In laboratory animals Calorie Restriction (CR) protects against aging, oxidative stress and neurodegenerative pathologies. Reduced levels of growth hormone and IGF-1, which mediate some of the protective effects of CR, can also extend longevity and protect against age-related diseases in rodents and humans. However, severely restricted diets are difficult to maintain and are associated with chronically low weight and other major side effects. Here, we show that four months of periodic protein restriction cycles (PRC) with supplementation of non-essential amino acids in mice already displaying significant cognitive impairment and AD-like pathology reduced circulating IGF-1 levels by 30-70% and caused an 8-fold increase in IGFBP-1. Whereas PRC did not affect the levels of β amyloid (Aβ) they decreased tau phosphorylation in the hippocampus and alleviated the age-dependent impairment in cognitive performance. These results indicate that periodic protein restriction cycles without CR can promote changes in circulating growth factors and tau phosphorylation associated with protection against age-related neuropathologies.
睪丸癌,雖然在年輕男性中并不常見,但它是該人群中最常見的實(shí)質(zhì)性惡性腫瘤。大...[詳細(xì)]
良性前列腺增生(BPH)是中老年男性中常見的泌尿系統(tǒng)問題,隨著年齡的增長(zhǎng),...[詳細(xì)]
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