New developments in lung endothelial heterogeneity: Von Willebrand factor, P-selectin, and the Weibel-Palade body.

Abstract:

:Quiescent pulmonary endothelium establishes an antithrombotic, anti-inflammatory surface that promotes blood flow. However, the endothelium rapidly responds to injury and inflammation by promoting thrombosis and enabling the directed transmigration of inflammatory cells, such as neutrophils, into the alveolar airspace. Although the endothelial cell signals responsible for establishing a prothrombotic surface are distinct from those responsible for recognizing circulating neutrophils, these processes are highly interrelated. Von Willebrand factor (VWF)-stimulated secretion plays an important role in thrombus formation, and P-selectin surface expression plays a key role in neutrophil binding necessary for transmigration. Both VWF and P-selectin are located within Weibel-Palade bodies in pulmonary arteries and arterioles, yet Weibel-Palade bodies are absent in capillaries. Despite the absence of the Weibel-Palade bodies, pulmonary capillaries express both VWF and P-selectin. The physiological and pathophysiological significance of these observations is unclear. In this review, we address some anatomical and physiological features that distinguish pulmonary artery, capillary, and vein endothelium. In addition, we review our current understanding regarding the stimulated secretion of VWF and P-selectin in pulmonary artery and capillary endothelium. This information is considered in the context of vasculitis and pneumonia, two pathophysiological processes to which the stimulated secretion of VWF and P-selectin contribute.

journal_name

Semin Thromb Hemost

authors

Ochoa CD,Wu S,Stevens T

doi

10.1055/s-0030-1253452

subject

Has Abstract

pub_date

2010-04-01 00:00:00

pages

301-8

issue

3

eissn

0094-6176

issn

1098-9064

journal_volume

36

pub_type

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