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2003 JAN 1 - (NewsRx.com & NewsRx.net) -- by Michael Greer, senior medical writer - Researchers in the United States have identified a genetic factor that protects primates against AIDS.
Zhi-Qiang Zhang and colleagues working at Merck Research Laboratories in West Point, Pennsylvania, " investigated the expression of the MHC class I allele Mamu-A*01 in simian-human immunodeficiency virus (SHIV) infection, one of the major models for evaluation of AIDS vaccine candidates."
This allele was associated with delayed disease progression and a lower degree of lymphoid tissue damage, Zhang and coauthors found.
The researchers examined the impact of Mamu-A*01 expression in rhesus monkeys. Study animals were infected with the extremely virulent 89.6P strain of SHIV, they noted.
Rhesus monkeys positive for Mamu-A*01 demonstrated significantly slower disease progression than animals without this allele. Delayed progression was partly due to potent and Mamu-A*01-restricted cytotoxic T-lymphocyte (CTL) activity, according to the report.
In addition, Mamu-A*01 expression prevented the "massive" lymph node damage seen in infected animals lacking this allele ...