Abstract
As the number of elderly individuals is increasing in modern society, the need for a relevant gerontology model is higher than ever before. Aging can be defined by specific cellular hallmarks, described by López-Otín and colleagues, who provided a map which can be used to scavenge the aging tissue environment. As revealing the presence of individual hallmarks does not necessarily indicate aging, here we provide different (immuno)histochemical approaches that can be used to investigate several aging hallmarks-namely, genomic damage, mitochondrial dysfunction/oxidative stress, cellular senescence, stem cell exhaustion, and altered intercellular communication-in the killifish retina, optic tectum, and/or telencephalon at a morphological level. In combination with molecular and biochemical analysis of these aging hallmarks, this protocol offers the opportunity to fully characterize the aged killifish central nervous system.
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