Journal article
Neeru M. Sharma, S. Nandi, Hong Zheng, P. Mishra, K. Patel
American Journal of Physiology. Heart and Circulatory Physiology, 2017
American Journal of Physiology. Heart and Circulatory Physiology, 2017
Semantic Scholar
DOI
PubMed
Cite
Cite
APA
Click to copy
Sharma, N. M., Nandi, S., Zheng, H., Mishra, P., & Patel, K. (2017). A novel role for miR-133a in centrally mediated activation of the renin-angiotensin system in congestive heart failure. American Journal of Physiology. Heart and Circulatory Physiology.
Chicago/Turabian
Click to copy
Sharma, Neeru M., S. Nandi, Hong Zheng, P. Mishra, and K. Patel. “A Novel Role for MiR-133a in Centrally Mediated Activation of the Renin-Angiotensin System in Congestive Heart Failure.” American Journal of Physiology. Heart and Circulatory Physiology (2017).
MLA
Click to copy
Sharma, Neeru M., et al. “A Novel Role for MiR-133a in Centrally Mediated Activation of the Renin-Angiotensin System in Congestive Heart Failure.” American Journal of Physiology. Heart and Circulatory Physiology, 2017.
BibTeX Click to copy
@article{neeru2017a,
title = {A novel role for miR-133a in centrally mediated activation of the renin-angiotensin system in congestive heart failure.},
year = {2017},
journal = {American Journal of Physiology. Heart and Circulatory Physiology},
author = {Sharma, Neeru M. and Nandi, S. and Zheng, Hong and Mishra, P. and Patel, K.}
}
Abstract
An activated renin-angiotensin system (RAS) within the central nervous system has been implicated in sympathoexcitation during various disease conditions including congestive heart failure (CHF). In particular, activation of the RAS in the paraventricular nucleus (PVN) of the hypothalamus has been recognized to augment sympathoexcitation in CHF. We observed a 2.6-fold increase in angiotensinogen (AGT) in the PVN of CHF. To elucidate the molecular mechanism for increased expression of AGT, we performed in silico analysis of the 3'-untranslated region (3'-UTR) of AGT and found a potential binding site for microRNA (miR)-133a. We hypothesized that decreased miR-133a might contribute to increased AGT in the PVN of CHF rats. Overexpression of miR-133a in NG108 cells resulted in 1.4- and 1.5-fold decreases in AGT and angiotensin type II (ANG II) type 1 receptor (AT1R) mRNA levels, respectively. A luciferase reporter assay performed on NG108 cells confirmed miR-133a binding to the 3'-UTR of AGT. Consistent with these in vitro data, we observed a 1.9-fold decrease in miR-133a expression with a concomitant increase in AGT and AT1R expression within the PVN of CHF rats. Furthermore, restoring the levels of miR-133a within the PVN of CHF rats with viral transduction resulted in a significant reduction of AGT (1.4-fold) and AT1R (1.5-fold) levels with a concomitant decrease in basal renal sympathetic nerve activity (RSNA). Restoration of miR-133a also abrogated the enhanced RSNA responses to microinjected ANG II within the PVN of CHF rats. These results reveal a novel and potentially unique role for miR-133a in the regulation of ANG II within the PVN of CHF rats, which may potentially contribute to the commonly observed sympathoexcitation in CHF.NEW & NOTEWORTHY Angiotensinogen (AGT) expression is upregulated in the paraventricular nucleus of the hypothalamus through posttranscriptional mechanism interceded by microRNA-133a in heart failure. Understanding the mechanism of increased expression of AGT in pathological conditions leading to increased sympathoexcitation may provide the basis for the possible development of new therapeutic agents with enhanced specificity.
