Novel laser model of optic nerve transection provides valuable insights about the dynamics of optic nerve regeneration

新型视神经横断激光模型为视神经再生动力学提供了宝贵见解

阅读:4
作者:Chloe Moulin, Galina Dvoriantchikova, Niloufar Bineshfar, Ben Swingle, Gaby Martinez, Daniel Groso, Michelle Zhang, Dmitry Ivanov, Daniel Pelaez

Abstract

Optic nerve (ON) injury causes blindness in adult mammals as their retinal ganglion cells (RGCs) cannot regenerate axons. However, amphibian RGC axons do not experience the same regenerative failure. Studying the regeneration process of the ON in amphibians holds profound implications for regenerative medicine and human health. Using transgenic tadpoles and laser micro-optics, we developed a reproducible ON transection and regeneration model. Through microscopy of axon dynamics, functional testing to assess visual pathway recovery, TUNEL cell death and EdU cell proliferation assays, and RNA-seq of the retina and optic nerve, we characterized the optic nerve injury response and subsequent recovery. Our model suggests no chemoattractant gradient exists early in regeneration, with defasciculated axons sprouting in random directions from the globe-proximal cut end. Once individual axons reach the appropriate targets in the brain, their tract is reinforced by other regenerating axons, restoring normal ON morphology. Thus, guidance cues or scaffolding from brain-innervating axons likely support later stages of regeneration. After 14 days, the regenerated ON is morphologically indistinguishable from the naïve ON, and visual function is restored. We found no evidence of RGC death or new RGC formation in the model, suggesting that ON regeneration involves remodeling of injured axons of pre-existing RGCs.

特别声明

1、本文转载旨在传播信息,不代表本网站观点,亦不对其内容的真实性承担责任。

2、其他媒体、网站或个人若从本网站转载使用,必须保留本网站注明的“来源”,并自行承担包括版权在内的相关法律责任。

3、如作者不希望本文被转载,或需洽谈转载稿费等事宜,请及时与本网站联系。

4、此外,如需投稿,也可通过邮箱info@biocloudy.com与我们取得联系。