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“Indeed, levels and efflux of adenosine from brain slices are markedly increased by depolarizing agents , electrical stimulation, or glutamate (Shimizu et al., 1970ri: Huang et al., 1973: Pull and McIlwain, 1973; 1975; Huang and Daly, 1974).”
“Recently, ATP and adenosine were shown to modulate the frequency of giant depolarizing potentials and spontaneous postsynaptic potentials in the newborn rat hippocampus via P2X-subclass andenosine A1 and, presumably, ATP receptors [6, 7].”
“2 Adenosine dose dependently and reversibly inhibited ICa elicited by depolarizing voltage steps from a holding potential of ‐80 mV to potentials ranging from ‐30 to +20 mV. The mean (± s.e.m.)”
“The combination of adenosine with depolarizing agents showed an additive effect on the level of guanosine 3',5'-monophosphate indicating that adenosine increased the level of guanosine 3',5'-monophosphate by a different mechanism from the depolarization.”
“It has been proposed that electrical pulses and elevated levels of K+ ions and other ' depolarizing '' stimuli act to increase adenosine 3' , 5'-monophosphate (cyclic AMP) levels in brain tissue via release and subsequent action of adenosine.”