title: PLGA:poloxamer blend micro- and nanoparticles as controlled release systems for synthetic proangiogenic factors.
abstract: Tissue engineering is one of the most promising research areas in bioregenerative medicine. However, the restoration of biological functionalities by implanting bioartificially engineered tissues is still highly limited because of their lack of vascular networks. The use of proangiogenic molecules delivered from a controlled release device is a promising strategy to induce tissue vascularization. Indeed, the controlled release system can enhance the therapeutic effect in vivo of many short half-life drugs, while circumventing the need for repeated administrations. In this work, PLGA:poloxamer blend based micro- and nanoparticles have been developed for the sustained delivery of a recently developed synthetic proangiogenic compound: SHA-2-22. Drug-loaded PLGA:poloxamer blend microparticles were prepared by an oil-in-oil solvent extraction/evaporation technique. Drug-loaded PLGA:poloxamer nanoparticles were prepared by a modified solvent diffusion technique. These drug carriers were characterized with regard to their physicochemical properties, morphology, drug encapsulation efficiency and release kinetics in vitro. The results show that by adjusting the formulation conditions, it is possible to obtain PLGA:poloxamer micro- and nanoparticles with very high drug loadings, and with the capacity to release the active compound in a controlled way for up to one month. In vitro cell assays performed in an endothelial cell model confirmed the bioactivity of SHA-22-2 encapsulated in PLGA:poloxamer microparticles.
authors.affiliation: Department of Pharmacy and Pharmaceutical Technology, School of Pharmacy, University of Santiago de Compostela, Spain.
authors.forename: Yolanda
authors.initials: Y
authors.lastname: Parajó
authors.forename: Ivana
authors.initials: I
authors.lastname: d'Angelo
authors.forename: Aniko
authors.initials: A
authors.lastname: Horváth
authors.forename: Tibor
authors.initials: T
authors.lastname: Vantus
authors.forename: Kéri
authors.initials: K
authors.lastname: György
authors.forename: Alexander
authors.initials: A
authors.lastname: Welle
authors.forename: Marcos
authors.initials: M
authors.lastname: Garcia-Fuentes
authors.forename: Maria Jose
authors.initials: MJ
authors.lastname: Alonso
mesh_terms: D043925:Angiogenesis Inducing Agents / Q000008:administration & dosage / Q000737:chemistry*; D000818:Animals; D001672:Biocompatible Materials / Q000737:chemistry*; D002417:Cattle; D002460:Cell Line; D002626:Chemistry, Pharmaceutical; D003692:Delayed-Action Preparations / Q000737:chemistry; D004337:Drug Carriers / Q000737:chemistry; D016503:Drug Delivery Systems; D004730:Endothelium, Vascular / Q000187:drug effects; D019344:Lactic Acid / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry; D018919:Neovascularization, Physiologic / Q000187:drug effects; D010316:Particle Size; D020442:Poloxamer / Q000737:chemistry*; D011100:Polyglycolic Acid / Q000737:chemistry*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D023822:Tissue Engineering
chemical_list: D043925:Angiogenesis Inducing Agents; D001672:Biocompatible Materials; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D020442:Poloxamer; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid