1
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Pickering H, Arakawa-Hoyt J, Llamas M, Ishiyama K, Sun Y, Parmar R, Sen S, Schaenman J, Lanier L, Reed E, Calabrese D, Greenland J. CMV-Expanded, Phenotypically Heterogenous CD8 TEMRA Differentially Associate with Viral Control and Allograft Outcomes. J Heart Lung Transplant 2023. [DOI: 10.1016/j.healun.2023.02.1525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023] Open
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2
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Kojima S, Minagawa H, Yoshida C, Inoue E, Takahashi H, Ishiyama K. Coregulation of glutamine synthetase1;2 ( GLN1;2) and NADH-dependent glutamate synthase ( GLT1) gene expression in Arabidopsis roots in response to ammonium supply. Front Plant Sci 2023; 14:1127006. [PMID: 36890884 PMCID: PMC9986259 DOI: 10.3389/fpls.2023.1127006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Accepted: 02/07/2023] [Indexed: 06/18/2023]
Abstract
Ammonium absorbed by roots is assimilated into amino acids. The glutamine synthetase/glutamate synthase (glutamine 2-oxoglutarate aminotransferase) (GS/GOGAT) cycle is essential to this biological process. In Arabidopsis thaliana, GLN1;2 and GLT1 are the GS and GOGAT isoenzymes induced in response to ammonium supply and playing key roles in ammonium utilization. Although recent studies suggest gene regulatory networks involved in transcriptional regulation of ammonium-responsive genes, direct regulatory mechanisms for ammonium-induced expression of GS/GOGAT remain unclear. In this study, we revealed that the expression of GLN1;2 and GLT1 in Arabidopsis is not directly induced by ammonium but is regulated by glutamine or post-glutamine metabolites produced by ammonium assimilation. Previously, we identified a promoter region required for ammonium-responsive expression of GLN1;2. In this study, we further dissected the ammonium-responsive region of the GLN1;2 promoter and also performed a deletion analysis of the GLT1 promoter, which led to the identification of a conserved ammonium-responsive region. Yeast one-hybrid screening using the ammonium-responsive region of the GLN1;2 promoter as a decoy sequence revealed a trihelix family transcription factor DF1 that binds to this region. A putative DF1 binding site was also found in the ammonium-responsive region of the GLT1 promoter.
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Affiliation(s)
- Soichi Kojima
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
- Plant Science Center, RIKEN, Yokohama, Japan
| | - Haruka Minagawa
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Chika Yoshida
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Eri Inoue
- Plant Science Center, RIKEN, Yokohama, Japan
| | - Hideki Takahashi
- Plant Science Center, RIKEN, Yokohama, Japan
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, United States
| | - Keiki Ishiyama
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
- Plant Science Center, RIKEN, Yokohama, Japan
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Makino A, Suzuki Y, Ishiyama K. Enhancing photosynthesis and yield in rice with improved N use efficiency. Plant Sci 2022; 325:111475. [PMID: 36167261 DOI: 10.1016/j.plantsci.2022.111475] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 08/27/2022] [Accepted: 09/22/2022] [Indexed: 06/16/2023]
Abstract
The success of the dwarf breeding of rice, called the Green Revolution in Asia, resulted from increased source and sink capacities depending on significant inputs of N fertilizer. Although N fertilization is essential for increasing cereal production, large inputs of N application have significantly impacted the environment. Transgenic rice overproducing Rubisco has demonstrated increased yields with improved N use efficiency for increasing biomass production under high N fertilization in a paddy field. A large grain cultivar, Akita 63, had a high yield by enlarging the sink capacity without photosynthesis improvement. However, source capacity strongly limited the yield potential under high N fertilization. Enhancing photosynthesis is important for further increasing the yield of current high-yielding cultivars. Developing innovative rice plants with both high photosynthesis and large sink capacity is essential.
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Affiliation(s)
- Amane Makino
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai 980-8572, Japan.
| | - Yuji Suzuki
- Faculty of Agriculture, Iwate University, Morioka, Iwate 020-8550, Japan
| | - Keiki Ishiyama
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai 980-8572, Japan
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4
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Mikuni H, Watanabe G, Kumagai S, Yamamoto S, Sawada R, Yokoyama K, Honma Y, Sekine S, Kashihara T, Ishiyama K, Oguma J, Igaki H, Saruta M, Daiko H, Koyama S, Nishikawa H, Kato K. 1240P Activation status of CD8+ T and Treg cells in the tumor microenvironment potentially predicts the clinical efficacy of nivolumab in advanced esophageal squamous cell carcinoma. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.07.1358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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5
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Yoon D, Suganami M, Ishiyama K, Kagawa T, Tanaka M, Nagao R, Takagi D, Ishida H, Suzuki Y, Mae T, Makino A, Obara M. The gs3 allele from a large-grain rice cultivar, Akita 63, increases yield and improves nitrogen-use efficiency. Plant Direct 2022; 6:e417. [PMID: 35865075 PMCID: PMC9289216 DOI: 10.1002/pld3.417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 06/11/2022] [Accepted: 06/14/2022] [Indexed: 06/15/2023]
Abstract
The Green Revolution allowed a large amount of nitrogen (N) fertilization to increase crop yield but has led to severe environmental pollution. Therefore, increasing the crop grain yield must be achieved without such considerable input of N fertilization. A large-grain japonica rice cultivar, Akita 63, significantly increased grain yield and improved N-use efficiency (NUE) for yield per amount of N absorbed by plants. This study found that the nonsense mutated GS3 gene, the gs3 allele of Akita 63, has a superior yield production with enlarged grain size. The gs3 allele increased the yield with improvements in harvest index and NUE for yields per plant N content by analyzing the near-isogenic line of rice plants with a large grain (LG-Notohikari), which was developed by introducing the gs3 allele of Akita 63 into normal-grain japonica cultivar, Notohikari. Thus, the gs3 allele would be promising for further yield increase without additional large input of N fertilization in non-gs3-allele rice varieties.
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Affiliation(s)
- Dong‐Kyung Yoon
- Graduate School of Agricultural ScienceTohoku UniversitySendaiJapan
- Present address:
Gene Engineering DivisionNational Institute of Agricultural Sciences, Rural Development AdministrationJeonjuSouth Korea
| | - Mao Suganami
- Graduate School of Agricultural ScienceTohoku UniversitySendaiJapan
- Present address:
Faculty of Food and Agricultural Sciences, Institute of Fermentation SciencesFukushima UniversityFukushimaJapan
| | - Keiki Ishiyama
- Graduate School of Agricultural ScienceTohoku UniversitySendaiJapan
| | - Takaaki Kagawa
- Graduate School of Agricultural ScienceTohoku UniversitySendaiJapan
| | - Marin Tanaka
- Graduate School of Agricultural ScienceTohoku UniversitySendaiJapan
| | - Rina Nagao
- Graduate School of Agricultural ScienceTohoku UniversitySendaiJapan
| | - Daisuke Takagi
- Graduate School of Agricultural ScienceTohoku UniversitySendaiJapan
- Present address:
Faculty of AgricultureSetsunan UniversityHirakataOsakaJapan
| | - Hiroyuki Ishida
- Graduate School of Agricultural ScienceTohoku UniversitySendaiJapan
| | - Yuji Suzuki
- Faculty of AgricultureIwate UniversityMoriokaIwateJapan
| | - Tadahiko Mae
- Graduate School of Agricultural ScienceTohoku UniversitySendaiJapan
| | - Amane Makino
- Graduate School of Agricultural ScienceTohoku UniversitySendaiJapan
| | - Mitsuhiro Obara
- Japan International Research Center for Agricultural SciencesTsukubaIbarakiJapan
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6
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Obara M, Kaneta Y, Kodama I, Matsumoto S, Kawamoto T, Ishiyama K, Mae T, Makino A. Contribution of the grain size QTL GS3 to yield properties and physiological nitrogen-use efficiency in the large-grain rice cultivar 'Akita 63'. Breed Sci 2022; 72:124-131. [PMID: 36275939 PMCID: PMC9522531 DOI: 10.1270/jsbbs.21043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Accepted: 09/24/2021] [Indexed: 06/15/2023]
Abstract
The development of crop varieties with high nitrogen-use efficiency (NUE) is thought to be important in achieving sustainable cereal crop production. The high yield large-grain rice cultivar Oryza sativa L. 'Akita 63' (temperate japonica) has high physiological NUE (PNUE) for grain yield (GY). Our previous study revealed that a large-grain allele of GS3 is present in 'Akita 63'. Here, we verified the influence of GS3 on the yield properties and PNUE for GY in 'Akita 63'. The frequency distribution of brown rice length in F2 crosses of 'Iwate 75' and 'Akita 63' showed a continuous distribution that could be explained by GS3. A near-isogenic line was developed to substitute the GS3 segment of 'Koshihikari', which harbours a normal-sized grain allele, in the genetic background of 'Akita 63' and the line was designated as Akita63NILGS3-Koshihikari. Compared with Akita63NILGS3-Koshihikari, 'Akita 63' exhibited a significantly increased grain length, single brown grain weight and GY, although no significant differences were observed in the nitrogen content and above-ground biomass per unit of cultivated area. These results indicate that the GS3 large-grain allele is a contributing factor to high PNUE for GY in 'Akita 63'. These findings will facilitate the development of nitrogen-efficient rice varieties.
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Affiliation(s)
- Mitsuhiro Obara
- Biological Resources and Post-harvest Division, Japan International Research Center for Agricultural Sciences, 1-1 Ohwashi, Tsukuba, Ibaraki 305-8686, Japan
| | - Yoshihiro Kaneta
- Faculty of Bioresource Sciences, Akita Prefectural University, Shimosinjyou, Akita 010-0195, Japan
| | - Ikuko Kodama
- Akita Prefectural Agricultural Experiment Station, Aikawa Yuwamachi, Kawabe, Akita 010-1231, Japan
| | - Sinichi Matsumoto
- Akita Prefectural Agricultural Experiment Station, Aikawa Yuwamachi, Kawabe, Akita 010-1231, Japan
| | - Tomohiko Kawamoto
- Akita Prefectural Agricultural Experiment Station, Aikawa Yuwamachi, Kawabe, Akita 010-1231, Japan
| | - Keiki Ishiyama
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, Miyagi 980-8572, Japan
| | - Tadahiko Mae
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, Miyagi 980-8572, Japan
| | - Amane Makino
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, Miyagi 980-8572, Japan
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7
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Suzuki Y, Ishiyama K, Yoon DK, Takegahara-Tamakawa Y, Kondo E, Suganami M, Wada S, Miyake C, Makino A. Suppression of chloroplast triose phosphate isomerase evokes inorganic phosphate-limited photosynthesis in rice. Plant Physiol 2022; 188:1550-1562. [PMID: 34893891 PMCID: PMC8896644 DOI: 10.1093/plphys/kiab576] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 11/14/2021] [Indexed: 05/12/2023]
Abstract
The availability of inorganic phosphate (Pi) for ATP synthesis is thought to limit photosynthesis at elevated [CO2] when Pi regeneration via sucrose or starch synthesis is limited. We report here another mechanism for the occurrence of Pi-limited photosynthesis caused by insufficient capacity of chloroplast triose phosphate isomerase (cpTPI). In cpTPI-antisense transgenic rice (Oryza sativa) plants with 55%-86% reductions in cpTPI content, CO2 sensitivity of the rate of CO2 assimilation (A) decreased and even reversed at elevated [CO2]. The pool sizes of the Calvin-Benson cycle metabolites from pentose phosphates to 3-phosphoglycerate increased at elevated [CO2], whereas those of ATP decreased. These phenomena are similar to the typical symptoms of Pi-limited photosynthesis, suggesting sufficient capacity of cpTPI is necessary to prevent the occurrence of Pi-limited photosynthesis and that cpTPI content moderately affects photosynthetic capacity at elevated [CO2]. As there tended to be slight variations in the amounts of total leaf-N depending on the genotypes, relationships between A and the amounts of cpTPI were examined after these parameters were expressed per unit amount of total leaf-N (A/N and cpTPI/N, respectively). A/N at elevated [CO2] decreased linearly as cpTPI/N decreased before A/N sharply decreased, owing to further decreases in cpTPI/N. Within this linear range, decreases in cpTPI/N by 80% led to decreases up to 27% in A/N at elevated [CO2]. Thus, cpTPI function is crucial for photosynthesis at elevated [CO2].
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Affiliation(s)
- Yuji Suzuki
- Faculty of Agriculture, Iwate University, Morioka, Iwate 020-8550, Japan
- Author for communication:
| | - Keiki Ishiyama
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
| | - Dong-Kyung Yoon
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
| | | | - Eri Kondo
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
| | - Mao Suganami
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
| | - Shinya Wada
- Graduate School of Agricultural Science, Kobe University, Kobe 657-8501, Japan
| | - Chikahiro Miyake
- Graduate School of Agricultural Science, Kobe University, Kobe 657-8501, Japan
| | - Amane Makino
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
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8
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Tanaka M, Keira M, Yoon DK, Mae T, Ishida H, Makino A, Ishiyama K. Photosynthetic Enhancement, Lifespan Extension, and Leaf Area Enlargement in Flag Leaves Increased the Yield of Transgenic Rice Plants Overproducing Rubisco Under Sufficient N Fertilization. Rice (N Y) 2022; 15:10. [PMID: 35138458 PMCID: PMC8828814 DOI: 10.1186/s12284-022-00557-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Accepted: 01/31/2022] [Indexed: 06/07/2023]
Abstract
BACKGROUND Improvement in photosynthesis is one of the most promising approaches to increase grain yields. Transgenic rice plants overproducing Rubisco by 30% (RBCS-sense rice plants) showed up to 28% increase in grain yields under sufficient nitrogen (N) fertilization using an isolated experimental paddy field (Yoon et al. in Nat Food 1:134-139, 2020). The plant N contents above-ground sections and Rubisco contents of the flag leaves were higher in the RBCS-sense plants than in the wild-type rice plants during the ripening period, which may be reasons for the increased yields. However, some imprecise points were left in the previous research, such as contributions of photosynthesis of leaves below the flag leaves to the yield, and maintenance duration of high photosynthesis of RBCS-sense rice plants during ripening periods. RESULT In this research, the photosynthetic capacity and canopy architecture were analyzed to explore factors for the increased yields of RBCS-sense rice plants. It was found that N had already been preferentially distributed into the flag leaves at the early ripening stage, contributing to maintaining higher Rubisco content levels in the enlarged flag leaves and extending the lifespan of the flag leaves of RBCS-sense rice plants throughout ripening periods under sufficient N fertilization. The higher amounts of Rubisco also improved the photosynthetic activity in the flag leaves throughout the ripening period. Although the enlarged flag leaves of the RBCS-sense rice plants occupied large spatial areas of the uppermost layer in the canopy, no significant prevention of light penetration to leaves below the flag leaves was observed. Additionally, since the CO2 assimilation rates of lower leaves between wild-type and RBCS-sense rice plants were the same at the early ripening stage, the lower leaves did not contribute to an increase in yields of the RBCS-sense rice plants. CONCLUSION We concluded that improvements in the photosynthetic capacity by higher leaf N and Rubisco contents, enlarged leaf area and extended lifespan of flag leaves led to an increase in grain yields of RBCS-sense rice plants grown under sufficient N fertilization.
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Affiliation(s)
- Marin Tanaka
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572, Japan
| | - Mamoru Keira
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572, Japan
| | - Dong-Kyung Yoon
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572, Japan
| | - Tadahiko Mae
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572, Japan
| | - Hiroyuki Ishida
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572, Japan
| | - Amane Makino
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572, Japan
| | - Keiki Ishiyama
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572, Japan.
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9
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Fujita T, Beier MP, Tabuchi-Kobayashi M, Hayatsu Y, Nakamura H, Umetsu-Ohashi T, Sasaki K, Ishiyama K, Murozuka E, Kojima M, Sakakibara H, Sawa Y, Miyao A, Hayakawa T, Yamaya T, Kojima S. Cytosolic Glutamine Synthetase GS1;3 Is Involved in Rice Grain Ripening and Germination. Front Plant Sci 2022; 13:835835. [PMID: 35211144 PMCID: PMC8861362 DOI: 10.3389/fpls.2022.835835] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 01/17/2022] [Indexed: 06/14/2023]
Abstract
Ammonium is combined with glutamate to form glutamine. This reaction is catalyzed by glutamine synthetase (GS or GLN). Plants harbor several isoforms of cytosolic GS (GS1). Rice GS1;3 is highly expressed in seeds during grain filling and germination, suggesting a unique role in these processes. This study aimed to investigate the role of GS1;3 for rice growth and yield. Tos17 insertion lines for GS1;3 were isolated, and the nitrogen (N), amino acid, and ammonium contents of GS1;3 mutant grains were compared to wild-type grains. The spatiotemporal expression of GS1;3 and the growth and yield of rice plants were evaluated in hydroponic culture and the paddy field. Additionally, the stable isotope of N was used to trace the foliar N flux during grain filling. Results showed that the loss of GS1;3 retarded seed germination. Seeds of GS1;3 mutants accumulated glutamate but did not show a marked change in the level of phytohormones. The expression of GS1;3 was detected at the beginning of germination, with limited promoter activity in seeds. GS1;3 mutants showed a considerably decreased ripening ratio and decreased N efflux in the 12th leaf blade under N deficient conditions. The β-glucuronidase gene expression under control of the GS1;3 promoter was detected in the vascular tissue and aleurone cell layer of developing grains. These data suggest unique physiological roles of GS1;3 in the early stage of seed germination and grain filling under N deficient conditions in rice.
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Affiliation(s)
- Takayuki Fujita
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Marcel Pascal Beier
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
- Faculty of Science/Institute for the Advancement of Higher Education, Hokkaido University, Sapporo, Japan
| | | | - Yoshitaka Hayatsu
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Haruka Nakamura
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | | | - Kazuhiro Sasaki
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Keiki Ishiyama
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Emiko Murozuka
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Mikiko Kojima
- Center for Sustainable Resource Science, RIKEN, Yokohama, Japan
| | - Hitoshi Sakakibara
- Center for Sustainable Resource Science, RIKEN, Yokohama, Japan
- Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
| | - Yuki Sawa
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Akio Miyao
- Institute of Crop Science, National Agriculture and Food Research Organization, Tsukuba, Japan
| | - Toshihiko Hayakawa
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Tomoyuki Yamaya
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
- Division for Interdisciplinary Advanced Research and Education, Tohoku University, Sendai, Japan
| | - Soichi Kojima
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
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Takagi D, Ishiyama K, Suganami M, Ushijima T, Fujii T, Tazoe Y, Kawasaki M, Noguchi K, Makino A. Manganese toxicity disrupts indole acetic acid homeostasis and suppresses the CO 2 assimilation reaction in rice leaves. Sci Rep 2021; 11:20922. [PMID: 34686733 PMCID: PMC8536708 DOI: 10.1038/s41598-021-00370-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Accepted: 10/11/2021] [Indexed: 11/21/2022] Open
Abstract
Despite the essentiality of Mn in terrestrial plants, its excessive accumulation in plant tissues can cause growth defects, known as Mn toxicity. Mn toxicity can be classified into apoplastic and symplastic types depending on its onset. Symplastic Mn toxicity is hypothesised to be more critical for growth defects. However, details of the relationship between growth defects and symplastic Mn toxicity remain elusive. In this study, we aimed to elucidate the molecular mechanisms underlying symplastic Mn toxicity in rice plants. We found that under excess Mn conditions, CO2 assimilation was inhibited by stomatal closure, and both carbon anabolic and catabolic activities were decreased. In addition to stomatal dysfunction, stomatal and leaf anatomical development were also altered by excess Mn accumulation. Furthermore, indole acetic acid (IAA) concentration was decreased, and auxin-responsive gene expression analyses showed IAA-deficient symptoms in leaves due to excess Mn accumulation. These results suggest that excessive Mn accumulation causes IAA deficiency, and low IAA concentrations suppress plant growth by suppressing stomatal opening and leaf anatomical development for efficient CO2 assimilation in leaves.
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Affiliation(s)
- Daisuke Takagi
- grid.412493.90000 0001 0454 7765Faculty of Agriculture, Setsunan University, Hirakata, Osaka 573-0101 Japan ,grid.69566.3a0000 0001 2248 6943Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi 980-8572 Japan
| | - Keiki Ishiyama
- grid.69566.3a0000 0001 2248 6943Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi 980-8572 Japan
| | - Mao Suganami
- grid.69566.3a0000 0001 2248 6943Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi 980-8572 Japan ,grid.443549.b0000 0001 0603 1148Present Address: Faculty of Food and Agricultural Sciences, Fukushima University, Kanayagawa, Fukushima 960-1296 Japan
| | - Tomokazu Ushijima
- grid.412493.90000 0001 0454 7765Faculty of Agriculture, Setsunan University, Hirakata, Osaka 573-0101 Japan
| | - Takeshi Fujii
- grid.412493.90000 0001 0454 7765Faculty of Agriculture, Setsunan University, Hirakata, Osaka 573-0101 Japan
| | - Youshi Tazoe
- grid.69566.3a0000 0001 2248 6943Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi 980-8572 Japan ,grid.505732.60000 0004 6417 4827Present Address: Faculty of Agro-Food Science, Niigata Agro-Food University, Tainai, Niigata 959-2702 Japan
| | - Michio Kawasaki
- grid.412493.90000 0001 0454 7765Faculty of Agriculture, Setsunan University, Hirakata, Osaka 573-0101 Japan
| | - Ko Noguchi
- grid.410785.f0000 0001 0659 6325Department of Applied Life Science, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392 Japan
| | - Amane Makino
- grid.69566.3a0000 0001 2248 6943Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi 980-8572 Japan
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11
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Suzuki Y, Ishiyama K, Sugawara M, Suzuki Y, Kondo E, Takegahara-Tamakawa Y, Yoon DK, Suganami M, Wada S, Miyake C, Makino A. Overproduction of Chloroplast Glyceraldehyde-3-Phosphate Dehydrogenase Improves Photosynthesis Slightly under Elevated [CO2] Conditions in Rice. Plant Cell Physiol 2021; 62:156-165. [PMID: 33289530 DOI: 10.1093/pcp/pcaa149] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 11/16/2020] [Indexed: 06/12/2023]
Abstract
Chloroplast glyceraldehyde-3-phosphate dehydrogenase (GAPDH) limits the regeneration of ribulose 1,5-bisphosphate (RuBP) in the Calvin-Benson cycle. However, it does not always limit the rate of CO2 assimilation. In the present study, the effects of overproduction of GAPDH on the rate of CO2 assimilation under elevated [CO2] conditions, where the capacity for RuBP regeneration limits photosynthesis, were examined in transgenic rice (Oryza sativa). GAPDH activity was increased to 3.2- and 4.5-fold of the wild-type levels by co-overexpression of the GAPDH genes, GAPA and GAPB, respectively. In the transgenic rice plants, the rate of CO2 assimilation under elevated [CO2] conditions increased by approximately 10%, whereas that under normal and low [CO2] conditions was not affected. These results indicate that overproduction of GAPDH is effective in improving photosynthesis under elevated [CO2] conditions, although its magnitude is relatively small. By contrast, biomass production of the transgenic rice plants was not greater than that of wild-type plants under elevated [CO2] conditions, although starch content tended to increase marginally.
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Affiliation(s)
- Yuji Suzuki
- Faculty of Agriculture, Iwate University, 3-18-8 Ueda, Morioka, 020-8550 Japan
| | - Keiki Ishiyama
- Faculty of Agriculture, Iwate University, 3-18-8 Ueda, Morioka, 020-8550 Japan
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572 Japan
| | - Misaki Sugawara
- Faculty of Agriculture, Iwate University, 3-18-8 Ueda, Morioka, 020-8550 Japan
| | - Yuka Suzuki
- Faculty of Agriculture, Iwate University, 3-18-8 Ueda, Morioka, 020-8550 Japan
| | - Eri Kondo
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572 Japan
| | | | - Dong-Kyung Yoon
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572 Japan
| | - Mao Suganami
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572 Japan
| | - Shinya Wada
- Faculty of Agriculture, Iwate University, 3-18-8 Ueda, Morioka, 020-8550 Japan
- Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, 657-8501 Japan
| | - Chikahiro Miyake
- Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, 657-8501 Japan
| | - Amane Makino
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572 Japan
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12
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Makino A, Kaneta Y, Obara M, Ishiyama K, Kanno K, Kondo E, Suzuki Y, Mae T. High yielding ability of a large-grain rice cultivar, Akita 63. Sci Rep 2020; 10:12231. [PMID: 32699370 PMCID: PMC7376063 DOI: 10.1038/s41598-020-69289-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Accepted: 07/09/2020] [Indexed: 01/22/2023] Open
Abstract
To increase the yield potential while limiting the environmental impact of N management practices is an important issue in rice cultivation. The large-grain rice cultivar Akita 63 showed higher N-use efficiency for grain production. To elucidate this, we analyzed yield characteristics of Akita 63 in comparison with those of a maternal cultivar, Oochikara with a large grain, a paternal cultivar, Akita 39 with a normal grain, and a Japanese leading cultivar, Akitakomachi. The yields of Akita 63 were 20% higher than those of Oochikara and Akita 39, and 50% higher than those of Akitakomachi for the same N application. Akita 63 showed superior N uptake capacity. Whereas a trade-off between single grain weight and grain number was found for Oochikara, Akita 63 did not show such a relationship. The success in Akita 63 breeding was due to overcoming such a trade-off. Akita 63 had the large-grain alleles of GS3 and qSW5. Thus, an enlargement of grain size can have a great impact on an increase in yield with improved N-use efficiency. However, an enlargement of sink capacity led to source limitation. Thus, both sink and source improvements are essential for a further increase in the yield of today's high-yielding cultivars.
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Affiliation(s)
- Amane Makino
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572, Japan.
| | - Yoshihiro Kaneta
- Faculty of Bioresource Sciences, Akita Prefectural University, Shimosinjyou, Akita, 010-0195, Japan
| | - Mitsuhiro Obara
- Japan International Research Center for Agricultural Sciences, Tsukuba, Ibaraki, 305-8686, Japan
| | - Keiki Ishiyama
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572, Japan
| | - Keiichi Kanno
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572, Japan
| | - Eri Kondo
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572, Japan
| | - Yuji Suzuki
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572, Japan
- Faculty of Agriculture, Iwate University, Morioka, 020-8550, Japan
| | - Tadahiko Mae
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aoba, Aoba-ku, Sendai, 980-8572, Japan
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13
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Tazoe Y, Ishikawa N, Shikanai T, Ishiyama K, Takagi D, Makino A, Sato F, Endo T. Overproduction of PGR5 enhances the electron sink downstream of photosystem I in a C 4 plant, Flaveria bidentis. Plant J 2020; 103:814-823. [PMID: 32314445 DOI: 10.1111/tpj.14774] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Revised: 03/31/2020] [Accepted: 04/07/2020] [Indexed: 05/25/2023]
Abstract
C4 plants can fix CO2 efficiently using CO2 -concentrating mechanisms (CCMs), but they require additional ATP. To supply the additional ATP, C4 plants operate at higher rates of cyclic electron transport around photosystem I (PSI), in which electrons are transferred from ferredoxin to plastoquinone. Recently, it has been reported that the NAD(P)H dehydrogenase-like complex (NDH) accumulated in the thylakoid membrane in leaves of C4 plants, making it a candidate for the additional synthesis of ATP used in the CCM. In addition, C4 plants have higher levels of PROTON GRADIENT REGULATION 5 (PGR5) expression, but it has been unknown how PGR5 functions in C4 photosynthesis. In this study, PGR5 was overexpressed in a C4 dicot, Flaveria bidentis. In PGR5-overproducing (OP) lines, PGR5 levels were 2.3- to 3.0-fold greater compared with wild-type plants. PGR5-like PHOTOSYNTHETIC PHENOTYPE 1 (PGRL1), which cooperates with PGR5, increased with PGR5. A spectroscopic analysis indicated that in the PGR5-OP lines, the acceptor side limitation of PSI was reduced in response to a rapid increase in photon flux density. Although it did not affect CO2 assimilation, the overproduction of PGR5 contributed to an enhanced electron sink downstream of PSI.
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Affiliation(s)
- Youshi Tazoe
- Graduate School of Biostudies, Kyoto University, Sakyo, Kyoto, 606-8052, Japan
- Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi, 980-0845, Japan
- CREST, JST, Gobancho, Chiyoda-ku, Tokyo, 102-0076, Japan
- Faculty of Agro-Food Science, Niigata Agro-Food University, Tainai, Niigata, 959-2702, Japan
| | - Noriko Ishikawa
- Graduate School of Biostudies, Kyoto University, Sakyo, Kyoto, 606-8052, Japan
| | - Toshiharu Shikanai
- CREST, JST, Gobancho, Chiyoda-ku, Tokyo, 102-0076, Japan
- Graduate School of Science, Kyoto University, Sakyo, Kyoto, 606-8052, Japan
| | - Keiki Ishiyama
- Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi, 980-0845, Japan
| | - Daisuke Takagi
- Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi, 980-0845, Japan
- Faculty of Agriculture, Setsunan University, Hirakata, Osaka, 573-0101, Japan
| | - Amane Makino
- Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi, 980-0845, Japan
- CREST, JST, Gobancho, Chiyoda-ku, Tokyo, 102-0076, Japan
| | - Fumihiko Sato
- Graduate School of Biostudies, Kyoto University, Sakyo, Kyoto, 606-8052, Japan
| | - Tsuyoshi Endo
- Graduate School of Biostudies, Kyoto University, Sakyo, Kyoto, 606-8052, Japan
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14
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Yoon DK, Ishiyama K, Suganami M, Tazoe Y, Watanabe M, Imaruoka S, Ogura M, Ishida H, Suzuki Y, Obara M, Mae T, Makino A. Transgenic rice overproducing Rubisco exhibits increased yields with improved nitrogen-use efficiency in an experimental paddy field. ACTA ACUST UNITED AC 2020; 1:134-139. [PMID: 37127998 DOI: 10.1038/s43016-020-0033-x] [Citation(s) in RCA: 74] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 01/23/2020] [Indexed: 11/09/2022]
Abstract
The green revolution's breeding of semi-dwarf rice cultivars in the 1960s improved crop yields, with large increases in the use of nitrogen (N) fertilizer. However, excess N application has caused serious environmental problems, including acid rain and the eutrophication of rivers and oceans. To use N to improve crop yields, while minimizing the associated environmental costs, there is a need to produce crops with higher N-use efficiency and higher yield components. Here we show that transgenic rice overproducing ribulose 1,5-bisphosphate carboxylase-oxygenase (Rubisco)-the key enzyme of photosynthesis-exhibits increased yields with improved N-use efficiency for increasing biomass production when receiving sufficient N fertilization in an experimental paddy field. This field experiment demonstrates an improvement in photosynthesis linked to yield increase due to a higher N-use efficiency in a major crop.
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Beier MP, Fujita T, Sasaki K, Kanno K, Ohashi M, Tamura W, Konishi N, Saito M, Imagawa F, Ishiyama K, Miyao A, Yamaya T, Kojima S. The urea transporter DUR3 contributes to rice production under nitrogen-deficient and field conditions. Physiol Plant 2019; 167:75-89. [PMID: 30426495 DOI: 10.1111/ppl.12872] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 10/29/2018] [Accepted: 11/06/2018] [Indexed: 06/09/2023]
Abstract
Nitrogen is one of the most important elements for plant growth, and urea is one of the most frequently used nitrogen fertilizers worldwide. Besides the exogenously-supplied urea to the soil, urea is endogenously synthesized during secondary nitrogen metabolism. Here, we investigated the contribution of a urea transporter, DUR3, to rice production using a reverse genetic approach combined with localization studies. Tos17 insertion lines for DUR3 showed a 50% yield reduction in hydroponic culture, and a 26.2% yield reduction in a paddy field, because of decreased grain filling. Because shoot biomass production and shoot total N was not reduced, insertion lines were disordered not only in nitrogen acquisition but also in nitrogen allocation. During seed development, DUR3 insertion lines accumulated nitrogen in leaves and could not sufficiently develop their panicles, although shoot and root dry weights were not significantly different from the wild-type. The urea concentration in old leaf harvested from DUR3 insertion lines was lower than that in wild-type. DUR3 promoter-dependent β-glucuronidase (GUS) activity was localized in vascular tissue and the midribs of old leaves. These results indicate that DUR3 contributes to nitrogen translocation and rice yield under nitrogen-deficient and field conditions.
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Affiliation(s)
- Marcel P Beier
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
- Graduate School of Life and Environmental Science, Osaka Prefecture University, Sakai 599-8531, Japan
| | - Takayuki Fujita
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
| | - Kazuhiro Sasaki
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 188-0002, Japan
| | - Keiichi Kanno
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
| | - Miwa Ohashi
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
| | - Wataru Tamura
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
| | - Noriyuki Konishi
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
| | - Masahide Saito
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
| | - Fumi Imagawa
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
| | - Keiki Ishiyama
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
| | - Akio Miyao
- National Institute of Agrobiological Science, Tsukuba, Ibaraki 3058602, Japan
| | - Tomoyuki Yamaya
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
| | - Soichi Kojima
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
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16
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Ohashi M, Ishiyama K, Kusano M, Fukushima A, Kojima S, Hayakawa T, Yamaya T. Reduction in sucrose contents by downregulation of fructose-1,6-bisphosphatase 2 causes tiller outgrowth cessation in rice mutants lacking glutamine synthetase1;2. Rice (N Y) 2018; 11:65. [PMID: 30578468 PMCID: PMC6303225 DOI: 10.1186/s12284-018-0261-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Accepted: 12/13/2018] [Indexed: 05/05/2023]
Abstract
BACKGROUND Our previous transcriptomic analysis revealed that downregulation of nitrogen and carbon metabolism in the basal portions of the shoots inhibited cytosolic glutamine synthetase1;2 (GS1;2), which severely reduced rice tiller number. In the present study, we used rice mutants lacking GS1;2 (gs1;2 mutants) to determine the contribution of carbon metabolism to tiller growth. RESULTS Metabolomic analysis indicated the effects of carbon metabolism disorder such as reductions in the levels of sugar metabolites (e.g., sucrose and glucose 6-phosphate) in the shoot basal portions of the gs1;2 mutant seedlings. Decrease in sucrose caused by the lack of GS1;2 was successfully restored to the wild-type levels by introducing OsGS1;2 cDNA into the mutants. In the basal portions of the shoots, the lack of GS1;2 caused low expression of cytosolic fructose 1,6-bisphosphatase2 (OscFBP2), which is a key cytosolic sucrose synthesis enzyme; it is especially important in the phloem companion cells of the nodal vascular anastomoses. NH4+ supply upregulated OscFBP2 expression in the shoot basal portions of the wild type but not in those of the gs1;2 mutants. Rice mutants lacking cFBPase2 presented with ~ 30% reduction in total cFBPase activity in the basal portions of their shoots. These mutants displayed reductions in sucrose levels of the basal portions of their shoots but not in their leaf blades. They also had relatively lower tiller numbers at the early growth stage. CONCLUSIONS Metabolomic analysis revealed that the lack of GS1;2 reduced sucrose metabolism in the basal portions of the shoots. Our results indicated that sucrose reduction was caused by the downregulation of OscFBP2 expression in the basal portions of the gs1;2 mutant shoots. The reduction in sucrose content caused by the lack of cFBPase2 resulted in lower tiller number at the early growth stage. Therefore, adequate sucrose supply via cFBPase2 may be necessary for tiller growth in the basal portions of rice shoots.
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Affiliation(s)
- Miwa Ohashi
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki-Aza, Aoba-ku, Sendai, 980-8572, Japan.
- Present address: Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan.
| | - Keiki Ishiyama
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki-Aza, Aoba-ku, Sendai, 980-8572, Japan
- Present address: Faculty of Agriculture, Iwate University, 3-18-8, Ueda, Morioka, 020-8550, Japan
| | - Miyako Kusano
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8577, Japan
- RIKEN Center for Sustainable Resource Science, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, 230-0045, Japan
| | - Atsushi Fukushima
- RIKEN Center for Sustainable Resource Science, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, 230-0045, Japan
| | - Soichi Kojima
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki-Aza, Aoba-ku, Sendai, 980-8572, Japan
| | - Toshihiko Hayakawa
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki-Aza, Aoba-ku, Sendai, 980-8572, Japan
| | - Tomoyuki Yamaya
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki-Aza, Aoba-ku, Sendai, 980-8572, Japan
- Present address: Division for Interdisciplinary Advanced Research and Education, Tohoku University, 6-3 Aoba, Aramaki-Aza, Aoba-ku, Sendai, 980-8572, Japan
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17
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Nakamura Y, Ihara M, Ishiyama K, Okamoto Y, Kinoshita M, Sohara H. P1914The efficacy of real-time pulmonary vein potential recording using a ring catheter during HotBalloon pulmonary vein isolation; the strategy to prevent pulmonary vein stenosis. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Y Nakamura
- Tokyo Heart Center, The Heart Rhythm Center, Tokyo, Japan
| | - M Ihara
- Tokyo Heart Center, The Heart Rhythm Center, Tokyo, Japan
| | - K Ishiyama
- Tokyo Heart Center, The Heart Rhythm Center, Tokyo, Japan
| | - Y Okamoto
- Tokyo Heart Center, The Heart Rhythm Center, Tokyo, Japan
| | - M Kinoshita
- Tokyo Heart Center, The Heart Rhythm Center, Tokyo, Japan
| | - H Sohara
- Tokyo Heart Center, The Heart Rhythm Center, Tokyo, Japan
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18
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Ohashi M, Ishiyama K, Kojima S, Konishi N, Sasaki K, Miyao M, Hayakawa T, Yamaya T. Outgrowth of Rice Tillers Requires Availability of Glutamine in the Basal Portions of Shoots. Rice (N Y) 2018; 11:31. [PMID: 29744685 PMCID: PMC5943206 DOI: 10.1186/s12284-018-0225-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Accepted: 04/30/2018] [Indexed: 05/06/2023]
Abstract
BACKGROUND Our previous studies concluded that metabolic disorder in the basal portions of rice shoots caused by a lack of cytosolic glutamine synthetase1;2 (GS1;2) resulted in a severe reduction in the outgrowth of tillers. Rice mutants lacking GS1;2 (gs1;2 mutants) showed a remarkable reduction in the contents of both glutamine and asparagine in the basal portions of shoots. In the current study, we attempted to reveal the mechanisms for this decrease in asparagine content using rice mutants lacking either GS1;2 or asparagine synthetase 1 (AS1). The contributions of the availability of glutamine and asparagine to the outgrowth of rice tillers were investigated. RESULTS Rice has two AS genes, and the enzymes catalyse asparagine synthesis from glutamine. In the basal portions of rice shoots, expression of OsAS1, the major species in this tissue, was reduced in gs1;2 mutants, whereas OsAS2 expression was relatively constant. OsAS1 was expressed in phloem companion cells of the nodal vascular anastomoses connected to the axillary bud vasculatures in the basal portions of wild-type shoots, whereas cell-specific expression was markedly reduced in gs1;2 mutants. OsAS1 was up-regulated significantly by NH4+ supply in the wild type but not in gs1;2 mutants. When GS reactions were inhibited by methionine sulfoximine, OsAS1 was up-regulated by glutamine but not by NH4+. The rice mutants lacking AS1 (as1 mutants) showed a decrease in asparagine content in the basal portions of shoots. However, glutamine content and tiller number were less affected by the lack of AS1. CONCLUSION These results indicate that in phloem companion cells of the nodal vascular anastomoses, asparagine synthesis is largely dependent on glutamine or its related metabolite-responsive AS1. Thus, the decrease in glutamine content caused by a lack of GS1;2 is suggested to result in low expression of OsAS1, decreasing asparagine content. However, the availability of asparagine generated from AS1 reactions is apparently less effective for the outgrowth of tillers. With respect to the tiller number and the contents of glutamine and asparagine in gs1;2 and as1 mutants, the availability of glutamine rather than asparagine in basal portions of rice shoots may be required for the outgrowth of rice tillers.
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Affiliation(s)
- Miwa Ohashi
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki-Aza, Aoba-ku, Sendai, 980-8572, Japan.
- Present Address: Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan.
| | - Keiki Ishiyama
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki-Aza, Aoba-ku, Sendai, 980-8572, Japan
| | - Soichi Kojima
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki-Aza, Aoba-ku, Sendai, 980-8572, Japan
| | - Noriyuki Konishi
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki-Aza, Aoba-ku, Sendai, 980-8572, Japan
- Present Address: Institute of Plant Science and Resources, Okayama University, 2-20-1 Chuo, Kurashiki, 710-0046, Japan
| | - Kazuhiro Sasaki
- The University of Tokyo, Graduate School of Agricultural and Life Sciences, Institute of Sustainable Agro-ecosystem Services (ISAS), 1-1-1 Midori-cho, Nishitokyo, Tokyo, 188-0002, Japan
| | - Mitsue Miyao
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki-Aza, Aoba-ku, Sendai, 980-8572, Japan
| | - Toshihiko Hayakawa
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki-Aza, Aoba-ku, Sendai, 980-8572, Japan
| | - Tomoyuki Yamaya
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki-Aza, Aoba-ku, Sendai, 980-8572, Japan
- Present Address: Division for Interdisciplinary Advanced Research and Education, Tohoku University, 6-3 Aoba, Aramaki-Aza, Aoba-ku, Sendai, 980-0845, Japan
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19
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Nakano R, Ohira M, Ishiyama K, Ide K, Kobayashi T, Tahara H, Shimizu S, Arihiro K, Imamura M, Chayama K, Tanaka Y, Ohdan H. Acute Graft Rejection and Formation of De Novo Donor-Specific Antibodies Triggered by Low Cyclosporine Levels and Interferon Therapy for Recurrent Hepatitis C Infection After Liver Transplantation: A Case Report. Transplant Proc 2018; 49:1634-1638. [PMID: 28838454 DOI: 10.1016/j.transproceed.2017.05.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 05/13/2017] [Indexed: 12/20/2022]
Abstract
BACKGROUND We report a case of acute rejection of a liver graft, together with the occurrence of de novo donor-specific antibodies (DSAs), in a 53-year-old Japanese man who had undergone deceased-donor liver transplantation. METHODS The graft rejection was triggered by low cyclosporine levels and pegylated interferon treatment for the recurrence of hepatitis C virus (HCV) infection 18 months after transplantation. Although the graft was ABO-compatible, pre-formed DSA B51 was detected; therefore, total plasma exchange was performed and intravenous rituximab (500 mg/body) was administered before transplantation. RESULTS DSA was absent 6 months after transplantation. HCV recurrence was treated with pegylated interferon-α-2a. Renal function deteriorated with this anti-HCV therapy, with serum cyclosporine levels decreasing to 50 ng/mL. A rapid virologic response was achieved, but liver function deteriorated after 3 months of anti-HCV therapy, with histologic evidence of acute cellular rejection and formation of de novo DSAs. Anti-thymocyte globulin was administered for 5 days, which led to immediate improvement in liver function. However, renal function declined, warranting hemodialysis. The patient recovered 2 months after acute rejection, although de novo DSAs persisted. CONCLUSIONS Careful immunologic monitoring may be required for patients receiving interferon therapy for HCV infection to maintain sufficient blood levels of immunosuppressive agents and to prevent acute liver graft rejection.
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Affiliation(s)
- R Nakano
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - M Ohira
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.
| | - K Ishiyama
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - K Ide
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - T Kobayashi
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - H Tahara
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - S Shimizu
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - K Arihiro
- Department of Pathology, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan
| | - M Imamura
- Department of Gastroenterology and Metabolism, Applied Life Science, Institute of Biomedical and Health Science, Hiroshima University, Hiroshima, Japan
| | - K Chayama
- Department of Gastroenterology and Metabolism, Applied Life Science, Institute of Biomedical and Health Science, Hiroshima University, Hiroshima, Japan
| | - Y Tanaka
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - H Ohdan
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
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20
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Nakamura Y, Sohara H, Ihara M, Ishiyama K. P1144Mid-term outcome after HotBalloon pulmonary vein isolation: a single center prospective study in patients with paroxysmal atrial fibrillation. Europace 2018. [DOI: 10.1093/europace/euy015.630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Y Nakamura
- Tokyo Heart Center, The Heart Rhythm Center, Tokyo, Japan
| | - H Sohara
- Tokyo Heart Center, The Heart Rhythm Center, Tokyo, Japan
| | - M Ihara
- Tokyo Heart Center, The Heart Rhythm Center, Tokyo, Japan
| | - K Ishiyama
- Tokyo Heart Center, The Heart Rhythm Center, Tokyo, Japan
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21
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Yabuki Y, Ohashi M, Imagawa F, Ishiyama K, Beier MP, Konishi N, Umetsu-Ohashi T, Hayakawa T, Yamaya T, Kojima S. A temporal and spatial contribution of asparaginase to asparagine catabolism during development of rice grains. Rice (N Y) 2017; 10:3. [PMID: 28124210 PMCID: PMC5267587 DOI: 10.1186/s12284-017-0143-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Accepted: 01/19/2017] [Indexed: 05/08/2023]
Abstract
BACKGROUND Asparagine is one of the most dominant organic nitrogen compounds in phloem and xylem sap in a wide range of plant species. Asparaginase (ASNase; EC, 3.5.1.1) catabolizes asparagine into aspartate and ammonium; therefore, it is suggested to play a key role in asparagine metabolism within legume sink organs. However, the metabolic fate of asparagine in source and sink organs during rice seed production remains to be elucidated. Therefore, the main objective of this study is to investigate the asparagine metabolism in a temporal and spatial manner during rice seed production. RESULTS For this purpose, the expression of genes involved in asparagine catabolism, such as asparaginase1 (OsASNase1) and 2 (OsASNase2), were quantitatively measured, and contents of asparagine, aspartate and ammonium ions were determined in sink and source organs during spikelet ripening. Quantitative real-time PCR and in situ localization studies determined that OsASNase2 is expressed in the dorsal vascular bundles and nucellar projection of developing grains, as well as in mesophyll and phloem companion cells of senescent flag leaves. Amino acid measurements revealed that the aspartate concentration is higher than asparagine in both source and sink organs. CONCLUSION This work suggests that asparaginase dependent asparagine catabolism occurred not only in sink but also in source organs.
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Affiliation(s)
- Yui Yabuki
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki, Sendai, 9800845 Japan
| | - Miwa Ohashi
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki, Sendai, 9800845 Japan
| | - Fumi Imagawa
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki, Sendai, 9800845 Japan
| | - Keiki Ishiyama
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki, Sendai, 9800845 Japan
| | - Marcel Pascal Beier
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki, Sendai, 9800845 Japan
| | - Noriyuki Konishi
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki, Sendai, 9800845 Japan
| | - Toshiko Umetsu-Ohashi
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki, Sendai, 9800845 Japan
| | - Toshihiko Hayakawa
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki, Sendai, 9800845 Japan
| | - Tomoyuki Yamaya
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki, Sendai, 9800845 Japan
| | - Soichi Kojima
- Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki, Sendai, 9800845 Japan
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22
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Kanazawa T, Seki M, Ishiyama K, Araseki M, Izaike Y, Takahashi T. Administration of gonadotropin-releasing hormone agonist on Day 5 increases luteal blood flow and improves pregnancy prediction accuracy on Day 14 in recipient Holstein cows. J Reprod Dev 2017; 63:389-399. [PMID: 28552886 PMCID: PMC5592161 DOI: 10.1262/jrd.2016-128] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
This study assessed the effects of gonadotropin-releasing hormone (GnRH) treatment on Day 5 (Day 0 = estrus) on luteal blood flow and accuracy of pregnancy prediction in recipient cows. On Day 5, 120 lactating Holstein cows were randomly assigned to a control group (n = 63) or GnRH group treated with 100 μg of GnRH agonist (n = 57). On Days 3, 5, 7, and 14, each cow underwent ultrasound examination to measure the blood flow area (BFA) and time-averaged maximum velocity (TAMV) at the spiral arteries at the base of the corpus luteum using color Doppler ultrasonography. Cows with a corpus luteum diameter ≥ 20 mm (n = 120) received embryo transfers on Day 7. The BFA values in the GnRH group were significantly higher than those in the control group on Days 7 and 14. TAMV did not differ between these groups. According to receiver operating characteristic analyses to predict pregnancy, a BFA cutoff of 0.52 cm2 yielded the highest sensitivity (83.3%) and specificity (90.5%) on Day 7, and BFA and TAMV values of 0.94 cm2 and 44.93 cm/s, respectively, yielded the highest sensitivity (97.1%) and specificity (100%) on Day 14 in the GnRH group. The areas under the curve for the paired BFA and TAMV in the GnRH group were 0.058 higher than those in the control group (0.996 and 0.938, respectively; P < 0.05). In conclusion, GnRH treatment on Day 5 increased the luteal BFA in recipient cows on Days 7 and 14, and improved the accuracy of pregnancy prediction on Day 14.
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Affiliation(s)
- Tomomi Kanazawa
- United Graduate School of Veterinary Science, Gifu University, Gifu 501-1193, Japan.,Miyagi Prefectural Federated Agricultural Mutual Aid Association, Miyagi 980-0011, Japan
| | - Motohide Seki
- Faculty of Science, Kyushu University, Fukuoka 819-0395, Japan
| | - Keiki Ishiyama
- Graduate School of Agricultural Science, Tohoku University, Miyagi 980-0845 Japan
| | | | - Yoshiaki Izaike
- United Graduate School of Veterinary Science, Gifu University, Gifu 501-1193, Japan.,Cooperative department of Veterinary Medicine, Faculty of Agriculture, Iwate University, Iwate 020-8550, Japan
| | - Toru Takahashi
- United Graduate School of Veterinary Science, Gifu University, Gifu 501-1193, Japan.,Cooperative department of Veterinary Medicine, Faculty of Agriculture, Iwate University, Iwate 020-8550, Japan
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23
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Itonaga H, Ishiyama K, Aoki J, Aoki K, Ishikawa T, Uchida N, Ohashi K, Ueda Y, Fukuda T, Ichinohe T, Takanashi M, Atsuta Y, Miyazaki Y. Allogeneic Hematopoietic Stem Cell Transplantation for Patients Aged 60 Years or Older with Myelodysplastic Syndrome in Japan. Leuk Res 2017. [DOI: 10.1016/s0145-2126(17)30153-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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24
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Ohashi M, Ishiyama K, Kojima S, Kojima M, Sakakibara H, Yamaya T, Hayakawa T. Lack of Cytosolic Glutamine Synthetase1;2 Activity Reduces Nitrogen-Dependent Biosynthesis of Cytokinin Required for Axillary Bud Outgrowth in Rice Seedlings. Plant Cell Physiol 2017; 58:679-690. [PMID: 28186255 DOI: 10.1093/pcp/pcx022] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Accepted: 02/01/2017] [Indexed: 05/05/2023]
Abstract
A mutation abolishing cytosolic glutamine synthetase1;2 (GS1;2) activity impairs assimilation of ammonium into glutamine in both roots and basal portions of shoots, and severely decreases axillary bud outgrowth (tillering) in mutant rice seedlings. Although the gs1;2 mutant phenotype is independent of strigolactone, which inhibits tillering, it also demonstrates glutamine- or related metabolite-responsive biosynthesis of cytokinin (CK), which promotes tillering. Here, we examined the connection between GS1;2 and CK biosynthesis during tillering, focusing on basal portions of the shoots as well as apical and axillary bud meristems in the gs1;2 mutant. Despite a sufficient ammonium supply, decreases in precursor CK contents and a decrease in ammonium assimilation into glutamine were observed in basal portions of mutant shoots. Reintroducing expression of OsGS1;2 cDNA driven by its own promoter restored precursor CK contents and ammonium assimilation to wild-type levels. In basal portions of the shoots, glutamine-responsive adenosine phosphate-isopentenyltransferase4 (OsIPT4), which is also predominant in rice roots, was the predominant isogene for IPT, which synthesizes CK. Cell-specific expression of OsIPT4 in phloem companion cells in nodal vascular anastomoses connected to the axillary bud vasculature also decreased in the gs1;2 mutant. Expression of CK-responsive type-A response regulator genes as local indicators of active CKs was also abolished in the axillary bud meristem of the mutant. These results suggest that the lack of GS1;2 activity decreased levels of glutamine or a related metabolite required for CK biosynthesis, causing a deficiency in active CK in the axillary bud meristem necessary for tillering.
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Affiliation(s)
- Miwa Ohashi
- Graduate School of Agricultural Science, Tohoku University, Aoba, Sendai, Japan
| | - Keiki Ishiyama
- Graduate School of Agricultural Science, Tohoku University, Aoba, Sendai, Japan
| | - Soichi Kojima
- Graduate School of Agricultural Science, Tohoku University, Aoba, Sendai, Japan
| | - Mikiko Kojima
- RIKEN Center for Sustainable Resource Science, Tsurumi, Yokohama, Japan
| | - Hitoshi Sakakibara
- RIKEN Center for Sustainable Resource Science, Tsurumi, Yokohama, Japan
- Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya, Japan
| | - Tomoyuki Yamaya
- Graduate School of Agricultural Science, Tohoku University, Aoba, Sendai, Japan
- University Research Administration Center, Tohoku University, Aoba, Sendai, Japan
- Division for Interdisciplinary Advanced Research and Education, Tohoku University, Aoba, Sendai, Japan
| | - Toshihiko Hayakawa
- Graduate School of Agricultural Science, Tohoku University, Aoba, Sendai, Japan
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25
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Tanimine N, Tanaka Y, Abe T, Piao J, Ishiyama K, Kobayashi T, Ide K, Ohira M, Tahara H, Shimizu S, Saeki Y, Sakai H, Yano T, Ohdan H. MELD and Child-Pugh Scores Are Related to Immune Status of Intrahepatic Natural Killer Cells in Liver Transplant Candidates. Transplant Proc 2017; 49:98-101. [PMID: 28104168 DOI: 10.1016/j.transproceed.2016.11.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND The role and phenotypic alterations of intrahepatic natural killer (NK) cells in liver disease were investigated. Although intrahepatic NK cells reportedly functionally deteriorate in the fibrotic liver, it remains unclear how the clinical severity of liver disease affects intrahepatic NK cells in patients with advanced liver failure. METHODS We analyzed the phenotypic properties of intrahepatic NK cells by using mononuclear cells extracted from ex vivo liver perfusate effluents from patients who underwent liver transplantation. The relationship between the clinical severity of liver disease and the phenotype of intrahepatic NK cells in these patients was also evaluated. To estimate the immunological responsiveness of intrahepatic NK cells, phenotypic enhancement after interleukin-2 stimulation was analyzed. RESULTS Intrahepatic NK cells from patients with advanced liver failure exhibited down-regulated monomodal expression of NKp46, a major activating molecule. Notably, the expression level of NKp46 decreased depending on the severity of liver disease, Model for End-Stage Liver Disease score, and Child-Pugh score rather than the etiology. After in vitro recombinant interleukin-2 stimulation, the enhancement of expression of cytotoxic molecules, NKp44, and tumor necrosis factor-related apoptosis-inducing ligand was significantly impaired in intrahepatic NK cells from patients with liver failure, concurrently with decreased expression of CD122 and interleukin-2 receptor beta. CONCLUSIONS Our results suggest that terminal deterioration of liver environments by chronic liver disease impairs the potential of local NK cells, depending on the severity of the deterioration. These influences of advanced liver failure on intrahepatic NK cells may be attributed to multicentric carcinogenesis in patients with liver failure.
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Affiliation(s)
- N Tanimine
- Gastroenterological and Transplant Surgery, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Y Tanaka
- Gastroenterological and Transplant Surgery, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - T Abe
- Department of Surgery, Onomichi General Hospital, Hiroshima, Japan
| | - J Piao
- Gastroenterological and Transplant Surgery, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - K Ishiyama
- Gastroenterological and Transplant Surgery, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - T Kobayashi
- Gastroenterological and Transplant Surgery, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - K Ide
- Gastroenterological and Transplant Surgery, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - M Ohira
- Gastroenterological and Transplant Surgery, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - H Tahara
- Gastroenterological and Transplant Surgery, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - S Shimizu
- Gastroenterological and Transplant Surgery, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Y Saeki
- Gastroenterological and Transplant Surgery, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - H Sakai
- Gastroenterological and Transplant Surgery, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - T Yano
- Gastroenterological and Transplant Surgery, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - H Ohdan
- Gastroenterological and Transplant Surgery, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan.
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26
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Konishi N, Ishiyama K, Beier MP, Inoue E, Kanno K, Yamaya T, Takahashi H, Kojima S. Contributions of two cytosolic glutamine synthetase isozymes to ammonium assimilation in Arabidopsis roots. J Exp Bot 2017; 68:613-625. [PMID: 28007952 PMCID: PMC5441914 DOI: 10.1093/jxb/erw454] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Glutamine synthetase (GS) catalyzes a reaction that incorporates ammonium into glutamate and yields glutamine in the cytosol and chloroplasts. Although the enzymatic characteristics of the GS1 isozymes are well known, their physiological functions in ammonium assimilation and regulation in roots remain unclear. In this study we show evidence that two cytosolic GS1 isozymes (GLN1;2 and GLN1;3) contribute to ammonium assimilation in Arabidopsis roots. Arabidopsis T-DNA insertion lines for GLN1;2 and GLN1;3 (i.e. gln1;2 and gln1;3 single-mutants), the gln1;2:gln1;3 double-mutant, and the wild-type accession (Col-0) were grown in hydroponic culture with variable concentrations of ammonium to compare their growth, and their content of nitrogen, carbon, ammonium, and amino acids. GLN1;2 and GLN1;3 promoter-dependent green fluorescent protein was observed under conditions with or without ammonium supply. Loss of GLN1;2 caused significant suppression of plant growth and glutamine biosynthesis under ammonium-replete conditions. In contrast, loss of GLN1;3 caused slight defects in growth and Gln biosynthesis that were only visible based on a comparison of the gln1;2 single- and gln1;2:gln1;3 double-mutants. GLN1;2, being the most abundantly expressed GS1 isozyme, markedly increased following ammonium supply and its promoter activity was localized at the cortex and epidermis, while GLN1;3 showed only low expression at the pericycle, suggesting their different physiological contributions to ammonium assimilation in roots. The GLN1;2 promoter-deletion analysis identified regulatory sequences required for controlling ammonium-responsive gene expression of GLN1;2 in Arabidopsis roots. These results shed light on GLN1 isozyme-specific regulatory mechanisms in Arabidopsis that allow adaptation to an ammonium-replete environment.
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Affiliation(s)
- Noriyuki Konishi
- Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Sendai, Japan
| | - Keiki Ishiyama
- Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Sendai, Japan
- RIKEN Plant Science Center, Yokohama, Japan
| | - Marcel Pascal Beier
- Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Sendai, Japan
| | - Eri Inoue
- RIKEN Plant Science Center, Yokohama, Japan
| | - Keiichi Kanno
- Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Sendai, Japan
| | - Tomoyuki Yamaya
- Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Sendai, Japan
- RIKEN Plant Science Center, Yokohama, Japan
| | - Hideki Takahashi
- RIKEN Plant Science Center, Yokohama, Japan
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, USA
| | - Soichi Kojima
- Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Sendai, Japan
- RIKEN Plant Science Center, Yokohama, Japan
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27
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Saeki Y, Ishiyama K, Ishida N, Tanaka Y, Ohdan H. Role of Natural Killer Cells in the Innate Immune System After Intraportal Islet Transplantation in Mice. Transplant Proc 2017; 49:139-144. [DOI: 10.1016/j.transproceed.2016.10.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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28
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Mori T, Nagata Y, Makishima H, Sanada M, Shiozawa Y, Kon A, Yoshizato T, Sato-Otsubo A, Kataoka K, Shiraishi Y, Chiba K, Tanaka H, Ishiyama K, Miyawaki S, Mori H, Nakamaki T, Kihara R, Kiyoi H, Koeffler HP, Shih LY, Miyano S, Naoe T, Haferlach C, Kern W, Haferlach T, Ogawa S, Yoshida K. Somatic PHF6 mutations in 1760 cases with various myeloid neoplasms. Leukemia 2016; 30:2270-2273. [PMID: 27479181 DOI: 10.1038/leu.2016.212] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- T Mori
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Y Nagata
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - H Makishima
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - M Sanada
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Y Shiozawa
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - A Kon
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - T Yoshizato
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - A Sato-Otsubo
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - K Kataoka
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Y Shiraishi
- Laboratory of DNA Information Analysis, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - K Chiba
- Laboratory of DNA Information Analysis, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - H Tanaka
- Laboratory of Sequence Data Analysis, Human Genome Center, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - K Ishiyama
- Division of Hematology, Tokyo Metropolitan Ohtsuka Hospital, Tokyo, Japan
| | - S Miyawaki
- Division of Hematology, Tokyo Metropolitan Ohtsuka Hospital, Tokyo, Japan
| | - H Mori
- Division of Hematology, Internal Medicine, Showa University Fujigaoka Hospital, Kanagawa, Japan
| | - T Nakamaki
- Division of Hematology, Department of Medicine, Showa University, Kanagawa, Japan
| | - R Kihara
- Department of Hematology and Oncology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - H Kiyoi
- Department of Hematology and Oncology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - H P Koeffler
- Hematology/Oncology, Cedars-Sinai Medical Center, Los Angeles, CA, USA.,National University of Singapore, Cancer Science Institute of Singapore, Singapore, Singapore
| | - L-Y Shih
- Division of Hematology-Oncology, Department of Internal Medicine, Chang Gung Memorial Hospital, Chang Gung University, Taipei, Taiwan
| | - S Miyano
- Laboratory of DNA Information Analysis, Institute of Medical Science, The University of Tokyo, Tokyo, Japan.,Laboratory of Sequence Data Analysis, Human Genome Center, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - T Naoe
- Department of Hematology and Oncology, Nagoya University Graduate School of Medicine, Nagoya, Japan.,National Hospital Organization Nagoya Medical Center, Nagoya, Japan
| | - C Haferlach
- MLL Munich Leukemia Laboratory, Munich, Germany
| | - W Kern
- MLL Munich Leukemia Laboratory, Munich, Germany
| | - T Haferlach
- MLL Munich Leukemia Laboratory, Munich, Germany
| | - S Ogawa
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - K Yoshida
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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29
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Ishiyama K, Kitawaki T, Sugimoto N, Sozu T, Anzai N, Okada M, Nohgawa M, Hatanaka K, Arima N, Ishikawa T, Tabata S, Onaka T, Oka S, Nakabo Y, Amakawa R, Matsui M, Moriguchi T, Takaori-Kondo A, Kadowaki N. Principal component analysis uncovers cytomegalovirus-associated NK cell activation in Ph + leukemia patients treated with dasatinib. Leukemia 2016; 31:203-212. [PMID: 27349810 DOI: 10.1038/leu.2016.174] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Revised: 06/02/2016] [Accepted: 06/06/2016] [Indexed: 12/25/2022]
Abstract
Dasatinib treatment markedly increases the number of large granular lymphocytes (LGLs) in a proportion of Ph+ leukemia patients, which associates with a better prognosis. The lymphocytosis is predominantly observed in cytomegalovirus (CMV)-seropositive patients, yet detectable CMV reactivation exists only in a small fraction of patients. Thus, etiology of the lymphocytosis still remains unclear. Here, we identified NK cells as the dominant LGLs expanding in dasatinib-treated patients, and applied principal component analysis (PCA) to an extensive panel of NK cell markers to explore underlying factors in NK cell activation. PCA displayed phenotypic divergence of NK cells that reflects CMV-associated differentiation and genetic differences, and the divergence was markedly augmented in CMV-seropositive dasatinib-treated patients. Notably, the CMV-associated highly differentiated status of NK cells was already observed at leukemia diagnosis, and was further enhanced after starting dasatinib in virtually all CMV-seropositive patients. Thus, the extensive characterization of NK cells by PCA strongly suggests that CMV is an essential factor in the NK cell activation, which progresses stepwise during leukemia and subsequent dasatinib treatment most likely by subclinical CMV reactivation. This study provides a rationale for the exploitation of CMV-associated NK cell activation for treatment of leukemias.
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Affiliation(s)
- K Ishiyama
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - T Kitawaki
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - N Sugimoto
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan.,Department of Clinical Application, Center for iPS Cell Research and Application, Kyoto University, Kyoto, Japan
| | - T Sozu
- Department of Management Science, Faculty of Engineering, Tokyo University of Science, Tokyo, Japan
| | - N Anzai
- Department of Hematology and Oncology, Takatsuki Red Cross Hospital, Takatsuki, Japan
| | - M Okada
- Department of Hematology and Oncology, Takatsuki Red Cross Hospital, Takatsuki, Japan
| | - M Nohgawa
- Department of Hematology, Wakayama Red Cross Hospital, Wakayama, Japan
| | - K Hatanaka
- Department of Hematology, Wakayama Red Cross Hospital, Wakayama, Japan
| | - N Arima
- Department of Hematology, Kitano Hospital, Osaka, Japan
| | - T Ishikawa
- Department of Hematology, Kobe City Medical Center, Kobe, Japan
| | - S Tabata
- Department of Hematology, Kobe City Medical Center, Kobe, Japan
| | - T Onaka
- Department of Hematology, Kokura Memorial Hospital, Kitakyusyu, Japan
| | - S Oka
- Department of Hematology and Oncology, Shiga Medical Center for Adults, Moriyama, Japan
| | - Y Nakabo
- The Center for Hematological Diseases, Takeda General Hospital, Kyoto, Japan
| | - R Amakawa
- Department of Hematology, The Japan Baptist Hospital, Kyoto, Japan
| | - M Matsui
- Department of Hematology, Kyoto City Hospital, Kyoto, Japan
| | - T Moriguchi
- Department of Hematology, Kyoto-Katsura Hospital, Kyoto, Japan
| | - A Takaori-Kondo
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - N Kadowaki
- Department of Internal Medicine, Division of Hematology, Rheumatology and Respiratory Medicine, Faculty of Medicine, Kagawa University, Kagawa, Japan
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30
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Kanazawa T, Seki M, Ishiyama K, Kubo T, Kaneda Y, Sakaguchi M, Izaike Y, Takahashi T. Pregnancy prediction on the day of embryo transfer (Day 7) and Day 14 by measuring luteal blood flow in dairy cows. Theriogenology 2016; 86:1436-1444. [PMID: 27262885 DOI: 10.1016/j.theriogenology.2016.05.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2016] [Revised: 04/29/2016] [Accepted: 05/01/2016] [Indexed: 11/30/2022]
Abstract
This study aimed to assess the suitability of luteal blood flow analyses measured by color Doppler ultrasonography (CDUS), to predict pregnancy at pre- and post-embryo transfer (ET) in dairy cows, and to compare with the established criterion like luteal size and plasma progesterone (P4) concentrations. Lactating Holstein cows (n = 65) with spontaneous (n = 34) or synchronized estrus (n = 31) were examined. Cows with a CL greater than or equal to 20 mm in diameter (n = 58) received embryo transfer on Day 7 (Day 0 = estrus). Brightness mode images were captured for calculation of the CL area, luteal cavity area, and dominant follicle area on Days 3, 5, 7, and 14. Color Doppler ultrasonography examinations were conducted to determine the blood flow area (BFA) within the CL at the maximum diameter and the time-averaged maximum velocity (TAMV) of the base of the spiral artery on the same days. Plasma P4 concentrations were determined from blood samples collected at each ultrasound examination. Pregnancy was diagnosed by an ultrasound on Day 30. There was no significant difference in the proportion of cows received embryo (91.2% vs. 87.1%, P = 0.70) and pregnancy rate (58.1% vs. 59.3%, P = 1.00) between the spontaneous estrus and synchronized groups. The BFA values of the pregnant group (n = 34) were approximately 1.42 and 1.54 times higher than those of the nonpregnant group (n = 24) on Days 7 (0.54 ± 0.04 cm(2) vs. 0.38 ± 0.02 cm(2); P < 0.01) and 14 (0.80 ± 0.23 cm(2) vs. 0.52 ± 0.22 cm(2); P < 0.01), respectively. The TAMV of the pregnant group was approximately 1.45 times higher than that of the nonpregnant group on Day 14 (57.8 ± 3.5 cm/s vs. 40.0 ± 3.3 cm/s; P < 0.01). However, no differences were found in the CL area, CL tissue area, dominant follicle area, and plasma P4 concentrations among these groups. In addition, the best logistic regression model to predict pregnancy included scores for BFA on Day 7, BFA and TAMV on Day 14. Setting the cutoff value of BFA at 0.43 cm(2) yielded the highest sensitivity (79.4%) and specificity (75.0%) on Day 7, indicating the effectiveness of using BFA data for predicting pregnancy on Day 7. Furthermore, setting the cutoff value at one obtained from a sample with BFA 0.63 cm(2) and TAMV 50.60 cm/s yielded the highest sensitivity (85.3%) and specificity (91.7%) on Day 14. In conclusion, the evaluations of BFA on Day 7, and paired BFA and TAMV on Day 14 represent reliable predictors of pregnancy in the cow.
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Affiliation(s)
- Tomomi Kanazawa
- United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan; Miyagi Prefectural Federated Agricultural Mutual Aid Association, Sendai, Japan
| | - Motohide Seki
- Faculty of Science, Kyushu University, Fukuoka, Japan
| | - Keiki Ishiyama
- Graduate School of Agriculture Science, Tohoku University, Sendai, Japan
| | - Tomoaki Kubo
- United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan
| | - Yoshiyuki Kaneda
- United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan
| | - Minoru Sakaguchi
- School of Veterinary Medicine, Kitasato University, Towada, Japan
| | - Yoshiaki Izaike
- United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan; Cooperative Department of Veterinary Medicine, Faculty of Agriculture, Iwate University, Morioka, Japan
| | - Toru Takahashi
- United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan; Cooperative Department of Veterinary Medicine, Faculty of Agriculture, Iwate University, Morioka, Japan.
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Ishiyama K, Takeda J, Kondo T, Sugimoto N, Kawabata H, Kitano T, Takaori-Kondo A. Feasibility of salvage cord blood transplantation following fludarabine, melphalan and low-dose TBI for graft rejection after hematopoietic stem cell transplantation. Bone Marrow Transplant 2016; 51:985-7. [PMID: 26878662 DOI: 10.1038/bmt.2016.16] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- K Ishiyama
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - J Takeda
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - T Kondo
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - N Sugimoto
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan.,Department of Clinical Application, Center for iPS Cell Research and Application (CiRA), Kyoto University, Kyoto, Japan
| | - H Kawabata
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - T Kitano
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - A Takaori-Kondo
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Kawaoka T, Imamura M, Kan H, Fujino H, Fukuhara T, Kobayashi T, Honda Y, Naeshiro N, Hiramatsu A, Tsuge M, Hayes CN, Kawakami Y, Aikata H, Ochi H, Ishiyama K, Tashiro H, Ohdan H, Chayama K. Two patients treated with simeprevir plus pegylated-interferon and ribavirin triple therapy for recurrent hepatitis C after living donor liver transplantation: case report. Transplant Proc 2016; 47:809-14. [PMID: 25891736 DOI: 10.1016/j.transproceed.2014.10.052] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Revised: 10/15/2014] [Accepted: 10/28/2014] [Indexed: 12/22/2022]
Abstract
We previously reported our data on telaprevir (TVR) used in combination with pegylated-interferon and ribavirin (PEG-IFN/RBV) for the treatment of recurrent hepatitis C virus (HCV) genotype 1 infection after liver transplantation (LT). TVR substantially increases the blood levels of immunosuppressive agents such as cyclosporine and tacrolimus for drug-drug interactions. On the other hand, the effect of simeprevir (SMV) on the blood levels of these immunosuppressive agents is unclear. We report 2 patients who achieved viral responses with little effect on the blood levels of cyclosporine and tacrolimus using SMV plus PEG-IFN/RBV treatment. The first was a 71-year-old woman with HCV-related liver cirrhosis and hepatocellular carcinoma who failed to respond to PEG-IFN/RBV after living donor LT. She was treated with 40 mg/d of cyclosporine, and received SMV plus PEG-IFN/RBV treatment. The second was a 65-year-old man with HCV-related liver cirrhosis who failed to respond to PEG-IFN/RBV after living donor LT. He was treated with 3 mg/d of tacrolimus, and received SMV plus PEG-IFN/RBV treatment. Serum HCV RNA became undetectable using TaqMan polymerase chain reaction (PCR) test after 4 weeks of treatment in both patients, and no remarkable fluctuation in blood concentration was observed either in cyclosporine or tacrolimus during the 12 weeks of SMV treatment. Completion of 12-week SMV triple therapy was followed by PEG-IFNα2b plus RBV, and both patients achieved sustained virological response 12 weeks after the end of treatment. SMV plus PEG-IFNRBV treatment showed a remarkable viral response with little effect on blood levels of immunosuppressive agents for recurrent HCV genotype 1 infection after LT.
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Affiliation(s)
- T Kawaoka
- Department of Gastroenterology and Metabolism, Hiroshima University Hospital, Hiroshima, Japan
| | - M Imamura
- Department of Gastroenterology and Metabolism, Hiroshima University Hospital, Hiroshima, Japan
| | - H Kan
- Department of Gastroenterology and Metabolism, Hiroshima University Hospital, Hiroshima, Japan
| | - H Fujino
- Department of Gastroenterology and Metabolism, Hiroshima University Hospital, Hiroshima, Japan
| | - T Fukuhara
- Department of Gastroenterology and Metabolism, Hiroshima University Hospital, Hiroshima, Japan
| | - T Kobayashi
- Department of Gastroenterology and Metabolism, Hiroshima University Hospital, Hiroshima, Japan
| | - Y Honda
- Department of Gastroenterology and Metabolism, Hiroshima University Hospital, Hiroshima, Japan
| | - N Naeshiro
- Department of Gastroenterology and Metabolism, Hiroshima University Hospital, Hiroshima, Japan
| | - A Hiramatsu
- Department of Gastroenterology and Metabolism, Hiroshima University Hospital, Hiroshima, Japan
| | - M Tsuge
- Department of Gastroenterology and Metabolism, Hiroshima University Hospital, Hiroshima, Japan
| | - C N Hayes
- Department of Gastroenterology and Metabolism, Hiroshima University Hospital, Hiroshima, Japan
| | - Y Kawakami
- Department of Gastroenterology and Metabolism, Hiroshima University Hospital, Hiroshima, Japan
| | - H Aikata
- Department of Gastroenterology and Metabolism, Hiroshima University Hospital, Hiroshima, Japan
| | - H Ochi
- Department of Gastroenterology and Metabolism, Hiroshima University Hospital, Hiroshima, Japan
| | - K Ishiyama
- Division of Frontier Medical Science, Department of Surgery, Programs for Biomedical Research, Graduate School of Biomedical Science, Hiroshima University, Hiroshima, Japan
| | - H Tashiro
- Division of Frontier Medical Science, Department of Surgery, Programs for Biomedical Research, Graduate School of Biomedical Science, Hiroshima University, Hiroshima, Japan
| | - H Ohdan
- Division of Frontier Medical Science, Department of Surgery, Programs for Biomedical Research, Graduate School of Biomedical Science, Hiroshima University, Hiroshima, Japan
| | - K Chayama
- Department of Gastroenterology and Metabolism, Hiroshima University Hospital, Hiroshima, Japan.
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Shimizu S, Tanaka Y, Tazawa H, Verma S, Onoe T, Ishiyama K, Ohira M, Ide K, Ohdan H. Fc-Gamma Receptor Polymorphisms Predispose Patients to Infectious Complications After Liver Transplantation. Am J Transplant 2016; 16:625-33. [PMID: 26517570 DOI: 10.1111/ajt.13492] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 08/09/2015] [Accepted: 08/10/2015] [Indexed: 01/25/2023]
Abstract
We investigated the impact of polymorphisms in host innate immunoregulatory genes on the development of infectious complications after liver transplantation (LT). The single-nucleotide polymorphisms (SNPs) of C1QA [276A/G], FCGR2A [131H/R], and FCGR3A [158F/V], genes encoding the Fc gamma receptor (FcγR), were analyzed in 89 living donor LT recipients in relation to the occurrences of postoperative infectious complications within 30 days after LT. Consistent with a lower affinity of the isoform encoded by FCGR3A [158F] to both IgG1 and IgG3, a significantly higher incidence of bloodstream infections (BSI) was observed in the FCGR3A [158F/V or F/F] than in the FCGR3A [158V/V] individuals. The combination of FCGR2A and FCGR3A SNPs further stratified the incidence of BSI, regardless of C1QA SNP. The predominant causative pathogen of BSI in the FCGR3A [158F/F or F/V] patients was gram-positive cocci (73.3%), of which one third was methicillin-resistant Staphylococcus aureus. No differences were observed in the incidence of fungal infections or in cytomegalovirus infections with respect to the three gene polymorphisms. Our findings indicate that FcγR SNPs are predisposing factors for BSI and can predict mortality after LT. This study provides a foundation for further prospective studies on a larger scale.
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Affiliation(s)
- S Shimizu
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Y Tanaka
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - H Tazawa
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - S Verma
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - T Onoe
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.,Institution of Clinical Research, National Hospital Organization Kure Medical Center/Chugoku Cancer Center, Kure, Japan
| | - K Ishiyama
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - M Ohira
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - K Ide
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - H Ohdan
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
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Seki M, Feugier FG, Song XJ, Ashikari M, Nakamura H, Ishiyama K, Yamaya T, Inari-Ikeda M, Kitano H, Satake A. A mathematical model of phloem sucrose transport as a new tool for designing rice panicle structure for high grain yield. Plant Cell Physiol 2015; 56:605-19. [PMID: 25516572 DOI: 10.1093/pcp/pcu191] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Accepted: 11/21/2014] [Indexed: 05/24/2023]
Abstract
Rice (Oryza sativa) is one of the most important food crops in the world. Numerous quantitative trait loci or genes controlling panicle architecture have been identified to increase grain yield. Yet grain yield, defined as the product of the number of well-ripened grains and their weight, is a complex trait that is determined by multiple factors such as source, sink and translocation capacity. Mechanistic modelling capturing capacities of source, sink and transport will help in the theoretical design of crop ideotypes that guarantee high grain yield. Here we present a mathematical model simulating sucrose transport and grain growth within a complex phloem network. The model predicts that the optimal panicle structure for high yield shows a simple grain arrangement with few higher order branches. In addition, numerical analyses revealed that inefficient delivery of carbon to panicles with higher order branches prevails regardless of source capacity, indicating the importance of designing grain arrangement and phloem structure. Our model highlights the previously unexplored effect of grain arrangement on the yield, and provides numerical solutions for optimal panicle structure under various source and sink capacities.
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Affiliation(s)
- Motohide Seki
- Faculty of Environmental Earth Science, Hokkaido University, N10W5, Kita-ku, Sapporo, 060-0810 Japan
| | - François Gabriel Feugier
- Faculty of Environmental Earth Science, Hokkaido University, N10W5, Kita-ku, Sapporo, 060-0810 Japan
| | - Xian-Jun Song
- Bioscience and Biotechnology Center, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601 Japan
| | - Motoyuki Ashikari
- Bioscience and Biotechnology Center, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601 Japan
| | - Haruka Nakamura
- Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, 981-8555 Japan
| | - Keiki Ishiyama
- Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, 981-8555 Japan
| | - Tomoyuki Yamaya
- Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, 981-8555 Japan
| | - Mayuko Inari-Ikeda
- Bioscience and Biotechnology Center, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601 Japan
| | - Hidemi Kitano
- Bioscience and Biotechnology Center, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601 Japan
| | - Akiko Satake
- Faculty of Environmental Earth Science, Hokkaido University, N10W5, Kita-ku, Sapporo, 060-0810 Japan
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Ohashi M, Ishiyama K, Kojima S, Konishi N, Nakano K, Kanno K, Hayakawa T, Yamaya T. Asparagine synthetase1, but not asparagine synthetase2, is responsible for the biosynthesis of asparagine following the supply of ammonium to rice roots. Plant Cell Physiol 2015; 56:769-78. [PMID: 25634963 DOI: 10.1093/pcp/pcv005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Accepted: 01/13/2015] [Indexed: 05/06/2023]
Abstract
Asparagine is synthesized from glutamine by the reaction of asparagine synthetase (AS) and is the major nitrogen form in both xylem and phloem sap in rice (Oryza sativa L.). There are two genes encoding AS, OsAS1 and OsAS2, in rice, but the functions of individual AS isoenzymes are largely unknown. Cell type- and NH4(+)-inducible expression of OsAS1 as well as analyses of knockout mutants were carried out in this study to characterize AS1. OsAS1 was mainly expressed in the roots, with in situ hybridization showing that the corresponding mRNA was specifically accumulated in the three cell layers of the root surface (epidermis, exodermis and sclerenchyma) in an NH4(+)-dependent manner. Conversely, OsAS2 mRNA was abundant in leaf blades and sheathes of rice. Although OsAS2 mRNA was detectable in the roots, its content decreased when NH4(+) was supplied. Retrotransposon-mediated knockout mutants lacking AS1 showed slight stimulation of shoot length and slight reduction in root length at the seedling stage. On the other hand, the mutation caused an approximately 80-90% reduction in free asparagine content in both roots and xylem sap. These results suggest that AS1 is responsible for the synthesis of asparagine in rice roots following the supply of NH4(+). Characteristics of the NH4(+)-dependent increase and the root surface cell-specific expression of OsAS1 gene are very similar to our previous results on cytosolic glutamine synthetase1;2 and NADH-glutamate synthase1 in rice roots. Thus, AS1 is apparently coupled with the primary assimilation of NH4(+) in rice roots.
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Affiliation(s)
- Miwa Ohashi
- Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, 981-8555 Japan
| | - Keiki Ishiyama
- Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, 981-8555 Japan
| | - Soichi Kojima
- Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, 981-8555 Japan
| | - Noriyuki Konishi
- Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, 981-8555 Japan
| | - Kentaro Nakano
- Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, 981-8555 Japan Present address: Cambridge Technology Partners Co. Ltd., 1-1-1 Toyosu, Koto-ku, Tokyo 135-8560 Japan
| | - Keiichi Kanno
- Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, 981-8555 Japan
| | - Toshihiko Hayakawa
- Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, 981-8555 Japan
| | - Tomoyuki Yamaya
- Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, 981-8555 Japan
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Morimoto H, Ishiyama K, Ishifuro M, Ohira M, Ide K, Tanaka Y, Tahara H, Teraoka Y, Yamashita M, Abe T, Hashimoto S, Hirata F, Tanimine N, Saeki Y, Shimizu S, Sakai H, Yano T, Tashiro H, Ohdan H. Clinical efficacy of simultaneous splenectomy in liver transplant recipients with hepatitis C virus. Transplant Proc 2015; 46:770-3. [PMID: 24767345 DOI: 10.1016/j.transproceed.2013.12.034] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Revised: 11/30/2013] [Accepted: 12/11/2013] [Indexed: 12/14/2022]
Abstract
BACKGROUND Interferon (IFN) therapy is a well-established antiviral treatment for hepatitis C virus (HCV) - infected patients. However, susceptibility to thrombocytopenia is a major obstacle in its initiation or continuation, particularly in patients with HCV who underwent liver transplantation (LT). We previously showed that the coexistence of splenomegaly and thrombocytopenia could result in persistent thrombocytopenia after LT. Here we retrospectively evaluated the validity of this criterion for simultaneous splenectomy in recipients with HCV. PATIENTS AND METHODS Subjects included 36 recipients with HCV who received LT between January 2006 and February 2012 at Hiroshima University. We analyzed the spleen volume, body surface area, platelet (PLT) count, and rate of completion or continuation with IFN therapy in these recipients. RESULT Of these recipients, 30 did not require simultaneous splenectomy according to the criterion, and 24 actually did not receive simultaneous splenectomy. In this group, 21 (87.5%) started IFN therapy. Fifteen (71.4%) of these recipients completed or continued IFN therapy, whereas 13 (61.9%) achieved either a sustained virological response (SVR) or an end-of-treatment response. The PLT count increased to >100,000/mm(3) 1 month after LT in 16 (66.7%) recipients from this group. CONCLUSION Our criterion detected the PLT count outcome after LT in recipients with HCV and achieved a better SVR result after IFN therapy.
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Affiliation(s)
- H Morimoto
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - K Ishiyama
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan.
| | - M Ishifuro
- Department of Radiology, Division of Medical Intelligence and Informatics, Programs for Applied Biomedicine, Hiroshima University, Hiroshima, Japan
| | - M Ohira
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - K Ide
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Y Tanaka
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - H Tahara
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Y Teraoka
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - M Yamashita
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - T Abe
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - S Hashimoto
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - F Hirata
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - N Tanimine
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Y Saeki
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - S Shimizu
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - H Sakai
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - T Yano
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - H Tashiro
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - H Ohdan
- Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
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Ohashi M, Ishiyama K, Kusano M, Fukushima A, Kojima S, Hanada A, Kanno K, Hayakawa T, Seto Y, Kyozuka J, Yamaguchi S, Yamaya T. Lack of cytosolic glutamine synthetase1;2 in vascular tissues of axillary buds causes severe reduction in their outgrowth and disorder of metabolic balance in rice seedlings. Plant J 2015; 81:347-56. [PMID: 25429996 DOI: 10.1111/tpj.12731] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Revised: 11/03/2014] [Accepted: 11/19/2014] [Indexed: 05/20/2023]
Abstract
The development and elongation of active tillers in rice was severely reduced by a lack of cytosolic glutamine synthetase1;2 (GS1;2), and, to a lesser extent, lack of NADH-glutamate synthase1 in knockout mutants. In situ hybridization using the basal part of wild-type seedlings clearly showed that expression of OsGS1;2 was detected in the phloem companion cells of the nodal vascular anastomoses and large vascular bundles of axillary buds. Accumulation of lignin, visualized using phloroglucin HCl, was also observed in these tissues. The lack of GS1;2 resulted in reduced accumulation of lignin. Re-introduction into the mutants of OsGS1;2 cDNA under the control of its own promoter successfully restored the outgrowth of tillers and lignin deposition to wild-type levels. Transcriptomic analysis using a 5 mm basal region of rice shoots showed that the GS1;2 mutants accumulated reduced amounts of mRNAs for carbon and nitrogen metabolism, including C1 unit transfer in lignin synthesis. Although a high content of strigolactone in rice roots is known to reduce active tiller number, the reduction of outgrowth of axillary buds observed in the GS1;2 mutants was independent of the level of strigolactone. Thus metabolic disorder caused by the lack of GS1;2 resulted in a severe reduction in the outgrowth of axillary buds and lignin deposition.
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Affiliation(s)
- Miwa Ohashi
- Graduate School of Agriculture Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, 981-8555, Japan
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Konishi N, Ishiyama K, Matsuoka K, Maru I, Hayakawa T, Yamaya T, Kojima S. NADH-dependent glutamate synthase plays a crucial role in assimilating ammonium in the Arabidopsis root. Physiol Plant 2014; 152:138-51. [PMID: 24576214 DOI: 10.1111/ppl.12177] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Revised: 01/28/2014] [Accepted: 01/29/2014] [Indexed: 05/21/2023]
Abstract
Plant roots under nitrogen deficient conditions with access to both ammonium and nitrate ions, will take up ammonium first. This preference for ammonium rather than nitrate emphasizes the importance of ammonium assimilation machinery in roots. Glutamine synthetase (GS) and glutamate synthase (GOGAT) catalyze the conversion of ammonium and 2-oxoglutarate to glutamine and glutamate. Higher plants have two GOGAT species, ferredoxin-dependent glutamate synthase (Fd-GOGAT) and nicotinamide adenine dinucleotide (NADH)-GOGAT. While Fd-GOGAT participates in the assimilation of ammonium, which is derived from photorespiration in leaves, NADH-GOGAT is highly expressed in roots and its importance needs to be elucidated. While ammonium as a minor nitrogen form in most soils is directly taken up, nitrate as the major nitrogen source needs to be converted to ammonium prior to uptake. The aim of this study was to investigate and quantify the contribution of NADH-GOGAT to the ammonium assimilation in Arabidopsis (Arabidopsis thaliana Columbia) roots. Quantitative real-time polymerase chain reaction (PCR) and protein gel blot analysis showed an accumulation of NADH-GOGAT in response to ammonium supplied to the roots. In addition the localization of NADH-GOGAT and Fd-GOGAT did not fully overlap. Promoter-β-glucuronidase (GUS) fusion analysis and immunohistochemistry showed that NADH-GOGAT was highly accumulated in non-green tissue like vascular bundles, shoot apical meristem, pollen, stigma and roots. Reverse genetic approaches suggested a reduction in glutamate production and biomass accumulation in NADH-GOGAT transfer DNA (T-DNA) insertion lines under normal CO2 condition. The data emphasize the importance of NADH-GOGAT in the ammonium assimilation in Arabidopsis roots.
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Affiliation(s)
- Noriyuki Konishi
- Graduate School of Agricultural Science, Tohoku University, Sendai, 9818555, Japan
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Sakai H, Ishiyama K, Tanaka Y, Ide K, Ohira M, Tahara H, Abe T, Hirata F, Morimoto H, Hashimoto S, Tanimine N, Saeki Y, Shimizu S, Yano T, Kobayashi T, Tashiro H, Ohdan H. Potential Benefit of Mixed Lymphocyte Reaction Assay-based Immune Monitoring After Living Donor Liver Transplantation for Recipients With Autoimmune Hepatitis. Transplant Proc 2014; 46:785-9. [DOI: 10.1016/j.transproceed.2013.11.123] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Accepted: 11/07/2013] [Indexed: 12/22/2022]
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Morimoto H, Ide K, Tanaka Y, Ishiyama K, Ohira M, Tahara H, Teraoka Y, Yamashita M, Abe T, Hashimoto S, Hirata F, Tanimine N, Saeki Y, Shimizu S, Sakai H, Yano T, Tashiro H, Ohdan H. Bile CXC Motif Chemokine 10 Levels Correlate With Anti-donor Cytotoxic T Cell Responses After Liver Transplantation. Transplant Proc 2014; 46:790-3. [DOI: 10.1016/j.transproceed.2013.11.092] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Accepted: 11/15/2013] [Indexed: 11/25/2022]
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Kojima S, Konishi N, Beier MP, Ishiyama K, Maru I, Hayakawa T, Yamaya T. NADH-dependent glutamate synthase participated in ammonium assimilation in Arabidopsis root. Plant Signal Behav 2014; 9:e29402. [PMID: 25763622 PMCID: PMC4203567 DOI: 10.4161/psb.29402] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Revised: 05/29/2014] [Accepted: 05/29/2014] [Indexed: 05/24/2023]
Abstract
Higher plants have 2 GOGAT species, Fd-GOGAT and NADH-GOGAT. While Fd-GOGAT mainly assimilates ammonium in leaves, which is derived from photorespiration, the function of NADH-GOGAT, which is highly expressed in roots, (1) needs to be elucidated. The aim of this study was to clarify the role of NADH-GOGAT in Arabidopsis roots. The supply of ammonium to the roots caused an accumulation of NADH-GOGAT, while Fd-GOGAT 1 and Fd-GOGAT 2 showed no response. A promoter-GUS fusion analysis and immunohistochemistry showed that NADH-GOGAT was located in non-green tissues like vascular bundles, shoot apical meristem, pollen, stigma, and roots. The localization of NADH-GOGAT and Fd-GOGAT was not overlapped. NADH-GOGAT T-DNA insertion lines showed a reduction of glutamate and biomass under normal CO2 conditions. These data emphasizes the importance of NADH-GOGAT in the ammonium assimilation of Arabidopsis roots.
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Ishiyama K, Tamura N, Yashiro T, Nishiyama C, Okumura K, Takasaki Y. FRI0037 Role of a transcription factor pu.1 in tgf-b signaling-mediated osteoclast differentiation. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.1165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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43
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Sakai H, Ide K, Ishiyama K, Onoe T, Tazawa H, Hotta R, Teraoka Y, Yamashita M, Abe T, Hirata F, Morimoto H, Hashimoto S, Tashiro H, Ohdan H. Renal vein extension using an autologous renal vein in a living donor with double inferior vena cava: a case report. Transplant Proc 2012; 44:1446-9. [PMID: 22664033 DOI: 10.1016/j.transproceed.2011.11.065] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2011] [Accepted: 11/23/2011] [Indexed: 10/28/2022]
Abstract
BACKGROUND When the kidney from a living donor with a double inferior vena cava (IVC) is harvested for renal transplantation, the short length of the renal vein may eventually create a technical problem for graft implantation. Herein, we have reported a rare case of renal vein extension using an autologous renal vein in a living donor with a double IVC. CASE REPORT A 70-year-old man with end-stage renal disease owing to autosomal-dominant polycystic kidney disease underwent a living donor kidney graft from his wife who had a double IVC. Because of the enlarged kidneys, the patient underwent a bilateral native nephrectomy with concomitant renal transplantation to create space in the pelvis. At nephrectomy, the recipient's renal vein was used to extend the donor renal vein. On the back table, the vein graft was sutured to the donor renal vein, permitting a 3.0-cm extension. RESULTS The transplantation was performed safely without any complications; the recipient's renal function and blood flow were excellent after the operation. CONCLUSION This case illustrated that an autologous renal vein graft is a preferable option to extend of short donor renal vein for recipients who require a simultaneous native nephrectomy.
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Affiliation(s)
- H Sakai
- Department of Surgery, Division of Frontier Medical Science, Programs for Biomedical Research, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan
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Tanaka Y, Tashiro H, Onoe T, Ide K, Ishiyama K, Ohdan H. Optimization of immunosuppressive therapy based on a multiparametric mixed lymphocyte reaction assay reduces infectious complications and mortality in living donor liver transplant recipients. Transplant Proc 2012; 44:555-9. [PMID: 22410068 DOI: 10.1016/j.transproceed.2012.01.038] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
AIM We investigated the clinical relevance of immune monitoring by a multiparametric mixed lymphocyte reaction (MLR) assay, wherein the number and phenotype of alloreactive precursors can be quantified by combining the results of carboxyfluorescein diacetate succinimidyl ester labeling and flow cytometry analysis. METHODS In 51 adult patients undergoing living donor liver transplantation (OLT), immunosuppressive drugs were dosed on the basis of immune monitoring by the MLR assay (optimized protocol: group O). In 64 other patients, the agents were prescribed according to empirical regimens (empirical protocol: group E). In group O, MLR assays were performed at 2- to 4-week intervals until 3 months after OLT and thereafter at 3- to 6-month intervals. Therapeutic adjustments for immunosuppressants were determined by tapering the doses in cases of anti-donor hyporesponsiveness for both CD4+ and CD8+ T-cell subsets. RESULTS The 1-year patient and graft survivals in groups O versus E were 90.2% versus 76.6%, respectively. The incidence of acute rejection episodes (ARE) among group O (13.7%) were lower than in cohort E (28.1%). None of the patients in group O while four patients (3%) in group E already have shown chronic rejection to date. The incidences of bacteremia and fungal infections in group O (9.8% and 7.5%, respectively) were lower than in cohort E (18.8% and 12.6%, respectively). CONCLUSION A multiparametric MLR assay may facilitate the development of adequate immunosuppressive regimens.
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Affiliation(s)
- Y Tanaka
- Department of Surgery, Division of Frontier Medical Science, Programs for Biomedical Research, Graduate School of Biomedical Science, Hiroshima University, Hiroshima, Japan
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Hosokawa K, Yamazaki H, Mochizuki K, Ohata K, Ishiyama K, Hayashi T, Kondo Y, Sugimori N, Okumura H, Takami A, Nakao S. Successful treatment of Trichosporon fungemia in a patient with refractory acute myeloid leukemia using voriconazole combined with liposomal amphotericin B. Transpl Infect Dis 2011; 14:184-7. [PMID: 22093149 DOI: 10.1111/j.1399-3062.2011.00670.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2010] [Revised: 02/27/2011] [Accepted: 06/28/2011] [Indexed: 11/27/2022]
Abstract
Trichosporon fungemia is a rare and fatal fungal infection that occurs in patients with prolonged neutropenia associated with hematologic malignancies. A 21-year-old male developed Trichosporon fungemia during remission induction therapy for acute myeloid leukemia (AML). Although two courses of induction therapy failed to induce a remission of AML, combination therapy with voriconazole and liposomal amphotericin B (L-AmB) followed by monocyte colony-stimulating factor ameliorated the Trichosporon fungemia and enabled the patient to receive reduced-intensity bone marrow transplantation (BMT) from his human leukocyte antigen-A one-locus mismatched mother. The patient achieved a durable remission after BMT without exacerbation of Trichosporon fungemia. The combination therapy with voriconazole and L-AmB may therefore be useful in controlling Trichosporon fungemia associated with prolonged neutropenia after remission induction therapy for AML.
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Affiliation(s)
- K Hosokawa
- Cellular Transplantation Biology, Kanazawa University Graduate School of Medical Science, Kanazawa, Japan.
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Ishiyama K, Takami A, Kanda Y, Nakao S, Hidaka M, Maeda T, Naoe T, Taniguchi S, Kawa K, Nagamura T, Atsuta Y, Sakamaki H. Allogeneic hematopoietic stem cell transplantation for acute myeloid leukemia with t(6;9)(p23;q34) dramatically improves the patient prognosis: a matched-pair analysis. Leukemia 2011; 26:461-4. [PMID: 21869835 DOI: 10.1038/leu.2011.229] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Acute myeloid leukemia (AML) with t(6;9)(p23;q34) is well known to have a poor prognosis treated with chemotherapy and autotransplantation. The presence of this karyotype is an indicator for allogeneic hematopoietic stem cell transplantation (HSCT); however, the impact of t(6;9)(p23;q34) on the HSCT outcome remains unclear. We conducted a matched-pair analysis of de novo AML patients with and without t(6;9)(p23;q34) using data obtained from the Japanese HSCT data registry. A total of 57 patients with t(6;9)(p23;q34) received transplants between 1996 and 2007, and 171 of 2056 normal karyotype patients matched for age, disease status at HSCT and graft source were selected. The overall survival, disease-free survival, cumulative incidence of relapse and the non-relapse mortality in t(6;9)(p23;q34) patients were comparable to those for normal karyotype patients. A univariate analysis showed that t(6;9)(p23;q34) had no significant impact on the overall survival. These findings suggest that allogeneic HSCT may overcome the unfavorable impact of t(6;9)(p23;q34) as an independent prognostic factor.
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Affiliation(s)
- K Ishiyama
- Department of Cellular Transplantation Biology, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan.
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Omori K, Mitsuhashi M, Ishiyama K, Nair I, Rawson J, Todorov I, Kandeel F, Mullen Y. mRNA of the pro-apoptotic gene BBC3 serves as a molecular marker for TNF-α-induced islet damage in humans. Diabetologia 2011; 54:2056-66. [PMID: 21567299 DOI: 10.1007/s00125-011-2183-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2010] [Accepted: 04/04/2011] [Indexed: 12/23/2022]
Abstract
AIMS/HYPOTHESIS TNF-α plays important roles in the pathogenesis of type 1 and type 2 diabetes mellitus. In light of this, we examined the involvement of a pro-apoptotic gene, BBC3 (also known as PUMA), in TNF-α-mediated beta cell dysfunction and destruction in human islets. METHODS Human islets were exposed in vitro to TNF-α alone or in combination with IFN-γ. Gene expression was assessed by RT-PCR using a set of single islets. Protein abundance and cellular localisation of BBC3 were assessed by immunoblot and immunohistochemistry. A marginal number of islets were transplanted into diabetic NODscid mice to correlate in vivo islet function with BBC3 expression. RESULTS BBC3 and IL8 mRNA were upregulated in TNF-α-stimulated islets in a dose-dependent manner and enhanced through addition of IFN-γ, but not upregulated by IFN-γ alone. Immunohistochemistry revealed that TNF-α in combination with IFN-γ upregulated basal BBC3 abundance in the cytoplasm of beta cells along with the perinuclear clustering of mitochondria partially co-localised with BBC3. TNF-α alone did not induce beta cell death, but did abrogate preproinsulin precursor mRNA synthesis in response to high glucose stimulation, which was inversely associated with upregulation of BBC3 mRNA expression by TNF-α. Higher BBC3 mRNA expression in islets correlated with decreased graft function in vivo. CONCLUSIONS/INTERPRETATION These results suggest that BBC3 mRNA can serve as a molecular marker to detect early TNF-α-induced beta cell stress and may help identify islet-protective compounds for the treatment of diabetes.
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Affiliation(s)
- K Omori
- Beckman Research Institute of the City of Hope, 1500 East Duarte Rd, Duarte, CA 91010, USA.
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Ishiyama K, Katagiri T, Ohata K, Hosokawa K, Kondo Y, Yamazaki H, Takami A, Nakao S. Safety of pre-engraftment prophylactic foscarnet administration after allogeneic stem cell transplantation. Transpl Infect Dis 2011; 14:33-9. [DOI: 10.1111/j.1399-3062.2011.00662.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Ohira M, Nishida S, Tryphonopoulos P, Tekin A, Selvaggi G, Moon J, Levi D, Feun LG, Ruiz P, Ricordi C, Ishiyama K, Ohdan H, Tzakis A. A novel concept of adoptive immunotherapy using interleukin-2-stimulated liver natural killer cells for treatment of liver transplantation with hepatocellular carcinoma. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e13006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Hidaka S, Okamoto Y, Ishiyama K, Hashimoto K. Inhibition of the formation of oral calcium phosphate precipitates: the possible effects of certain honeybee products. J Periodontal Res 2008; 43:450-8. [DOI: 10.1111/j.1600-0765.2008.01088.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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