Abstract:
:P-selectin, an endothelial leukocyte adhesion receptor, is rapidly translocated to the cell surface upon release from storage granules called Weibel-Palade bodies and is also transcriptionally upregulated upon cytokine stimulation of endothelial cells (ECs). These two pathways of surface expression are coincident with the rapid and cytokine-inducible pathway of neutrophil adhesion to ECs. Constitutive P-selectin expression is largely absent in cultured murine brain microvascular EC (BMEC) monolayers, but interleukin-1beta and tumor necrosis factor-alpha stimulation for 4 hours leads to dramatic P-selectin upregulation. The functional relevance of differential P-selectin expression in these cells was examined by studying BMECs derived from wild-type mice and P-selectin-deficient mice. We show that P-selectin deficiency does not affect Weibel-Palade body formation or their release in response to short-acting agonists. However, in the absence of P-selectin, the brain endothelium is unable to support neutrophil adhesion after stimulation with these agonists, which may contribute to the immune privilege status of the brain. We show that P-selectin does play a major role in supporting neutrophil adhesion in the cytokine-induced pathway in BMECs in the context of other cytokine-inducible endothelial-leukocyte adhesion receptors, E-selectin, ICAM-1, and VCAM-1.
journal_name
Bloodjournal_title
Bloodauthors
Barkalow FJ,Goodman MJ,Gerritsen ME,Mayadas TNsubject
Has Abstractpub_date
1996-12-15 00:00:00pages
4585-93issue
12eissn
0006-4971issn
1528-0020journal_volume
88pub_type
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