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Ultrastructure of bone resorption by osteoclasts

Research Project

Project/Area Number 62570808
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Morphological basic dentistry
Research InstitutionHIROSHIMA UNIVERSITY

Principal Investigator

MITSUTERU Hosoi (1988)  Hiroshima University, Associate Professor, 歯学部, 助教授 (00034190)

明坂 年隆 (1987)  広島大学, 歯学部, 講師 (70116523)

Co-Investigator(Kenkyū-buntansha) TOSHITAKA Akisaka  Asahi University, Professor, 歯学部, 教授 (70116523)
Project Period (FY) 1987 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1988: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1987: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsQuick freezing / Freeze-substitution / Osteoclast / Freeze-fracture / 酸性フォスファターゼ / 膜内粒子 / 前破骨細胞 / フリーズ・レプリカ法 / 酒石酸耐性酸性フォスファターゼ
Research Abstract

The main purpose of the present study was to pursue the native state of in vivo osteoclasts in chick metaphyseal bone at electron microscopic level. Three different methods were employed in the present research: (1) quick freezing and freeze-substitution, (2) freeze-replica and (3) cytochemical methods.
Quick freezing and substitution method ahowed several unreported results that the ruffled border was supported with the undercoat material, whereas the clear zone and baso-lateral membrane were devoid of it. One of the interesting finding was that cementing materials was observed between the clear zone membrane and the surface of calcified matrix. The combination of freeze substitution and saponin detergent visualized us the cytoskeletal components of osteoclasts. We clarified the ultrastructural difference among the ruffled border, clear zone and other cytoplasm after quick freezing. The ruffled border contained densely packed and disorganized microfilament meshwork. The results as ment … More ioned above was appeared in Anatomical Record (vol.224, pp.323-332, 1988).
Freeze-replicas showed a remarkable differences among ruffled border, clear zone, baso-lateral and intracytoplasmic membranes in the shape, intensity, and pattern of intramembtanous particles (IMPS). The number and pattern of IMPs in ruffled border membrane was dramatically changed from attached to detached osteoclasts. Our observations indicate that IMPs was synchronized with cell activity. We are now planning to submit the results obtained by freeze-replicas to some anatomical or bone journals.
The results of our cytochemical study was appeared in Cell & Tis Res (vol. 255, pp.69-76, 1989) in which tartrate resistant acid phoshatase (ACPase) activity was detected within biosynthetic pathway of osteoclasts and the surface layer of resorpted bone. Presteoclast showed similar localization pattern to the mature osteoclasts. This type of ACPase identified a family of osteoclast from other cells.
From our study it becomes evident that freezing methods are very valuable and inevitable for the morphological study of calcified tissues. Our study provided new information of in vivo osteoclast ultrastructure. Less

Report

(3 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] Akisaka T.,et al.: Anatomical Record. 224. 323-332 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Akisaka T.,et al.: Cell & Tissue Research. 255. 69-76 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Akisaka T et al.: "Surface modifications at the penosseous region of chick osteoclast as revealed by freeze-substitution." Anatomical Record. 224. 323-332 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Akisaka T et al.: "Different tartrate sensitivity and pH optimum for two isoenzymes to acid phosphatase in osteoclast" Cell & Tissue Research. 255. 69-76 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Akisaka,T., et al.: Anatomical Record. 224. 323-332 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Akisaka,T., et al.: Cell & Tissue Research. 255. 69-76 (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] T. Akisaka;G.P. Subita;Y. Shigenaga: Anatomical Record. (1988)

    • Related Report
      1987 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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