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. 1993 Feb;78(2):210–217.

Ligation of the CD5 or CD28 molecules on resting human T cells induces expression of the early activation antigen CD69 by a calcium- and tyrosine kinase-dependent mechanism.

P Vandenberghe 1, J Verwilghen 1, F Van Vaeck 1, J L Ceuppens 1
PMCID: PMC1421815  PMID: 7682535

Abstract

The CD5 and CD28 molecules on T lymphocytes can each exert an accessory role in T-cell activation. Ligands for CD5 and CD28 have been identified as CD72 and B7/BB1 respectively. The function of, and the signal transduction pathways coupled to CD28 have been the subject of extensive studies. In contrast, it is still debated whether CD5 functions as a receptor which directly transduces an independent signal to the T cell. In this paper, it is reported that culture of purified T cells in the presence of either immobilized anti-CD5 monoclonal antibody (mAb) (OKT1, Leu-1 or 10.2) or cross-linked anti-CD28 (9.3) mAb (but not of anti-LFA-1 alpha, anti-LFA-1 beta, or anti-CD7) induces expression of CD69, an early activation marker, in the absence of other activating stimuli. CD69 expression was consistently detectable after 3-24 hr on 20-50% of T cells, within both the CD4 and CD8 subsets. CD45RO- CD45RA+ naive T cells were more responsive than CD45RO+ CD45RA- memory T cells. In the presence of recombinant (r) interleukin-2 (IL-2), anti-CD5- or anti-CD28- induced CD69 expression was further up-regulated, more sustained and, as previously shown, succeeded by IL-2 responsiveness. Simultaneous cross-linking of both CD5 and CD28 enhanced CD69 expression above the levels obtained with optimal amounts of both ligands separately. In the presence of a submitogenic dose of the protein kinase C (PKC) activating agent phorbol 12-myristate 13-acetate (PMA), co-stimulation with anti-CD5 or anti-CD28 increased CD69 expression above that induced by PMA alone. Cross-linking of CD5 or CD28 induces an early rise of cytoplasmic free calcium concentration ([Ca2+)]i) and both this rise and CD69 expression were inhibited by chelation of extracellular Ca2+ with ethyleneglycol-bis-(2-aminoethyl)-tetraacetate (EGTA). Pretreatment of the cells with the tyrosine kinase inhibitor herbimycin A also blocked CD69 expression. The data thus antigen-independent fashion. Moreover it is demonstrated that influx of Ca2+ and tyrosine kinase activity are involved in the signal transduction pathways of both receptors.

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Selected References

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