title: Reversion of multidrug resistance with polyalkylcyanoacrylate nanoparticles: towards a mechanism of action.
abstract: Polyalkylcyanoacrylate (PACA) nanoparticles loaded with doxorubicin allowed multidrug resistance to be overcome in vitro. However, increased cytotoxicity is not always correlated with an increased level of intracellular drug. Although we have previously shown that PACA nanoparticles are not endocytosed by tumour cells, we report here that a direct interaction between nanoparticles and cells is a necessary requirement for overcoming resistance. In addition, the results showed that the degradation products of PACA (mainly polycyanoacrylic acid) in the presence of doxorubicin are able to increase both accumulation and cytotoxicity, thus suggesting the formation of a doxorubicin-polycyanoacrylic acid ion pair. It is therefore concluded that resistance is overcome as a result of both the adsorption of nanoparticles to the cell surface and increased doxorubicin diffusion by the accumulation of an ion pair at the plasma membrane.
authors.affiliation: Centre d'Etudes Pharmaceutiques, URA CNRS 1218, Châtenay-Malabry.
authors.forename: A C
authors.initials: AC
authors.lastname: de Verdière
authors.forename: C
authors.initials: C
authors.lastname: Dubernet
authors.forename: F
authors.initials: F
authors.lastname: Némati
authors.forename: E
authors.initials: E
authors.lastname: Soma
authors.forename: M
authors.initials: M
authors.lastname: Appel
authors.forename: J
authors.initials: J
authors.lastname: Ferté
authors.forename: S
authors.initials: S
authors.lastname: Bernard
authors.forename: F
authors.initials: F
authors.lastname: Puisieux
authors.forename: P
authors.initials: P
authors.lastname: Couvreur
mesh_terms: D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000378:metabolism*; D002470:Cell Survival / Q000187:drug effects; D003487:Cyanoacrylates / Q000494:pharmacology*; D004317:Doxorubicin / Q000378:metabolism*; D004337:Drug Carriers; D018432:Drug Resistance, Multiple; D019008:Drug Resistance, Neoplasm; D004659:Enbucrilate; D007941:Leukemia P388 / Q000188:drug therapy / Q000378:metabolism*; D008863:Microspheres; D011108:Polymers / Q000494:pharmacology*; D013059:Spectrum Analysis, Raman; D014407:Tumor Cells, Cultured / Q000187:drug effects
chemical_list: D000903:Antibiotics, Antineoplastic; D003487:Cyanoacrylates; D004337:Drug Carriers; D011108:Polymers; C057532:polyisohexylcyanoacrylate; D004317:Doxorubicin; D004659:Enbucrilate