通过大脑中的HP复合体对冬眠的循环控制
Noriaki Kondo1, Tsuneo Sekijima, Jun Kondo
1Mitsubishi Kagaku Institute of Life Sciences, Machida, Tokyo 194-8511, Japan. nkondo@libra.ls.m-kagaku.co.jp
Cell
|April 18, 2006
概括
冬眠是由一个新发现的冬眠特异性蛋白 (HP) 激素调节的,由内体时钟控制. 这种蛋白质向大脑发出信号,启动和维持哺乳动物的冬眠.
科学领域:
- 哺乳动物生理学 哺乳动物生理学
- 时间生物学 时间生物学
- 内分泌学 在内分泌学.
背景情况:
- 季节性冬眠是哺乳动物的一个复杂的适应,在恶劣条件下对生存至关重要.
- 控制冬眠的开始和维持的精确调节机制和因素在很大程度上是未知的.
- 之前的研究表明,在野的冬眠期间,特定蛋白质复合体的减少.
研究的目的:
- 为了确定负责调节季节性冬眠的候选激素.
- 阐明冬眠过程中冬眠特异性蛋白质 (HP) 复合物的作用.
- 研究HP,周年节律和冬眠期间的体温调节之间的关系.
主要方法:
- 确定了冬眠特异性蛋白 (HP) 作为候选激素.
- 在受控的寒冷和黑暗条件下,监测的HP水平,以评估环年节律的调节.
- 研究了HP调节及其对体温的影响,而不依赖于环境温度.
- 给出了抗体来阻止大脑HP活动,并观察了对冬眠时间的影响.
主要成果:
- 黑猩猩的HP水平是由内生环年节律调节的,与冬眠周期相关.
- 大脑HP复合物的水平与冬眠的开始同时增加.
- 大脑中的HP调节发生在温暖条件下独立于体温变化;只有当大脑HP在寒冷中增加时,体温才会下降.
- 阻断大脑HP活动显著减少了冬眠的持续时间.
结论:
- 冬眠特异性蛋白 (HP) 被认为是调节哺乳动物季节性冬眠的关键激素因素.
- 惠普充当调解者,将来自内部环年节律的信号传送到大脑,这对于启动和维持冬眠至关重要.
- 这些发现为冬眠的分子和生理基础提供了关键的见解.
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