JP4802470B2 - Liver fibrosis inhibitor - Google Patents
Liver fibrosis inhibitor Download PDFInfo
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- JP4802470B2 JP4802470B2 JP2004279950A JP2004279950A JP4802470B2 JP 4802470 B2 JP4802470 B2 JP 4802470B2 JP 2004279950 A JP2004279950 A JP 2004279950A JP 2004279950 A JP2004279950 A JP 2004279950A JP 4802470 B2 JP4802470 B2 JP 4802470B2
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- liver
- chronic hepatitis
- liver fibrosis
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- polaprezinc
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Description
本発明は、慢性肝炎の進行に伴って生じる肝線維化を抑制する医薬に関する。 The present invention relates to a medicament for suppressing liver fibrosis that occurs with the progression of chronic hepatitis.
慢性肝炎は、主に肝炎ウイルスによる慢性的な肝障害であり、急性ウイルス肝炎や一定期間経過しても治癒しないものや、同じような症状のものをいう。ウイルス性の慢性肝炎にはB型慢性肝炎、C型慢性肝炎等がある。ウイルス以外の原因としてはアルコール、薬物、中毒、脂肪肝、ウイルソン病、自己免疫性肝炎などがある。 Chronic hepatitis is a chronic liver disorder mainly caused by the hepatitis virus, and refers to acute viral hepatitis, those that do not cure even after a certain period of time, and those with similar symptoms. Examples of viral chronic hepatitis include chronic hepatitis B and chronic hepatitis C. Causes other than viruses include alcohol, drugs, poisoning, fatty liver, Wilson's disease, autoimmune hepatitis and the like.
これらの慢性肝炎が進行すると肝硬変となる。肝硬変の病理学的所見は、肝細胞の持続的な崩壊が起こり、通常では肝細胞の再生によって修復されるのが、肝細胞の障害が強くそれに続いて起こる炎症反応が長時間持続、反復することで線維が多くなって硬くなり、残存した肝細胞の強い再生とあわさって肝臓内に結節を形成する。この結節が肝臓内部の静脈を中心とする血管系を圧迫して、肝臓の内外の血行を大きく障害する。これによって門脈圧の亢進、肝血流の減少などが起こり、これらのことが更に肝細胞の障害を増悪させるという悪循環が起こる。 As these chronic hepatitis progresses, cirrhosis occurs. The pathological findings of cirrhosis are persistent destruction of hepatocytes, usually repaired by regeneration of hepatocytes, but the damage of the hepatocytes is strong and the subsequent inflammatory reaction persists and repeats for a long time As a result, the fibers become harder and harder, and together with the strong regeneration of the remaining hepatocytes, nodules are formed in the liver. This nodule compresses the vascular system centered on the veins inside the liver, greatly impairing blood circulation inside and outside the liver. This causes an increase in portal pressure, a decrease in hepatic blood flow, and the like, and this causes a vicious cycle in which the damage to hepatocytes is further exacerbated.
このように慢性肝炎から肝硬変に至る際に、肝の線維化が生じ、これにより可逆的な状態である慢性肝炎から不可逆的な状態である肝硬変になる。従って、慢性肝炎の進行に伴なって生じる肝線維化を抑制する薬剤は、慢性肝炎の治療薬として極めて重要である。 In this way, when hepatitis leads to cirrhosis, fibrosis of the liver occurs, which changes from reversible chronic hepatitis to irreversible cirrhosis. Therefore, a drug that suppresses liver fibrosis caused by the progression of chronic hepatitis is extremely important as a therapeutic drug for chronic hepatitis.
従来の慢性肝炎治療薬としては、インターフェロン、ラミブジン及び肝庇護剤等が知られているが、インターフェロン及びラミブジンは抗ウイルス剤であり、肝庇護剤は主に肝細胞障害に対する効果が期待される薬剤であり、肝線維化抑制効果はない。 As conventional therapeutic agents for chronic hepatitis, interferon, lamivudine, liver protection agent, etc. are known. And there is no liver fibrosis inhibitory effect.
一方、ポラプレジンク(L−カルノシン亜鉛塩)は、消化性潰瘍治療薬(特許文献1)として有用であることが知られており、広く使用されている。またポラプレジンクは、急性肝炎モデルである四塩化炭素肝障害に有効であることが知られている(特許文献2)。しかし、ポラプレジンクが慢性肝炎に対してどのような作用をするかは全く知られていない。
本発明の目的は、慢性肝炎における肝線維化を抑制する医薬を提供することにある。 An object of the present invention is to provide a medicament for suppressing liver fibrosis in chronic hepatitis.
そこで本発明者は、慢性肝炎モデルであり、四塩化炭素肝障害とは全く異なる機序で肝障害が生じることが知られているチオアセタミドモデルを用いて肝線維化抑制薬を探索したところ、ポラプレジンクが優れた肝線維化抑制作用を有することを見出し本発明を完成するに至った。 Therefore, the present inventor searched for a hepatic fibrosis inhibitor using a thioacetamide model, which is a chronic hepatitis model and is known to cause liver damage by a mechanism completely different from carbon tetrachloride liver damage. However, the present inventors have found that polaprezinc has an excellent liver fibrosis-inhibiting action and have completed the present invention.
すなわち、本発明は、ポラプレジンクを有効成分とする肝線維化抑制剤を提供するものである。 That is, the present invention provides a liver fibrosis inhibitor containing polaprezinc as an active ingredient.
本発明によれば、慢性肝炎に伴なって生じる肝線維化を顕著に抑制することができ、慢性肝炎から肝硬変への進行を防止することができる。 According to the present invention, it is possible to remarkably suppress liver fibrosis caused by chronic hepatitis, and to prevent progression from chronic hepatitis to cirrhosis.
本発明医薬の有効成分であるポラプレジンク、すなわち、L−カルノシン亜鉛塩は、例えば前記特許文献1、2、特公平7−116160号公報、特公平3−5367号公報等に記載の製法により得ることができる。
後記実施例に示すように、ポラプレジンクは慢性肝炎モデルであるチオアセタミドモデルに対し、優れた治療効果、特に肝線維化マーカーである、組織中のヒドロキシプロリン量、ヒアルロン酸を顕著に低下させ、かつ組織学的にも肝線維化を顕著に抑制し、またTGF−β1量も顕著に低下させる作用を有する。ポラプレジンクのこのような効果が、チオアセタミドの前投与でなく、チオアセタミドを投与している途中の投与、すなわち慢性肝炎発症後の投与でも得られたことは極めて重要である。従って、ポラプレジンクは、肝線維化抑制剤、特に慢性肝炎における肝線維化抑制剤として有用である。
Polaprezinc, that is, L-carnosine zinc salt, which is an active ingredient of the medicament of the present invention, is obtained by the production method described in, for example, Patent Documents 1 and 2, Japanese Patent Publication No. 7-116160, Japanese Patent Publication No. 3-5367, etc. Can do.
As shown in the examples below, polaprezinc significantly reduced the amount of hydroxyproline and hyaluronic acid in the tissue, which is an excellent therapeutic effect, especially a fibrosis marker, compared to the thioacetamide model, which is a chronic hepatitis model. and also significantly inhibited hepatic fibrosis histologically, also has the effect of also significantly reduced TGF-beta 1 volume. It is extremely important that such an effect of polaprezinc was obtained not during the pre-administration of thioacetamide but also during the administration of thioacetamide, that is, after the onset of chronic hepatitis. Therefore, polaprezinc is useful as a liver fibrosis inhibitor, particularly a liver fibrosis inhibitor in chronic hepatitis.
本発明の医薬としては、経口投与用製剤が好ましく、特に錠剤、散剤、顆粒剤、シロップ剤、カプセル剤等が好ましい。 As the medicament of the present invention, a preparation for oral administration is preferable, and tablets, powders, granules, syrups, capsules and the like are particularly preferable.
これらの製剤を製造するには、適当な添加剤、例えば注射用蒸留水、精製水、カルボキシメチルセルロースカルシウム、カルボキシメチルセルロースナトリウム、乳糖、ソルビット、マンニット、白糖、トウモロコシデンプン、結晶セルロース、ラクチトール、セルロース誘導体、アラビアゴム、トラガントゴム、ゼラチン、ポリソルベート80、タルク、ステアリン酸マグネシウム、水、エタノール、白色ワセリン、グリセリン、脂肪、脂肪油、グリコール類、ステアリルアルコールなどの高級アルコール類、プラスチベース、パラフィン、ミツロウ、ポリオキシエチレン硬化ヒマシ油、サッカリン、パインシロップ等を適宜選択、組合わせて使用することができる。
In order to produce these preparations, suitable additives such as distilled water for injection, purified water, carboxymethylcellulose calcium, sodium carboxymethylcellulose, lactose, sorbit, mannitol, sucrose, corn starch, crystalline cellulose, lactitol, cellulose derivatives Arabic gum, tragacanth gum, gelatin,
ポラプレジンクの投与量は年齢、体重、病態症状、治療効果、投与方法、投与時期、投与回数、投与期間により異なるが、好ましくは成人1回あたり0.01〜10gであり、これは1日1〜4回に分けて投与してもよい。 The dose of polaprezin varies depending on age, body weight, pathologic symptoms, therapeutic effect, administration method, administration timing, administration frequency, administration period, but is preferably 0.01 to 10 g per adult, It may be administered in four divided doses.
次に実施例を挙げて本発明を更に詳細に説明するが、本発明は何ら実施例に限定されるものではない。 EXAMPLES Next, although an Example is given and this invention is demonstrated in detail, this invention is not limited to an Example at all.
実施例1
ラットを1群15匹ずつに分けた。対照群には、チオアセタミド水溶液(300mg/L)を飲料水として、10週間又は20週間にわたって連続的に投与した。また試験群には、チオアセタミド水溶液(300mg/L)を飲料水として、20週間にわたって連続的に投与し、かつ10週後から20週までポラプレジンク200mg/day/kg又は500mg/day/kgを経口投与した。
Example 1
Rats were divided into 15 animals per group. In the control group, a thioacetamide aqueous solution (300 mg / L) was continuously administered as drinking water for 10 weeks or 20 weeks. In the test group, thioacetamide aqueous solution (300 mg / L) was administered as drinking water continuously for 20 weeks, and
対照群及び試験群のラットは、所定の投与終了後に殺し、肝臓を摘出した。肝線維化の血清中マーカーであるヒアルロン酸はラテックス凝集免疫比濁法で測定、肝組織の線維化のマーカーであるヒドロキシプロリンは塩酸処理しクロラミンとエルリッヒ液を使用し吸光度で測定した。肝線維化促進に特異的に作用し、肝組織内で増加するTGF−β1はELISA法で測定し。肝組織を染色する目的でシリウスレッド染色を行い、線維化の主役となる活性化した星細胞をα−SMA免疫染色で特異的に同定した。また、肝障害のマーカーである血清中トランスフェレース、アルカリカリフォスファターゼを生化学的手法にて測定した。
それらの結果を、図1、図2、図3、図4及び表1に示す。
The rats in the control group and the test group were killed after the prescribed administration and the liver was removed. Hyaluronic acid, a serum marker of liver fibrosis, was measured by latex agglutination immunoturbidimetry, and hydroxyproline, a marker of liver tissue fibrosis, was treated with hydrochloric acid and measured by absorbance using chloramine and Erlich's solution. TGF-β 1 that specifically acts on the promotion of liver fibrosis and increases in liver tissue is measured by ELISA. Sirius red staining was performed for the purpose of staining liver tissue, and activated stellate cells that play a major role in fibrosis were specifically identified by α-SMA immunostaining. In addition, serum transferase and alkaline caliphosphatase, which are markers of liver damage, were measured by biochemical techniques.
The results are shown in FIG. 1, FIG. 2, FIG. 3, FIG.
図1、図2、図3及び図4から明らかなように、ポラプレジンクは、チオアセタミド投与開始から10週後から投与を開始したにもかかわらず、肝線維化マーカーであるヒドロキシプロリン量、ヒアルロン酸及びTGF−β1量を有意に低下させ、組織的にも肝線維化を明確に抑制しており、肝線維化抑制剤として有用であることがわかる。また表1より、肝障害のマーカーであるアルカリホスファターゼ値を有意に改善しており、慢性肝炎の症状も改善していることが明らかである。 As is apparent from FIGS. 1, 2, 3 and 4, polaprezinc was administered in 10 weeks after the start of thioacetamide administration, but the amount of hydroxyproline, a marker of hepatic fibrosis, hyaluronic acid and TGF-beta 1 weight significantly decreased, organized to also clearly inhibited hepatic fibrosis, prove useful as a hepatic fibrosis inhibitor. In addition, it is clear from Table 1 that the alkaline phosphatase level, which is a marker of liver damage, is significantly improved, and the symptoms of chronic hepatitis are also improved.
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