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J Virol. 1997 Feb;71(2):1657-61.

Macrophage tropism of human immunodeficiency virus type 1 and utilization of the CC-CKR5 coreceptor.

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  • 1Aaron Diamond AIDS Research Center, The Rockefeller University, New York, New York 10021-6399, USA.


The recent identification of the CC-CKR5 beta chemokine receptor as a major cofactor for entry of macrophage-tropic isolates of human immunodeficiency virus type 1 (HIV-1) raises the question of whether macrophage tropism is determined by utilization of this chemokine receptor. We observe that in addition to macrophage-tropic isolates of clades A, B, and E, macrophage-tropic isolates of clade F also utilize the CC-CKR5 molecule for entry. However, using single-round replication-competent reporter viruses carrying the envelope genes of T-cell line-tropic or macrophage-tropic phenotypic recombinant and mutant HIV-1 strains in infection of stable cell lines that coexpress the CD4 and chemokine receptors, we were unable to establish a strict correlation between macrophage tropism and utilization of the CC-CKR5 chemokine receptor. This latter finding suggests that a cofactor other than CC-CKR5 serves to determine entry into primary macrophages.

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