在雌性瓜纳科 (Lama guanicoe) 中,下丘脑-垂体-腺轴对光周期变化的反应
Lina Maria Correa1, Ricardo D Moreno2, José Luis Riveros3
1Escuela de Medicina Veterinaria, Facultad de Recursos Naturales y Medicina Veterinaria, Universidad Santo Tomás, Carlos Schorr 255, Maule, Talca 3460000, Chile; Centro de Innovación de ovinos para el secano-OVISNOVA, Universidad Santo Tomás, Carlos Schorr 255, Maule, Talca 3460000, Chile; Escuela de postgrado, Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago 8940000, Chile.
雌性瓜纳科的生殖荷尔蒙因季节性变化而波动. 较长的白天增加生殖激素水平 (17β-雌激素,FSH,LH) 和降低黑激素,表明季节性繁殖适应.
科学领域:
- 生殖内分泌学 生殖内分泌学
- 驼体生理学 驼体生理学
- 季节性繁殖生物学
背景情况:
- 瓜纳科对极端环境表现出强大的性.
- 雌性驼的季节性繁殖,特别是在长光周期期间,尚不清楚.
- 光周期对瓜纳科斯的生殖激素的影响需要进一步研究.
研究的目的:
- 为了研究下丘脑-垂体-腺轴的季节性反应在雌性瓜纳科斯.
- 确定短天 (10L:14D) 与长天 (16L:8D) 对生殖激素度的影响.
- 探索黑激素及其受体在调解季节性生殖变化的作用.
主要方法:
- 在短日 (七月) 和长日 (十二月) 期间,从14名成年雌性瓜纳科群中采集了血液样本.
- 测量了黑色素,17β-雌激素,卵泡刺激激素 (FSH) 和黄素激素 (LH) 的度.
- 检测到黑激素受体1A和kisspeptin在下丘脑和垂体组织中的表达.
主要成果:
- 与短日相比,长日期间的黑色素度明显较低.
- 17β-雌激醇,FSH和LH度在长日期间明显高于短日.
- 黑色素受体1A和kisspeptin在下丘脑和垂体表达,证实松果腺对光周期的敏感性.
结论:
- 雌性瓜纳科的生殖激素度表现出季节性变化.
- 下垂体-垂体-腺轴在雌性瓜纳科的短时间和长时间中以不同的方式调节.
- 光周期的季节性变化会影响生殖激素配置,这表明季节性繁殖的机制.
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