ABSTRACT
OBJECTIVE To explore the immunity-enhancing effect of ABP-AW1, a low-molecular-mass polysaccharides isolated from Agaricus blazei Murill, on immunosuppressive mice. METHODS ICR mice were ip injected cyclophosphamide 80 mg · kg-1, once daily for 3 d, to establish an immuno?suppressive mouse model. Then, ABP-AW1125, 250 and 500 mg · kg-1 were ig given to the immuno?suppressive mice,respectively, once daily for 7 d. The mouse thymus index and spleen index were calcu?lated, and the phagocytic function of phagocytes was determined using carbon clearance test. Splenic lym?phocyte proliferation was measured by MTT method. The interleukin 2 (IL-2) and interferon γ (IFN-γ) production from splenic lymphocytes was examined by ELISA. The splenic lymphocyte CD4+/CD8+ratio was determined by flow cytometric analysis. RESULTS Compared with normal control group, the thymus index, spleen index and phagocytic index of phagocytes in the immunosuppressive model mice declined (P<0.05). ABP-AW1250 and 500 mg·kg-1 treatment significantly increased the thymus index, spleen index and phagocytic index in immunosuppressive mice (P<0.05). Compared with normal control group, concanavalin A (Con A) and lipopolysaccharide (LPS) induced T and B lymphocyte proliferation, respectively, and IL-2 and IFN-γproduction from splenic lymphocytes in the immunosuppressive model mice was lower (P<0.05). Compared with model group, ABP-AW1250 and 500 mg·kg-1 promoted Con A and LPS induced T and B lymphocyte proliferation (P<0.05) , and elevated IL-2 and IFN-γ production from splenic lymphocytes (P<0.05). In addition, ABP-AW1250 and 500 mg·kg-1 reversed the decreased splenocyte CD4+/CD8+ratio in immunosuppressive model mice (P<0.05). CONCLUSION ABP-AW1 has immuneity-enhancing effect on cyclophosphamide-induced immunosuppressive mice.