顺铂耐药人胃癌细胞SGC-7901的耐药特性的研究

目的：研究人胃癌细胞SGC-7901顺铂耐药后的细胞特性的变化。方法用彗星实验( SCGE)观察SGC-7901与胃癌细胞顺铂耐药细胞株( SGC-7901/DDP)的DNA损伤修复的能力,观察SCGE检测图像的尾长评定DNA的修复能力；通过观察胃腺癌 SGC-7901细胞和 SGC-7901/DDP的形态学不同,比较SGC-7901和SGC-7901/DDP自身变化；用细胞划痕的方法检测 SGC-7901/DDP 和 SGC-7901的迁移能力,通过对其迁移能力的观察,初步评价两株肿瘤细胞的侵袭能力；MTT法分别检测临床常用化疗药物5-氟尿嘧啶、依托泊苷、表阿霉素、多西紫杉醇、奥沙利铂对SGC-7901/DDP的敏感性和IC50,观察这些药物对SGC-7901/DDP的敏感性和交叉耐药性。结果人胃腺癌 SGC-7901/DDP 较 SGC-7901的SCGE图像的尾长短,SGC-7901/DDP的DNA损伤修复能力比SGC-7901强,表明顺铂耐药与其DNA损伤修复能力密切相关；SGC-7901/DDP和SGC-7901的形态不同, SGC-7901/DDP SGC-7901体积较小、核分裂较多；通过用细胞划痕的方法观测到SGC-7901/DDP较SGC-7901的迁移能力变差；SGC-7901/DDP对5-氟尿嘧啶、依托泊苷、表阿霉素、多西紫杉醇、奥沙利铂有不同程度的交叉耐药性,其 IC50较SGC-7901明显增加。结论人胃癌细胞 SGC-7901对顺铂耐药可使DNA损伤修复能力增强,并具有多重耐化疗药性,但其细胞的迁移能力减弱。

Characteristics of cisplatin resistance in human gastric cancer cell line SGC-7901

Objective To investigate the characteristics of cisplatin resistance in human gastric cancer cell line SGC-7901 . Methods Single cell gel electrophoresis ( SCGE ) was used to measure the level of DNA damage and repair in gastric cancer cell line SGC-7901 and gastric cancer cisplatin resistance cell line SGC-7901/DDP by ob-serving the tail length. Morphological changes of SGC-7901 and SGC-7901/DDP were recorded to evalutate the differences between the two lines. The degree of migration of SGC-7901/DDP and SGC-7901 measured by cell wound scratch assay was used to estimate the ability of invasion. MTT assay was performed to determine the drug sensitivity, IC50 values and cross-resistance of SGC-7901/DDP treated with 5-FU, VP-16, ADM, TAX and LOHP separately. Results The level of DNA damage and repair in SGC-7901/DDP was higher than that in SGC-7901 ac-cording to the tail length of SCGE tests ,suggesting the relationship between cisplatin resistance and the abiity of DNA damage and repair. There was a much smaller volume in SGC-7901/DDP compared with SGC-7901,and clone aggregation always appeared in SGC-7901/DDP. Cell wound scratch assay showed that the migration of SGC-7901/DDP was weaker than that of SGC-7901. MTT showed the significant increase of IC50 and cross resitance in SGC-7901/DDP compared with SGC-7901 treated with 5-FU, VP-16, ADM, TAX and LOHP simultaneously. Conclu-sion The ability of DNA damage and repair in gastric cancer cisplatin resistance cell line SGC-7901 is enhanced significantly. The SGC-7901/DDP shows a notable promotion on multidrug resistance in vivo, and the migration of SGC-7901/DDP is weaker than that of SGC-7901 .