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Noninvasive molecular imaging reveals role of PAF in leukocyte‐endothelial interaction in LPS‐induced ocular vascular injury
Author(s) -
Garland Rebecca C.,
Sun Dawei,
Zandi Souska,
Xie Fang,
Faez Sepideh,
Tayyari Faryan,
Frimmel Sonja A. F.,
Schering Alexander,
Nakao Shintaro,
HafeziMoghadam Ali
Publication year - 2011
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fj.10-160051
Subject(s) - medicine
Uveitis is a systemic immune disease and a common cause of blindness. The eye is an ideal organ for light‐based imaging of molecular events underlying vascular and immune diseases. The phospholipid platelet‐activating factor (PAF) is an important mediator of inflammation, the action of which in endothelial and immune cells in vivo is not well understood. The purpose of this study was to investigate the role of PAF in endothelial injury in uveitis. Here, we use our recently introduced in vivo molecular imaging approach in combination with the PAF inhibitors WEB 2086 (WEB) and ginkgolide B (GB). The differential inhibitory effects of WEB and GB in reducing LPS‐induced endothelial injury in the choroid indicate an important role for PAF‐like lipids, which might not require the PAF receptor for their signaling. P‐selectin glycoprotein ligand‐1‐mediated rolling of mouse leukocytes on immobilized P‐selectin in our autoperfused microflow chamber assay revealed a significant reduction in rolling velocity on the cells’ contact with PAF. Rolling cells that came in contact with PAF rapidly assumed morphological signs of cell activation, indicating that activation during rolling does not require integrins. Our results show a key role for PAF in mediating endothelial and leukocyte activation in acute ocular inflammation. Our in vivo molecular imaging provides a detailed view of cellular and molecular events in the complex physiological setting.—Garland, R. C., Sun, D., Zandi, S., Xie, F., Faez, S., Tayyari, F., Frimmel, S. A. F., Schering, A., Nakao, S., Hafezi‐Moghadam, A. Noninvasive molecular imaging reveals role of PAF in leukocyte‐endothelial interaction in LPS‐induced ocular vascular injury. FASEB J. 25, 1284–1294 (2011). www.fasebj.org