Inhibition of HIV‐1 Replication in Human Lymphoid Tissues Ex Vivo by Measles Virus
1Laboratory of Molecular and Cellular Biophysics, National Institute of Child Health and Human Development, Bethesda, 2W. Harry Feinstone Department of Molecular Microbiology and Immunology and 3Cellular Molecular Medicine, School of Medicine, Johns Hopkins University, and 4Department of Epidemiology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland
Human immunodeficiency virus (HIV) type 1 replication and disease progression are enhanced by various pathogens in coinfected individuals. However, acute infection with measles virus (MV) has been found to suppress HIV‐1 replication in coinfected children. We investigated the mechanisms of this phenomenon using human lymphoid tissues coinfected ex vivo with HIV‐1 and MV. MV inhibited both CXCR4‐tropic (X4) and CCR5‐tropic (R5) HIV‐1, but the inhibitory effect was particularly profound for R5 virus, which transmits infection and dominates the early stages of HIV‐1 disease. MV inhibits the replication of R5 HIV‐1 in coinfected tissues by up‐regulation of the CC chemokine RANTES, a well‐known inhibitor of R5 HIV‐1 infection, and this up‐regulation is augmented in tissues coinfected with R5 HIV‐1. Deciphering the molecular mechanisms by which MV and other pathogens alter local cytokine/chemokine networks and cause tissue microenvironments to become detrimental to HIV‐1 may significantly contribute to the development of effective anti‐HIV therapies.
Received 18 December 2004; accepted 9 February 2005; electronically published 31 May 2005.
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Financial support: National Institute of Child Health and Human Development Intramural Program (to J.‐C.G. and L.B.M.); Elizabeth Glaser Pediatric AIDS Foundation (grant PG‐51331 to M.G. and W.J.M.).





