| Project/Area Number |
04454449
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Morphological basic dentistry
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| Research Institution | Hokkaido University |
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Principal Investigator |
WAKITA Minoru Hokkaido University, School of Dentistry, Professor, 歯学部, 教授 (40018916)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Shigeru Hokkaido University, School of Dentistry, instructor, 歯学部, 助手 (70241338)
DOMON Takanori Hokkaido University, School of Dentistry, instructor, 歯学部, 助手 (50217618)
YAMAMOTO Tsuneyuki Hokkaido University, School of Dentistry, lecturer, 歯学部, 講師 (80200822)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥6,700,000 (Direct Cost: ¥6,700,000)
Fiscal Year 1993: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1992: ¥4,700,000 (Direct Cost: ¥4,700,000)
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| Keywords | Osteoclast / Tartrate-resistant acid phosphatase / Ruffled border / Cell culture / Cell locomotion / Three-dimensional structure / 吸収窩 |
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| Research Abstract |
Osteoclasts and macrophages of ddy strain mice were isolated, and then culturedwith or without dentine slices for 72 hours. After the incubation, tartrate-resistant acid phosphatase (TRACPase) and adic phosphateas (ACPase) activities were detected in them by the azo dye method. ACPasc-positive cells phagocytized indian inks, however, they showed neither TRACPase nor resosrptive activity. TRACPase-positive cells made lacunae on the dentine slices, and showed sthe ruffled border and clear zone. Therefore, ACPase-positive cells with phagocytosis were seemed to be macrophages, and TRACPase-positive cells were osteoclasts. These results suggested that TRACPase activity was specific for osteoclastic cells, not macrophages, in 72 hours culture of ddy mice.
One multinucleated TRACPase-positive cell with comnplicated contours was observed on the dentine slice by light microscopy, and then this cell was serially sectioned by altermating semithin and ultrathin sections to observe its ultrastructure and three-dimensional sturcture. By transmission electron microscopy, this cell had the similar structure as those of osteoclasts, and possessed the clear zone-like structures, but showed no ruffled border. A three-dimensional reconstruction showed that this cell had very flat and complicated outlines, and extended its cell body to the back side of the dentine slice. These results suggested that this cell might be a locomoting osteoclast.
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