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. 1994 Nov 22;91(24):11378–11382. doi: 10.1073/pnas.91.24.11378

Human immunodeficiency virus type 1 strains in the lungs of infected individuals evolve independently from those in peripheral blood and are highly conserved in the C-terminal region of the envelope V3 loop.

S Itescu 1, P F Simonelli 1, R J Winchester 1, H S Ginsberg 1
PMCID: PMC45234  PMID: 7972068

Abstract

To determine whether human immunodeficiency virus type 1 (HIV-1) strains in the lungs of infected individuals are derived from proviral forms contemporaneously present in the peripheral blood or whether they evolve independently as an autonomous pool of viral quasispecies, HIV-1 envelope V3 domain structures at these sites were analyzed and compared. The V3 loop proviral nucleotide and inferred amino acid sequences from lung bronchoalveolar lavage, where HIV-1 is primarily found in macrophages, were more homogeneous within individuals than those from unseparated peripheral blood mononuclear cells, where virus is predominantly in T cells. Comparison between individuals revealed that strains from bronchoalveolar lavage, but not from peripheral blood mononuclear cells, contained V3 domain nucleotide sequences with a great degree of homogeneity in the C-terminal region and a highly conserved, negatively charged amino acid motif. This V3 loop C-terminal structure could be important in the ability of HIV-1 to infect alveolar macrophages. Phylogenetic analyses of V3 domain nucleotide sequences in cells of monocyte/macrophage lineage at both sites revealed the strains in lung macrophages to have evolved further from a presumed ancestral species than those in blood monocytes and to differ considerably in the inferred V3 loop amino acid structures. These results show that, as disease progression occurs, viral strains in monocyte/macrophage lineage cells within the lung and blood microenvironments are not in a state of unrestricted bidirectional traffic but, instead, evolve independently.

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Selected References

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