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The Vitronectin Receptor Serves As an Accessory Molecule for the Activation of a Subset of Gamma/delta T Cells

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Journal J Exp Med
Date 1991 Jan 1
PMID 1702138
Citations 29
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Abstract

Constitutive production of cytokines was observed in 3 of 12 gamma/delta T cell lines derived from murine epidermis and correlated with the expression of the C gamma 4, V delta 6 T cell receptor (TCR). After adaptation of one of the lines (T195/BW) to serum-free culture conditions, cessation of the "spontaneous" production of interleukin 4 (IL-4) was observed and IL-4 production could then by induced by the addition of RGD-containing extracellular matrix (ECM) proteins to the culture. The response to the ECM proteins could be completely inhibited by a mAb to the murine vitronectin receptor (VNR). However, the induction of IL-4 production could also be inhibited by anti-CD3 and by an anti-clonotypic mAb to the TCR-gamma/delta of T195/BW. As TCR-gamma/delta loss mutants of T195/BW also failed to respond to ECM proteins, these data demonstrate that engagement of the VNR by its ligand is necessary, but not sufficient, for the induction of IL-4 production. Furthermore, the VNR is expressed by many other T cell clones (both gamma/delta and alpha/beta), none of which produce lymphokines constitutively. Taken together, these observations strongly favor the view that not only is coexpression of the VNR and TCR required for the induction of IL-4 production, but that the TCR must also be engaged by its ligand, most likely a cell surface antigen expressed by the hybridoma itself.

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