Phosphatidylcholine hydroperoxide-induced THP-1 cell adhesion to intracellular adhesion molecule-1.
The accumulation of phosphatidylcholine hydroperoxide (PCOOH), a primary oxidation product of phosphatidylcholine (PC), in blood plasma and tissues has been observed in various pathological conditions, including atherosclerosis. However, the biological roles of PCOOH in these conditions remain unknown. To estimate the atherogenicity of PCOOH, we evaluated the effect of PCOOH on THP-1 monocytic cell adherence to immobilized vascular endothelial cell adhesion molecules. THP-1 cell adhesion to intracellular adhesion molecule-1 (ICAM-1) was dose-dependently increased by addition of PCOOH. Phosphatidylcholine hydroxide (a hydroxyl analog of PCOOH) also induced THP-1 cell adhesion to ICAM-1, whereas nonoxidized PC, sn-2 truncated PCs, and other hydroperoxide compounds did not affect the adhesion. In the PCOOH-treated cells, obvious protruding F-actin-rich membrane structures were formed, and lymphocyte function-associated antigen-1 (LFA-1) was localized to the protruding structures. Cytochalasin D, an actin polymerization inhibitor, suppressed the PCOOH-induced cell adhesion to ICAM-1 and the membrane protrusions. These results indicate that PCOOH evokes LFA-1-mediated cell adhesion to ICAM-1 via actin cytoskeletal organization, and the mechanism may participate in monocyte adherence to the arterial wall in the initiation of atherosclerosis.
Asai
Akira
A
Department of Medicine, Division of Endocrinology and Metabolism, Nippon Medical School, Tokyo, Japan.
Okajima
Fumitaka
F
Nakagawa
Kiyotaka
K
Ibusuki
Daigo
D
Tanimura
Kyoko
K
Nakajima
Yasushi
Y
Nagao
Mototsugu
M
Sudo
Mariko
M
Harada
Taro
T
Miyazawa
Teruo
T
Oikawa
Shinichi
S
D000199:Actins / Q000378:metabolism; D015703:Antigens, CD / Q000378:metabolism; D002448:Cell Adhesion / Q000187:drug effects*; D002460:Cell Line; D022081:Cell Surface Extensions / Q000378:metabolism; D015638:Cytochalasin D / Q000378:metabolism; D003599:Cytoskeleton / Q000378:metabolism; D042783:Endothelial Cells / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D006801:Humans; D018799:Intercellular Adhesion Molecule-1 / Q000235:genetics / Q000378:metabolism*; D016169:Lymphocyte Function-Associated Antigen-1 / Q000378:metabolism; D009000:Monocytes / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D019384:Nucleic Acid Synthesis Inhibitors / Q000378:metabolism; D010084:Oxidation-Reduction; D010713:Phosphatidylcholines / Q000494:pharmacology*; D017382:Reactive Oxygen Species / Q000378:metabolism
D000199:Actins; D015703:Antigens, CD; D016169:Lymphocyte Function-Associated Antigen-1; D019384:Nucleic Acid Synthesis Inhibitors; D010713:Phosphatidylcholines; D017382:Reactive Oxygen Species; C057590:phosphatidylcholine hydroperoxide; D018799:Intercellular Adhesion Molecule-1; D015638:Cytochalasin D