| Assay Method Information | |
| | Inhibition Assay |
| Description: | The PDE 4 (phosphodiesterase IV) inhibiting effect of the compounds of the present invention was performed by the following method, which was modified assay method described in Biochemical. Pharmacol. 48(6), 1219-1223 (1994). (1) The active fraction of PDE 4 (phosphodiesterase IV) was obtained. That is, the livers obtained from three Balb/c mice (male, 12 weeks: obtainable from CLEA Japan, Inc.) were suspended with 30 mL of buffer solution B [20 mM of bis-tris, 5 mM of 2-mercaptoethnol, 2 mM of benzamidine, 2 mM of EDTA, 0.1 mM of 4-(2-aminoethyl)benzensulfonyl hydrochloride, 50 mM of sodium acetate; pH 6.5], then homogenized by Polytron homogenizer. The homogenate were centrifuged under 25,000xG for 10 minutes at 4 C. The supernatant was separated and thus obtained supernatant was further centrifuged under 100,000xG for 60 minutes at 4 ° C., and then filtrated with 0.2 um filter to obtain the soluble fraction. |
| Affinity data for this assay | |
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