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M9490418.TXT
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1994-09-19
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Document 0418
DOCN M9490418
TI Multibranched V3 peptides inhibit human immunodeficiency virus infection
in human lymphocytes and macrophages.
DT 9411
AU Yahi N; Fantini J; Mabrouk K; Tamalet C; de Micco P; van Rietschoten J;
Rochat H; Sabatier JM; CNRS URA 1455, Laboratoire de Biochimie,
Ingenierie de; Proteines, Faculte de Medecine Secteur Nord, Marseille,;
France.
SO J Virol. 1994 Sep;68(9):5714-20. Unique Identifier : AIDSLINE
MED/94335086
AB Synthetic polymeric constructions (SPCs) including the consensus
sequence of the human immunodeficiency virus type 1 (HIV-1) surface
envelope glycoprotein gp120 V3 loop (GPGRAF) blocked the fusion between
HIV-1- and HIV-2-infected cells and CD4+ uninfected cells. A
structure-activity relationship study using V3 SPC analogs showed that
the most efficient inhibitor of cell fusion was an eight-branched SPC
with the hexapeptide motif GPGRAF (i.e., [GPGRAF]8-SPC). N-terminal
acetylation or incorporation of D-amino acids in the GPGRAF sequence of
this SPC resulted in significant loss of activity. Analogs with fewer
than six residues in the motif (i.e., GPGRA or GPGR), as well as SPCs
with a nonrelevant sequence, did not inhibit cell fusion, demonstrating
the high specificity of the antifusion activity. [GPGRAF]8-SPC, which
was not toxic to CEM cells at concentrations of up to 50 microM,
inhibited 50% of HIV-1(LAI) replication in these cells at a
concentration of 0.07 microM. Moreover, [GPGRAF]8-SPC inhibited the
infection of human peripheral blood mononuclear cells by several HIV-1
and HIV-2 isolates, including laboratory strains [HIV-1(LAI),
HIV-1(NDK), and HIV-2(ROD)], and fresh primary isolates, including two
zidovudine-resistant HIV-1 isolates and two HIV-2 isolates obtained from
infected individuals. The multibranched peptide also inhibited infection
of human primary macrophages by the highly cytopathic macrophage-tropic
isolate HIV-1(89.6). The antiviral activity of [GPGRAF]8-SPC was not
related to a virucidal effect, since preincubation of HIV-1 with the
peptide did not affect its infectious titer. This result is in agreement
with the concept that the multibranched peptide mimics a part of the V3
loop and thus interacts with the host cell. The therapeutic properties
of synthetic multibranched peptides based on the V3 loop consensus motif
should be evaluated in HIV-infected patients.
DE Amino Acid Sequence Cell Fusion/DRUG EFFECTS Human HIV Envelope
Protein gp120/CHEMISTRY HIV Infections/*MICROBIOLOGY HIV-2/GROWTH &
DEVELOPMENT In Vitro Leukocytes, Mononuclear/MICROBIOLOGY
Macrophages/MICROBIOLOGY Molecular Sequence Data Peptides/CHEMISTRY
Support, Non-U.S. Gov't JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).