Tissue engineering of bone on micropatterned biodegradable polyester films

Kenar, H
Kose, GT
Hasırcı, Vasıf Nejat
In this study, the effect of cell alignment on proliferation and phenotype expression of rat bone marrow derived osteoblasts on micropatterned (MP) PHBV and P(L/D,L)LA films with 27 mu m wide parallel microgrooves was investigated. Immobilization of fibrinogen (Fb) on film surface by adsorption increased hydrophilicity, while covalent immobilization decreased it. Amount of Fb immobilized was significantly higher upon covalent bonding (153.1 +/- 42.4 mu g Fb/cm(2)) than when adsorbed (10.0 +/- 3.3 mu g Fb/cm(2)). It was observed that the presence of MP did not influence cell proliferation in the long run. Osteoblasts on MP films with adsorbed (MP Fb(a)) and covalently immobilized Fb (MP Fb(1)) aligned parallel to the groove axis with mean deviation angles of 10.59 +/- 23.47 and 29.02 +/- 33.03 degrees, respectively, while on tissue culture polystyrene (TCP), on unpatterned films (UNP) and on UNP with adsorbed Fb (UNP Fb(a)) alignment with an arbitrary axis was much higher: 46.66 +/- 24.98, 48.72 +/- 31.19, 47.74 +/- 27.29 degrees, respectively. Fb-free MP films were not effective in cell alignment, and clumps were formed. Cell alignment achieved on MP Fb(a) films did not influence cell proliferation, but increased differentiation, as shown by ALP activity per cell and the evenness and the amount of calcium phosphate deposition. It was concluded that orientation of cells was influential on their differentiation and also, MP cell carriers with chemical cues on their surfaces are important in improving tissue repair.


Bone tissue engineering on patterned collagen films: an in vitro study
Ber, S; Kose, GT; Hasırcı, Vasıf Nejat (2005-05-01)
This study aimed at guiding osteoblast cells from rat bone marrow on chemically modified and patterned collagen films to study the influence of pattern, on cell guidance. The films were stabilized using different treatment methods including crosslinking with carbodiimide (EDC) and glutaraldehyde, dehydrothermal treatment (DHT), and deposition of calcium phosphate on the collagen membrane.
Biophysical investigation of the effects of antioxidants on normal and diabetic rat bone tissues at molecular level
Boyar, Handan; Severcan, Feride; Department of Biology (2004)
In the first part of this study, the effect of diabetes mellitus on the long bones (femur and tibia) of the streptozocin induced diabetic rats and the effect of selenium (Se) treatment on these bones are investigated at molecular level by Fourier transform infrared (FTIR) spectroscopy, light and electron microscopy. In the second part of this study, the effect of selenium and vitamin E deficiency or selenium toxicity on rat bones have been studied by FTIR spectroscopy. The results of the first part of the p...
In vitro bone tissue engineering on patterned biodegradable polyester blends
Kenar, Halime; Hasırcı, Vasıf Nejat; Toner, Mehmet; Department of Biotechnology (2003)
This study aimed at guiding osteoblast cells on biodegradable polymer carriers with well-defined surface microtopography and chemistry, and investigating the effect of cell alignment on osteoblast phenotype expression. A blend of two different polyesters, one being natural in origin (PHBV) and the other synthetic (P(L/DL)LA), was used to form a film with parallel macro- (250 um wide) or microgrooves (27 jam wide) on its surface, by solvent casting on patterned templates. The micropatterned Si template was p...
Bone generation on PHBV matrices: an in vitro study
Kose, GT; Korkusuz, F; Korkusuz, P; Purali, N; Ozkul, A; Hasırcı, Vasıf Nejat (2003-12-01)
Bone formation was investigated in vitro by culturing rat marrow stromal osteoblasts in biodegradable, macroporous poly(3-hydroxybutyric acid-co-3-bydroxyvaleric acid) (PHBV) matrices over a period of 60 days. Foams were prepared after solvent evaporation and solute leaching. PHBV solutions with different concentrations were prepared in chloroform: dichloromethane (1:2, v/v). In order to create a matrix with high porosity and uniform pore sizes, sieved sucrose crystals (300-500 mum) were used. PHBV foams we...
Protoplast isolation and culture in sugar beet (Beta vulgaris L.)
Gürel, Ekrem; Gürel, Songül; Kaya, Zeki (2002-03-01)
In this study, attempts were made to optimise conditions for protoplast isolation from suspension and mesophyll cells, growth of isolated protoplasts and formation of callus from the cultured protoplasts. The enzyme mixture containing 1.0% cellulase, 0.1% hemicellulase, 1.0% pectinase and 0.1% driselase was found to be the most suitable combination for yield and viability of both suspension-and mesophyll-derived protoplasts from sugar beet. Genotypic variation for plating efficiency was significant; ELK345a...
Citation Formats
H. Kenar, G. Kose, and V. N. Hasırcı, “Tissue engineering of bone on micropatterned biodegradable polyester films,” BIOMATERIALS, pp. 885–895, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/32298.