Schwann cell multiplication in Trembler mice

Area of Science:

• Neuroscience
• Cell Biology
• Genetics

Background:

• The Trembler mouse model displays peripheral nerve abnormalities.
• Characterized by reduced myelin and increased Schwann cells.

Purpose of the Study:

• Investigate the cause of Schwann cell proliferation in Trembler mice.
• Determine if the defect lies within Schwann cells or the axon.

Main Methods:

• Radioautographic and quantitative morphologic analysis.
• Schwann cell proliferation studies in vivo.
• Sciatic nerve transplantation experiments.

Main Results:

• Persistent postnatal Schwann cell proliferation observed in Trembler nerves.
• Normal Schwann cell behavior in unmyelinated Remak fibers.
• Transplanted Trembler nerve segments replicated proliferation and myelin deficit.

Conclusions:

• Trembler Schwann cells have an intrinsic inability to form myelin.
• Axonal or systemic factors are unlikely causes of the observed pathology.
• The primary defect resides in the Schwann cell's myelination capacity.