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Related Experiment Videos

Capillary as a communicating medium in the microvasculature.

H H Dietrich1, K Tyml

  • 1Department of Medical Biophysics, University of Western Ontario, London, Canada.

Microvascular Research
|January 1, 1992
PubMed
Summary

Local norepinephrine application on capillaries reduces blood flow by constricting arterioles. This study investigated how the signal travels, finding capillaries themselves may act as the communication pathway, not nerves or diffusion.

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Area of Science:

  • Physiology
  • Microcirculation Research
  • Skeletal Muscle Biology

Background:

  • Norepinephrine (NE) locally applied to capillaries reduces blood flow via arteriole constriction.
  • The mechanism of signal propagation from capillary to arteriole remains unclear.

Purpose of the Study:

  • To elucidate the mechanism of norepinephrine-induced signal propagation from capillaries to supplying arterioles.
  • To investigate the role of capillaries as a potential communication medium in microcirculation.

Main Methods:

  • Intravital video microscopy in frog sartorius muscle.
  • Measurement of red blood cell velocity in capillaries and arteriole diameter.
  • Iontophoretic application of norepinephrine with various blockers (tetrodotoxin, lidocaine, yohimbine) and capillary damage via microcautery.

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Main Results:

  • Tetrodotoxin did not inhibit NE-induced velocity reduction; lidocaine attenuated it.
  • Yohimbine blocked the response only when co-applied with NE.
  • Capillary damage abolished NE-induced arteriolar constriction.
  • NE-induced capillary blood flow reduction was observed (0.2 to 0.07 mm/sec).

Conclusions:

  • The findings rule out direct diffusion, adrenergic nerve conduction, and venous-arteriolar cross-talk.
  • Data suggest capillaries can act as a communicating medium for signal propagation in microcirculation.