alexa Calcium, ATP, and ROS: a mitochondrial love-hate triangle
Pathology

Pathology

Journal of Clinical & Experimental Pathology

Author(s): Brookes PS, Yoon Y, Robotham JL, Anders MW, Sheu SS

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The mitochondrion is at the core of cellular energy metabolism, being the site of most ATP generation. Calcium is a key regulator of mitochondrial function and acts at several levels within the organelle to stimulate ATP synthesis. However, the dysregulation of mitochondrial Ca(2+) homeostasis is now recognized to play a key role in several pathologies. For example, mitochondrial matrix Ca(2+) overload can lead to enhanced generation of reactive oxygen species, triggering of the permeability transition pore, and cytochrome c release, leading to apoptosis. Despite progress regarding the independent roles of both Ca(2+) and mitochondrial dysfunction in disease, the molecular mechanisms by which Ca(2+) can elicit mitochondrial dysfunction remain elusive. This review highlights the delicate balance between the positive and negative effects of Ca(2+) and the signaling events that perturb this balance. Overall, a "two-hit" hypothesis is developed, in which Ca(2+) plus another pathological stimulus can bring about mitochondrial dysfunction

This article was published in Am J Physiol Cell Physiol. and referenced in Journal of Clinical & Experimental Pathology

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