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• W2034862605 abstract "While a pathway for Ca2+ accumulation into mitochondria has long been established, its functional significance is only now becoming clear in relation to cell physiology and pathophysiology. The observation that mitochondria take up Ca2+ during physiological Ca2+ signalling in a variety of cell types leads to four questions: (i) 'What is the impact of mitochondrial Ca2+ uptake on mitochondrial function?' (ii) 'What is the impact of mitochondrial Ca2+ uptake on Ca2+ signalling?' (iii) 'What are the consequences of impaired mitochondrial Ca2+ uptake for cell function?' and finally (iv) 'What are the consequences of pathological [Ca2+]c signalling for mitochondrial function?' These will be addressed in turn. Thus: (i) accumulation of Ca2+ into mitochondria regulates mitochondrial metabolism and causes a transient depolarisation of mitochondrial membrane potential. (ii) Mitochondria may act as a spatial Ca2+ buffer in many cells, regulating the local Ca2+ concentration in cellular microdomains. This process regulates processes dependent on local cytoplasmic Ca2+ concentration ([Ca2+]c), particularly the flux of Ca2+ through IP3-gated channels of the endoplasmic reticulum (ER) and the channels mediating capacitative Ca2+ influx through the plasma membrane. Consequently, mitochondrial Ca2+ uptake plays a substantial role in shaping [Ca2+]c signals in many cell types. (iii) Impaired mitochondrial Ca2+ uptake alters the spatiotemporal characteristics of cellular [Ca2+]c signalling and downregulates mitochondrial metabolism. (iv) Under pathological conditions of cellular [Ca2+]c overload, particularly in association with oxidative stress, mitochondrial Ca2+ uptake may trigger pathological states that lead to cell death. In the model of glutamate excitotoxicity, microdomains of [Ca2+]c are apparently central, as the pathway to cell death seems to require the local activation of neuronal nitric oxide synthase (nNOS), itself held by scaffolding proteins in close association with the NMDA receptor. Mitochondrial Ca2+ uptake in combination with NO production triggers the collapse of mitochondrial membrane potential, culminating in delayed cell death." @default.
• W2034862605 created "2016-06-24" @default.
• W2034862605 creator A5018410798 @default.
• W2034862605 date "2000-11-01" @default.
• W2034862605 modified "2023-10-14" @default.
• W2034862605 title "Mitochondria and calcium: from cell signalling to cell death" @default.
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• W2034862605 doi "https://doi.org/10.1111/j.1469-7793.2000.00057.x" @default.
• W2034862605 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2270168" @default.
• W2034862605 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11080251" @default.
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