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Mitochondrial dysfunction induced by frataxin deficiency is associated with cellular senescence and abnormal calcium metabolism

AutorBolinches-Amorós, Arantxa ; Mollá, Belén ; Pla-Martín, David ; Palau Martínez, Francesc ; González-Cabo, Pilar
Palabras claveFriedreich ataxia
Mitochondrial dysfunction
Cellular senescence
Calcium metabolism
Fecha de publicación13-may-2014
EditorFrontiers Media
CitaciónFrontiers in Cellular Neuroscience; 8:124 (2014)
ResumenFriedreich ataxia is considered a neurodegenerative disorder involving both the peripheral and central nervous systems. Dorsal root ganglia (DRG) are the major target tissue structures. This neuropathy is caused by mutations in the FXN gene that encodes frataxin. Here, we investigated the mitochondrial and cell consequences of frataxin depletion in a cellular model based on frataxin silencing in SH-SY5Y human neuroblastoma cells, a cell line that has been used widely as in vitro models for studies on neurological diseases. We showed that the reduction of frataxin induced mitochondrial dysfunction due to a bioenergetic deficit and abnormal Ca2+ homeostasis in the mitochondria that were associated with oxidative and endoplasmic reticulum stresses. The depletion of frataxin did not cause cell death but increased autophagy, which may have a cytoprotective effect against cellular insults such as oxidative stress. Frataxin silencing provoked slow cell growth associated with cellular senescence, as demonstrated by increased SA-βgal activity and cell cycle arrest at the G1 phase. We postulate that cellular senescence might be related to a hypoplastic defect in the DRG during neurodevelopment, as suggested by necropsy studies.
Descripción15 páginas, 10 figuras.
Versión del editorhttp://dx.doi.org/10.3389/fncel.2014.00124
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