The release of calcium from cardiac mitochondria: The importance of the calcium-protein ratio
- 1 January 1977
- journal article
- Published by Springer Nature in Basic Research in Cardiology
- Vol. 72 (1) , 77-81
- https://doi.org/10.1007/bf01906303
Abstract
Using a DW 2 dual wavelength spectrophotometer (AMINCO) and murexide as a Ca2+ sensitive indicator it is shown that guinea-pig heart mitochondria can release accumulated Ca2+ without the influence of non-physiological material. The main factor which decides if accumulated Ca2+ is spontaneously released is the Ca2+/mitochondrial-protein ratio. Under appropriate assay conditions a critical intramitochondrial Ca2+ concentration is reached. Increasing this concentration leads to Ca2+-release. Mit Hilfe eines Doppelwellenlängen-Photometers (DW-2, AMINCO) und von Murexid als Ca2+-Indikator konnte gezeigt werden, daß Meerschweinchen-Herz-mitochondrien auch ohne den Zusatz unphysiologischer Agenzien (wie Entkopplern oder Ruthenium Rot) gespeichertes Calcium spontan wieder freisetzen können. Entscheidend für diese spontane Ca2+-Freisetzung ist das Verhältnis von Calcium und Mitochondrienprotein. Unter bestimmten definierten Bedingungen stellt sich eine kritische intramitochondriale Ca2+-Konzentration ein; wird dieser Schwellenwert überschritten, tritt spontane Ca2+-Freisetzung ein.Keywords
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