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Dual functions of CNS inflammation in food intake and metabolic regulation.
Brain Research ( IF 2.7 ) Pub Date : 2020-04-27 , DOI: 10.1016/j.brainres.2020.146859
Tien-Jui Lee 1 , Sara L Hargrave 1 , Kimberly P Kinzig 1
Affiliation  

Western diet (WD) consumption induces chronic mild inflammation in the hypothalamus. However, metabolic consequences of increased hypothalamic inflammatory cytokines remain unclear. This research first aimed to examine whether increased proinflammatory cytokines in the brain influenced feeding or metabolism. Rats that received an intracerebroventricular third ventricle injection (i3vt) of 0.5 pg TNFα daily for six days consumed significantly more calories than saline-injected rats, with no differences between treatment groups in terms of body weight, blood triglycerides nor glucose regulation. Continuously infusing TNFα for three weeks decreased hepatic fatty acid synthase (FAS) and increased body weight and the epididymal adipose sterol regulatory element-binding protein 1c (SREBP-1c) gene expression. Differences were not due to food intake nor voluntary wheel running activity. The second aim of this research was to examine whether inhibition of inflammation signaling in the brain at early stage of switching from chow to WD would affect diet-induced obesity development. WD-fed rats with i3vt NFκB inhibitor had greater caloric intake than rats given i3vt saline. These studies suggest elevated inflammatory cytokines in the brain induce food intake acutely and favor fat storage and weight gain in the long term. However, in the early stage of WD consumption, hypothalamic inflammatory signaling inhibits caloric intake and may serve as a warning signal of energy imbalance.

中文翻译:

中枢神经系统炎症在食物摄入和代谢调节中的双重作用。

西方饮食 (WD) 消费会引起下丘脑的慢性轻度炎症。然而,下丘脑炎症细胞因子增加的代谢后果仍不清楚。这项研究首先旨在检查大脑中增加的促炎细胞因子是否影响进食或新陈代谢。连续六天每天接受 0.5 pg TNFα 的脑室内第三脑室注射 (i3vt) 的大鼠比注射盐水的大鼠消耗的卡路里显着更多,治疗组之间在体重、血液甘油三酯和葡萄糖调节方面没有差异。连续输注 TNFα 三周可降低肝脂肪酸合成酶 (FAS) 并增加体重和附睾脂肪甾醇调节元件结合蛋白 1c (SREBP-1c) 基因表达。差异不是由于食物摄入量或自愿轮跑活动。这项研究的第二个目的是检查在从食物转换为 WD 的早期阶段抑制大脑中的炎症信号是否会影响饮食诱导的肥胖发展。与给予 i3vt 盐水的大鼠相比,使用 i3vt NFκB 抑制剂的 WD 喂养大鼠具有更高的热量摄入。这些研究表明,大脑中升高的炎性细胞因子会急剧地诱导食物摄入,并有利于长期脂肪储存和体重增加。然而,在 WD 消耗的早期阶段,下丘脑炎症信号抑制热量摄入,并可能作为能量失衡的警告信号。这项研究的第二个目的是检查在从食物转换为 WD 的早期阶段抑制大脑中的炎症信号是否会影响饮食诱导的肥胖发展。与给予 i3vt 盐水的大鼠相比,使用 i3vt NFκB 抑制剂的 WD 喂养大鼠具有更高的热量摄入。这些研究表明,大脑中升高的炎性细胞因子会急剧地诱导食物摄入,并有利于长期脂肪储存和体重增加。然而,在 WD 消耗的早期阶段,下丘脑炎症信号抑制热量摄入,并可能作为能量失衡的警告信号。这项研究的第二个目的是检查在从食物转换为 WD 的早期阶段抑制大脑中的炎症信号是否会影响饮食诱导的肥胖发展。与给予 i3vt 盐水的大鼠相比,使用 i3vt NFκB 抑制剂的 WD 喂养大鼠具有更高的热量摄入。这些研究表明,大脑中升高的炎性细胞因子会急剧地诱导食物摄入,并有利于长期脂肪储存和体重增加。然而,在 WD 消耗的早期阶段,下丘脑炎症信号抑制热量摄入,并可能作为能量失衡的警告信号。这些研究表明,大脑中升高的炎性细胞因子会急剧地诱导食物摄入,并有利于长期脂肪储存和体重增加。然而,在 WD 消耗的早期阶段,下丘脑炎症信号抑制热量摄入,并可能作为能量失衡的警告信号。这些研究表明,大脑中升高的炎性细胞因子会急剧地诱导食物摄入,并有利于长期脂肪储存和体重增加。然而,在 WD 消耗的早期阶段,下丘脑炎症信号抑制热量摄入,并可能作为能量失衡的警告信号。
更新日期:2020-04-27
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