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Background  Large dose application of traditional Chinese medicines has attracted more and more attentions in recent years. However, the scientific connotation of large dose application has not been clarified so far. The present study was designed to investigate the protective effects of Chi-Dan-Tui-Huang decoction (CDTHD) against Alpha-naphthylisothiocyanate (ANIT) induced acute cholestatic hepatitis in rats and explore the dose-effect relationship of CDTHD as a reference for clinical application.    Methods  The administration of CDTHD at a series of doses was performed twice each day for 5 days. The acute cholestasic hepatitis models were induced by intragastric administration of ANIT on the third day of CDTHD administration. Then, the protective effects on cholestatic hepatitis were investigated by examining the following parameters: body weights of rats, morphological and histopathological liver changes, the levels of serum biomarkers including alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase, total bilirubin, direct bilirubin and γ-glutamyltranspeptidase. Furthermore, the dose-effect relationship was investigated with the application of correspondence analysis.    Result  In the tested range of doses, CDTHD at the maximum tolerance dose did not show any toxicity as time went on. The efficacy result showed that CDTHD from 21.6 g/kg⋅d to 86.4 g/kg⋅d exhibited significant hepatoprotective effect against ANIT-induced acute cholestatic hepatitis. It alleviated liver injury and reversed adverse biochemical and histopathological changes in a dose-dependent manner. Correspondence analysis showed that  Radix Paeoniae  Rubra in CDTHD was the main effective component and CDTHD could enhance the integrated efficacy in dose-dependent manner.    Conclusions  CDTHD is beneficial to liver protection in a dose-dependent manner. Especially large dose demonstrates potent efficacy and  Radix Paeoniae  Rubra in the formula contributes the main effect on ANIT-induced acute cholestatic hepatitis without toxicity.

bmc complementary and alternative medicine

Large dose means significant effect – dose and effect relationship of Chi-Dan-Tui-Huang decoction on alpha-naphthylisothiocyanate-induced cholestatic hepatitis in rats