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Early life stress may predict cardiovascular disease
Date:2/9/2010

Early life stress could be a risk factor for cardiovascular disease in adulthood, researchers report.

"We think early life stress increases sensitivity to a hormone known to increase your blood pressure and increases your cardiovascular risk in adult life," said Dr. Jennifer Pollock, biochemist in the Vascular Biology Center at the Medical College of Georgia and corresponding author on the study published online in Hypertension.

The studies in a proven model of chronic behavioral stress separating rat pups from their mother three hours daily for two weeks showed no long-term impact on key indicators of cardiovascular disease such as increased blood pressure, heart rate or inflammation in blood vessel walls.

But when the rats reached adulthood, an infusion of the hormone angiotensin II resulted in rapid and dramatic increases in all key indicators in animals that experienced early life stress. Stress activates the renin-angiotensin system which produces angiotensin II and is a major regulator of blood vessel growth and inflammation both heavily implicated in heart disease. "They cannot adapt to stress as well as a normal animal does," Dr. Pollock said. Within a few days, for example, blood pressure was nearly twice as high in the early-stress animals.

The chronic stress model most typically has been used to look at the psychological impact of childhood stress; this was the first time it was used to measure cardiovascular impact, Dr. Pollock said. Findings correlate with studies published in Circulation in 2004 that identified adverse childhood events, such as abuse or parental loss, in the backgrounds of many adults with ischemic heart disease.

"We want to be able to prevent this long-term consequence," said Dr. Analia S. Loria, MCG postdoctoral fellow and the study's first author. Although the adult rats seemed fine until stressed, the scientists noted the inevitability of stress in life.

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Contact: Toni Baker
tbaker@mcg.edu
706-721-4421
Medical College of Georgia
Source:Eurekalert  

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