Evidence for microRNA-mediated regulation of steroidogenesis by hypoxia

Richard Man Kit YU, Gayathri CHATURVEDI, Steve Kwan Hok TONG, Suraia NUSRIN, John Paul GIESY, Shiu Sun Rudolf WU, Richard Yuen Chong KONG

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Abstract

Environmental hypoxia can occur in both natural and occupational environments. Over the recent years, the ability of hypoxia to cause endocrine disruption via perturbations in steroid synthesis (steroidogenesis) has become increasingly clear. To further understand the molecular mechanism underlying hypoxia-induced endocrine disruption, the steroid-producing human cell line H295R was used to identify microRNAs (miRNAs) affecting steroidogenic gene expression under hypoxia. Hypoxic treatment of H295R cells resulted in the downregulation of seven steroidogenic genes and one of these, CYP19A1 (aromatase), was shown to be regulated by the transcription factor hypoxia-inducible factor-1 (HIF-1). Using bioinformatic and luciferase reporter analyses, miR-98 was identified to be a CYP19A1-targeting miRNA from a subset of HIF-1-inducible miRNAs. Gain- and loss-of-function analysis suggested that under hypoxia, the increased expression of miR-98 led to the downregulation of CYP19A1 mRNA and protein expression and that it may have contributed to a reduction in estradiol (E2) production. Intriguingly, luciferase reporter assays using deletion constructs of a proximal 5'-flanking region of miR-98 did not reveal a hypoxia-responsive element (HRE)-containing promoter. Overall, this study provided evidence for the role of miRNAs in regulating steroidogenesis and novel insights into the molecular mechanisms of hypoxia-induced endocrine disruption. Copyright © 2014 American Chemical Society.
Original languageEnglish
Pages (from-to)1138-1147
JournalEnvironmental Science and Technology
Volume49
Issue number2
DOIs
Publication statusPublished - 2015

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hypoxia
MicroRNAs
Hypoxia-Inducible Factor 1
Luciferases
Steroids
Aromatase
5' Flanking Region
Bioinformatics
Gene expression
steroid
Estradiol
Assays
Transcription Factors
Genes
Cells
Messenger RNA
regulation
bioinformatics
Proteins
targeting

Citation

Yu, R. M. K., Chaturvedi, G., Tong, S. K. H., Nusrin, S., Giesy, J. P., Wu, R. S. S., & Kong, R. Y. C. (2015). Evidence for microRNA-mediated regulation of steroidogenesis by hypoxia. Environmental Science & Technology, 49(2), 1138-1147. doi: 10.1021/es504676s