ABSTRACT
Calluses from stems and leaves of Mandevilla velutina were grown in culture for 30,45 and 60 days. Thin-layer chromatography of ethyl acetate extracts of calluses from stems of M. velutina revealed the presence of 6 compounds. Two of them had RF values identical to those of the anti-bradykinin (BK) compounds MV8609 and MV8610 previously isolated from the natural plant. The ethyl acetate extract (20 to 80 microng/ml) from stem callus culture antagonized in a concentration-dependent and reversible manner contractions caused by BK (0.1-100 nM) in the isolated rat uterus. The extracts obtained from calluses cultured for 30,45 and 60 days were about 79-, 63-and 31-fold more potent, respectively, in antagonizing BK than the crude extract obtained from the rhizome of the plant