Direct mobilisation of lysosomal Ca2+ triggers complex Ca2+ signals.

Direct mobilisation of lysosomal Ca2+ triggers complex Ca2+ signals.
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DOI:
10.1242/jcs.118836
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发表时间:
2013-01-01
影响因子:
4
通讯作者:
Patel S
Patel S
中科院分区:
生物学2区
文献类型:
--
作者:
Kilpatrick BS;Eden ER;Schapira AH;Futter CE;Patel S

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Accumulating evidence implicates acidic organelles of the endolysosomal system as mobilisable stores of Ca2+ but their relationship to the better-characterised endoplasmic reticulum (ER) Ca2+ store remains unclear. Here we show that rapid osmotic permeabilisation of lysosomes evokes prolonged, spatiotemporally complex Ca2+ signals in primary cultured human fibroblasts. These Ca2+ signals comprised an initial response that correlated with lysosomal disruption and secondary long-lasting spatially heterogeneous Ca2+ oscillations that required ER-localised inositol trisphosphate receptors. Electron microscopy identified extensive membrane contact sites between lysosomes and the ER. Mobilisation of lysosomal Ca2+ stores is thus sufficient to evoke ER-dependent Ca2+ release probably through lysosome-ER membrane contact sites, and akin to the proposed mechanism of action of the Ca2+ mobilising messenger nicotinic acid adenine dinucleotide phosphate (NAADP). Our data identify functional and physical association of discrete Ca2+ stores important for the genesis of Ca2+ signal complexity.
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