Endothelium‐mediated contraction by A3 adenosine receptor agonist and its relationship to COX‐1/COX‐2 in A3KO mouse aorta

Involvement of COX-1 in A3 adenosine receptor-mediated contraction through endothelium in mice aorta.

We investigated whether A(3) adenosine receptor (A(3)AR) is involved in endothelium-mediated contraction through cyclooxygenases (COXs) with the use of wild-type (WT) and A(3) knockout (A(3)KO) mice aorta. A(3)AR-selective agonist, Cl-IBMECA, produced a concentration-dependent contraction (EC(50): 2.9 +/- 0.2 x 10(-9) M) in WT mouse aorta with intact endothelium (+E) and negligible effects in A...

A3 adenosine receptor agonist potentiates natural killer cell activity.

Activation of the Gi-protein-coupled A3 adenosine receptor (A3AR) has been reported to be involved in the inhibition of tumor cell growth. A3AR is highly expressed in tumor cells whereas lower expression was noted in a variety of normal cells. Recently we showed that A3AR activation in melanoma cells resulted in growth inhibition via a direct anti-proliferative effect which entailed cell cycle ...

NADPH oxidase pathway is involved in aortic contraction induced by A3 adenosine receptor in mice.

The NADPH oxidase (Nox) subunits 1, 2 (gp91 phox), and 4 are the major sources for reactive oxygen species (ROS) in vascular tissues. In conditions such as ischemia-reperfusion and hypoxia, both ROS and adenosine are released, suggesting a possible interaction. Our aim in this study was to examine the A(3) adenosine receptor (A(3)AR)-induced vascular effects and its relation to ROS and Nox1, 2,...

Adenosine A3 Receptor and Cardioprotection

Ischemic injury to the myocardium is a leading cause of morbidity and mortality around the globe.1 It is worth remembering, however, that this insult to the heart emerged only in the last few centuries, an instant in time from an evolutionary perspective. Thus, any cardioprotective responses to ischemic injury undoubtedly evolved for an entirely different purpose. Beyond pure academic interest,...

a3 adenosine receptor agonist (ib-meca) induced apoptosis in ovcar3 ovary cancer cell line