Targeting SARM1 improves autophagic stress-induced axonal neuropathy

Area of Science:

• Neuroscience
• Genetics
• Cell Biology

Background:

• Charcot-Marie-Tooth disease (CMT) is a group of inherited peripheral neuropathies.
• Axonal degeneration is a key pathological feature in CMT, leading to progressive disability.
• Identifying molecular mechanisms driving axonal degeneration is crucial for developing effective treatments.

Purpose of the Study:

• To investigate the role of sterile alpha and HEAT/Armadillo motif containing 1 (SARM1) in axonal degeneration in CMT.
• To evaluate the therapeutic potential of inhibiting SARM1 in CMT models.

Main Methods:

• Utilized conditional knockout (cKO) models to delete SARM1 in specific neuronal populations.
• Employed immunofluorescence (IF) and field emission scanning electron microscopy (FE-SEM) for detailed morphological analysis.
• Assessed nerve function using nerve conduction velocity (NCV) measurements.

Main Results:

• SARM1 deletion significantly protected axons from degeneration in CMT models.
• Conditional knockout of SARM1 in dorsal root ganglion (DRG) neurons prevented distal axonal loss.
• Nerve conduction velocity was preserved in SARM1-deficient CMT models.

Conclusions:

• SARM1 is a critical mediator of axonal degeneration in the context of CMT.
• Inhibition of SARM1 demonstrates significant neuroprotective effects in CMT models.
• Targeting SARM1 represents a promising therapeutic strategy for treating Charcot-Marie-Tooth disease.