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New study suggests link between estrogen exposure, high blood pressure
Date:5/26/2011

EAST LANSING, Mich. While recent studies have shown long-term exposure to estrogen can be a danger to women overturning physicians' long-held beliefs that the hormone was good for their patients' hearts the process by which estrogen induces high blood pressure was unclear.

In a new study, Michigan State University researchers found long-term estrogen exposure generates excessive levels of the compound superoxide, which causes stress in the body. The buildup of this compound occurs in an area of the brain that is crucial to regulating blood pressure, suggesting that the estrogen-induced buildup causes increased blood pressure.

Findings indicated that the anti-oxidant resveratrol reverses the increase in both superoxide and blood pressure.

The study, led by P.S. MohanKumar, an associate professor of pathobiology and diagnostic investigation in the College of Veterinary Medicine, appears in the American Journal of Physiology Regulatory, Integrative, and Comparative Physiology. The journal is published by the American Physiological Society.

"This is an important study on at least two levels," MohanKumar said. "First, it continues to confirm the negative effect that long-term estrogen exposure has for females. Second, it provides a new rationale for how and why this relationship occurs."

Researchers looked to the rostral ventrolateral medulla, a critical region in the brain stem involved with the maintenance of blood pressure and thought to be associated with hypertension and heart failure.

Believing that chronic exposure of estrogen could influence this area of the brain, they conducted a two-phase experiment using rats, injecting them first with estrogen and then also feeding them the anti-oxidant resveratrol. MohanKumar and his team found chronic exposure caused a significant increase in superoxide in the rostral ventrolateral medulla and in blood pressure. The team also found resveratrol reve
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Contact: Jason Cody
codyja@msu.edu
517-432-0924
Michigan State University
Source:Eurekalert  

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