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• W2108705019 endingPage "127" @default.
• W2108705019 startingPage "114" @default.
• W2108705019 abstract "Mitochondrial Ca(2+) sequestration is a well-known process that is involved in various physiological and pathological mechanisms. Using isolated suspended mitochondria one unique mitochondrial Ca(2+) uniporter was considered to account ubiquitously for the transfer of Ca(2+) into these organelles. However, by applying alternative techniques for measuring mitochondrial Ca(2+) uptake evidences for molecularly distinct mitochondrial Ca(2+) carriers accumulated recently. Herein we compared different methodical approaches of studying mitochondrial Ca(2+) uptake. Patch clamp technique on mitoplasts from endothelial and HeLa cells revealed the existence of three and two mitoplast Ca(2+) currents (I(CaMito)), respectively. According to their conductance, these channels were named small (s-), intermediate (i-), large (l-) and extra-large (xl-) mitoplast Ca(2+) currents (MCC). i-MCC was found in mitoplasts of both cell types whereas s-MCC and l-MCC or xl-MCC were/was exclusively found in mitoplasts from endothelial cells or HeLa cells. The comparison of mitochondrial Ca(2+) signals, measured either indirectly by sensing extra-mitochondrial Ca(2+) or directly by recording changes of the matrix Ca(2+), showed different Ca(2+) sensitivities of the distinct mitochondrial Ca(2+) uptake routes. Subpopulations of mitochondria with different Ca(2+) uptake capacities in intact endothelial cells could be identified using Rhod-2/AM. In contrast, cells expressing mitochondrial targeted pericam or cameleon (4mtD3cpv) showed homogeneous mitochondrial Ca(2+) signals in response to cell stimulation. The comparison of different experimental approaches and protocols using isolated organelles, permeabilized and intact cells, pointed to cell-type specific and versatile pathways for mitochondrial Ca(2+) uptake. Moreover, this work highlights the necessity of the utilization of multiple technical approaches to study the complexity of mitochondrial Ca(2+) homeostasis." @default.
• W2108705019 created "2016-06-24" @default.
• W2108705019 creator A5038445110 @default.
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• W2108705019 creator A5075648989 @default.
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• W2108705019 date "2012-04-01" @default.
• W2108705019 modified "2023-09-23" @default.
• W2108705019 title "Studying mitochondrial Ca2+ uptake – A revisit" @default.
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• W2108705019 doi "https://doi.org/10.1016/j.mce.2011.10.033" @default.
• W2108705019 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3334272" @default.
• W2108705019 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22100614" @default.
• W2108705019 hasPublicationYear "2012" @default.
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