title: Lobeline, a piperidine alkaloid from Lobelia can reverse P-gp dependent multidrug resistance in tumor cells.
abstract: Multidrug resistance (MDR) can limit efficacy of chemotherapy. The best studied mechanism involves P-gp (P-glycoprotein) mediated drug efflux. This study focuses on MDR reversal agents from medicinal plants, which can interfere with P-gp. Rhodamine 123 accumulation assay and flow cytometry analysis were employed to screen for P-gp dependant efflux inhibitors. Lobeline, a piperidine alkaloid from Lobelia inflata and several other Lobelia species, inhibited P-gp activity. MDR reversal potential of lobeline could be demonstrated in cells treated with doxorubicin in that lobeline can sensitize resistant tumor cells at non-toxic concentrations. However, lobeline cannot block BCRP (Breast Cancer Resistance Protein) dependent mitoxantrone efflux. Lobeline could be a good candidate for the development of new MDR reversal agents.
authors.affiliation: University of Heidelberg, Institute of Pharmacy and Molecular Biotechnology, INF 364, 69120 Heidelberg, Germany.
authors.forename: Yonggang
authors.initials: Y
authors.lastname: Ma
authors.forename: Michael
authors.initials: M
authors.lastname: Wink
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000502:physiology*; D000970:Antineoplastic Agents / Q000494:pharmacology; D018938:Caco-2 Cells; D004317:Doxorubicin / Q000494:pharmacology; D018432:Drug Resistance, Multiple; D019008:Drug Resistance, Neoplasm; D005434:Flow Cytometry; D006801:Humans; D029746:Lobelia / Q000737:chemistry*; D008120:Lobeline / Q000494:pharmacology*; D008942:Mitoxantrone / Q000494:pharmacology; D020112:Rhodamine 123 / Q000378:metabolism
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000970:Antineoplastic Agents; D020112:Rhodamine 123; D004317:Doxorubicin; D008942:Mitoxantrone; D008120:Lobeline