Publication details

P-glycoprotein inhibition by dibenzocyclooctadiene lignans from Schisandra chinensis

Authors

DRABINOVÁ Martina ČARNECKÁ Martina PÁCHNIKOVÁ Gabriela HUMPA Otakar SLANINOVÁ Iva SLANINA Jiří

Year of publication 2017
Type Conference abstract
MU Faculty or unit

Faculty of Medicine

Citation
Description The structural requirements for P-glycoprotein inhibition by dibenzocyclooctadiene lignans were studied. Altogether 15 structurally related lignans isolated from Schisandra chinensis or prepared by their modification were investigated, including three pairs of enantiomers. P-Glycoprotein inhibition was quantified using a doxorubicin accumulation assay in human promyelocytic leukemia HL60/MDR cells overexpressing P-glycoprotein. A preliminary quantitative structure-activity relationship analysis revealed three main structural features involved in P-glycoprotein inhibition: a 1,2,3-trimethoxy moiety, a 6-acyloxy group, and the absence of a 7-hydroxy group. The lignans restored the cytotoxic effect of doxorubicin in HL60/MDR cells and when combined with a subtoxic concentration of this compound increased the proportion of G2/M cells significantly, which is a usual response to treatment with this anticancer drug. The five most effective dibenzocyclooctadiene lignans found so far have met two of the three conditions; however, none of the lignans tested met all three structural prerequisites. The final structure-to-MDR reversing activity relationship has not been established due to a limited number of lignans.
Related projects: