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With single- and double-labeling immunofluorescence techniques, the distribution patterns and morphological characteristics of P2X(2)- and P2X(3)-immunoreactive nerve fiber terminals and neuronal bodies have been studied in the main circulatory system baroreceptors and the nodose and petrosal ganglia of rats. A high density of P2X(2)- and P2X(3)-immunoreactive nerve fiber terminals was detected in the carotid sinus. P2X(2)- and P2X(3)-immunoreactive nerve fiber terminals were also distributed widely in the aortic arch, atrium, vena cava, and ventricles. Almost all the P2X(2)-immunoreactive nerve fiber terminals were immunoreactive for P2X(3) receptors. P2X(2)- and P2X(3)-immunoreactive neuronal bodies were also detected in the nodose and petrosal ganglia, which are the sources of the P2X(2)- and P2X(3)-immunoreactive nerve terminals. P2X(2) and P2X(3) receptors were expressed in the same ganglionic neurons. These data indicate that extracellular ATP, via the homomeric P2X(2) and P2X(3) receptors, and heteromeric P2X(2/3) receptor in the sensory receptors of carotid sinus, aortic arch, atrium, and vena cava, may be involved in the regulation of systematic circulation blood pressure.

Expression of P2X2 and P2X3 receptors in the rat carotid sinus, aortic arch, vena cava, and heart, as well as petrosal and nodose ganglia