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Study in Circulation provides detail on how low blood flow promotes vascular disease
Date:6/23/2008

aused the accumulation of inflammatory cells, an important component in the disease-related thickening of vessel walls. The effects were pronounced in the mice with extra capacity for CyPA production, and lessened in those with less CyPA.

Specifically, the current study demonstrated for the first time in a live animal that cyclophilin A (CyPA) is secreted specifically by smooth muscle cells in response to the production of reactive oxygen species with several consequences. First, CyPA signals for the production of pro-inflammatory molecules like E-selectin and vascular cell adhesion molecule 1 (VCAM-1), both of which call in immune cells circulating in the blood to the site of a cholesterol deposit in blood vessel wall and enable them to stick to it. This represents a first step in the inflammatory component of plaque formation.

The team also showed CyPA stimulates important pathways (e.g. the ERK1/2 and JAK/STAT) that drive smooth muscle cells to divide and grow. Furthermore, CyPA may activate matrix metalloproteinases, enzymes that break down the barrier that usually keeps smooth muscle cells out of the intima, the site of their disease-related proliferation.


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Contact: Greg Williams
Greg_Williams@urmc.rochester.edu
585-273-1757
University of Rochester Medical Center
Source:Eurekalert

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