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Related Experiment Videos

Vasoconstriction increases pulmonary nitric oxide synthesis and circulating cyclic GMP

P S Wilson1, W J Thompson, T M Moore

  • 1Department of Physiology, University of South Alabama College of Medicine, Mobile 36688, USA.

The Journal of Surgical Research
|June 1, 1997
PubMed
Summary

Increased vascular shear stress stimulates nitric oxide synthesis in rat lungs. This study shows that vasoconstriction enhances nitric oxide production, particularly under constant flow conditions.

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Area of Science:

  • Pulmonary circulation physiology
  • Vascular biology
  • Nitric oxide signaling

Background:

  • Shear stress is a key regulator of endothelial nitric oxide (NO) synthesis in the systemic circulation.
  • The role of shear stress in pulmonary NO synthesis remains less understood.

Purpose of the Study:

  • To investigate whether increased vascular shear stress stimulates nitric oxide synthesis in isolated rat lungs.
  • To explore the impact of different perfusion methods (constant flow vs. constant pressure) on NO production.

Main Methods:

  • Isolated rat lungs were treated with U46619 (vasoconstrictor) and perfused at constant flow or constant pressure.
  • Nitric oxide synthesis was assessed by measuring pulmonary vascular resistance (PVR), compliance, and perfusate cyclic GMP concentrations.

Related Experiment Videos

  • Inhibition of nitric oxide synthase (NOS) and soluble guanylyl cyclase (sGC) was evaluated using N omega-methyl-L-arginine (LMA) and 6-anilino-5,8-quinolinodione (LY83583), respectively.

    • Main Results:

    • U46619 infusion increased PVR and decreased compliance in all lungs.
    • NOS and sGC inhibition increased PVR in lungs perfused at constant flow but not at constant pressure.
    • Perfusate cyclic GMP levels significantly increased with U46619 in constant flow-perfused lungs, but not in constant pressure-perfused lungs.
    • Zaprinast (a phosphodiesterase inhibitor) increased perfusate cyclic GMP, confirming its reflection of intracellular levels.

    Conclusions:

    • Vasoconstriction induced by U46619 increases nitric oxide synthesis in isolated rat lungs.
    • Shear stress, modulated by perfusion conditions, appears to be a significant factor in stimulating pulmonary NO production.
    • Perfusate cyclic GMP concentrations serve as a reliable indicator of sGC activation in this experimental model.