Cited by 441Ion channel regulation and functionRedox biology and oxidative stressNitric Oxide and Endothelin Effects

Redox modulation of L-type calcium channels in ferret ventricular myocytes. Dual mechanism regulation by nitric oxide and S-nitrosothiols.

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Campbell, D L, Stamler, J S, Strauss, H C·1996·The Journal of general physiology

Abstract

The effects of NO-related activity and cellular thiol redox state on basal L-type calcium current, ICa,L, in ferret right ventricular myocytes were studied using the patch clamp technique. SIN-1, which generates both NO. and O2-, either inhibited or stimulated ICa,L. In the presence of superoxide dismutase only inhibition was seen. 8-Br-cGMP also inhibited ICa,L, suggesting that the NO inhibition is cGMP-dependent. On the other hand, S-nitrosothiols (RSNOs), which donate NO+, stimulated ICa,L. RSNO effects were not dependent upon cell permeability, modulation of SR Ca2+ release, activation of kinases, inhibition of phosphatases, or alterations in cGMP levels. Similar activation of ICa,L by thiol oxidants, and reversal by thiol reductants, identifies an allosteric thiol-containing "redox switch" on the L-type calcium channel subunit complex by which NO/O2- and NO+ transfer can exert effects opposite to those produced by NO. In sum, our results suggest that: (a) both indirect (cGMP-dependent) and direct (S-nitrosylation/oxidation) regulation of ventricular ICa,L, and (b) sarcolemma thiol redox state may be an important determinant of ICa,L activity.

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Authors
Campbell, D. L., Stamler, J. S., & Strauss, H. C.
Affiliations
Duke Medical Center (US)
Venue
The Journal of general physiology
Published
1996-10-01
Volume
108
Issue
4
Pages
277-293
ISSN
  • 0022-1295 (ISSN-L)
  • 1540-7748
OpenAlex
W2143855170
Cited by
441
References
104
Citations by year
2026: 1 · 2025: 2 · 2024: 3 · 2023: 2 · 2022: 2 · 2021: 4 · 2020: 8 · 2019: 3 · 2018: 5 · 2017: 7 · 2016: 8 · 2015: 6 · 2014: 13 · 2013: 12 · 2012: 25
FWCI
7.32
Type
journal article
Language
en
Open access
Locations
  • The Journal of General Physiology (publishedVersion)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (1k08hl002582-01, 5p50hl054314-05)
  • National Heart, Lung, and Blood Institute (HL02582, HL 19216, HL-54314)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
Keywords
L-type calcium channels, nitric oxide, S-nitrosothiols, thiol redox state, ventricular myocytes, ferrets, SIN-1, superoxide, S-nitrosylation, allosteric regulation, redox switch
MeSH terms
Animals, Extracellular Space, Ferrets, Heart Ventricles, Male, Molsidomine, Myocardium, Nitric Oxide, Nitroso Compounds, Oxidation-Reduction, Sulfhydryl Compounds, Calcium Channels, Patch-Clamp Techniques

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