Carbon monoxide activates large-conductance calcium-activated potassium channels of human cardiac fibroblasts through various mechanismsopen access
- Authors
- Bae, Hyemi; Kim, Taeho; Lim, Inja
- Issue Date
- May-2021
- Publisher
- KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY
- Keywords
- Calcium-activated potassium channel; Carbon monoxide; Nitric oxide; Protein kinases
- Citation
- KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY, v.25, no.3, pp 227 - 237
- Pages
- 11
- Journal Title
- KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY
- Volume
- 25
- Number
- 3
- Start Page
- 227
- End Page
- 237
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/50705
- DOI
- 10.4196/kjpp.2021.25.3.227
- ISSN
- 1226-4512
2093-3827
- Abstract
- Carbon monoxide (CO) is a cardioprotectant and potential cardiovascular therapeutic agent. Human cardiac fibroblasts (HCFs) are important determinants of myocardial structure and function. Large-conductance Ca2+-activated K+ (BK) channel is a potential therapeutic target for cardiovascular disease. We investigated whether CO modulates BK channels and the signaling pathways in HCFs using whole-cell mode patch-clamp recordings. CO-releasing molecules (CORMs; CORM-2 and CORM-3) significantly increased the amplitudes of BK currents (IBK). The CO-induced stimulating effects on IBK were blocked by pre-treatment with specific nitric oxide synthase (NOS) blockers (L-N-G-monomethyl arginine citrate and L-N-G-nitroarginine methyl ester). 8-bromo-cyclic GMP increased IBK. KT5823 (inhibits PKG) or ODQ (inhibits soluble guanylate cyclase) blocked the CO-stimulating effect on IBK. Moreover, 8-bromo-cyclic AMP also increased IBK, and pre-treatment with KT5720 (inhibits PKA) or SQ22536 (inhibits adenylate cyclase) blocked the CO effect. Pre-treatment with N-ethylmaleimide (a thiol-alkylating reagent) also blocked the CO effect on IBK, and DL-dithiothreitol (a reducing agent) reversed the CO effect. These data suggest that CO activates IBK through NO via the NOS and through the PKG, PKA, and S-nitrosylation pathways.
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