Résumé
The main objective of this study was to observe the adhesion, proliferation and differentiation of mouse osteblast-like MC3T3-E1 cells cultured on maleic anhydride-modified poly(D,L-lactic acid) (MPLA) and poly(D,L-lactic acid) (PDLLA) polymers, and to evaluate the cytocompatibility of MPLA polymer. The effects of MPLA and PDLLA polymers on the morphology, adhesion, proliferation, the content of total cellular protein, alkaline phosphatase (ALP) activity and the content of Ca of MC3T3-E1 cells were explored. These results indicated that MC3T3-E1 cells on MPLA polymer adhered and spread more fully. On MPLA polymer, the proliferation, total protein content, ALP activity, Ca content of the cells were significantly higher than those of the cells on PDLLA polymer (P < 0.01). It was concluded that MPLA polymer could promote the adhesion, spreading, proliferation and the synthesis of protein of osteoblasts, and also induced the differentiation and mineralization of osteoblasts, suggesting that MPLA polymer might have the better cytocompatibility than PDLLA.
Sujets)
Animaux , Souris , Matériaux biocompatibles , Chimie , Pharmacologie , Adhérence cellulaire , Différenciation cellulaire , Lignée cellulaire , Prolifération cellulaire , Embryon de mammifère , Acide lactique , Chimie , Pharmacologie , Anhydrides maléiques , Chimie , Pharmacologie , Ostéoblastes , Biologie cellulaire , Polyesters , Polymères , Chimie , PharmacologieRésumé
BACKGROUND: Shape memory polyurethane (SMPU) may be employed for bone repair capable of resisting stress shielding and bone non-union due to the shape memory effect responding to changed external temperature. Evaluating the cytocompatibility of SMPU is important for its further in vivo experiments and applications. However, few have been done to investigate the cytocompatibility of SMPU after encounted from deforming and shape recovering.OBJECTIVE: To evaluate the osteoblast compatibility of SMPU before and after stretching-shape recovering process. METHODS: Solvent casting method was used to fabricate SMPU films; the obtained SMPU films were stretched to 200%, and then fixed and finally recovered to its odginal shape at T_g+15 ℃, T_g-15 ℃ and T_g+15 ℃, respectively. Atomic force microscope (AFM) with tapping mode was employed to probe the surface morphology and phase separation of SMPU. Primary osteoblasts at 3-5 passages were seeded on SMPU films in vitro to evaluate the adhesion, proliferation and spreading of osteoblasts. RESULTS AND CONCLUSION: There were obvious and regular phase separation resulted from soft segments and hard segments in SMPU, and some groove-ddge architectures within a scale of micrometers were produced by the stretching-shape recovering process. These special micropatterned structures promoted osteoblast adhesion and proliferation, and also resulted in partially oriented cell growth along the grooves. Shape memory process, i.e. stretching-shape recovering process may obviously change the surface morphology of SMPU films, and suggesting better biocompatibility with osteoblasts.
Résumé
In the research field of bone tissue engineering, the interaction of osteoblast and substrate is pivotal and the adhesion of osteoblast to biomaterials is the basic condition. Firstly, osteoblast must adhere to biomaterials, then it can migrate, proliferate and differentiate. This paper introduces the proteins relating to the adhesion of osteoblast and the influences of relating surface character and modification of biomaterials on the adhesion ability of osteoblast. These could serve as basic data and useful reference for the development of bone tissue engineering and tissue engineering scaffold materials.
Sujets)
Humains , Matériaux biocompatibles , Chimie , Régénération osseuse , Adhérence cellulaire , Différenciation cellulaire , Prolifération cellulaire , Ostéoblastes , Biologie cellulaire , Propriétés de surface , Ingénierie tissulaire , Méthodes , Structures d'échafaudage tissulaires , ChimieRésumé
Biocompatibility of a newly developed ethylenediamine modified poly (DL-latic acid) (EMPLA) with osteoblasts was investigated by means of cell morphology and cell proliferation. Films of PLA and EMPLA were made by solvent casting. Osteoblasts obtained from crania of neonatal Wistar rats were cultured on surfaces of PLA and EMPLA, with glass as control. The cell morphology was observed by phase contrast microscope and the cell proliferation was determined by MTT assay. The morphology observations revealed that the osteoblasts cultured on EMPLA spread wider than those on PLA, and much more cells were confluent on EMPLA, compared to those on PLA and glass. The growth curves showed the osteoblasts on EMPLA grew faster than did those on PLA and glass. The results exhibited that the biocompatibility of EMPLA with osteoblasts is better than that of PLA and glass, which suggested wide applications of EMPLA in biomedical area, especially in tissue engineering.
Sujets)
Animaux , Rats , Animaux nouveau-nés , Matériaux biocompatibles , Chimie , Pharmacologie , Prolifération cellulaire , Cellules cultivées , Éthylènediamines , Chimie , Pharmacologie , Acide lactique , Chimie , Pharmacologie , Test de matériaux , Méthodes , Ostéoblastes , Biologie cellulaire , Polyesters , Polymères , Chimie , Pharmacologie , Rat WistarRésumé
In bone tissue engineering, a highly porous artificial extracellular matrix or scaffold is essential to the attachment, proliferation and differentiation of bone cells (osteoblast, osteoclast and osteocytes) and the formation of bone tissue. However, conventional scaffold materials for bone tissue engineering proved less valuable for actual applications because they lack mechanical strength, interconnected channel network, and controllable porosity or channel size. Therefore,to explore the ideal scaffold materials is one of the popular studies on current bone tissue engineering. In this paper, we review, the application and advancement of a newly-developed technology generally known as rapid prototyping (RP) techniques in bone tissue engineering.