神经营养素及其受体在胎儿发育过程中的表达在人类尾细胞中
Claudia Steinacher1, Shin-Ya Nishio2, Shin-Ichi Usami2
1Department of Otorhinolaryngology, Medical University Innsbruck, 6020 Innsbruck, Austria.
International journal of molecular sciences
|December 17, 2024
概括
像BDNF和NT-3这样的神经营养素对人类内耳发育至关重要,它们的表达模式指导神经生长和成熟. 了解这些途径是神经营养再生疗法的关键.
科学领域:
- 发育神经科学的发展神经科学.
- 视觉发展的发展
- 分子生物学分子生物学
背景情况:
- 神经营养素及其受体在神经元发育和生存中起着至关重要的作用.
- 神经营养因子在人类内耳发育中的具体作用尚未完全阐明.
- 了解胎儿内耳发育对于评估神经营养再生疗法至关重要.
研究的目的:
- 确定关键神经原蛋白 (BDNF,NT-3,NGF,NT-4) 和它们的受体 (TrkA,TrkB,TrkC,p75) 在人类发育中的内耳中的表达水平和定位.
- 研究BDNF和NT-3/TrkC信号传递的时空表达模式和细胞源.
- 阐明TrkB和TrkC信号通路在人类胎儿内耳发育中的功能作用.
主要方法:
- 胎儿人类内耳样本的RNA测序 (RNAseq) 分析.
- 在现场杂交以量化BDNF表达在组织学部分 (妊娠9-19周).
- 免疫阻隔以识别TrkB和TrkC蛋白位址和信号标.
主要成果:
- 在人类发育中的内耳中检测到TrkB和TrkC受体以及BDNF,NT-3和NT-4配体.
- 螺旋质神经元 (SGNs) 和卫星质细胞是BDNF的主要来源,其表达在GW10和GW15-17达到顶峰.
- BDNF表达梯度在发育过程中发生变化,与SGN成熟和内化密度相关. NT-3/TrkC表达反映了BDNF/TrkB模式,而NT-4表达与BDNF/NT-3相反相关,这表明它具有调节作用.
结论:
- 该研究确定了特定的神经营养因子表达模式和信号通路,这些通路对人类内耳发育至关重要,包括神经指导,内化和成熟.
- TrkB和TrkC信号通路针对不同的细胞群,包括SGN,质细胞和支持细胞.
- 这些发现为理解人类眼睛发育和评估神经营养疗法的疗效提供了基础.
相关概念视频
01:30Neurulation
41.7K
Neurulation is the embryological process which forms the precursors of the central nervous system and occurs after gastrulation has established the three primary cell layers of the embryo: ectoderm, mesoderm, and endoderm. In humans, the majority of this system is formed via primary neurulation, in which the central portion of the ectoderm—originally appearing as a flat sheet of cells—folds upwards and inwards, sealing off to form a hollow neural tube. As development proceeds, the...
41.7K
01:13The Cochlea
44.5K
The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
44.5K