title: Effects of immobilization by entrapment in alginate and scale-up on paclitaxel and baccatin III production in cell suspension cultures of Taxus baccata.
abstract: Paclitaxel and baccatin III-producing cells of Taxus baccata were immobilized within Ca(2+)-alginate beads. Under established optimum conditions for the biosynthesis of both taxanes, the yields of paclitaxel and baccatin III in shake-flask cultures of free cells increased by factors of up to 3 and 2, respectively, in the corresponding cultures of immobilized cells. Although the scale-up from shake-flask to bioreactor culture usually results in reduced productivities when both free and immobilized cells were grown in the same optimum conditions in three different bioreactor types (Stirred, Airlift, and Wave) running for 24 days in a batch mode and with the system optimized in each case, there was a considerable increase in the yields of paclitaxel and baccatin III. Among the reactors, the Stirred bioreactor was the most efficient in promoting immobilized cell production of paclitaxel, giving a content of 43.43 mg.L(-1) at 16 days of culture, equivalent to a rate of 2.71 mg.L(-1).day(-1). To our knowledge, the paclitaxel productivity obtained in this study is one of the highest reported so far by academic laboratories for Taxus species cultures in bioreactors.
authors.affiliation: Laboratorio de Fisiologia Vegetal, Facultad de Farmacia, Universidad de Barcelona, Avda. Diagonal 643, 08028 Barcelona, Spain.
authors.forename: Salima
authors.initials: S
authors.lastname: Bentebibel
authors.forename: Elisabet
authors.initials: E
authors.lastname: Moyano
authors.forename: Javier
authors.initials: J
authors.lastname: Palazón
authors.forename: Rosa M
authors.initials: RM
authors.lastname: Cusidó
authors.forename: Mercedes
authors.initials: M
authors.lastname: Bonfill
authors.forename: Regine
authors.initials: R
authors.lastname: Eibl
authors.forename: M Teresa
authors.initials: MT
authors.lastname: Piñol
mesh_terms: D000464:Alginates / Q000494:pharmacology*; D000470:Alkaloids / Q000032:analysis / Q000096:biosynthesis*; D000972:Antineoplastic Agents, Phytogenic / Q000096:biosynthesis*; D018533:Biomass; D019149:Bioreactors; D001709:Biotechnology; D002478:Cells, Cultured; D020723:Glucuronic Acid / Q000494:pharmacology*; D006603:Hexuronic Acids / Q000494:pharmacology*; D017239:Paclitaxel / Q000032:analysis / Q000096:biosynthesis*; D043823:Taxoids / Q000032:analysis; D020946:Taxus / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism
chemical_list: D000464:Alginates; D000470:Alkaloids; D000972:Antineoplastic Agents, Phytogenic; D006603:Hexuronic Acids; D043823:Taxoids; C073950:baccatin III; D020723:Glucuronic Acid; D017239:Paclitaxel