[$^{3}$H]Adenosine Triphosphate: Release during Stimulation of Enteric Nerves

The isolated taenia coli of the guinea pig takes up tritiated adenosine, adenosine monophosphate, adenosine diphosphate, and adenosine triphosphate, in preference to tritiated inosine and adenine. After uptake, [$^{3}$H]adenosine is converted and retained primarily as [$^{3}$H]adenosine triphosphate. Tritium is released from taenia coli treated with [$^{3}$H]adenosine upon activation of the nonadrenergic inhibitory nerves. These results are consistent with the previous evidence that adenosine triphosphate may be the transmitter from the nerves.