Blood-hypothalamus barrier and metabolic impairment in advanced aging

项目摘要/摘要 世界人口正在老龄化。尽管我们在延长寿命方面取得了进步，但仍有巨大的 与年龄相关的发病率和死亡率的个体性。人们认识到， 海马区血脑屏障(BBB)是认知功能障碍的早期事件 衰老。然而，衰老是如何影响下丘脑的血脑屏障及其代谢的 人们还不能很好地理解后果。这项研究的目的是检验与年龄有关的 伸展细胞数量的减少是下丘脑血脑屏障减弱的原因之一。 对代谢损伤和死亡率的影响。我们将确定细胞的增殖能力 张力细胞随着年龄的增长而减少，导致与年龄相关的张力细胞的丧失。我们将探索是否 松弛细胞增殖不足导致下丘脑内侧基底和下丘脑BBB减弱 它的后果。我们将评估血脑屏障外AgRP神经元的老化是否标志着 老年晚期AgRP神经元功能下降和代谢脱轨。寿命是 受遗传和环境因素的影响。鉴于农业专家小组的基本作用 代谢控制中的神经元及其在血脑屏障外的独特解剖定位， 从这项研究中获得的信息将确定下丘脑BBB在 晚期衰老中的代谢控制和寿命。

Project Summary/Abstract The world population is aging. Despite our advances in extending lifespan, there is tremendous individuality in age-related morbidity and mortality. It is recognized that the breakdown of the blood-brain barrier (BBB) in hippocampus marks an early event of cognitive impairment in aging. However, how aging affects BBB in the hypothalamus, and its ensuring metabolic consequences is not well understood. The goal of this study is to test whether the age-related decline of tanycyte number contributes to the weakening of the BBB in the hypothalamus and its impact on metabolic impairment and mortality. We will determine if proliferative capacity of tanycytes decreases with age, leading to age-dependent loss of tanycytes. We will explore if inadequate tanycyte proliferation leads to weakened BBB in the mediobasal hypothalamus and its consequences. We will evaluate if aging of the AgRP neurons outside the BBB marks the decline of AgRP neuronal function and metabolic derailment in advanced aging. Lifespan is influenced by both genetic and environmental factors. Given the essential roles of the AgRP neurons in metabolic control and their unique anatomical localization outside the BBB, information obtained from this study will establish the importance of the hypothalamic BBB in metabolic control and longevity in advanced aging.