Kinomoto M, Mukai T, Li YG, Iwabu Y, Warachit J, Palacios JA, Ibrahim MS, Tsuji S, Goto T, Ikuta K. Enhancement of human immunodeficiency virus type 1 infectivity by replacing the region including Env derived from defective particles with an ability to form particle-mediated syncytia in CD4+T cells.
Microbes Infect 2004;
6:911-8. [PMID:
15310467 DOI:
10.1016/j.micinf.2004.05.003]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2004] [Accepted: 05/01/2004] [Indexed: 11/23/2022]
Abstract
The infection and subsequent replication rates of human immunodeficiency virus type 1 (HIV-1) affect the pathogenicity. The initial stage of HIV-1 infection is largely regulated by viral envelope sequence. We previously reported that the defective doughnut-shaped particles produced from a persistently infected cell clone, named L-2, obtained from human CD4+ T-cell line MT-4 that was persistently infected with HIV-1 LAI strain, efficiently form particle-mediated syncytia with uninfected human CD4+ T-cell line, MOLT-4. Here, we prepared a molecular clone (pL2) containing the L-2 provirus to characterize the viral genetic region contributing to this activity to form particle-mediated syncytia. Several recombinants were constructed with pNL4-3 by replacing the pL2-derived region including full-length env. Characterization of the particles obtained by transfection with these recombinant clones confirmed that pL2-derived env carried the particle-mediated syncytia formation activity. It is noteworthy that the pL2-derived env region could also contribute to enhancement of infectivity in CD4+ T-cell lines as well as primary peripheral blood mononuclear cells (PBMCs). Thus, the HIV-1 particle-mediated syncytium formation activity could also contribute to the enhancement of HIV-1 infectivity.
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