The relationship between the ionized Ca concentration and mitochondrial functions
The aim of the study was to show the relationships between ionized Ca concentration ([Ca2+]m) in the mitochondria matrix and functional activity of this organelle. [Ca2+]m was determined using the fluorescent probe Fluo-4, AM. Total level of Ca2+ accumulation in mitochondria was monitored using 45Ca...
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National Academy of Sciences of Ukraine and Palladin Institute of Biochemistry of the National Academy of Sciences of Ukraine.
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doaj-8add5031a8ed482a86eef510a46eb27a2020-11-24T22:30:46ZengNational Academy of Sciences of Ukraine and Palladin Institute of Biochemistry of the National Academy of Sciences of Ukraine.Ukrainian Biochemical Journal2409-49432413-50032018-04-01903324010.15407/ubj90.03.032The relationship between the ionized Ca concentration and mitochondrial functionsL. G. Babich0S. G. Shlykov1A. M. Kushnarova-Vakal2N. I. Kupynyak3V. V. Manko4V. P. Fomin5S. O. Kosterin6Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, KyivPalladin Institute of Biochemistry, National Academy of Sciences of Ukraine, KyivPalladin Institute of Biochemistry, National Academy of Sciences of Ukraine, KyivIvan Franko National University of Lviv, UkraineIvan Franko National University of Lviv, UkraineUniversity of Delaware, Newark, USAPalladin Institute of Biochemistry, National Academy of Sciences of Ukraine, KyivThe aim of the study was to show the relationships between ionized Ca concentration ([Ca2+]m) in the mitochondria matrix and functional activity of this organelle. [Ca2+]m was determined using the fluorescent probe Fluo-4, AM. Total level of Ca2+ accumulation in mitochondria was monitored using 45Ca2+ as radioactive tracer. It was shown that incubation of myometrium mitochondria with 3 mM Mg2+ resulted in the low level of [Ca2+]m. Subsequent addition of 100 µM Ca2+ resulted in 8 times increase of [Ca2+]m but in low level of total calcium accumulation. Normalized fluorescence of Ca2+-sensitive probe Fluo-4 in response to the Ca2+ addition was higher than 2.5. At the same time, [Ca2+]m was considerably higher in the medium containing 3 mМ АТР and 3 mМ Mg2+. Subsequent addition of 100 µM Ca2+ to the incubation medium resulted in only 2.4 times increase of [Ca2+]m but considerably higher level of total calcium accumulation was observed. Normalized fluorescence of Fluo-4 in response to the Ca2+ addition was lower than 1.3. In liver mitochondria higher rate of oxygen consumption was detected in the presence of an oxidative substrate succinate than of pyruvate or α-ketoglutarate. At the presence of an oxidative substrate succinate normalized fluorescence of Fluo-4 in liver mitochondria in response to the Ca2+ addition was lower than 1.3. It was concluded that low level of [Ca2+]m was correlated with low functional activity of this organelle and, vise versa, high level of [Ca2+]m was correlated with high functional activity. It was suggested that normalized fluorescence changes in response to the Са2+ addition could be used as a test of the mitochondrial functional activity: lower normalized fluorescence values − higher functional activity.http://ukrbiochemjournal.org/wp-content/uploads/2018/04/Babich_3_18.pdfionized Са concentrationlivermitochondriamyometriumtotal Са(2+) accumulation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
L. G. Babich S. G. Shlykov A. M. Kushnarova-Vakal N. I. Kupynyak V. V. Manko V. P. Fomin S. O. Kosterin |
spellingShingle |
L. G. Babich S. G. Shlykov A. M. Kushnarova-Vakal N. I. Kupynyak V. V. Manko V. P. Fomin S. O. Kosterin The relationship between the ionized Ca concentration and mitochondrial functions Ukrainian Biochemical Journal ionized Са concentration liver mitochondria myometrium total Са(2+) accumulation |
author_facet |
L. G. Babich S. G. Shlykov A. M. Kushnarova-Vakal N. I. Kupynyak V. V. Manko V. P. Fomin S. O. Kosterin |
author_sort |
L. G. Babich |
title |
The relationship between the ionized Ca concentration and mitochondrial functions |
title_short |
The relationship between the ionized Ca concentration and mitochondrial functions |
title_full |
The relationship between the ionized Ca concentration and mitochondrial functions |
title_fullStr |
The relationship between the ionized Ca concentration and mitochondrial functions |
title_full_unstemmed |
The relationship between the ionized Ca concentration and mitochondrial functions |
title_sort |
relationship between the ionized ca concentration and mitochondrial functions |
publisher |
National Academy of Sciences of Ukraine and Palladin Institute of Biochemistry of the National Academy of Sciences of Ukraine. |
series |
Ukrainian Biochemical Journal |
issn |
2409-4943 2413-5003 |
publishDate |
2018-04-01 |
description |
The aim of the study was to show the relationships between ionized Ca concentration ([Ca2+]m) in the mitochondria matrix and functional activity of this organelle. [Ca2+]m was determined using the fluorescent probe Fluo-4, AM. Total level of Ca2+ accumulation in mitochondria was monitored using 45Ca2+ as radioactive tracer. It was shown that incubation of myometrium mitochondria with 3 mM Mg2+ resulted in the low level of [Ca2+]m. Subsequent addition of 100 µM Ca2+ resulted in 8 times increase of [Ca2+]m but in low level of total calcium accumulation. Normalized fluorescence of Ca2+-sensitive probe Fluo-4 in response to the Ca2+ addition was higher than 2.5. At the same time, [Ca2+]m was considerably higher in the medium containing 3 mМ АТР and 3 mМ Mg2+. Subsequent addition of 100 µM Ca2+ to the incubation medium resulted in only 2.4 times increase of [Ca2+]m but considerably higher level of total calcium accumulation was observed. Normalized fluorescence of Fluo-4 in response to the Ca2+ addition was lower than 1.3. In liver mitochondria higher rate of oxygen consumption was detected in the presence of an oxidative substrate succinate than of pyruvate or α-ketoglutarate. At the presence of an oxidative substrate succinate normalized fluorescence of Fluo-4 in liver mitochondria in response to the Ca2+ addition was lower than 1.3. It was concluded that low level of [Ca2+]m was correlated with low functional activity of this organelle and, vise versa, high level of [Ca2+]m was correlated with high functional activity. It was suggested that normalized fluorescence changes in response to the Са2+ addition could be used as a test of the mitochondrial functional activity: lower normalized fluorescence values − higher functional activity. |
topic |
ionized Са concentration liver mitochondria myometrium total Са(2+) accumulation |
url |
http://ukrbiochemjournal.org/wp-content/uploads/2018/04/Babich_3_18.pdf |
work_keys_str_mv |
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