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. 1986 Nov 1;164(5):1760–1772. doi: 10.1084/jem.164.5.1760

Direct T helper-B cell interactions induce an early B cell activation antigen

PMCID: PMC2188453  PMID: 2945893

Abstract

We have explored the consequences for the B cell of cognate interaction with T cells. Early expression of the B cell-restricted cell surface activation antigen, BLAST-2, has been used as an assay system to measure direct T-B cell collaboration. BLAST-2 is preferentially expressed by allogenic B cells cultured with MHC class II antigen- restricted Th clone cells matched to the DR specificity of the target B cells. B cells cultured with DR-mismatched allospecific Th cells express minimal BLAST-2. Th cell-induced BLAST-2 expression appears to be accessory cell independent and occurs as early as 8 h after initiation of culture, with peak expression at 18 h. Direct T-B cell contact, rather than Th-derived lymphokines, provides the most efficient stimulus for BLAST-2 expression. Crosslinking of sIg on B cells is a poor stimulus for BLAST-2 expression. The BLAST-2 assay permits the evaluation of early events associated with B cell activation through cognate interactions, and may facilitate subsequent studies of the mechanism of B cell differentiation.

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Selected References

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