A novel mechanism for coupling cellular intermediary metabolism to cytosolic Ca2+signaling via CD38/ADP‐ribosyl cyclase, a putative intracellular NAD+sensor
Open Access
- 14 January 2002
- journal article
- research article
- Published by Wiley in The FASEB Journal
- Vol. 16 (3), 302-314
- https://doi.org/10.1096/fj.01-0705com
Abstract
CD38 is an ectocyclase that converts NAD+ to the Ca2+-releasing second messenger cyclic ADP-ribose (cADPr). Here we report that in addition to CD38 ecto-catalysis, intracellularly expressed CD38 may catalyze NAD+→cADPr conversion to cause cytosolic Ca2+ release. High levels of CD38 were found in the plasma membranes, endoplasmic reticulum, and nuclear membranes of osteoblastic MC3T3-E1 cells. More important, intracellular CD38 was colocalized with target ryanodine receptors. The cyclase also converted a NAD+ surrogate, NGD+, to its fluorescent product, cGDPr (Km ~5.13 μM). NAD+ also triggered a cytosolic Ca2+ signal. Similar results were obtained with NIH3T3 cells, which overexpressed a CD38-EGFP fusion protein. The Δ-49-CD38-EGFP mutant with a deleted amino-terminal tail and transmembrane domain appeared mainly in the mitochondria with an expected loss of its membrane localization, but the NAD+-induced cytosolic Ca2+ signal was preserved. Likewise, Ca2+ release persisted in cells transfected with the Myr-Δ-49-CD38-EGFP or Δ-49-CD38-EGFP-Fan mutants, both directed to the plasma membrane but in an opposite topology to the full-length CD38-EGFP. Finally, ryanodine inhibited Ca2+ signaling, indicating the downstream activation of ryanodine receptors by cADPr. We conclude that intracellularly expressed CD38 might link cellular NAD+ production to cytosolic Ca2+ signaling.—Sun, L., Adebanjo, O. A., Koval, A., Anandatheerthavarada, H. K., Iqbal, J., Wu, X. Y., Moonga, B. S., Wu, X. B., Biswas, G., Bevis, P. J. R., Kumegawa, M., Epstein, S., Huang, C. L.-H., Avadhani, N. G., Abe, E., Zaidi, M. A novel mechanism for coupling cellular intermediary metabolism to cytosolic Ca2+ signaling via CD38/ADP-ribosyl cyclase, a putative intracellular NAD+ sensor. FASEB J. 16, 302–314 (2002)Keywords
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