アブストラクト(24巻4号:神奈川歯学)

神奈川歯学

Japanese

Title : 培養骨芽細胞のTransforming growth factor-β (TGF-β)とオステオポンチンの合成に及ぼす間歇的圧縮力の影響
Subtitle : 原著
Authors : 山内雅人, 鈴木祥井
Authors(kana) :
Organization : 神奈川歯科大学矯正学教室
Journal : 神奈川歯学
Volume : 24
Number : 4
Page : 716-729
Year/Month : 1990 / 3
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「緒言」 機械的外力に対する歯周組織の反応性を理解することは, 矯正学的な歯の移動や, 咬合圧の生理的, あるいは人為的変化に対する歯周組織の改造のメカニズムを知るために重要と考えられる. 特に, 歯の支持組織としての歯槽骨は, 機械的外力に対して骨の吸収と形成のバランスによってその機能的な構造を保持する様に組織改造を行うことが知られており, その改造現象に関与する細胞の調節機構の解明が重要な関心事となっている. 一般的に, 骨の改造現象は生理活性物質やサイトカイン, あるいは細胞外の基質蛋白質など, 多くの化学物質を介する, 吸収と形成のカップリング機構によって調節されていると考えられている. すなわち, 骨改造過程は破骨細胞の分化, 誘導, ならびに活性化による骨の吸収と, それに引き続いて起こる骨芽細胞の分化, 活性化による骨の形成という, 一連の細胞連鎖機構で説明されている. 近年, 種々の培養細胞を用いて機械的外力を加えた際の骨系細胞の応答性に関する生化学的研究が行われてきている.
Practice : 歯科学
Keywords : 間歇的圧縮力, TGF-β, オステオポンチン

English

Title : Effects of Intermittent Compressive Force on Transforming Growth Factor β and Osteopontin Synthesis in Cultured Bone Cells
Subtitle :
Authors : Masato YAMAUCHI, Yoshii Suzuki
Authors(kana) :
Organization : Department of Orthodontics Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 24
Number : 4
Page : 716-729
Year/Month : 1990 / 3
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : [Abstract]: It has long been thought that the process of bone remodeling is regulated by the chain reactions of bone cells involving chemical mediators, growth factors and synthesis of extracellular matrix proteins etc. In this context, it has also been recognized that physical stimulation is an important factor in the regulation of bone remodeling. Thus, it is vitally imortant to understand whether the physical stimulation can induce the cellular events regarding autocrine regulation of protein synthesis. This study was conducted to examine the effects of hydrostatic intermittent compressive force (ICF) on the synthesis of the transforming growth factor β (TGF-β) and matrix phosphoproteins which may play an important role in the process of bone remodeling. The rat osteosarcoma cells (ROS 17/2.8) were cultured with DMEM containing 10% FCSP. ICF was applied to sub-confluent cells at 130 mb, 15/min cycle for 48h. ICF increased TGF-β activity of the conditioned medium. This was assessed by its capacity to promote anchorage independent growth of NRK 49F cells and to inhibit the growth of human hepatoma cells (Hep-3B). Furthermore, ICF stimulated the synthesis of the phosphoproteins with Mr. 75 KDa by about 1.4 fold which was visualized by SDS-PAGE on 5 ~ 15% gradient gel. Immunoprecipitation of the phosphoproteins with rat osteopontin antibody revealed that the 75 KDa phosphoprotein was identical to osteopontin. The 75 KDa osteopontin synthesis was inhibited by the addition of TGF-β antibody in a dose dependent manner. These results suggested that ICF stimulated the synthesis of TGF-β and osteopontin in ROS 17/2.8 cells and that the osteopontin synthesis could be regulated by TGF-β.
Practice : Dentistry
Keywords : TGF-β