CD38: a new paradigm in lymphocyte activation and signal transduction

Immunological Reviews
Frances E LundM Howard

Abstract

CD38 is a type II transmembrane glycoprotein that is extensively expressed on cells of hematopoietic and non-hematopoietic lineage. Although the intracellular domain of CD38 is not homologous to any known proteins, the extracellular domain of CD38 is structurally related to enzymes in the ADP-ribosyl cyclase family. The structural homology between CD38 and the cyclase family members extends to functional homology, as the extracellular domain of CD38 can mediate the catalysis of beta-NAD+ into nicotinamide, ADP-ribose (ADPR) and, to a lesser extent, into cyclic ADPR-ribose (cADPR). Extensive investigation in other systems has shown that cADPR is an important regulator of intracellular Ca2+ release. Since engagement of CD38 on hematopoietic cells with anti-CD38 Abs has been shown to have potent effects on a number of in vitro cellular responses, we have speculated that cADPR might control CD38-mediated signal transduction. However, it has been difficult to understand how a mediator which is typically an intracellular signaling molecule could potentiate its effects from an extracellular location, thus posing a dilemma which pertains to all ecto-enzymes and the mechanisms by which they regulate signal transduction and cellular proc...Continue Reading

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