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Effects of nitric oxide on apoptosis and voltage‐gated calcium channels in human cardiac myofibroblasts
- Source :
- Clinical and Experimental Pharmacology and Physiology. 47:16-26
- Publication Year :
- 2019
- Publisher :
- Wiley, 2019.
-
Abstract
- We characterised the voltage-gated Ca2+ channels (VGCCs) in human cardiac fibroblasts (HCFs) and myofibroblasts (HCMFs) and investigated the effects of nitric oxide (NO) on apoptosis and on these channels. Western blotting and immunofluorescence analyses show that α-smooth muscle actin (a myofibroblast marker) was markedly expressed in passage (P) 12-15 but not in P4 HCF cells, whereas calponin (a fibroblast marker) was expressed only in P4 cells. CaV 1.2 (L-type) and CaV 3.3 (T-type) of VGCCs were highly expressed in P12-15 cells, but only weak CaV 2.3 (R-type) expression was identified in P4 cells using reverse transcription-polymerase chain reaction analysis. S-Nitroso-N-acetylpenicillamine (SNAP, an NO donor) decreased cell viability of HCMFs in a dose-dependent manner and induced apoptotic changes, and nifedipine (an L-type Ca2+ channel blocker) prevented apoptosis as shown with immunofluorescence staining and flow cytometry. Whole-cell mode patch-clamp recordings demonstrate the presence of L-type Ca2+ (IC a,L ) and T-type Ca2+ (IC a,T ) currents in HCMFs. SNAP inhibited IC a,L of HCMFs, but pre-treatment with ODQ (a guanylate cyclase inhibitor) or KT5823 (a PKG inhibitor) prevented it. Pre-treating cells with KT5720 (a PKA inhibitor) or SQ22536 (an adenylate cyclase inhibitor) blocked SNAP-induced inhibition of IC a,L . 8-Bromo-cyclic GMP or 8-bromo-cyclic AMP also inhibited IC a,L . However, pre-treatment with N-ethylmaleimide (a thiol-alkylating reagent) did not block the SNAP effect, nor did DL-dithiothreitol (a reducing agent) reverse it. These data suggest that high concentrations of NO injure HCMFs and inhibit IC a,L through the PKG and PKA signalling pathways but not through the S-nitrosylation pathway.
- Subjects :
- 0301 basic medicine
Physiology
Carbazoles
Apoptosis
Nitric Oxide
Nitric oxide
03 medical and health sciences
chemistry.chemical_compound
0302 clinical medicine
Physiology (medical)
Cyclic GMP-Dependent Protein Kinases
Humans
Nitric Oxide Donors
Pyrroles
Channel blocker
Viability assay
Myofibroblasts
Cyclic GMP
Cells, Cultured
Pharmacology
Voltage-dependent calcium channel
Chemistry
Snap
Fibroblasts
KT5720
Molecular biology
030104 developmental biology
Guanylate Cyclase
030220 oncology & carcinogenesis
Calcium Channels
Myofibroblast
Signal Transduction
Subjects
Details
- ISSN :
- 14401681 and 03051870
- Volume :
- 47
- Database :
- OpenAIRE
- Journal :
- Clinical and Experimental Pharmacology and Physiology
- Accession number :
- edsair.doi.dedup.....e73a83bb029abc030959b407dedd7dfe