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. 1968 Sep 1;128(3):469–495. doi: 10.1084/jem.128.3.469

THE INITIAL LESION IN EXPERIMENTAL ALLERGIC NEURITIS

A PHASE AND ELECTRON MICROSCOPIC STUDY

Karl E Åström 1, Henry de F Webster 1, Barry G Arnason 1
PMCID: PMC2138533  PMID: 4875326

Abstract

Experimental allergic neuritis (EAN) was produced in rats by the intradermal injection of an emulsion of peripheral nerve in Freund's adjuvant. Early lesions in perfused sciatic nerves were studied by phase, light, and electron microscopy at intervals up to 15 days following immunization. Circulating lymphocytes attached focally to the inner surface of blood vessels, primarily venules, to initiate parenchymal lesion formation. Attached cells had the hand mirror configuration typical of the motile lymphocyte. They subsequently flattened against the endothelial surface and then traversed the vascular wall by sinking into and passing through the cytoplasm of endothelial cells. The transgressor and transgressed cell membranes were intact and both cells retained their integrity. Lymphocytes began to transform and divide intravascularly; these events accelerated extravascularly. Although the migrating cells became larger and more pleomorphic in the perivascular regions, their essential character was in keeping with an origin from circulating lymphocytes. In many lesions, there was fluid with protein, possibly produced by the transformed extravascular cells. The described cellular events precede tissue damage and are likely instrumental in the myelin destruction which follows

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Selected References

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