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Electromechanical coupling and the conducted vasomotor response

J Xia1, B R Duling

  • 1Department of Molecular Physiology and Biological Physics, School of Medicine, University of Virginia, Charlottesville 22908, USA.

The American Journal of Physiology
|December 1, 1995
PubMed
Summary

Conducted vasomotor responses in microvessels are driven by electrical signals. These electrical signals must exceed a threshold to trigger a mechanical constriction, integrating microvascular function.

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Area of Science:

  • Physiology
  • Microcirculation
  • Vascular Biology

Background:

  • Conducted vasomotor responses are crucial for integrating microvascular function.
  • The underlying mechanism is hypothesized to involve electrical current spread along microvessels.

Purpose of the Study:

  • To test the hypothesis that conducted vasomotor responses result from electrical current spread.
  • To investigate the relationship between electrical signals and mechanical responses in arterioles.

Main Methods:

  • Isolated arterioles from hamster cheek pouch were used.
  • Conventional intracellular membrane potential recording techniques were employed.
  • Stimulation with KCl and phenylephrine (PE) was performed using micropipettes.

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Main Results:

  • Both KCl and PE induced local and conducted depolarizations and vasoconstrictions.
  • Conducted vasomotor responses required electrical signals to exceed a threshold of -45 mV for a minimum duration.
  • Nifedipine reduced mechanical responses but not electrical responses, indicating voltage-gated calcium channel involvement.

Conclusions:

  • Conducted vasomotor responses are indeed mediated by the generation and conduction of electrical signals.
  • Mechanical constriction occurs only when the electrical signal exceeds a specific threshold.
  • This provides evidence for an electrotonic spread mechanism integrating microvascular network activity.