Cyclic ADP-ribose enhances coupling between voltage-gated Ca2+ entry and intracellular Ca2+ release - PubMed (original) (raw)
. 1997 Aug 22;272(34):20967-70.
doi: 10.1074/jbc.272.34.20967.
Affiliations
- PMID: 9261092
- DOI: 10.1074/jbc.272.34.20967
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Cyclic ADP-ribose enhances coupling between voltage-gated Ca2+ entry and intracellular Ca2+ release
R M Empson et al. J Biol Chem. 1997.
Free article
Abstract
Ca2+ release from intracellular stores can be activated in neurons by influx of Ca2+ through voltage-gated Ca2+ channels. This process, called Ca2+-induced Ca2+ release, relies on the properties of the ryanodine receptor and represents a mechanism by which Ca2+ influx during neuronal activity can be amplified into large intracellular Ca2+ signals. In a differentiated neuroblastoma cell line, we show that caffeine, a pharmacological activator of the ryanodine receptor, released Ca2+ from intracellular stores in a Ca2+-dependent and ryanodine-sensitive manner. The pyridine nucleotide, cyclic ADP-ribose, thought to be an endogenous modulator of ryanodine receptors also amplified Ca2+-induced Ca2+ release in these neurons. Cyclic ADP-ribose enhanced the total cytoplasmic Ca2+ levels during controlled Ca2+ influx through voltage gated channels, in a concentration-dependent and ryanodine-sensitive manner and also increased the sensitivity with which a small amount of Ca2+ influx could trigger additional release from the ryanodine-sensitive intracellular Ca2+ stores. Single cell imaging showed that following the Ca2+ influx, cyclic ADP-ribose enhanced the spatial spread of the Ca2+ signal from the edge of the cell into its center. These powerful actions suggest a role for cyclic ADP-ribose in the functional coupling of neuronal depolarization, Ca2+ entry, and global intracellular Ca2+ signaling.
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