Vinca alkaloids such as vincristine are chemotherapeutic agents that are used for the treatment of choriocarcinoma as a part of the mechlorethamine/Oncovin/procarbazine/prednisone regimen. Vincristine’s mechanism of action makes the drug specific for which phase of the cell cycle?
长春花生物碱,如长春新碱,是用于治疗绒毛膜癌的非治疗药物,作为氯胺酮/长春新碱/甲苄肼/强的松方案的一部分。长春新碱的作用机制使药物对细胞周期的哪个阶段有特异性?
(A) G0 phase
(B) G1 phase
(C) G2 phase
(D) M phase
(E) S phase
答案解析:
长春新碱和其他长春花生物碱阻断微管的聚合,从而阻止有丝分裂纺锤体的形成。有丝分裂纺锤体是有丝分裂所必需的;因此,长春新碱对M期具有特异性。
正确答案:D
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