treatment of l1210 cells with glucose , 1-methyl-3-isobutylxanthine , theophylline , and prostaglandins e1 and e2 was used to increase to varying degrees the endogenous level of cyclic adenosine 3':5'-monophosphate ( camp ) .
C0000096
1-methyl-3-isobutylxanthine
C0039771
theophylline