篩選可抑制活化人類腎膈細胞以治療 IgA 腎炎之冬蟲夏草純化天然物
林清淵
台北榮民總
IgA 腎炎 (IgA nephropathy) 臨床上以陣發性血尿及/或蛋白尿表現,國人於罹患本症後約 20% 其病程會逐漸進行至尿毒症,迄今尚無證實有任何結構之藥劑可阻止疾病之進行,而在國人腎絲球炎中約 30% 為 IgA 腎炎,故尋找治療藥對國人而言為十分重要之課題。
過去吾人之研究室已建立離體人類腎膈細胞之培養方法、人類腎膈細胞活化後會放出細胞激素及傷害腎基底膜之化學物質之離體模式,並建立 IgA 腎炎之動物模式。因此吾人以抑制離體活化之腎膈細胞為離體篩選系統,以 IgA 腎炎之動物模式為體內測試系統,並通過急毒試驗,從冬蟲夏草中分離出之『活性組成』F-2,在體外可抑制活化之腎膈細胞增生,以阻斷往後造成腎傷害之步驟的進行,在體內可阻止 IgA 腎炎惡化,並改善血尿/蛋白尿,且 F-2 並不會產生急性毒性。接著吾人由自 F-2 中分離出一活性成份 (pure compound) H1-A(已獲? 痚磥峎穇M利),計算從 F-2 中所純化出來之活性天然 H1-A 成份之 50% 生長抑制值 (GI50,growth inhibition 50) 為 40 微莫耳 (μM)。H1-A 仍具有抑制活化之腎膈細胞增生之功能及改善 IgA 腎炎動物模式之血尿/蛋白尿、組織學變化,但是計算 H1-A 佔 F-2 對活化之腎膈細? M增生之抑制 unit 只佔 40%,表示尚有其他有效成份。
故本計畫吾人擬進一步仔細探討 H1-A 之體內動物模式 IgA 腎炎之療效、毒性等藥理作用。二方面吾人擬先探討 H1-A 是否具 cytotoxicity 或 apoptosis 之作用,再進一步由北方吸漬法看末稍血液淋巴球受 PHA 刺激並加入 H1-A 後對 IL-2 mRNA 之作用為何。接著再繼續以免疫學及分子生物學的方法探討 H1-A 之免疫抑制機制,當吾人對 H1-A 之藥理作用及免疫抑制作用有了進一步了解,將有助於將來應用於臨床治療,並建立中藥科學研究之模式。
故本計畫吾人擬繼續以現有之抽取方法略加改良及體內 IgA 腎炎之動物模式,繼續自 F-2 中抽取其他具有可抑制活化之腎膈細胞增生活性之單純天然物 (pure compound),並探討這些單純天然物之結構式,對體內動物模式 IgA 腎炎之療效、毒性等。以上研究將? 釦U於未來應用於臨床治療,並建立中藥科學研究之模式。
關鍵字:IgA 腎炎、冬蟲夏草、第二介白質
Screening of bioactive pure natural products from Cordyceps sinensis to inhibit the activating human mesangial cells for the treatment of IgA mesangial nephropathy
Ching-Yuang Lin
Veterans General Hospital-Taipei
Clinically, IgA nephropathy presents as paroxysmal hematuria and/or proteinuria, and it always runs a chronic course. The disease gradually progresses to uremia in 20% of adult patients in Taiwan. To date, no therapeutic agent has been shown to stop its progression. Hence there is a pressing need for development of a curative substance.
Cordyceps sinensis (CS) is a parasitic fungus which has been used as a Chinese medicine for a long time in the treatment of nephritis. Today, the hypothesis about the pathogenesis of IgA nephropathy (IgAN) is that nephritogenic IgA -immune complexes (IgA-IC) go to the kidney to stimulate resting mesangial cell (MC) to release cytokines and growth factors (GFs). These cytokines and GFs cause MC proliferation & release matrix, chemical mediators which lead to the glomerular injury. However, nephritogenic IgA-IC in humans is still unknown. To solve this problem previously, we established an in vitro model that cultured human MC stimulated with IL-1 plus I
關鍵字:IgA mesanigal nephropathy, Cordyceps sinensis, Interleukin-2