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M9620396.TXT
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1996-02-26
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Document 0396
DOCN M9620396
TI The cytoplasmic tail of CD4 is required for inhibition of human
immunodeficiency virus type 1 replication by antibodies that bind to the
immunoglobulin CDR3-like region in domain 1 of CD4.
DT 9602
AU Benkirane M; Schmid-Antomarchi H; Littman DR; Hirn M; Rossi B; Devaux C;
Laboratoire d'Immunologie des Infections Retrovirales, Centre; National
de la Recherche Scientifique UPR9008, Institute de; Biologie,
Montpellier, France.
SO J Virol. 1995 Nov;69(11):6904-10. Unique Identifier : AIDSLINE
MED/96013790
AB Monoclonal antibodies (MAb) directed against the immunoglobulin
complementary determining region 3 (CDR3)-like region of the CD4
molecule inhibit human immunodeficiency virus type 1 (HIV-1)
transcription. We report here data showing that the cytoplasmic tail of
CD4 is required for such inhibition to be achieved. To this aim, we
studied the effect of MAb 13B8-2 treatment on (i) HIV-1 production in
A2.01 cells, which express different forms of the CD4 gene, (ii)
Tat-induced HIV-1 promoter activation, and (iii) mitogen-activated
protein kinase (MAPK) activation, which is induced in CD4-positive cells
by HIV-1 cross-linking of CD4. Inhibition of HIV production by 13B8-2
MAb treatment was consistently observed in cells expressing wild-type
CD4 and cells expressing a hybrid CD4-CD8 molecule (amino acids 1 to 177
of CD4 fused to the hinge, transmembrane, and cytoplasmic domains of
CD8). However, no delay in HIV-1 production was observed in cells
expressing a truncated CD4 which lacks the cytoplasmic domain (CD4.401).
Chloramphenicol acetyltransferase assays demonstrated that Tat-dependent
activation of the HIV-1 long terminal repeat promoter was inhibited by
MAb 13B8-2 in A2.01/CD4 and A2.01/CD4-CD8 but not in A2.01/CD4.401
cells. Finally, we found that MAb 13B8-2 treatment inhibited the
activation of MAPK induced in A2.01/CD4 and A2.01/CD4-CD8 following
cross-linking of CD4 by HIV-1.
DE Antibodies, Monoclonal/*PHARMACOLOGY Antigens,
CD/BIOSYNTHESIS/*PHYSIOLOGY Antigens, CD4/BIOSYNTHESIS/*PHYSIOLOGY
Binding Sites, Antibody Calmodulin-Dependent Protein Kinases/METABOLISM
Cell Line Chloramphenicol Acetyltransferase/BIOSYNTHESIS Clone Cells
Comparative Study Flow Cytometry Human HIV-1/IMMUNOLOGY/*PHYSIOLOGY
Kinetics Receptor-CD3 Complex, Antigen, T-Cell/*PHYSIOLOGY Recombinant
Proteins/BIOSYNTHESIS Support, Non-U.S. Gov't T-Lymphocytes
Transfection *Virus Replication JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).