索马托斯塔丁调节时钟对傍晚光线的敏感性
Yoshiaki Yamaguchi1,2, Satoru Masubuchi3,4, Emi Kiyokage5,6
1Department of Systems Biology, Kyoto University Graduate School of Pharmaceutical Sciences, 46-29 Yoshida-Shimo-Adachi-Cho, Sakyo-Ku, Kyoto, 606-8501, Japan.
Scientific reports
|November 29, 2025
概括
缺乏体静止素 (SST) 的小鼠在长日光下表现出延迟的活动节奏. 这突出了体静止素-SSTR1系统.
科学领域:
- 时间生物学 时间生物学
- 神经内分泌学神经内分泌学
- 分子生物学分子生物学
背景情况:
- 生物节奏与环境线索同步,如光暗循环.
- 内部生物钟的运行对于生物体的适应至关重要.
- 索马托斯坦素 (SST) 和它的受体SSTR1在生理调节中起作用.
研究的目的:
- 调查体静止素 (SST) 在调节昼夜时钟对光周期的反应中的作用.
- 阐明体静止素受体1 (SSTR1) 参与中央时钟的光敏感性.
主要方法:
- 遗传缺陷模型:体静止素 (SST) 淘汰小鼠和SSTR1淘汰小鼠.
- 药理上抑制SSTR1和使用SSTR1激动剂 (CH-275).
- 在不同的光周期条件下评估昼夜活动阶段.
- 对SSTR1细胞激活的组织学分析.
主要成果:
- 在长光周期下,SST缺乏的小鼠表现出显著的相延迟活动.
- 这种相位延迟在SSTR1淘汰赛小鼠和SSTR1药理抑制中得到复制.
- 组织学证实,SST抑制了光诱导的SSTR1细胞激活.
- 治疗SSTR1主激素CH-275可以使SST缺乏小鼠的昼夜相延缓正常化.
结论:
- 索马托斯塔丁-SSTR1系统在中央昼夜时钟 (SCN) 的光敏感性中起着抑制作用.
- 这一系统对于在长光周期下在黄昏时调节时钟响应尤其重要.
- 这些发现提供了对调节昼夜活动与光周期的分子机制的见解.
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