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GAETANO GIAMMONA

FOLATE-TARGETED SUPRAMOLECULAR VESICULAR AGGREGATES BASED ON POLYASPARTYL-HYDRAZIDE COPOLYMERS FOR THE SELECTIVE DELIVERY OF ANTITUMORAL DRUGS

  • Autori: Licciardi, M.; Paolino, D.; Celia, C.; Giammona, G.; Cavallaro, G.; Fresta, M.
  • Anno di pubblicazione: 2010
  • Tipologia: Articolo in rivista (Articolo in rivista)
  • Parole Chiave: DRUG DELIVERY, POLYASPARTYLHYDRAZIDE, FOLATE
  • OA Link: http://hdl.handle.net/10447/53510

Abstract

Supramolecular vesicular aggregates (SVAs) have the advantage of combining the safe and biocompatible properties of colloidal vesicular carriers based on phospholipids with those of polymeric materials, i.e. polyaspartyl-hydrazide (PAHy) copolymers. To provide SVAs with a certain tumour selectivity, folate moieties were chemically conjugated to PAHy copolymers. Physicochemical properties (mean sizes, polydispersity index and zeta potential) of folate-targeted SVAs (FT-SVAs) loaded with gemcitabine were evaluated. The antiproliferative and anticancer activity of gemcitabine-loaded FT-SVAs was evaluated against two cancer cell lines, i.e. MCF-7 cells which over-express the folate receptor and the BxPC-3 cells, which do not over-express this receptor. Gemcitabine-loaded FT-SVAs showed a significantly (p < 0.001) greater and more specific in vitro anticancer activity with respect to both the free drug and the drug-loaded conventional liposomes or untargeted SVAs. Confocal microscopy, flowcytometry analysis and b-scintillation highlighted that FT-SVAswere able to interact with MCF-7 cells after just 3 h and to increase the amount internalization in cells over-expressing the folate receptor. The in vivo biodistribution and pharmacokinetic experiments showed that gemcitabine-loaded SVAs and FT-SVAs were removed from the circulatory system at a slower rate than the native drug and a prolonged gemcitabine plasma concentration was observed for up to 16 h. SVAswere accumulated mainly in the lungs, spleen and kidneys, while FT-SVAswere also up taken by brain. These interesting and stimulating results suggest the existence of a possible in vivo application of SVAs and encourage the use of folate as a targeting agent in anticancer therapy.