Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 23, Issue 22, Pages -Publisher
MDPI
DOI: 10.3390/ijms232213959
Keywords
natriuretic peptide receptor C; endothelial sodium channels; diacylglycerols; protein kinase C; aortic endothelial cells
Funding
- U.S. National Institutes of Health (NIH) Shared Instrumentation [1S10OD018141]
- NIH, National Institute of Health [R01HL142955]
- University of Florida College of Medicine
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This study aimed to investigate the mechanisms of EnNaC regulation associated with NPRC activation. The results showed that EnNaC protein expression and activity were reduced after treatment with an NPRC agonist, and this down-regulation was mediated by the DAG-PKC pathway. These findings have important implications for understanding the regulation of endothelial function and aortic stiffness.
The C-type natriuretic peptide receptor (NPRC) is expressed in many cell types and binds all natriuretic peptides with high affinity. Ligand binding results in the activation or inhibition of various intracellular signaling pathways. Although NPRC ligand binding has been shown to regulate various ion channels, the regulation of endothelial sodium channel (EnNaC) activity by NPRC activation has not been studied. The objective of this study was to investigate mechanisms of EnNaC regulation associated with NPRC activation in human aortic endothelial cells (hAoEC). EnNaC protein expression and activity was attenuated after treating hAoEC with the NPRC agonist cANF compared to vehicle, as demonstrated by Western blotting and patch clamping studies, respectively. NPRC knockdown studies using siRNA's corroborated the specificity of EnNaC regulation by NPRC activation mediated by ligand binding. The concentration of multiple diacylglycerols (DAG) and the activity of protein kinase C (PKC) was augmented after treating hAoEC with cANF compared to vehicle, suggesting EnNaC activity is down-regulated upon NPRC ligand binding in a DAG-PKC dependent manner. The reciprocal cross-talk between NPRC activation and EnNaC inhibition represents a feedback mechanism that presumably is involved in the regulation of endothelial function and aortic stiffness.
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