graded doses of adenosine ( 0.1-1.0 mg , i.a . ) and atp ( 0.1-1.0 mg i.a . ) administered 1 min prior to secretin ( 0.025 clinical units , i.a . ) increased a secretin-stimulated secretory volume dose-dependently , and the effects of adenosine and atp were reversed by pretreatments with theophylline ( 0.3 mg , i.a . ) .
C0001443
adenosine
C0001480
atp