转录因子ZNF24在肿瘤中的研究进展

转录因子 ZNF24（也称 ZNF191 或 KOX17）是类 Krüppel 锌指转录因子家族成员，N 端有富含亮氨酸（Leu）的 SCAN 结构域（又称 LeR 结构域），C 端有 4 个连续的典型的类 Krüppel样锌指模体。ZNF24参与激酶转录活性调控、血管增生、发育等，尤其在肿瘤发生或发展中起着重要的作用，是多功能的转录因子。ZNF24通过调控不同靶基因（如VEGF、Wnt8B、Twist1、β-catenin和DGL1等）的转录表达以及竞争性结合蛋白因子（如β-catenin），在肿瘤的发生、发展、侵袭和转移中起着重要复杂的两面性作用（促进和抑制）。因此阐明ZNF24在肿瘤中的作用机理，将为肿瘤的治疗提供线索与思路。本文将对ZNF24在肿瘤中的研究进展作一综述。     

Long non-coding RNA HOXA11-AS contributes to the formation of keloid by relieving the inhibition of miR-182-5p on ZNF217

BackgroundLong non-coding RNA (lncRNA) dysregulation is demonstrated to be associated with disease progression. Mounting studies show that lncRNA promotes or inhibits the development of keloid. We aimed to disclose the role of homebox A11 antisense RNA (HOXA11-AS) in the formation of keloid.MethodsQuantitative real-time PCR (qPCR) was adopted for expression analysis of HOXA11-AS, miR-182-5p and zinc finger protein 217 (ZNF217) mRNA, and the expression of ZNF protein and marker proteins was detected by western blot. Cell proliferation, cell migration and cell apoptosis were investigated using CCK-8 assay, wound healing assay and flow cytometry assay, respectively. The potential interplay between miR-182-5p and HOXA11-AS or ZNF217 was verified by dual-luciferase reporter assay, RIP assay and pull-down assay. The role of HOXA11 in vivo was studied by establishing animal models.ResultsHOXA11-AS was highly expressed in tissues and fibroblasts of keloid. Deficiency of HOXA11-AS blocked the proliferation and migration of keloid fibroblasts and induced fibroblast apoptosis. HOXA11-AS directly combined to miR-182-5p whose downregulation reversed the effects of HOXA11-AS knockdown. ZNF217 was a target of miR-182-5p, and HOXA11-AS indirectly promoted ZNF217 expression by binding to miR-182-5p. MiR-182-5p enrichment also blocked keloid fibroblast proliferation, survival and migration, while further ZNF217 overexpression abolished these effects. HOXA11-AS knockdown also hindered the growth of keloid in mouse models.ConclusionHigh expression of HOXA11-AS promoted the formation and growth of keloid through the upregulation of ZNF217 by targeting miR-182-5p, and the inhibition of HOXA11-AS might be a novel strategy to prevent keloid development.     

锌指蛋白297B协同Myocardin调节平滑肌细胞的分化

目的探讨锌指蛋白297B在平滑肌细胞分化过程中的表达及相关机制。方法用定量实时多聚酶链反应检测锌指蛋白297B在人、大鼠和小鼠平滑肌细胞中体内/体外的表达量及在平滑肌细胞体内和体外分化或增殖过程中的表达变化;构建锌指蛋白297B-Myc表达质粒,免疫荧光检测锌指蛋白297B-Myc在大鼠平滑肌细胞中的表达分布;用荧光素酶活性检测及免疫共沉淀实验检测锌指蛋白297B与Myocardin的结合及相互作用。结果锌指蛋白297B在平滑肌细胞中特异性高表达,在小鼠胚胎干细胞向平滑肌细胞分化过程中表达上调,在血小板源性生长因子BB刺激的平滑肌细胞增殖过程中下调,在大鼠颈动脉球囊损伤内膜修复过程中表达先上调后下降。锌指蛋白297B主要分布于细胞核及核周的细胞质。锌指蛋白297B能与Myocardin蛋白结合,荧光素酶活性检测显示锌指蛋白297B的表达受Myocardin的调控。结论锌指蛋白297B可能在平滑肌细胞分化过程中起到重要正向调控作用,这一作用很可能是通过锌指蛋白297B与Myocardin的协同作用来完成。