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. 1995 Nov;69(11):6904–6910. doi: 10.1128/jvi.69.11.6904-6910.1995

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.

M Benkirane 1, H Schmid-Antomarchi 1, D R Littman 1, M Hirn 1, B Rossi 1, C Devaux 1
PMCID: PMC189607  PMID: 7474107

Abstract

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.

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Selected References

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