Effects of metformin on human oral cancer KB cell proliferation and apoptosis in vitro / 南方医科大学学报
Journal of Southern Medical University
;
(12): 159-163, 2014.
Artigo
em Chinês
| WPRIM
| ID: wpr-356963
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the effects of metformin on the proliferation and apoptosis of human oral cancer cell line KB in vitro.</p><p><b>METHODS</b>Human oral cancer cell line KB was exposed to different doses of metformin (0, 1.25, 2.5, 5, 10, and 20 mmol/L), and the changes in cell viability were detected using MTT assay. Colony formation of the cells was observed following an 8-day metformin exposure. The changes in mitochondrial membrane potential were measured by JC-1 assay, and PI staining was used to observe the cell apoptosis. Western blotting was employed to detect the changes in the protein expressions of GRP78 and activated caspase-3.</p><p><b>RESULTS</b>Metformin exposure caused time- and dose-dependent suppression of KB cell proliferation, and exposure to 5 mmol/L metformin for 24, 48 and 72 h resulted in cell survival rates of 68.0%, 36.9%, and 14.5%, respectively. Metformin significantly inhibited KB cell colony formation. Exposure of the cells to increased concentrations of metformin gradually increased the apoptotic rate and decreased mitochondrial membrane potential. Metformin caused an initial up-regulation followed by a down-regulation of GRP78 expression in KB cells and increased the expression of activated caspase-3.</p><p><b>CONCLUSION</b>Metformin can inhibit the proliferation and induce apoptosis of KB cells, the mechanism of which may involve the activation of the mitochondrial apoptotic pathway and endoplasmic reticulum stress.</p>
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Farmacologia
/
Células KB
/
Apoptose
/
Proliferação de Células
/
Caspase 3
/
Potencial da Membrana Mitocondrial
/
Proteínas de Choque Térmico
/
Metabolismo
/
Metformina
Limite:
Humanos
Idioma:
Chinês
Revista:
Journal of Southern Medical University
Ano de publicação:
2014
Tipo de documento:
Artigo
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