In vitro and in vivo immunomodulating and immunorestorative effects of Astragalus membranaceus

Journal of Ethnopharmacology
William C S Cho, Kwok Nam Leung


Astragalus membranaceus is a common traditional Chinese medicinal plant widely used as a tonic to enhance the body's natural defense mechanisms. In this study, bioactive fractions were isolated from the roots of Astragalus membranaceus. One of these fractions, designated as AI, was found to be the most potent with respect to its mitogenicity on murine splenocytes. Effects of AI on both specific and nonspecific immunity in mouse models were examined. Results showed that AI could exhibit mitogenic and co-mitogenic activities on mouse splenocytes, both in vitro and in vivo. Experiments in human cell culture demonstrated that AI was also active on human lymphocytes. It was found that AI was mitogenic to T cell depleted population but virtually inactive on B cell depleted population. Intraperitoneal injection of AI into mice markedly augmented the antibody response to sheep red blood cells. Besides, both the influx of macrophages into the peritoneal cavity and the phagocytic activity of macrophages were found to be enhanced by AI in vivo. On the other hand, AI could significantly increase the interleukin-2 receptor expression on mouse splenocytes in vitro. In terms of immunorestorative activity, it was found that AI could restore th...Continue Reading


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