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相关概念视频

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Spermatogenesis

Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...

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精子胺合成酶在视网膜层中的定位:早期年龄的变化

Astrid Zayas-Santiago1, Christian J Malpica-Nieves2, David S Ríos3

  • 1Department of Pathology and Laboratory Medicine, Universidad Central del Caribe, Bayamón, PR 00956, USA.

International journal of molecular sciences
|June 27, 2024
PubMed
概括

精子胺 (SPD) 合成在老老鼠视网膜下降,从原始细胞转移到神经元. 穆勒视网膜细胞积累SPD尽管合成减少,突出显示它们在管理聚胺水平中的作用.

关键词:
状细胞区块的状细胞区块.状细胞是状细胞中的一种.神经系统 神经系统神经元神经元的神经元聚氨酸是多氨基的视网膜 视网膜 视网膜 是一个精子中的精子.精子激素合成酶是什么

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科学领域:

  • 神经科学是一个神经科学.
  • 细胞生物学 细胞生物学
  • 衰老研究研究 衰老研究

背景情况:

  • 聚胺精氨酸 (SPD) 对衰老过程至关重要.
  • SPD积聚在米勒视网膜细胞 (MCs) 中,但这些细胞中的SPD合成及其与年龄相关的变化是未知的.

研究的目的:

  • 为了研究精胺合成酶 (SpdS) 的表达和活性,SPD合成酶,在Müller glia和老鼠视网膜的不同年龄点.
  • 了解穆勒细胞在老化过程中SPD代谢中的作用.

主要方法:

  • 免疫细胞化学和西斑 (Western blot,简称WB) 用于分析大鼠视网膜中的SpdS表达在出生后的3,21和120天.
  • 谷氨胺合成酶 (GS) 抗体被用于识别穆勒质细胞.

主要成果:

  • 最初,SpdS在新生儿视网膜原生细胞中得到表达 (P3).
  • 通过P21,SpdS表达转移到神经元,而Müller质细胞 (通过GS识别) 显示最小的SpdS.
  • 与P3.3相比,P21和P120视网膜中的SpdS水平显著下降.
  • 穆勒细胞始终积累了SPD,而不管与年龄相关的合成下降.

结论:

  • 随着年龄的增长,SpdS的再分配表明,SPD的合成发生在原生细胞中,后来发生在神经元中,但不是在Müller细胞中.
  • 穆勒视网膜细胞积极吸收和积累SPD,在衰老期间在视网膜聚胺稳态中发挥关键作用.