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Aging influences multiple incidices of oxidative stress in the aortic media of the Fischer 344/NNia × Brown Norway/BiNia rat

Here, we determine the influence of aging on multiple markers of oxidative stress in the aorta of adult (6-month), aged (30-month) and very aged (36-month) Fischer 344/NNiaHSd × Brown Norway/BiNia (F344/N × BN) rats. Compared to adults, increases in as determined by oxidation of hydroethidine (HE) to ethidium (Et) were increased 79.7 ± 7.0% in 36-month aortae and this finding was highly correlated with increases in medal thickness (r = 0.773, p < 0.01) and total protein nitration (r = 0.706, p < 0.01) but not Ki67, a marker for cell proliferation. Regression analysis showed that increases in aortic superoxide anion () with aging were significantly correlated with changes in the expression and/or regulation of proteins involved in metabolic (AMPK-α), signaling (mitogen activated protein kinases (MAPKs) along with c-Src), apoptotic (Bax, Bcl-2, Traf-2) and transcriptional (NF-κB) activities. These results suggest that the aging F344/N × BN aorta may be highly suited for unraveling the molecular events that lead to age-associated alterations in aortic oxidative stress.