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Human Insulin Growth Factor 2 mRNA Binding Protein 2 Increases MicroRNA 33a/b Inhibition of Liver ABCA1 Expression and Alters Low-Density Apolipoprotein Levels in Mice.
Molecular and Cellular Biology ( IF 3.2 ) Pub Date : 2020-07-29 , DOI: 10.1128/mcb.00058-20
Muhua Yang 1 , Christina Gallo-Ebert 1 , Michael Hayward 2 , Weidong Liu 1 , Virginia McDonough 3 , Joseph T Nickels 4, 5
Affiliation  

Genome-wide association studies (GWAS) have linked IGF2BP2 single-nucleotide polymorphisms (SNPs) with type 2 diabetes (T2D). Mice overexpressing mIGF2BP2 have elevated cholesterol levels when fed a diet that induces hepatic steatosis. These and other studies suggest an important role for insulin growth factor 2 mRNA binding protein 2 (IGF2BP2) in the initiation and progression of several metabolic disorders. The ATPase binding cassette protein ABCA1 initiates nascent high-density apolipoprotein (HDL) biogenesis by transferring phospholipid and cholesterol to delipidated apolipoprotein AI (ApoAI). Individuals with mutational ablation of ABCA1 have Tangier disease, which is characterized by a complete loss of HDL. MicroRNA 33a and 33b (miR-33a/b) bind to the 3' untranslated region (UTR) of ABCA1 and repress its posttranscriptional gene expression. Here, we show that IGF2BP2 works together with miR-33a/b in repressing ABCA1 expression. Our data suggest that IGF2BP2 is an accessory protein of the argonaute (AGO2)-miR-33a/b-RISC complex, as it directly binds to miR-33a/b, AGO2, and the 3' UTR of ABCA1 Finally, we show that mice overexpressing human IGF2BP2 have decreased ABCA1 expression, increased low-density lipoprotein-cholesterol (LDL-C) and cholesterol blood levels, and elevated SREBP-dependent signaling. Our data support the hypothesis that IGF2BP2 has an important role in maintaining lipid homeostasis through its modulation of ABCA1 expression, as its overexpression or loss leads to dyslipidemia.

中文翻译:

人胰岛素生长因子2 mRNA结合蛋白2增加小鼠肝脏ABCA1表达的MicroRNA 33a / b抑制作用并改变小鼠低密度载脂蛋白水平。

全基因组关联研究(GWAS)已将IGF2BP2单核苷酸多态性(SNP)与2型糖尿病(T2D)相关联。当喂食诱导肝脂肪变性的饮食时,过表达mIGF2BP2的小鼠胆固醇水平升高。这些研究和其他研究表明,胰岛素生长因子2 mRNA结合蛋白2(IGF2BP2)在几种代谢性疾病的发生和发展中起着重要作用。ATPase结合盒蛋白ABCA1通过将磷脂和胆固醇转移到脂化载脂蛋白AI(ApoAI)来启动新生的高密度载脂蛋白(HDL)生物合成。具有ABCA1突变消融的个体患有丹吉尔病,其特征是HDL完全丧失。MicroRNA 33a和33b(miR-33a / b)与3'结合 非翻译区(UTR),并抑制其转录后基因表达。在这里,我们显示了IGF2BP2与miR-33a / b共同抑制ABCA1表达。我们的数据表明,IGF2BP2是精子(AGO2)-miR-33a / b-RISC复合物的辅助蛋白,因为它直接结合到miR-33a / b,AGO2和ABCA1的3'UTR。最后,我们证明了过表达人IGF2BP2的小鼠的ABCA1表达降低,低密度脂蛋白胆固醇(LDL-C)和胆固醇血液水平升高,以及SREBP依赖性信号转导升高。我们的数据支持以下假设:IGF2BP2通过调节ABCA1表达在维持脂质稳态方面起着重要作用,因为其过表达或丢失会导致血脂异常。我们的数据表明,IGF2BP2是精氨酸(AGO2)-miR-33a / b-RISC复合物的辅助蛋白,因为它直接结合到miR-33a / b,AGO2和ABCA1的3'UTR。最后,我们证明了过表达人IGF2BP2的小鼠的ABCA1表达降低,低密度脂蛋白胆固醇(LDL-C)和胆固醇血液水平升高,以及SREBP依赖性信号传导升高。我们的数据支持以下假设:IGF2BP2通过调节ABCA1表达在维持脂质稳态方面起着重要作用,因为其过表达或丢失会导致血脂异常。我们的数据表明,IGF2BP2是精子(AGO2)-miR-33a / b-RISC复合物的辅助蛋白,因为它直接结合到miR-33a / b,AGO2和ABCA1的3'UTR。最后,我们证明了过表达人IGF2BP2的小鼠的ABCA1表达降低,低密度脂蛋白胆固醇(LDL-C)和胆固醇血液水平升高,以及SREBP依赖性信号转导升高。我们的数据支持以下假设:IGF2BP2通过调节ABCA1表达在维持脂质稳态方面起着重要作用,因为其过表达或丢失会导致血脂异常。低密度脂蛋白胆固醇(LDL-C)和胆固醇血液水平升高,以及SREBP依赖性信号传导升高。我们的数据支持以下假设:IGF2BP2通过调节ABCA1表达在维持脂质稳态方面起着重要作用,因为其过表达或丢失会导致血脂异常。低密度脂蛋白胆固醇(LDL-C)和胆固醇血液水平升高,以及SREBP依赖性信号传导升高。我们的数据支持以下假设:IGF2BP2通过调节ABCA1表达在维持脂质稳态方面起着重要作用,因为其过表达或丢失会导致血脂异常。
更新日期:2020-06-01
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