title: In vitro and in vivo anti-tumor effects of novel Span 80 vesicles containing immobilized Eucheuma serra agglutinin.
abstract: The lectin Eucheuma serra agglutinin (ESA) is known from previous studies to specifically bind to high-mannose type N-glycans and to induce apoptotic cancer cell death in vitro. In this study, Span 80 vesicles, with an average diameter between about 200 and 400 nm, containing immobilized ESA were prepared from the nonionic surfactant Span 80, also known as sorbitan monooleate. The vesicles were investigated in vitro and in vivo to evaluate the vesicles's potential applicability as novel drug delivery system. The results obtained are promising since the following was observed: (i) vesicular ESA had the same hemagglutinating activity as free ESA, demonstrating its biological activity when bound to the vesicles; (ii) vesicles containing immobilized ESA decreased the viability of Colo201 cancer cells in vitro while the growth of normal cells was not affected; (iii) the vesicles showed binding to Colo201 cells in vitro and caused inhibition of cancer cell growth in nude mice to which the vesicle-treated cells were added; (iv) the vesicles diminished tumor growth after intravenous administration to nude mice which contained an implanted Colo201 tumor; (v) the vesicles showed a tendency to accumulate at the site of the tumor 6h after i.v. administration to nude mice. Thus, all measurements carried out indicate that this type of Span 80 vesicle can be considered as promising alternatives to conventional phospholipid-based vesicles.
authors.affiliation: Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan.
authors.forename: Yousuke
authors.initials: Y
authors.lastname: Omokawa
authors.forename: Tatsuhiko
authors.initials: T
authors.lastname: Miyazaki
authors.forename: Peter
authors.initials: P
authors.lastname: Walde
authors.forename: Koichi
authors.initials: K
authors.lastname: Akiyama
authors.forename: Takuya
authors.initials: T
authors.lastname: Sugahara
authors.forename: Seizo
authors.initials: S
authors.lastname: Masuda
authors.forename: Akihiro
authors.initials: A
authors.lastname: Inada
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Ohnishi
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Saeki
authors.forename: Keiichi
authors.initials: K
authors.lastname: Kato
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000008:administration & dosage / Q000302:isolation & purification / Q000494:pharmacology*; D045744:Cell Line, Tumor; D003110:Colonic Neoplasms / Q000188:drug therapy; D016503:Drug Delivery Systems; D004354:Drug Screening Assays, Antitumor; D005260:Female; D006386:Hemagglutination Tests; D006601:Hexoses / Q000737:chemistry*; D006801:Humans; D037102:Lectins / Q000008:administration & dosage / Q000302:isolation & purification / Q000494:pharmacology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D010316:Particle Size; D000461:Rhodophyta / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry
chemical_list: D000970:Antineoplastic Agents; D006601:Hexoses; D037102:Lectins; D013501:Surface-Active Agents; C018665:sorbitan monooleate