Protección celular antioxidante y respuesta adaptativa inducida por estímulos oxidativos crónicos

ABSTRACT: Adaptation is an important mechanism in cells and organisms that allow them to respond to environmental challenges and changing functional demands. To accomplish these requirements, cells integrate modi cations at different levels such as gene expression, metabolic activity, cellular functionality and phenotype. The orderly coordination of these changes is fundamental for cells to maintain viability despite a variety of harmful stimuli, such as the case of exceedingly concentrations of reactive oxygen species (ROS). In this study, we tested the hypothesis that chronic and repetitive stimuli with a mild concentration of hydrogen peroxide (H2O2) would activate cellular responses, resulting in adaptation. This was done confronting cell cultures to prolonged exposures of H2O2 obtained with glucose oxydase (GlucOx) added to the medium to generate a constant concentration of the oxidant (≈ 50 μM); this treatment protocol (1h/d) was extended during seven continuous consecutive days after which the following parameters were evaluated: cell morphology and viability, mitochondrial DNA content, mitochondrial ROS accumulation and antioxidant defense gene expression. These data further support the idea that exposure to continuous and low concentrations of ROS, could act as signaling molecules inducing cellular processes that converged toward adaptation to chronic oxidative stress.

• Autores: Santa González, Gloria Angélica; Camargo Guerrero, Mauricio
• Tipo de recurso: Article of investigation
• Fecha de publicación: 2016
• Institución: Universidad de Antioquia
• Repositorio: Repositorio UdeA
• Idioma: spa
• OAI Identifier: oai:bibliotecadigital.udea.edu.co:10495/9637
• Acceso en línea: http://hdl.handle.net/10495/9637
• Palabra clave: Adaptación; Adaptation; Homeostasis; Defensa antioxidante; http://aims.fao.org/aos/agrovoc/c_117; http://aims.fao.org/aos/agrovoc/c_33930
• Rights: openAccess
• License: https://creativecommons.org/licenses/by-nc-sa/2.5/co/