Adenosine promotes regulation of corneal hydration through cyclic adenosine monophosphate.

Abstract

Adenosine increases net endothelial fluid transport through an increase in cAMP. The effects are mediated by stimulation of adenylyl cyclase through a G-protein coupled to an adenosine receptor, which is most probably of the A2 beta subtype. Results suggest that the regulation of corneal hydration by adenosine is more probably through stimulation of active transport than through a change in permeability, involving either transmembrane fluxes of Na+ or HCO3- or another step tightly coupled to these primary events in fluid movement.