Notch1、Notch3及Hes1在胃肠道间质瘤中的表达及临床意义

目的 探讨胃肠道间质瘤(GIST)患者肿瘤组织中Notch信号通路相关蛋白Notch1、Notch3及Hes1表达水平及临床意义.方法 采用实时定量PCR (Q-PCR)和Western blot方法检测135例新鲜GIST标本及临近非肿瘤组织中Notch1、Notch3及Hes1 mRNA和蛋白表达情况.同时采用免疫组织化学方法检测Notch1、Notch3及Hes1蛋白表达情况,并分析各蛋白表达与GIST患者临床病理因素的关系.另将野生型小鼠(WT)和Notch1基因敲除小鼠(KO) 40只,分为WT组、KO组、WT+ GIST组和KO+GIST组,检测各组Notch1、Notch3及Hes1蛋白表达情况.结果 与临近非肿瘤组织相比,GIST组织中Notch1、Notch3及Hes1 mRNA和蛋白表达均上调(P＜0.05).GIST标本的Notch1、Notch3、Hes1阳性率(5926％、65.19％、62.22％)均高于临近非肿瘤组织(17.78％、22.22％、17.78％),差异有统计学意义(P＜0.05).统计分析证实Notch1蛋白表达与GIST的NIH分级密切相关(x2=8.532,P=0.002);Notch3蛋白表达与GIST的肿瘤转移密切相关(x2=7.532,P=0.003);Hes1蛋白表达与GIST的肿瘤大小密切相关(x2=6.781,P=0.012).各组小鼠Notch1、Notch3及Hes1蛋白表达情况显示,与WT组相比,WT+ GIST组小鼠体内3种蛋白表达升高(P＜0.05);与KO组相比,KO+GIST组小鼠体内3种蛋白表达无明显变化(P＞0.05);与WT+ GIST组相比,KO+ GIST组小鼠体内3种蛋白表达降低(P＜0.05).结论 Notch信号通路相关蛋白Notch1、Notch3及Hes1在GIST患者组织中表达升高,Notch信号通路的激活可能在GIST发生、发展过程中起重要作用.

Expression of Notch1, Notch3 and Hes1 in gastrointestinal stromal tumors and their clinical significance

Objective To investigate the expression of Notch1,Notch3 and Hes1 in gastrointestinal stromal tumors(GIST) and their clinical significance.Methods Quantitative real-time polymerase chain-reaction(Q-PCR) and Western blot were applied to detect the mRNA and the expression of Notch1,Notch3 and Hes1 in 135 matched GIST specimens and adjacent tissues.Meanwhile,the expression of Notch1,Notch3 and Hes1 was detected by immunohistochemistry,and the relationship between their expression and clinicopathological factors in GIST patients was analyzed.In addition,a total of 40 wild type mice(WT) and Notch1 knockout mice(KO) was divided into WT group,KO group,WT+ GIST group and KO+GIST group,and the expression of Notch1,Notch3 and Hes1 in each group was detected.Results Compared with adjacent tissues,the mRNA andthe expression of Notch1,Notch3 and Hes1 were up-regulated in GIST tissues(P＜0.05).The positive rates of Notch1,Notch3 and Hes1 in the GIST specimens (59.26 ％,65.19 ％ and 62.22 ％) were higher than those in the adjacent tissues(17.780％,22.22 ％ and 17.78 ％),and the difference was statistically significant(P＜0.05).Statistical analysis showed that the expression of Notch1 was significantly correlated with the NIH grade of GIST(x2 =8.532,P=0.002);the expression of Notch3 was significantly related with tumor metastasis of GIST (x2 =7.532,P=0.003);the expression of Hes1 was significantly associated with the tumor size of GIST(x2 =6.781,P=0.012).The expression of Notch1,Notch3 and Hes1 was higher in WT+GIST group compared to the expression found in WT group(all P＜0.05).There were no significant differences in the expression of Notch1,Notch3 and Hes1 between WT+ GIST group and KO+GIST group.The expression of Notch1,Notch3 and Hes1 was lower in KO+ GIST group compared to the expression found in WT+GIST group(all P＜0.05).Conclusion The expression of Notch1,Notch3 and Hes1 related to Notch signaling pathway is elevated in GIST tissues,and the activation of Notch signaling pathway may play an important role in the occurrence and progression of GIST.