Peripheral nervous system plasmalogens regulate Schwann cell differentiation and myelination

Area of Science:

• Neuroscience
• Biochemistry
• Developmental Biology

Background:

• Rhizomelic chondrodysplasia punctata (RCDP) is a developmental disorder linked to ether phospholipid biosynthesis deficiency.
• Plasmalogens, abundant in nervous tissue, are crucial for myelin, but their peripheral nervous system role is unclear.

Purpose of the Study:

• To investigate the role of plasmalogens in peripheral nerve development and myelination using RCDP mouse models.
• To identify molecular mechanisms underlying plasmalogen deficiency-induced neuropathology.

Main Methods:

• Analysis of peripheral nerves in mouse models of RCDP.
• Assessment of Schwann cell development, differentiation, and myelination.
• Investigation of protein kinase B (AKT) and glycogen synthase kinase 3β (GSK3β) signaling pathways.
• Treatment with GSK3β inhibitors (lithium, TDZD-8).

Main Results:

• Plasmalogen deficiency impaired Schwann cell development, radial sorting, and myelination.
• Defective AKT phosphorylation and activated GSK3β were observed in mutant mice nerves.
• GSK3β inhibition by lithium or TDZD-8 rescued Schwann cell defects.

Conclusions:

• Plasmalogens are essential for proper Schwann cell differentiation and myelination.
• Plasmalogen deficiency leads to neuropathology via dysregulated membrane and cell signaling.
• Targeting GSK3β offers a potential therapeutic strategy for RCDP-related neuropathies.