期刊
出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2121273119
关键词
axon regeneration; mitochondrial dynamics; peripheral nerve injury; optic nerve crush; visual function recovery
资金
- General Research Fund from Research Grant Council of the Government of the Hong Kong Special Administrative Region [CityU 11100519, CityU 11100318]
- Health and Medical Research Fund, Food and Health Bureau, Hong Kong Special Administrative Region Government [07181356]
This study discovered that a small molecule called M1 can promote mitochondrial fusion and transport, leading to the regeneration of axons and the recovery of visual function and neural activities after optic nerve injuries.
Axon regeneration is an energy-demanding process that requires active mitochondrial transport. In contrast to the central nervous system (CNS), axonal mitochondrial transport in regenerating axons of the peripheral nervous system (PNS) increases within hours and sustains for weeks after injury. Yet, little is known about targeting mitochondria in nervous system repair. Here, we report the induction of sustained axon regeneration, neural activities in the superior colliculus (SC), and visual function recovery after optic nerve crush (ONC) by M1, a small molecule that promotes mitochondrial fusion and transport. We demonstrated that M1 enhanced mitochondrial dynamics in cultured neurons and accelerated in vivo axon regeneration in the PNS. Ex vivo time-lapse imaging and kymograph analysis showed that M1 greatly increased mitochondrial length, axonal mitochondrial motility, and transport velocity in peripheral axons of the sciatic nerves. Following ONC, M1 increased the number of axons regenerating through the optic chiasm into multiple subcortical areas and promoted the recovery of local field potentials in the SC after optogenetic stimulation of retinal ganglion cells, resulting in complete recovery of the pupillary light reflex, and restoration of the response to looming visual stimuli was detected. M1 increased the gene expression of mitochondrial fusion proteins and major axonal transport machinery in both the PNS and CNS neurons without inducing inflammatory responses. The knockdown of two key mitochondrial genes, Opa1 or Mfn2, abolished the growth-promoting effects of M1 after ONC, suggesting that maintaining a highly dynamic mitochondrial population in axons is required for successful CNS axon regeneration.
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