title: Combination material delivery of dexamethasone and growth factor in hydrogel blended with hyaluronic acid constructs for neocartilage formation.
abstract: The aim of this study was to assess the efficacy of poly(NiPAAm-co-AAc) blended with hyaluronic acid (HA) as an injectable cell vehicle and a cell therapeutic agent in the form of a supporting matrix for the chondrogenic differentiation of rabbit chondrocytes. Specially, rabbit chondrocytes were embedded in blended hydrogels co-encapsulation with dexamethasone (Dex) and growth factors for enhancing the chondrogenic differentiation. Blended hydrogel constructs consisting of embedded cells co-encapsulating Dex and TGF beta-3 or unloaded Dex and sTGF beta-3 served as controls to assess the effects of Dex on chondrogenic differentiation. Hydrogel constructs consisting of embedded cells co-encapsulating Dex and TGF beta-3 on chondrogenic differentiation. The hydrogel constructs were injected subcutaneously into the nude mice and monitored for 1, 4, and 8 weeks after the injection. The level of the cartilage-associated ECM proteins was determined by immunohistochemical (collagen type II; specific marker for chondrogenic differentiation), Safranin-O, and Alcian blue (GAG) staining. Over the same time period, the glycosamingoglycan content per cell remained constant for all formulations, indicating that the dramatic increase in cell number for samples with Dex and TGF beta-3 loaded in hydrogel constructs was accompanied by maintenance of the cell phenotypes.
authors.affiliation: Division of Biotechnology, The Catholic University of Korea, 43-1 Yokkok2-dong, Wonmi-gu, Bucheon 420-743, Korea.
authors.forename: Kun
authors.initials: K
authors.lastname: Na
authors.forename: Sungwon
authors.initials: S
authors.lastname: Kim
authors.forename: Dae Gyun
authors.initials: DG
authors.lastname: Woo
authors.forename: Bo Kyung
authors.initials: BK
authors.lastname: Sun
authors.forename: Han Na
authors.initials: HN
authors.lastname: Yang
authors.forename: Hyung-Min
authors.initials: HM
authors.lastname: Chung
authors.forename: Keun-Hong
authors.initials: KH
authors.lastname: Park
mesh_terms: D000818:Animals; D000943:Antigens, Differentiation; D002356:Cartilage / Q000166:cytology / Q000378:metabolism; D002454:Cell Differentiation / Q000187:drug effects; D019902:Chondrocytes / Q000166:cytology / Q000378:metabolism* / Q000637:transplantation; D024043:Collagen Type II; D003692:Delayed-Action Preparations / Q000737:chemistry; D003907:Dexamethasone / Q000737:chemistry / Q000494:pharmacology*; D005938:Glucocorticoids / Q000737:chemistry / Q000494:pharmacology*; D006820:Hyaluronic Acid / Q000737:chemistry; D020100:Hydrogels / Q000737:chemistry; D008422:Materials Testing; D051379:Mice; D008819:Mice, Nude; D011817:Rabbits; D023822:Tissue Engineering; D054457:Tissue Scaffolds / Q000737:chemistry; D053782:Transforming Growth Factor beta3 / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D000943:Antigens, Differentiation; D024043:Collagen Type II; D003692:Delayed-Action Preparations; D005938:Glucocorticoids; D020100:Hydrogels; D053782:Transforming Growth Factor beta3; D003907:Dexamethasone; D006820:Hyaluronic Acid