光强度和光/黑暗周期通过与昼夜节律相关的基因调节小鼠的折射发育和近视
Cong-Ying Li1, Ying Huang1, Mei-Jun Wang1
1Beijing Ophthalmology & Visual Sciences Key Laboratory, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing, 100730, China.
概括
光强度和光/黑暗周期显著影响小鼠的折射发育和近视. 亮光抑制了缺形近视,而暗光效应则取决于光周期.
科学领域:
- 眼科医生 眼科 眼科
- 时间生物学 时间生物学
- 遗传学 遗传学 是一个
背景情况:
- 近视是一个日益严重的全球健康问题.
- 环境因素,包括暴露于光线,都与近视的发展有关.
- 昼夜节律基因和视网膜多巴胺是潜在的调解者.
研究的目的:
- 为了确定光/黑暗 (L/D) 周期和光强度的变化如何影响小鼠的折射发育和形状缺失近视 (FDM).
- 研究这些视觉变化与与昼夜节律相关的基因 (Opn4,Cry1,Per3) 和视网膜/视网膜色素上皮质 (RPE) 中多巴胺水平的表达之间的关联.
主要方法:
- C57BL/6J小鼠 (3周大) 接受了自然折射发育或单眼FDM.
- 在四个L/D周期中,小鼠被暴露在不同强度的光线 (10,300,3000lx) 中,持续了4周.
- 评估了折射误差,轴长 (AL),基因表达 (Opn4,Cry1,Per3) 和视网膜多巴胺水平.
主要成果:
- 延长光周期 (12L/12D,18L/6D,连续光) 在300和3000 lux的自然发育小鼠中诱导近视,与改变的Opn4,Cry1和Per3表达相关.
- 持续的明亮光线 (3000 lx) 显著抑制了FDM进展,与增加的Opn4和Cry1.1相关.
- 暗光 (10 lx) 对FDM表现出光周期依赖的影响,视网膜多巴胺水平与折射变化无关.
结论:
- 光强度和L/D周期是小鼠折射发育和近视进展的关键调节者.
- 观察到的效应与昼夜基因表达变化比视网膜多巴胺水平更强烈相关.
- 优化光照和昼夜调节可能为近视提供治疗策略.
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