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.
肱骨遠端骨折是四肢骨折中比較復雜、嚴重的類型,手術治療難度大,并發(fā)癥多。尺...[詳細]
小細胞肺癌,作為肺癌的一種常見類型,其治療策略通常以放化療和免疫治療為主。...[詳細]