Journal
CELL CALCIUM
Volume 47, Issue 6, Pages 480-490Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceca.2010.05.001
Keywords
NAADP; Calcium; Endosome; Lysosome; Calcium stores; Two-pore channels
Categories
Funding
- Biotechnology and Biological Sciences Research Council [BB/G013721/1]
- Research in to Ageing and the Alzheimer's Research Trust
- National Institutes of Health [GM088790, HL090804]
- Biotechnology and Biological Sciences Research Council [BB/G013721/1] Funding Source: researchfish
- BBSRC [BB/G013721/1] Funding Source: UKRI
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NAADP is a potent regulator of cytosolic calcium levels. Much evidence suggests that NAADP activates a novel channel located on an acidic (lysosomal-like) calcium store, the mobilisation of which results in further calcium release from the endoplasmic reticulum. Here, we discuss the recent identification of a family of poorly characterized ion channels (the two-pore channels) as endo-lysosomal NAADP receptors. The generation of calcium signals by these channels is likened to those evoked by depolarisation during excitation-contraction coupling in muscle. We discuss the idea that two-pore channels can mediate a trigger release of calcium which is then amplified by calcium-induced calcium release from the endoplasmic reticulum. This is similar to the activation of voltage-sensitive calcium channels and subsequent mobilisation of sarcoplasmic reticulum calcium stores in cardiac tissue. We suggest that two-pore channels may physically interact with ryanodine receptors to account for more direct release of calcium from the endoplasmic reticulum in analogy with the conformational coupling of voltage-sensitive calcium channels and ryanodine receptors in skeletal muscle. Interaction of two-pore channels with other calcium release channels likely occurs between stores trans-chatter and possibly within the same store cis-chatter. We also speculate that trafficking of two-pore channels through the endo-lysosomal system facilitates interactions with calcium entry channels. Strategic placing of two-pore channels thus provides a versatile means of generating spatiotemporally complex cellular calcium signals. (C) 2010 Elsevier Ltd. All rights reserved.
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