Abstract:
OBJECTIVE:The plasma level of soluble CD40 ligand (sCD40L), which induces pro-inflammatory and pro-atherogenic responses, is known to be elevated in atherosclerotic patients. In this study, we investigated the mechanism of sCD40L release from human platelets, focusing on the involvement of thromboxane (TX) A(2). METHODS:We measured sCD40L release and TXA(2) production induced by ristocetin, an activator of GPIb/IX/V, from human platelets in vitro. Moreover, plasma sCD40L and TXA(2) levels in the 10 patients with severe carotid artery stenosis who were not taking any anti-platelet medicines were measured and compared with those obtained from non-atherosclerotic controls. RESULTS:Ristocetin significantly promoted sCD40L release and TXA(2) generation from platelets in vitro. Aspirin and SC-560, a cyclooxygenase-1 inhibitor, suppressed the ristocetin-induced sCD40L release from platelets in parallel with TXA(2) production. Ozagrel, a TXA(2) synthase inhibitor and PTXA(2), a thromboxane receptor (TP) antagonist also suppressed sCD40L release. U46619, a TP agonist, reversed the suppressive effect of aspirin on sCD40L release. In vivo, plasma levels of sCD40L and TXA(2) in the patients were significantly higher than those in controls. Elevated plasma levels of TXA(2) and sCD40L in the patients were markedly diminished after 7 days of 100mg aspirin administration. CONCLUSION:These results strongly suggest that GPIb/IX/V activation induces sCD40L release via TXA(2) from human platelets, and that sCD40L release via TXA(2) generation from platelets in atherosclerotic patients are up-regulated.
journal_name
Atherosclerosisjournal_title
Atherosclerosisauthors
Enomoto Y,Adachi S,Matsushima-Nishiwaki R,Doi T,Niwa M,Akamatsu S,Tokuda H,Ogura S,Yoshimura S,Iwama T,Kozawa Odoi
10.1016/j.atherosclerosis.2009.10.024subject
Has Abstractpub_date
2010-04-01 00:00:00pages
415-21issue
2eissn
0021-9150issn
1879-1484pii
S0021-9150(09)00898-3journal_volume
209pub_type
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