Mitochondria: the missing link between preconditioning and neuroprotection.
The quote "what does not kill you makes you stronger" perfectly describes the preconditioning phenomenon - a paradigm that affords robust brain tolerance in the face of neurodegenerative insults. Over the last few decades, many attempts have been made to identify the molecular mechanisms involved in preconditioning-induced protective responses, and recent data suggests that many of these mechanisms converge on the mitochondria, positing mitochondria as master regulators of preconditioning-triggered endogenous neuroprotection. In this review, we critically discuss evidence for the involvement of mitochondria within the preconditioning paradigm. We will highlight the crucial targets and mediators by which mitochondria are integrated into neuroprotective signaling pathways that underlie preconditioning, putting focus on mitochondrial respiratory chain and mitochondrial reactive oxygen species, mitochondrial ATP-sensitive potassium channels, mitochondrial permeability transition pore, uncoupling proteins, and mitochondrial antioxidant enzyme manganese superoxide dismutase. We also discuss the role of mitochondria in the induction of hypoxia-inducible factor-1, a transcription factor engaged in preconditioning-mediated neuroprotective effects. The identification of intrinsic mitochondrial mechanisms involved in preconditioning will provide new insights which can be translated into potential pharmacological interventions aimed at counteracting neurodegeneration.
Correia
Sónia C
SC
Center for Neuroscience and Cell Biology of Coimbra, University of Coimbra, Coimbra, Portugal.
Santos
Renato X
RX
Perry
George
G
Zhu
Xiongwei
X
Moreira
Paula I
PI
Smith
Mark A
MA
D000818:Animals; D001927:Brain Diseases / Q000473:pathology* / Q000517:prevention & control*; D045222:Electron Transport Chain Complex Proteins / Q000378:metabolism; D006801:Humans; D051793:Hypoxia-Inducible Factor 1 / Q000378:metabolism; D019194:Ischemic Preconditioning / Q000379:methods*; D008928:Mitochondria / Q000502:physiology*; D017382:Reactive Oxygen Species / Q000378:metabolism
D045222:Electron Transport Chain Complex Proteins; D051793:Hypoxia-Inducible Factor 1; D017382:Reactive Oxygen Species
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