1887

Abstract

SDZ NIM 811 is a cyclosporin A (CsA) analogue that is completely devoid of immunosuppressive capacity but exhibits potent and selective antihuman immunodeficiency virus type 1 (HIV-1) activity. Binding to cyclophilin A, the intracellular receptor for cyclosporins, is a prerequisite for HIV-1 inhibition by cyclosporins. Cyclophilin A was demonstrated to bind to HIV-1 p24 and this cyclophilin-Gag interaction leads to the incorporation of cyclophilin Ainto HIV-1 virions. SDZ NIM 811 inhibitsthis protein interaction, and this is likely to be the molecular basis for its antiviral activity. Here, we show that in activated primary T cells SDZ NIM 811 interferes with two stages of the virus replication cycle: (i) translocation of pre-integration complexes into the nucleus and (ii) production of infectious virus particles. SDZ NIM 811 not only inhibits translocation of HIV-1 pre-integration complexes in primary T cells, but also in a growth-arrested T cell line. , most T lymphocytes are quiescent, but serve nevertheless as a major and inducible HIV-1 reservoir in infected individuals. Significant amounts of cyclophilin A were found to be associated with virus particles propagated in primary T cells. SDZ NIM 811 caused a strong reduction in the amount of incorporated cyclophilin A, thereby reducing infectivity. Thus, cyclophilin A seems to be necessary for HIV-1 replication in primary T cells.

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1997-04-01
2022-12-09
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