Published Online
on June 28, 2004

A more recent version of this article appeared on July 13, 2004

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Submitted on January 4, 2004
Revised on March 9, 2004
Accepted on March 22, 2004

Strain-Dependent Vascular Remodeling. The "Glagov Phenomenon" Is Genetically Determined

Vyacheslav A. Korshunov PhD and Bradford C. Berk MD, PhD^*

From the Center for Cardiovascular Research and Department of Medicine, University of Rochester, Rochester, NY.

^* To whom correspondence should be addressed. E-mail: bradford_berk{at}urmc.rochester.edu.

Background--Atherosclerosis of the carotid artery, called intima-media thickening (IMT), is a form of vascular remodeling that is an important predictor for cardiovascular events and has a strong genetic component.

Methods and Results--Recently, we established a mouse model of vascular remodeling based on partial ligation of the carotid, which is relevant to the "Glagov phenomenon." We hypothesized that there would be genetically determined differences in outward remodeling and IMT induced by carotid flow alterations. We compared vascular remodeling among 5 inbred strains of mice. Despite similar changes in flow among the strains in the left carotid artery (LCA), we observed dramatic differences in remodeling of the partially ligated LCA relative to control. The smallest IMT volume (26±3 µm³) was found in C3H/HeJ mice, and the largest were in SJL/J (59±10 µm³) and FVB/NJ (81±6 µm³). Shear stress did not differ after ligation among strains. Lumen area decreased only when stenosis was 55%. IMT correlated significantly with outward remodeling among inbred strains (except C3H). There were significant strain-dependent differences in remodeling index (measured as vessel area/IMT), which suggest fundamental alterations in sensing or transducing hemodynamic signals among strains. Among hemodynamic factors, low shear stress and high heart rate were predictive for IMT. Specifically, heart rate (bpm: C3H, 592±6; SJL, 649±6; FVB, 683±7) but not systolic blood pressure (mm Hg: C3H, 116±2; SJL, 119±1; FVB, 136±1) was predictive.

Conclusions--The present study indicates that performing a genetic cross of these strains and total genome scan should identify genes that mediate vascular remodeling.

Key words: carotid arteries • remodeling • blood flow • Glagov phenomenon

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