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. 1997 Apr;90(4):564–571. doi: 10.1046/j.1365-2567.1997.00196.x

Differential G-protein expression during B- and T-cell development.

K R Grant 1, W Harnett 1, G Milligan 1, M M Harnett 1
PMCID: PMC1456694  PMID: 9176110

Abstract

The molecular mechanisms underlying B- and T-cell development are, as yet, poorly understood. However, as G proteins regulate a diverse range of biological responses including growth, proliferation and differentiation, we have investigated differential expression of G proteins during B- and T-cell development with the aim of identifying key signals involved in lymphocyte maturation. Differential expression of beta 1/2 and alpha-subunits of the Gs-, i- and q-families was found throughout lymphoid development. Most strikingly, G alpha i1 and G alpha i1 were very weakly, or not expressed in pre-, immature and mature B cells, thymocytes or mature T cells, but strongly induced in mature B-lymphoblastoid cell lines, some of which have been used as models of germinal centre B cells, suggesting that expression of these G proteins may correlate with the later stages of B-cell development. In contrast, G alpha 16 expression was highest in T cells and pre-B cells and progressively declined with B-cell maturation. These findings suggest that G proteins, and the signals they regulate, such as ion channels and/or adenylate cyclase (G alpha s/i) and phospholipase C (G beta gamma and G alpha 11/16) are differentially regulated in lymphoid cells in a maturation-and lineage-dependent manner.

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Selected References

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