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Related Experiment Videos

Reduced G protein function in desensitized rat aorta.

M D Johnson1, H Y Wang, D Ciechanowski

  • 1Department of Pharmacology, Medical College of Pennsylvania, Philadelphia.

The Journal of Pharmacology and Experimental Therapeutics
|October 1, 1991
PubMed
Summary
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Norepinephrine infusion in rats caused vascular desensitization, specifically reducing alpha 1 adrenergic receptor ability to activate Gs and Gi proteins. This desensitization impacted norepinephrine-stimulated contractions but not those from KCl or serotonin.

Area of Science:

  • Pharmacology
  • Physiology
  • Molecular Biology

Background:

  • Vascular desensitization is a complex process affecting blood vessel responsiveness.
  • G proteins play a critical role in signal transduction pathways initiated by receptor activation.
  • Understanding receptor-specific G protein involvement is key to explaining desensitization mechanisms.

Purpose of the Study:

  • To investigate the role of G proteins in norepinephrine-induced vascular desensitization.
  • To determine the specific G protein subtypes affected by chronic norepinephrine infusion.
  • To elucidate the impact of desensitization on alpha 1 adrenergic receptor signaling.

Main Methods:

  • Rats were infused with norepinephrine (NE) or vehicle for 6 days.
  • Aortic rings were isolated to measure NE-stimulated contractile responses.

Related Experiment Videos

  • NaF-stimulated contraction assessed overall G protein function.
  • Agonist-stimulated 35S-GTPγS binding measured G protein activation by specific receptors.

    • Main Results:

    • NE infusion blunted NE-stimulated aortic contraction, indicating desensitization.
    • Desensitization was specific to NE receptors, as KCl and serotonin responses were unaffected.
    • NaF-stimulated contraction was reduced, suggesting impaired G protein function.
    • Phenylephrine-stimulated GTPγS binding to Gs and Gi was reduced in NE-infused rats, while 5-HT responses were unaltered.

    Conclusions:

    • Chronic norepinephrine infusion induces vascular desensitization.
    • This desensitization involves selective reductions in alpha 1 adrenergic receptor-mediated activation of Gs and Gi proteins.
    • The findings highlight specific G protein deficits in norepinephrine-induced vascular desensitization.