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Cellular and molecular mechanisms of low dose prolactin potentiation of testicular development in cockerels

机译:低剂量催乳素的细胞和分子机制在公鸡睾丸发育的睾丸发育的增强

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摘要

The aim of this study was to determine the cellular and molecular mechanisms of prolactin (PRL) in testicular development of prepubertal cockerels. In an in vivo animal experiment, active immunization against PRL severely depressed prepubertal testicular development by significantly reducing testicular weights at both 122 and 164 d of age. The number of elongated spermatids in the seminiferous tubules was also significantly decreased by immunization with 199-residue chicken PRL (cPRL) at age 122 d. Inhibition of testicular development by cPRL immunization was associated with decreases in LH receptor (LHR), FSH receptor (FSHR), Stat5b, P450scc, steroidogenic acute regulatory (StAR) protein, and 3 beta-hydroxysteroid dehydrogenase (3 beta-HSD) mRNA expression levels in testicular tissue. In in vitro experiments, testosterone production by cultured Leydig cells isolated from prepubertal cockerel testes was dose-dependently enhanced by treatment with bioactive recombinant PRI, but a lesser response was seen with high concentrations of PRL. The distinct changes in testosterone production in response to high and low concentrations of added PRL were paralleled by similar patterns of change in the mRNA levels of Stat5b, LHR, P450scc, StAR, 3 beta-HSD, and CYP17A1 in cultured Leydig cells, as well as protein amounts of phosphorylated Jak2 and Stat5a/b. In conclusion, low to medium doses of PRL potentiate testis development in prepubertal cockerels by enhancing testosterone secretion from Leydig cells via activation of PRLR/Stat5b signal transduction, which upregulates mRNA expression of LHR and testosterone synthesizing enzymes. However, this positive regulation was weaker in response to a high dose of PRL, which reduced PRLR/Stat5b signal transduction and the expression of genes involved in LH signaling and testosterone synthesis. (C) 2019 Elsevier Inc. All rights reserved.
机译:本研究的目的是确定催乳素(PRL)在青春期前公鸡睾丸发育中的细胞和分子机制。在一项活体动物实验中,PRL主动免疫可显著降低122和164日龄的睾丸重量,从而严重抑制青春期前睾丸发育。在122日龄时,用199个残基鸡PRL(cPRL)免疫,生精小管中细长精子细胞的数量也显著减少。cPRL免疫抑制睾丸发育与LH受体(LHR)、FSH受体(FSHR)、Stat5b、P450scc、类固醇生成急性调节(StAR)蛋白、,睾丸组织中3β-羟基类固醇脱氢酶(3β-HSD)mRNA的表达水平。在体外实验中,通过生物活性重组PRI处理,从青春期前公鸡睾丸分离的培养的睾丸间质细胞产生的睾酮呈剂量依赖性增加,但在高浓度PRL下反应较小。随着高浓度和低浓度添加PRL,睾酮产生的显著变化与培养的睾丸间质细胞中Stat5b、LHR、P450scc、StAR、3βHSD和CYP17A1的mRNA水平以及磷酸化Jak2和Stat5a/b的蛋白质量的类似变化相平行。总之,低至中剂量的PRL通过激活PRLR/Stat5b信号转导,促进睾丸间质细胞分泌睾酮,从而增强青春期前公鸡睾丸的发育,该信号转导可上调LHR和睾酮合成酶的mRNA表达。然而,高剂量的PRL降低了PRLR/Stat5b信号转导以及参与LH信号和睾酮合成的基因的表达,这种正性调节作用较弱。(C) 2019爱思唯尔公司版权所有。

著录项

  • 来源
    《Domestic Animal Endocrinology》 |2019年第1期|共11页
  • 作者单位

    Jiangsu Acad Agr Sci Inst Anim Sci Lab Anim Improvement &

    Reprod Nanjing 210014 Jiangsu Peoples R China;

    Jiangsu Acad Agr Sci Inst Anim Sci Lab Anim Improvement &

    Reprod Nanjing 210014 Jiangsu Peoples R China;

    Jiangsu Acad Agr Sci Inst Anim Sci Lab Anim Improvement &

    Reprod Nanjing 210014 Jiangsu Peoples R China;

    Jiangsu Acad Agr Sci Inst Anim Sci Lab Anim Improvement &

    Reprod Nanjing 210014 Jiangsu Peoples R China;

    Jiangsu Acad Agr Sci Inst Anim Sci Lab Anim Improvement &

    Reprod Nanjing 210014 Jiangsu Peoples R China;

    Jiangsu Acad Agr Sci Inst Anim Sci Lab Anim Improvement &

    Reprod Nanjing 210014 Jiangsu Peoples R China;

    Jiangsu Acad Agr Sci Inst Anim Sci Lab Anim Improvement &

    Reprod Nanjing 210014 Jiangsu Peoples R China;

    Jiangsu Acad Agr Sci Inst Anim Sci Lab Anim Improvement &

    Reprod Nanjing 210014 Jiangsu Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 兽医内科学;
  • 关键词

    Cockerels; Prolactin; Testicular development; Testosterone; Molecular mechanisms;

    机译:公鸡;催乳素;睾丸发育;睾酮;分子机制;

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