Pyridazine derivatives act as phosphodiesterase-III, IV, and V Inhibitors

Pyridazine derivatives are significant bioactive molecules having wide range of biological activities. Phosphodiesterase (PDE) enzymes, particularly PDE-III, PDE-IV, and PDE-V are inhibited by some pyridazine compounds. PDEs are cyclic nucleotide-hydrolyzing enzymes that regulate intracellular levels of the secondary messengers (cAMP and cGMP), cell activities and their specific inhibitory effects for the treatment of various disorders. PDE isoenzyme selective inhibitors include PDE-III inhibitors for congestive heart failure (CHF), PDE-IV inhibitors for inflammatory disorders, and PDE-V inhibitors for erectile dysfunction. The PDE-V inhibitor should be utilized in pulmonary hypertension. In this article, study the PDE activities of various pyridazine compounds were investigated.