Induction of sialyl Lewis(X) on the surface of cultured rat vascular endothelial cells and cardiac myocytes by hypoxia/reoxygenation in vitro.
Neutrophils adhere to and roll on vascular endothelial cells (VECs) through interaction of selections and their carbohydrate ligands in the early stages of inflammation; this adhesion is then later strengthened through interaction of integrins on neutrophils with intercellular adhesion molecule-1 (ICAM-1) on endothelial cells. Recent, as yet unpublished studies showed that myocardial ischaemia/reperfusion caused rapid expression of sialyl Lewis(X) (SLe(X)), one of the carbohydrate ligands of selections, on VECs and cardiac myocytes and that an anti-SLe(X) monoclonal antibody (MAb) significantly reduced myocardial reperfusion injury in vivo, In the present study, to investigate whether or not ischaemia/reperfusion itself can induce the expression of SLe(X) on VECs and cardiac myocytes, the expression of SLe(X) on cultured rat VECs and cardiac myocytes was examined by treatment with hypoxia/reoxygenation in vitro, because ischaemia/ reperfusion stimuli may partly be due to hypoxia/reoxygenation. The expression of SLe(X) was induced rapidly and temporarily on the surface of cultured rat cardiac myocytes and VECs by hypoxia/reoxygenation in vitro. This strongly suggests that the expression of SLeX on the surface of myocardial cells is induced initially and directly by ischaemia/reperfusion, which results in the rolling attachment of neutrophils in the early stages of myocardial reperfusion injury.
Seko
Y
Y
Third Department of Internal Medicine, Faculty of Medicine, University of Tokyo, Japan.
Enokawa
Y
Y
Tamatani
T
T
Kannagi
R
R
Yagita
H
H
Okumura
K
K
Yazaki
Y
Y
D000818:Animals; D018929:Cell Culture Techniques; D015687:Cell Hypoxia / Q000502:physiology; D004730:Endothelium, Vascular / Q000187:drug effects / Q000378:metabolism*; D006321:Heart / Q000187:drug effects; D007124:Immunoenzyme Techniques; D007700:Kinetics; D015428:Myocardial Reperfusion Injury / Q000378:metabolism*; D009206:Myocardium / Q000378:metabolism*; D009844:Oligosaccharides / Q000378:metabolism*; D010100:Oxygen / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D000080506:Sialyl Lewis X Antigen
D009844:Oligosaccharides; D000080506:Sialyl Lewis X Antigen; D010100:Oxygen