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2009 Fiscal Year Final Research Report

Analysis of GBP receptor structure and GBP signal transduction in hemocytes

Research Project

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Project/Area Number 18370031
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Animal physiology/Animal behavior
Research InstitutionSaga University

Principal Investigator

HAYAKAWA Yoichi  Saga University, 農学部, 教授 (50164926)

Co-Investigator(Kenkyū-buntansha) AIZAWA Tomoyasu  北海道大学, 大学院・理学研究科, 准教授 (40333596)
Project Period (FY) 2006 – 2009
Keywords昆虫 / growth-blocking peptide / サイトカイン / GBP受容体アダプター / 血球細胞 / インテグリン / シグナル伝達
Research Abstract

Growth-blocking peptide (GBP) is an insect cytokine that stimulates a class of immune cells called plasmatocytes to adhere to each other and a foreign surface. Although structure-activity studies have been extensively performed in GBP and its mutants of Lepidoptera Pseudaletia separata, the signaling pathway of GBP-dependent activation of plasmatocytes remains unknown. We identified a novel adaptor protein (P77) with a molecular mass of 77kDa containing SH2/SH3 domain binding motifs and an immunoreceptor tyrosine-based activation motif (ITAM)-like domain in the cytoplasmic region of the C-terminus. Although P77 did not have the capacity for direct binding with GBP, its cytoplasmic tyrosine residues were specifically phosphorylated within seconds after addition of GBP to a plasmatocyte suspension. Tyrosine phosphorylation of P77 was also observed when hemocytes were incubated with Enterobactor cloacae or Micrococcus luteus, but this phosphorylation was found to be induced by GBP released from hemocytes stimulated by the pathogens. We further detected tyrosine phosphorylation of the integrin β subunit in plasmatocytes stimulated by GBP. Double-stranded RNAs targeting P77 not only decreased GBP-dependent tyrosine phosphorylation of the integrin β subunit, but also abolished the GBP-induced spreading of plasmatocytes on foreign surfaces. P77 RNAi larvae also showed significantly higher mortality than control larvae following infection with Serratia marcescens, thus indicating that P77 is essential for GBP to mediate a normal innate cellular immunity in insects. These results demonstrated that GBP signaling in plasmatocytes requires the adaptor protein P77 and that active P77-assisted tyrosine phosphorylation of integrins is critical for the activation of plasmatocytes.

  • Research Products

    (20 results)

All 2010 2009 2008 2007 2006 Other

All Journal Article (11 results) Presentation (9 results)

  • [Journal Article] The C-terminal elongation of Growth-blocking peptide enhances its biological activity and micelle binding affinity.2009

    • Author(s)
      Umetsu, Y, Aizawa, T, Muto, K, Yamamoto, H, Kamiya, M, Kumaki, Y, Demura, M, Hayakawa, Y., Kawano, K.
    • Journal Title

      J. Biol. Chem. 284

      Pages: 29625-29634

  • [Journal Article] A novel peptide mediates aggregation and migration of hemocytes from an insect.2009

    • Author(s)
      Nakatogawa, S., Oda, Y., Kamiya, M., Kamijima, T., Aizawa, T., Clark, KD., Kawano, K., Strand, R.M., Hayakawa, Y.
    • Journal Title

      Curr. Biol. 19

      Pages: 779-785

  • [Journal Article] A gene involved in the food preferences of larval Drosophila melanogaster.2008

    • Author(s)
      Ryuda, M., Tsuzuki, S., Tanimura, T., Tojo, S., Hayakawa, Y.
    • Journal Title

      J. Insect Physiol. 54

      Pages: 1440-1445

  • [Journal Article] Strains in the common cutworm, Spodoptera litura (Lepidoptera: Noctuidae) with differing host ranges.2008

    • Author(s)
      Tojo, S., Hayakawa, Y., Phaophan P.
    • Journal Title

      43

      Pages: 491-496

  • [Journal Article] A novel gene associated with intraspecific predation in Spodoptera litura larvae.2008

    • Author(s)
      Ryuda, M., Nakayama, H., Hayakawa, Y.
    • Journal Title

      Appl. Entomol. Zool. 43

      Pages: 563-568

  • [Journal Article] Analysis of hunger-driven gene expression in Drosophila melanogaster larval central nervous system.2008

    • Author(s)
      Ryuda, M., Shimada, K., Koyanagi, R., Azumi, K., Tanimura, T., Hayakawa, Y.
    • Journal Title

      Zool. Sci. 25

      Pages: 746-752

  • [Journal Article] Insect cytokine growth-blocking peptide signaling cascades regulate two separate groups of target genes.2008

    • Author(s)
      Ninomiya, Y., Kurakake, M., Oda, Y., Tsuzuki, S., Hayakawa, Y.
    • Journal Title

      FEBS J. 275

      Pages: 894-902

  • [Journal Article] Insect cytokine, growth-blocking peptide, is a primary regulator of melanin-synthesis enzymes in armyworm larval cuticle.2007

    • Author(s)
      Ninomiya, Y., Hayakawa, Y.
    • Journal Title

      FEBS J. 274

      Pages: 1768-1777

  • [Journal Article] Insect cytokine growth-blocking peptide (GBP) regulates insect development.2006

    • Author(s)
      Hayakawa, Y.
    • Journal Title

      Appl. Entomol. Zool. 41

      Pages: 545-554

  • [Journal Article] N-Terminal Mutational Analysis of the Interaction Between Growth-Blocking Peptide (GBP) and Receptor of Insect Immune Cells.2006

    • Author(s)
      Watanabe, S., Tada, M., Aizawa, T., Yoshida, M., Sugaya, T., Taguchi, M., Kouno, T., Nakamura, T., Mizuguchi, M., Demura, M. Hayakawa, Y., Kawano, K.
    • Journal Title

      Protein & Peptide Letters 13

      Pages: 815-822

  • [Journal Article] Mechanisms of black and white stripe pattern formation in the cuticles of insect larvae.2006

    • Author(s)
      Ninomiya, Y., Tanaka, K., Hayakawa, Y.
    • Journal Title

      J. Insect Physiol. 52

      Pages: 638-645

  • [Presentation] 寄生蜂の毒液が宿主ショウジョウバエに及ぼす致死作用2010

    • Author(s)
      降幡駿介、早川洋一
    • Organizer
      日本応用動物昆虫学会
    • Place of Presentation
      千葉
    • Year and Date
      2010-03-26
  • [Presentation] 新規サイトカインの構造と生理機能2009

    • Author(s)
      早川洋一
    • Organizer
      日本生化学会
    • Place of Presentation
      神戸
    • Year and Date
      2009-10-28
  • [Presentation] 昆虫サイトカインの構造と生理機能2009

    • Author(s)
      早川洋一
    • Organizer
      日本農芸化学会
    • Place of Presentation
      福岡
    • Year and Date
      2009-03-28
  • [Presentation] Insect cytokine regulating innate immune defences.2008

    • Author(s)
      早川洋一
    • Organizer
      生物物理学会
    • Place of Presentation
      福岡
    • Year and Date
      2008-12-20
  • [Presentation] 細菌感染によるP77のリン酸化2008

    • Author(s)
      松本均、早川洋一
    • Organizer
      日本動物学会
    • Place of Presentation
      福岡
    • Year and Date
      2008-09-28
  • [Presentation] コクヌストモドキの擬死行動誘発に関連する遺伝子解析2008

    • Author(s)
      田崎彩子、早川洋一
    • Organizer
      日本動物学会
    • Place of Presentation
      福岡
    • Year and Date
      2008-09-28
  • [Presentation] イロショウジョウバエの食性・摂食行動に関わるCG33071遺伝子の解析2008

    • Author(s)
      龍田勝輔、早川洋一
    • Organizer
      日本動物学会
    • Place of Presentation
      福岡
    • Year and Date
      2008-09-28
  • [Presentation] 昆虫の食性決定に関与する遺伝子の解析2007

    • Author(s)
      龍田勝輔、早川洋一
    • Organizer
      日本応用動物昆虫学会
    • Place of Presentation
      広島
    • Year and Date
      2007-03-28
  • [Presentation] ホームページ等

    • Author(s)
      http://extwww. cc. saga-u. ac. jp/~hayakayo /FRAME/index. html

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Published: 2011-06-18   Modified: 2016-04-21  

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