Abstract:
:Aspirin and clopidogrel are used therapeutically for their anti-platelet effects. We examined the effects of aspirin and clopidogrel on basal and beta-adrenoceptor (beta-AR)-mediated platelet nitric oxide (NO) synthesis in healthy subjects and patients with coronary heart disease (CHD). Healthy subjects (n=19) were randomized in a double-blind cross-over manner to receive aspirin or clopidogrel, each at 75 mg daily, for 14 days. Patients (n=17) of similar age with CHD, taking aspirin, were randomized double-blind to either continue on aspirin 75 mg daily or to receive clopidogrel 75 mg daily for 14 days. NO synthase (NOS) activity was measured from l-[(3)H]arginine to l-[(3)H]citrulline conversion, and cGMP was determined by radioimmunoassay, in platelets basally and following incubation with isoproterenol or albuterol (each at 10(-5) mol/L). In healthy subjects, aspirin did not affect basal NOS activity or cGMP in platelets, but suppressed the normal increase in both by isoproterenol and albuterol. Clopidogrel suppressed platelet NOS activity and cGMP both basally and in response to beta-AR agonists. In platelets from CHD patients, clopidogrel suppressed basal and beta-AR-stimulated NOS activity and cGMP as compared with aspirin. Platelet NOS activity and cGMP were lower in CHD subjects pre-randomization compared with healthy subjects both pre-randomization and post-aspirin. We conclude that chronic aspirin treatment suppresses beta-AR-stimulated but not basal platelet NO synthesis, as previously described, whereas chronic clopidogrel treatment suppresses both, with resultant functional consequences. Moreover, CHD may itself be associated with decreased platelet NO biosynthesis.
journal_name
J Mol Cell Cardioljournal_title
Journal of molecular and cellular cardiologyauthors
O'Kane PD,Reebye V,Ji Y,Stratton P,Jackson G,Ferro Adoi
10.1016/j.yjmcc.2008.05.015subject
Has Abstractpub_date
2008-08-01 00:00:00pages
223-9issue
2eissn
0022-2828issn
1095-8584pii
S0022-2828(08)00452-5journal_volume
45pub_type
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