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pubmed-article:12482395pubmed:abstractTextBinding of HIV-1 glycoprotein (gp120) to activated B cells of HIV-infected and HIV-uninfected subjects induces increased cell proliferation, cAMP generation, immunoglobulin (Ig) production and downregulation of the invariant chain, CD79b, of the B-cell receptor. We present evidence that the stromal cell-derived factor-1alpha (SDF-1alpha), itself a B-cell stimulant, reversed gp120-driven downregulation of CD79b in CD40- and IL-4-activated purified HIV-1 seronegative human peripheral blood B cells. SDF-1alpha augmented gp120-induced Ig production, downregulated CXCR4 receptor expression, and alone, exerted no effect on CD79b surface expression, reversed the gp120-induced downregulation of CD79b. These SDF-1alpha-modulated B-cell responses were specifically abrogated by an anti-SDF-1alpha antibody. These data suggest that SDF-1alpha plays an important regulatory role in the altered B-cell responses seen in HIV-1 infection. Further, these findings may enhance the understanding of the pathophysiology of HIV-1 infection and suggest a strategy utilizing SDF-1alpha or related molecules as an anti-HIV therapy.lld:pubmed
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pubmed-article:12482395pubmed:articleTitleSDF-1alpha regulates HIV-1-gp120-induced changes in CD79b surface expression and Ig production in activated human B cells.lld:pubmed
pubmed-article:12482395pubmed:affiliationDepartment of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA. clnance@texaschildrenshospital.orglld:pubmed
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