YM 976 is an inhibitor of PDE4 (phosphodiesterase 4) (IC50 = 2.2 nM), which is an enzyme responsible for hydrolyzing cyclic phosphodiesters in the secondary messenger molecule cAMP. This allows the secondary messenger to have a longer half life and thus increases the length and intensity of signal transduction.
Aoki et al (2000) A novel phosphodiesterase type 4 inhibitor, YM976 (4-(3-chlorophenyl)-1,7-diethylpyrido[2,3-d]pyrimidin-2(1H)-one), with little emetogenic activity. J.Pharmacol.Exp.Ther. 295 255. Aoki et al (2001) Studies on mechanisms of low emetogenicity of YM976, a novel phosphodiesterase type 4 inhibitor. J.Pharmacol.Exp.Ther. 298 1142. Moriuchi et al (2003) Relaxant effect of YM976, a novel phosphodiesterase 4 inhibitor, on bovine tracheal smooth muscle. Eur.J.Pharmacol. 470 57.
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