Advanced search
1 file | 1.10 MB

Tyrosine phosphorylation of eNOS regulates myocardial survival after an ischaemic insult: role of PYK2

(2017) CARDIOVASCULAR RESEARCH. 113(8). p.926-937
Author
Organization
Abstract
Aims: Endothelial nitric oxide (NO) synthase (eNOS) is known to play a cardioprotective protective. However, the molecular mechanisms regulating eNOS activity during ischaemia/reperfusion (I/R) injury are incompletely understood. eNOS is a substrate for several kinases that positively or negatively affect its enzymatic activity. Herein, we sought to correlate eNOS phosphorylation status with cardiomyocyte survival and we investigated the contribution of the proline-rich tyrosine kinase 2 (PYK2)/eNOS axis to the regulation of myocardial infarct size in vivo. Methods and results: Exposure of H9c2 cardiomyocytes to H2O2 lead to PYK2 phosphorylation on its activator site (Y402) and eNOS phosphorylation on the inhibitor site Y656 and the activator site S1176. Both H2O2-induced eNOS phosphorylation events were abolished by PYK2 pharmacological inhibition or gene knockdown. Activity assays demonstrated that phosphorylation of the tyrosine inhibitory site exerts a dominant effect over S1176. In cardiomyocytes subjected to oxidative stress or oxygen-glucose deprivation, inhibition of PYK2 limited cell injury; this effect was prevented by inhibition of NO production. In vivo, ischaemia-reperfusion induced an early activation of PYK2, leading to eNOS phosphorylation on Y656, which, in turn, reduced NO output, as judged by the low tissue levels of its downstream effector cGMP. Moreover, pharmacological blockade of PYK2 alleviated eNOS inhibition and prevented cardiac damage following I/R injury in wild-type, but not in eNOS KO mice. Conclusion: The current studies demonstrate that PYK2 is a pivotal regulator of eNOS function in myocardial infarction and identify PYK2 as a novel therapeutic target for cardioprotection.
Keywords
NITRIC-OXIDE SYNTHASE, FLUID SHEAR-STRESS, FOCAL ADHESION KINASE, REPERFUSION INJURY, RAT-HEART, CARDIOPROTECTION, ACTIVATION, PATHWAY, HYPERTROPHY, EXPRESSION, Reperfusion injury, eNOS, Cyclic nucleotide, Myocardial infarction, Cardioprotection

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 1.10 MB

Citation

Please use this url to cite or link to this publication:

Chicago
Bibli, Sofia-Iris, Zongmin Zhou, Sven Zukunft, Beate Fisslthaler, Ioanna Andreadou, Csaba Szabo, Peter Brouckaert, Ingrid Fleming, and Andreas Papapetropoulos. 2017. “Tyrosine Phosphorylation of eNOS Regulates Myocardial Survival After an Ischaemic Insult: Role of PYK2.” Cardiovascular Research 113 (8): 926–937.
APA
Bibli, S.-I., Zhou, Z., Zukunft, S., Fisslthaler, B., Andreadou, I., Szabo, C., Brouckaert, P., et al. (2017). Tyrosine phosphorylation of eNOS regulates myocardial survival after an ischaemic insult: role of PYK2. CARDIOVASCULAR RESEARCH, 113(8), 926–937.
Vancouver
1.
Bibli S-I, Zhou Z, Zukunft S, Fisslthaler B, Andreadou I, Szabo C, et al. Tyrosine phosphorylation of eNOS regulates myocardial survival after an ischaemic insult: role of PYK2. CARDIOVASCULAR RESEARCH. 2017;113(8):926–37.
MLA
Bibli, Sofia-Iris et al. “Tyrosine Phosphorylation of eNOS Regulates Myocardial Survival After an Ischaemic Insult: Role of PYK2.” CARDIOVASCULAR RESEARCH 113.8 (2017): 926–937. Print.
@article{8527483,
  abstract     = {Aims: Endothelial nitric oxide (NO) synthase (eNOS) is known to play a cardioprotective protective. However, the molecular mechanisms regulating eNOS activity during ischaemia/reperfusion (I/R) injury are incompletely understood. eNOS is a substrate for several kinases that positively or negatively affect its enzymatic activity. Herein, we sought to correlate eNOS phosphorylation status with cardiomyocyte survival and we investigated the contribution of the proline-rich tyrosine kinase 2 (PYK2)/eNOS axis to the regulation of myocardial infarct size in vivo. 
Methods and results: Exposure of H9c2 cardiomyocytes to H2O2 lead to PYK2 phosphorylation on its activator site (Y402) and eNOS phosphorylation on the inhibitor site Y656 and the activator site S1176. Both H2O2-induced eNOS phosphorylation events were abolished by PYK2 pharmacological inhibition or gene knockdown. Activity assays demonstrated that phosphorylation of the tyrosine inhibitory site exerts a dominant effect over S1176. In cardiomyocytes subjected to oxidative stress or oxygen-glucose deprivation, inhibition of PYK2 limited cell injury; this effect was prevented by inhibition of NO production. In vivo, ischaemia-reperfusion induced an early activation of PYK2, leading to eNOS phosphorylation on Y656, which, in turn, reduced NO output, as judged by the low tissue levels of its downstream effector cGMP. Moreover, pharmacological blockade of PYK2 alleviated eNOS inhibition and prevented cardiac damage following I/R injury in wild-type, but not in eNOS KO mice. 
Conclusion: The current studies demonstrate that PYK2 is a pivotal regulator of eNOS function in myocardial infarction and identify PYK2 as a novel therapeutic target for cardioprotection.},
  author       = {Bibli, Sofia-Iris and Zhou, Zongmin and Zukunft, Sven and Fisslthaler, Beate and Andreadou, Ioanna and Szabo, Csaba and Brouckaert, Peter and Fleming, Ingrid and Papapetropoulos, Andreas},
  issn         = {0008-6363},
  journal      = {CARDIOVASCULAR RESEARCH},
  keywords     = {NITRIC-OXIDE SYNTHASE,FLUID SHEAR-STRESS,FOCAL ADHESION KINASE,REPERFUSION INJURY,RAT-HEART,CARDIOPROTECTION,ACTIVATION,PATHWAY,HYPERTROPHY,EXPRESSION,Reperfusion injury,eNOS,Cyclic nucleotide,Myocardial infarction,Cardioprotection},
  language     = {eng},
  number       = {8},
  pages        = {926--937},
  title        = {Tyrosine phosphorylation of eNOS regulates myocardial survival after an ischaemic insult: role of PYK2},
  url          = {http://dx.doi.org/10.1093/cvr/cvx058},
  volume       = {113},
  year         = {2017},
}

Altmetric
View in Altmetric
Web of Science
Times cited: