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Estrogen in the fight against schizophrenia
Date:1/20/2010

Many American women are prescribed estrogen to combat the negative effects of menopause, such as bone loss and mood swings. Now, new evidence from a Tel Aviv University study suggests that hormone replacement therapy might also protect them ― and younger women ― from schizophrenia as well.

Prof. Ina Weiner of Tel Aviv University's Department of Psychology and her doctoral student Michal Arad have reported findings suggesting that restoring normal levels of estrogen may work as a protective agent in menopausal women vulnerable to schizophrenia. Their work, based on an animal model of menopausal psychosis, was recently reported in the journal Psychopharmacology.

"We've known for some time that when the level of estrogen is low, vulnerability to psychotic symptoms increases and anti-psychotic drugs are less likely to work. Now, our pre-clinical findings show why this might be happening," says Prof. Weiner.

A hormonal treatment to address a behavioral condition

In their study, Weiner and Arad removed the ovaries of female rats to induce menopause-like low levels of estrogen and showed that this led to schizophrenia-like behavior. The researchers then tried to eliminate this abnormal behavior with an estrogen replacement treatment or with the antipsychotic drug haloperidol. Estrogen replacement therapy effectively alleviated schizophrenia-like behavior but haloperidol had no effect on its own. Haloperidol regained its effect in these rats when supplemented by estrogen.

"When the level of estrogen was low, we could see psychotic-like behavior in the animals. Moreover, the sensitivity to psychosis-inducing drugs went up, while the sensitivity to anti-psychotic drugs went down," Prof. Weiner says. This is exactly what we observe in women with low estrogen levels," she says. "But we also found that estrogen, all by itself, combats psychosis in both male and female rats." Furthermore, in low amo
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Contact: George Hunka
ghunka@aftau.org
212-742-9070
American Friends of Tel Aviv University
Source:Eurekalert  

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