Sciatic nerve regeneration in KLF7-transfected acellular nerve allografts

Area of Science:

• Neuroscience
• Molecular Biology
• Regenerative Medicine

Background:

• Krüppel-like Factor 7 (KLF7) is a known transcription factor that aids axon regeneration in the central nervous system.
• Peripheral nerve injuries often result in limited functional recovery, highlighting the need for strategies to promote regeneration.

Purpose of the Study:

• To investigate the efficacy of KLF7 in stimulating axonal regeneration and functional recovery following peripheral nerve injury.
• To determine if KLF7 can enhance nerve repair when delivered via an adeno-associated virus (AAV) vector.

Main Methods:

• Sciatic nerve gap repair in C57BL/6 mice using an acellular nerve allograft (ANA) with either AAV2 or AAV2-KLF7.
• Assessment of KLF7 expression using RT-PCR, western blot, and immunohistochemistry.
• Evaluation of axonal regeneration and functional recovery through retrograde neural tracing (Fluorogold and cholera toxin B), sciatic function index (SFI), ankle angle, Hargreaves test, and electrophysiology.

Main Results:

• AAV2-KLF7 injection significantly increased KLF7 expression in regenerated nerves.
• KLF7 treatment led to improved SFI scores, ankle angle, and increased numbers of FG- and CTB-labeled neurons.
• Enhanced expression of neurofilaments, myelin proteins (P0, S100), and TrkA/TrkB receptors was observed, alongside reduced pain sensitivity.

Conclusions:

• KLF7 significantly promotes axonal regeneration and functional recovery after peripheral nerve injury.
• These findings establish KLF7 as a potent growth-promoting transcription factor for the injured nervous system.
• KLF7 holds promise as a therapeutic agent for enhancing peripheral nerve repair.