ZFP36L1和ZFP36L2通过减少E2F1的表达和CCND1转录的长3'UTR异形的表达来降低环林D1的表达
Tze-Sian Chan1,2, Kun-Lin Lee3, Ching-Sheng Hung4,5
1Division of Gastroenterology, Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.
Molecular and cellular biochemistry
|August 7, 2024
概括
在结直肠癌细胞中,ZFP36L1和ZFP36L2蛋白降低林D1 (CCND1) mRNA的下调,特别是长异型. 这种调节涉及减少E2F1转录,并通过AU丰富元素 (ARE) 促进CCND1mRNA衰变.
科学领域:
- 分子生物学分子生物学
- 癌症研究 癌症研究
- 基因规则 基因规则
背景情况:
- 在细胞循环进展中至关重要的CCND1基因表现出替代的3'-未翻译区域 (3'UTR) 长度,长异型含有富含AU元素 (ARE) 向降解.
- 人类ZFP36家族蛋白质,拥有指 (TZF) 串联域,结合AREs以促进mRNA衰变.
- 之前的研究表明,ZFP36L1/L2 TZF域突变增加了CCND1的表达,这表明它具有调节作用.
研究的目的:
- 研究ZFP36L1和ZFP36L2在人类结直肠癌 (CRC) 细胞中对CCND1mRNA长3'UTR异型的下调作用.
- 阐明ZFP36L1/L2介导的CCND1表达的调节背后的分子机制.
主要方法:
- 对基因表达特征互动分析2 (GEPIA2) 数据库的生物信息分析,用于CRC组织中的基因表达.
- 在人类CRC细胞系中对ZFP36L1和ZFP36L2进行过度表达和淘汰实验 (T-REx-293,DLD-1,HCT116).
- 使用RT-qPCR或类似技术对总CCND1mRNA,CCND1长异型比和E2F1表达的定量分析.
- E2F1的淘汰实验评估其在CCND1调节中的作用.
主要成果:
- 与正常组织相比,GEPIA2数据显示CRC组织中ZFP36/ZFP36L1的下调和E2F1/CCND1的上调.
- 过度表达ZFP36L1/ZFP36L2降低了CRC细胞中的总CCND1,CCND1长异型比率和E2F1表达.
- 在ZFP36L1/ZFP36L2中,Knockdown增加了总CCND1,CCND1长异型比率和E2F1表达.
- E2F1 knockdown 降低了 CCND1 的表达,这表明 E2F1.1 的转录调节.
结论:
- ZFP36L1和ZFP36L2在人类结肠直肠癌细胞中负面调节CCND1的表达.
- 该机制涉及E2F1的转录抑制和长CCND1 3'UTR异型的转录后衰变.
- 这些发现突出了ZFP36L1/L2作为结直肠癌的潜在治疗点.
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