Stage-specific extracellular vesicle cargo from Schwann cells orchestrates peripheral nerve regeneration
Sharma, M.; Kongsomros, S.; Sheth, M.; Chutipongtanate, S.; Esfandiari, L.
Show abstract
Schwann cells (SCs) play a critical role in peripheral nerve regeneration, undergoing dynamic phenotype transitioning from myelinating to repair stages following injury. While SC-derived extracellular vesicles (SC-EVs) have emerged as key mediators of intercellular communication during nerve repair, their stage-specific molecular cargo and functional roles remained incomplete understood. Here, we delineate protein, microRNA and lncRNA landscapes of SC-EVs across distinct differentiation stages, including immature, myelinating, and repair phenotypes, using an in vitro model of primary rat SCs. We show that myelinating SC-EVs are enriched with reprogramming factor SOX2 and neurotrophin receptor p75NTR, while repair SC-EVs carry distinct microRNAs predicted to modulate genes involved in myelin ensheathment, neuronal differentiation and neurogenesis. Moreover, repair SC-EVs contain long non-coding RNAs (lncRNAs) that may regulate miRNA activity. These findings reveal a novel mechanism by which SC-EVs orchestrate neuronal regeneration through stage-specific molecular cargo, and establishes a foundational model for investigating SC plasticity in peripheral nerve repair.
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