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DES Info: Diethylstilbestrol in utero affects immune system of the fetus

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A synthetic estrogen — diethylstilbestrol (DES), prescribed to women in the 1940s, 1950s, 1960s and into the 1970s miscarriages, had serious, untoward effects in daughters of these women, including the development of a rare type of cancer of the uterus. There has been renewed interest in light of an Oct. 6, 2011 report in the New England Journal of Medicine documenting lifelong health complications facing daughters of women given DES.

 

Reproductive tissues are not the only targets of DES. The immune system is also known to be a target for estrogens. Dr. S. Ansar Ahmed, professor of immunology at Virginia Tech, led a National Institutes of Health study in the 1990s on how exposure to DES in utero affects the immune system later in life using a mouse model.

 

"We decided to look at how giving DES to mothers changes the immune system after birth," Ahmed said. "Exposure to hormones such as DES can create a different environment for the fetal immune system. This is a very sensitive time in the 'education' of the immune system. Exposure of the fetus to DES during this sensitive time can interfere with this 'education' of the immune system."

 

According to Ahmed, many disorders resulting from prenatal exposure to DES become evident after puberty and maturity. This suggested to Ahmed and his colleagues that individuals exposed to DES prenatally might have a "deviant or more sensitive" response to their own sex hormones at maturity.
The New England Journal of Medicine report found that women whose mothers took DES have significantly higher rates of a number of reproductive problems, including infertility, miscarriage, and premature births. There are more than 2 million women in the United States who were exposed to DES in utero.

 

The U.S. Food and Drug Administration banned pregnant women from using the drug after a 1971 study found that it caused a rare vaginal tumor in girls and women exposed to it.

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Source: New England Journal of Medicine 2011

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Karen M. Fernandes
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