灵芝的抗肿瘤作用机制

Ganoderma lucidum(Leyss．Ex fr．)Karst．(Lingzhi) is a medicinal fungus with a long history in China as a valuable tonic remedy．Modern Pharmacological and clinical investigation demonstrated that Lingzhi had anti-tumor activities．Recently the antitumor effects of extract of Ganoderma lucidum(GLE) and Ganoderma polysaccharides B(GL-B) and its mechanism were investigated．The results demonstrated that GLE and GL-B significantly inhibited growth of implanted sarcoma 180 in vivo．GL-B also promoted anti-tumor activity induced by cyclophosphamide in mice in vivo．GLE and GL-B directly adding to tumor cells-cultured medium neither suppressed sarcoma 180 and HL-60 proliferation nor induced apoptosis of both tumor cells in vitro．However the serum from GLE and GL-B treated mice can suppress S-180 and HL-60 cells proliferation and induced its apoptosis in vitro．Furthermore splenocytes conditioned medium with GL-B (GL-B-S-CM) and peritoneal macrophages conditional medium with GL-B (GL-B-PM-CM) also significantly inhibited HL-60 proliferation and induced its apoptosis in vitro．Further study indicated that GLE and GL-B could promote TNFa production from murine peritoneal macrophages and IFNg production from murine spleen cells in vitro．Finally GLE and GL-B could promote TNFa mRNA expression in murine peritoneal macrophages and IFNg mRNA expression in murine spleen cells．The results suggest that the anti-tumor effect of Ganoderma lucidum relates to activating macrophage and spleen cell，then promoting TNFa mRNA expression and IFNg mRNA expression，finally resulting TNFa and IFNg release．

Ganoderma lucidum is a traditional Chinese medicine, which has been shown to have both an-ti-oxidative and anti-inlfammatory effects, and noticeably decreases both the infarct area and neuronal apoptosis of the ischemic cortex. This study aimed to investigate the protective effects and mechanisms of pretreatment with ganoderma lucidum (by intragastric administration) in cerebral ischemia/reperfusion injury in rats. Our results showed that pretreatment with ganoder-ma lucidum for 3 and 7 days reduced neuronal loss in the hippocampus, diminished the content of malondialdehyde in the hippocampus and serum, decreased the levels of tumor necrosis fac-tor-αand interleukin-8 in the hippocampus, and increased the activity of superoxide dismutase in the hippocampus and serum. hTese results suggest that pretreatment with ganoderma lucidum was protective against cerebral ischemia/reperfusion injury through its anti-oxidative and an-ti-inlfammatory actions.