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Abstract:

Mitochondria are dynamic organelles that undergo fusion and fission processes. These events are regulated by mitochondria-shaping proteins. Changes in the expression and/or localization of these proteins lead to a mitochondrial dynamics impairment and may promote apoptosis. Increasing evidence correlates the mitochondrial dynamics disruption with the occurrence of neurodegenerative diseases. Therefore, we focused on this topic in Manganese (Mn)-induced Parkinsonism, a disorder associated with Mn accumulation preferentially in the basal ganglia where mitochondria from astrocytes represent an early target. Using MitoTracker Red staining we observed increased mitochondrial network fission in Mn-exposed rat astrocytoma C6 cells. Moreover, Mn induced a marked decrease in fusion protein Opa-1 levels as well as a dramatic increase in the expression of fission protein Drp-1. Additionally, Mn provoked a significant release of high MW Opa-1 isoforms from the mitochondria to the cytosol as well as an increased Drp-1 translocation to the mitochondria. Both Mdivi-1, a pharmacological Drp-1 inhibitor, and rat Drp-1 siRNA reduced the number of apoptotic nuclei, preserved the mitochondrial network integrity and prevented cell death. CsA, an MPTP opening inhibitor, prevented mitochondrial Δψm disruption, Opa-1 processing and Drp-1 translocation to the mitochondria therefore protecting Mn-exposed cells from mitochondrial disruption and apoptosis. The histological analysis and Hoechst 33258 staining of brain sections of Mn-injected rats in the striatum showed a decrease in cellular mass paralleled with an increase in the occurrence of apoptotic nuclei. Opa-1 and Drp-1 expression levels were also changed by Mn-treatment. Our results demonstrate for the first time that abnormal mitochondrial dynamics is implicated in both in vitro and in vivo Mn toxicity. In addition we show that the imbalance in fusion/fission equilibrium might be involved in Mn-induced apoptosis. This knowledge may provide new therapeutic tools for the treatment of Manganism and other neurodegenerative diseases. © 2014 Alaimo et al.

Registro:

Documento: Artículo
Título:Deregulation of mitochondria-shaping proteins Opa-1 and Drp-1 in manganese-induced apoptosis
Autor:Alaimo, A.; Gorojod, R.M.; Beauquis, J.; Muñoz, M.J.; Saravia, F.; Kotler, M.L.
Filiación:Laboratorio de Apoptosis en el Sistema Nervioso Y Nano-Oncología, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Departamento de Química Biológica, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Departamento de Fisiología, Biología Molecular Y Celular, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Palabras clave:manganese; mitochondrial protein; protein Drp 1; protein Opa 1; small interfering RNA; unclassified drug; animal cell; animal experiment; animal model; animal tissue; apoptosis; article; astrocyte; basal ganglion; bioaccumulation; brain region; cell disruption; cellular distribution; controlled study; cytosol; cytotoxicity; disorders of mitochondrial functions; male; molecular dynamics; nonhuman; parkinsonism; protein analysis; protein expression; protein function; protein localization; protein transport; rat; toxicity testing; upregulation; Animals; Apoptosis; Cell Line, Tumor; Cyclosporine; Dynamins; Gene Expression Regulation; GTP Phosphohydrolases; Intracellular Space; Male; Manganese; Membrane Potential, Mitochondrial; Mitochondria; Neostriatum; Protein Transport; Rats; Rats, Sprague-Dawley
Año:2014
Volumen:9
Número:3
DOI: http://dx.doi.org/10.1371/journal.pone.0091848
Título revista:PLoS ONE
Título revista abreviado:PLoS ONE
ISSN:19326203
CODEN:POLNC
CAS:manganese, 16397-91-4, 7439-96-5
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19326203_v9_n3_p_Alaimo

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Citas:

---------- APA ----------
Alaimo, A., Gorojod, R.M., Beauquis, J., Muñoz, M.J., Saravia, F. & Kotler, M.L. (2014) . Deregulation of mitochondria-shaping proteins Opa-1 and Drp-1 in manganese-induced apoptosis. PLoS ONE, 9(3).
http://dx.doi.org/10.1371/journal.pone.0091848
---------- CHICAGO ----------
Alaimo, A., Gorojod, R.M., Beauquis, J., Muñoz, M.J., Saravia, F., Kotler, M.L. "Deregulation of mitochondria-shaping proteins Opa-1 and Drp-1 in manganese-induced apoptosis" . PLoS ONE 9, no. 3 (2014).
http://dx.doi.org/10.1371/journal.pone.0091848
---------- MLA ----------
Alaimo, A., Gorojod, R.M., Beauquis, J., Muñoz, M.J., Saravia, F., Kotler, M.L. "Deregulation of mitochondria-shaping proteins Opa-1 and Drp-1 in manganese-induced apoptosis" . PLoS ONE, vol. 9, no. 3, 2014.
http://dx.doi.org/10.1371/journal.pone.0091848
---------- VANCOUVER ----------
Alaimo, A., Gorojod, R.M., Beauquis, J., Muñoz, M.J., Saravia, F., Kotler, M.L. Deregulation of mitochondria-shaping proteins Opa-1 and Drp-1 in manganese-induced apoptosis. PLoS ONE. 2014;9(3).
http://dx.doi.org/10.1371/journal.pone.0091848