喘息反応抑制剤。 A late asthmatic reaction inhibitor of bronchial asthma comprising 2-phenyl-1,2-benzoisoselenazol-3 (2H) -one or a physiologically acceptable salt thereof as an active ingredient .
JP01118797A 1996-01-26 1997-01-24 Asthma treatment Expired - Fee Related JP4046151B2 (en)

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