Brain endothelium lack one of two pathways of P-selectin-mediated neutrophil adhesion.
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.[1]References
- Brain endothelium lack one of two pathways of P-selectin-mediated neutrophil adhesion. Barkalow, F.J., Goodman, M.J., Gerritsen, M.E., Mayadas, T.N. Blood (1996) [Pubmed]
Annotations and hyperlinks in this abstract are from individual authors of WikiGenes or automatically generated by the WikiGenes Data Mining Engine. The abstract is from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.About WikiGenesOpen Access LicencePrivacy PolicyTerms of Useapsburg
