alpha-synuclein (alpha Syn) is a small neuronal protein whose accumulation correlates with Parkinson's disease. alpha Syn A53T mutant impairs mitochondrial functions by affecting substrate import within the organelle, activity of complex I and the maximal respiratory capacity. However, the precise mechanism initiating the bioenergetic dysfunction is not clearly understood yet. By overexpressing alpha Syn A53T in SH-SY5Y cells, we investigated the specific changes in the mitochondrial respiratory profile using High-Resolution Respirometry. We found that alpha Syn A53T increases dissipative fluxes across the intermembrane mitochondrial space: this does not compromise the oxygen flows devoted to ATP production while it reduces the bioenergetic excess capacity of mitochondria, providing a possible explanation of the increased cell susceptibility observed in the presence of further stress stimuli.

α-Synuclein A53T Promotes Mitochondrial Proton Gradient Dissipation and Depletion of the Organelle Respiratory Reserve in a Neuroblastoma Cell Line

Risiglione, Pierpaolo;Cubisino, Salvatore Antonio Maria;Lipari, Cristiana Lucia Rita;De Pinto, Vito;Messina, Angela
;
Magrì, Andrea
Ultimo
2022

Abstract

alpha-synuclein (alpha Syn) is a small neuronal protein whose accumulation correlates with Parkinson's disease. alpha Syn A53T mutant impairs mitochondrial functions by affecting substrate import within the organelle, activity of complex I and the maximal respiratory capacity. However, the precise mechanism initiating the bioenergetic dysfunction is not clearly understood yet. By overexpressing alpha Syn A53T in SH-SY5Y cells, we investigated the specific changes in the mitochondrial respiratory profile using High-Resolution Respirometry. We found that alpha Syn A53T increases dissipative fluxes across the intermembrane mitochondrial space: this does not compromise the oxygen flows devoted to ATP production while it reduces the bioenergetic excess capacity of mitochondria, providing a possible explanation of the increased cell susceptibility observed in the presence of further stress stimuli.
Parkinson’s disease
high-resolution respirometry
mitochondrial dysfunction
αSyn
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/540160
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