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Published online 17 November 2003. doi:10.1083/jcb.200307016
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© The Rockefeller University Press, 0021-9525/2003/11/837 $8.00
The Journal of Cell Biology, Volume 163, Number 4, 837-845


Article

Spatio-temporal propagation of Ca2+ signals by cyclic ADP-ribose in 3T3 cells stimulated via purinergic P2Y receptors

Santina Bruzzone1,2, Svenja Kunerth3, Elena Zocchi1,2, Antonio De Flora1,2 and Andreas H. Guse3

1 Department of Experimental Medicine, Section of Biochemistry
2 Center of Excellence for Biomedical Research, University of Genova, 16132 Genova, Italy
3 University Hospital Hamburg-Eppendorf, Centre for Experimental Medicine, Institute of Biochemistry and Molecular Biology I: Cellular Signal Transduction, 20246 Hamburg, Germany

Address correspondence to Andreas Guse, University Hospital Hamburg-Eppendorf, Centre for Experimental Medicine, Institute of Biochemistry and Molecular Biology I: Cellular Signal Transduction, Martinistr. 52, 20246 Hamburg, Germany. Tel.: 49-40-42803-2828. Fax: 49-40-42803-9880. email: guse{at}uke.uni-hamburg.de

The role of cyclic ADP-ribose in the amplification of subcellular and global Ca2+ signaling upon stimulation of P2Y purinergic receptors was studied in 3T3 fibroblasts. Either (1) 3T3 fibroblasts (CD38- cells), (2) 3T3 fibroblasts preloaded by incubation with extracellular cyclic ADP-ribose (cADPR), (3) 3T3 fibroblasts microinjected with ryanodine, or (4) 3T3 fibroblasts transfected to express the ADP-ribosyl cyclase CD38 (CD38+ cells) were used. Both preincubation with cADPR and CD38 expression resulted in comparable intracellular amounts of cyclic ADP-ribose (42.3 ± 5.2 and 50.5 ± 8.0 pmol/mg protein). P2Y receptor stimulation of CD38- cells yielded a small increase of intracellular Ca2+ concentration and a much higher Ca2+ signal in CD38-transfected cells, in cADPR-preloaded cells, or in cells microinjected with ryanodine. Confocal Ca2+ imaging revealed that stimulation of ryanodine receptors by cADPR or ryanodine amplified localized pacemaker Ca2+ signals with properties resembling Ca2+ quarks and triggered the propagation of such localized signals from the plasma membrane toward the internal environment, thereby initiating a global Ca2+ wave.

Key Words: cyclic ADP-ribose; Ca2+ signaling; 3T3 cell; CD38; signal transduction


S. Bruzzone and S. Kunerth contributed equally to this work.

Abbreviations used in this paper: cADPR, cyclic ADP-ribose; IP3, D-myo-inositol 1,4,5-trisphosphate; IP3R, IP3 receptor; ROI, region of interest; RyR, ryanodine receptor.


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