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| | Landmark Discovery of a Kaposi’s Sarcoma-Associated Herpesvirus Receptor Provides New Perspectives |
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date: Apr 8th 2006 15:29
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on Disease Associated with HIV AIDS. Researchers at the National Institute of Allergy and Infectious Disease (NIAID), a component of the National Institutes of Health (NIH),
have identified a critical human cell surface molecule involved in infection by Kaposi’s sarcoma herpesvirus (KSHV), the virus that causes Kaposi’s sarcoma and certain forms of lymphoma. Kaposi’s sarcoma is a major cancer associated with HIV/AIDS, and it typically manifests as multiple purple-hued skin lesions.
In the March 31, 2006 issue of Science, NIAID research fellow Johnan Kaleeba, Ph.D. and senior investigator Edward A. Berger Ph.D., describe how the molecule xCT is a major gateway that KSHV uses to enter human cells. The molecule may also play a role in the development of Kaposi’s sarcoma and other syndromes associated with the virus.
The natural function of xCT in the body is to transport molecules necessary for protecting against stress into cells. When cells are stressed, they express more xCT on their surfaces. Of note, this sort of stress can be caused by KSHV itself. This suggests that the virus may facilitate its own infectivity and dissemination in the body by inducing a physiological state that results in increased numbers of its own receptor.
“The advancement of knowledge achieved in this study highlights the outstanding intramural research that takes place here on the NIH campus,” says Elias A. Zerhouni, M.D., NIH director.
“Understanding the mechanisms of cell entry of Kaposi’s sarcoma herpesvirus is a landmark achievement in and of itself,” says NIAID director Anthony S. Fauci, M.D. “But the connection between the virus and expression of its own receptor on a cell is even more provocative because it might change the way we think about KSHV-associated diseases and their treatment.”
Although less common in the United States now than early in the AIDS pandemic, Kaposi’s sarcoma is still the most common cancer associated with HIV infection. Prior to the AIDS pandemic, it was an obscure disease. First identified as a multi-pigmented skin disease by a Hungarian doctor named Moritz Kaposi in 1872, it was considered to be quite rare — a medical curiosity usually found in particular populations such as older Italian men, transplant patients and young men in certain parts of sub-Saharan Africa. But then at the dawn of the AIDS pandemic in the early 1980s, the small purplish Kaposi’s sarcoma skin lesions began appearing on the bodies of young American men, many of whom went on to develop opportunistic infections.
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article 'Landmark Discovery of a Kaposi’s Sarcoma-Associated Herpesvirus Receptor Provides New Perspectives' source is National Institutes of Health - U.S. Department of Health, visit source site:
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