The aetiology of Amyotrophic Lateral Sclerosis (ALS) is still poorly understood. The discovery of genetic forms of ALS pointed out the mechanisms underlying this pathology, but also showed how complex these mechanisms are. Excitotoxicity is strongly suspected to play a role in ALS pathogenesis. Excitotoxicity is defined as neuron damage due to excessive intake of calcium ions (Ca2+) by the cell. This study aims to find a relationship between the proteins coded by the most relevant genes associated with ALS and intracellular Ca2+ accumulation. In detail, the profile of eight proteins (TDP-43, C9orf72, p62/sequestosome-1, matrin-3, VCP, FUS, SOD1 and profilin-1), was analysed in three different cell types induced to raise their cytoplasmic amount of Ca2+. Intracellular Ca2+ accumulation causes a decrease in the levels of TDP-43, C9orf72, matrin3, VCP, FUS, SOD1 and profilin-1 and an increase in those of p62/sequestosome-1. These events are associated with the proteolytic action of two proteases, calpains and caspases, as well as with the activation of autophagy. Interestingly, Ca2+ appears to both favour and hinder autophagy. Understanding how and why calpain-mediated proteolysis and autophagy, which are physiological processes, become pathological may elucidate the mechanisms responsible for ALS and help discover new therapeutic targets.

Effects of intracellular calcium accumulation on proteins encoded by the major genes underlying amyotrophic lateral sclerosis

De Marco G.;Lomartire A.;Manera U.;Canosa A.;Grassano M.;Casale F.;Fuda G.;Salamone P.;Rinaudo M. T.;Colombatto S.;Moglia C.;Chio A.;Calvo A.
Last
2022-01-01

Abstract

The aetiology of Amyotrophic Lateral Sclerosis (ALS) is still poorly understood. The discovery of genetic forms of ALS pointed out the mechanisms underlying this pathology, but also showed how complex these mechanisms are. Excitotoxicity is strongly suspected to play a role in ALS pathogenesis. Excitotoxicity is defined as neuron damage due to excessive intake of calcium ions (Ca2+) by the cell. This study aims to find a relationship between the proteins coded by the most relevant genes associated with ALS and intracellular Ca2+ accumulation. In detail, the profile of eight proteins (TDP-43, C9orf72, p62/sequestosome-1, matrin-3, VCP, FUS, SOD1 and profilin-1), was analysed in three different cell types induced to raise their cytoplasmic amount of Ca2+. Intracellular Ca2+ accumulation causes a decrease in the levels of TDP-43, C9orf72, matrin3, VCP, FUS, SOD1 and profilin-1 and an increase in those of p62/sequestosome-1. These events are associated with the proteolytic action of two proteases, calpains and caspases, as well as with the activation of autophagy. Interestingly, Ca2+ appears to both favour and hinder autophagy. Understanding how and why calpain-mediated proteolysis and autophagy, which are physiological processes, become pathological may elucidate the mechanisms responsible for ALS and help discover new therapeutic targets.
2022
12
1
N/A
N/A
Amyotrophic Lateral Sclerosis; Autophagy; C9orf72 Protein; Calcium; Calpain; Caspases; DNA-Binding Proteins; Gene Expression Regulation; HeLa Cells; Humans; Nerve Tissue Proteins; Neurons; Nuclear Matrix-Associated Proteins; Profilins; Proteolysis; RNA-Binding Protein FUS; RNA-Binding Proteins; Sequestosome-1 Protein; Superoxide Dismutase-1; Time Factors; Transcriptome; Valosin Containing Protein; Calcium Signaling
De Marco G.; Lomartire A.; Manera U.; Canosa A.; Grassano M.; Casale F.; Fuda G.; Salamone P.; Rinaudo M.T.; Colombatto S.; Moglia C.; Chio A.; Calvo A.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1847559
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