化疗药诱导颊癌细胞凋亡的原位组织学研究

In situ histological study on apoptosis of buccal carcinoma cells induced by anticancer agents

目的 :探讨化疗药诱导颊癌细胞凋亡及其相关机制。方法 :选择临床行术前化疗患者的颊癌组织进行原位DNA末端标记 (TUNEL法 )显示凋亡细胞以及免疫组化SP法检测Fas蛋白的表达。结果 :凋亡细胞及凋亡小体散在分布于颊癌组织中 ,化疗后颊癌凋亡细胞发生率增加 ,凋亡指数 (AI)均值为 0 .91,明显高于化疗前AI( 0 .38) (P <0 .0 1) ;与化疗前相比 ,化疗后颊癌细胞Fas表达强度增加 (P <0 .0 1)。结论 :细胞凋亡途径可能是化疗药杀灭颊癌细胞的重要机制 ,Fas系统在化疗药诱导颊癌细胞凋亡发生中发挥关键性作用。由此 ,应用凋亡诱导分子FasL有可能成为一种新的抗癌方法。

?Objective:To study apoptosis and apoptotic mechanisms of buccal carcinoma cells(BCCs) induced by anticancer agents.Methods:34 cases of buccal carcinoma were treated with pinyangmycin or pinyangmycin combined with other anticancer agents.The samples of the lesions were examined by in situ terminal deoxynucleotidyl transferase (TDT) mediated dUTP nick end labeling (TUNEL) before and after chemotherapy.Apoptotic cells were detected in parraffin embedded buccal cancer specimens from the patients.Apoptotic index (AI) were respectively quantified in prechemotherapy and postchemotherapy specimens of each patient.Fas expression was examined by SP immunohistochemical staining in each specimen.Results:The mean of AI in the samples of prechemotherapy and in those of postchemotherapy were 0.38 and 0.91 ( P <0.01),the gray level of Fas were 156.45±7.99 and 163.50±6.60 ( P <0.01),respectively.Conclusion:Apoptosis may be the important mechanisms of BCCs killed by anticancer agents;Fas/FasL system may play a key role in the process of apoptosis induced by anticancer agents.