Abstract
The expression of caveolin-1 and the related molecule endothelial nitric oxide synthase (eNOS) was analyzed in the sciatic nerves of Lewis rats with experimental autoimmune neuritis (EAN). Western blot analysis showed that caveolin-1 significantly increased in the sciatic nerves with EAN upon initiation of cell infiltration during the early and peak stages (days 10 and 14 post-immunization, p.i.) and declined thereafter. The pattern of eNOS expression over the course of EAN largely matched that of caveolin-1. Immunohistochemistry showed that in EAN lesions, intense caveolin-1 immunostaining occurred in ED1-positive macrophages as well as in vessels, while the caveolin-1 immunoreaction was reduced in Schwann cells in the inflammatory lesions. Consequently, we postulated that caveolin-1 expression increased in the sciatic nerves with EAN; this possibly mediated either molecular trafficking or nitric oxide generation partly through the activation of eNOS in vascular endothelial cells, as well as in inflammatory macrophages in EAN and/or cellular apoptosis of inflammatory cells.
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