title: Intercellular transfer of P-glycoprotein mediates acquired multidrug resistance in tumor cells.
abstract: The overexpression of P-glycoprotein (P-gp) causes resistance to chemotherapy in many tumor types. Here, we report intercellular transfer of functional P-gp from P-gp-positive to P-gp-negative cells in vitro and in vivo. The expression of acquired P-gp is transient in isolated cells but persists in the presence of P-gp-positive cells or under the selective pressure of colchicine. The intercellular transfer of functional P-gp occurs between different tumor cell types and results in increased drug resistance both in vitro and in vivo. Most importantly, the acquired resistance permits tumor cells to survive potentially toxic drug concentrations long enough to develop intrinsic P-gp-mediated resistance. P-gp transfer also occurs to putative components of tumor stroma, such as fibroblasts, raising the possibility that multidrug resistance could be conferred by resistant tumor cells to critical stromal elements within the tumor mass. This is the first report, to our knowledge, that a protein transferred between cells retains its function and confers a complex biologic property upon the recipient cell. These findings have important implications for proteomic analyses in tumor samples and resistance to cancer therapy.
authors.affiliation: Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA.
authors.forename: Andre
authors.initials: A
authors.lastname: Levchenko
authors.forename: Bipin M
authors.initials: BM
authors.lastname: Mehta
authors.forename: Xinle
authors.initials: X
authors.lastname: Niu
authors.forename: Grace
authors.initials: G
authors.lastname: Kang
authors.forename: Liliana
authors.initials: L
authors.lastname: Villafania
authors.forename: Denise
authors.initials: D
authors.lastname: Way
authors.forename: Dolores
authors.initials: D
authors.lastname: Polycarpe
authors.forename: Michel
authors.initials: M
authors.lastname: Sadelain
authors.forename: Steven M
authors.initials: SM
authors.lastname: Larson
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D045744:Cell Line, Tumor; D003078:Colchicine / Q000378:metabolism; D018432:Drug Resistance, Multiple; D019008:Drug Resistance, Neoplasm; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D009447:Neuroblastoma / Q000378:metabolism*; D021381:Protein Transport; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D011993:Recombinant Fusion Proteins; D003078:Colchicine