甲基引起的视力缺陷涉及斑马鱼胚胎视网膜中GABAergic细胞的损失
Jinghan Wang1, Shaojuan Guo1, Lixin Yang1
1State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, 100012 Beijing, China.
The Science of the total environment
|January 5, 2025
概括
斑马鱼胚胎中的甲基 (MeHg) 暴露显著减少了关键的视网膜神经元和视力受损. 这种神经毒剂破坏了眼睛的发育和细胞平衡,导致视力缺陷.
科学领域:
- 神经科学是一个神经科学.
- 发展生物学 发展生物学
- 毒理学 毒理学 毒理学
背景情况:
- 甲基 (MeHg) 是一种已知的神经毒剂,在各种物种中影响视觉系统.
- 临床观察将MeHg暴露与视觉缺陷联系起来,如色彩视觉改变和失明.
- 对于MeHg对眼睛发育的影响仍然不完全理解.
研究的目的:
- 为了研究MeHg对斑马鱼胚胎视网膜细胞发育,特别是GABAergic神经元的影响.
- 使用RNA测序分析MeHg暴露后视网膜的基因表达变化.
- 为了确定MeHg暴露是否会导致斑马鱼眼中的发育缺陷.
主要方法:
- 斑马鱼胚胎在受精后4至96小时内暴露于MeHg (10-30μg/L).
- 视网膜细胞,特别是质细胞层 (GCL) 和内核层 (INL) 中的GABAergic神经元,被量化.
- 深度RNA测序 (RNA-seq) 在暴露于MeHg的斑马鱼眼睛上进行.
- 在斑马鱼幼虫上进行了行为测试,包括颜色偏好和光运动反应 (OMR).
主要成果:
- 暴露于MeHg显著降低了GCL和INL中的GABAergic神经元数量.
- 20μg MeHg/L的度消除了5天大的幼虫的颜色偏好,并在6天大的幼虫中降低了OMR.
- 在接受MeHg治疗的眼睛中,RNA-seq揭示了参与氧化还原稳定,类固醇激素和叶酸生物合成,溶解体活性和亡的基因的丰富.
- MeHg改变了opsin基因和基因的表达,这些基因对斑马鱼眼睛发育中的光传导至关重要.
结论:
- 暴露于MeHg会干扰斑马鱼的视网膜细胞发育,因为它会干扰细胞分化和恒温.
- 这些发育障碍导致斑马鱼幼虫观察到的视力缺陷.
- 这些发现突出了MeHg作为一种对发育有毒物质,影响眼睛结构和视觉功能.
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