PLoS ONE:肖小河等证实中医辨证用药可降低大黄毒性
2012-03-23 MedSci MedSci原创
近日,国际著名杂志PLoS ONE在线发表了解放军第三〇二医院中西医结合中心暨全军中医药研究所肖小河研究员和王伽伯博士等研究团队的最新研究成果,研究者基于“有故无殒,亦无殒”思想的中药安全性评价新思路与新模式的研究文章。该研究以四大常用药之一的大黄为研究对象,实验论证了“有毒”中药大黄肝肾毒性的客观真实性,以及中药辨证(病)用药减毒的客观真实性,为科学评价与指导“有毒”中药临床合理用药,提供了新的
近日,国际著名杂志PLoS ONE在线发表了解放军第三〇二医院中西医结合中心暨全军中医药研究所肖小河研究员和王伽伯博士等研究团队的最新研究成果,研究者基于“有故无殒,亦无殒”思想的中药安全性评价新思路与新模式的研究文章。该研究以四大常用药之一的大黄为研究对象,实验论证了“有毒”中药大黄肝肾毒性的客观真实性,以及中药辨证(病)用药减毒的客观真实性,为科学评价与指导“有毒”中药临床合理用药,提供了新的研究视角和技术手段。该研究得到国家自然科学基金等的资助。
近年来,中药不良反应报道引起了国际社会对中药安全性的担忧,也为中医药走向国际蒙上了一层阴影。大黄是四大常用中药之一,广泛用于肝炎、肾炎、便秘、肥胖症等,但曾一度被国外热炒有肝毒性、肾毒性和潜在的致癌性,大黄及相关中成药临床应用的安全性受到质疑。
针对国内外的质疑和担忧,课题组以大黄主流品种—掌叶大黄(Rheum palmatum L.)为代表,在常规药理毒理学实验基础上,创建了基于病证模型动物的中药量-毒(效)关系与辩证(病)用药减毒评价模式和方法,揭示大黄治疗肝炎的“量-时-毒-效”关系及治疗窗。研究表明,长时间(>12周)超大剂量(折算人用剂量>150克/日)使用生大黄,会对正常动物造成一定的肝损伤,但停药后毒性反应是可逆的;熟大黄的肝损伤作用不明显。特别值得一提的是,肝损伤模型动物对大黄的耐受性约为正常动物的4倍,而造成这一现象的主要机制是肝损伤动物对大黄中所含蒽醌类重要成分的组织分布和代谢特征与正常动物不同:一方面肝损伤模型动物的肝、肾组织中的大黄酸(rhein)、芦荟大黄素(aloe-emodin)、大黄素(emodin)浓度显著低于正常动物,另一方面肝损伤模型动物的肝组织将其他蒽醌成分转化代谢为肝肾毒性相对较大的大黄酸的能力显著低于正常动物肝组织,因此肝损伤模型动物反而不易发生肝肾毒性。这一发现印证了清代张锡纯《医学衷中参西录》所载“大黄之力虽猛,然有病则病当之,恒有多用不妨者”之说,也证实了《黄帝内经·素问》“有故无殒,亦无殒”之论断。上述研究提示了中医通过辩证(病)用药,合理制订用药剂量和使用周期,是可以达到减(避)毒增(存)效的。)
doi:10.1371/journal.pone.0024498
Hepatotoxicity or Hepatoprotection? Pattern Recognition for the Paradoxical Effect of the Chinese Herb Rheum palmatum L. in Treating Rat Liver Injury
Jia-bo Wang1#*, Hai-ping Zhao1,2#, Yan-ling Zhao1, Cheng Jin1, Dao-jian Liu1, Wei-jun Kong1,3, Fang Fang1,3, Lin Zhang1,3, Hong-juan Wang1, Xiao-he Xiao1
The hepatotoxicity of some Chinese herbs has been a cause for concern in recent years. However, some herbs, such as rhubarb, have been documented as having both therapeutic and toxic effects on the liver, leading to the complex problem of distinguishing the benefits from the risks of using this herb. To comparatively analyze the dose-response relationship between rhubarb and hepatic health, we administrated total rhubarb extract(RE) to normal and carbon tetrachloride(CCl4)-treated rats for 12 weeks at 4 dosage levels(2.00, 5.40, 14.69 and 40.00 g·kg−1, measured as the quantity of crude material), followed by biochemical and histopathological tests of the rats' livers. A composite pattern was extracted by factor analysis, using all the biochemical indices as variables, into a visual representation of two mathematically obtained factors, which could be interpreted as the fibrosis factor and the cellular injury factor, according to the values of the variable loadings. The curative effect of administering the two lowest dosages of RE to CCl4-treated rats was mainly expressed as a decrease in the extent of cellular injury. The hepatoprotective mechanism of RE might be related to its antioxidant effect, the antagonism of the free radical damage to hepatocytes caused by CCl4. By contrast, the RE-induced liver damage was mainly expressed as a significant increase in the amount of fibrosis in both normal rats at all dosage levels and CCl4-treated rats at the two highest dosage levels. Therefore, the hepatotoxic potential of RE could be attributable to the liver cell fibrosis induced by high doses of the herb. 1This study illustrates the bidirectional potential of rhubarb and demonstrates the feasibility of using factor analysis to study the dose-response relationships between herbal medicines and hepatotoxicity or the healing effects of these herbs by extracting the underlying interrelationships among a number of functional bio-indices in a holistic manner.
本网站所有内容来源注明为“梅斯医学”或“MedSci原创”的文字、图片和音视频资料,版权均属于梅斯医学所有。非经授权,任何媒体、网站或个人不得转载,授权转载时须注明来源为“梅斯医学”。其它来源的文章系转载文章,或“梅斯号”自媒体发布的文章,仅系出于传递更多信息之目的,本站仅负责审核内容合规,其内容不代表本站立场,本站不负责内容的准确性和版权。如果存在侵权、或不希望被转载的媒体或个人可与我们联系,我们将立即进行删除处理。
在此留言
发展传统医药事业
82
发展传统医药事业
115
发展传统医药事业
120
发展传统医药事业
120
发展传统医药事业
145
发展传统医药事业
142
发展传统医药事业
108
发展传统医药事业
190
发展传统医药事业
198
发展传统医药事业
115