Proteção por L-carnitina ou piracetam contra a morte celular causada por sinvastatina em celulas tumorais e não tumorais / Protection by L-carnitine or piracetam against cell death caused by simvastatin in tumor and non tumorigenic cell lines

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

Statins are drugs widely used in the treatment of hypercholesterolemia. They are competitive inhibitors of 3-hydroxy 3-methylglutaryl coenzyme A (HMG-CoA) reductase preventing in this way, the synthesis of cholesterol. L-carnitine is synthesized from the essential aminoacids lysine and methionine in liver and kidney and plays na important role in the cell, where it is involved in fatty acid oxidation by acting as a cofactor in the transport of acyl groups across the inner mitochondrial membrane. Piracetam is a nootropic drug which function is to improve cognitive performance, and the functions involved in the processes of learning, memory, attention and consciousness. This study aimed to evaluate the protective action of L-carnitine or piracetam against necrosis in PC-3 cells induced by 60 µM simvastatin or 500 µM tertbutyl- hydroperoxide (t-BOOH). Both simvastatin and t-BOOH causes mitochondrial permeability transition (MPT) followed by necrosis. L-carnitine and piracetam protected against cell death induced by simvastatin or t-BOOH by a dose-dependent mechanism (1-12 µM). In the assessment of mitochondrial dysfunction caused by simvastatin or t- BOOH, L-carnitine or piracetam similarly to cyclosporin A protected against the loss of mitochondrial membrane potential. The decrease in state III or state IV respiration rates, were also prevented. When non-tumor cell lines (GN16-P6 and HaCaT) were analyzed, it was observed that both L-carnitine and piracetam also protected against cell death induced by simvastatin. We can conclude that these compounds protected against cell necrosis by inhibiting MPT in both tumor or non tumor cell lines.

ASSUNTO(S)

mitocondria estresse oxidativo morte celular carnitina sinvastatina mitochondria oxidative stress cell death carnitine sinvastatin

ACESSO AO ARTIGO

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