P-glycoprotein inhibition by dibenzocyclooctadiene lignans from Schisandra chinensis
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| Year of publication | 2017 |
| Type | Conference abstract |
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| 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. |
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