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Drug Used to Prevent HIV Transmission from Mother to Child Damages DNA

HIV transmission from mother to child can occur in utero, during labor or from breastfeeding. If left untreated, approximately 25 percent of newborns// exposed to the virus from their infected mothers will become infected themselves and potentially develop AIDS. Fortunately, antiretroviral drug combinations, which typically include AZT (zidovudine), a nucleoside reverse transcriptase inhibitor (NRTI), have reduced the rate of transmission from mother to child to less than 2 percent in infants who are not breast fed.

NRTIs work by inhibiting the viral reverse transcriptase and by incorporating into the viral DNA and terminating nascent strands, thus preventing the virus from duplicating. However, previous research has shown that NRTIs also incorporate into the DNA of host cells, causing damage that could have long-term health consequences for those exposed to the drugs.

Two new animal studies have examined the cancer-causing effects of transplacental exposure to AZT in mice and rats and found increased rates of tumors and tumors with gene changes that frequently occur in human cancer. In addition, two human studies are the first to observe the induction of mutations and large scale chromosomal damage in red blood cells of newborns exposed to NRTIs in utero.

Researchers led by Dale M. Walker of Experimental Pathology Laboratories in Herndon, VA, administered AZT in varying doses to female mice and rats during the last 7 days of gestation and examined the tissue of their offspring two years later. They found clear evidence of an AZT-induced increase in the incidence of hemangiosarcoma (cancer originating in cells that line the blood vessels) in male mice and mononuclear cell leukemia in female rats.

There was also some evidence of increased liver cancer and reproductive tumors. "Although the implications of these findings for the long-term health of human children exposed tranplacentally to AZT are uncertain, the possib
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TAG: Drug Used Prevent HIV Transmission from Mother Child Damages DNA

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