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Published in: Angiogenesis 4/2018

Open Access 01-11-2018 | Brief Communication

eNOS expression and NO release during hypoxia is inhibited by miR-200b in human endothelial cells

Authors: Anna Janaszak-Jasiecka, Anna Siekierzycka, Sylwia Bartoszewska, Marcin Serocki, Lawrence W. Dobrucki, James F. Collawn, Leszek Kalinowski, Rafal Bartoszewski

Published in: Angiogenesis | Issue 4/2018

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Abstract

The nitric oxide (NO) secreted by vascular endothelium is required for the maintenance of cardiovascular homeostasis. Diminished release of NO generated by endothelial NO synthase contributes to endothelial dysfunction. Hypoxia and ischemia reduce endothelial eNOS expression via posttranscriptional mechanisms that result in NOS3 transcript destabilization. Here, we examine whether microRNAs contribute to this mechanism. We followed the kinetics of hypoxia-induced changes in NOS3 mRNA and eNOS protein levels in primary human umbilical vein endothelial cells (HUVECs). Utilizing in silico predictive protocols to identify potential miRNAs that regulate eNOS expression, we identified miR-200b as a candidate. We established the functional miR-200b target sequence within the NOS3 3′UTR, and demonstrated that manipulation of the miRNA levels during hypoxia using miR-200b mimics and antagomirs regulates eNOS levels, and established that miR-200b physiologically limits eNOS expression during hypoxia. Furthermore, we demonstrated that the specific ablation of the hypoxic induction of miR-200b in HUVECs restored eNOS-driven hypoxic NO release to the normoxic levels. To determine whether miR-200b might be the only miRNA that had this effect, we utilized Next Generation Sequencing (NGS) to follow hypoxia-induced changes in the miRNA levels in HUVECS and found 83 novel hypoxamiRs, with two candidate miRNAs besides miR-200b that could potentially influence eNOS levels. Taken together, the data establish miR-200b-eNOS regulation as a first hypoxamiR-based mechanism that limits NO bioavailability during hypoxia in endothelial cells, and show that hypoxamiRs could become useful therapeutic targets for cardiovascular diseases and other hypoxic-related diseases including various types of cancer.
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Metadata
Title
eNOS expression and NO release during hypoxia is inhibited by miR-200b in human endothelial cells
Authors
Anna Janaszak-Jasiecka
Anna Siekierzycka
Sylwia Bartoszewska
Marcin Serocki
Lawrence W. Dobrucki
James F. Collawn
Leszek Kalinowski
Rafal Bartoszewski
Publication date
01-11-2018
Publisher
Springer Netherlands
Published in
Angiogenesis / Issue 4/2018
Print ISSN: 0969-6970
Electronic ISSN: 1573-7209
DOI
https://doi.org/10.1007/s10456-018-9620-y

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