Synthesis of dibenzocyclooctadiene lignans derivatives as P-glycoprotein inhibitors

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Title in English 53rd Advances in Organic, Bioorganic and Pharmaceutical Chemistry "Liblice 2018"
Authors

DRABINOVÁ Martina ČARNECKÁ Martina SLANINOVÁ Iva HUMPA Otakar SLANINA Jiří

Year of publication 2018
Type Conference abstract
MU Faculty or unit

Faculty of Medicine

Citation
Description In previous work, the structural requirements for P-glycoprotein inhibition by dibenzocyclooctadiene lignans were studied. P-Glycoprotein inhibition was quantified using flow cytometry doxorubicin accumulation assay in resistant human acute promyelocytic leukaemia cells overexpressing P-glycoprotein (HL60/MDR). 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. The five most effective dibenzocyclooctadiene lignans have met two of the three conditions; however, none of the 14 lignans tested fulfilled all three structural prerequisites.1 Our current work is directed towards a greater number of suitable lignans to gain a deeper insight into the structure-to-activity relationship and to obtain more effective inhibitors. The lignans isolated from Schisandra chinensis extracts are modified to increase the effectiveness of P-glycoprotein inhibition. The 7-hydroxy group, which decreases the activity of lignans, was modified by acetylation, dehydration and methylation. The acetylated derivatives of schizandrin and gomisin A were prepared.
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