Inhibition of adenosine 3',5'-cyclic monophosphate phosphodiesterase by lignan glucosides of Eucommia bark.

Abstract
Studies were conducted on adenosine 3'',5''-cyclic monophosphate (cyclic AMP) phosphodiesterase inhibition by lignan glucosides from bark of Eucommia ulmoides OLIV. (Eucommiaceae). Various lignan diglucosides, (+)-syringaresinol di-O-.beta.-D-glucopyranoside (1c). (+)-medioresinol di-O-.beta.-D-glucopyranoside (2c), (+)-pinoresinol di-O-.beta.-D-glucopyranoside (3c) and (+)-1-hydroxypinoresinol 4'',4''''-di-O-.beta.-D-glucopyranoside (4d), showed strong inhibitory activity. The structure inhibitory activity relationships of the aglycone and its glucosides are discussed. The order of inhibitory effect was diglucoside .gtoreq. aglycone > monoglucoside.