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Related Experiment Videos

Spontaneous hypertension: a humoral component.

G L Wright1, M E Rogerson, W D McCumbee

  • 1Department of Physiology, School of Medicine, Marshall University, Huntington, WV 25704-2901.

Clinical and Experimental Hypertension. Part A, Theory and Practice
|January 1, 1987
PubMed
Summary

A novel hypertensive factor (HF) from rat erythrocytes elevates blood pressure and increases aortic calcium in normotensive rats. This factor enhances calcium uptake, suggesting a new mechanism in hypertension research.

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Area of Science:

  • Cardiovascular Physiology
  • Biochemistry

Background:

  • Spontaneously hypertensive rats (SHR) are a key model for studying hypertension.
  • Erythrocytes are increasingly recognized for their role in cardiovascular regulation.

Purpose of the Study:

  • To isolate and characterize a hypertensive factor (HF) from rat erythrocytes.
  • To investigate the effects of HF on blood pressure and aortic calcium metabolism in normotensive rats.

Main Methods:

  • Partial purification of a hypertensive factor from rat erythrocytes.
  • Intravenous injection of the factor into normotensive rats.
  • Measurement of blood pressure response over time.
  • Assessment of "lanthanum-resistant" calcium concentration in excised aortae.
  • Analysis of calcium efflux from aortic tissue.

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Main Results:

  • The purified factor (HF) induced sustained hypertension in normotensive rats, with a delayed onset and prolonged duration.
  • HF significantly increased "lanthanum-resistant" calcium in aortae from both normotensive and hypertensive rats.
  • Enhanced calcium efflux was observed, indicating increased calcium uptake rather than decreased extrusion.

Conclusions:

  • Erythrocytes contain a factor that can induce sustained hypertension.
  • This hypertensive factor alters aortic calcium handling, primarily by increasing calcium uptake.
  • The findings suggest a novel erythrocyte-derived mechanism contributing to hypertension.