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Origin and Disappearance of Diacylglycerol, a Protein Kinase C Activator, in Salivary Glands

Research Project

Project/Area Number 01571034
Research Category

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

Allocation TypeSingle-year Grants
Research Field Functional basic dentistry
Research InstitutionAsahi University

Principal Investigator

YOKOTA Yutaka  Asahi University School of Dentistry, Professor, 歯学部, 教授 (40075990)

Co-Investigator(Kenkyū-buntansha) SHIN Sun Ok  Asahi University School of Dentistry, Assistant Researcher, 歯学部, 助手 (30226336)
MIZUNO Masako  Asahi University School of Dentistry, Assistant Researcher, 歯学部, 助手 (80181907)
YASHIRO Koji  Asahi University School of Dentistry, Assistant Professor, 歯学部, 講師 (50182316)
KAMEYAMA Kameyama  Asahi University School of Dentistry, Associate Professor, 歯学部, 助教授 (50161245)
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1990: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1989: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsDiacylglycerol / Membrane lipid / Ether-linked phospholipid / Acyl chain composition / Phospholipase A_2 / Lysophospholipid acyltransferase / Secretory granule / Rat salivary gland / ジアシルグリセロ-ル / 脂肪酸組成 / ホスホリパ-ゼC / リン脂質 / イソプロテレノ-ル / アミラ-ゼ分泌
Research Abstract

Membrane lipids play an important role in signal transmission via their specific metabolic pathways. Especially, there are many reports that newly formed diacylglycerol (DAG) through receptor activation binds to protein kinase C resulting in enhancement of its Ca^<2+>-sensitivity. Therefore, DAG attracts many attentions as an activator of protein kinase C in many cellular systems including secretory one. In this study, we have characterized the acyl chain composition of DAG and the related metabolic pathway to approach the clarification of origin and disappearance of DAG in secretory cells.
The acyl chain of DAG from both homogenate of rat submandibular and sublingual salivary glands mainly consisted of saturated fatty acids (more than 79% of the total) such as palmitic and stearic acids. Although oleic acid existed 13% of the total, polyunsaturated ones were very little in DAG. This profile of saturated fatty acid enrichment was similar to the acyl chain composition of triacylglycerol … More rather than those of phosphatidylcholine and phosphatidylethanolamine although 1-stearoyl-2-arachidonoyl-DAG was known as a potent activator of protein kinase C. Therefore, the feature of DAG formed in signal transmission was thought to result from conversion from phospholipid to DAG or deacylation-reacylation during cell activation. Concerning the deacylation-reacylation pathway, we clarified the substrate specificities of microsomal phospholipase A_2, 1-acylglycerophosphate acyltransferase and 1-acylglycerophosphocholine acyltransferase. Furthermore, composition of ether-linked phospholipids and their side chain composition were established comparing properties of 1-alkenylglycerophosphocholine acyltransferase. On the other hand, membrane-bound phospholipase A_2 having different substrate specificity from the microsomal one was detected in secretory granules ; functional relationship between the requirement of granular membrane lipids and membrane fusion was also suggested.
These results are thought to contribute the clarification of lipid metabolism responding to secretory stimulus in the cells. Less

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] Koji Yashiro: "Phospholipid metabolism in rat submandibular gland.Positional distribution of fatty acids in phospatidylーcholine and microsomal lysophospholipid acytransferase system concerning proliferation" Biochimica et Biophysica Acta. 1005. 56-64 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Masako Mizuno: "Biochemical and Physical analysis of subcellular membranes in rat parotid gland enlarged by chronic isoproterenol administration" Comparative Biochemistry and Physiolgy. 96B. 171-176 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 横田 豊: "唾液分泌機構の生化学的研究" 岐阜歯科学会雑誌. Special issue. 265-287 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Masako Mizuno: "Characterization of secretory granular membranes from rat parotid gland: analysis of membrane lipid composition and fluidity" Japanese Journal of Oral Biology. 32. 563-573 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 八代 耕児: "イソプロテレノ-ルの連続投与による唾液腺の遊離脂肪酸組成の変動" 岐阜歯科学会雑誌.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Masako Mizuno: "Ca^<2+>ーIndepent phospholipase A_2 activity associated with secretory granular in rat parotid gland" Biochimica et Biophysica Acta.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Yashiro, K., Kameyama, Y., Mizuno, M., Hayashi, S., Sakashita, Y. and Yokota, Y.: "Phospholipid metabolism in rat submandibular gland. Positional distribution of fatty acids in phosphatidylcholine and microsomal lysophospholipid acyltransferase systems concerning proliferation" Biochimica et Biophysica Acta. 1005. 56-64 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Mizuno, M., Yashiro, K., Kameyama, Y., Hayashi, S., Sakashita, Y. and Yokota, Y.: "Biochemical and physical analysis of subcellular membranes in rat parotid gland enlarged by chronic isoproterenol administration" Comparative Biochemistry and Physiology. 96B. 171-176 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Yokota, Y.: "Biochemical studies on mechanism of saliva secretion" Journal of Gifu Dental Society, Special issue for 20th anniversary of Asahi University. 265-287 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Mizuno, M., Kameyama, Y., Yashiro, K. and Yokota, Y.: "Characterization of secretory granular membranes from rat parotid gland : Analysis of membrane lipid composition and fluidity" Japanese Journal of Oral Biology. 32. 563-573 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Yashiro, K., Shin, S., Sakashita, Y., Himejima, A., Mori, A., Yoshida, M. and Yokota, Y.: "Changes in the free fatty acid composition of rat salivary glands induced by chronic administration of isoproterenol" Journal of Gifu Dental Society.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Mizuno, M., Kameyama, Y. and Yokota, Y.: "Ca^<2+>-Independent phospholipase A_2 activity associated with secretory granular membranes in rat parotid gland" Biochimica et Biophysica Acta.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Masako Mizuno: "Biochemical and physical analysis of subcellular membranes in rat parotid gland enlarged by chronic isoproterenol administration" Comparative Biochemistry and Physiology. 96B. 171-176 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 横田 豊: "唾液分泌機構の生化学的研究" 岐阜歯科学会雑誌. Special issue. 265-287 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Masako Mizuno: "Characterization of secretory granular membranes from rat parotid gland: analysis of membrane lipid composition and fluidity" Japanese Journal of Oral Biology. 32. 563-573 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 八代 耕児: "イソプロテレノ-ルの連続投与による唾液腺の遊離脂肪酸組成の変動" 岐阜歯科学会雑誌.

    • Related Report
      1990 Annual Research Report
  • [Publications] Masako Mizuno: "Ca^<2+>ーIndependent phospholipase A_2 activity associated with secretory granular membranes in rat parotid gland" Biochimica et Biophysica Acta.

    • Related Report
      1990 Annual Research Report
  • [Publications] Koji Yashiro: "Comparison of phospholipid Ν-methylation activity in rat submandibular salivary gland and liver" Archives of Oral Biology. 34. 203-208 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Koji Yashiro: "Phospholipid metabolism in rat submandibular gland.Positional distribution of fatty acids in phosphatidylcholine and microsomal lysophospholipid acyltransferase systems concerning proliferation" Biochimica et Biophysica Acta. 1005. 56-64 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Masako Mizuno: "Biochemical and physical analysis of subcellular membranes in rat parotid gland enlarged by chronic isoproterenol administration" Comparative Biochemistry and Physiology.

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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