Aug 1, 1980

Ultrastructural studies of the dying-back process. V. Axonal neurofilaments accumulate at sites of 2,5-hexanedione application: evidence for nerve fibre dysfunction in experimental hexacarbon neuropathy

Journal of Neurocytology
M J PolitisP S Spencer


This study examined the thesis that 2,5-dexanedione (2,5-HD) produces distal (dying-back) axonopathy by direct toxic action on nerve fibers. Single or repeated application of undiluted or 10% 2,5-HD to exposed rat sciatic nerves caused some fibres to develop focal axonal swellings filled with abnormally large numbers of 10 nm neurofilaments. Such changes occurred within four days of application and were especially prominent in equivalently treated nerve segments obtained from animals orally exposed to 0.5% 2,5-HD before surgery. Nerve fibers along the perimeter of tibial nerve fascicles exposed to 2,5-HD or 2,4-hexanedione (2,4-HD), a compound unable to produce systemic neuropathy, underwent non-specific breakdown and Schwann cell necrosis. Nerve fibres located in the centre of such fascicles only developed an hypertrophied paranuclear Schwann cell cytoplasm and did not proliferate intermediate filaments. Saline, hydrochloric acid and 1,6-hexanediol, a water-soluble hexacarbon also lacking systemic neurotoxic properties, produced no intra-fascicular changes when locally applied to the sciatic nerve. It is concluded (1) that 2,5-HD causes a giant axonal swellings by direct toxic action on the nerve fibre, (2) 2,5-HD does not ind...Continue Reading

Mentioned in this Paper

Structure of Sciatic Nerve
Schwann Cell Cytoplasm
Nerve Fibers
Plant fiber
Hexamethylene glycol
Giant Axonal Neuropathy 1

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