3-O-Methylquercetin可抑制总 cAMP 和cGMP-phosphodiesterase (PDE)。它对PDE1、PDE5、PDE 和PDE4的IC50分别是31.9 μM、86.9 μM、18.6 μM 和1.6 μM。 生化/生理作用 3-O-甲基槲皮素能显著抑制环状单磷酸腺苷（cAMP-）和环状单磷酸鸟苷（cGMP-）磷酸二酯酶活性。它具有抗炎、抗支气管扩张的特性，可用于治疗哮喘。它抑制总的炎症细胞、肿瘤坏死因子-α（TNF-α），并减弱白介素的产生。 3-O-甲基槲皮素是黄酮和黄酮生物合成中的代谢产物，具有强大的抗癌、抗氧化、抗过敏和抗微生物活性，对番茄环斑病毒具有很强的抗病毒活性。 Biochem/physiol Actions 3-O-Methylquercetin significantly inhibits cyclic adenosine monophosphate- (cAMP-) and cyclic guanosine monophosphate- (cGMP-) phosphodiesterase activity. It possess anti-inflammatory, bronchodilating properties and used in treatment of asthma. It suppresses the total inflammatory cells, tumor necrosis factor-α (TNF-α) and attenuates the production of interleukins. 3-O-Methylquercetin is a metabolite in flavone and flavonol biosynthesis.It was shown to have potent anticancer-promoting, antioxidant, antiallergy, and antimicrobial activity[6], and showed strong anti-viral activity inhibition of tomato ringspot virus.