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Analysis of structure and function of sugar chains included in Fc receptor

Research Project

Project/Area Number 02808025
Research Category

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

Allocation TypeSingle-year Grants
Research Field 物質生物化学
Research Institutionthe University of Tokyo

Principal Investigator

TAKASAKI Seiichi  the Institute of Medical Science, the University of Tokyo, Associate Professor, 医科学研究所, 助教授 (80112093)

Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1991: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1990: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsFc receptor / Sugar chain / phagocytosis / Protein phosphorylation / Arachidonic acid metabolism / 貧食能 / リン酸化 / アラキドン酸 / 貪食 / 糖タンパク質 / 抗原抗体複合体
Research Abstract

A murine macrophage cell line, P388Dl, expresses Fc receptors which recognize Fc portion of IgG bound to antigen, but is not able to ingest the antigen-antibody complex. However, modification of cell surface sugar chains can induce Fc receptor-mediated phagocytosis without affecting nonspecific phagocytosis of latex beads. It is considered, therefore, that Fc receptors are structurally modified to express their function. To prove this possibility, the in vitro system for induction of phagocytosis by different kinds of reagents which modify structures of sugar chains was established. By using this system, the following results were obtained. (1)Altered glycosylation-induced phagocytosis was mediated by Fcr2b receptor. (2)The sugar chains of this receptor actually changed after induction of phagocytosis. (3)This structural change affected the ingestion of ligands bound to the receptor, but not the binding of ligands to the receptor. (4)I?inding of ligands to the structurally altered receptor induced phosphorylation of cellular proteins including Fc receptor itself, the release of arachidonic acid from the cells, and activation of phospholipase A2 responsible for arachidonic acid release. (5)Addition of inhibitors of arachidonic acid metabolism to the culture media of induced cells suppressed protein phosphorylation and phagocytosis.
Thus, the results suggest that altered glycosylation of Fc receptor affects the ingestion process of phagocytosis by activating arachidonic acid metabolism and protein phosphorylation, resulting in the induction of Fc receptor-mediated phagocytosis.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] 福島 慶子: "Induction of Fc receptorーmediated phagocytosis of a macrophage cell line by processing inhibitors of Nーlinked sugar chains"

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 福島 慶子: "Suppressive role of sialylated Nーglycans in Fe receptorーmediated phagocytosis"

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 福島 慶子: "Activation of protein phosphorylation and arachidonic acid release associated with altered glycosylationーinduced phagocytosis"

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Keiko Fukushima: "Induction of Fc receptor-mediated phago-cytosis of a macrophage cell line by processing inhibitors of N-linked sugar chains"

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Keiko Fukushima: "Suppressive role of sialylad N-glycans in Fc receptor-mediated phagocytosis"

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Keiko Fukushima: "Activation of protein phosphorylation and arachidonic acid release associated with altered glycosylation-induced phago-cytosis"

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 福島慶子: "Suppressive role of sialylated Nーglycans in Fc receptorーmediated phagocytosis"

    • Related Report
      1991 Annual Research Report
  • [Publications] 福島慶子: "Activation of protein phosphorylation and arachidonic acid release associated with altered glycosylationーinduced phagocytosis"

    • Related Report
      1991 Annual Research Report
  • [Publications] 福島 慶子: "Swainsonine and castanospermine induce Fc receptorーmediated phagocytosis in a mouse macrophage cell line."

    • Related Report
      1990 Annual Research Report
  • [Publications] 福島 慶子: "Induction of Fc receptorーmediated phagocytosis by treatment of a macrophage cell line with tunicamycin and sialidase."

    • Related Report
      1990 Annual Research Report
  • [Publications] 福島 慶子: "Altered glycosylation of Fcγ2bーReceptor associated with induction of phagocytosis."

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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