JunD enhances miR-29b levels transcriptionally and posttranscriptionally to inhibit proliferation of intestinal epithelial cells.

American Journal of Physiology. Cell Physiology
Tongtong ZouJian-Ying Wang

Abstract

Through its actions as component of the activating protein-1 (AP-1) transcription factor, JunD potently represses cell proliferation. Here we report a novel function of JunD in the regulation of microRNA expression in intestinal epithelial cells (IECs). Ectopically expressed JunD specifically increased the expression of primary and mature forms of miR-29b, whereas JunD silencing inhibited miR-29b expression. JunD directly interacted with the miR-29b1 promoter via AP-1-binding sites, whereas mutation of AP-1 sites from the miR-29b1 promoter prevented JunD-mediated transcriptional activation of the miR-29b1 gene. JunD also enhanced formation of the Drosha microprocessor complex, thus further promoting miR-29b biogenesis. Cellular polyamines were found to regulate miR-29b expression by altering JunD abundance, since the increase in miR-29b expression levels in polyamine-deficient cells was abolished by JunD silencing. In addition, miR-29b silencing prevented JunD-induced repression of IEC proliferation. Our findings indicate that JunD activates miR-29b by enhancing its transcription and processing, which contribute to the inhibitory effect of JunD on IEC growth and maintenance of gut epithelium homeostasis.

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Citations

Jun 3, 2016·Frontiers in Physiology·Sergio A Alcalá-CoronaEnrique Hernández-Lemus
Oct 6, 2016·Wiley Interdisciplinary Reviews. RNA·Jun-Yao WangJian-Ying Wang
Jan 17, 2019·American Journal of Physiology. Cell Physiology·Li-Ping JiangJaladanki N Rao
Mar 11, 2017·American Journal of Physiology. Gastrointestinal and Liver Physiology·Yuhua ZhuJunjun Wang
Mar 21, 2018·Molecular and Cellular Biology·Hee Kyoung ChungJian-Ying Wang

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