Nuclear factor of activated T cells is a driving force for preferential productive HIV-1 infection of CD45RO-expressing CD4+ T cells - PubMed (original) (raw)
. 2002 Jun 28;277(26):23733-41.
doi: 10.1074/jbc.M201563200. Epub 2002 Apr 15.
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- PMID: 11956207
- DOI: 10.1074/jbc.M201563200
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Nuclear factor of activated T cells is a driving force for preferential productive HIV-1 infection of CD45RO-expressing CD4+ T cells
Gilles A Robichaud et al. J Biol Chem. 2002.
Free article
Abstract
Human immunodeficiency virus type-1 (HIV-1) preferentially replicates in CD4-expressing T cells bearing a "memory" (CD45RO+) rather than a "naive" (CD45RA+/CD62L+) phenotype. Yet the basis for the higher susceptibility of these cells to HIV-1 infection remains unclear. Because the nature of the CD45 isoform itself can affect biochemical events in T cells, we set out to determine whether these isoforms could differently modulate HIV-1 long terminal repeat (LTR) activity and thereby replication. Through the use of CD4+ Jurkat T cells specifically expressing distinct CD45 isoforms (i.e. CD45RABC or CD45RO), we demonstrated that a difference in CD45 isoform expression conferred preferential replication of HIV-1 to CD45RO-expressing T cell clones following a physiological CD3/CD28 stimulation. Closer analysis indicated that higher HIV-1 LTR activation levels were consistently observed in CD45RO-positive cells, which was paralleled by more pronounced nuclear factor of activated T cells (NFAT) activation in these same cells. Specific involvement of NFAT1 was revealed in studied Jurkat clones by mobility shift analyses. In addition, preferential activation of the LTR and viral replication in CD45RO T cells was FK506- and cyclosporin A-sensitive. These results underscore the importance of NFAT in HIV-1 regulation and for the first time identify the role of the CD45 isoform in limiting productive HIV-1 replication to the human CD4 memory T cell subset.
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