Neutrophil degranulation is an important event in inflammatory responses. We examined the regulation of neutrophil (PMN) degranulation by resting and activated @entity1 endothelial cells. Whereas PMNs adherent to endothelial cells that were stimulated to express @entity8729 and platelet-activating factor did not release the specific granule marker lactoferrin or the primary granule enzyme, elastase, PMNs adherent to endothelial cells stimulated with interleukin-1 ( @entity1192 ) or @entity5 necrosis factor secreted both. PMN degranulation was dependent on the time of incubation of endothelial cells with the cytokine, its concentration, and the time of incubation of the PMNs with endothelial cells. Degranulation of PMNs and their adhesion to stimulated endothelial cells are correlated events, but they could be dissociated by blocking the tethering molecules used by the endothelial cells and neutrophils under these conditions. This suggested that paracrine signaling molecules that induce PMN degranulation are produced by cytokine-stimulated endothelial cells. We found that endothelial cells stimulated with @entity1192 release newly synthesized degranulating factors that require transcription and translation. @entity687 was synthesized, released, and signaled granular secretion by PMNs. However, experiments with blocking antibodies indicated the presence of an additional degranulating factor not accounted for by @entity687 . These experiments demonstrate that @entity1 endothelial cells regulate degranulation of neutrophils by generating signaling factors that are expressed differentially depending on the endothelial agonist and other features. Active modification of neutrophil granular secretion by endothelial cells can influence physiologic acute inflammatory responses but may also contribute to pathologic vascular and tissue damage.

XXXX endothelial cells regulate polymorphonuclear leukocyte degranulation.

@entity1 :: ('9606', 'Species') :: ['human'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor'] @entity8729 :: ('6403', 'Gene') :: ['P-selectin'] @entity1192 :: ('3552', 'Gene') :: ['IL-1'] @entity687 :: ('3576', 'Gene') :: ['IL-8']
@entity1 :: (9606,Species) :: ['Human']
