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Complex changes in the brain's vascular system occur after menopause
Date:6/16/2008

COLUMBIA, Mo. Many women experience menopausal changes in their body including hot flashes, moodiness and fatigue, but the changes they don't notice can be more dangerous. In a new study, researchers at the University of Missouri have discovered significant changes in the brain's vascular system when the ovaries stop producing estrogen. MU scientists predict that currently used estrogen-based hormone therapies may complicate this process and may do more harm than good in postmenopausal women.

"Before menopause, women are much more protected from certain conditions such as heart disease and stroke, but these vascular changes might explain why women lose this protection after menopause," said Olga Glinskii, research assistant professor of medical pharmacology and physiology in MU's School of Medicine and lead author of the study. "Because the body eventually will naturally adapt to the loss of estrogen, we advise extreme caution when using estrogen-based therapy in postmenopausal women."

In their study, MU researchers removed the ovaries of pigs, which have a reproductive cycle similar to humans, to create postmenopausal conditions. Two months after the ovaries were removed, they observed dramatic differences in the brain's vascular system. There was a huge loss of micro vessels, and blood vessels became "leaky."

"Eventually, however, the body starts to recognize that it needs blood vessels and starts to adapt through natural responses," said Vladislav Glinskii, assistant professor of pathology and anatomical sciences in MU's School of Medicine, research health scientist at Harry S. Truman Memorial Veterans' Hospital and co-senior author of the study. "If we start adding estrogen to a system that is learning to adapt without it, we upset this transition process. What happens to the vascular system during menopause is complex on many different levels, and we do not know enough to determine the best way to use hormone therapy."

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Contact: Kelsey Jackson
JacksonKN@missouri.edu
573-882-8353
University of Missouri-Columbia
Source:Eurekalert

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