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Related Concept Videos

Vascular Resistance01:20

Vascular Resistance

Vascular resistance is a critical concept in understanding blood flow dynamics in the circulatory system. It refers to the resistance that blood encounters as it flows through the blood vessels. This resistance is a key factor in determining blood pressure and cardiac workload.
The primary determinants of vascular resistance are vessel diameter, blood viscosity, and vessel length. Among these, vessel diameter plays the most significant role due to the fourth power relationship described by...

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Measuring the Stiffness of Ex Vivo Mouse Aortas Using Atomic Force Microscopy
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Inactivation of serum response factor contributes to decrease vascular muscular tone and arterial stiffness in mice.

Guillaume Galmiche1, Carlos Labat, Mathias Mericskay

  • 1UPMC, UR4, 7, quai St Bernard, 75005 Paris, France.

Circulation Research
|February 22, 2013
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Summary

Serum response factor (SRF) controls vascular smooth muscle tone and arterial stiffness. Its absence increases arterial elasticity by reducing vasoconstriction and cell-matrix adhesion.

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Last Updated: May 14, 2026

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10:35

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Assessment of Vascular Tone Responsiveness using Isolated Mesenteric Arteries with a Focus on Modulation by Perivascular Adipose Tissues
08:41

Assessment of Vascular Tone Responsiveness using Isolated Mesenteric Arteries with a Focus on Modulation by Perivascular Adipose Tissues

Published on: June 3, 2019

Area of Science:

  • Cardiovascular Biology
  • Molecular Biology
  • Physiology

Background:

  • Vascular smooth muscle (SM) cell phenotypic modulation contributes to age-related arterial stiffening.
  • Serum response factor (SRF) is a key transcription factor for SM genes maintaining vascular SM cell contractile function.

Purpose of the Study:

  • To investigate if SRF and its target genes influence intrinsic SM tone and arterial stiffness.
  • To elucidate the role of SRF in regulating vascular smooth muscle contractility and arterial mechanics.

Main Methods:

  • Generated SM-specific SRF knockout (SRF(SMKO)) mice by tamoxifen injection in adult transgenic mice.
  • Assessed arterial pressure, carotid thickness, distensibility, elastic modulus, and contractile responses in knockout and control mice.
  • Analyzed levels of contractile components, regulators, and integrins in SRF(SMKO) vascular tissues.

Main Results:

  • SRF(SMKO) mice exhibited lower arterial pressure and carotid thickness, with increased carotid artery elasticity.
  • Vasodilation was reduced in aorta and carotid arteries, while contractile response decreased in mesenteric arteries of SRF(SMKO) mice.
  • Impaired nitric oxide (NO) pathway and reduced contractile proteins, regulators, and integrins were observed in SRF(SMKO) aortas.

Conclusions:

  • SRF regulates vasoconstriction in mesenteric arteries through vascular SM cell phenotypic modulation and contractile protein gene expression.
  • Reduced vasomotor tone and cell-matrix attachment in SRF(SMKO) mice enhance arterial elasticity in large arteries.
  • SRF plays a critical role in maintaining vascular tone and arterial mechanical properties.