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Related Experiment Videos

S-nitrosoglutathione-induced decrease in calcium sensitivity of airway smooth muscle.

C M Pabelick1, D O Warner, W J Perkins

  • 1Department of Anesthesiology, Mayo Clinic and Foundation, Rochester, Minnesota 55905, USA.

American Journal of Physiology. Lung Cellular and Molecular Physiology
|March 11, 2000
PubMed
Summary
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The nitric oxide donor S-nitrosoglutathione (GSNO) relaxes canine tracheal smooth muscle (CTSM) by reducing calcium sensitivity. GSNO impacts regulatory myosin light chain phosphorylation, suggesting myosin light chain kinase inhibition or phosphatase activation.

Area of Science:

  • Physiology
  • Pharmacology

Background:

  • Nitric oxide (NO) plays a crucial role in regulating smooth muscle function.
  • Understanding the mechanisms of NO-mediated smooth muscle relaxation is vital for treating respiratory conditions.

Purpose of the Study:

  • To investigate if S-nitrosoglutathione (GSNO) relaxes canine tracheal smooth muscle (CTSM) by decreasing calcium (Ca2+) sensitivity.
  • To determine if GSNO alters the relationship between Ca2+ concentration, regulatory myosin light chain (rMLC) phosphorylation, and force production in CTSM.

Main Methods:

  • Intact CTSM strips were contracted using 45 mM KCl.
  • The effects of 100 microM GSNO on muscle relaxation, Ca2+ sensitivity, and rMLC phosphorylation were measured.
  • Relationships between intracellular Ca2+ concentration ([Ca2+]i), rMLC phosphorylation, and isometric force were analyzed.

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Main Results:

  • GSNO significantly relaxed CTSM strips contracted with KCl by decreasing Ca2+ sensitivity.
  • GSNO treatment did not significantly alter intracellular Ca2+ concentration ([Ca2+]i).
  • GSNO reduced rMLC phosphorylation for a given [Ca2+]i but did not affect the force-to-phosphorylation relationship.

Conclusions:

  • GSNO decreases Ca2+ sensitivity in CTSM strips contracted with KCl.
  • The mechanism involves altering rMLC phosphorylation relative to [Ca2+]i, suggesting GSNO inhibits myosin light chain kinase or activates smooth muscle protein phosphatases.