Myelin basic protein enhances axonal regeneration from neural progenitor cells

Area of Science:

• Neuroscience
• Regenerative Medicine
• Biochemistry

Background:

• Neural progenitor cell (NPC) therapy shows promise for spinal cord injury (SCI) recovery.
• Myelin presence stimulates axonal regeneration from mammalian NPCs.
• Myelin-associated proteins are hypothesized to contribute to NPC-mediated axonal regeneration.

Purpose of the Study:

• To identify key genes involved in myelin-associated axonal regeneration from NPCs.
• To investigate the role of myelin basic protein (Mbp) in NPC axonal regeneration.
• To elucidate the signaling pathways mediating Mbp's effects on NPC neurite outgrowth and in vivo SCI recovery.

Main Methods:

• Bioinformatic analysis identified Mbp as a key gene.
• Utilized murine, rat, and human iPSC-derived NPCs with Mbp knockout/overexpression and pathway modulators.
• Assessed in vivo locomotive recovery and axonal regeneration in a murine dorsal column crush SCI model using engineered NPCs on scaffolding.

Main Results:

• Mbp promotes NPC axonal outgrowth in a Mbp-dependent manner, mediated by L1-70.
• Mbp/L1-70 stimulates NPC neurite outgrowth via PPARγ-mediated repression of differentiation genes and Erk1/2 activation.
• In vivo, Mbp-overexpressing NPCs significantly improved locomotive recovery and axonal regeneration in SCI mice.

Conclusions:

• Mbp supports mammalian NPC axonal regeneration through the novel Mbp/L1cam/Pparγ signaling pathway.
• Bioengineered NPC interventions hold potential for promoting axonal regeneration and functional recovery post-SCI.