A soluble inhibitor of T lymphocyte function induced by HIV-1 infection of CD4+ T cells: characterization of a cellular protein and its relationship to p15E.

Journal Article (Journal Article)

Soluble suppressor factor (SSF), first described in association with HIV-1 infection in vivo, is a molecule(s) capable of inhibiting T cell-dependent immune reactivity. Its relationship to human immunodeficiency virus (HIV) was further defined as supernatants of mononuclear cell cultures from HIV-1-seropositive carriers, CD4+ T lymphocytes infected with HIV-1 in vitro, and a T cell hybridoma incorporating CD4+ lymphocytes from an HIV-1-seropositive individual were shown to elaborate factors with similar activity profiles. These factors were recognized antigenically by certain antibodies directed against epitopes of p15E, a transmembrane protein of murine leukemia virus which shares regions of identity with proteins deduced from human endogenous retroviral envelope transcripts as well as HIV. These reagents precipitated a single-chain, nonglycosylated, nonviral protein of molecular weight 57,000 Da from SSF-producing cells. There was no cross-reactivity with antisera recognizing the IL-2R alpha-chain (CD25) or tumor necrosis factor. This molecule was present in very low levels in PHA-activated T lymphocytes and was upregulated following their infection with HIV-1. Isolation of HIV-linked SSF should permit comparisons with other virion, cellular, and serum inhibitory substances described in AIDS, and perhaps suggest therapeutic strategies.

Full Text

Duke Authors

Cited Authors

  • Laurence, J; Kulkosky, J; Dong, B; Early, E; Snyderman, R; Cianciolo, GJ

Published Date

  • July 1, 1990

Published In

Volume / Issue

  • 128 / 2

Start / End Page

  • 337 - 352

PubMed ID

  • 1694108

International Standard Serial Number (ISSN)

  • 0008-8749

Digital Object Identifier (DOI)

  • 10.1016/0008-8749(90)90031-l


  • eng

Conference Location

  • Netherlands