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Functional role of endothelial alpha2-adrenoceptor in coronary circulation remains unclear. Clonidine, an agonist of alpha2-adrenoceptors, was reported to induce coronary vasodilatation via stimulation of endothelial alpha2-adrenoceptors or coronary vasoconstriction involving vascular smooth muscle alpha2-adrenoceptors. Moreover, H2 receptor-dependent responses to clonidine were described. Here, we...
Eosinophils accumulation in the airways and sustained eosinophil-derived cysteinyl leukotrienes production represent key elements of the inflammatory response seen in asthma.However,it is not known whether activated epithelial cells influence cysteinyl leukotrienes production by eosinophils from healthy valunteers.The aim of the present study was therefore to analyse the effects of interactions between...
Prostaglandin endoperoxide H2 (PGH2) is generated from arachidonic acid by either constitutive (COX-1) or inducible (COX-2) cyclooxygenases. In arterial wall PGH2 is converted by PGI2 synthase (PGI-S) to prostacyclin (PGI2), and in platelets by thromboxane synthase (TX-S) to thromboxane (TXA2). Other prostanoids as PGD2, PGF2alpha or PGE2 were believed to arise non-enzymatically from PGH2. Only recently,...
Induction of NOS-2 in macrophages and smooth muscles within vascular wall with concomittant suppression of endothelial NOS-3 activity is considered to be a hallmark of vascular inflammation that triggers atherogenesis. Accordingly, drugs designed to reverse these changes should not only support vaning function of NOS-3 but also suppress proinflammatory NO production by NOS-2. It means that using selective...
Nebivolol is a unique ß1-adrenoceptor antagonist which possesses peripheral vasodilator properties dependent on endothelial NO. Nebivolol-induced release of NO was attributed to its L stereoisomer and to its ability to stimulate endothelial ß2, ß3 adrenoceptors or 5-HT1A receptors. Here, in the isolated guinea pig heart we analysed coronary vasodilator potency of L- and D-nebivolol and a possible...
It has been observed that ticlopidine and clopidogrel show, apart from their delayed antiplatelet properties, an immediate and transient thombolytic action related to the ability of these thienopyridines to stimulate the secretory function of vascular endothelium. With the objective to construct new molecules with identical thombolytic potency but at a higher level, we carried out different structural...
Increased generation of reactive oxygen species contribute to endothelial dysfunction in atherosclerosis, hypertension and heart failure. Recently, it was suggested that bursts of superoxide anions may inactivate endothelial surface-bound enzymes such as angiotensin converting enzyme (ACE). Here, we tested effects of xanthine/xanthine oxidase-derived superoxide anions on vascular responses and ACE...
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