2025/01/20 更新

写真a

タキヤマ ユミ
滝山 由美
TAKIYAMA Yumi
所属
医学部 医学科 臨床医学講座 内科学講座(内分泌・代謝・膠原病内科学分野)
外部リンク

学位

  • 医学博士 ( 旭川医科大学 )

研究キーワード

  • 糖尿病腎症

研究分野

  • ライフサイエンス / 代謝、内分泌学

所属学協会

▼全件表示

留学歴

  • 1995年5月 - 1996年7月   ジョンス・ホプキンス大学   Post-doctral fellowship

論文

  • A natural Nrf2 activator glucoraphanin improves hepatic steatosis in high-fat diet-induced obese male mice associated with AMPK activation

    Suratsawadee Promsuwan, Kazuki Sawamoto, Liang Xu, Mayumi Nagashimada, Naoto Nagata, Yumi Takiyama

    Diabetology International   2023年8月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Science and Business Media LLC  

    DOI: 10.1007/s13340-023-00658-6

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    その他リンク: https://link.springer.com/article/10.1007/s13340-023-00658-6/fulltext.html

  • A maternal high-fat diet induces fetal origins of NASH-HCC in mice. 国際誌

    Takao Takiyama, Toshihiro Sera, Masanori Nakamura, Masato Hoshino, Kentaro Uesugi, Shin-Ichi Horike, Makiko Meguro-Horike, Ryoichi Bessho, Yuri Takiyama, Hiroya Kitsunai, Yasutaka Takeda, Kazuki Sawamoto, Naoto Yagi, Yuji Nishikawa, Yumi Takiyama

    Scientific reports   12 ( 1 )   13136 - 13136   2022年7月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Maternal overnutrition affects offspring susceptibility to nonalcoholic steatohepatitis (NASH). Male offspring from high-fat diet (HFD)-fed dams developed a severe form of NASH, leading to highly vascular tumor formation. The cancer/testis antigen HORMA domain containing protein 1 (HORMAD1), one of 146 upregulated differentially expressed genes in fetal livers from HFD-fed dams, was overexpressed with hypoxia-inducible factor 1 alpha (HIF-1alpha) in hepatoblasts and in NASH-based hepatocellular carcinoma (HCC) in offspring from HFD-fed dams at 15 weeks old. Hypoxia substantially increased Hormad1 expression in primary mouse hepatocytes. Despite the presence of three putative hypoxia response elements within the mouse Hormad1 gene, the Hif-1alpha siRNA only slightly decreased hypoxia-induced Hormad1 mRNA expression. In contrast, N-acetylcysteine, but not rotenone, inhibited hypoxia-induced Hormad1 expression, indicating its dependency on nonmitochondrial reactive oxygen species production. Synchrotron-based phase-contrast micro-CT of the fetuses from HFD-fed dams showed significant enlargement of the liver accompanied by a consistent size of the umbilical vein, which may cause hypoxia in the fetal liver. Based on these findings, a maternal HFD induces fetal origins of NASH/HCC via hypoxia, and HORMAD1 is a potential therapeutic target for NASH/HCC.

    DOI: 10.1038/s41598-022-17501-8

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  • Nrf2活性化剤によるTFAM活性化とSTING抑制作用

    別所 瞭一, 滝山 貴央, Promsuwan Suratsawadee, 宿田 夕季, 橘内 博哉, 澤本 一樹, 竹田 安孝, 坂上 英充, 滝山 由美

    糖尿病   64 ( Suppl.1 )   I - 3   2021年5月

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    担当区分:最終著者   記述言語:日本語   出版者・発行元:(一社)日本糖尿病学会  

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  • Hypoxia-inducible factor-1α is the therapeutic target of the SGLT2 inhibitor for diabetic nephropathy. 国際誌

    Ryoichi Bessho, Yumi Takiyama, Takao Takiyama, Hiroya Kitsunai, Yasutaka Takeda, Hidemitsu Sakagami, Tsuguhito Ota

    Scientific reports   9 ( 1 )   14754 - 14754   2019年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Previous studies have demonstrated intrarenal hypoxia in patients with diabetes. Hypoxia-inducible factor (HIF)-1 plays an important role in hypoxia-induced tubulointerstitial fibrosis. Recent clinical trials have confirmed the renoprotective action of SGLT2 inhibitors in diabetic nephropathy. We explored the effects of an SGLT2 inhibitor, luseogliflozin on HIF-1α expression in human renal proximal tubular epithelial cells (HRPTECs). Luseogliflozin significantly inhibited hypoxia-induced HIF-1α protein expression in HRPTECs. In addition, luseogliflozin inhibited hypoxia-induced the expression of the HIF-1α target genes PAI-1, VEGF, GLUT1, HK2 and PKM. Although luseogliflozin increased phosphorylated-AMP-activated protein kinase α (p-AMPKα) levels, the AMPK activator AICAR did not changed hypoxia-induced HIF-1α expression. Luseogliflozin suppressed the oxygen consumption rate in HRPTECs, and subsequently decreased hypoxia-sensitive dye, pimonidazole staining under hypoxia, suggesting that luseogliflozin promoted the degradation of HIF-1α protein by redistribution of intracellular oxygen. To confirm the inhibitory effect of luseogliflozin on hypoxia-induced HIF-1α protein in vivo, we treated male diabetic db/db mice with luseogliflozin for 8 to 16 weeks. Luseogliflozin attenuated cortical tubular HIF-1α expression, tubular injury and interstitial fibronectin in db/db mice. Together, luseogliflozin inhibits hypoxia-induced HIF-1α accumulation by suppressing mitochondrial oxygen consumption. The SGLT2 inhibitors may protect diabetic kidneys by therapeutically targeting HIF-1α protein.

    DOI: 10.1038/s41598-019-51343-1

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  • Two sibling cases of mitochondrial diabetes mellitus presented with different clinical courses and related complications

    Tomoe Abe, Yasutaka Takeda, Ryoichi Bessho, Kentaro Sakai, Tomonobu Nakamura, Tsuyoshi Yanagimachi, Hidemitsu Sakagami, Yukihiro Fujita, Atsuko Abiko, Yumi Takiyama, Tsuguhito Ota

    Journal of the Japan Diabetes Society   62 ( 3 )   162 - 169   2019年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japan Diabetes Society  

    A 43-year-old deaf woman who presented with headache and nausea was referred to our department to undergo treatment for diabetic ketoacidosis. She needed basal-bolus insulin treatment because her insulin secretory reserve was severely reduced. Mitochondrial diabetes mellitus (MDM) was suspect based on her sensorineural deafness and a maternal family history of diabetes. Because a mitochondrial DNA 3243 A&gt
    G mutation was detected in her blood leukocytes, she was diagnosed with MDM. Although there was no evidence of diabetic microangiopathy, she exhibited atrophy of both the occipital lobe of the cerebrum and cerebellum associated with an m.3243A&gt
    G mutation. Her 41-year-old younger sister was also deaf and was previously diagnosed with diabetes. The younger sister's treatment course differed in that she was treated with oral glucose-lowering agents. She also had an m.3243A&gt
    G mutation and was diagnosed with MDM. Her manifestations were differed from her sister's in that she had renal dysfunction and cardiomyopathy. The clinical manifestations in patients with mitochondrial disease vary because heteroplasmy levels of m.3243A&gt
    G mutation are divergent in organs and tissues. We report sibling cases of MDM that presented with distinct clinical manifestations.

    DOI: 10.11213/tonyobyo.62.162

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  • Impacts of Diabetes and an SGLT2 Inhibitor on the Glomerular Number and Volume in db/db Mice, as Estimated by Synchrotron Radiation Micro-CT at SPring-8. 査読 国際誌

    Takiyama Y, Sera T, Nakamura M, Ishizeki K, Saijo Y, Yanagimachi T, Maeda M, Bessho R, Takiyama T, Kitsunai H, Sakagami H, Fujishiro D, Fujita Y, Makino Y, Abiko A, Hoshino M, Uesugi K, Yagi N, Ota T, Haneda M

    EBioMedicine   36   329 - 346   2018年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    添付ファイル: PIIS2352396418304079.pdf

    DOI: 10.1016/j.ebiom.2018.09.048

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  • SGLT2阻害薬ルセオグリフロジンは、近位尿細管細胞における低酸素誘導HIF-1発現を抑制する

    別所 瞭一, 滝山 由美, 酒井 健太郎, 阿部 智絵, 中村 知伸, 柳町 剛司, 竹田 安孝, 坂上 英充, 藤田 征弘, 安孫子 亜津子, 太田 嗣人

    糖尿病   61 ( Suppl.1 )   S - 383   2018年4月

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    担当区分:責任著者   記述言語:日本語   出版者・発行元:(一社)日本糖尿病学会  

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  • Dipeptidyl peptidase-4 inhibitor treatment induces a greater increase in plasma levels of bioactive GIP than GLP-1 in non-diabetic subjects 査読

    Tsuyoshi Yanagimachi, Yukihiro Fujita, Yasutaka Takeda, Jun Honjo, Hidemitsu Sakagami, Hiroya Kitsunai, Yumi Takiyama, Atsuko Abiko, Yuichi Makino, Timothy J. Kieffer, Masakazu Haneda

    MOLECULAR METABOLISM   6 ( 2 )   226 - 231   2017年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Objective: Glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) possess multiple bioactive isoforms that are rendered non-insulinotropic by the enzyme dipeptidyl peptidase-4 (DPP-4). Recently, some ELISA kits have been developed to specifically measure " active" GIP and GLP-1, but it is unclear if these kits can accurately quantify all bioactive forms. Therefore, it remains uncertain to what extent treatment with a DPP-4 inhibitor boosts levels of biologically active GIP and GLP-1. Thus, we evaluated our novel receptor-mediated incretin bioassays in comparison to commercially available ELISA kits using plasma samples from healthy subjects before and after DPP-4 inhibitor administration.
    Methods: We utilized cell lines stably co-transfected with human GIP or GLP-1 receptors and a cAMP-inducible luciferase expression construct for the bioassays and commercially available ELISA kits. Assays were tested with synthetic GIP and GLP-1 receptor agonists and plasma samples collected from subjects during a 75 g oral glucose tolerance test (OGTT) performed before or following 3-day administration of a DPP-4 inhibitor.
    Results: A GIP isoform GIP(1e30) NH2 increased luciferase activity similarly to GIP(1e42) in the GIP bioassay but was not detectable by either a total or active GIP ELISA kit. During an OGTT, total GIP levels measured by ELISA rapidly increased from 0 min to 15 min, subsequently reaching a peak of 59.2 +/- 8.3 pmol/l at 120 min. In contrast, active GIP levels measured by the bioassay peaked at 15 min (43.4 +/- 6.4 pmol/l) and then progressively diminished at all subsequent time points. Strikingly, at 15 min, active GIP levels as determined by the bioassay reached levels approximately 20-fold higher after the DPP-4 inhibitor treatment, while total and active GIP levels determined by ELISA were increased just 1.5 and 2.1-fold, respectively. In the absence of DPP-4 inhibition, total GLP-1 levels measured by ELISA gradually increased up to 90 min, reaching 23.5 +/- 2.4 pmol/l, and active GLP-1 levels determined by the bioassay did not show any apparent peak. Following administration of a DPP-4 inhibitor there was an observable peak of active GLP-1 levels as determined by the bioassay at 15 min after oral glucose load, reaching 11.0 +/- 0.62 pmol/l, 1.4-fold greater than levels obtained without DPP-4 inhibitor treatment. In contrast, total GLP-1 levels determined by ELISA were decreased after DPP-4 inhibitor treatment.
    Conclusion: Our results using bioassays indicate that there is a greater increase in plasma levels of bioactive GIP than GLP-1 in subjects treated with DPP-4 inhibitors, which may be unappreciated using conventional ELISAs. (C) 2016 The Authors. Published by Elsevier GmbH. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

    DOI: 10.1016/j.molmet.2016.12.009

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  • Sodium-Glucose Cotransporter 2 Inhibitor and a Low Carbohydrate Diet Affect Gluconeogenesis and Glycogen Content Differently in the Kidney and the Liver of Non-Diabetic Mice 査読

    Kuralay Atageldiyeva, Yukihiro Fujita, Tsuyoshi Yanagimachi, Katsutoshi Mizumoto, Yasutaka Takeda, Jun Honjo, Yumi Takiyama, Atsuko Abiko, Yuichi Makino, Masakazu Haneda

    PLOS ONE   11 ( 6 )   e0157672.   2016年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PUBLIC LIBRARY SCIENCE  

    A low carbohydrate diet (LCHD) as well as sodium glucose cotransporter 2 inhibitors (SGLT2i) may reduce glucose utilization and improve metabolic disorders. However, it is not clear how different or similar the effects of LCHD and SGLT2i are on metabolic parameters such as insulin sensitivity, fat accumulation, and especially gluconeogenesis in the kidney and the liver. We conducted an 8-week study using non-diabetic mice, which were fed ad-libitum with LCHD or a normal carbohydrate diet (NCHD) and treated with/without the SGLT-2 inhibitor, ipragliflozin. We compared metabolic parameters, gene expression for transcripts related to glucose and fat metabolism, and glycogen content in the kidney and the liver among the groups. SGLT2i but not LCHD improved glucose excursion after an oral glucose load compared to NCHD, although all groups presented comparable non-fasted glycemia. Both the LCHD and SGLT2i treatments increased calorie-intake, whereas only the LCHD increased body weight compared to the NCHD, epididimal fat mass and developed insulin resistance. Gene expression of certain gluconeogenic enzymes was simultaneously upregulated in the kidney of SGLT2i treated group, as well as in the liver of the LCHD treated group. The SGLT2i treated groups showed markedly lower glycogen content in the liver, but induced glycogen accumulation in the kidney. We conclude that LCHD induces deleterious metabolic changes in the non-diabetic mice. Our results suggest that SGLT2i induced gluconeogenesis mainly in the kidney, whereas for LCHD it was predominantly in the liver.

    DOI: 10.1371/journal.pone.0157672

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  • Alternative form of glucose-dependent insulinotropic polypepide and its physiology 査読

    Yukihiro Fujita, Tsuyoshi Yanagimachi, Yasutaka Takeda, Jun Honjo, Yumi Takiyama, Atsuko Abiko, Yuichi Makino, Masakazu Haneda

    JOURNAL OF DIABETES INVESTIGATION   7   33 - 37   2016年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    Glucose-dependent insulinotropic polypepide (GIP) was first extracted from porcine gut mucosa and identified as incretin decades ago. Though early studies have shown the possible GIP isoforms by gel filtration profiles from porcine or human intestinal extracts analyzed by radioimmunoassay (RIA), GIP is currently believed to consist of 42 amino acids (GIP1-42), which are released from gut K-cells and promote postprandial insulin release. In fact, GIP1-42 is usually processed from proGIP by the action of prohormone convertase (PC) 1/3 in the gut. GIP expression is occasionally found in the intestinal glucagon-like peptide-1-secreting cells, suggesting gene expression of both GIP and proglucagon can co-exist in identical cells. However, GIP1-42 immunoreactivity is rarely found in -cells or other pancreatic endocrine cells of wild-type mammals. Interestingly, we found that short-form GIP1-30 is expressed in and released from pancreatic -cells and a subset of enteroendocrine cells through proGIP processing by PC2. GIP1-30 is also insulinotropic and modulates glucose-stimulated insulin secretion in a paracrine manner. It is also suggested that short-form GIP1-30 possibly plays a crucial role for the islet development. It has not been well elucidated whether expression of GIP1-30 is modulated in the diabetic status, and whether GIP1-30 might have therapeutic potentials. Our preliminary data suggest that short-form GIP1-30 might play important roles in glucose metabolism.

    DOI: 10.1111/jdi.12445

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  • High glucose induces platelet-derived growth factor-C via carbohydrate response element-binding protein in glomerular mesangial cells 査読

    Hiroya Kitsunai, Yuichi Makino, Hidemitsu Sakagami, Katsutoshi Mizumoto, Tsuyoshi Yanagimachi, Kuralay Atageldiyeva, Yasutaka Takeda, Yukihiro Fujita, Atsuko Abiko, Yumi Takiyama, Masakazu Haneda

    Physiological Reports   4 ( 6 )   1 - 13   2016年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Wiley-Blackwell Publishing Ltd  

    Persistent high concentration of glucose causes cellular stress and damage in diabetes via derangement of gene expressions. We previously reported high glucose activates hypoxia-inducible factor-1α and downstream gene expression in mesangial cells, leading to an extracellular matrix expansion in the glomeruli. A glucose-responsive transcription factor carbohydrate response element-binding protein (ChREBP) is a key mediator for such perturbation of gene regulation. To provide insight into glucose-mediated gene regulation in mesangial cells, we performed chromatin immunoprecipitation followed by DNA microarray analysis and identified platelet-derived growth factor-C (PDGF-C) as a novel target gene of ChREBP. In streptozotocin-induced diabetic mice, glomerular cells showed a significant increase in PDGF-C expression
    the ratio of PDGF-C-positive cells to the total number glomerular cells demonstrated more than threefold increase when compared with control animals. In cultured human mesangial cells, high glucose enhanced expression of PDGF-C protein by 1.9-fold. Knock-down of ChREBP abrogated this induction response. Upregulated PDGF-C contributed to the production of type IV and type VI collagen, possibly via an autocrine mechanism. Interestingly, urinary PDGF-C levels in diabetic model mice were significantly elevated in a fashion similar to urinary albumin. Taken together, we hypothesize that a high glucose-mediated induction of PDGF-C via ChREBP in mesangial cells contributes to the development of glomerular mesangial expansion in diabetes, which may provide a platform for novel predictive and therapeutic strategies for diabetic nephropathy.

    DOI: 10.14814/phy2.12730

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  • Role of IGFBP7 in Diabetic Nephropathy: TGF-β1 Induces IGFBP7 via Smad2/4 in Human Renal Proximal Tubular Epithelial Cells. 査読

    Watanabe J, Takiyama Y, Honjyo J, Makino Y, Fujita Y, Tateno M, Haneda M

    PLoS One.   11 ( 3 )   e0150897.   2016年3月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1371/journal.pone.0150897

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  • Pancreatic glucose-dependent insulinotropic polypeptide (GIP) (1-30) expression is upregulated in diabetes and PEGylated GIP(1-30) can suppress the progression of low-dose-STZ-induced hyperglycaemia in mice 査読

    Tsuyoshi Yanagimachi, Yukihiro Fujita, Yasutaka Takeda, Jun Honjo, Kuralay K. Atageldiyeva, Yumi Takiyama, Atsuko Abiko, Yuichi Makino, Timothy J. Kieffer, Masakazu Haneda

    DIABETOLOGIA   59 ( 3 )   533 - 541   2016年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    Aims/hypothesis Glucose-dependent insulinotropic polypeptide (GIP) is a peptide hormone released from gut K cells. While the predominant form is GIP(1-42), a shorter form, GIP(1-30), is produced by pancreatic alpha cells and promotes insulin secretion in a paracrine manner. Here, we elucidated whether GIP(1-30) expression is modulated in mouse models of diabetes. We then investigated whether PEGylated GIP(1-30) can improve islet function and morphology as well as suppress the progression to hyperglycaemia in mice treated with low-dose streptozotocin (LD-STZ).
    Methods We examined pancreatic GIP immunoreactivity in rodent diabetic models. We synthesised [D-Ala(2)]GIP(1-30) and modified the C-terminus with polyethylene glycol (PEG) to produce a dipeptidyl peptidase-4 (DPP-4)-resistant long-acting GIP analogue, [D-Ala(2)]GIP(1-30)-PEG. We performed i.p.GTT and immunohistochemical analysis in nondiabetic and LD-STZ diabetic mice, with or without administration of [D-Ala(2)]GIP(1-30)-PEG.
    Results Pancreatic GIP expression was concomitantly enhanced with alpha cell expansion in rodent models of diabetes. Treatment with DPP-4 inhibitor decreased both the GIP-and glucagon-positive areas and preserved the insulin-positive area in LD-STZ diabetic mice. Body weight was not affected by [D-Ala(2)]GIP(1-30)-PEG in LD-STZ or non-diabetic mice. Treatment with GIP significantly ameliorated chronic hyperglycaemia and improved glucose excursions in LD-STZ mice. Treatment with GIP also reduced alpha cell expansion in the islets and suppressed plasma glucagon levels compared with non-treated LD-STZ mice. Additionally, [D-Ala2] GIP(1-30)-PEG preserved beta cell area via inhibition of apoptosis in LD-STZ mice.
    Conclusions/interpretation Our data suggest that GIP(1-30) expression is upregulated in diabetes, and PEGylated GIP(1-30) can suppress the progression to STZ-induced hyperglycaemia by inhibiting beta cell apoptosis and alpha cell expansion.

    DOI: 10.1007/s00125-015-3842-y

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  • SGLT2阻害薬の腎保護効果についての検討

    滝山 由美, 前田 愛実, Atageldiyeva Kuralay K., 柳町 剛司, 本庄 潤, 藤田 征弘, 羽田 勝計

    糖尿病合併症   28 ( Suppl.1 )   141 - 141   2014年9月

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    担当区分:筆頭著者, 責任著者   記述言語:日本語   出版者・発行元:(一社)日本糖尿病合併症学会  

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  • Implication of intracellular localization of transcriptional repressor PLZF in thyroid neoplasms. 査読

    Matsuzawa K, Izawa S, Ohkura T, Ohkura H, Ishiguro K, Yoshida A, Takiyama Y, Haneda M, Shigemasa C, Yamamoto K, Taniguchi S

    BMC Endocr Disord.   306 ( 9 )   E1065 - E1076   2014年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1186/1472-6823-14-52

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  • Loss of HIF-1α impairs GLUT4 translocation and glucose uptake by the skeletal muscle cells. 査読

    Sakagami H, Makino Y, Mizumoto K, Isoe T, Takeda Y, Watanabe J, Fujita Y, Takiyama Y, Abiko A, Haneda M

    Am J Physiol Endocrinol Metab.   306 ( 9 )   E1065 - E1076   2014年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1152/ajpendo.00597.2012

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  • Hypoxia in Diabetic Kidneys 招待 査読

    Yumi Takiyama, Masakazu Haneda

    BIOMED RESEARCH INTERNATIONAL   2014   837421.   2014年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:HINDAWI PUBLISHING CORPORATION  

    Diabetic nephropathy (DN) is now a leading cause of end-stage renal disease. In addition, DN accounts for the increased mortality in type 1 and type 2 diabetes, and then patients without DN achieve long-term survival compatible with general population. Hypoxia represents an early event in the development and progression of DN, and hypoxia-inducible factor-(HIF-) 1 mediates the metabolic responses to renal hypoxia. Diabetes induces the "fraternal twins" of hypoxia, that is, pseudohypoxia and hypoxia. The kidneys are susceptible to hyperoxia because they accept 20% of the cardiac output. Therefore, the kidneys have specific vasculature to avoid hyperoxia, that is, AV oxygen shunting. The NAD-dependent histone deacetylases (HDACs) sirtuins are seven mammalian proteins, SIRTs 1-7, which are known to modulate longevity and metabolism. Recent studies demonstrated that some isoforms of sirtuins inhibit the activation of HIF by deacetylation or noncatalyzing effects. The kidneys, which have a vascular system that protects them against hyperoxia, unfortunately experience extraordinary hypernutrition today. Then, an unexpected overload of glucose augments the oxygen consumption, which ironically results in hypoxia. This review highlights the primary role of HIF in diabetic kidneys for the metabolic adaptation to diabetes-induced hypoxia.

    DOI: 10.1155/2014/837421

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  • Reduction of both beta cell death and alpha cell proliferation by dipeptidyl peptidase-4 inhibition in a streptozotocin-induced model of diabetes in mice 査読

    Y. Takeda, Y. Fujita, J. Honjo, T. Yanagimachi, H. Sakagami, Y. Takiyama, Y. Makino, A. Abiko, T. J. Kieffer, M. Haneda

    DIABETOLOGIA   55 ( 2 )   404 - 412   2012年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    Incretins stimulate insulin secretion in a glucose-dependent manner but also promote pancreatic beta cell protection. Dipeptidyl peptidase-4 (DPP-4) inhibitors are a new glucose-lowering treatment that blocks incretin degradation by DPP-4. We assessed whether DPP-4 inhibition suppresses the progression to hyperglycaemia in a low-dose streptozotocin (STZ)-induced diabetic mouse model, and then investigated how DPP-4 inhibition affects islet function and morphology.
    The DPP-4 inhibitor, des-fluoro-sitagliptin (SITA), was administered to mice during and after STZ injections, and in some mice also before STZ.
    In control mice, STZ resulted in hyperglycaemia associated with impaired insulin secretion and excess glucagon secretion. In SITA-treated STZ mice, these metabolic abnormalities were improved, particularly when SITA administration was initiated before STZ injections. We observed beta cell loss and dramatic alpha cell expansion associated with decreased insulin content and increased glucagon content after STZ administration. In SITA-treated mice, islet architecture and insulin content were preserved, and no significant increase in glucagon content was observed. After STZ exposure, beta cell apoptosis increased before hyperglycaemia, and SITA treatment reduced the number of apoptotic beta cells. Interestingly, alpha cell proliferation was observed in non-treated mice after STZ injection, but the proliferation was not observed in SITA-treated mice.
    Our results suggest that the ability of DPP-4 inhibition to suppress the progression to STZ-induced hyperglycaemia involves both alleviation of beta cell death and alpha cell proliferation.

    DOI: 10.1007/s00125-011-2365-4

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  • Tubular injury in a rat model of type 2 diabetes is prevented by metformin: a possible role of HIF-1α expression and oxygen metabolism. 査読

    Takiyama Y, Harumi T, Watanabe J, Fujita Y, Honjo J, Shimizu N, Makino Y, Haneda M

    Diabetes.   60 ( 3 )   981 - 992   2011年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2337/db10-0655

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  • 右副腎腺腫合併のpreclinical Cushing's diseaseの一例

    滝山 由美, 安孫子 亜津子, 藤田 征弘, 羽田 勝計

    日本内分泌学会雑誌   86 ( 3 )   713 - 713   2010年12月

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    担当区分:筆頭著者, 責任著者   記述言語:日本語   出版者・発行元:(一社)日本内分泌学会  

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  • Upregulated IL-18 expression in type 2 diabetic subjects with nephropathy: TGF-beta(1) enhanced IL-18 expression in human renal proximal tubular epithelial cells 査読

    Kazunari Miyauchi, Yumi Takiyama, Jun Honjyo, Masatoshi Tateno, Masakazu Haneda

    DIABETES RESEARCH AND CLINICAL PRACTICE   83 ( 2 )   190 - 199   2009年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER IRELAND LTD  

    Aim: In order to clarify the importance of Interleukin (IL)-18 in the development of diabetic nephropathy (DN), we evaluated the expressions of IL-18 in diabetic kidney.
    Methods: We per-formed immmunohistochemical analysis of IL-18 and IL-18 receptor (IL-18 R) in human kidney tissue derived from 12 subjects with type 2 diabetes and overt nephropathy, and compared with those in 7 subjects with minimal change nephrotic syndrome (MCNS). In addition, we examined the regulation of IL-18 expression using human renal proximal tubular epithelial cells (HRPTECs) in culture.
    Results: IL-18 expression in tubular cells was observed in higher rate (83%) in patients with diabetes, whereas one positive specimen (14.3%) for IL-18 in patients with MCNS. In contrast, IL-18 R was expressed in glomerular mesangial cells and endothelial cells as well as tubular cells, similarly in almost of both groups. Exposure to transforming growth factor beta (TGF-beta(1)) led to two-fold increase in IL-18 gene expression in HRPTECs, and mitogen-activated protein kinases (MAPK) inhibitors abolished TGF-beta(1)-induced IL-18 mRNA expression. Western blot analysis showed the IL-18 protein in HRPTECs.
    Conclusion: The present data indicate that IL-18 is overexpressed in human tubular epithelial cells in diabetic nephropathy, probably through the activation of MAPK pathways induced by TGF-beta(1). (C) 2008 Elsevier Ireland Ltd. All rights reserved.

    DOI: 10.1016/j.diabres.2008.11.018

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  • Decreased expression of retinoid X receptor isoforms in human thyroid carcinomas 査読

    Y Takiyama, N Miyokawa, A Sugawara, S Kato, K Ito, K Sato, K Oikawa, H Kobayashi, S Kimura, M Tateno

    JOURNAL OF CLINICAL ENDOCRINOLOGY & METABOLISM   89 ( 11 )   5851 - 5861   2004年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ENDOCRINE SOC  

    Retinoid X receptors (RXRs) are ligand-inducible transcription factors that belong to the superfamily of nuclear hormone receptors. Because RXRs heterodimerize with thyroid hormone receptor, retinoic acid receptor, vitamin D(3) receptor, and peroxisome proliferator-activated receptor, they play central roles in regulating a number of signaling pathways. To understand the roles of RXRs in human thyroid carcinogenesis, we have investigated the immunohistochemical expression of RXRs in normal and neoplastic thyroid tissues. Whereas nontumorous human thyroid cells exhibited distinct nuclear staining for the RXRs, thyroid carcinomas showed decreased nuclear expression of all three RXR isoforms. In particular, some thyroid carcinoma cells showed intense RXR-alpha cytoplasmic staining accompanied by decreased immunoreactivity in their nuclei. This subcellular localization of RXR-alpha was confirmed by Western blot analysis, which showed both lower nuclear expression levels of RXR-alpha and a cytosolic presence of RXR-related protein in neoplastic regions. We present here, for the first time, the histological distribution of each RXR protein (alpha, beta, and gamma) in human thyroid follicular cells. In addition, we found that the nuclear expression of RXRs was lower in thyroid carcinomas than in normal tissue. The differential expressions of these RXRs in thyroid carcinomas might be implicated in the pathogenesis of thyroid cancers.

    DOI: 10.1210/jc.2003-032036

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  • Thyroid-stimulating hormone induces interleukin-18 gene expression in FRTL-5 cells: Immunohistochemical detection of interleukin-18 in autoimmune thyroid disease 査読

    Y Takiyama, N Miyokawa, Y Tokusashi, K Ito, S Kato, S Kimura, K Sato, M Katagiri

    THYROID   12 ( 11 )   935 - 943   2002年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:MARY ANN LIEBERT INC PUBL  

    Interleukin (IL)-18 is a cloned cytokine that was identified originally as a factor having potent interferon (IFN)-inducing activity on Kupffer cells. First, we analyzed IL-18 gene expression by reverse transcription-polymerase chain reaction (RT-PCR) in rat thyroid FRTL-5 cells and human thyroid tissue samples. The expression of IL-18 mRNA in FRTL-5 cells was enhanced by thryoid-stimulating hormone (TSH) in a dose-dependent manner. 8-Bromo-cyclic adenosine monophosphate (cAMP) also increased in IL-18 mRNA levels. Furthermore, TGCT clones that exhibited an increase in intracellular cAMP accumulation showed an increased IL-18 mRNA signal when compared to controls. Taken together, these data suggested that the effect of TSH on IL-18 gene expression was mediated by activating protein kinase A. Treatment of FRTL-5 cells with the antithyroid drug, methimazole (MMI), suppressed this stimulatory action of TSH on IL-18 gene expression. Next, we examined IL-18 expression in human thyroid tissue derived from patients with autoimmune thyroid diseases (ATD). RTPCR and immunohistology demonstrated that human thyroid follicular cells expressed IL-18. Especially in thyroid tissue from a patient with Hashimoto's thyroiditis, expression was more diffuse and extensive, generally observed in close relation to a lyrphocytic infiltrate. Also, IL-18 protein was distributed in the same follicles that express Fas-L and HLA-DR. This study is the first to demonstrate the detection of IL-18 in the thyroid gland. The frequent expression of IL-18 in thyrocytes suggests that IL-18 itself might be a secreted immunomodulator in ATD.

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  • Polymerase chain reaction-based microsatellite polymorphism analysis of follicular and Hürthle cell neoplasms of the thyroid 査読

    Segev DL, Saji M, Phillips GS, Westra WH, Takiyama Y, Piantadosi S, Smallridge RC, Nishiyama RH, Udelsman R, Zeiger MA

    J Clin Endocrinol Metab.   83 ( 6 )   2036 - 2042   1998年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1210/jc.83.6.2036

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  • Polymerase chain reaction-based microsatellite analysis of fine-needle aspirations from Hürthle cell neoplasms. 査読

    Takiyama Y, Saji M, Clark DP, Phillips GS, Segev DL, Smallridge RC, Westra WH, Udelsman R, Zeiger MA

    Thyroid.   7 ( 6 )   853 - 857   1997年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Thyroid-specific expression of cholera toxin A1 subunit causes thyroid hyperplasia and hyperthyroidism in transgenic mice 査読

    MA Zeiger, M Saji, Y Gusev, WH Westra, Y Takiyama, WC Dooley, LD Kohn, MA Levine

    ENDOCRINOLOGY   138 ( 8 )   3133 - 3140   1997年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ENDOCRINE SOC  

    Thyroid cell growth and function are regulated by hormones and growth factors binding to cell surface receptors that are coupled via G proteins, Gs and Gq, to the adenylyl cyclase and phospholipase C signal transduction systems, respectively. Activating mutations of the TSH receptor and Gas have been documented in subsets of thyroid neoplasms. To test the oncogenic potential of activated Gels in transgenic mice, we used the cholera toxin Al subunit that constitutively activates G alpha s and used the rat thyroglobulin gene promoter for targeting this transgene (TGCT) to thyroid follicular cells. Three (M1392, F1358, and F1286) of six founders identified were able to transmit the transgene to their offspring and thyroid glands from these mice contained elevated levels of cAMP. Concentrations of serum thyroxine were elevated as early as 2 months of age (M 1392 and F 1286). F1358 mice were euthyroid until 8 months of age, at which time they developed hyperthyroidism. All three TGCT lines developed thyroid hyperplasia independent of their thyroxine levels. DNA image analysis of thyroid follicular cells from both the hyper and euthyroid mice showed that DNA index and ''S+G2/M'' phase were increased compared with normal, changes similar to that seen in poor prognosis human carcinomas. These data suggest that the Gas-adenylyl cyclase-cAMP pathway has an important role in thyroid hyperplasia and the transgenic mouse models reported herein will allow further examination of the role of this pathway in thyroid oncogenesis.

    DOI: 10.1210/en.138.8.3133

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  • Adenoviral infection of thyroid cells: A rationale for gene therapy for metastatic thyroid carcinoma 査読

    MA Zeiger, Y Takiyama, JO Bishop, AR Ellison, M Saji, MA Levine

    SURGERY   120 ( 6 )   921 - 925   1996年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:MOSBY-YEAR BOOK INC  

    Background. Patients with thyroid carcinoma experience excellent long-term survival; however, up to 16% will die of their disease. We have transformed a rat thyroid follicular cell line (FRTL-5) with a gene (TGCT) that mimics a Known mutation associated with thyroid neoplasms. These cells form subcutaneous tumors that metastasize to lung in nude mice.
    Methods, In anticipation of developing gene therapy against this thyroid carcinoma model, we (1) tested whether adenovirus containing the beta-galactosidase gene could infect FRTL-5 cells and. neonatal rat thyroid and (2) evaluated the ability to kill FRTL-5 cells by transfecting them with a transgene in which the thyroglobulin promoter (TG) directed the expression of herpes simplex virus type I thymidine Kinase (HSV1TK) and treating TG-HSV1TK-transfected cells with 5 mu g/ml ganciclovir.
    Results, Nearly 100% of the TG-HSV1TK but only 5% of control cells were killed by addition of ganciclovir. Histochemical staining for beta-galactosidase activity demonstrated infection of FRTL-5 cells and neonatal rat thyroid tissue by adenovirus beta-galactosidase.
    Conclusions, These data demonstrate the feasibility of using adenovirus as vector to infect thyroid cells in vivo and provide a rationale for development of gene therapy for treatment of thyroid cancer.

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  • Effects of bile acids on iodide uptake and deoxyribonucleic acid synthesis in porcine thyroid cells in primary culture 査読

    R Kanri, Y Takiyama, Makino, I

    THYROID   6 ( 5 )   467 - 474   1996年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:MARY ANN LIEBERT INC PUBL  

    The effects of bile acids on iodide uptake and DNA synthesis were studied in cultured porcine thyroid cells. All five bile acids, which are commonly found in serum, chenodeoxycholic acid (CDCA), cholic acid (CA), deoxycholic acid (DCA), lithocholic acid (LCA), and ursodeoxycholic acid (UDCA) dose-dependently inhibited both basal and TSH-induced iodide uptake at concentrations of 25-250 mu M. Since CDCA is one of the two major primary endogenous bile acids, we studied mainly the effects of CDCA. The inhibitory effect of CDCA was detected after 24 h treatment of thyroid cells, and was dependent on the time of exposure up to 72 h. Treatment of thyroid cells with CDCA for 72 h inhibited cAMP production stimulated by 50 mU/L TSH or 0.5 mg/L forskolin and also inhibited iodide uptake induced by 0.5 mM 8-bromo cAMP or 0.5 mg/L forskolin. These results suggest that CDCA inhibits iodide uptake by decreasing cAMP production as well as post-cAMP generation. Bile acids except LCA stimulated [H-3]thymidine incorporation into the thyroid cells by itself, indicating that the inhibitory effect of bile acids on iodide uptake is not due to cytotoxic effect. In conclusion, these findings suggest that the direct inhibition of thyroid function by bile acids might cause hypothyroidism in chronic liver disease.

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  • THE EFFECTS OF HYDROCORTISONE AND RU486 (MIFEPRISTONE) ON IODIDE UPTAKE IN PORCINE THYROID-CELLS IN PRIMARY CULTURE 査読

    Y TAKIYAMA, H TANAKA, Y TAKIYAMA, MAKINO, I

    ENDOCRINOLOGY   135 ( 5 )   1972 - 1979   1994年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ENDOCRINE SOC  

    The effects of hydrocortisone on iodide uptake and DNA synthesis were studied in porcine thyroid cells cultured in phenol red-free medium supplemented with low concentrations (0-1%) of charcoal-stripped fetal calf serum. Hydrocortisone dose-dependently stimulated TSH-induced iodide uptake at physiological concentrations (1-1000 nM), and the minimum detectable dose was 33 nM hydrocortisone. Treatment of thyroid cells with hydrocortisone for 72 h increased cAMP production stimulated by TSH. In addition, this stimulatory effect of hydrocortisone was observed when iodide uptake was induced with 0.25 mM 8-bromo-cAMP. These results suggest that hydrocortisone stimulates iodide uptake, influencing cAMP production and post-cAMP pathways. The synthetic glucocorticoid antagonist RU486 alone had no effect on iodide uptake in porcine thyroid cells; however, along with TSH, RU486 a weak agonist activity. As a glucocorticoid antagonist, RU486 inhibited the stimulatory actions of hydrocortisone on iodide uptake in combination with TSH and also with 8-bromo-cAMP, suggesting a specific effect of hydrocortisone mediated by a glucocorticoid receptor. The effect of hydrocortisone on thyroid cell multiplication was also studied. Hydrocortisone decreased [H-3]thymidine incorporation into DNA slightly but not significantly when the cells were treated with 100 ng/ml insulin-like growth factor-I and hydrocortisone.
    In summary, it has been demonstrated that hydrocortisone directly stimulated the function of porcine thyroid cells at physiological concentrations, by using a glucocorticoid receptor and by affecting cAMP pathways. The data that RU486 inhibited iodide uptake induced by hydrocortisone and TSH propose that monitoring of thyroid function may be necessary if RU486 is been used for a long time.

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MISC

  • Maternal Overnutrition Causes DNA Alkylation in Fetal Liver, Suppresses FasL, and Upregulates HIF-1 Signaling Pathway in Neonatal Liver in Nonalcoholic Steatohepatitis (NASH)-Based Hepatocellular Carcinoma in Offspring

    Takao Takiyama, Ryoichi Bessho, Kazuki Sawamoto, Yumi Takiyama

    DIABETES   69   2020年6月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:AMER DIABETES ASSOC  

    DOI: 10.2337/db20-1845-P

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  • Zinc; HIF-1 Mimetic in Human Renal Proximal Tubular Cells

    Ryoichi Bessho, Yumi Takiyama, Manami Maeda, Kuralay K. Atageldiyeva, Yukihiro Fujita, Masakazu Haneda

    DIABETES   65   A137 - A137   2016年6月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:AMER DIABETES ASSOC  

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  • A New Player in Diabetic Nephropathy: Metallothionein 3 Is a Target for Hypoxia Inducible Factor-1

    Yumi Takiyama, Manami Maeda, Kuralay K. Atageldiyeva, Tsuyoshi Yanagimachi, Jun Honjo, Yukihiro Fujita, Atsuko Abiko, Masakazu Haneda

    DIABETES   64   A142 - A142   2015年6月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:AMER DIABETES ASSOC  

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  • Zinc exerts anti-fibrotic action by inhibiting TGF-beta1-induced type I collagen and fibronectin in human renal proximal tubular cells

    Y. Takiyama, M. Maeda, K. K. Atageldiyeva, T. Yanagimachi, J. Honjo, Y. Fujita, Y. Makino, M. Haneda

    DIABETOLOGIA   57   S480 - S480   2014年9月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:SPRINGER  

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  • SGLT2 Inhibitor Luseogliflozin (TS-071) Protects from Diabetic Nephropathy in an Animal Model of Type 2 Diabetes

    Yumi Takiyama, Ryoichi Bessho, Manami Maeda, Kuralay K. Atageldiyeva, Tsuyoshi Yanagimachi, Jun Honjo, Yukihiro Fujita, Yuichi Makino, Masakazu Haneda

    DIABETES   63   A136 - A136   2014年6月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:AMER DIABETES ASSOC  

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  • Renal Tubulointerstitial Fibrosis in Type 2 Diabetic Rats Is Prevented by Metformin: A Possible Role of HIF-1 alpha Expression and Oxygen Metabolism

    Yumi Takiyama, Jun Watanabe, Tatsuo Harumi, Yukihiro Fujita, Jun Honjyo, Norihiko Shimizu, Yuichi Makino, Yasutaka Takeda, Masakazu Haneda

    DIABETES   59   A249 - A249   2010年6月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:AMER DIABETES ASSOC  

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  • Metformin inhibits HIF-1alpha expression in human anaplastic thyroid cancer cells by suppressing mitochondrial respiration

    Yumi Takiyama, Yukihiro Fujita, Masakazu Haneda

    ENDOCRINE JOURNAL   57   S468 - S468   2010年3月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:JAPAN ENDOCRINE SOC  

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  • Insulin-Like Growth Factor Binding Protein-Related Protein 1 (IG-FBP-rP1) as a Possible Biomarker of Proximal Tubule Injury in Type-2 Diabetic Patients with Proteinuria

    Jun Watanabe, Yumi Takiyama, Jun Honjo, Hidemitu Sakagami, Yuichi Makino, Yasutaka Takeda, Yukihiro Fujita, Masatoshi Tateno, Masakazu Haneda

    DIABETES   58   A216 - A216   2009年6月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:AMER DIABETES ASSOC  

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  • TGF-beta 1 upregulates insulin-like growth factor binding protein (IGFBP)7 expression in human renal proximal tubular epithelial cell (HRPTEC)

    J. Watanabe, Y. Takiyama, I. Honjyo, T. Isoe, H. Sakagami, Y. Makino, Y. Fujita, M. Haneda

    DIABETOLOGIA   51   S480 - S480   2008年9月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:SPRINGER  

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  • Metformin inhibits the expressions of HIF-1 alpha and PAI-1 through the inhibition of mitochondria I respiratory chain complex I in human renal proximal tubular epithelial cells (HRPTECs) in culture

    Yumi Takiyama, Jun Watanabe, Jun Honjyo, Tsubasa Isoe, Hidemitsu Sakagami, Masahiro Fujita, Yuichi Makino, Masakazu Haneda

    DIABETES   57   A215 - A215   2008年6月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:AMER DIABETES ASSOC  

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  • Renoprotective effects of metformin

    Yumi Takiyama, Jun Honjyo, Yuichi Makino, Tsubasa Isoe, Masakazu Haneda

    DIABETES   56   A603 - A604   2007年6月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:AMER DIABETES ASSOC  

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  • Interleukin-18 (IL-18) expression is up-regulated in renal tubular cells in type 2 diabetic subjects with nephropathy

    Yumi Takiyama, Kazunari Miyauchi, Jun Honjyo, Seir Uebori, Tsubasa Isoe, Atsuko Abiko, Hiroshi Ito, Masatoshi Tateno, Masakazu Haneda

    DIABETES   55   A184 - A184   2006年6月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:AMER DIABETES ASSOC  

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共同研究・競争的資金等の研究課題

  • 糖尿病循環障害:血流動態的変動指標の確立

    研究課題/領域番号:22K08301  2022年4月 - 2025年3月

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    滝山 由美, 中村 匡徳, 世良 俊博, 青沼 達也

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    配分額:4,160,000円 ( 直接経費:3,200,000円 、 間接経費:960,000円 )

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  • 糖尿病腎症Fast Decliner:胎内栄養環境説

    研究課題/領域番号:19K08718  2019年4月 - 2022年3月

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    滝山 由美, 中村 匡徳, 世良 俊博, 西川 祐司

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    配分額:4,290,000円 ( 直接経費:3,300,000円 、 間接経費:990,000円 )

    母体の過栄養は、胎生期マウス腎臓体積の有意な増大を呈した。一方、母体通常食群(CD)と母体高脂肪食群(HFD)の胎仔マウス腎臓脈径に有意差を認めなかった。Murrayの法則より、臓器血流は動脈径に比例することから、HFD群の胎仔マウス腎臓は血流量が減少していることが示唆された。低酸素指標であるHIF-1αの免疫組織化学的染色法により、HFD群胎仔マウス腎臓におけるHIF-1α発現増強を認めた。仔マウスの15週齢時の尿中アルブミン排泄量は、両群間で有意差を認めなかったが、4週齢時HFD群仔マウス腎尿細管細胞内には空砲形成を認め、また、15週齢時、腎糸球体硬化、糸球体細動脈の動脈硬化を認めた。

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  • Metallothionein3の糖尿病性腎症における役割の解明

    研究課題/領域番号:15K09372  2015年4月 - 2018年3月

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    滝山 由美, 世良 俊博, 中村 匡徳, 高橋 賢治

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    配分額:4,940,000円 ( 直接経費:3,800,000円 、 間接経費:1,140,000円 )

    本研究は、抗酸化物質メタロチオネイン3(MT3)に着目して、糖尿病腎尿細管細胞における高血糖により惹起される低酸素状態が、低酸素誘導転写因子(Hypoxia inducible factor-1; HIF-1)の発現誘導とともに、新規HIF-1標的遺伝子MT3の過剰発現を介し、逆行性に糸球体結節性病変形成するという仮説のもと、その意義と制御手段を、MT3ゲノムを含むBAC cloneをtransgeneしたヒト化トランスジェニックマウス(BACTGMT3)を用いて解明した。

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  • 2006年12月 -現在
    日本内科学会 総合内科専門医
  • 2005年9月 -現在
    日本内科学学会 認定内科医
  • 2004年7月 -現在
    日本甲状腺学会 認定専門医

▼全件表示