CELLULAR ATTACHMENT AND GENE EXPRESSION OF OSTEOBLAST-LIKE CELLS ON ZIRCONIA CERAMIC SURFACES
배아란, 백진, 이희수, 김형섭, 우이형,
소속 상세정보
배아란 ( Pae Ah-Ran ) - 이화여자대학교 치과보철학교실
백진 ( Baik Jin ) - 경희대학교 치과대학 치과보철학교실
이희수 ( Lee Hee-Su ) - 강릉대학교 치과대학 구강해부학교실
김형섭 ( Kim Hyeong-Seob ) - 경희대학교 치과대학
우이형 ( Woo Yi-Hyung ) - 경희대학교 치과대학
KMID : 0362420080460030227
Abstract
Statement of Problem: Zirconium oxide can be a substitute to titanium as implant materials to solve the esthetic problems of dark color in the gingival portion of implant restorations.
Purpose: This study was performed to define attachment and growth behavior of osteoblast- like cells cultured on grooved surfaces of zirconium oxide and evaluate the genetic effect of zirconium oxide surfaces using the reverse transcriptase-polymerase chain reaction (RT-PCR).
Material and Methods: MC3T3-E1 cells were cultured on (1) commercially pure titanium discs with smooth surface (T group), (2) yttrium-stabilized tetragonal zirconia polycrystal (Y-TZP) with machined surface (ZS group), and (3) Y-TZP with 100μm grooves (ZG group). Cell proliferation activity was evaluated through MTT assay and cell morphology was examined by SEM. The mRNA expression of Runx2, alkaline phosphatase, osteocalcin, TGF-β1, IGF-1, G3PDH in E1 cells were evaluated by RT-PCR.
Results: From the MTT assay, after 48 hours of adhesion of MC3T3-E1 cells, the mean optical density value of T group and ZG group significantly increased compared to the ZS group. SEM images of osteoblast-like cells showed that significantly more cells were observed to attach to the grooves and appeared to follow the direction of the grooves. After 24 hours of cell adhesion, more spreading and flattening of cells with active filopodia formation occurred. Results of RT-PCR suggest that T group, ZS group, and ZG group showed comparable osteoblast-specific gene expression after 24 hours of cell incubation.
Conclusion: Surface topography and material of implants can play an important role in expression of osteoblast phenotype markers. Zirconia ceramic showed comparable biological responses of osteoblast-like cells with titanium during a short-time cell culture period. Also, grooves influence cell spreading and guide the cells to be aligned within surface grooves.
키워드
Zirconia ceramic;MC3T3-E1 cells;Contact guidance;Cell proliferation;Gene expression
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