Aluminium induced oxidative stress results in decreased mitochondrial biogenesis via modulation of PGC-1α expression.
Toxicol Appl Pharmacol
; 273(2): 365-80, 2013 Dec 01.
Article
em En
| MEDLINE
| ID: mdl-24084166
ABSTRACT
The present investigation was carried out to elucidate a possible molecular mechanism related to the effects of aluminium-induced oxidative stress on various mitochondrial respiratory complex subunits with special emphasis on the role of Peroxisome proliferator activated receptor gamma co-activator 1α (PGC-1α) and its downstream targets i.e. Nuclear respiratory factor-1(NRF-1), Nuclear respiratory factor-2(NRF-2) and Mitochondrial transcription factor A (Tfam) in mitochondrial biogenesis. Aluminium lactate (10mg/kgb.wt./day) was administered intragastrically to rats for 12 weeks. After 12 weeks of exposure, we found an increase in ROS levels, mitochondrial DNA oxidation and decrease in citrate synthase activity in the Hippocampus (HC) and Corpus striatum (CS) regions of rat brain. On the other hand, there was a decrease in the mRNA levels of the mitochondrial encoded subunits-NADH dehydrogenase (ND) subunits i.e. ND1, ND2, ND3, Cytochrome b (Cytb), Cytochrome oxidase (COX) subunits i.e. COX1, COX3, ATP synthase (ATPase) subunit 6 along with reduced expression of nuclear encoded subunits COX4, COX5A, COX5B of Electron transport chain (ETC). Besides, a decrease in mitochondrial DNA copy number and mitochondrial content in both regions of rat brain was observed. The PGC-1α was down-regulated in aluminium treated rats along with NRF-1, NRF-2 and Tfam, which act downstream from PGC-1α in aluminium treated rats. Electron microscopy results revealed a significant increase in the mitochondrial swelling, loss of cristae, chromatin condensation and decreases in mitochondrial number in case of aluminium treated rats as compared to control. So, PGC-1α seems to be a potent target for aluminium neurotoxicity, which makes it an almost ideal target to control or limit the damage that has been associated with the defective mitochondrial function seen in neurodegenerative diseases.
Palavras-chave
ATP synthase; ATPase; Aluminium; COX; CS; Corpus striatum; Cyt b; Cytochrome b; Cytochrome oxidase; ETC; Electron transport chain; HC; Hippocampus; Mitochondrial biogenesis; Mitochondrial transcription factor A; NADH dehydrogenase; ND; NRF-1; NRF-2; Neurodegeneration; Nuclear respiratory factor-1; Nuclear respiratory factor-2; PGC-1α; Peroxisome proliferator activated receptor gamma co-activator 1a; ROS; Reactive oxygen species; Tfam
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fatores de Transcrição
/
Regulação da Expressão Gênica
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Estresse Oxidativo
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Alumínio
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Renovação Mitocondrial
Limite:
Animals
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article