NT-702 (parogrelil hydrochloride, NM-702), a novel and potent phosphodiesterase 3 inhibitor, suppress the asthmatic response in guinea pigs, with both bronchodilating and anti-inflammatory effects.
European Journal of Pharmacology(2009)
Abstract
We evaluated the effects of NT-702 (parogrelil hydrochloride, NM-702, 4-bromo-6-[3-(4-chlorophenyl) propoxy]-5-[(pyridine-3-ylmethyl) amino] pyridazin-3(2H)-one hydrochloride), a selective phosphodiesterase 3 inhibitor, on the asthmatic response in guinea pigs. NT-702 at a concentration of 1×10−7M elevated the cyclic adenosine monophosphate content in prostaglandin E2-treated guinea pig tracheal smooth muscle cells. Leukotriene (LT) D4- and histamine-induced contraction of isolated guinea pig tracheal strips was inhibited by NT-702, with EC50 values of 3.2×10−7 and 2.5×10−7M, respectively. In an in vivo study, NT-702 suppressed LTD4-induced bronchoconstriction and the ovalbumin-induced immediate asthmatic response in guinea pigs through its bronchodilating effect. Furthermore, NT-702 also suppressed the ovalbumin-induced late asthmatic response, airway hyperresponsiveness, and the accumulation of inflammatory cells in the bronchoalveolar lavage fluid. These results suggest that NT-702 has an anti-inflammatory effect as well as a bronchodilating effect and might be useful as a novel potent therapeutic agent for the treatment of bronchial asthma, a new type of agent with both a bronchodilating and an anti-inflammatory effect.
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Key words
NT-702,Phosphodiesterase 3 inhibitor,Immediate asthmatic response,Late asthmatic response,Airway hyperresponsiveness,Guinea pig
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