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Central prolactin binding site densities change seasonally in an adult male passerine bird (Junco hyemalis)
Journal of Chemical Neuroanatomy ( IF 2.8 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.jchemneu.2020.101786 Kristina O Smiley 1 , John D Buntin 2 , Cynthia Corbitt 3 , Pierre Deviche 4
Journal of Chemical Neuroanatomy ( IF 2.8 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.jchemneu.2020.101786 Kristina O Smiley 1 , John D Buntin 2 , Cynthia Corbitt 3 , Pierre Deviche 4
Affiliation
Seasonal reproduction is common across temperate zone avian species. In these species, physiological and behavioral adaptions have evolved to change according to day length (i.e., seasonally) in order to maximize reproductive output. The hormone prolactin regulates many aspects of parental care, a critical component of reproductive success. Its secretion in birds has been shown to be under photoperiodic control, with the highest levels measured in the spring and summer months, when birds breed and show parental care. However, to date, no study has tested whether the densities of central prolactin binding sites vary seasonally, which may also account for prolactin's effect on parental care. To test this, we collected brains from free-ranging adult male dark-eyed juncos, Junco hyemalis, a biparental songbird, in the spring, summer, and fall, and used quantitative in vitro autoradiography to compare the densities of specific prolactin binding sites across 20 different brain regions. Prolactin binding sites were found in regions that regulate parental behavior in other avian species. During the summer, several hypothalamic regions that regulate parental care, including the preoptic area and tuberal nucleus, contained lower densities of prolactin binding sites, suggesting exposure to higher endogenous prolactin levels, than at other times. This observation is consistent with the fact that circulating prolactin is highest during summer, when males would be providing care to young. Overall, these data suggest that prolactin binding sites are relatively conserved in the avian brain and that central prolactin activity supports parental care efforts in juncos and other avian species.
中文翻译:
成年雄性雀鸟(Junco hyemalis)的中枢催乳素结合位点密度随季节变化
季节性繁殖在温带鸟类中很常见。在这些物种中,生理和行为适应已经进化为根据日长(即季节性)发生变化,以最大限度地提高繁殖产量。催乳激素调节父母照顾的许多方面,这是生殖成功的关键组成部分。它在鸟类中的分泌已被证明受光周期控制,在春季和夏季的月份中测量到的水平最高,此时鸟类繁殖并表现出父母的照顾。然而,迄今为止,还没有研究测试过中枢催乳素结合位点的密度是否随季节变化,这也可能是催乳素对父母照顾的影响的原因。为了测试这一点,我们在春季、夏季和秋季从自由放养的成年雄性黑眼 juncos,Junco hyemalis,一种双亲鸣禽中收集了大脑,并使用定量体外放射自显影来比较 20 个不同大脑区域中特定催乳素结合位点的密度。在其他鸟类物种中调节亲代行为的区域中发现了催乳素结合位点。在夏季,调节父母照料的几个下丘脑区域,包括视前区和结节核,含有较低密度的催乳素结合位点,表明与其他时间相比,暴露于更高的内源性催乳素水平。这一观察结果与循环催乳素在夏季最高的事实是一致的,此时男性会照顾年轻人。总体而言,这些数据表明催乳素结合位点在鸟类大脑中相对保守,并且中枢催乳素活性支持双亲和其他鸟类物种的父母护理工作。
更新日期:2020-07-01
中文翻译:
成年雄性雀鸟(Junco hyemalis)的中枢催乳素结合位点密度随季节变化
季节性繁殖在温带鸟类中很常见。在这些物种中,生理和行为适应已经进化为根据日长(即季节性)发生变化,以最大限度地提高繁殖产量。催乳激素调节父母照顾的许多方面,这是生殖成功的关键组成部分。它在鸟类中的分泌已被证明受光周期控制,在春季和夏季的月份中测量到的水平最高,此时鸟类繁殖并表现出父母的照顾。然而,迄今为止,还没有研究测试过中枢催乳素结合位点的密度是否随季节变化,这也可能是催乳素对父母照顾的影响的原因。为了测试这一点,我们在春季、夏季和秋季从自由放养的成年雄性黑眼 juncos,Junco hyemalis,一种双亲鸣禽中收集了大脑,并使用定量体外放射自显影来比较 20 个不同大脑区域中特定催乳素结合位点的密度。在其他鸟类物种中调节亲代行为的区域中发现了催乳素结合位点。在夏季,调节父母照料的几个下丘脑区域,包括视前区和结节核,含有较低密度的催乳素结合位点,表明与其他时间相比,暴露于更高的内源性催乳素水平。这一观察结果与循环催乳素在夏季最高的事实是一致的,此时男性会照顾年轻人。总体而言,这些数据表明催乳素结合位点在鸟类大脑中相对保守,并且中枢催乳素活性支持双亲和其他鸟类物种的父母护理工作。