放化疗抵抗的胰腺癌细胞中干细胞标志物的表达

目的 观察放化疗抵抗的胰腺癌细胞的Bcl-2、survivin及干细胞标志物Oct-4、ABCG2蛋白表达的变化,探讨这部分肿瘤细胞耐受放化疗的原因.方法 采用同步放化疗干预人胰腺癌细胞系SW1990、BxPC3、pc3、jr305,获得放化疗抵抗的胰腺癌细胞,以不行放化疗处理的细胞作为对照.采用Western blotting检测它们的Bcl-2、survivin、Oct-4和ABCG2蛋白的表达变化.结果 放化疗抵抗的SW1990、BxPC3、pc3、jt305胰腺癌细胞Bcl-2蛋白表达量分别为0.7955±0.0326、0.5718±0.0212、0.6137±0.0382和0.8733±0.0461;survivin蛋白表达量分别为0.8207±0.0490、0.6973±0.021 1、0.7967±0.0346和0.8013±0.0398;Oct-4蛋白表达量分别为0.8728±0.0177、0.7861±0.0139、0.4794±0.0932和0.4216±0.1043;ABCG2蛋白表达量分别为0.7810±0.1370、0.4957±0.1126、0.6102±0.1358和0.4670±0.1274.对照组相应细胞系的4种蛋白表达量分别为0.4723±0.018、0.2954±0.0103、0.3587±0.0201和0.2718±0.0136;0.4717±0.0274、0.3587±0.0113、0.3891±0.0147和0.3326±0.0124;0.6053±0.0142、0.4236±0.0086、0.2385±0.0671和0.1985±0.0582;0.3156±0.0582、0.2360±0.0423、0.2813±0.0512和0.1808±0.0370.放化疗后胰腺癌细胞的4种蛋白表达量均显著增加(P＜0.05).结论 放化疗抵抗的胰腺癌细胞中可能富含肿瘤干细胞.

Expression of stem cell markers in pancreatic cancer cells resistant to chemoradiotherapy

Objective To investigate the expression of Bcl-2,survivin and pancreatic cancer stem cells markers Oct-4 and ABCG2 in pancreatic cancer cells resistance to chemoradiotherapy.and explore its mechanism.Methods Concurrent ehemoradiotherapy was used to obtain pancreatic cancer cells resistant to chemoradiotherapy,the pancreatic cancer cells without chemoradiotherapy treatment were used as control.Western-blot was applied to detect the expression of Bcl-2,survivin,Oct-4,ABCG2.Results The expression of Bcl-2 was 0.7955±0.0326,0.5718±0.0212,0.6137±0.0382 and 0.8733±0.0461,respectively;the expression of survivin protein was 0.8207±0.0490,0.6973±0.0211,0.7967±0.0346 and 0.8013±0.0398,respectively;the expression of Oct-4 protein was 0.8728±0.0177,0.7861±0.0139,0.4794±0.0932 and 0.4216±0.1043,respectively;the expression of ABCG2 protein was 0.7810±0.1370,0.4957±0.1126,0.6102±0.1358 and 0.4670±0.1274,respectively.in resistant pancreatic cancer cells of SW1990,BxPC3,pc3,jf305 cell line.The corresponding values in the control group were 0.4723±0.018,0.2954±0.0103.0.3587±0.0201 and 0.2718±0.0136;0.4717±0.0274,0.3587±0.0113,0.3891±0.0147 and 0.3326±0.0124;0.6053±0.0142,0.4236±0.0086.0.2385±0.0671 and 0.1985±0.0582;0.3156±0.0582.0.2360±0.0423,0.2813±0.0512 and 0.1808±0.a0370.The expression of all the four proteins significantly increased after ehemoradiotherapy(P＜0.05).Conclusions Pancreatic cancer cells resistant to chemoradiotherapy may contain cancer stem cells.