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Mouse mammary tumor virus can replicate in human cells
Date:10/10/2007

Mouse mammary tumor virus (MMTV) - which causes mammary cancer in mice - can replicate and spread in human cells, research published this week shows. The study, published in the online open access journal Retrovirology, adds weight to the theory that MMTV might be involved in causing human breast cancer.

The idea that MMTV is involved in human breast cancer has been around for over 50 years. In the 1990s, researchers detected MMTV in human breast tumors, but not in healthy breast tissue. The link between MMTV and human breast cancer was contentious though, as some scientists believed the presence of MMTV in tumors was caused by contamination rather than infection.

However, two years ago, researchers from the University of Veterinary Medicine, Austrianova Biotechnology and the Christian-Doppler Laboratory for Gene Therapeutic Vector Development, all based in Vienna, Austria, showed that MMTV does actually infect human cells.

Now, they have added to these findings with this latest study, which shows that MMTV can replicate in cultured human breast cells. The new virus particles produced by the infected cells enabled the virus to spread rapidly, leading to the infection of every cell in culture.

"It has recently been shown convincingly that MMTV can infect human cells. Often, however, viruses infect cells but cannot replicate further. If they can replicate, the chances that they cause disease may be increased," says Dr Stanislav Indik from the University of Veterinary Medicine, Vienna and one of the study's authors.

There are a number of questions still to be answered before a concrete role of MMTV in human breast cancer is established, including whether MMTV can infect primary cells - those taken directly from the body, not from a cultured cell line. Also, researchers plan to investigate how the virus spreads from mice to humans, and to examine if one of the possible outcomes of human MMTV infection is breast cancer.<
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Contact: Charlotte Webber
press@biomedcentral.com
44-020-763-19980
BioMed Central
Source:Eurekalert

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