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1.
Korean Journal of Ophthalmology ; : 123-131, 2012.
Article in English | WPRIM | ID: wpr-40419

ABSTRACT

PURPOSE: To investigate the effect of advanced glycation end products (AGE) on oxidative stress and cellular senescence in cultured human trabecular meshwork cells (HTMC). METHODS: Primarily cultured HTMC were exposed to 0, 10, 50, 100, 200 microg/mL of glycated bovine serum albumin (G-BSA) for 5 days. Also co-exposed were L-arginine, sepiapterin, and antioxidant N-acetylcysteine (NAC). Cellular survival and production of nitric oxide (NO), superoxide, and reactive oxygen species were assessed by 3-[4, 5-dimethylthiazol-2-yl]-2, 5-diphenyltetrazolium bromide assay, Griess assay, cytochrome c assay, and dichlorofluorescin diacetate assay, respectively. Senescence-associated beta-galactosidase staining was performed to quantify the degree of cellular senescence. RESULTS: G-BSA decreased cellular survival, NO production, and increased superoxide production significantly in a dose-dependent manner. The effects of G-BSA were abolished with co-exposure of L-arginine, sepiapterin, and NAC. G-BSA enhanced cellular senescence accompanied by increased production of reactive oxygen species. G-BSA-induced cellular senescence was suppressed by application of L-arginine, sepiapterin, and NAC. CONCLUSIONS: AGE enhances cellular senescence of HTMC accompanied with increased oxidative stress. AGE-induced oxidative stress and cellular senescence could be delayed by application of anti-oxidants.


Subject(s)
Humans , Acetylcysteine/metabolism , Apoptosis/drug effects , Arginine/metabolism , Cellular Senescence/drug effects , Cell Survival/drug effects , Cells, Cultured , /metabolism , Nitric Oxide/metabolism , Oxidative Stress/physiology , Pterins/metabolism , Reactive Oxygen Species/metabolism , Serum Albumin, Bovine/metabolism , Trabecular Meshwork/drug effects
2.
Rev. chil. anat ; 13(1): 87-92, 1995. ilus
Article in Spanish | LILACS | ID: lil-174988

ABSTRACT

El presente estudio pretende analizar microscópicamente los defectos inducidos por el etanol cuando la exposición ocurre durante los primeros estadios de desarrollo en el pollo. En este estudio se emplearon huevos fecundados de gallina (White Leghorn). Los huevos fueron tratados con etanol en el día 0 (29, 40 y 60 por ciento) mediante instilación en la cámara de aire. El grupo control fue instilado con 0,1 ml de NaCI al 0,9 por ciento. Los huevos se incubaron a 37,8 ºC. Los embriones fueron extraídos, desde los huevos, después de 11 días de incubación y examinados con lupa esteroscópica. Las muestras obtenidas fueron fijadas en formol al 10 por ciento , fotografiadas y procesadas de acuerdo a las técnicas histológicas corrientes y por el método de picrosirius. El análisis microscópico por medio del método de picrosirius, reveló que el proceso de osificación membranosa presenta un menor desarrollo, además, una menor cantidad de colágeno tipo I en el hueso trabecular en los embriones postexposición a etanol con respecto al control


Subject(s)
Animals , Chick Embryo , Chick Embryo/metabolism , Ethanol/pharmacology , Fetal Development/drug effects , Abnormalities, Drug-Induced , Cerebrum/abnormalities , Cerebrum/embryology , Cerebrum/metabolism , Collagen/deficiency , Control Groups , Chick Embryo , Instillation, Drug , Microscopy , Trabecular Meshwork/abnormalities , Trabecular Meshwork/drug effects
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