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Related Experiment Videos

Microcirculatory responses to complement activation are blunted by hypertension

A S Lübbe1, R N Garrison, P D Harris

  • 1Department of Medicine R. Virchow Medical School Freie Universität Berlin, Germany.

Journal of Investigative Surgery : the Official Journal of the Academy of Surgical Research
|March 1, 1994
PubMed
Summary

Renovascular hypertension impairs skeletal muscle arteriole responses to complement activation. In hypertensive rats, this leads to reduced dilation in small arterioles, suggesting a counterbalanced constrictor mechanism.

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Area of Science:

  • Physiology
  • Cardiovascular Research
  • Sepsis Pathophysiology

Background:

  • Sepsis-induced vasodilation in skeletal muscle arterioles is endothelium-dependent.
  • Renovascular hypertension significantly impairs this vasodilatory response.
  • Complement activation can mimic sepsis-like microcirculatory changes.

Purpose of the Study:

  • To investigate the impact of renovascular hypertension on skeletal muscle microcirculatory responses to alternative complement system activation.
  • To determine if hypertension alters arteriolar constriction and dilation patterns during complement activation.

Main Methods:

  • Utilized normotensive and renovascular hypertensive rat models.
  • Administered zymosan to activate the alternative complement system.

Related Experiment Videos

  • Measured arteriolar diameter changes in skeletal muscle.
  • Employed hydroquinone to block endothelium-derived relaxing factor (EDRF) in hypertensive rats.

    • Main Results:

    • Hypertension abolished large arteriole constriction and small arteriole dilation during complement activation.
    • Hypertension attenuated but did not abolish endothelium-independent vasodilation to nitroprusside.
    • Blocking EDRF in hypertensive rats with hydroquinone revealed a constrictor mechanism in small arterioles during complement activation.

    Conclusions:

    • Renovascular hypertension alters skeletal muscle microcirculatory responses to complement activation.
    • A constrictor-producing mechanism counterbalances EDRF release in small arterioles during hypertension and complement activation.
    • Hypertension may modify receptor-level mechanisms affecting arteriolar function.