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. 1998 Mar;93(3):376–382. doi: 10.1046/j.1365-2567.1998.00447.x

The transmembrane region of CD2-associated signal-transducing proteins is crucial for the outcome of CD2-mediated T-cell activation.

A Von Bonin 1, S Ehrlich 1, B Fleischer 1
PMCID: PMC1364086  PMID: 9640248

Abstract

Signalling through the CD2 molecule was shown previously to employ similar signalling molecules as the T-cell receptor (TCR). Here, we show that CD2-mediated signalling is strongly influenced by the expressed transmembrane region of the employed signal-transducing molecule. We used TCR-negative cells expressing chimeric fusion proteins that consist of human interleukin-2 (IL-2) receptor alpha-chain-derived sequences (hCD25) fused to mouse-specific zeta-chain segments (hCD25-zeta). One set of TCR-negative cell lines expressed the hCD25-derived extracellular part fused to mouse-specific transmembrane and cytoplasmic zeta-protein sequences ('TZZ'). The second type of cell lines expressed the hCD25-derived extracellular and transmembrane portions fused to the mouse-specific zeta-chain cytoplasmic segment ('TTZ'). After cross-linking the hCD25-zeta molecules with specific monoclonal antibodies (mAb), all TCR-negative cell lines produced similar amounts of IL-2. Cross-linking with stimulating pairs of CD2-specific mAb, however, led to IL-2 production only in cell lines expressing the zeta-chain-specific transmembrane segment. Co-cross-linking of CD25 and CD2 molecules resulted in an effective stimulation of both TZZ- and TTZ-expressing cell lines. Moreover, TTZ- and TZZ-expressing cell lines differed in their pattern of tyrosine-phosphorylated proteins after stimulation with hCD25-specific mAb. Thus, although CD2 and TCR molecules share signalling components and pathways, the fine tuning of CD2 co-receptor function appears to be regulated in part by transmembrane regions of signal-transducing molecules like the TCR-associated zeta-chain.

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Selected References

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