Hypothalamic-pituitary-adrenal axis plasticity across life-history stages of a free-living subtropical finch, Amandava amandava amandava.

IF 3.3 4区 医学 Q2 ENDOCRINOLOGY & METABOLISM
Banalata Mohanty
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Abstract

The alterations of phenotypic traits (morphology, endocrine physiology, and behavior) in response to predictable environmental cues across life-history stages in seasonally breeding birds enable successful culmination of reproduction. The present study elucidated the plasticity of the hypothalamic-pituitary-adrenal (HPA) axis in a subtropical free-living finch, Amandava amandava amandava, and suggests the crucial role of the baseline corticosterone (CORT) to coordinate energetic readiness across life-history stages. Birds were captured monthly from an area (25.1337° N 82.5644° E) in Uttar Pradesh, India, from June 2014 to May 2015. Only male birds were included in this study corresponding to different life-history stages (6/life-history stage; 2/month): pre-breeding (June-August), breeding (September-November), post-breeding (December-February), and quiescent phases (March-May). The pituitary expression of adrenocorticotropic hormone (ACTH), adrenal interrenal cell morphometry, and plasma level of the CORT showed varied patterns across life-history stages. The density and immunointensity of the ACTH-immunoreactive corticotropes and the interrenal cell number increased along with the significant plasma CORT elevation during the breeding cycle (both pre-breeding and breeding phases). CORT might facilitate the energy demand for the display of sexual behavior (nest-building, courtship), testicular recrudescence, and foraging of food for offspring during the breeding cycle. On the contrary, plasma CORT decrease in the post-breeding and quiescent phases might enable the bird to molt avoiding the protein catabolic effect of the hormone. Given the complexity involved in the study of baseline CORT in free-living birds, more studies are needed to better understand the crucial role of the HPA axis in the modulation of life-history stages in this and other subtropical avian species.

自由生活的亚热带雀科鸟类 Amandava amandava 的下丘脑-垂体-肾上腺轴在不同生活史阶段的可塑性。
在季节性繁殖的鸟类中,表型特征(形态、内分泌生理和行为)的改变是对各生命史阶段可预测的环境线索的反应,从而使繁殖成功达到高潮。本研究阐明了一种亚热带自由生活雀类(Amandava amandava amandava)的下丘脑-垂体-肾上腺(HPA)轴的可塑性,并提出了基线皮质酮(CORT)在协调各生活史阶段的能量准备方面的关键作用。2014年6月至2015年5月期间,每月从印度北方邦的一个地区(北纬25.1337°,东经82.5644°)捕获鸟类。只有雄性鸟类被纳入本研究,它们分别处于不同的生命史阶段(6只/生命史阶段;2只/月):繁殖前(6月-8月)、繁殖期(9月-11月)、繁殖后(12月-2月)和静止期(3月-5月)。垂体促肾上腺皮质激素(ACTH)的表达、肾上腺间质细胞形态学和血浆 CORT 水平在不同生活史阶段表现出不同的模式。在繁殖周期(包括繁殖前和繁殖期),促肾上腺皮质激素免疫反应性肾上腺皮质细胞的密度和免疫点密度以及肾间质细胞数量增加,血浆 CORT 也显著升高。CORT可能有助于繁殖周期中的性行为(筑巢、求偶)、睾丸再萌发和为后代觅食所需的能量需求。相反,鸟类在繁殖后和静止期血浆 CORT 的减少可能会使鸟类在蜕皮时避免激素的蛋白质分解作用。鉴于研究自由生活鸟类的基线 CORT 所涉及的复杂性,需要进行更多的研究,以更好地了解 HPA 轴在调节该鸟类和其他亚热带鸟类的生命史阶段中的关键作用。
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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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