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J Biol Chem, Vol. 274, Issue 9, 5995-6002, February 26, 1999

Skeletal Muscle Type Ryanodine Receptor Is Involved in Calcium Signaling in Human B Lymphocytes

Yoshitatsu SeiDagger , Kathleen L. GallagherDagger , and Anthony S. Basile

From the Dagger  Department of Anesthesiology, Uniformed Services University of the Health Sciences and the  Laboratory of Bioorganic Chemistry, NIDDK, National Institutes of Health, Bethesda, Maryland 20814-4799

The regulation of intracellular free Ca2+ concentration ([Ca2+]i) in B cells remains poorly understood and is presently explained almost solely by inositol 1,4,5-triphosphate (IP3)-mediated Ca2+ release, followed by activation of a store-operated channel mechanism. In fact, there are reports indicating that IP3 production does not always correlate with the magnitude of Ca2+ release. We demonstrate here that human B cells express a ryanodine receptor (RYR) that functions as a Ca2+ release channel during the B cell antigen receptor (BCR)-stimulated Ca2+ signaling process. Immunoblotting studies showed that both human primary CD19+ B and DAKIKI cells express a 565-kDa immunoreactive protein that is indistinguishable in molecular size and immunoreactivity from the RYR. Selective reverse transcription-polymerase chain reaction, restriction fragment length polymorphism, and sequencing of cloned cDNA indicated that the major isoform of the RYR expressed in primary CD19+ B and DAKIKI cells is identical to the skeletal muscle type (RYR1). Saturation analysis of [3H]ryanodine binding yielded Bmax = 150 fmol/mg of protein and Kd = 110 nM in DAKIKI cells. In fluo-3-loaded CD19+ B and DAKIKI cells, 4-chloro-m-cresol, a potent activator of Ca2+ release mediated by the ryanodine-sensitive Ca2+ release channel, induced Ca2+ release in a dose-dependent and ryanodine-sensitive fashion. Furthermore, BCR-mediated Ca2+ release in CD19+ B cells was significantly altered by 4-chloro-m-cresol and ryanodine. These results indicate that RYR1 functions as a Ca2+ release channel during BCR-stimulated Ca2+ signaling and suggest that complex Ca2+ signals that control the cellular activities of B cells may be generated by cooperation of the IP3 receptor and RYR1.

Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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