遗传背景驱动与年龄相关的突触维护和结构在皮质和海马神经回路的突触维护和结构上的差异
Sarah E Heuer1,2, Emily W Nickerson1,2, Gareth R Howell1,2,3
1The Jackson Laboratory, Bar Harbor, Maine, USA.
Aging cell
|December 22, 2023
概括
遗传差异影响认知衰老. 耐药小鼠保持突触连接,表明成功的认知衰老和延长健康寿命的新治疗点.
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
- 认知能力下降 认知能力下降
背景情况:
- 神经元电路中的突触损失是与年龄相关的认知衰退的关键因素.
- 认知衰老有所不同,但影响突触维护或脆弱性的遗传因素尚未得到充分理解.
- 之前的研究表明,在衰老过程中,前额叶皮质 (PFC) 发生了广泛的突触损失,但海马体没有.
研究的目的:
- 为了研究衰老对海马-皮质-体内皮质电路投射神经元中的突触的影响.
- 为了比较基因上不同的小鼠菌株的突触变化,在衰老过程中对认知能力下降的敏感性不同.
- 通过突触维护识别成功认知衰老的基因机制.
主要方法:
- 在两种老鼠菌株 (C57BL/6J和PWK/PhJ) 的投影神经元上检查了突触密度和形态,老化易感性不同.
- 专注于CA1-to-PFC和PFC-to-nucleus重聚 (RE) 投影神经元参与空间工作记忆.
- 利用了来自两种菌株的老年和年轻小鼠的比较分析.
主要成果:
- 在CA1-PFC投射神经元上的突触密度在两种小鼠菌株中与年龄保持不变.
- 年龄较大的C57BL/6J小鼠在PFC-to-RE投射神经元上显示出显著的突触损失,与耐药PWK/PhJ小鼠不同.
- 老年PWK/PhJ小鼠的突触显示了改变的形态,表明树突脱极化效率提高.
结论:
- 与年龄相关的认知衰退的抵抗部分由与年龄相关的突触适应作用.
- PWK/PhJ小鼠菌株表现出突触弹性机制,可以防止与年龄相关的认知衰退.
- 在PWK/PhJ小鼠中识别这些机制可能会揭示促进成功的认知衰老和延长人类健康寿命的治疗点.
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