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Atrial natriuretic factor increases vascular permeability.

W Lockette1, B Brennaman

  • 1Department of Medicine, Wayne State University School of Medicine, Detroit, Michigan.

Aviation, Space, and Environmental Medicine
|December 1, 1990
PubMed
Summary
This summary is machine-generated.

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Atrial natriuretic factor (ANF) increases capillary permeability to albumin, potentially explaining plasma volume loss and symptoms like facial edema observed during space motion sickness.

Area of Science:

  • Physiology
  • Cardiovascular Research
  • Space Medicine

Background:

  • Microgravity may increase central blood volume and atrial natriuretic factor (ANF) levels.
  • Elevated ANF is linked to edema in clinical syndromes.
  • Space motion sickness involves increased central blood volume and facial edema.

Purpose of the Study:

  • To investigate if atrial natriuretic factor (ANF) increases capillary permeability to plasma proteins.
  • To explore the role of ANF in microgravity-induced physiological changes.

Main Methods:

  • Conscious, nephrectomized rats received infusions of saline, ANF + saline, or hexamethonium + saline.
  • 125I-albumin and 14C-dextran were used to track vascular permeability.
  • Blood pressure and hematocrit were monitored throughout the experiment.

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Main Results:

  • ANF infusion significantly increased hematocrit compared to saline controls.
  • ANF increased the extravasation of 125I-albumin but not 14C-dextran.
  • ANF-induced hypotension did not fully explain increased albumin extravasation.

Conclusions:

  • Atrial natriuretic factor (ANF) increases capillary permeability to albumin.
  • This ANF effect may lead to plasma volume reduction.
  • ANF-mediated capillary leakage could contribute to space motion sickness symptoms.