葡萄糖转运蛋白在非小细胞肺癌中的表达及其临床意义

目的：探讨葡萄糖转运蛋白（Glucose transporter，Glut）的两种异构体Glutl、Glut3及缺氧诱导因子-1（Hypoxia induciblefactor-1，HIF-1）的亚基HIF—1α，在非小细胞肺癌中的表达及临床意义。方法：选取34例手术切除非小细胞肺癌（包括癌组织和癌旁组织）和17例肺良性病变标本，用免疫组织化学法测定Glutl、Glut3及HIF-1α在肺组织中的表达；用RT—PCR半定量检测Glutl、Glut3及HIF-1α的mRNA表达；用Western Blot检测Glutl、Glut3及HIF-1α蛋白的表达，并测两者相关性。结果：Glutl、Glut3及HIF-1α在肺癌组织中mRNA相对含量为0．689±0．245、0．506±0．246、0．693±0．248，对应癌旁组织为0．338±0．157、0．482±0．238、0．351±0．184，Glutl和HIF-1α在肺癌组织中显著升高（P〈0．001），而Glut3差别无显著性（P〉0．05）。Glutl、Glut3、HIF—1α在癌组织中蛋白相对含量为0．582±0．247、0．551±0．251、0．525±0．246，癌旁组织为0．288±0．151、0．436±0．224、0．261±0．135，在肺良性病变中为0．291±0．142、0．402±0．206、0．271±0．176，Glutl和HIF-1α在癌组织中的表达均明显高于癌旁组织（P〈0．001）和肺良性病变组织（P〈0．001）；而Glut3差别无显著性（P〉0．05）。Glutl和HIF-1α在低分化组明显高于中高分化组（P〈0．05），Ⅲ期明显高于Ⅰ和Ⅱ期（P〈0．05），且HIF-1α的表达与Glutl明显相关（r=0．854，P〈0．01）。结论：在非小细胞肺癌中，Glutl和HIF-1a存在高表达，其表达与细胞分化程度、TNM分期密切相关，且Glutl和HIF-1α具有相关性。

Expression of glucose transporter in non-small cell lung carcinoma and its clinical significance

OBJECTIVE: To investigate the expression of glucose transporter (Glut)1, Glut3, and hypoxia inducible factor (HIF)-1 alpha in human non-small cell lung carcinoma (NSCLC), and its clinical significance. METHODS: Specimens of cancer tissues and paracancerous lung tissues from 34 cases of NSCLC and 17 specimens of benign lung lesions were collected. The expressions of Glut1, Glut3, and HIF-1 alpha were detected with immunohistochemical staining, RT-PCR, and Western blot. RESULT: The relative mRNA expressions of Glut1 and HIF-1 alpha were 0.689 +/-0.245, 0.693 +/-0.248 in cancer tissues; and 0.338 +/-0.157, 0.351 +/-0.184 in paracancerous lung tissues (P <0.001); while those of Glut3 were 0.506 +/-0.246 in cancer tissues and 0.482 +/-0.238 in paracancerous tissues (P >0.05). The relative protein expressions of Glut1 and HIF-1 alpha were 0.582 +/-0.247, 0.525 +/-0.246 in cancer tissues and 0.288 +/-0.151, 0.261 +/-0.135 in paracancerous lung tissues (P<0.001), but the protein expressions of Glut3 were 0.551 +/-0.251 and 0.436 +/-0.224 respectively (P>0.05). Glut1 and HIF-1 alpha expressions were higher in poor differentiation group and in stage III group, than those in medium and well differentiation group and stage I and II group. Moreover, there was a significant correlation between the expression of Glut1 and HIF-1 alpha (r=0.854, P<0.01). CONCLUSION: Glut1 and HIF-1 alpha are highly expressed in NSCLC, and their expressions are associated with tumor differentiation and clinical stage.