The Journal of Experimental Medicine
Cytokines in immune regulation
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Published online 9 April 2001.
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© The Rockefeller University Press, 0022-1007/2001/4/905/ $5.00
The Journal of Experimental Medicine, Volume 193, Number 8, April 16, 2001 905-916


Original Article

Perivascular Macrophages Are the Primary Cell Type Productively Infected by Simian Immunodeficiency Virus in the Brains of Macaques: Implications for the Neuropathogenesis of AIDS

Kenneth C. Williamsa, Sarah Coreya, Susan V. Westmorelanda, Doug Pauleya, Heather Knighta, Colin deBakkera, Xavier Alvareza, and Andrew A. Lacknera
a Division of Comparative Pathology, New England Regional Primate Research Center, Harvard Medical School, Southborough, Massachusetts 01772

Correspondence to: Kenneth C. Williams, Division of Viral Pathogenesis, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, RE-113, P.O. Box 15732, Boston, MA 02215. Tel:617-667-2064 Fax:617-667-8210 E-mail:kenneth_williams{at}hms.harvard.edu.

The macrophage is well established as a target of HIV and simian immunodeficiency virus (SIV) infection and a major contributor to the neuropathogenesis of AIDS. However, the identification of distinct subpopulations of monocyte/macrophages that carry virus to the brain and that sustain infection within the central nervous system (CNS) has not been examined. We demonstrate that the perivascular macrophage and not the parenchymal microglia is the primary cell productively infected by SIV. We further demonstrate that although productive viral infection of the CNS occurs early, thereafter it is not easily detectable until terminal AIDS. The biology of perivascular macrophages, including their rate of turnover and replacement by peripheral blood monocytes, may explain the timing of neuroinvasion, disappearance, and reappearance of virus in the CNS, and questions the ability of the brain to function as a reservoir for productive infection by HIV/SIV.

Key Words: central nervous system, microglia, brain macrophage, neuropathogenesis, HIV


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