Your browser doesn't support javascript.
loading
Accumulation of argpyrimidine, a methylglyoxal-derived advanced glycation end product, increases apoptosis of lens epithelial cells both in vitro and in vivo
Experimental & Molecular Medicine ; : 167-175, 2012.
Artículo en Inglés | WPRIM | ID: wpr-93413
ABSTRACT
The formation of advanced glycation end products (AGEs) has been considered to be a potential causative factor of injury to lens epithelial cells (LECs). Damage of LECs is believed to contribute to cataract formation. The purpose of this study was to investigate the cytotoxic effect of AGEs on LECs both in vitro and in vivo. We examined the accumulation of argpyrimidine, a methylglyoxal-derived AGE, and the expression of apoptosis-related molecules including nuclear factor-kappaB (NF-kappaB), Bax, and Bcl-2 in the human LEC line HLE-B3 and in cataractous lenses of Zucker diabetic fatty (ZDF) rats, an animal model of type 2 diabetes. In cataractous lenses from twenty-one-week-old ZDF rats, LEC apoptosis was markedly increased, and the accumulation of argpyrimidine as well as subsequent activation of NF-kappaB in LECs were significantly enhanced. The ratio of Bax to Bcl-2 protein levels was also increased. In addition, the accumulation of argpyrimidine triggered apoptosis in methylglyoxal-treated HLE-B3 cells. However, the presence of pyridoxamine (an AGEs inhibitor) and pyrrolidine dithiocarbamate (a NF-kappaB inhibitor) prevented apoptosis in HLE-B3 cells through the inhibition of argpyrimidine formation and the blockage of NF-kappaB nuclear translocalization, respectively. These results suggest that the cellular accumulation of argpyrimidine in LECs is NF-kappaB-dependent and pro-apoptotic.
Asunto(s)

Texto completo: Disponible Índice: WPRIM (Pacífico Occidental) Asunto principal: Ornitina / Pirimidinas / Piruvaldehído / Línea Celular / Apoptosis / Células Epiteliales / Cristalino Límite: Animales Idioma: Inglés Revista: Experimental & Molecular Medicine Año: 2012 Tipo del documento: Artículo

Similares

MEDLINE

...
LILACS

LIS

Texto completo: Disponible Índice: WPRIM (Pacífico Occidental) Asunto principal: Ornitina / Pirimidinas / Piruvaldehído / Línea Celular / Apoptosis / Células Epiteliales / Cristalino Límite: Animales Idioma: Inglés Revista: Experimental & Molecular Medicine Año: 2012 Tipo del documento: Artículo