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Angiotensin II-mediated posttranslational modification of nNOS in the PVN of rats with CHF: role for PIN.
Am J Physiol Heart Circ Physiol. 2013 Sep 15; 305(6):H843-55.AJ

Abstract

An increased sympathetic drive is an adverse characteristic in chronic heart failure (CHF). The protein expression of neuronal nitric oxide synthase (nNOS)- and hence nitric oxide (NO)-mediated sympathoinhibition is reduced in the paraventricular nucleus (PVN) of rats with CHF. However, the molecular mechanism(s) of nNOS downregulation remain(s) unclear. The aim of the study was to reveal the underlying molecular mechanism for the downregulation of nNOS in the PVN of CHF rats. Sprague-Dawley rats with CHF (6-8 wk after coronary artery ligation) demonstrated decreased nNOS dimer/monomer ratio (42%), with a concomitant increase in the expression of PIN (a protein inhibitor of nNOS known to dissociate nNOS dimers into monomers) by 47% in the PVN. Similarly, PIN expression is increased in a neuronal cell line (NG108) treated with angiotensin II (ANG II). Furthermore, there is an increased accumulation of high-molecular-weight nNOS-ubiquitin (nNOS-Ub) conjugates in the PVN of CHF rats (29%). ANG II treatment in NG108 cells in the presence of a proteasome inhibitor, lactacystin, also leads to a 69% increase in accumulation of nNOS-Ub conjugates immunoprecipitated by an antiubiquitin antibody. There is an ANG II-driven, PIN-mediated decrease in the dimeric catalytically active nNOS in the PVN, due to ubiquitin-dependent proteolytic degradation in CHF. Our results show a novel intermediary mechanism that leads to decreased levels of active nNOS in the PVN, involved in subsequent reduction in sympathoinhibition during CHF, offering a new target for the treatment of CHF and other cardiovascular diseases.

Authors+Show Affiliations

Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, N.I.H., Extramural

Language

eng

PubMed ID

23832698

Citation

Sharma, Neeru M., et al. "Angiotensin II-mediated Posttranslational Modification of nNOS in the PVN of Rats With CHF: Role for PIN." American Journal of Physiology. Heart and Circulatory Physiology, vol. 305, no. 6, 2013, pp. H843-55.
Sharma NM, Llewellyn TL, Zheng H, et al. Angiotensin II-mediated posttranslational modification of nNOS in the PVN of rats with CHF: role for PIN. Am J Physiol Heart Circ Physiol. 2013;305(6):H843-55.
Sharma, N. M., Llewellyn, T. L., Zheng, H., & Patel, K. P. (2013). Angiotensin II-mediated posttranslational modification of nNOS in the PVN of rats with CHF: role for PIN. American Journal of Physiology. Heart and Circulatory Physiology, 305(6), H843-55. https://doi.org/10.1152/ajpheart.00170.2013
Sharma NM, et al. Angiotensin II-mediated Posttranslational Modification of nNOS in the PVN of Rats With CHF: Role for PIN. Am J Physiol Heart Circ Physiol. 2013 Sep 15;305(6):H843-55. PubMed PMID: 23832698.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Angiotensin II-mediated posttranslational modification of nNOS in the PVN of rats with CHF: role for PIN. AU - Sharma,Neeru M, AU - Llewellyn,Tamra L, AU - Zheng,Hong, AU - Patel,Kaushik P, Y1 - 2013/07/05/ PY - 2013/7/9/entrez PY - 2013/7/9/pubmed PY - 2013/11/15/medline KW - PIN KW - angiotensin II KW - nNOS KW - paraventricular nucleus KW - sympathetic nerve activity SP - H843 EP - 55 JF - American journal of physiology. Heart and circulatory physiology JO - Am J Physiol Heart Circ Physiol VL - 305 IS - 6 N2 - An increased sympathetic drive is an adverse characteristic in chronic heart failure (CHF). The protein expression of neuronal nitric oxide synthase (nNOS)- and hence nitric oxide (NO)-mediated sympathoinhibition is reduced in the paraventricular nucleus (PVN) of rats with CHF. However, the molecular mechanism(s) of nNOS downregulation remain(s) unclear. The aim of the study was to reveal the underlying molecular mechanism for the downregulation of nNOS in the PVN of CHF rats. Sprague-Dawley rats with CHF (6-8 wk after coronary artery ligation) demonstrated decreased nNOS dimer/monomer ratio (42%), with a concomitant increase in the expression of PIN (a protein inhibitor of nNOS known to dissociate nNOS dimers into monomers) by 47% in the PVN. Similarly, PIN expression is increased in a neuronal cell line (NG108) treated with angiotensin II (ANG II). Furthermore, there is an increased accumulation of high-molecular-weight nNOS-ubiquitin (nNOS-Ub) conjugates in the PVN of CHF rats (29%). ANG II treatment in NG108 cells in the presence of a proteasome inhibitor, lactacystin, also leads to a 69% increase in accumulation of nNOS-Ub conjugates immunoprecipitated by an antiubiquitin antibody. There is an ANG II-driven, PIN-mediated decrease in the dimeric catalytically active nNOS in the PVN, due to ubiquitin-dependent proteolytic degradation in CHF. Our results show a novel intermediary mechanism that leads to decreased levels of active nNOS in the PVN, involved in subsequent reduction in sympathoinhibition during CHF, offering a new target for the treatment of CHF and other cardiovascular diseases. SN - 1522-1539 UR - https://www.unboundmedicine.com/medline/citation/23832698/Angiotensin_II_mediated_posttranslational_modification_of_nNOS_in_the_PVN_of_rats_with_CHF:_role_for_PIN_ L2 - https://journals.physiology.org/doi/10.1152/ajpheart.00170.2013?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -