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Myelinated axons have four distinct domains: node, paranode, juxta-paranode and internode. The nodes of Ranvier are the sites where action potentials are generated to sustain saltatory conduction. At the paranodes, the terminal myelin loops are tightly connected to the axolemma by adhesion molecules, such as contactin, contactin-associated protein (Caspr) and neurofascin-155. Detachment of the paranodal myelin terminal loops largely affects nerve conduction; massive leak of driving current from the paranodal region leads to significant reduction of the safety factor for impulse transmission and nerve conduction block.
Such disruption of the axo-glial junction can cause axonal damage by interfering axo-glial interaction. Initially ‘axo-glial dysjunction’ was described in spontaneously diabetic BB-Wistar rats that functionally and structurally model human diabetic neuropathy.1 Reduced Na+ …
Funding This work was supported in part by the Health and Labour Sciences Research Grant on Intractable Diseases (Neurodegenerative Diseases) from the Ministry of Health, Labour and Welfare of Japan.
Contributors SK and SM wrote the draft. MM revised the manuscript.
Competing interests None.
Provenance and peer review Commissioned; internally peer reviewed.
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