Theophylline is a drug that can be used to raise this compound's serum levels because it inhibits the phosphodiesterases that participate in this compound's breakdown.  
Theophylline is a drug that can be used to raise this compound's serum levels because it inhibits the phosphodiesterases that participate in this compound's breakdown.  Its formation is driven by the hydrolysis of pyrophosphate to phosphate and only occurs with the presence of an adenylate cyclase.  It works by activating Protein kinase A, and is itself activated by the binding of a hormone to a cell receptor.  G proteins perform similar functions as does calcium to a certain extent.  FTP, name this foremost of the body's second messengers, a derivative of ATP.
Theophylline is a drug that can be used to raise this compound's serum levels because it inhibits the phosphodiesterases that participate in this compound's breakdown.  
cyclic AMP or cyclic adenosine monophosphate or c-AMP