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RGS20基因在Luminal型乳腺癌的表达及临床病理特征相关性研究

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[摘要] 目的 探讨rgs20基因表达与Luminal型乳腺癌临床病理特征的关系。 方法 利用癌症基因组图谱数据库(TCGA数据库)筛选出1023例乳腺癌病例和98例癌旁对照样本,收集RGS20基因表达谱资料和临床信息资料,分析RGS20基因表达与乳腺癌临床病理特征的相关性及对预后的影响。结果 RGS20基因在不同乳腺癌分子分型中存在明显的表达差异,其中在luminal乳腺癌为低表达,而在三阴性乳腺癌中为高表达。同时在Luminal型乳腺癌中,对RGS20基因表达水平与其临床病理特征进行分析,发现RGS20基因表达水平与人种存在相关性(P

[关键词] RGS20;乳腺癌;Luminal型乳腺癌;临床病理特征

[中图分类号] R737.9 [文献标识码] A [文章编号] 1673-9701(2016)36-0021-05

[Abstract] Objective To study the relationship between RGS20 gene expression and clinicopathological features of Luminal breast cancer, since the relationship between RGS20 and clinicopathological features of Luminal type breast cancer is not studied so far. Methods RGS20 gene expression and clinical information were collected by screening 1023 cases of breast cancer patients and 98 cases of paracancerous tissue samples in TCGA database. The correlation between RGS20 gene expression and clinicopathological features and prognosis of breast cancer was analyzed. Results The expression levels of RGS20 gene were significantly different in different molecular types of breast cancer, which was low in Luminal type breast cancer and high in triple negative breast cancer. the expression level of RGS20 gene and its clinicopathological features were analyzed in Luminal type breast cancer. The expression level of RGS20 gene was found statistically correlated with human race(P

[Key words] RGS20; Breast cancer; Luminal type breast cancer; Clinicopathological features

乳腺癌是一N复杂异质性疾病,在组织学形态、细胞起源、突变、转移、疾病分级、治疗反应性及临床表现等方面均有不同[1]。基于乳腺癌达分子表型,乳腺癌一般被分为3种亚型:Luminal型,Her-2多表达型,三阴性型乳腺癌。Luminal型乳腺癌是指雌激素受体阳性乳腺癌,约占所有乳腺癌的2/3。Lumina乳腺癌往往形态学上分化较好,与其它类型相比预后较好。

G蛋白信号调节蛋白(RGS蛋白)是一种Gα亚基GTP酶活性增敏剂,能使GTP酶活性增加100倍,突然中断G蛋白信号,并对G蛋白耦联受体(GPCRs)的生物学特征产生显著的影响。G蛋白偶联受体(GPCRS)家族是一种细胞表面受体,多项证据证明改变GPCRS的表达水平和活性能够调节多种细胞功能比如细胞增殖、存活能力、运动性和肿瘤的生长、血管生成和转移。RGS蛋白和GPCRS的结合具有高度选择性,产生完全不同的分子作用。RGS蛋白在卵巢癌、前列腺癌、肺癌、乳腺癌等多种肿瘤中都有不同程度的表达,并作为一种致癌信号在肿瘤的发生和发展中起到重要作用,至少有6种RGS蛋白(RGS2、4、10、16、17、19)参加细胞增殖调节[2-5]。RGS20同属于RZ/A家族,氨基末端区富含一串与膜附着有关的半胱氨酸基序,在大脑中高表达,尤其是尾状核和颞叶。RGS20通常被认为是Gαz选择性GTP酶激活蛋白,同时也可以与Gαi亚基相互作用从而削弱细胞信号传递。RGS20自身并没有致癌潜能,但是在小鼠胚胎成纤维细胞(NIH3T3)它通过增加致癌性的Rasgv引导肿瘤病灶形成,调节细胞聚集,运动性和侵袭能力促进细胞转移。同时,RGS20在转移黑色素瘤和转移乳腺癌中高表达[6-8]。

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