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  • 1
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    ISSN: 1553-4006
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Medicine
    Notes: Loss of Ca2+ homeostasis, often in the form of cytoplasmic increases, leads to cell injury. Depending upon cell type and the intensity of Ca2+ toxicity, the ensuing pathology can be reversible or irreversible. Although multiple destructive processes are activated by Ca2+, lethal outcomes are determined largely by Ca2+-induced mitochondrial permeability transition. This form of damage is primarily dependent upon mitochondrial Ca2+ accumulation, which is regulated by the mitochondrial membrane potential. Retention of the mitochondrial membrane potential during Ca2+ increases favors mitochondrial Ca2+ uptake and overload, resulting in mitochondrial permeability transition and cell death. In contrast, dissipation of mitochondrial membrane potential reduces mitochondrial Ca2+ uptake, retards mitochondrial permeability transition, and delays death, even in cells with large Ca2+ increases. The rates of mitochondrial membrane potential dissipation and mitochondrial Ca2+ uptake may determine cellular sensitivity to Ca2+ toxicity under pathological conditions, including ischemic injury.
    Type of Medium: Electronic Resource
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