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藤井, 千文 ; Fujii, Chifumi
概要:
取得学位：博士(理学)，学位授与番号：博甲第430号，学位授与年月日：平成13年3月31日,学位授与年：2001
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Fujii, Chifumi ; Morii, Shingo ; Miyoshi, Toshio ; Iwami, Masafumi ; Itagaki, Eiji ; 板垣, 英治
概要:
金沢大学自然科学研究科 <br />金沢大学理工研究域自然システム学系<br />The gene encoding 3-ketosteroid-Δ1-dehydrogenase from Rhodococcus rhodochrous
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was cloned and sequenced. The gene (ksdD) consists of 1,536 nucleotides and encodes an enzyme protein of 511 amino acid residues. The amino terminal methionine residue was deleted in the mature protein. The amino acids involved in the flavin binding site are conserved in the dehydrogenase sequence. The deduced amino acid sequence is highly homologous to that from Arthrobacter simplex but less so to that from Pseudomonas testosteroni. Upstream of the gene was located a heat shock protein gene, dnaJ, and downstream, a gene of a hypothetical protein. The enzyme gene was ligated with an expression vector to construct a plasmid pDEX-3 and introduced into Escherichia coli cells. The transformed cells hyperexpressed the 3-ketosteroid-Δ1-dehydrogenase as an active and soluble protein at more than 30 times the level of R. rhodochrous cells. Purification of the recombinant 3-ketosteroid-Δ1-dehydrogenase from the E. coli cells by a simplified procedure yielded about 13 mg of enzyme protein/liter of the bacterial culture. The purified recombinant dehydrogenase exhibited identical molecular and catalytic properties to the R. rhodochrous enzyme.
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| 3.
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Fujii, Chifumi ; Morii, Shingo ; Kadode, Michiaki ; Sawamoto, Shizue ; Iwami, Masafumi ; Itagaki, Eiji ; 板垣, 英治
概要:
金沢大学自然科学研究科 <br />金沢大学理工研究域自然システム学系<br />Tetranitromethane treatment of 3-ketosteroid-Δ1-dehydrogenase of Rhodococcus r
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hodechrous caused loss of the catalytic activity in a time- and concentration-dependent manner. Peptides (P-81) and (PN-83) were isolated from tryptic digests of the native and tetranitromethane-treated enzyme proteins, respectively. PN-83 was the nitrated form of P-81. The amino acid sequence was GGAPLIDYLESDDDLEFMVYPWPDYFGK (positions 97-124 of the dehydrogenase sequence). PN-83 showed a low yield of PTH-Tyr of position 116, i.e. less than 5% of that of P-81, and instead a high yield of PTH-3-nitrotyrosine. This indicated that tetranitromethane modifies Y-116 under the experimental conditions used. Mutation of Y-104, Y-116, and Y-121 to smaller amino acid residues, Phe, Ser, or Ala, significantly changed the catalytic activity of the dehydrogenase. All of the mutants contained FAD and exhibited the same spectrophotometric properties as those of the wild type enzyme. The K(m) values for 4-androstene-3,17-dione of the Y-104, Y-116, and Y-121 mutants changed to large values. The most drastic change was observed for Y116A. The K(d) values for 1,4-androstadiene-3,17-dione of the Y116 mutants changed to 1.5-2.6-fold larger values than that of the recombinant enzyme. The Y-121 mutant enzymes exhibited catalytic activities like those of the recombinant enzyme, but the catalytic efficiencies of Y121F and Y121A drastically decreased to 0.014-0.054% of that of the recombinant enzyme. The present results indicate that Y-121 plays an important role in the catalytic function, and that Y-116 and Y-104 act on binding of the substrate steroid.
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Yang, Xiaoqin ; Lu, Peirong ; Fujii, Chifumi ; Nakamoto, Yasunari ; Gao, Ji Liang ; Kaneko, Shuichi ; Murphy, Philip M. ; Mukaida, Naofumi
概要:
金沢大学がん研究所がん病態制御<br />We previously observed that a chemokine, macrophage inflammatory protein-1 α/CCL3, and its receptor
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, CCR1, were aberrantly expressed in human hepatocellular carcinoma (HCC) tissues. Here, we show that CCL3 and CCR1 are also expressed in 2 different models of this cancer; N-nitrosodiethylamine (DEN)-induced HCC and HCC induced by hepatitis B virus surface (HBs) antigen-primed splenocyte transfer to myelo-ablated syngeneic HBs antigen transgenic mice. At 10 months after DEN treatment, foci number and sizes were remarkably reduced in CCR1- and CCL3-deficient mice, compared with those of wild-type (WT) mice, although tumor incidence were marginally, but significantly, higher in CCR1- and CCL3-deficient mice than in WT mice. Of note is that tumor angiogenesis was also markedly diminished in CCL3- and CCR1-deficient mice, with a concomitant reduction in the number of intratumoral Kupffer cells, a rich source of growth factors and matrix metalloproteinases (MMPs). Among growth factors and MMPs that we examined, only MMP9 and MMP13 gene expression was augmented progressively in liver of WT mice after DEN treatment. Moreover, MMP9, but not MMP13, gene expression was attenuated in CCR1- and CCL3-deficient mice, compared with that of WT mice. Furthermore, MMP9 was expressed mainly by mononuclear cells but not hepatoma cells, and MMP9-expressing cell numbers were decreased in CCR1- or CCL3-deficient mice, compared with WT mice. These observations suggest the contribution of the CCR1-CCL3 axis to HCC progression. © 2005 Wiley-Liss, Inc.
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Fujii, Chifumi ; Nakamoto, Yasunari ; Lu, Peirong ; Tsuneyama, Koichi ; Popivanova, Boryana K. ; Kaneko, Shuichi ; Mukaida, Naofumi
概要:
金沢大学がん研究所がん病態制御<br />Most cases of human hepatocellular carcinoma develop after persistent chronic infection with human
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hepatitis B virus or hepatitis C virus, and host responses are presumed to have major roles in this process. To recapitulate this process, we have developed the mouse model of hepatocellular carcinoma using hepatitis B virus surface antigen transgenic mice. To identify the genes associated with hepatocarcinogenesis in this model, we compared the gene expression patterns between pre-malignant lesions surrounded by hepatocellular carcinoma tissues and control liver tissues by using a fluorescent differential display analysis. Among the genes that were expressed differentially in the pre-malignant lesions, we focused on Pim-3, a member of a proto-oncogene Pim family, because its contribution to hepatocarcinogenesis remains unknown. Moreover, the unavailability of the nucleotide sequence of full-length human Pim-3 cDNA prompted us to clone it from the cDNA library constructed from a human hepatoma cell line, HepG2. The obtained 2,392 bp human Pim-3 cDNA encodes a predicted open reading frame consisting of 326 amino acids. Pim-3 mRNA was selectively expressed in human hepatoma cell lines, but not in normal liver tissues. Moreover, Pim-3 protein was detected in human hepatocellular carcinoma tissues and cell lines but not in normal hepatocytes. Furthermore, cell proliferation was attenuated and apoptosis was enhanced in human hepatoma cell lines by the ablation of Pim-3 gene with RNA interference. These observations suggest that aberrantly expressed Pim-3 can cause autonomous cell proliferation or prevent apoptosis in hepatoma cell lines. © 2004 Wiley-Liss, Inc.
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Yang, Xiaoqin ; Lu, Peirong ; Ishida, Yuko ; Kuziel, William A. ; Fujii, Chifumi ; Mukaida, Naofumi
概要:
金沢大学がん研究所がん病態制御<br />The liver parenchyma is populated by hepatocytes and several nonparenchymal cell types, including K
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upffer cells and hepatic stellate cells. Both Kupffer cells and hepatic stellate cells are responsive to the chemokine CCL2, but the precise roles of CCL2 and these cells in liver tumor formation remain undefined. Hence, we investigated the effects of the lack of the major CCL2 receptor, CCR2, on liver tumor formation induced by intraportal injection of the murine colon adenocarcinoma cell line, colon 26. Wild-type mice showed macroscopic tumor foci in the liver 10 days after injection of colon 26 cells. After 10 days, CCL2 proteins were detected predominantly in tumor cells, coincident with increased intratumoral macrophage and hepatic stellate cell numbers. Although tumor formation occurred at similar rates in wild-type and CCR2-deficient mice up to 10 days after tumor cell injection, the number and size of tumor foci were significantly attenuated in CCR2-deficient mice relative to wild-type mice thereafter. Moreover, neovascularization and matrix metalloproteinase 2 expression were diminished in CCR2-deficient mice with a concomitant reduction in the accumulation of macrophages and hepatic stellate cells. Furthermore, matrix metalloproteinase 2 was detected predominantly in hepatic stellate cells but not in macrophages. We provided the first definitive evidence that the absence of CCR2-mediated signals can reduce the trafficking of hepatic stellate cells, a main source of matrix metalloproteinase 2, and consequently can diminish neovascularization during liver tumor formation. © 2005 Wiley-Liss, Inc.
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Popivanova, Boryana K. ; Kitamura, Kazuya ; Wu, Yu ; Kondo, Toshikazu ; Kagaya, Takashi ; Kaneko, Shuichi ; Oshima, Masanobu ; Fujii, Chifumi ; Mukaida, Naofumi
概要:
金沢大学がん研究所がん病態制御<br />The inflammatory bowel disease ulcerative colitis (UC) frequently progresses to colon cancer. To un
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derstand the mechanisms by which UC patients develop colon carcinomas, we used a mouse model of the disease whereby administration of azoxymethane (AOM) followed by repeated dextran sulfate sodium (DSS) ingestion causes severe colonic inflammation and the subsequent development of multiple tumors. We found that treating WT mice with AOM and DSS increased TNF-α expression and the number of infiltrating leukocytes expressing its major receptor, p55 (TNF-Rp55), in the lamina propria and submucosal regions of the colon. This was followed by the development of multiple colonic tumors. Mice lacking TNF-Rp55 and treated with AOM and DSS showed reduced mucosal damage, reduced infiltration of macrophages and neutrophils, and attenuated subsequent tumor formation. WT mice transplanted with TNF-Rp55-deficient bone marrow also developed significantly fewer tumors after AOM and DSS treatment than either WT mice or TNF-Rp55-deficient mice transplanted with WT bone marrow. Furthermore, administration of etanercept, a specific antagonist of TNF-α, to WT mice after treatment with AOM and DSS markedly reduced the number and size of tumors and reduced colonic infiltration by neutrophils and macrophages. These observations identify TNF-α as a crucial mediator of the initiation and progression of colitis-associated colon carcinogenesis and suggest that targeting TNF-α may be useful in treating colon cancer in individuals with UC.
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Wu, Yu ; Wang, Ying Ying ; Nakamoto, Yasunari ; Li, Ying-Yi ; Baba, Tomohisa ; Kaneko, Shuichi ; Fujii, Chifumi ; Mukaida, Naofumi
概要:
金沢大学がん研究所<br />Pim-3, a proto-oncogene with serine/threonine kinase activity, was enhanced in hepatocellular carcinoma (
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HCC) tissues. To address the roles of Pim-3 in HCC development, we prepared transgenic mice that express human Pim-3 selectively in liver. The mice were born at a Mendelian ratio, were fertile and did not exhibit any apparent pathological changes in the liver until 1 year after birth. Pim-3-transgenic mouse-derived hepatocytes exhibited accelerated cell cycle progression. The administration of a potent hepatocarcinogen, diethylnitrosamine (DEN), induced accelerated proliferation of liver cells in Pim-3 transgenic mice in the early phase, compared with that observed for wild-type mice. Treatment with DEN induced lipid droplet accumulation with increased proliferating cell numbers 6 months after the treatment. Eventually, wild-type mice developed HCC with a frequency of 40% until 10 month after the treatment. Lipid accumulation was accelerated in Pim-3 transgenic mice with higher proliferating cell numbers, compared with that observed for wild-type mice. Pim-3 transgenic mice developed HCC with a higher incidence (80%) and a heavier burden, together with enhanced intratumoral CD31-positive vascular areas, compared with that observed for wild-type mice. These observations indicate that Pim-3 alone cannot cause, but can accelerate HCC development when induced by a hepatocarcinogen, such as DEN. © 2010 Macmillan Publishers Limited. All rights reserved.
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Popivanova, Boryana Konstantinova ; Li, Ying-Yi ; Zheng, Huachuan ; Omura, Kenji ; Fujii, Chifumi ; Tsuneyama, Koichi ; Mukaida, Naofumi
概要:
金沢大学がん研究所がん病態制御<br />We previously observed that Pim-3 with serine/threonine kinase activity, was aberrantly expressed i
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n malignant lesions of endoderm-derived organs, liver and pancreas. Because Pim-3 protein was not detected in normal colon mucosal tissues, we evaluated Pim-3 expression in malignant lesions of human colon, another endoderm-derived organ. Pim-3 was detected immunohistochemically in well-differentiated (43/68 cases) and moderately differentiated (23/41 cases) but not poorly differentiated colon adenocarcinomas (0/5 cases). Moreover, Pim-3 proteins were detected in adenoma (35/40 cases) and normal mucosa (26/111 cases), which are adjacent to adenocarcinoma. Pim-3 was constitutively expressed in SW480 cells and the transfection with Pim-3 short hairpin RNA promoted apoptosis. In the same cell line, a pro-apoptotic molecule, Bad, was phosphorylated at Ser112 and Ser 136 sites of phosphorylation that are representative of its inactive form. Ser112 but not Ser136 phosphorylation in this cell line was abrogated by Pim-3 knockdown. Furthermore, in human colon cancer tissues, Pim-3 co-localized with Bad in all cases (9/9) and with phospho-Ser112 Bad in most cases (6/9). These observations suggest that Pim-3 can inactivate Bad by phosphorylating its Ser112 in human colon cancer cells and thus may prevent apoptosis and promote progression of human colon cancer. © 2007 Japanese Cancer Association.
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