Ruinan Shen, Kijung Sung, Jianqing Ding, Chengbiao Wu
Axons are unique structural and functional features of nerve cells, which play a critical role in regulating neuronal homeostasis. Dysfunction and degeneration of axons (axonopathy) has been established as an early and prominent contributing mechanism to the pathogenesis of neurodegenerative diseases including Alzheimer's disease, Parkinson's disease, Huntington's disease, and amyotrophic lateral sclerosis. In this review, we briefly summarize the structure and function of axons, and highlight recent advances in the understanding of the role of axons in health and disease. We argue that axons are a potential target for developing novel therapies for neurodegenerative diseases.