アブストラクト(24巻2号:神奈川歯学)

神奈川歯学

Japanese

Title : ラット頭蓋冠由来骨芽細胞による1, 25(OH)2D3 依存性リンタンパク質合成について
Subtitle : 原著
Authors : 長瀬達憲, 斎藤滋
Authors(kana) :
Organization : 神奈川歯科大学口腔生化学教室
Journal : 神奈川歯学
Volume : 24
Number : 2
Page : 322-332
Year/Month : 1989 / 9
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「緒言」咬合状態や咀嚼状態などが変化するとき, 歯周組織の活発な改造現象がみられ, 特に, 歯槽骨において骨吸収および骨の添加が行われている. 従ってこれらの現象においてCa2+ regulatory hormoneであるビタミンD3の機能の重要性が考えられる. 石灰化現象に関与する非コラーゲン性タンパク質の役割が指摘されているが, 不明な点が多い. Termineらによりosteonectinが精製・単離され, collagenとハイドロキシアパタイトとの結合性が示されたが, bone specificなタンパク質とは言えず, むしろ結合組織の発生・分化に重要であると報告されている. さらに, ビタミンK依存性のγ-carboxyglutamic acidを含むosteocalcin(Gla protein)とmatrix Gla proteinがPriceらとHauschkaらによりさらに近年LianらによりビタミンD3によって調節されるosteocalcinの遺伝子構造について報告されている.
Practice : 歯科学
Keywords : 骨芽細胞, ビタミンD3, リンタンパク質

English

Title : Phosphoproteins Biosynthesis Induced by 1,25(OH)2D3 in the Rat Calvarial Osteoblasts
Subtitle : Original article
Authors : Michinori NAGASE, Shigeru Saito
Authors(kana) :
Organization : Department of Oral Biochemistry, Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 24
Number : 2
Page : 322-332
Year/Month : 1989 / 9
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : Abstract : The present study attempts to explore the newly synthesized phosphoproteins secreted by osteoblast-like cells incubated with 1,25(OH)2D3. The phosphoproteins, which are non-collagenous proteins, may possess the ability to regulate bone mineral solubility. An osteoblast-enriched cell population isolated from 2 day-old rat calvaria by sequential enzymatic digestion was cultured in a defined medium containing dialized fetal calf serum protein (FCSP, 2mg/ml) with 1, 5and 10×10-9M 1,25(OH)2D3. At confluence, 32Pi (Na2 H32 PO4, NEX-011) was added for 24hr. The medium proteins were precipitated by cold 10% TCA, dissolved in 15 mM Tris-HCl, pH 7.4 containing 7M urea and chromatographed on hydroxyapatite columns (Bio-Rad, HTP). After stepwise elution with 6 mM, 0.1, 0.5 and 1.5 M Pi Hepes buffer pH 7.4 containing 3 M urea and 5 mM levamisole, the phosphoproteins were applied to 10% SDS-PAGE and autoradiographed. The 32Pi incorporated phosphoproteins of 75K, 66K, 58K, 42K, 38K, 24K, 22K, 19K, 15.5K, 13K and 3.5-10K molecular weight which were bound on a hydroxyapatite column were identified on autoradiograms of SDS-PAGE. The synthesis of 19K phosphoprotein was stable. However the synthesis of 75K, 66K, 38K and 15.5K phosphoproteins were increased by 1,25(OH)2D3. Therefore, 1,25(OH)2D3 induced phosphoproteins synthesized in rat calvarial osteoblasts, which can bind tightly on hydroxyapatite, may regulate the solubility of bone mineral and play a role in maintaintaining a blood / bone equilibrium.
Practice : Dentistry
Keywords :