医学部 内科学講座

久田 修

ヒサタ シユウ  (Shiyuu Hisata)

基本情報

所属
自治医科大学 医学部内科学講座 呼吸器内科学部門 学内准教授

J-GLOBAL ID
201001003707959272
researchmap会員ID
6000022485

外部リンク

MISC

 4
  • 久田 修, 貫和 敏博
    コンセンサス癌治療 へるす出版 2009年  
  • Shu Hisata, Toshihiro Nukiwa
    Consensus of Cancer Therapy,へるす出版 2009年  
  • Shu Hisata, Toshiaki Sakisaka, Takeshi Baba, Tomohiro Yamada, Kazubiro Aoki, Mlchiyuki Matsuda, Yoshimi Takai
    JOURNAL OF CELL BIOLOGY 178(5) 843-860 2007年8月  
    Neurotrophins, such as NGF and BDNF, induce sustained activation of Rap1 small G protein and ERK, which are essential for neurite outgrowth. We show involvement of a GDP/GTP exchange factor (GEF) for Rap1, PDZ-GEFI, in these processes. PDZ-GEF1 is activated by GTP-Rap1 via a positive feedback mechanism. Upon NGF binding, the TrkA neurotrophin receptor is internalized from the cell surface, passes through early endosomes, and arrives in late endosomes. A tetrameric complex forms between PDZ-GEFI, synaptic scaffolding molecule and ankyrin repeat-rich membrane spanning protein which interacts directly with the TrkA receptor. At late endosomes, the complex induces sustained activation of Rap1 and ERK, resulting in neurite outgrowth. In cultured rat hippocampal neurons, PDZ-GEF1 is recruited to late endosomes in a BDNF-dependent manner involved in BDNF-induced neurite outgrowth. Thus, the interaction of PDZ-GEF1 with an internalized neurotrophin receptor transported to late endosomes induces sustained activation of both Rap 1 and ERK and neurite outgrowth.
  • Shu Hisata, Toshiaki Sakisaka, Takeshi Baba, Tomohiro Yamada, Kazubiro Aoki, Mlchiyuki Matsuda, Yoshimi Takai
    JOURNAL OF CELL BIOLOGY 178(5) 843-860 2007年8月  
    Neurotrophins, such as NGF and BDNF, induce sustained activation of Rap1 small G protein and ERK, which are essential for neurite outgrowth. We show involvement of a GDP/GTP exchange factor (GEF) for Rap1, PDZ-GEFI, in these processes. PDZ-GEF1 is activated by GTP-Rap1 via a positive feedback mechanism. Upon NGF binding, the TrkA neurotrophin receptor is internalized from the cell surface, passes through early endosomes, and arrives in late endosomes. A tetrameric complex forms between PDZ-GEFI, synaptic scaffolding molecule and ankyrin repeat-rich membrane spanning protein which interacts directly with the TrkA receptor. At late endosomes, the complex induces sustained activation of Rap1 and ERK, resulting in neurite outgrowth. In cultured rat hippocampal neurons, PDZ-GEF1 is recruited to late endosomes in a BDNF-dependent manner involved in BDNF-induced neurite outgrowth. Thus, the interaction of PDZ-GEF1 with an internalized neurotrophin receptor transported to late endosomes induces sustained activation of both Rap 1 and ERK and neurite outgrowth.