微小RNA204在人肾透明细胞癌中的表达及临床意义

Expression and clinical significance of microRNA-204 in human renal clear cell carcinoma

目的研究微小RNA204(miR-204)在人肾透明细胞癌(RCCC)中的表达及临床意义。方法收集泌尿外科行手术切除的RCCC及对应癌旁正常肾脏组织标本共65例,运用qRT-PCR技术检测miR-204在RCCC及癌旁组织中的表达水平,统计分析miR-204表达水平与患者临床病理资料间的相关性;采用人工合成的miR-204模拟物转染人RCCCCaki-1细胞,分别采用qRT-PCR及Western-Blot检测转染后miR-204下游潜在靶点Bcl-2及SIRT1 mRNA及蛋白的表达变化。结果miR-204在RCCC组织中表达水平显著低于对应癌旁正常肾组织(P<0.05);miR-204低表达与肿瘤体积增大(>3cm,P<0.05)、肿瘤淋巴结转移(P<0.05)及高TNM分期(Ⅲ+Ⅳ期,P<0.05)显著相关;miR-204转染人RCCCCaki-1细胞后可显著降低细胞内Bcl-2及SIRT1mRNA及蛋白的表达水平(P<0.05)。结论 miR-204在RCCC组织中表达下调并与肿瘤恶性临床病理特征有关,miR-204可能通过下调Bcl-2及SIRT1的表达来抑制RCCC的发生、发展过程。

Objective To inveatigate the expression and clinical significance of microRNA‐204（miR‐204） in human renal clear cell carcinoma（RCCC） .Methods 65 cases of resected RCCC tissue and corresponding normal tumor‐adjacent tissue were col‐lected and detected the expression level of miR‐204 by using qRT‐PCR .The correlation between the miR‐204 expression level and clilicalpathological features was statistically analyzed .The artificial miR‐204 mimics were adopted to stranfect into Caki‐1 cells ,then the Western blot was used to detect the expression of Bcl‐2 a as the downstream potential targets of miR‐204 and SIRT1 mRNA and protein .Results The expression level of miR‐204 in the RCCC tissue was significantly lowere than that in the normal tumor‐adjacent tissues （P〈0 .05）;the low expression of miR‐204 was significantly associated with the tumor size （〉3 cm ,P〈0 .05） , lymph node metastasis（P〈0 .05） and advanced TNM stage（Ⅲ ＋ Ⅳ ,P〈0 .05） .Both the mRNA and protin expression in RCCC Caki‐1 cells were down‐regulated after transfection .Conclusion The expression of miR‐204 is down-regulated in the RCCC tissue and is related to the malignant clinicopathological features ,and miR‐204 may suppress the RCCC genesis and development through down‐regulating the expression of Bcl‐2 and SIRT1 .