Schwann cell changes and demyelination in chronic galactose neuropathy.

Abstract:

:Dystrophic changes of Schwann cells and demyelination occurred in rats with chronic nerve edema induced by feeding a galactose-rich diet for two years. The mechanism for edema is the sorbitol pathway which generates osmotically active polyols from galactose or glucose. The blood-nerve barrier impedes diffusion of macromolecules from peripheral nerves, and endoneurial fluid pressure (EFP) becomes elevated. After 24-26 months of feeding with 40% galactose diet, myelinated nerve fibers showed segmental demyelination with bubbly disintegration of myelin sheaths, axonal degeneration, and remyelination. These pathologic changes were significantly more common than similar abnormalities in age-matched controls. Massive glycogen accumulation in Schwann cells, a unique morphologic finding, appeared only in experimental rats. Since edema and increased EFP are the earliest pathologic changes and are present for months before demonstrable nerve fiber injury, we suggest that they are responsible for the changes of myelinated fibers in chronic galactose neuropathy.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Powell HC,Myers RR

doi

10.1002/mus.880060309

subject

Has Abstract

pub_date

1983-03-01 00:00:00

pages

218-27

issue

3

eissn

0148-639X

issn

1097-4598

journal_volume

6

pub_type

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