DC-specific ICAM-3-grabbing nonintegrin mediates internalization of HIV-1 into human podocytes

J Mikulak, S Teichberg, S Arora, d kumar, D Kumar, A Yadav, D Salhan, S Pullagura, PW Mathieson, MA Saleem, P Singhal

Research output: Contribution to journalArticle (Academic Journal)peer-review

25 Citations (Scopus)


Human immunodeficiency virus (HIV)-1 has been demonstrated to contribute to the pathogenesis of HIV-associated nephropathy. In renal biopsy studies, podocytes have been reported to be infected by HIV-1. However, the mechanism involved in HIV-1 internalization into podocytes is not clear. In the present study, we evaluated the occurrence of HIV-1 internalization into conditionally immortalized human podocytes and the mechanism involved. Human podocytes rapidly internalized R5 and X4 HIV-1 primary strains via an endocytosis-dependent pathway, without establishing a productive infection. The HIV-1 internalization was dendritic cell-specific ICAM-3-grabbing nonintegrin (DC-SIGN) receptor mediated. The role of DC-SIGN was confirmed by using specific blocking antibodies and transfection with small interfering (si) RNA/DC-SIGN. Since podocyte HIV-1 trafficking was not altered by pH-modulating agents, it appeared that HIV-1 routing occurred through nonacid vesicular compartments. Interestingly, transfection of podocytes with neither siRNA/caveolin-1 nor siRNA/clathrin heavy chain inhibited podocyte viral accumulation. Thus it appears that clathrin-coated vesicles and caveosomes may not be contributing to HIV-1-associated membrane traffic.
Translated title of the contributionDC-specific ICAM-3-grabbing nonintegrin mediates internalization of HIV-1 into human podocytes
Original languageEnglish
Pages (from-to)F664 - F673
Number of pages10
JournalAJP - Renal Physiology
Publication statusPublished - Sept 2010


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    Mathieson, P. W.


    Project: Research

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