【摘要】 甲硫氨酸(M et)依赖性是肿瘤代谢缺陷的重要特征之一。近年来,从分子水平对肿瘤细胞的M et依赖性进行一系列研究,发现了M et代谢的关键酶功能异常(如M et合成酶单核苷酸多态性,甲基硫腺苷磷酸酶基因缺失,胸苷合成酶蛋白表达下降,甲叉四氢叶酸还原酶基因表达上调)。细胞内信号转导障碍是M et限制导致肿瘤细胞凋亡的另一分子机制。更多还原

【Abstract】 Methionine dependence is one of characteristic metabolism deficiency in cancer cells.Recently a series of researches focusing on key enzymes of methionine metabolism demonstrated that several molecular events might relate with cancer cell methionine dependence(i.e.,methionine synthasesingle nucleotide polymorphism,methythioadenosine phophorylasegene deletion,down regulation of thymidylate synthase translation;up regulation of methylenetetrahydrofolate reductase expression).Cell apoptosis induced by intracellular signal transduction dysfunction might be another potential mechanism.更多还原