EHNA hydrochloride play roles in mediating diverse pharmacological responses, including antiviral, antitumour and antiarrhythmic effects. EHNA hydrochloride is a potent and selective dual inhibitor of cyclic nucleotide phosphodiesterase 2 (PDE2)(IC50=4 μM) and adenosine deaminase (ADA). EHNA hydrochloride exerts a concentration inhibition of the cGMP-stimulated PDE II (cGs-PDE)(IC50:0.8 μM (human), 2 μM (porcine myocardium)), but has smaller inhibitory effect on the unstimulated PDE2 activity.
Hcyb1 is a potent and specific inhibitor of phosphodiesterase 2 (PDE2). It exhibits a high degree of selectivity for inhibiting PDE2A with an IC50 value of 0.57 μM. In addition, Hcyb1 displays over 250-fold selectivity against other recombinant members of the PDE family. Moreover, its pharmacological actions include neuroprotective and antidepressant-like effects, which are believed to be mediated through the cAMP/cGMP-CREB-BDNF signaling pathway [1].
Quercetin 3-O-methyl ether is a potent phosphodiesterase (PDE)3/4 inhibitor, it has potential for treating asthma against ovalbumin-induced airway hyperresponsiveness.