在神经肌肉结处确定上腺素前同步和后同步蛋白位,在衰老过程中减少,并通过尼古丁胺胺单核酸的管理恢复
Kotaro Takeno1, Nobuhiro Watanabe2, Masashi Morifuji3
1Laboratory of Neurobiology of Aging.
Neuroreport
|June 27, 2024
概括
衰老通过减少关键蛋白质,损害了神经肌肉结处的交感神经功能. 尼古丁胺胺 mononucleotide (NMN) 治疗逆转这些与年龄相关的衰退在老年小鼠.
科学领域:
- 神经科学是一个神经科学.
- 衰老研究研究 衰老研究
- 分子生物学分子生物学
背景情况:
- 神经肌肉结 (NMJs) 对于运动控制至关重要,从运动神经和交感神经接收输入.
- 随着年龄的增长,运动内核的交感调节会下降,但潜在的机制仍然不清楚.
- 了解NMJ的与年龄相关的变化对于解决功能衰退至关重要.
研究的目的:
- 研究老化对老鼠NMJs交感神经和相关突触蛋白的影响.
- 确定尼古丁胺胺单核酸 (NMN) 是否可以改善NMJ的与年龄相关的缺陷.
主要方法:
- 免疫组织化学用于可视化小鼠NMJ中的交感神经 (铁氨酸氧酶),前突触 (膀单胺转运体2) 和后突触 (β2-上腺素受体) 蛋白质.
- 在成年,老年和接受NMN治疗的老年小鼠之间进行了比较.
- 进行了蛋白质信号强度的定量分析.
主要成果:
- 虽然交感神经标记物 (氨酸氧酶) 的强度随着年龄的增长而保持不变,但在老年小鼠中,前突触性 (膀性单胺转运体2) 和后突触性 (β2-上腺体受体) 蛋白质水平下降.
- 尼古丁胺胺 mononucleotide (NMN) 给药一个月恢复了囊泡单胺转运体2和β2-上腺素受体水平,达到成年小鼠的水平.
- NMN没有影响氨酸氧酶表达水平.
结论:
- 衰老导致NMJ的交感内核功能下降,其特征是降低了前突触和后突触蛋白质表达.
- 尼古丁胺胺 mononucleotide (NMN) 有效地逆转这些与年龄相关的分子缺陷在NMJ,表明与年龄相关的神经肌肉功能障碍的治疗潜力.
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