title: Down-regulation of P-glycoprotein expression in MDR breast cancer cell MCF-7/ADR by honokiol.
abstract: P-glycoprotein accounts for the most intrinsic and acquired cancer multidrug resistance. To inhibit the expression of P-glycoprotein is one of the effective ways to reverse cancer drug resistance. Honokiol, a naturally occurring compound, has been demonstrated to combat cancer through mechanisms including inhibition of angiogenesis and induction of apoptosis. Here, we show that honokiol down-regulated the expression of P-glycoprotein at mRNA and protein levels in MCF-7/ADR, a human breast MDR cancer cell line. The down-regulation of P-glycoprotein was accompanied with a partial recovery of the intracellular drug accumulation, and of the sensitivities toward adriamycin. This study reveals a novel function of honokiol as an anti-cancer agent.
authors.affiliation: Cancer Institute, The Second Affiliated Hospital, The Medical School, Zhejiang University, 88 Jiefang Road, Hangzhou, Zhejiang Province 310009, People's Republic of China.
authors.forename: Dong
authors.initials: D
authors.lastname: Xu
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Lu
authors.forename: Xun
authors.initials: X
authors.lastname: Hu
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics* / Q000378:metabolism; D000903:Antibiotics, Antineoplastic / Q000494:pharmacology; D001713:Biphenyl Compounds / Q000494:pharmacology*; D001943:Breast Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D015536:Down-Regulation / Q000187:drug effects / Q000235:genetics; D004317:Doxorubicin / Q000494:pharmacology*; D018432:Drug Resistance, Multiple / Q000235:genetics; D019008:Drug Resistance, Neoplasm / Q000235:genetics; D004357:Drug Synergism; D004365:Drugs, Chinese Herbal / Q000494:pharmacology; D005434:Flow Cytometry; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects*; D006801:Humans; D017705:Lignans / Q000494:pharmacology*; D031566:Magnolia / Q000737:chemistry; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020112:Rhodamine 123 / Q000378:metabolism; D013997:Time Factors; D000498:Allyl Compounds; D010636:Phenols
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000903:Antibiotics, Antineoplastic; D001713:Biphenyl Compounds; D004317:Doxorubicin; D004365:Drugs, Chinese Herbal; D017705:Lignans; D012333:RNA, Messenger; D020112:Rhodamine 123; C005499:honokiol; D000498:Allyl Compounds; D010636:Phenols