Abstract
The effects of the Acanthopanax obovatus polysaccharide (AOPS) as well as its combination with cyclophosphamide (CY) or prednisolone on immune responses were investigated in mice. AOPS (250 mg/kg i.p. x 5) increased the spleen weight and the number of spleen cells, and augmented the phagocytosis of peritoneal macrophages both in normal mice and in immunosuppressed mice. In a haemagglutinin assay AOPS increased the production of specific antibodies and antagonized the suppressive effect of CY. AOPS not only enhanced the degree of in vitro spleen cell-mediated red blood cells (SRBC) hemolysis (quantitative hemolysis of SRBC) but also restored the suppressive effect of CY completely. From these results, AOPS was shown to have an enhancing and a modulating activity on immune responses.
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