アブストラクト(27巻4号:神奈川歯学)

神奈川歯学

Japanese

Title : 細菌内毒素による破骨細胞の分化誘導
Subtitle : 原著
Authors : 能勢誠, 梅本俊夫
Authors(kana) :
Organization : 神奈川歯科大学口腔細菌学教室
Journal : 神奈川歯学
Volume : 27
Number : 4
Page : 517-530
Year/Month : 1993 / 3
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「緒言」歯周疾患における最も重要な臨床上の問題点の1つは, 歯槽骨の病的吸収による歯牙の喪失とそれに付随しておこる咀嚼機能の低下であろう. 歯槽骨吸収の主役となるのは破骨細胞であり, 1873年にKollikerによって破骨細胞の存在が初めて報告されて以来, 破骨細胞についての数多くの研究がなされてきた. 破骨細胞は, 形態学的には細胞質中に多数のミトコンドリアと空胞を含む2個以上の核を持つ多核巨細胞であり, 骨面に接した部分に波状縁(ruffled border)と明帯(clear zone)を形成して活発な骨吸収を行うことが知られている. また, 酵素組織化学的には酒石酸耐性酸性ホスファターゼ(tartrateresistant acid phosphatase ; TRACP)活性を有することがその特徴のひとつとして知られている. 近年, 破骨細胞の培養系の発達により, 破骨細胞が造血幹細胞に由来することおよび破骨細胞の分化には骨芽細胞様細胞あるいはMC3T3-G2/PA6細胞やST2細胞のような造血支持能を持つ間質細胞株とその前駆細胞が直接接触する必要があることが明らかにされている.
Practice : 歯科学
Keywords : 細菌内毒素(LPS), 破骨細胞, 歯周疾患

English

Title : Induction of Osteoclast Differentiation by Bacterial Lipopolysaccharides
Subtitle :
Authors : Makoto NOSE, Toshis Umemoto
Authors(kana) :
Organization : Department of Oral Microbiology Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 27
Number : 4
Page : 517-530
Year/Month : 1993 / 3
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : Abstract : The clonal preadipose cell line, MC3T3-G2/PA6, can support the differentiation of osteoclast-like multinucleated cells in response to 1α, 25-dihydroxyvitamin D3[1α, 25(OH)2D3]or prostaglandin E2, in culture with mouse spleen cells. In this study, whether bacterial lipopolysaccharides(LPS)can induce the differentiation of osteoclast in this coculture system was investigated. When C57BL/6N mouse bone marrow cells suspended in collagen gel solution were inoculated onto MC3T3-G2/PA6 cell layers, the colonies containing tartrate-resistant acid phosphatase(TRACP ; a maker enzyme of osteoclasts)positive mononuclear and multinuclear cells(TRACP positive colonies)were formed in the presence of LPS instead of 1α, 25(OH)2D3, and its formation increased by addition of dexamethasone. Lipid-A isolated from Selenomonas sputigena LPS also induced TRACP positive colony formation as well as original LPS, however degraded polysaccharide(DPS)had little effect on it. Resorption lacunae were also formed on ivory slices when bone marrow cells were cocultured with MG3T3-G2/PA6 cells in the presence of LPS or lipid-A. Furthermore, when bone marrow cells of C3H/HeJ mouse(LPS low-responsive mouse)were cocultured with MC3T3-G2/PA6 cells in the presence of LPS, a few TRACP positive colonies were formed. These results suggest that bacterial lipopolysaccharide can induce the differentiation of osteoclast indirectly, by stimulation of the production of factors from MC 3T3-G2/PA6 cells.
Practice : Dentistry
Keywords :