Effect of estrogen on the expression of occludin in ovariectomized mouse brain.

Abstract:

:The blood-brain barrier (BBB) and blood-cerebrospinal fluid barrier (BCSFB), formed by interactions of tight junctions (TJs) in the endothelia or the choroids plexus, respectively, are important diffusion barriers between systemic circulation and neural tissue of the central nervous system (CNS). Epidemiological incidence of degenerative changes in the CNS is significantly higher in postmenopausal women than in men, suggesting an important role of ovarian steroids for CNS integrity in women. To elucidate the role estrogen in the maintenance of paracellular diffusion barriers in the CNS, changes in the expression of occludin, a TJ protein, following ovariectomy (OVX), as well as the effect of estrogen on the expression of occludin in OVX female brain, were examined in mice. Immunoreactivity of occludin was found in brain endothelial capillaries, choroids plexus, ependyma, and aqueduct. In OVX brain, expression of occludin mRNA and protein was decreased a little but significantly relative to a sham control brain at the estrous stage. Estrogen (17beta estradiol) significantly up-regulated occludin mRNA levels in OVX mice. Together, these results suggest that occludin is an important structural element in both the BBB and BCSFB, and that expression of occludin in female brain tissue is sensitive to estrogen levels.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Kang HS,Ahn HS,Kang HJ,Gye MC

doi

10.1016/j.neulet.2006.03.052

subject

Has Abstract

pub_date

2006-07-10 00:00:00

pages

30-4

issue

1-2

eissn

0304-3940

issn

1872-7972

pii

S0304-3940(06)00319-3

journal_volume

402

pub_type

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