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A Methodological Approach to Non-invasive Assessments of Vascular Function and Morphology
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Time-of-day variation in vascular function.

G C Rodrigo1, M Denniff1

  • 1Department of Cardiovascular Sciences, University of Leicester, Glenfield General Hospital, Leicester, UK.

Experimental Physiology
|July 31, 2016
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Summary
This summary is machine-generated.

Vascular resistance vessels show daily rhythm in constriction, influenced by endothelial nitric oxide synthase (eNOS) signaling. This daily variation in eNOS expression impacts blood pressure regulation, particularly during active periods.

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Area of Science:

  • Physiology
  • Circadian Biology
  • Vascular Biology

Background:

  • Blood pressure exhibits a daily variation, with a notable dip during rest periods.
  • Vasoconstriction, the narrowing of blood vessels, is tightly regulated by nitric oxide (NO) signaling from endothelial cells.
  • Endothelial nitric oxide synthase (eNOS) plays a crucial role in NO production and vascular function.

Purpose of the Study:

  • To investigate the role of endothelial nitric oxide signaling in the time-of-day variation of resistance vessel vasoconstriction.
  • To examine the correlation between eNOS expression levels and daily changes in vascular contractility.
  • To understand the physiological implications of these daily variations in vascular function.

Main Methods:

  • Isolated rat mesenteric arteries were used to assess time-of-day variations in contractile responses.
  • Vascular contractility was measured in response to phenylephrine, high potassium (K+), and acetylcholine.
  • Expression levels of endothelial nitric oxide synthase (eNOS) (mRNA and protein) were quantified.

Main Results:

  • Mesenteric arteries displayed a significant time-of-day variation in contractile responses.
  • Reduced vasoconstriction to phenylephrine and enhanced vasodilation to acetylcholine were observed during the rat's active period.
  • Increased eNOS signaling and expression levels correlated with these daily variations, suggesting a role for peripheral circadian clocks.

Conclusions:

  • Endothelial nitric oxide signaling exhibits a pronounced time-of-day variation in resistance vessels.
  • This daily rhythm in eNOS activity influences vascular contractility and may contribute to the regulation of blood pressure throughout the day.
  • The findings suggest that circadian regulation of eNOS is critical for managing peripheral resistance and blood pressure fluctuations.