日韩操操操,日本精品一区,阿v视频观看免费国产最新,一级一片在线播放在线观看,欧美日韩一区二区中文字幕视频,日韩高清性爽一级毛片免费,欧美成人一区二区三区在线视频

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.