Transient loss of satiety effects of leptin in middle-aged male mice

IF 3.3 4区 医学 Q2 ENDOCRINOLOGY & METABOLISM
Zin Khant Aung, Sharon R. Ladyman, Rosemary S. E. Brown
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Abstract

Extensive research is undertaken in rodents to determine the mechanism underlying obesity-induced leptin resistance. While body weight is generally tightly controlled in these studies, the effect of age of experimental animals has received less attention. Specifically, there has been little investigation into leptin regulation of food intake in middle-aged animals, which is a period of particular relevance for weight gain in humans. We investigated whether the satiety effects of leptin remained constant in young (3 months), middle-aged (12 months) or aged (18–22 months) male mice. Although mean body weight increased with age, leptin concentrations did not significantly increase in male mice beyond 12 months of age. Exogenous leptin administration led to a significant reduction in food intake in young mice but had no effect on food intake in middle-aged male mice. This loss of the satiety effect of leptin appeared to be transient, with leptin administration leading to the greatest inhibition of food intake in the aged male mice. Subsequently, we investigated whether these differences were due to changes in leptin transport into the brain with ageing. No change in leptin clearance from the blood or transport into the brain was observed, suggesting the emergence of central resistance to leptin in middle age. These studies demonstrate the presence of dynamic and age-specific changes in the satiety effects of leptin in male mice and highlight the requirement for age to be carefully considered when undertaking metabolic studies in rodents.

Abstract Image

Abstract Image

中年雄性小鼠一过性失去瘦素的饱腹效应。
人们在啮齿类动物身上开展了大量研究,以确定肥胖诱发瘦素抵抗的机制。在这些研究中,体重通常受到严格控制,但实验动物年龄的影响却较少受到关注。具体来说,对于中年动物的瘦素对食物摄入量的调节研究很少,而这一时期与人类体重增加特别相关。我们研究了瘦素对幼年(3 个月)、中年(12 个月)或老年(18-22 个月)雄性小鼠的饱腹效应是否保持不变。虽然雄性小鼠的平均体重会随着年龄的增长而增加,但瘦素浓度在 12 个月后并没有显著增加。外源性瘦素可显著减少幼鼠的食物摄入量,但对中年雄性小鼠的食物摄入量没有影响。瘦素饱腹效应的消失似乎是短暂的,老年雄性小鼠摄入瘦素对食物摄入量的抑制作用最大。随后,我们研究了这些差异是否是由于随着年龄的增长,瘦素在大脑中的转运发生了变化。我们没有观察到瘦素从血液中清除或转运到大脑的变化,这表明中年时期出现了对瘦素的中枢抵抗。这些研究表明,在雄性小鼠体内,瘦素的饱腹感效应存在动态变化,且随年龄而变化,并强调在对啮齿类动物进行新陈代谢研究时,必须仔细考虑年龄因素。
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来源期刊
Journal of Neuroendocrinology
Journal of Neuroendocrinology 医学-内分泌学与代谢
CiteScore
6.40
自引率
6.20%
发文量
137
审稿时长
4-8 weeks
期刊介绍: Journal of Neuroendocrinology provides the principal international focus for the newest ideas in classical neuroendocrinology and its expanding interface with the regulation of behavioural, cognitive, developmental, degenerative and metabolic processes. Through the rapid publication of original manuscripts and provocative review articles, it provides essential reading for basic scientists and clinicians researching in this rapidly expanding field. In determining content, the primary considerations are excellence, relevance and novelty. While Journal of Neuroendocrinology reflects the broad scientific and clinical interests of the BSN membership, the editorial team, led by Professor Julian Mercer, ensures that the journal’s ethos, authorship, content and purpose are those expected of a leading international publication.
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