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Previous studies reported that the polycomb group gene Bmi-1 is downregulated in the aging brain. The aim of this study was to investigate whether decreased Bmi-1 expression accelerates brain aging by analyzing the brain phenotype of adult Bmi-1 heterozygous knockout (Bmi-1+/−) mice. An 8-month-old Bmi-1+/− brains demonstrated mild oxidative stress, revealed by significant increases in hydroxy radical...
Currently, the oxidative stress (or free radical) theory of aging is the most popular explanation of how aging occurs at the molecular level. Accordingly, a stress-induced senescence-like phenotype of human dermal fibroblasts can be induced in vitro by the exposure of human diploid fibroblasts to subcytotoxic concentrations of hydrogen peroxide. However, several biomarkers of replicative senescence...
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