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After opening, immediate PTP closure must follow to prevent outer membrane disruption, loss of cytochrome <jats:italic>c<\/jats:italic>, and eventual apoptosis. Flickering, defined as the rapid alternative opening\/closing of PTP, has been reported in heart, which undergoes frequent, large variations in Ca<jats:sup>2+<\/jats:sup>. In contrast, in tissues that undergo depolarization events less often, such as the liver, PTP would not need to be as dynamic and thus these tissues would not be as resistant to stress. To evaluate this idea, it was decided to follow the reversibility of the permeability transition (PT) in isolated murine mitochondria from two different tissues: the very dynamic heart, and the liver, which suffers depolarizations less frequently. It was observed that in heart mitochondria PT remained reversible for longer periods and at higher Ca<jats:sup>2+<\/jats:sup> loads than in liver mitochondria. In all cases, Ca<jats:sup>2+<\/jats:sup> uptake was inhibited by ruthenium red and PT was delayed by Cyclosporine A. Characterization of this phenomenon included measuring the rate of oxygen consumption, organelle swelling and Ca<jats:sup>2+<\/jats:sup> uptake and retention. Results strongly suggest that there are tissue\u2010specific differences in PTP physiology, as it resists many more Ca<jats:sup>2+<\/jats:sup> additions before opening in a highly active organ such as the heart than in an organ that seldom suffers Ca<jats:sup>2+<\/jats:sup> loading, such as the liver.<\/jats:p>","DOI":"10.14814\/phy2.16056","type":"journal-article","created":{"date-parts":[[2024,5,23]],"date-time":"2024-05-23T02:40:54Z","timestamp":1716432054000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Tissue\u2010specific differences in Ca<sup>2+<\/sup> sensitivity of the mitochondrial permeability transition pore (PTP). 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