title: HIV type 1 V3 peptide constructs act differently on HIV type 1 infection of peripheral blood lymphocytes and macrophages.
abstract: We have previously shown that a multibranched peptide construct derived from the tip of the B clade V3 loop consensus sequence (MPBC1: [GPGRAF]8-[K]4-[K]2-K-beta A-OH), but not V3 monomer peptides, inhibit human immunodeficiency virus type 1 (HIV-1) infection and syncytium formation of CD4+ T cells from immortalized lines. Here, we show that MBPC1 attaches to normal peripheral blood lymphocytes (PBLS) and monocytes but not to erythrocytes. While treatment with 5 microM MBPC1 had no significant antiviral effect on HIV-1Ba-L infection of monocyte-derived macrophages as assessed by p24 production in culture supernatants, this dose inhibited both HIV-1Ba-L and HIV-1LAI infection of PBLs. Virus production was inhibited up to 90% when MBPC1 was added to PBLs immediately after the virus, and was inhibited about 50% when it was added after 3 days; no effect was noted when it was added 7 days postinfection. MBPC1 did not affect PBL growth or IL-2 receptor and CD4 surface expression level. These observations suggest a selective antiviral effect of MBPC1 on CD4+ T lymphocytes and they provide additional circumstantial evidence that HIV-1 enters lymphocytes and monocytes by different mechanisms.
authors.affiliation: Laboratoire de Biologie et Génétique des Déficits Immunitaires, CERVI, Hôpital de la Pitié-Salpétrière, Paris, France.
authors.forename: A
authors.initials: A
authors.lastname: Benjouad
authors.forename: N
authors.initials: N
authors.lastname: Seddiki
authors.forename: L
authors.initials: L
authors.lastname: Ylisastigui
authors.forename: J C
authors.initials: JC
authors.lastname: Gluckman
mesh_terms: D015704:CD4 Antigens / Q000378:metabolism; D015496:CD4-Positive T-Lymphocytes / Q000166:cytology / Q000378:metabolism / Q000821:virology*; D015699:HIV Envelope Protein gp120 / Q000378:metabolism / Q000494:pharmacology*; D015497:HIV-1 / Q000187:drug effects*; D006801:Humans; D066298:In Vitro Techniques; D008264:Macrophages / Q000166:cytology / Q000378:metabolism / Q000821:virology*; D008561:Membrane Fusion / Q000187:drug effects; D010446:Peptide Fragments / Q000378:metabolism / Q000494:pharmacology*; D011485:Protein Binding; D015375:Receptors, Interleukin-2 / Q000378:metabolism
chemical_list: D015704:CD4 Antigens; D015699:HIV Envelope Protein gp120; C059762:HIV envelope protein gp120 (305-321); D010446:Peptide Fragments; D015375:Receptors, Interleukin-2