TY - JOUR
T1 - Role of G3BP1 in glucocorticoid receptor-mediated microRNA-15b and microRNA-23a biogenesis in endothelial cells
AU - Kwok, Hoi-Hin
AU - Poon, Po-Ying
AU - Mak, Kylie Hin-Man
AU - Zhang, Lin-Yao
AU - Liu, Pei-Nian
AU - Zhang, Huoming
AU - Mak, Nai-Ki
AU - Yue, Patrick Ying-Kit
AU - Wong, Ricky Ngok-Shun
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: We would like to thank Ms. Hoi Ki LEE for her preliminary work on this study. This work was supported by the Dr. Gilbert Hung Ginseng Laboratory Fund.
PY - 2017/5/18
Y1 - 2017/5/18
N2 - MicroRNAs (miRNAs) are a family of non-coding RNAs that play crucial roles in regulating various normal cellular responses. Recent studies revealed that the canonical miRNA biogenesis pathway is subject to sophisticated regulation. Hormonal control of miRNA biogenesis by androgen and estrogen has been demonstrated, but the direct effects of the glucocorticoid receptor (GR) on miRNA biogenesis are unknown. This study revealed the role of GR in miRNA maturation. We showed that two GR agonists, dexamethasone and ginsenoside-Rg1 rapidly suppressed the expression of mature miR-15b, miR-23a, and miR-214 in human endothelial cells. RNA pulldown coupled with proteomic analysis identified GTPase-activating protein (SH3 domain) binding protein 1 (G3BP1) as one of the RNA-binding proteins mediating GR-regulated miRNA maturation. Activated GR induced phosphorylation of v-AKT Murine Thymoma Viral Oncogene Homologue (AKT) kinase, which in turn phosphorylated and promoted nuclear translocation of G3BP1. The nuclear G3BP1 bound to the G3BP1 consensus sequence located on primary miR-15b~16-2 and miR-23a~27a~24-2 to inhibit their maturation. The findings from this study have advanced our understanding of the non-genomic effects of GR in the vascular system.
AB - MicroRNAs (miRNAs) are a family of non-coding RNAs that play crucial roles in regulating various normal cellular responses. Recent studies revealed that the canonical miRNA biogenesis pathway is subject to sophisticated regulation. Hormonal control of miRNA biogenesis by androgen and estrogen has been demonstrated, but the direct effects of the glucocorticoid receptor (GR) on miRNA biogenesis are unknown. This study revealed the role of GR in miRNA maturation. We showed that two GR agonists, dexamethasone and ginsenoside-Rg1 rapidly suppressed the expression of mature miR-15b, miR-23a, and miR-214 in human endothelial cells. RNA pulldown coupled with proteomic analysis identified GTPase-activating protein (SH3 domain) binding protein 1 (G3BP1) as one of the RNA-binding proteins mediating GR-regulated miRNA maturation. Activated GR induced phosphorylation of v-AKT Murine Thymoma Viral Oncogene Homologue (AKT) kinase, which in turn phosphorylated and promoted nuclear translocation of G3BP1. The nuclear G3BP1 bound to the G3BP1 consensus sequence located on primary miR-15b~16-2 and miR-23a~27a~24-2 to inhibit their maturation. The findings from this study have advanced our understanding of the non-genomic effects of GR in the vascular system.
UR - http://hdl.handle.net/10754/625021
UR - http://link.springer.com/article/10.1007/s00018-017-2540-y
UR - http://www.scopus.com/inward/record.url?scp=85019647333&partnerID=8YFLogxK
U2 - 10.1007/s00018-017-2540-y
DO - 10.1007/s00018-017-2540-y
M3 - Article
C2 - 28523344
SN - 1420-682X
VL - 74
SP - 3613
EP - 3630
JO - Cellular and Molecular Life Sciences
JF - Cellular and Molecular Life Sciences
IS - 19
ER -