Structures and Molecular Composition of Schmidt-Lanterman Incisures
Nobuo Terada1, Yurika Saitoh2,3, Akio Kamijo2
1Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, Matsumoto City, Nagano, Japan. nobuot@shinshu-u.ac.jp.
Advances in Experimental Medicine and Biology
|November 25, 2019
Summary
Schmidt-Lanterman incisure (SLI) in the peripheral nervous system (PNS) involves specific molecular complexes. Protein 4.1G is crucial for targeting these complexes, ensuring proper myelin formation and structural stability in Schwann cells.
Area of Science:
- Neuroscience
- Cell Biology
- Peripheral Nervous System (PNS) Research
Background:
- Schmidt-Lanterman incisures (SLIs) are unique cone-shaped structures within the myelin sheath of peripheral nervous system (PNS) nerve fibers.
- These structures, formed by Schwann cells, exhibit spring-like elongation under tension.
- Understanding the molecular composition and function of SLIs is key to comprehending myelin maintenance and nerve health.
Purpose of the Study:
- To identify and characterize molecular complexes within the Schmidt-Lanterman incisures (SLIs).
- To investigate the specific role of protein 4.1G in the organization of SLI molecular architecture.
- To elucidate the functional significance of SLIs in peripheral nerve myelination and integrity.
Main Methods:
- Demonstration of various molecular complexes present in SLIs.
- Focus on the membrane skeleton, specifically the protein 4.1G-membrane protein palmitoylated 6 (MPP6)-cell adhesion molecule 4 (CADM4) complex.
- Analysis of motor activity and myelin ultrastructure in 4.1G-deficient mice.
Main Results:
- Protein 4.1G was identified as essential for the correct molecular targeting of MPP6 and CADM4 within SLIs.
- Mice deficient in 4.1G exhibited abnormalities in motor function and myelin ultrastructure.
- These findings highlight the critical role of 4.1G in Schwann cell myelin formation.
Conclusions:
- The Schmidt-Lanterman incisure (SLI) plays a significant role in the structural stability of Schwann cell myelin.
- SLIs are likely involved in regulating cell adhesion and signal transduction pathways essential for nerve function.
- Protein 4.1G is indispensable for the proper formation and maintenance of myelin in the peripheral nervous system.
Keywords:
Cell adhesion moleculeCharcot–Marie–Tooth neuropathyMembrane palmitoylated protein familyMembrane skeletonProtein 4.1 familySchmidt–Lanterman incisureSchwann cellMore Related Videos
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