アブストラクト(40巻2号:神奈川歯学)

神奈川歯学

Japanese

Title : ヒト歯根膜線維芽細胞の細胞接着と細胞分化に対するエナメル基質タンパク質の効果
Subtitle :
Authors : 飯島陽*, 根岸秀幸*, **, 川瀬俊夫*, **
Authors(kana) :
Organization : *神奈川歯科大学自然科学講座歯科生体工学分野, **神奈川歯科大学高次口腔科学研究所
Journal : 神奈川歯学
Volume : 40
Number : 2
Page : 97-109
Year/Month : 2005 / 12
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : amelogeninは, 歯根発生時のセメント質形成を誘導する基質タンパク質として作用していることが報告されている1). これに注目し, ブタ歯胚を0.5M酢酸溶液で抽出し, さらに精製したamelogeninを主成分とする基質成分をエナメル基質タンパク質とした. これをpropylene glycol alginateに溶解したものをenamel matrix derivative(Emdogain(R):EMD)として, 歯周組織再生療法に用いられている2). 基礎的研究として, サルのモデル実験にEMDを用いて, セメント質再生に有効であることが報告されている3). また, ヒトの実験的骨欠損部への応用4), EMDの臨床的安全性5), さらに骨内欠損へのEMDの有効性6)等, EMDが歯周組織再生治療に良好な結果を示す報告が多数ある. 一方, 日本人の歯周疾患にも有効であるかどうかを検討するために, 多施設でEMDが評価され, その有効性が報告されている7). EMDは露出歯根に吸着し, 歯根面に保持され, サイトカイン様の作用をすることが報告されている8, 9). すなわち, EMDは既知のポリペプチド因子であるEGF, bFGF, IL系, IGF系, NGF, PDGF, TNF, TGFβを含まず, また, ヒト歯根膜細胞に添加することにより細胞の増殖を促進し, コラーゲンの合成も促進する9).
Practice : 歯科学
Keywords : HPLF, EMD, 細胞接着, 歯周組織再生

English

Title : Effect of Enamel Matrix Proteins on Cell Attachment and Cell Differentiation of Human Periodontal Ligament Fibroblasts
Subtitle :
Authors : Yo IIJIMA*, Hideyuki NEGISHI*, **, Toshio KAWASE*, **
Authors(kana) :
Organization : *Departineiit of Natural Science, Division of Dental Bioengineering, Kanagawa Dental College, **Institute for Frontier Oral Science, Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 40
Number : 2
Page : 97-109
Year/Month : 2005 / 12
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : Porcine fetal enamel matrix derivative (EMD) is the clinically useful biomaterial for promoting periodontal regeneration. But the mechanisms of the formation of cementum, periodontal ligament and bone are not well understood. This study demonstrates that the effect of EMD on the cell attachment, proliferation, differentiation and the formation of extracellular matrix of human periodontal ligament fibroblasts (HPLF) using an in vitro model. HPLF were inoculated on the hydrophobic wells that were coated with EMD or the proteins of conditioned medium of HPLF (CMP) over a concentration range of 1 mg/ml to 0.49 μg/ml. CMP was separated from the media of HPLF that were cultured with fetal calf serum-free (FCS-free) MCDB107 medium for 24 hrs. The growth of HPLF was measured by determining the amount of DNA by use of diaminobenzoic acid. The expression levels of mRNA for βl and β3 integrin subunits and osteonectin (ON) of HPLF cultured on hydrophobic wells coated with 20 μg/ml of EMD or CMP were determined using reverse transcriptase-polymerase chain reaction (RT-PCR). Alkaline phosphatase (ALPase) activity was measured in cultures of HPLF on the dishes coated with EMD or CMP and in the presence of 5 nM 1α, 25(OH)2D3(D3) and 100nM dexamethasone (Dex). EMD or CMP were fractionated by Octyl Sepharose CL-4B column, separated by SDS-PAGE and stained with Coomassie Brilliant Blue R-250. The cell attachment and spreading activity of HPLF cultured on CMP for 3 hrs was significantly increased comparing with that of EMD. CMP stimulated ALPase activity of HPLF exposed with D3 and Dex comparing with that of HPLF on EMD. EMD or CMP stimulated the expression of ON mRNA of HPLF that regulates the adhesion of HPLF. Integrin β1 mRNA of HPLF was expressed the same level in each culture condition. But the expression of integrin β3 mRNA of HPLF was decreased by EMD or CMP comparing with a blank. These data suggest that the hydrophobic matrix proteins of EMD or CMP are responsible for regeneration of periodontal ligament.
Practice : Dentistry
Keywords : HPLF, EMD