过氧化物酶体通路氧化应激基因与青蒿琥酯抗胰腺癌敏感性的相关性研究

目的：探讨过氧化物酶体通路活性氧氧化应激关键基因的筛选及其与青蒿琥酯抗胰腺癌敏感性的相关性。方法基于美国国立癌症研究所（NCI）公共数据库55株肿瘤细胞表达谱基因芯片数据，采用 Kendall 相关分析方法筛选出与青蒿琥酯抗肿瘤半抑制浓度（IC50）显著相关的过氧化物酶体通路关键基因。利用荧光定量 PCR 验证候选基因在不同青蒿琥酯敏感性胰腺癌细胞的 mRNA 表达差异，并通过 DAB 染色检测胰腺癌细胞内过氧化物酶体含量。结果13个过氧化物酶体生物合成、增殖及其活性氧氧化应激通路关键基因 mRNA 表达与青蒿琥酯抗肿瘤药敏浓度 IC50有显著相关性。与正常肝细胞 HL-7702（1．00）比较，对青蒿琥酯敏感的胰腺癌 Panc-1细胞过氧化物酶体生物合成基因CRAT（2．89±0．06）、PEX11B（1．90±0．07）、PEX16（1．35±0．07）mRNA 相对表达水平均显著增高（t ＝33．00，P ＜0．01；t ＝17．85，P ＜0．01；t ＝4．54，P ＜0．05）；其活性氧氧化应激的抗氧化基因 CAT（1．43±0．03）、SOD1（2．07±0．04）、SOD2（1．15±0．01）mRNA 相对表达水平亦显著增高（t ＝11．71，P ＜0．01；t ＝35．85，P ＜0．01；t ＝13．22，P ＜0．01）；对青蒿琥酯不敏感的胰腺癌 BXPC-3细胞的 PEX12（0．51±0．02）、CAT（0．47±0．02）、PRDX1（0．43±0．01）、SOD1（0．44±0．01）mRNA 相对表达水平显著低于正常肝细胞 HL-7702（t ＝37．53，P ＜0．01；t ＝16．52，P ＜0．01；t ＝84．20，P ＜0．01，t ＝48．24，P ＜0．01）。DAB 染色显示对青蒿琥酯敏感的胰腺癌 Panc-1细胞过氧化物酶体阳性表达率（61．5％）明显高于HL-7702细胞（43．8％），差异有统计学意义（χ2＝16．11，P ＜0．01）。结论过氧化物酶体及其活性氧相关抗氧化酶 CAT、PRDX1、SOD 基因表达可能是影响青蒿琥酯抗胰腺癌作用敏感性的重要因素。

Correlation of peroxisome pathway reactive oxygen species oxidative stress gene and its correlation with the antitumor sensitivity of artesunate against pancreatic cancer

Objective To explore the screening of peroxisome pathway reactive oxygen species (ROS) oxidative stress gene and its correlation with the antitumor sensitivity of artesunate against pancreatic cancer. Methods Based on microarray mRNA expressions of 55 tumor cell lines in the National Cancer Institute common database,peroxisome pathway-related key genes which were significant correlation with half-inhibitory concentration (IC50 )values of artesunate antitumor activity against human pancreatic cancer were selected by Kendall test.The candidate genes associated with artesunate sensitivity were identified and their mRNA expressions in pancreatic cancer cells were tested using fluorescent quantitative PCR.The contents of peroxi-dase in pancreatic cancer cells were detected through the DAB staining.Results Thirteen key genes mRNA expressions in peroxidase pathways were significantly correlated with IC50 values for artesunate antitumor activi-ty.Compared with normal liver cells HL-7702 (1.00),CRAT (2.89 ±0.06),PEX11B (1.90 ±0.07)and PEX16 (1.35 ±0.07)mRNA expression levels were significantly increased in pancreatic cancer Panc-1 cells which sensitive to artesunate (t =33.00,P <0.01;t =17.85,P <0.01;t =4.54,P <0.05).While CAT
(1.43 ±0.03),SOD1 (2.07 ±0.04)and SOD2 (1.15 ±0.01)mRNA expression levels were also signifi-cantly increased in Panc-1 cells which sensitive to artesunate (t =11.71,P <0.01;t =35.85,P <0.01;t =13.22,P <0.01).However,PEX12 (0.51 ±0.02),CAT (0.47 ±0.02),PRDX1 (0.43 ±0.01),and SOD1 (0.44 ±0.01)mRNA expression levels in pancreatic cancer BXPC-3 cells which resistant to artesunate were significantly lower than that of HL-7702 cells (t =37.53,P <0.01;t =16.52,P <0.01;t =84.20, P <0.01;t =48.24,P <0.01).DAB staining showed that the positive expression rate of peroxisomal content was apparently higher in Panc-1 cells (61.5%)than that of HL-7702 cells (43.8%),with a significant difference (χ2 =16.11,P <0.01).Conclusion Peroxisome and its related ROS antioxidant enzymes CAT, PRDX1,SOD gene expression may be the important factors that affect artesunate antitumor activity against human pancreatic cancer.