下丘脑的瘦素会导致大鼠最初过度食用美味的食物。

IF 3.1 2区 医学 Q1 ENDOCRINOLOGY & METABOLISM
Emily E Noble, Ruth B S Harris
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引用次数: 0

摘要

从表达VMH sf1的神经元中删除瘦素受体会加重小鼠饮食诱导的肥胖。本文描述的实验测试了VMH瘦素受体是否能预防大鼠肥胖。当提供45%卡路里的脂肪HF饮食时,雄性(而不是雌性)Sprague Dawley大鼠的能量摄入量增加了3天。在60天的高频喂养期间,男女的身体成分没有变化。基础瘦素信号在暴饮暴食过程中没有改变,但当用高频饲料喂养的大鼠纠正能量摄入时,后脑瘦素活性下调。雄性和雌性大鼠仅在给予HF饮食的早期对VMH瘦素的敏感性增加。用瘦素皂苷(leptin-saporin, Lep-Sap)删除表达VMH瘦素受体的细胞,阻止了雄性小鼠最初的贪食,但与喂食10%卡路里脂肪饮食的大鼠相比,没有改变随后的能量摄入、消耗、肥胖或葡萄糖清除率。令人惊讶的是,hf喂养的Lep-Sap大鼠对外周注射瘦素有反应,而lf喂养的Lep-Sap大鼠没有反应。雄性Lep-Sap大鼠对2%蔗糖溶液的偏好增加,但在补偿10%蔗糖溶液的消耗方面比空白sap大鼠更准确。同样,Lep-Sap大鼠提供猪油、30%蔗糖和松茸的选择饮食,增加了能量摄入和体脂量,但在饮食的前4天,由于减少了松茸摄入量,消耗的脂肪量少于空白大鼠。这些结果表明,大鼠的VMH瘦素受体有助于早期过度食用美味饮食,当NTS和VMH中的瘦素信号下调时,这种情况就会逆转。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Leptin in the VMH contributes to the initial overconsumption of palatable diets by rats.

Deleting leptin receptors from VMH steroidogenic factor 1-expressing neurons exaggerates diet-induced obesity in mice. Experiments described here tested whether VMH leptin receptors prevent obesity in rats. Male, but not female, Sprague-Dawley rats increased energy intake for 3 days when offered a 45% kcal fat high-fat (HF) diet. There was no change in body composition of either sex during 60 days of HF feeding. Basal leptin signaling was not changed during overeating, but hindbrain leptin activity was downregulated when HF-fed rats corrected energy intake. Male and female rats exhibited increased sensitivity to VMH leptin only during the early days of being offered an HF diet. Deletion of VMH leptin receptor-expressing cells using leptin-saporin (Lep-Sap) prevented the initial hyperphagia in males but did not change subsequent energy intake, expenditure, adiposity, or glucose clearance compared with rats fed a 10% kcal fat diet. Surprisingly, HF-fed Lep-Sap rats responded to peripheral injection of leptin, whereas LF-fed Lep-Sap rats did not. Male Lep-Sap rats showed increased preference for a 2% sucrose solution but were more accurate than control blank-Sap rats in compensating for consumption of a 10% sucrose solution. Similarly, Lep-Sap rats offered a choice diet of lard, 30% sucrose, and chow increased energy intake and body fat mass but consumed less than blank-Sap rats during the first 4 days on the diet by decreasing chow intake. These results suggest that VMH leptin receptors in rats contribute to the early overconsumption of palatable diets and that this is reversed when leptin signaling in the nucleus tractus solitarius and VMH is downregulated.NEW & NOTEWORTHY When rats are offered a high-fat diet, they overeat for the first few days, and then energy intake decreases to a lower, stable level. Experiments described here demonstrate that leptin receptors in the ventromedial hypothalamus of rats are required for this overeating. Loss of these receptors appears to result in an increased preference for sucrose solution but a greater precision of the control of energy intake.

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来源期刊
CiteScore
9.80
自引率
0.00%
发文量
98
审稿时长
1 months
期刊介绍: The American Journal of Physiology-Endocrinology and Metabolism publishes original, mechanistic studies on the physiology of endocrine and metabolic systems. Physiological, cellular, and molecular studies in whole animals or humans will be considered. Specific themes include, but are not limited to, mechanisms of hormone and growth factor action; hormonal and nutritional regulation of metabolism, inflammation, microbiome and energy balance; integrative organ cross talk; paracrine and autocrine control of endocrine cells; function and activation of hormone receptors; endocrine or metabolic control of channels, transporters, and membrane function; temporal analysis of hormone secretion and metabolism; and mathematical/kinetic modeling of metabolism. Novel molecular, immunological, or biophysical studies of hormone action are also welcome.
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