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学位論文 |
学位
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蘭, 菲 ; Lan, Fei
概要:
博士論文要旨Abstract 以下に掲載：Diabetes 63(5) pp.1649-1664 2014. American Diabetes Association. 共著者：Fei Lan, Hirofumi Misu, Keita
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Chikamoto, Hiroaki Takayama, Akihiro Kikuchi, Kensuke Mohri, Noboru Takata, Hiroto Hayashi, Naoto Matsuzawa-Nagata, Yumie Takeshita, Hiroyo Noda, Yukako Matsumoto, Tsuguhito Ota, Toru Nagano, Masatoshi Nakagen, Ken-ichi Miyamoto, Kanako Takatsuki, Toru Seo, Kaito Iwayama, Kunpei Tokuyama, Seiichi Matsugo, Hong Tang, Yoshiro Saito, Satoshi Yamagoe, Shuichi Kaneko, Toshinari Takamura
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| 2.
学位論文 |
学位
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蘭, 菲 ; Lan, Fei
概要:
博士論文本文Full 以下に掲載：Diabetes 63(5) pp.1649-1664 2014. American Diabetes Association. 共著者：Fei Lan, Hirofumi Misu, Keita Chik
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amoto, Hiroaki Takayama, Akihiro Kikuchi, Kensuke Mohri, Noboru Takata, Hiroto Hayashi, Naoto Matsuzawa-Nagata, Yumie Takeshita, Hiroyo Noda, Yukako Matsumoto, Tsuguhito Ota, Toru Nagano, Masatoshi Nakagen, Ken-ichi Miyamoto, Kanako Takatsuki, Toru Seo, Kaito Iwayama, Kunpei Tokuyama, Seiichi Matsugo, Hong Tang, Yoshiro Saito, Satoshi Yamagoe, Shuichi Kaneko, Toshinari Takamura
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| 3.
論文 |
論文
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Lan, Fei ; Misu, Hirofumi ; Chikamoto, Keita ; Takayama, Hiroaki ; Kikuchi, Akihiro ; Mohri, Kensuke ; Takata, Noboru ; Hayashi, Hiroto ; Matsuzawa-Nagata, Naoto ; Takeshita, Yumie ; Noda, Hiroyo ; Matsumoto, Yukako ; Ota, Tsuguhito ; Nagano, Toru ; Nakagen, Masatoshi ; Miyamoto, Ken-ichi ; Takatsuki, Kanako ; Seo, Toru ; Iwayama, Kaito ; Tokuyama, Kunpei ; Matsugo, Seiichi ; Tang, Hong ; Saito, Yoshiro ; Yamagoe, Satoshi ; Kaneko, Shuichi ; Takamura, Toshinari
概要:
Recent articles have reported an association between fatty liver disease and systemic insulin resistance in humans, but
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the causal relationship remains unclear. The liver may contribute to muscle insulin resistance by releasing secretory proteins called hepatokines. Here we demonstrate that leukocyte cell-derived chemotaxin 2 (LECT2), an energy-sensing hepatokine, is a link between obesity and skeletal muscle insulin resistance. Circulating LECT2 positively correlated with the severity of both obesity and insulin resistance in humans. LECT2 expression was negatively regulated by starvation-sensing kinase adenosine monophosphate-activated protein kinase in H4IIEC hepatocytes. Genetic deletion of LECT2 in mice increased insulin sensitivity in the skeletal muscle. Treatment with recombinant LECT2 protein impaired insulin signaling via phosphorylation of Jun NH2-terminal kinase in C2C12 myocytes. These results demonstrate the involvement of LECT2 in glucose metabolism and suggest that LECT2 may be a therapeutic target for obesity-associated insulin resistance. © 2014 by the American Diabetes Association.
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| 4.
論文 |
論文
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Ishikura, Kazuhide ; Misu, Hirofumi ; Kumazaki, Masafumi ; Takayama, Hiroaki ; Matsuzawa-Nagata, Naoto ; Tajima, Natsumi ; Chikamoto, Keita ; Lan, Fei ; Ando, Hitoshi ; Ota, Tsuguhito ; Sakurai, Masaru ; Takeshita, Yumie ; Kato, Kenichiro ; Fujimura, Akio ; Miyamoto, Ken-ichi ; Saito, Yoshiro ; Kameo, Satomi ; Okamoto, Yasuo ; Takuwa, Yoh ; Takahashi, Kazuhiko ; Kidoya, Hiroyasu ; Takakura, Nobuyuki ; Kaneko, Shuichi ; Takamaura, Toshinari
概要:
Aims/hypothesis Impaired angiogenesis induced by vascular endothelial growth factor (VEGF) resistance is a hallmark of v
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ascular complications in type 2 diabetes; however, its molecular mechanism is not fully understood. We have previously identified selenoprotein P (SeP, encoded by the SEPP1 gene in humans) as a liver-derived secretory protein that induces insulin resistance. Levels of serum SeP and hepatic expression of SEPP1 are elevated in type 2 diabetes. Here, we investigated the effects of SeP on VEGF signalling and angiogenesis. Methods We assessed the action of glucose on Sepp1 expression in cultured hepatocytes. We examined the actions of SeP on VEGF signalling and VEGF-induced angiogenesis in HUVECs. We assessed wound healing in mice with hepatic SeP overexpression or SeP deletion. The blood flow recovery after ischaemia was also examined by using hindlimb ischaemia model with Sepp1-heterozygous-knockout mice. Results Treatment with glucose increased gene expression and transcriptional activity for Sepp1 in H4IIEC hepatocytes. Physiological concentrations of SeP inhibited VEGF-stimulated cell proliferation, tubule formation and migration in HUVECs. SeP suppressed VEGF-induced reactive oxygen species (ROS) generation and phosphorylation of VEGF receptor 2 (VEGFR2) and extracellular signal-regulated kinase 1/2 (ERK1/2) in HUVECs. Wound closure was impaired in the mice overexpressing Sepp1, whereas it was improved in SeP-/-mice. SeP+/-mice showed an increase in blood flow recovery and vascular endothelial cells after hindlimb ischaemia. Conclusions/interpretation The hepatokine SeP may be a novel therapeutic target for impaired angiogenesis in type 2 diabetes. © 2014 Springer-Verlag Berlin Heidelberg.
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