title: HIV-1 gp41 selectively inhibits spontaneous cell proliferation of human cell lines and mitogen- and recall antigen-induced lymphocyte proliferation.
abstract: Human immunodeficiency virus type 1 (HIV-1) transmembrane glycoprotein 41 (gp41) contains an immunosuppressive domain (Env amino acids 583-599). Previous studies by us and others using recombinant soluble gp41 (rsgp41; amino acids 539-684) and immunosuppressive peptide (1SP; a gp41 peptide, amino acids 583-599) have shown that HIV-1 gp41 by the immunosuppressive domain could bind to several proteins on human T, B and monocyte cell lines, and also to normal human peripheral blood mononuclear cells. In this study we demonstrated that HIV-1 rsgp41 could inhibit spontaneous cell proliferation of human T cell lines H9 and Jurkat, B cell lines Raji and Daudi, monocyte cell line U937, but could not inhibit cell proliferation of human fibroblast cell line HEF and green monkey kidney cell line Cos-1. HIV-1 rsgp41 could inhibit also concanavalin A (Con A)-, phytohaemagglutinin (PHA)- and tetanus toxoid (TT)-induced cell proliferation of normal human peripheral blood lymphocytes, with 50% inhibition at a concentration of 8 microM, but could not inhibit pokeweed mitogen (PWM)-induced lymphocyte proliferation. Furthermore, recombinant soluble gp36 of HIV-2 like HIV-1 rsgp41 could inhibit Con A-, but not PWM-induced lymphocyte proliferation. These results indicate that HIV-1 gp41-induced inhibition of proliferation is selective in so far as the effect of PWM is not altered while the effects of several other stimuli are.
authors.affiliation: Ludwig-Boltzmann-Institute for AIDS Research, University of Innsbruck, Austria.
authors.forename: Y H
authors.initials: YH
authors.lastname: Chen
authors.forename: A
authors.initials: A
authors.lastname: Christiansen
authors.forename: M P
authors.initials: MP
authors.lastname: Dierich
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001402:B-Lymphocytes / Q000378:metabolism; D002455:Cell Division / Q000187:drug effects*; D002460:Cell Line; D002522:Chlorocebus aethiops; D005347:Fibroblasts / Q000378:metabolism; D015686:Gene Products, env / Q000494:pharmacology; D015488:HIV Antigens / Q000494:pharmacology; D015700:HIV Envelope Protein gp41 / Q000276:immunology / Q000494:pharmacology*; D006801:Humans; D007963:Leukocytes, Mononuclear / Q000378:metabolism; D008213:Lymphocyte Activation / Q000187:drug effects*; D008934:Mitogens / Q000276:immunology; D008969:Molecular Sequence Data; D009000:Monocytes / Q000378:metabolism; D011994:Recombinant Proteins / Q000276:immunology; D013601:T-Lymphocytes / Q000378:metabolism; D054299:env Gene Products, Human Immunodeficiency Virus
chemical_list: D015686:Gene Products, env; D015488:HIV Antigens; D015700:HIV Envelope Protein gp41; D008934:Mitogens; D011994:Recombinant Proteins; D054299:env Gene Products, Human Immunodeficiency Virus; C059763:env protein gp36, Human immunodeficiency virus