1
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Hao N, Yao H, Suzuki M, Li B, Wang C, Cao J, Fujiwara T, Wu T, Kamiya T. Novel lignin-based extracellular barrier in glandular trichome. Nat Plants 2024; 10:381-389. [PMID: 38374437 DOI: 10.1038/s41477-024-01626-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 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: 05/05/2023] [Accepted: 01/16/2024] [Indexed: 02/21/2024]
Abstract
Successful biochemical reactions in organisms necessitate compartmentalization of the requisite components. Glandular trichomes (GTs) act as compartments for the synthesis and storage of specialized compounds. These compounds not only are crucial for the survival of plants under biotic and abiotic stresses but also have medical and commercial value for humans. However, the mechanisms underlying compartmentalization remain unclear. Here we identified a novel structure that is indispensable for the establishment of compartments in cucumber GTs. Silica, a specialized compound, is deposited on the GTs and is visible on the surface of the fruit as a white powder, known as bloom. This deposition provides resistance against pathogens and prevents water loss from the fruits1. Using the cucumber bloomless mutant2, we discovered that a lignin-based cell wall structure in GTs, named 'neck strip', achieves compartmentalization by acting as an extracellular barrier crucial for the silica polymerization. This structure is present in the GTs of diverse plant species. Our findings will enhance the understanding of the biosynthesis of unique compounds in trichomes and provide a basis for improving the production of compounds beneficial to humans.
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Affiliation(s)
- Ning Hao
- College of Horticulture/Yuelu Mountain Laboratory of Hunan Province, Hunan Agricultural University, Changsha, China
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo, Japan
| | - Hongxin Yao
- College of Horticulture/Yuelu Mountain Laboratory of Hunan Province, Hunan Agricultural University, Changsha, China
| | - Michio Suzuki
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo, Japan
| | - Baohai Li
- MOE Key Laboratory of Environment Remediation and Ecological Health, College of Environmental and Resource Science, Zhejiang University, Hangzhou, China
| | - Chunhua Wang
- College of Horticulture/Yuelu Mountain Laboratory of Hunan Province, Hunan Agricultural University, Changsha, China
| | - Jiajian Cao
- College of Horticulture/Yuelu Mountain Laboratory of Hunan Province, Hunan Agricultural University, Changsha, China
| | - Toru Fujiwara
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo, Japan
| | - Tao Wu
- College of Horticulture/Yuelu Mountain Laboratory of Hunan Province, Hunan Agricultural University, Changsha, China.
| | - Takehiro Kamiya
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo, Japan.
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2
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Ito M, Tajima Y, Ogawa-Ohnishi M, Nishida H, Nosaki S, Noda M, Sotta N, Kawade K, Kamiya T, Fujiwara T, Matsubayashi Y, Suzaki T. IMA peptides regulate root nodulation and nitrogen homeostasis by providing iron according to internal nitrogen status. Nat Commun 2024; 15:733. [PMID: 38286991 PMCID: PMC10825120 DOI: 10.1038/s41467-024-44865-4] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Accepted: 01/06/2024] [Indexed: 01/31/2024] Open
Abstract
Legumes control root nodule symbiosis (RNS) in response to environmental nitrogen availability. Despite the recent understanding of the molecular basis of external nitrate-mediated control of RNS, it remains mostly elusive how plants regulate physiological processes depending on internal nitrogen status. In addition, iron (Fe) acts as an essential element that enables symbiotic nitrogen fixation; however, the mechanism of Fe accumulation in nodules is poorly understood. Here, we focus on the transcriptome in response to internal nitrogen status during RNS in Lotus japonicus and identify that IRON MAN (IMA) peptide genes are expressed during symbiotic nitrogen fixation. We show that LjIMA1 and LjIMA2 expressed in the shoot and root play systemic and local roles in concentrating internal Fe to the nodule. Furthermore, IMA peptides have conserved roles in regulating nitrogen homeostasis by adjusting nitrogen-Fe balance in L. japonicus and Arabidopsis thaliana. These findings indicate that IMA-mediated Fe provision plays an essential role in regulating nitrogen-related physiological processes.
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Affiliation(s)
- Momoyo Ito
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Yuri Tajima
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
- Rhelixa Inc., Tokyo, Japan
| | - Mari Ogawa-Ohnishi
- Division of Biological Science, Graduate School of Science, Nagoya University, Nagoya, Aichi, Japan
| | - Hanna Nishida
- Institute of Agrobiological Sciences, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, Japan
| | - Shohei Nosaki
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
- Tsukuba Plant-Innovation Research Center, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Momona Noda
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Naoyuki Sotta
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Kensuke Kawade
- Division of Symbiotic Systems, National Institute for Basic Biology, Okazaki, Aichi, Japan
- School of Life Science, The Graduate University for Advanced Studies (SOKENDAI), Okazaki, Aichi, Japan
- Graduate School of Science and Engineering, Saitama University, Saitama-city, Saitama, Japan
| | - Takehiro Kamiya
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Toru Fujiwara
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Yoshikatsu Matsubayashi
- Division of Biological Science, Graduate School of Science, Nagoya University, Nagoya, Aichi, Japan
| | - Takuya Suzaki
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan.
- Tsukuba Plant-Innovation Research Center, University of Tsukuba, Tsukuba, Ibaraki, Japan.
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3
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Ariza AA, Sotta N, Fujiwara T, Guo W, Kamiya T. A Multi-Target Regression Method to Predict Element Concentrations in Tomato Leaves Using Hyperspectral Imaging. Plant Phenomics 2024; 6:0146. [PMID: 38629079 PMCID: PMC11020135 DOI: 10.34133/plantphenomics.0146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Accepted: 01/09/2024] [Indexed: 04/19/2024]
Abstract
Recent years have seen the development of novel, rapid, and inexpensive techniques for collecting plant data to monitor the nutritional status of crops. These techniques include hyperspectral imaging, which has been widely used in combination with machine learning models to predict element concentrations in plants. When there are multiple elements, the machine learning models are trained with spectral features to predict individual element concentrations; this type of single-target prediction is known as single-target regression. Although this method can achieve reliable accuracy for some elements, there are others that remain less accurate. We aimed to improve the accuracy of element concentration predictions by using a multi-target regression method that sequentially augmented the original input features (hyperspectral imaging) by chaining the predicted element concentration values. To evaluate the multi-target method, the concentrations of 17 elements in tomato leaves were predicted and compared with the single-target regression results. We trained 5 machine learning models with hyperspectral data and predicted element concentration values and found a significant improvement in the prediction accuracy for 10 elements (Mg, P, S, Mn, Fe, Co, Cu, Sr, Mo, and Cd). Furthermore, our multi-target regression method outperformed single-target predictions by increasing the coefficient of determination (R2) for elements such as Mn, Cu, Co, Fe, and Mg by 12.5%, 10.3%, 11%, 10%, and 8.4%, respectively. Hence, our multi-target method can improve the accuracy of predicting 10-element concentrations compared to single-target regression.
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Affiliation(s)
- Andrés Aguilar Ariza
- Graduate School of Agricultural and Life Sciences,
The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Naoyuki Sotta
- Graduate School of Agricultural and Life Sciences,
The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Toru Fujiwara
- Graduate School of Agricultural and Life Sciences,
The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Wei Guo
- Institute for Sustainable Agro-Ecosystem Services, Graduate School of Agricultural and Life Sciences,
The University of Tokyo, 1-1-1, Midoricho, Nishitokyo-shi, Tokyo 188-0002, Japan
| | - Takehiro Kamiya
- Graduate School of Agricultural and Life Sciences,
The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
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4
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Hashimoto S, Shikanai Y, Kusajima M, Nakamura H, Fujiwara T, Kamiya T. Inhibition of NPR1 Leads to Shoot Growth Improvement under Low-Calcium Conditions in Arabidopsis. Plant Cell Physiol 2023; 64:1579-1589. [PMID: 37650642 PMCID: PMC10734893 DOI: 10.1093/pcp/pcad096] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 08/09/2023] [Accepted: 08/30/2023] [Indexed: 09/01/2023]
Abstract
Under low-Ca conditions, plants accumulate salicylic acid (SA) and induce SA-responsive genes. However, the relationship between SA and low-Ca tolerance remains unclear. Here, we demonstrated that the inhibition or suppression of nonexpressor of pathogenesis-related 1 (NPR1) activity, a major regulator of the SA signaling pathway in the defense response, improves shoot growth under low-Ca conditions. Furthermore, mutations in phytoalexin-deficient 4 (PAD4) or enhanced disease susceptibility 1 (EDS1), which are upstream regulators of NPR1, improved shoot growth under low-Ca conditions, suggesting that NPR1 suppressed growth under low-Ca conditions. In contrast, growth of SA induction-deficient 2-2 (sid2-2), which is an SA-deficient mutant, was sensitive to low Ca levels, suggesting that SA accumulation by SID2 was not related to growth inhibition under low-Ca conditions. Additionally, npr1-1 showed low-Ca tolerance, and the application of tenoxicam-an inhibitor of the NPR1-mediated activation of gene expression-also improved shoot growth under low Ca conditions. The low-Ca tolerance of double mutants pad4-1, npr1-1 and eds1-22 npr1-1 was similar to that of the single mutants, suggesting that PAD4 and EDS1 are involved in the same genetic pathway in suppressing growth under low-Ca conditions as NPR1. Cell death and low-Ca tolerance did not correlate among the mutants, suggesting that growth improvement in the mutants was not due to cell death inhibition. In conclusion, we revealed that NPR1 suppresses plant growth under low-Ca conditions and that the other SA-related genes influence plant growth and cell death.
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Affiliation(s)
| | - Yusuke Shikanai
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657 Japan
- Department of Agricultural Chemistry, Tokyo University of Agriculture, Setagaya-ku, Tokyo, 156-8502 Japan
| | - Miyuki Kusajima
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657 Japan
| | - Hidemitsu Nakamura
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657 Japan
| | - Toru Fujiwara
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657 Japan
| | - Takehiro Kamiya
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657 Japan
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5
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Aguilar-Ariza A, Ishii M, Miyazaki T, Saito A, Khaing HP, Phoo HW, Kondo T, Fujiwara T, Guo W, Kamiya T. UAV-based individual Chinese cabbage weight prediction using multi-temporal data. Sci Rep 2023; 13:20122. [PMID: 37978327 PMCID: PMC10656565 DOI: 10.1038/s41598-023-47431-y] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 11/14/2023] [Indexed: 11/19/2023] Open
Abstract
The use of unmanned aerial vehicles (UAVs) has facilitated crop canopy monitoring, enabling yield prediction by integrating regression models. However, the application of UAV-based data to individual-level harvest weight prediction is limited by the effectiveness of obtaining individual features. In this study, we propose a method that automatically detects and extracts multitemporal individual plant features derived from UAV-based data to predict harvest weight. We acquired data from an experimental field sown with 1196 Chinese cabbage plants, using two cameras (RGB and multi-spectral) mounted on UAVs. First, we used three RGB orthomosaic images and an object detection algorithm to detect more than 95% of the individual plants. Next, we used feature selection methods and five different multi-temporal resolutions to predict individual plant weights, achieving a coefficient of determination (R2) of 0.86 and a root mean square error (RMSE) of 436 g/plant. Furthermore, we achieved predictions with an R2 greater than 0.72 and an RMSE less than 560 g/plant up to 53 days prior to harvest. These results demonstrate the feasibility of accurately predicting individual Chinese cabbage harvest weight using UAV-based data and the efficacy of utilizing multi-temporal features to predict plant weight more than one month prior to harvest.
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Affiliation(s)
- Andrés Aguilar-Ariza
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Masanori Ishii
- Institute for Sustainable Agro-Ecosystem Services, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Midoricho, Nishitokyo-shi, Tokyo, 188-0002, Japan
| | - Toshio Miyazaki
- Nippon Norin Seed Co., 6-6-5 Takinogawa, Kita-ku, Tokyo, 114-0023, Japan
| | - Aika Saito
- Nippon Norin Seed Co., 6-6-5 Takinogawa, Kita-ku, Tokyo, 114-0023, Japan
| | | | - Hnin Wint Phoo
- Nippon Norin Seed Co., 6-6-5 Takinogawa, Kita-ku, Tokyo, 114-0023, Japan
| | - Tomohiro Kondo
- Nippon Norin Seed Co., 6-6-5 Takinogawa, Kita-ku, Tokyo, 114-0023, Japan
| | - Toru Fujiwara
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Wei Guo
- Institute for Sustainable Agro-Ecosystem Services, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Midoricho, Nishitokyo-shi, Tokyo, 188-0002, Japan
| | - Takehiro Kamiya
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan.
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6
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Wu Q, Feng Z, Tsukagoshi H, Yang M, Ao Y, Fujiwara T, Kamiya T. Early differentiation of Casparian strip mediated by nitric oxide is required for efficient K transport under low K conditions in Arabidopsis. Plant J 2023; 116:467-477. [PMID: 37422899 DOI: 10.1111/tpj.16384] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 01/17/2023] [Revised: 06/22/2023] [Accepted: 06/29/2023] [Indexed: 07/11/2023]
Abstract
The Casparian strip (CS) is a cell wall modification made of lignin that functions as an apoplastic barrier in the root endodermis to restrict nutrient and water transport between the soil and stele. CS formation is affected by nutritional conditions, and its physiological roles have been discussed. This study found that low K condition affects CS permeability, lignin deposition, and MYB36 mRNA accumulation. To understand the mechanism underlying these findings, we focused on nitric oxide (NO). NO is known to act as a signaling molecule and participates in cell wall synthesis, especially for lignin composition. However, the mechanism by which NO affects lignin deposition and corrects CS formation in the plant roots remains unclear. Through combining fluorescent observation with histological stains, we demonstrated that the root endodermal cell lignification response to low-potassium (K) conditions is mediated by NO through the MYB36-associated lignin-polymerizing pathway. Furthermore, we discovered the noteworthy ability of NO to maintain nutrient homeostasis for adaptation to low K conditions by affecting the correct apoplastic barrier formation of CS. Collectively, our results suggest that NO is required for the lignification and apoplastic barrier formation in the root endodermis during adaptation to low K conditions, which revealing the novel physiological roles of CS under low nutrient conditions and making a significant contribution to CS biology.
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Affiliation(s)
- Qi Wu
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Zhihang Feng
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Hironaka Tsukagoshi
- Faculty of Agriculture, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya, 464-8601, Aichi, Japan
| | - Miaoyan Yang
- Suzhou Chien-Shiung Institute of Technology, Suzhou, 215411, China
| | - Yan Ao
- Suzhou Chien-Shiung Institute of Technology, Suzhou, 215411, China
| | - Toru Fujiwara
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Takehiro Kamiya
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
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7
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Sotta N, Sakamoto T, Kamiya T, Tabata R, Yamaguchi K, Shigenobu S, Yamada M, Hasebe M, Sawa S, Fujiwara T. NAC103 mutation alleviates DNA damage in an Arabidopsis thaliana mutant sensitive to excess boron. Front Plant Sci 2023; 14:1099816. [PMID: 37063182 PMCID: PMC10090426 DOI: 10.3389/fpls.2023.1099816] [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: 11/16/2022] [Accepted: 02/28/2023] [Indexed: 06/19/2023]
Abstract
Excess boron (B) is toxic to plants and thereby causes DNA damage and cell death in root meristems. However, the underlying mechanisms which link boron and DNA damage remain unclear. It has been reported that the rpt5a-6 mutant of the 26S proteasome is sensitive to excess boron, resulting in more frequent cell death in root meristem and reduced root elongation. In this study, we showed that a reduction in root growth in the rpt5a mutant in the presence of high boron levels is repressed by a mutation in NAC domain containing transcription factor NAC103, a substrate of the proteasome, which functions in the unfolded protein response pathway. The mutation in NAC103 alleviated excess-B-induced DNA damage and cell death in root meristems of the rpt5a mutant. Superoxide ( O 2 - ) staining with nitroblue tetrazolium revealed that boron stress causes O 2 - accumulation in root tips, which was higher in the rpt5a-6 mutant, whereas the accumulation was lower in the rpt5a-6 nac103-3 double mutant. Our work demonstrates the overall involvement of NAC103 in maintaining healthy root meristem under excess boron conditions in the absence of RPT5A proteasome subunit.
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Affiliation(s)
- Naoyuki Sotta
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Takuya Sakamoto
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, Tokyo, Japan
| | - Takehiro Kamiya
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Ryo Tabata
- Graduate School of Science and Technology, Kumamoto University, Kumamoto, Japan
- Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
| | - Katsushi Yamaguchi
- National Institutes for Basic Biology, National Institutes of Natural Sciences, Okazaki, Japan
| | - Shuji Shigenobu
- National Institutes for Basic Biology, National Institutes of Natural Sciences, Okazaki, Japan
- School of Life Science, Graduate University for Advanced Studies, Okazaki, Japan
| | - Masashi Yamada
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan
- Biotechnology Center in Southern Taiwan, Academia Sinica, Tainan, Taiwan
| | - Mitsuyasu Hasebe
- National Institutes for Basic Biology, National Institutes of Natural Sciences, Okazaki, Japan
- School of Life Science, Graduate University for Advanced Studies, Okazaki, Japan
| | - Shinichiro Sawa
- Graduate School of Science and Technology, Kumamoto University, Kumamoto, Japan
- International Research Center for Agricultural & Environmental Biology, Kumamoto University, Kumamoto, Japan
| | - Toru Fujiwara
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
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8
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Kumagai S, Watanabe E, Hayashi N, Kimura Y, Kamiya T, Nagashima A, Ushio K, Imaizumi G, Kim J, Munakata K, Umezawa T, Hirose S, Kasai K, Fujiwara T, Romero MF, Kato A. Boric acid transport activity of marine teleost aquaporins expressed in Xenopus oocytes. Physiol Rep 2023; 11:e15655. [PMID: 36967473 PMCID: PMC10040401 DOI: 10.14814/phy2.15655] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 03/06/2023] [Accepted: 03/09/2023] [Indexed: 03/29/2023] Open
Abstract
Marine teleosts ingest large amounts of seawater containing various ions, including 0.4 mM boric acid, which can accumulate at toxic levels in the body. However, the molecular mechanisms by which marine teleosts absorb and excrete boric acid are not well understood. Aquaporins (Aqps) are homologous to the nodulin-like intrinsic protein (NIP) family of plant boric acid channels. To investigate the potential roles of Aqps on boric acid transport across the plasma membrane in marine teleosts, we analyzed the function of Aqps of Japanese pufferfish (Takifugu rubripes) expressed in Xenopus laevis oocytes. Takifugu genome database contains 16 genes encoding the aquaporin family members (aqp0a, aqp0b, aqp1aa, aqp1ab, aqp3a, aqp4a, aqp7, aqp8bb, aqp9a, aqp9b, aqp10aa, aqp10bb, aqp11a, aqp11b, aqp12, and aqp14). When T. rubripes Aqps (TrAqps) were expressed in X. laevis oocytes, a swelling assay showed that boric acid permeability was significantly increased in oocytes expressing TrAqp3a, 7, 8bb, 9a, and 9b. The influx of boric acid into these oocytes was also confirmed by elemental quantification. Electrophysiological analysis using a pH microelectrode showed that these TrAqps increase B(OH)3 permeability. These results indicate that TrAqp3a, 7, 8bb, 9a, and 9b act as boric acid transport systems, likely as channels, in marine teleosts.
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Affiliation(s)
- Shiori Kumagai
- School of Life Science and TechnologyTokyo Institute of TechnologyYokohamaJapan
| | - Erika Watanabe
- School of Life Science and TechnologyTokyo Institute of TechnologyYokohamaJapan
| | - Naoko Hayashi
- Graduate School of Bioscience and BiotechnologyTokyo Institute of TechnologyYokohamaJapan
| | - Yuuri Kimura
- Graduate School of Bioscience and BiotechnologyTokyo Institute of TechnologyYokohamaJapan
| | - Takehiro Kamiya
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life SciencesThe University of TokyoTokyoJapan
| | - Ayumi Nagashima
- School of Life Science and TechnologyTokyo Institute of TechnologyYokohamaJapan
| | - Kazutaka Ushio
- School of Life Science and TechnologyTokyo Institute of TechnologyYokohamaJapan
| | - Genki Imaizumi
- School of Life Science and TechnologyTokyo Institute of TechnologyYokohamaJapan
| | - Juhyun Kim
- School of Life Science and TechnologyTokyo Institute of TechnologyYokohamaJapan
| | - Keijiro Munakata
- School of Life Science and TechnologyTokyo Institute of TechnologyYokohamaJapan
- Graduate School of Bioscience and BiotechnologyTokyo Institute of TechnologyYokohamaJapan
| | - Takahiro Umezawa
- Graduate School of Bioscience and BiotechnologyTokyo Institute of TechnologyYokohamaJapan
| | - Shigehisa Hirose
- Graduate School of Bioscience and BiotechnologyTokyo Institute of TechnologyYokohamaJapan
| | - Koji Kasai
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life SciencesThe University of TokyoTokyoJapan
| | - Toru Fujiwara
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life SciencesThe University of TokyoTokyoJapan
| | - Michael F. Romero
- Department of Physiology and Biomedical EngineeringMayo Clinic College of MedicineRochesterMinnesotaUnited States
- Nephrology & HypertensionMayo Clinic College of MedicineRochesterMinnesotaUnited States
- O'Brien Urology Research CenterMayo Clinic College of MedicineRochesterMinnesotaUnited States
| | - Akira Kato
- School of Life Science and TechnologyTokyo Institute of TechnologyYokohamaJapan
- Graduate School of Bioscience and BiotechnologyTokyo Institute of TechnologyYokohamaJapan
- Department of Physiology and Biomedical EngineeringMayo Clinic College of MedicineRochesterMinnesotaUnited States
- Center for Biological Resources and InformaticsTokyo Institute of TechnologyYokohamaJapan
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9
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Shikanai Y, Takahashi S, Enomoto Y, Yamagami M, Yamaguchi K, Shigenobu S, Kamiya T, Fujiwara T. Arabidopsis Glucan Synthase-Like1 (GSL1) Is Required for Tolerance to Low-Calcium Conditions and Exhibits a Function Comparable to GSL10. Plant Cell Physiol 2022; 63:1474-1484. [PMID: 35876020 DOI: 10.1093/pcp/pcac106] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 06/16/2022] [Accepted: 07/24/2022] [Indexed: 06/15/2023]
Abstract
Crops that exhibit symptoms of calcium (Ca) deficiency constitute a major agricultural problem. Molecular breeding of resistant cultivars is a promising method for overcoming this problem. However, the involved genes must first be identified. Here, we show that the glucan synthase-like (GSL) 1 gene is essential for low-Ca tolerance in Arabidopsis thaliana. GSL1 is homologous to GSL10, which we previously showed was essential for low-Ca tolerance. Under low-Ca conditions, gsl1 mutants exhibit reduced growth and the onset of necrosis in new leaves. These symptoms are typical of Ca-deficient crops. A grafting experiment suggested that the shoot genotype, but not the root genotype, was important for the suppression of shoot necrosis. The ectopic accumulation of callose under low-Ca conditions was significantly reduced in gsl1 mutants compared with wild-type plants. Because the corresponding single-mutant phenotypes are similar, we investigated the interaction between GSL1 and GSL10 by testing the gsl1 gsl10 double mutant for sensitivity to low-Ca conditions. The double mutant exhibited a more severe phenotype than did the single mutants, indicating that the effects of GSL1 and GSL10 on low-Ca tolerance are additive. Because GSL genes are highly conserved within the plant kingdom, the GSL loci may be useful for breeding low-Ca tolerant crops.
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Affiliation(s)
- Yusuke Shikanai
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 113-8657 Japan
| | - Satomi Takahashi
- Faculty of Agriculture, The University of Tokyo, Tokyo, 113-8657 Japan
| | - Yusuke Enomoto
- Department of Radioecology, Institute of Environmental Sciences, Aomori, 039-3212 Japan
- Showa Gakuin Junior & Senior High School, Higashisugano, Ichikawa, Chiba, 272-0823 Japan
| | - Mutsumi Yamagami
- Department of Radioecology, Institute of Environmental Sciences, Aomori, 039-3212 Japan
| | - Katsushi Yamaguchi
- NIBB Core Research Facilities, National Institute for Basic Biology, Aichi, 444-8585 Japan
| | - Shuji Shigenobu
- NIBB Core Research Facilities, National Institute for Basic Biology, Aichi, 444-8585 Japan
| | - Takehiro Kamiya
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 113-8657 Japan
| | - Toru Fujiwara
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 113-8657 Japan
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10
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Shikanai Y, Asada M, Sato T, Enomoto Y, Yamagami M, Yamaguchi K, Shigenobu S, Kamiya T, Fujiwara T. Role of GSL8 in low calcium tolerance in Arabidopsis thaliana. Plant Biotechnol (Tokyo) 2022; 39:221-227. [PMID: 36349239 PMCID: PMC9592936 DOI: 10.5511/plantbiotechnology.22.0421a] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 04/21/2022] [Indexed: 06/16/2023]
Abstract
Calcium (Ca) deficiency affects the yields and quality of agricultural products. Susceptibility to Ca deficiency varies among crops and cultivars; however, its genetic basis remains largely unknown. Genes required for low Ca tolerance in Arabidopsis thaliana have been identified. In this study, we identified a novel gene required for low Ca tolerance in A. thaliana. We isolated a mutant sensitive to low Ca concentrations and identified Glucan synthase-like (GSL) 8 as a gene responsible for low Ca tolerance. GSL8 is a paralog of the previously identified low Ca tolerance gene GSL10, which encodes β-1,3 glucan(callose) synthase. Under low Ca conditions, the shoot growth of gsl8 mutants were inhibited compared to wild-type plants. A grafting experiment indicated that the shoot, but not root, genotype was important for the shoot growth phenotype. The ectopic accumulation of callose under low Ca conditions was reduced in gsl8 mutants. We further investigated the interaction between GSL8 and GSL10 by testing the gsl8 gsl10 double mutant for sensitivity to low Ca concentrations. The double mutant exhibited a more severe phenotype than the single mutant under 0.3 mM Ca, indicating additive effects of GSL8 and GSL10 with respect to low Ca tolerance. These results establish that GSL genes are required for low Ca tolerance in A. thaliana.
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Affiliation(s)
- Yusuke Shikanai
- Graduate School of Agricultural and Life Sciences, the University of Tokyo, Tokyo 113-8657, Japan
| | - Mayu Asada
- Graduate School of Agricultural and Life Sciences, the University of Tokyo, Tokyo 113-8657, Japan
| | - Takafumi Sato
- Graduate School of Agricultural and Life Sciences, the University of Tokyo, Tokyo 113-8657, Japan
| | - Yusuke Enomoto
- Graduate School of Agricultural and Life Sciences, the University of Tokyo, Tokyo 113-8657, Japan
| | - Mutsumi Yamagami
- Department of Radioecology, Institute of Environmental Sciences, Aomori 039-3212, Japan
| | - Katsushi Yamaguchi
- NIBB Core Research Facilities, National Institute for Basic Biology, Aichi 444-8585, Japan
| | - Shuji Shigenobu
- NIBB Core Research Facilities, National Institute for Basic Biology, Aichi 444-8585, Japan
| | - Takehiro Kamiya
- Graduate School of Agricultural and Life Sciences, the University of Tokyo, Tokyo 113-8657, Japan
| | - Toru Fujiwara
- Graduate School of Agricultural and Life Sciences, the University of Tokyo, Tokyo 113-8657, Japan
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11
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Kan M, Fujiwara T, Kamiya T. Golgi-Localized OsFPN1 is Involved in Co and Ni Transport and Their Detoxification in Rice. Rice (N Y) 2022; 15:36. [PMID: 35817888 PMCID: PMC9273799 DOI: 10.1186/s12284-022-00583-3] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 07/04/2022] [Indexed: 05/13/2023]
Abstract
Cobalt (Co) and nickel (Ni) are beneficial and essential elements for plants, respectively, with the latter required for urease activity, which hydrolyzes urea into ammonium in plants. However, excess Co and Ni are toxic to plants and their transport mechanisms in rice are unclear. Here, we analyzed an ethyl methanesulfonate (EMS)-mutagenized rice mutant, 1187_n, with increased Co and Ni contents in its brown rice and shoots. 1187_n has a mutation in OsFPN1, which was correlated with a high Co and Ni phenotype in F2 crosses between the parental line and mutant. In addition, CRISPR/Cas9 mutants exhibited a phenotype similar to that of 1187_n, demonstrating that OsFPN1 is the causal gene of the mutant. In addition to the high Co and Ni in brown rice and shoots, the mutant also exhibited high Co and Ni concentrations in the xylem sap, but low concentrations in the roots, suggesting that OsFPN1 is involved in the root-to-shoot translocation of Co and Ni. The growth of 1187_n and CRISPR/Cas9 lines were suppressed under high Co and Ni condition, indicating OsFPN1 is required for the normal growth under high Co and Ni. An OsFPN1-green fluorescent protein (GFP) fusion protein was localized to the Golgi apparatus. Yeast carrying GFP-OsFPN1 increased sensitivity to high Co contents and decreased Co and Ni accumulation. These results suggest that OsFPN1 can transport Co and Ni and is vital detoxification in rice.
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Affiliation(s)
- Manman Kan
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Toru Fujiwara
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Takehiro Kamiya
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan.
- Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama, 332-0012, Japan.
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12
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Monden K, Kamiya T, Sugiura D, Suzuki T, Nakagawa T, Hachiya T. Root-specific activation of plasma membrane H +-ATPase 1 enhances plant growth and shoot accumulation of nutrient elements under nutrient-poor conditions in Arabidopsis thaliana. Biochem Biophys Res Commun 2022; 621:39-45. [PMID: 35810589 DOI: 10.1016/j.bbrc.2022.06.097] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Accepted: 06/29/2022] [Indexed: 11/02/2022]
Abstract
Plasma membrane (PM) H+-ATPase contributes to nutrient uptake and stomatal opening by creating proton gradient across the membrane. Previous studies report that a dominant mutation in the OPEN STOMATA2 locus (OST2-2D) constitutively activates Arabidopsis PM H+-ATPase 1 (AHA1), which enlarges proton motive force for root nutrient uptake. However, the stomatal opening is also constitutively enhanced in the ost2-2D, causing drought hypersensitivity. To develop plants with improved nutrient acquisition and normal stomatal movement, we generated grafted plants (scion/rootstock: Col-0 (WT)/ost2-2D), and compared their growth, nutrient element content, and transcriptomes with those of control plants (WT/WT) under nutrient-rich or nutrient-poor conditions. WT/ost2-2D shoots had larger weights, rosette diameter, leaf blade area, and content of C, N, K, Ca, S, P, Mg, Na, Mn, B, Co, and Mo under nutrient-poor conditions compared with WT/WT shoots. The root weights and primary root length were greater in WT/ost2-2D plants than in WT/WT plants under both nutrient conditions. Root expression of the high-affinity nitrate transporter NRT2.1, potassium transporter HAK5, and divalent cation transporter IRT1 was higher in WT/ost2-2D plants than in WT/WT plants under nutrient-poor conditions. These results suggest that root-specific activation of PM H+-ATPase enhances plant growth by increasing root uptake of nutrient elements under nutrient-poor conditions. Our study presents a novel approach to improving nutrient uptake efficiency in crops for low-input sustainable agriculture.
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Affiliation(s)
- Kota Monden
- Department of Molecular and Functional Genomics, Interdisciplinary Center for Science Research, Shimane University, Matsue, 690-8504, Japan
| | - Takehiro Kamiya
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 113-8657, Japan
| | - Daisuke Sugiura
- Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, 464-8601, Japan
| | - Takamasa Suzuki
- College of Bioscience and Biotechnology, Chubu University, Kasugai, 487-8501, Japan
| | - Tsuyoshi Nakagawa
- Department of Molecular and Functional Genomics, Interdisciplinary Center for Science Research, Shimane University, Matsue, 690-8504, Japan
| | - Takushi Hachiya
- Department of Molecular and Functional Genomics, Interdisciplinary Center for Science Research, Shimane University, Matsue, 690-8504, Japan.
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13
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Kandwal P, Fujiwara T, Kamiya T. OsVIT2 Mutation Increases Fe and Zn of Grain Without Compromising the Growth in Paddy Field. Front Plant Sci 2022; 13:868661. [PMID: 35812939 PMCID: PMC9257253 DOI: 10.3389/fpls.2022.868661] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Accepted: 05/24/2022] [Indexed: 06/15/2023]
Abstract
Nearly 2 billion people who reside in developing countries are suffering from nutrient deficiency, also known as hidden hunger. A hidden hunger includes iron (Fe) and zinc (Zn) deficiency. One of the most efficient solutions to hidden hunger is the biofortification of crops through breeding. In this study, we characterized the mutant 1095_k, which has high grain Fe (~1.4-fold) and Zn (~1.2-fold) concentration compared with wild-type plants for a 5-year field trial. The yield components of 1095_k are similar to wild-type plants in a paddy field. In addition, 1095_k has a non-sense mutation in OsVIT2, a vacuolar localized Fe transporter. F2 crosses between 1095_k and wild type having the mutation showing higher grain Fe and Zn concentration. In contrast, plants without the mutation showed similar element concentrations as the wild type. These results suggest that OsVIT2 would be responsible for high Fe and Zn of grain and the 1095_k would be a useful breeding material for the biofortification of Fe and Zn.
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14
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Tabata R, Kamiya T, Imoto S, Tamura H, Ikuta K, Tabata M, Hirayama T, Tsukagoshi H, Tanoi K, Suzuki T, Hachiya T, Sakakibara H. Systemic Regulation of Iron Acquisition by Arabidopsis in Environments with Heterogeneous Iron Distributions. Plant Cell Physiol 2022; 63:842-854. [PMID: 35445268 PMCID: PMC9199186 DOI: 10.1093/pcp/pcac049] [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] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 04/10/2022] [Accepted: 04/20/2022] [Indexed: 05/26/2023]
Abstract
Nutrient distribution within the soil is generally heterogeneous. Plants, therefore, have evolved sophisticated systemic processes enabling them to optimize their nutrient acquisition efficiency. By organ-to-organ communication in Arabidopsis thaliana, for instance, iron (Fe) starvation in one part of a root drives the upregulation of a high-affinity Fe-uptake system in other root regions surrounded by sufficient levels of Fe. This compensatory response through Fe-starvation-triggered organ-to-organ communication includes the upregulation of Iron-regulated transporter 1 (IRT1) gene expression on the Fe-sufficient side of the root; however, the molecular basis underlying this long-distance signaling remains unclear. Here, we analyzed gene expression by RNA-seq analysis of Fe-starved split-root cultures. Genome-wide expression analysis showed that localized Fe depletion in roots upregulated several genes involved in Fe uptake and signaling, such as IRT1, in a distant part of the root exposed to Fe-sufficient conditions. This result indicates that long-distance signaling for Fe demand alters the expression of a subset of genes responsible for Fe uptake and coumarin biosynthesis to maintain a level of Fe acquisition sufficient for the entire plant. Loss of IRON MAN/FE-UPTAKE-INDUCING PEPTIDE (IMA/FEP) leads to the disruption of compensatory upregulation of IRT1 in the root surrounded by sufficient Fe. In addition, our split-root culture-based analysis provides evidence that the IMA3/FEP1-MYB10/72 pathway mediates long-distance signaling in Fe homeostasis through the regulation of coumarin biosynthesis. These data suggest that the signaling of IMA/FEP, a ubiquitous family of metal-binding peptides, is critical for organ-to-organ communication in response to Fe starvation under heterogeneous Fe conditions in the surrounding environment.
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Affiliation(s)
| | - Takehiro Kamiya
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, 113-8657 Japan
| | - Shunpei Imoto
- Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601 Japan
| | - Hana Tamura
- Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601 Japan
| | - Kumiko Ikuta
- Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601 Japan
| | - Michika Tabata
- Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601 Japan
| | - Tasuku Hirayama
- Laboratory of Pharmaceutical and Medicinal Chemistry, Gifu Pharmaceutical University, 1-25-4, Daigaku-nishi, Gifu, 501-1196 Japan
| | - Hironaka Tsukagoshi
- Faculty of Agriculture, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya, 468-8502 Japan
| | - Keitaro Tanoi
- Isotope Facility for Agricultural Education and Research, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, 113-8657 Japan
| | - Takamasa Suzuki
- Department of Biological Chemistry, College of Bioscience and Biotechnology, Chubu University, 1200 Matsumoto-cho, Kasugai, Aichi, 478-8501 Japan
| | - Takushi Hachiya
- Department of Molecular and Function Genomics, Interdisciplinary Center for Science Research, Shimane University, 1060 Nishikawatsu-cho, Matsue, 690-8504 Japan
| | - Hitoshi Sakakibara
- Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601 Japan
- Center for Sustainable Resource Science, RIKEN, 1-7-22, Suehiro, Tsurumi, Yokohama, 230-0045 Japan
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15
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Wahinya FW, Yamazaki K, Jing Z, Takami T, Kamiya T, Kajiya-Kanegae H, Takanashi H, Iwata H, Tsutsumi N, Fujiwara T, Sakamoto W. Sorghum Ionomics Reveals the Functional SbHMA3a Allele that Limits Excess Cadmium Accumulation in Grains. Plant Cell Physiol 2022; 63:713-728. [PMID: 35312772 DOI: 10.1093/pcp/pcac035] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 03/07/2022] [Accepted: 03/21/2022] [Indexed: 06/14/2023]
Abstract
Understanding uptake and redistribution of essential minerals or sequestering of toxic elements is important for optimized crop production. Although the mechanisms controlling mineral transport have been elucidated in rice and other species, little is understood in sorghum-an important C4 cereal crop. Here, we assessed the genetic factors that govern grain ionome profiles in sorghum using recombinant inbred lines (RILs) derived from a cross between BTx623 and NOG (Takakibi). Pairwise correlation and clustering analysis of 22 elements, measured in sorghum grains harvested under greenhouse conditions, indicated that the parental lines, as well as the RILs, show different ionomes. In particular, BTx623 accumulated significantly higher levels of cadmium (Cd) than NOG, because of differential root-to-shoot translocation factors between the two lines. Quantitative trait locus (QTL) analysis revealed a prominent QTL for grain Cd concentration on chromosome 2. Detailed analysis identified SbHMA3a, encoding a P1B-type ATPase heavy metal transporter, as responsible for low Cd accumulation in grains; the NOG allele encoded a functional HMA3 transporter (SbHMA3a-NOG) whose Cd-transporting activity was confirmed by heterologous expression in yeast. BTx623 possessed a truncated, loss-of-function SbHMA3a allele. The functionality of SbHMA3a in NOG was confirmed by Cd concentrations of F2 grains derived from the reciprocal cross, in which the NOG allele behaved in a dominant manner. We concluded that SbHMA3a-NOG is a Cd transporter that sequesters excess Cd in root tissues, as shown in other HMA3s. Our findings will facilitate the isolation of breeding cultivars with low Cd in grains or in exploiting high-Cd cultivars for phytoremediation.
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Affiliation(s)
- Fiona Wacera Wahinya
- Institute of Plant Science and Resources, Okayama University, 2-20-1 Chuo, Kurashiki, Okayama, 710-0046 Japan
| | - Kiyoshi Yamazaki
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657 Japan
| | - Zihuan Jing
- Institute of Plant Science and Resources, Okayama University, 2-20-1 Chuo, Kurashiki, Okayama, 710-0046 Japan
| | - Tsuneaki Takami
- Institute of Plant Science and Resources, Okayama University, 2-20-1 Chuo, Kurashiki, Okayama, 710-0046 Japan
| | - Takehiro Kamiya
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657 Japan
| | - Hiromi Kajiya-Kanegae
- Research Center for Agricultural Information Technology, National Agriculture and Food Research Organization, 2-14-1 Nishi-shimbashi, Minato-ku, Tokyo, 105-0003 Japan
| | - Hideki Takanashi
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657 Japan
| | - Hiroyoshi Iwata
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657 Japan
| | - Nobuhiro Tsutsumi
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657 Japan
| | - Toru Fujiwara
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657 Japan
| | - Wataru Sakamoto
- Institute of Plant Science and Resources, Okayama University, 2-20-1 Chuo, Kurashiki, Okayama, 710-0046 Japan
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16
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Kawai M, Tabata R, Ohashi M, Honda H, Kamiya T, Kojima M, Takebayashi Y, Oishi S, Okamoto S, Hachiya T, Sakakibara H. Regulation of ammonium acquisition and use in Oryza longistaminata ramets under nitrogen source heterogeneity. Plant Physiol 2022; 188:2364-2376. [PMID: 35134987 PMCID: PMC8968255 DOI: 10.1093/plphys/kiac025] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 12/18/2021] [Indexed: 05/31/2023]
Abstract
Oryza longistaminata, a wild rice, vegetatively reproduces and forms a networked clonal colony consisting of ramets connected by rhizomes. Although water, nutrients, and other molecules can be transferred between ramets via the rhizomes, inter-ramet communication in response to spatially heterogeneous nitrogen availability is not well understood. We studied the response of ramet pairs to heterogeneous nitrogen availability using a split hydroponic system that allowed each ramet root to be exposed to different conditions. Ammonium uptake was compensatively enhanced in the sufficient-side root when roots of the ramet pairs were exposed to ammonium-sufficient and ammonium-deficient conditions. Comparative transcriptome analysis revealed that a gene regulatory network for effective ammonium assimilation and amino acid biosynthesis was activated in the sufficient-side roots. Allocation of absorbed nitrogen from the nitrogen-sufficient to the nitrogen-deficient ramets was rather limited. Nitrogen was preferentially used for newly growing axillary buds on the sufficient-side ramets. Biosynthesis of trans-zeatin (tZ), a cytokinin, was upregulated in response to the nitrogen supply, but tZ appeared not to target the compensatory regulation. Our results also implied that the O. longistaminata putative ortholog of rice (Oryza sativa) C-terminally encoded peptide1 plays a role as a nitrogen-deficient signal in inter-ramet communication, providing compensatory upregulation of nitrogen assimilatory genes. These results provide insights into the molecular basis for efficient growth strategies of asexually proliferating plants growing in areas where the distribution of ammonium ions is spatially heterogeneous.
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Affiliation(s)
- Misato Kawai
- Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
| | - Ryo Tabata
- Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
| | - Miwa Ohashi
- Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
| | - Haruno Honda
- Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
| | - Takehiro Kamiya
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo 113-8657, Japan
| | - Mikiko Kojima
- RIKEN Center for Sustainable Resource Science, Tsurumi, Yokohama 230-0045, Japan
| | - Yumiko Takebayashi
- RIKEN Center for Sustainable Resource Science, Tsurumi, Yokohama 230-0045, Japan
| | - Shunsuke Oishi
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Chikusa, Nagoya464-8602, Japan
| | - Satoru Okamoto
- Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
- Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
| | - Takushi Hachiya
- Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
- Department of Molecular and Function Genomics, Interdisciplinary Center for Science Research, Shimane University, Matsue 690-8504, Japan
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17
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Wang M, Hasegawa T, Beier M, Hayashi M, Ohmori Y, Yano K, Teramoto S, Kamiya T, Fujiwara T. Erratum To: Growth and Nitrate Reductase Activity are Impaired in Rice Osnlp4 Mutants Supplied with Nitrate. Plant Cell Physiol 2022; 63:148. [PMID: 34695215 DOI: 10.1093/pcp/pcab136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
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18
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Kolbeck A, Marhavý P, De Bellis D, Li B, Kamiya T, Fujiwara T, Kalmbach L, Geldner N. CASP microdomain formation requires cross cell wall stabilization of domains and non-cell autonomous action of LOTR1. eLife 2022; 11:69602. [PMID: 35029147 PMCID: PMC8794472 DOI: 10.7554/elife.69602] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [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] [Received: 04/20/2021] [Accepted: 01/13/2022] [Indexed: 11/24/2022] Open
Abstract
Efficient uptake of nutrients in both animal and plant cells requires tissue-spanning diffusion barriers separating inner tissues from the outer lumen/soil. However, we poorly understand how such contiguous three-dimensional superstructures are formed in plants. Here, we show that correct establishment of the plant Casparian Strip (CS) network relies on local neighbor communication. We show that positioning of Casparian Strip membrane domains (CSDs) is tightly coordinated between neighbors in wild-type and that restriction of domain formation involves the putative extracellular protease LOTR1. Impaired domain restriction in lotr1 leads to fully functional CSDs at ectopic positions, forming ‘half strips’. LOTR1 action in the endodermis requires its expression in the stele. LOTR1 endodermal expression cannot complement, while cortex expression causes a dominant-negative phenotype. Our findings establish LOTR1 as a crucial player in CSD positioning acting in a directional, non-cell-autonomous manner to restrict and coordinate CS positioning.
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Affiliation(s)
- Andreas Kolbeck
- Department of Plant Molecular Biology, University of Lausanne, Lausanne, Switzerland
| | - Peter Marhavý
- Department of Plant Molecular Biology, University of Lausanne, Lausanne, Switzerland
| | - Damien De Bellis
- Department of Plant Molecular Biology, University of Lausanne, Lausanne, Switzerland
| | - Baohai Li
- Department of Applied Biological Chemistry, University of Tokyo, Tokyo, Japan
| | - Takehiro Kamiya
- Department of Applied Biological Chemistry, University of Tokyo, Tokyo, Japan
| | - Toru Fujiwara
- Department of Applied Biological Chemistry, University of Tokyo, Tokyo, Japan
| | - Lothar Kalmbach
- Department of Plant Molecular Biology, University of Lausanne, Lausanne, Switzerland
| | - Niko Geldner
- Department of Plant Molecular Biology, University of Lausanne, Lausanne, Switzerland
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19
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Ushio K, Watanabe E, Kamiya T, Nagashima A, Furuta T, Imaizumi G, Fujiwara T, Romero MF, Kato A. Boric acid transport activity of human aquaporins expressed in Xenopus oocytes. Physiol Rep 2022; 10:e15164. [PMID: 35014212 PMCID: PMC8749175 DOI: 10.14814/phy2.15164] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 12/16/2021] [Accepted: 12/17/2021] [Indexed: 04/17/2023] Open
Abstract
Boric acid is a vital micronutrient that is toxic at high concentrations in animals. However, the mechanisms underlying boric acid transport in animal cells remain unclear. To identify the plasma membrane boric acid channels in animals, we analyzed the function of human aquaporins (AQPs), which are homologous to the nodulin-like intrinsic protein family of plant boric acid channels. When human AQPs were expressed in Xenopus laevis oocytes, the results of the swelling assay showed that boric acid permeability significantly increased in oocytes expressing AQP3, 7, 8, 9, and 10, but not in those expressing AQP1, 2, 4, and 5. The boric acid influxes of these oocytes were also confirmed by elemental quantification. Electrophysiological analysis using a pH microelectrode showed that these AQPs transported boric acid (B(OH)3 ) but not borate ions (B(OH)4- ). These results indicate that AQP3, 7, 8, 9, and 10 act as boric acid transport systems, likely as channels in humans.
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Affiliation(s)
- Kazutaka Ushio
- School of Life Science and TechnologyTokyo Institute of TechnologyYokohamaJapan
| | - Erika Watanabe
- School of Life Science and TechnologyTokyo Institute of TechnologyYokohamaJapan
| | - Takehiro Kamiya
- Department of Applied Biological ChemistryGraduate School of Agricultural and Life SciencesThe University of TokyoTokyoJapan
| | - Ayumi Nagashima
- School of Life Science and TechnologyTokyo Institute of TechnologyYokohamaJapan
| | - Tadaomi Furuta
- School of Life Science and TechnologyTokyo Institute of TechnologyYokohamaJapan
| | - Genki Imaizumi
- School of Life Science and TechnologyTokyo Institute of TechnologyYokohamaJapan
| | - Toru Fujiwara
- Department of Applied Biological ChemistryGraduate School of Agricultural and Life SciencesThe University of TokyoTokyoJapan
| | - Michael F. Romero
- Department of Physiology and Biomedical EngineeringMayo Clinic College of Medicine & ScienceRochesterMinnesotaUSA
- Nephrology and HypertensionMayo Clinic College of Medicine & ScienceRochesterMinnesotaUSA
- O’Brien Urology Research CenterMayo Clinic College of Medicine & ScienceRochesterMinnesotaUSA
| | - Akira Kato
- School of Life Science and TechnologyTokyo Institute of TechnologyYokohamaJapan
- Department of Physiology and Biomedical EngineeringMayo Clinic College of Medicine & ScienceRochesterMinnesotaUSA
- Center for Biological Resources and InformaticsTokyo Institute of TechnologyYokohamaJapan
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20
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Lu P, Sui M, Zhang M, Wang M, Kamiya T, Okamoto K, Itoh H, Okuda S, Suzuki M, Asakura T, Fujiwara T, Nagata K. Rosmarinic Acid and Sodium Citrate Have a Synergistic Bacteriostatic Effect against Vibrio Species by Inhibiting Iron Uptake. Int J Mol Sci 2021; 22:13010. [PMID: 34884815 PMCID: PMC8657459 DOI: 10.3390/ijms222313010] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 11/05/2021] [Revised: 11/26/2021] [Accepted: 11/29/2021] [Indexed: 01/02/2023] Open
Abstract
BACKGROUND New strategies are needed to combat multidrug-resistant bacteria. The restriction of iron uptake by bacteria is a promising way to inhibit their growth. We aimed to suppress the growth of Vibrio bacterial species by inhibiting their ferric ion-binding protein (FbpA) using food components. METHODS Twenty spices were selected for the screening of FbpA inhibitors. The candidate was applied to antibacterial tests, and the mechanism was further studied. RESULTS An active compound, rosmarinic acid (RA), was screened out. RA binds competitively and more tightly than Fe3+ to VmFbpA, the FbpA from V. metschnikovii, with apparent KD values of 8 μM vs. 17 μM. Moreover, RA can inhibit the growth of V. metschnikovii to one-third of the control at 1000 μM. Interestingly, sodium citrate (SC) enhances the growth inhibition effect of RA, although SC only does not inhibit the growth. The combination of RA/SC completely inhibits the growth of not only V. metschnikovii at 100/100 μM but also the vibriosis-causative pathogens V. vulnificus and V. parahaemolyticus, at 100/100 and 1000/100 μM, respectively. However, RA/SC does not affect the growth of Escherichia coli. CONCLUSIONS RA/SC is a potential bacteriostatic agent against Vibrio species while causing little damage to indigenous gastrointestinal bacteria.
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Affiliation(s)
- Peng Lu
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan; (M.S.); (M.Z.); (M.W.); (T.K.); (K.O.); (H.I.); (S.O.); (M.S.); (T.A.); (T.F.)
| | - Miaomiao Sui
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan; (M.S.); (M.Z.); (M.W.); (T.K.); (K.O.); (H.I.); (S.O.); (M.S.); (T.A.); (T.F.)
| | - Mimin Zhang
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan; (M.S.); (M.Z.); (M.W.); (T.K.); (K.O.); (H.I.); (S.O.); (M.S.); (T.A.); (T.F.)
| | - Mengyao Wang
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan; (M.S.); (M.Z.); (M.W.); (T.K.); (K.O.); (H.I.); (S.O.); (M.S.); (T.A.); (T.F.)
| | - Takehiro Kamiya
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan; (M.S.); (M.Z.); (M.W.); (T.K.); (K.O.); (H.I.); (S.O.); (M.S.); (T.A.); (T.F.)
| | - Ken Okamoto
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan; (M.S.); (M.Z.); (M.W.); (T.K.); (K.O.); (H.I.); (S.O.); (M.S.); (T.A.); (T.F.)
| | - Hideaki Itoh
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan; (M.S.); (M.Z.); (M.W.); (T.K.); (K.O.); (H.I.); (S.O.); (M.S.); (T.A.); (T.F.)
| | - Suguru Okuda
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan; (M.S.); (M.Z.); (M.W.); (T.K.); (K.O.); (H.I.); (S.O.); (M.S.); (T.A.); (T.F.)
| | - Michio Suzuki
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan; (M.S.); (M.Z.); (M.W.); (T.K.); (K.O.); (H.I.); (S.O.); (M.S.); (T.A.); (T.F.)
| | - Tomiko Asakura
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan; (M.S.); (M.Z.); (M.W.); (T.K.); (K.O.); (H.I.); (S.O.); (M.S.); (T.A.); (T.F.)
| | - Toru Fujiwara
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan; (M.S.); (M.Z.); (M.W.); (T.K.); (K.O.); (H.I.); (S.O.); (M.S.); (T.A.); (T.F.)
| | - Koji Nagata
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan; (M.S.); (M.Z.); (M.W.); (T.K.); (K.O.); (H.I.); (S.O.); (M.S.); (T.A.); (T.F.)
- Agricultural Bioinformatics Research Unit, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
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21
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Wang M, Hasegawa T, Beier M, Hayashi M, Ohmori Y, Yano K, Teramoto S, Kamiya T, Fujiwara T. Growth and Nitrate Reductase Activity Are Impaired in Rice Osnlp4 Mutants Supplied with Nitrate. Plant Cell Physiol 2021; 62:1156-1167. [PMID: 33693871 DOI: 10.1093/pcp/pcab035] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [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: 08/30/2020] [Accepted: 02/27/2021] [Indexed: 05/24/2023]
Abstract
Nitrate is an important nutrient and signaling molecule in plants, which modulates the expression of many genes and regulates plant growth. In paddy-grown rice (Oryza sativa), nitrogen is mostly supplied in the form of ammonium but can also be supplied in the form of nitrate. Several nitrogen transporters and nitrate assimilation enzymes have been identified and functionally characterized in rice. However, little is known regarding the nitrate sensing system in rice, and the regulatory mechanisms of nitrate-related genes remain to be elucidated. In recent years, NIN-like proteins (NLPs) have been described as key transcription factors of nitrogen responses in Arabidopsis thaliana, which implies that OsNLP4 is involved in the regulation of nitrate assimilation and nitrogen use efficiency in rice. Here, we show that OsNLP4 can influence plant growth by affecting nitrate reductase (NR) activity. The growth of OsNLP4 knockdown mutants was reduced when nitrate was supplied, but not when ammonium was supplied. The nitrate concentration was significantly reduced in osnlp4 mutants. Furthermore, the concentrations of iron and molybdenum, essential elements for NR activity, were reduced in OsNLP4 knockdown mutants. We propose that, in addition to the regulation of gene expression within the nitrate signaling pathway, OsNLP4 can affect the NR activity and nitrate-dependent growth of rice. Our results support a working model for the role of OsNLP4 in the nitrate signaling pathway.
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Affiliation(s)
- Mengyao Wang
- The Laboratory of Plant Nutrition and Fertilizers, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 1138657 Japan
| | - Takahiro Hasegawa
- The Laboratory of Plant Nutrition and Fertilizers, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 1138657 Japan
| | - Marcel Beier
- The Laboratory of Plant Nutrition and Fertilizers, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 1138657 Japan
| | - Makoto Hayashi
- RIKEN Center for Sustainable Resource Science, Kanagawa, 2300045 Japan
| | - Yoshihiro Ohmori
- The Laboratory of Plant Nutrition and Fertilizers, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 1138657 Japan
| | - Kenji Yano
- The Laboratory of Plant Nutrition and Fertilizers, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 1138657 Japan
| | - Shota Teramoto
- The Laboratory of Plant Nutrition and Fertilizers, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 1138657 Japan
| | - Takehiro Kamiya
- The Laboratory of Plant Nutrition and Fertilizers, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 1138657 Japan
| | - Toru Fujiwara
- The Laboratory of Plant Nutrition and Fertilizers, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 1138657 Japan
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22
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Ishikawa S, Hayashi S, Tanikawa H, Iino M, Abe T, Kuramata M, Feng Z, Fujiwara T, Kamiya T. Tonoplast-Localized OsMOT1;2 Participates in Interorgan Molybdate Distribution in Rice. Plant Cell Physiol 2021; 62:913-921. [PMID: 33826734 DOI: 10.1093/pcp/pcab050] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Revised: 03/18/2021] [Accepted: 04/06/2021] [Indexed: 06/12/2023]
Abstract
Molybdenum (Mo) is an essential element for plant growth and is utilized by several key enzymes in biological redox processes. Rice assimilates molybdate ions via OsMOT1;1, a transporter with a high affinity for molybdate. However, other systems involved in the molecular transport of molybdate in rice remain unclear. Here, we characterized OsMOT1;2, which shares amino acid sequence similarity with AtMOT1;2 and functions in vacuolar molybdate export. We isolated a rice mutant harboring a complete deletion of OsMOT1;2. This mutant exhibited a significantly lower grain Mo concentration than the wild type (WT), but its growth was not inhibited. The Mo concentration in grains was restored by the introduction of WT OsMOT1;2. The OsMOT1;2-GFP protein was localized to the vacuolar membrane when transiently expressed in rice protoplasts. At the reproductive growth stage of the WT plant, OsMOT1;2 was highly expressed in the 2nd and lower leaf blades and nodes. The deletion of OsMOT1;2 impaired interorgan Mo allocation in aerial parts: relative to the WT, the mutant exhibited decreased Mo levels in the 1st and 2nd leaf blades and grains but increased Mo levels in the 2nd and lower leaf sheaths, nodes and internodes. When the seedlings were exposed to a solution with a high KNO3 concentration in the absence of Mo, the mutant exhibited significantly lower nitrate reductase activity in the shoots than the WT. Our results suggest that OsMOT1;2 plays an essential role in interorgan Mo distribution and molybdoenzyme activity in rice.
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Affiliation(s)
- Satoru Ishikawa
- Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, 305-8604 Japan
| | - Shimpei Hayashi
- Institute of Agrobiological Sciences, NARO, Tsukuba, 305-8604 Japan
| | - Hachidai Tanikawa
- Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, 305-8604 Japan
| | - Manaka Iino
- Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, 305-8604 Japan
| | - Tadashi Abe
- Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, 305-8604 Japan
| | - Masato Kuramata
- Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, 305-8604 Japan
| | - Zhihang Feng
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657 Japan
| | - Toru Fujiwara
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657 Japan
| | - Takehiro Kamiya
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657 Japan
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23
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Wait LF, Kamiya T, Fairlie-Clarke KJ, Metcalf CJE, Graham AL, Mideo N. Differential drivers of intraspecific and interspecific competition during malaria-helminth co-infection. Parasitology 2021; 148:1030-1039. [PMID: 33971991 PMCID: PMC11010048 DOI: 10.1017/s003118202100072x] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 04/14/2021] [Accepted: 05/04/2021] [Indexed: 11/05/2022]
Abstract
Various host and parasite factors interact to determine the outcome of infection. We investigated the effects of two factors on the within-host dynamics of malaria in mice: initial infectious dose and co-infection with a helminth that limits the availability of red blood cells (RBCs). Using a statistical, time-series approach to model the within-host ‘epidemiology’ of malaria, we found that increasing initial dose reduced the time to peak cell-to-cell parasite propagation, but also reduced its magnitude, while helminth co-infection delayed peak cell-to-cell propagation, except at the highest malaria doses. Using a mechanistic model of within-host infection dynamics, we identified dose-dependence in parameters describing host responses to malaria infection and uncovered a plausible explanation of the observed differences in single vs co-infections. Specifically, in co-infections, our model predicted a higher background death rate of RBCs. However, at the highest dose, when intraspecific competition between malaria parasites would be highest, these effects of co-infection were not observed. Such interactions between initial dose and co-infection, although difficult to predict a priori, are key to understanding variation in the severity of disease experienced by hosts and could inform studies of malaria transmission dynamics in nature, where co-infection and low doses are the norm.
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Affiliation(s)
- L. F. Wait
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey, USA
| | - T. Kamiya
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, Canada
| | | | - C. J. E. Metcalf
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey, USA
| | - A. L. Graham
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey, USA
| | - N. Mideo
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, Canada
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24
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Durr J, Reyt G, Spaepen S, Hilton S, Meehan C, Qi W, Kamiya T, Flis P, Dickinson HG, Feher A, Shivshankar U, Pavagadhi S, Swarup S, Salt D, Bending GD, Gutierrez-Marcos J. A Novel Signaling Pathway Required for Arabidopsis Endodermal Root Organization Shapes the Rhizosphere Microbiome. Plant Cell Physiol 2021; 62:248-261. [PMID: 33475132 PMCID: PMC8112839 DOI: 10.1093/pcp/pcaa170] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The Casparian strip (CS) constitutes a physical diffusion barrier to water and nutrients in plant roots, which is formed by the polar deposition of lignin polymer in the endodermis tissue. The precise pattern of lignin deposition is determined by the scaffolding activity of membrane-bound Casparian Strip domain proteins (CASPs), but little is known of the mechanism(s) directing this process. Here, we demonstrate that Endodermis-specific Receptor-like Kinase 1 (ERK1) and, to a lesser extent, ROP Binding Kinase1 (RBK1) are also involved in regulating CS formation, with the former playing an essential role in lignin deposition as well as in the localization of CASP1. We show that ERK1 is localized to the cytoplasm and nucleus of the endodermis and that together with the circadian clock regulator, Time for Coffee (TIC), forms part of a novel signaling pathway necessary for correct CS organization and suberization of the endodermis, with their single or combined loss of function resulting in altered root microbiome composition. In addition, we found that other mutants displaying defects in suberin deposition at the CS also display altered root exudates and microbiome composition. Thus, our work reveals a complex network of signaling factors operating within the root endodermis that establish both the CS diffusion barrier and influence the microbial composition of the rhizosphere.
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Affiliation(s)
- Julius Durr
- School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK
| | - Guilhem Reyt
- Division of Plant and Crop Sciences, Future Food Beacon of Excellence & School of Biosciences, University of Nottingham, Nottingham LE12 5RD, UK
| | - Stijn Spaepen
- Department of Plant Microbe Interactions & Cluster of Excellence on Plant Sciences (CEPLAS), Max Planck Institute for Plant Breeding Research, Carl-von-Linn�-Weg 10, K�ln 50829, Germany
- Centre for Microbial and Plant Genetics, Leuven Institute for Beer Research, University of Leuven, Gaston Geenslaan 1 B-3001, Belgium
| | - Sally Hilton
- School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK
| | - Cathal Meehan
- Division of Plant and Crop Sciences, Future Food Beacon of Excellence & School of Biosciences, University of Nottingham, Nottingham LE12 5RD, UK
| | - Wu Qi
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
| | - Takehiro Kamiya
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
| | - Paulina Flis
- Division of Plant and Crop Sciences, Future Food Beacon of Excellence & School of Biosciences, University of Nottingham, Nottingham LE12 5RD, UK
| | - Hugh G Dickinson
- Department of Plant Sciences, University of Oxford, Oxford OX1 3RB, UK
| | - Attila Feher
- Institute of Plant Biology, Biological Research Centre of the Hungarian Academy of Sciences, Temesv�ri krt. 62, Szeged H-6726, Hungary
| | - Umashankar Shivshankar
- Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, 117543, Singapore
| | - Shruti Pavagadhi
- Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, 117543, Singapore
| | - Sanjay Swarup
- Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, 117543, Singapore
| | - David Salt
- Division of Plant and Crop Sciences, Future Food Beacon of Excellence & School of Biosciences, University of Nottingham, Nottingham LE12 5RD, UK
| | - Gary D Bending
- School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK
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25
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Feng Z, Nagao H, Li B, Sotta N, Shikanai Y, Yamaguchi K, Shigenobu S, Kamiya T, Fujiwara T. An SMU Splicing Factor Complex Within Nuclear Speckles Contributes to Magnesium Homeostasis in Arabidopsis. Plant Physiol 2020; 184:428-442. [PMID: 32601148 PMCID: PMC7479882 DOI: 10.1104/pp.20.00109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Accepted: 06/11/2020] [Indexed: 05/06/2023]
Abstract
Mg2+ is among the most abundant divalent cations in living cells. In plants, investigations on magnesium (Mg) homeostasis are restricted to the functional characterization of Mg2+ transporters. Here, we demonstrate that the splicing factors SUPPRESSORS OF MEC-8 AND UNC-52 1 (SMU1) and SMU2 mediate Mg homeostasis in Arabidopsis (Arabidopsis thaliana). A low-Mg sensitive Arabidopsis mutant was isolated, and the causal gene was identified as SMU1 Disruption of SMU2, a protein that can form a complex with SMU1, resulted in a similar low-Mg sensitive phenotype. In both mutants, an Mg2+ transporter gene, Mitochondrial RNA Splicing 2 (MRS2-7), showed altered splicing patterns. Genetic evidence indicated that MRS2-7 functions in the same pathway as SMU1 and SMU2 for low-Mg adaptation. In contrast with previous results showing that the SMU1-SMU2 complex is the active form in RNA splicing, MRS2-7 splicing was promoted in the smu2 mutant overexpressing SMU1, indicating that complex formation is not a prerequisite for the splicing. We found here that formation of the SMU1-SMU2 complex is an essential step for their compartmentation in the nuclear speckles, a type of nuclear body enriched with proteins that participate in various aspects of RNA metabolism. Taken together, our study reveals the involvement of the SMU splicing factors in plant Mg homeostasis and provides evidence that complex formation is required for their intranuclear compartmentation.
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Affiliation(s)
- Zhihang Feng
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
| | - Hiroshi Nagao
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
| | - Baohai Li
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
| | - Naoyuki Sotta
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
| | - Yusuke Shikanai
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
| | | | - Shuji Shigenobu
- National Institute for Basic Biology, Okazaki 444-8585, Japan
| | - Takehiro Kamiya
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
- Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency, Saitama 332-0012, Japan
| | - Toru Fujiwara
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
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Hirano Y, Morisaka A, Kosugiyama H, Inuzuka S, Kamiya T, Mori H, Morishima N, Ishikawa T. FRI0097 EFFECTS OF BIOLOGICAL DISEASE-MODIFYING ANTI-RHEUMATIC DRUG TREATMENT ON PHYSICAL ACTIVITY, MUSCLE POWER, AGILITY AND INHIBITION OF FALL IN PATIENTS WITH RHEUMATOID ARTHRITIS -THE 2-YEAR RESULTS. Ann Rheum Dis 2020. [DOI: 10.1136/annrheumdis-2020-eular.2306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Background:Treatment with biological DMARDs (bDMARDs) rapidly improves signs and symptoms in patients with rheumatoid arthritis (RA). The efficacy of these bDMARDs was evaluated using composite measures or biomarkers used in daily clinical practice or clinical studies. Although a rapid improvement in composite measures or biomarkers is important in the treatment of RA, the primary goal of treatment is improvement of long-term health-related quality of life (HR-QOL) [1]. HR-QOL is evaluated based on physical functions (PF) such as muscle power and agility. We reported the 1-year results of our study presented at EULAR 2019 [2]. The present study was conducted to investigate the 2-year results of our study by including more patents than those included in the previous one.Objectives:This study was aimed at investigating the efficacy of bDMARDs with respect to PF and fall risk in RA patients.Methods:At our institute, in addition to routine rheumatology evaluation, periodic evaluation of physical function is performed by staff members in our rehabilitation center in RA patients in whom the first bDMARD treatment was initiated in Oct. 2015–Feb. 2018. In total, 41 cases were registered in this study. Evaluation of PF included evaluation of muscle power [grasping power (GP) and knee extension power (KEP)]; agility [time up and go test (TUG) and 10-m walking time (10 mW)]; and a questionnaire using modified HAQ, portable fall risk index [3], and the 25-question geriatric locomotive function scale (locomo25) [4] at baseline (BL), which implies the time at the initiation of bDMARD treatment, i.e., 1, 3, 6, 12, and 24 months. Disease activity of RA was evaluated at the same time points. Although 2 years had elapsed from BL in 37 patients, 13 patients dropped out from the evaluation of physical function owing to cessation of bDMARD treatment, rejection of evaluation for physical function, or major joint surgery performed in a patient. The results of 24 patients who completed the evaluation at 24 months were investigated in this study.Results:Baseline characteristics of the 24 patients were as follows: mean age 60.8 years, RA duration 12.3 years, mean SDAI 19.0, and mean CRP level 2.1 mg/dl. The bDMARDs used in the study were abatacept in 7 patients, adalimumab in 4 patients, tocilizumab in 4 patients, golimumab in 4 patients, etanercept in 3 patients, certolizumab in 1 patient, and an infliximab biosimilar in 1 patients. Data are presented as mean values at BL and at 1, 3, 6, 12, and 24 months (Fig.1). SDAI and CRP levels were significantly improved at and after 1 month. GP and KEP were significantly improved at and after 3 and 6 months. TUG and 10 mW results were significantly improved at and after 3 and 6 months. Modified HAQ results were significantly improved at and after 3 months. Locomo25 scores were significantly improved at and after 1 month. Portable fall risk index values were significantly improved at and after 12 months.Conclusion:Although there was a rapid improvement in the signs and symptoms of RA after the initiation of bDMARD treatment, improvement in PF was slightly delayed. Significant improvement of muscle power and agility was achieved after 3–6 months onward. Inhibition of fall risk was achieved at and after 12 months after the initiation of bDMARD treatment. These results suggest that physiotherapy plays a vital role in RA patients who undergo treatment with bDMARDs to gain more rapid improvement of PF.References:[1]Smolen JS et al. Ann Rheum Dis, 2016.[2]Hirano Y et al. Ann Rheum Dis, suppl. 2, 2019.[3]Toba K et al. Jpn J Geriat, 2005.[4]Seichi A at al. J Orthop Sci, 2012.Disclosure of Interests:Yuji Hirano Speakers bureau: Tanabe-Mitsubishi, Pfizer, Eisai, Abbie, Chugai, Bristol-Meyers, Jansen, Astellas, UCB, Eli-Lilly, Asahikasei, Daiichi-Sankyo, Amgen, Ayako Morisaka: None declared, Hironobu Kosugiyama: None declared, Shiori Inuzuka: None declared, Takeshi Kamiya: None declared, Hiroyuki Mori: None declared, Naohito Morishima: None declared, Tomoji Ishikawa: None declared
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27
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Ashraf MA, Umetsu K, Ponomarenko O, Saito M, Aslam M, Antipova O, Dolgova N, Kiani CD, Nehzati S, Tanoi K, Minegishi K, Nagatsu K, Kamiya T, Fujiwara T, Luschnig C, Tanino K, Pickering I, George GN, Rahman A. PIN FORMED 2 Modulates the Transport of Arsenite in Arabidopsis thaliana. Plant Commun 2020; 1:100009. [PMID: 33404549 PMCID: PMC7747963 DOI: 10.1016/j.xplc.2019.100009] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2019] [Revised: 10/15/2019] [Accepted: 11/18/2019] [Indexed: 05/23/2023]
Abstract
Arsenic contamination is a major environmental issue, as it may lead to serious health hazard. The reduced trivalent form of inorganic arsenic, arsenite, is in general more toxic to plants compared with the fully oxidized pentavalent arsenate. The uptake of arsenite in plants has been shown to be mediated through a large subfamily of plant aquaglyceroporins, nodulin 26-like intrinsic proteins (NIPs). However, the efflux mechanisms, as well as the mechanism of arsenite-induced root growth inhibition, remain poorly understood. Using molecular physiology, synchrotron imaging, and root transport assay approaches, we show that the cellular transport of trivalent arsenicals in Arabidopsis thaliana is strongly modulated by PIN FORMED 2 (PIN2) auxin efflux transporter. Root transport assay using radioactive arsenite, X-ray fluorescence imaging (XFI) coupled with X-ray absorption spectroscopy (XAS), and inductively coupled plasma mass spectrometry analysis revealed that pin2 plants accumulate higher concentrations of arsenite in roots compared with the wild-type. At the cellular level, arsenite specifically targets intracellular sorting of PIN2 and thereby alters the cellular auxin homeostasis. Consistently, loss of PIN2 function results in arsenite hypersensitivity in roots. XFI coupled with XAS further revealed that loss of PIN2 function results in specific accumulation of arsenical species, but not the other metals such as iron, zinc, or calcium in the root tip. Collectively, these results suggest that PIN2 likely functions as an arsenite efflux transporter for the distribution of arsenical species in planta.
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Affiliation(s)
- Mohammad Arif Ashraf
- United Graduate School of Agricultural Sciences, Iwate University, Morioka, Iwate, Japan
| | - Kana Umetsu
- Department of Plant Bio Sciences, Faculty of Agriculture, Iwate University, Morioka, Iwate, Japan
| | - Olena Ponomarenko
- Molecular and Environmental Science Research Group, Department of Geological Sciences, University of Saskatchewan, Saskatoon, SK, Canada
| | - Michiko Saito
- Department of Plant Bio Sciences, Faculty of Agriculture, Iwate University, Morioka, Iwate, Japan
| | - Mohammad Aslam
- Department of Plant Bio Sciences, Faculty of Agriculture, Iwate University, Morioka, Iwate, Japan
| | - Olga Antipova
- Argonne National Lab, Advanced Photon Source, XSD-MIC, Lemont, IL, USA
| | - Natalia Dolgova
- Molecular and Environmental Science Research Group, Department of Geological Sciences, University of Saskatchewan, Saskatoon, SK, Canada
| | - Cheyenne D. Kiani
- Molecular and Environmental Science Research Group, Department of Geological Sciences, University of Saskatchewan, Saskatoon, SK, Canada
| | - Susan Nehzati
- Molecular and Environmental Science Research Group, Department of Geological Sciences, University of Saskatchewan, Saskatoon, SK, Canada
| | - Keitaro Tanoi
- Isotope Facility for Agricultural Education and Research, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Katsuyuki Minegishi
- Department of Radiopharmaceuticals Development, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Inage, Chiba, Japan
| | - Kotaro Nagatsu
- Department of Radiopharmaceuticals Development, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Inage, Chiba, Japan
| | - Takehiro Kamiya
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Toru Fujiwara
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Christian Luschnig
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna (BOKU), Muthgasse 18, 1180 Wien, Austria
| | - Karen Tanino
- Department of Plant Sciences, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, SK, Canada
| | - Ingrid Pickering
- Molecular and Environmental Science Research Group, Department of Geological Sciences, University of Saskatchewan, Saskatoon, SK, Canada
| | - Graham N. George
- Molecular and Environmental Science Research Group, Department of Geological Sciences, University of Saskatchewan, Saskatoon, SK, Canada
| | - Abidur Rahman
- United Graduate School of Agricultural Sciences, Iwate University, Morioka, Iwate, Japan
- Department of Plant Bio Sciences, Faculty of Agriculture, Iwate University, Morioka, Iwate, Japan
- Agri-Innovation Center, Iwate University, Morioka, Iwate, Japan
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Shikanai Y, Yoshida R, Hirano T, Enomoto Y, Li B, Asada M, Yamagami M, Yamaguchi K, Shigenobu S, Tabata R, Sawa S, Okada H, Ohya Y, Kamiya T, Fujiwara T. Callose Synthesis Suppresses Cell Death Induced by Low-Calcium Conditions in Leaves. Plant Physiol 2020; 182:2199-2212. [PMID: 32024698 PMCID: PMC7140939 DOI: 10.1104/pp.19.00784] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 12/17/2019] [Indexed: 05/08/2023]
Abstract
Despite the importance of preventing calcium (Ca) deficiency disorders in agriculture, knowledge of the molecular mechanisms underlying plant adaptations to low-Ca conditions is limited. In this study, we provide evidence for a crucial involvement of callose synthesis in the survival of Arabidopsis (Arabidopsis thaliana) under low-Ca conditions. A mutant sensitive to low-Ca conditions, low calcium sensitive3 (lcs3), exhibited high levels of cell death in emerging leaves and had defects in its expanding true leaves under low-Ca conditions. Further analyses showed that the causal mutation was located in a putative β-1,3-glucan (callose) synthase gene, GLUCAN SYNTHASE-LIKE10 (GSL10). Yeast complementation assay results showed that GSL10 encodes a functional callose synthase. Ectopic callose significantly accumulated in wild-type plants under low-Ca conditions, but at a low level in lcs3 The low-Ca sensitivity of lcs3 was phenocopied by the application of callose synthase inhibitors in wild-type plants, which resulted in leaf expansion failure, cell death, and reduced ectopic callose levels under low-Ca conditions. Transcriptome analyses showed that the expression of genes related to cell wall and defense responses was altered in both wild-type plants under low-Ca conditions and in lcs3 under normal-Ca conditions, suggesting that GSL10 is required for the alleviation of both cell wall damage and defense responses caused by low Ca levels. These results suggest that callose synthesis is essential for the prevention of cell death under low-Ca conditions and plays a key role in plants' survival strategies under low-Ca conditions.
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Affiliation(s)
- Yusuke Shikanai
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
| | - Ryosuke Yoshida
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
| | - Tomoko Hirano
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
| | - Yusuke Enomoto
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
| | - Baohai Li
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
| | - Mayu Asada
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
| | - Mutsumi Yamagami
- Department of Radioecology, Institute of Environmental Sciences, Aomori 039-3212, Japan
| | - Katsushi Yamaguchi
- NIBB Core Research Facilities, National Institute for Basic Biology, Aichi 444-8585, Japan
| | - Shuji Shigenobu
- NIBB Core Research Facilities, National Institute for Basic Biology, Aichi 444-8585, Japan
| | - Ryo Tabata
- Graduate School of Bioagricultural Sciences, Nagoya University, Aichi 464-8601, Japan
| | - Shinichiro Sawa
- Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan
| | - Hiroki Okada
- Graduate School of Frontier Sciences, University of Tokyo, Chiba 277-8562, Japan
| | - Yoshikazu Ohya
- Graduate School of Frontier Sciences, University of Tokyo, Chiba 277-8562, Japan
| | - Takehiro Kamiya
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
- Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, Saitama 332-0012, Japan
| | - Toru Fujiwara
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
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Kamiya T, Hira D, Hoshino N, Kurihara M, Nakagawa M, Sasaki M, Terada T. MON-PO405: Prolonging Factors of the Duration of Parenteral Nutrition in Patients Treated with Hematopoietic Stem Cell Transplantation. Clin Nutr 2019. [DOI: 10.1016/s0261-5614(19)32238-1] [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: 11/29/2022]
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30
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Mermod M, Takusagawa M, Kurata T, Kamiya T, Fujiwara T, Shikanai T. SQUAMOSA promoter-binding protein-like 7 mediates copper deficiency response in the presence of high nitrogen in Arabidopsis thaliana. Plant Cell Rep 2019; 38:835-846. [PMID: 31093688 DOI: 10.1007/s00299-019-02422-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [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: 02/13/2019] [Accepted: 04/30/2019] [Indexed: 06/09/2023]
Abstract
SQUAMOSA promoter-binding protein-like 7 mediates copper deficiency response in the presence of high nitrogen even with the sufficient level of copper in Arabidopsis thaliana. Under copper (Cu) deficiency, accumulation of mRNA encoding two Cu/Zn superoxide dismutases, CSD1 and CSD2, is downregulated to save Cu for plastocyanin. This downregulation depends on miR398 and is under the control of SQUAMOSA promoter-binding protein-like7 (SPL7). Arabidopsis seedlings are routinely cultured on Murashige and Skoog medium. However, the high nitrogen (N) content of the medium (60 mM) has been shown to induce a similar response to Cu deficiency. The mRNA and protein levels of CSD1 and CSD2 are reduced under high N conditions, even if the Cu concentration in the medium is sufficient (0.1-0.5 µM). In this study, we show that this symptom, similar to the Cu deficiency, occurred in the presence of high N largely depending on SPL7, suggesting that plants actually sensed Cu deficiency. However, a change in N concentration in the medium did not influence the total Cu concentration in shoots or roots. High N did not increase the protein content in leaves but facilitated rapid seedling growth. We speculate that this rapid growth causes a continuous Cu deficiency mainly because of high Cu uptake by mesophyll cells in the leaves. This idea was supported by the observation that plastocyanin did not overaccumulate at the range of 0.1-0.5 µM Cu with 30 mM N. In contrast, in the presence of 5 µM Cu with 30 mM N, plants accumulate more Cu in plastocyanin in the thylakoid lumen, resulting in a slight Cu deficiency in the chloroplast stroma. This process is independent of SPL7.
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Affiliation(s)
- Mélanie Mermod
- Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
| | - Mari Takusagawa
- Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
| | - Teruyuki Kurata
- Graduate School of Agriculture, Kyushu University, Fukuoka, 812-8581, Japan
| | - Takehiro Kamiya
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 113-8657, Japan
| | - Toru Fujiwara
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 113-8657, Japan
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Tanaka-Takada N, Kobayashi A, Takahashi H, Kamiya T, Kinoshita T, Maeshima M. Plasma Membrane-Associated Ca2+-Binding Protein PCaP1 is Involved in Root Hydrotropism of Arabidopsis thaliana. Plant Cell Physiol 2019; 60:1331-1341. [PMID: 30828737 DOI: 10.1093/pcp/pcz042] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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: 10/24/2017] [Accepted: 02/21/2019] [Indexed: 05/26/2023]
Abstract
Root hydrotropism is an essential growth response to water potential gradients in plants. To understand the mechanism, fundamental elements such as MIZU-KUSSEI 1 (MIZ1) have been investigated extensively. We investigated the physiological role of a plasma membrane-associated cation-binding protein (PCaP1) and examined the effect of PCaP1 loss-of-function mutations on root hydrotropism. pcap1 knockout mutants showed a defect in root bending as a hydrotropic response, although gravitropism was normal in pcap1 mutants. When pcap1 seedlings were treated with abscisic acid, a negative regulator of gravitropism, the seedlings showed normal gravitropism. The hydrotropism defect in pcap1 mutants was clearly rescued by introducing the genomic sequence of PCaP1 with an endodermis-specific promoter. Analysis of PCaP1-greenfluorescent protein-expressing roots by confocal laser scanning microscopy revealed that PCaP1 was stably associated with the plasma membrane in most cells, but in the cytoplasm of endodermal cells at the bending region. Furthermore, we prepared a transgenic line overexpressing MIZ1 on the pcap1 background and found that the pcap1 hydrotropism defect was rescued. Our results indicate that PCaP1 in the endodermal cells of the root elongation zone is involved in the hydrotropic response. We suggest that PCaP1 contributes to hydrotropism through a MIZ1-independent pathway or as one of the upstream components that transduce water potential signals to MIZ1.
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Affiliation(s)
- Natsuki Tanaka-Takada
- Laboratory of Cell Dynamics, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
- Institute for Advanced Research, Nagoya University, Nagoya, Japan
| | - Akie Kobayashi
- Laboratory of Plant Sennsory and Developmental Biology, Graduate School of Life Sciences, Tohoku University, Sendai, Japan
| | - Hideyuki Takahashi
- Laboratory of Plant Sennsory and Developmental Biology, Graduate School of Life Sciences, Tohoku University, Sendai, Japan
| | - Takehiro Kamiya
- Laboratory of Plant Nutrition and Fertilizers, Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo, Japan
| | - Toshinori Kinoshita
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Chikusa, Nagoya, Japan
- Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa, Nagoya, Japan
| | - Masayoshi Maeshima
- Laboratory of Cell Dynamics, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
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32
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Sotta N, Bian B, Peng D, Hongkham P, Kamiya T, Niikura S, Fujiwara T. Local boron concentrations in tuberous roots of Japanese radish (Raphanus sativus L.) negatively correlate with distribution of brown heart. Plant Physiol Biochem 2019; 136:58-66. [PMID: 30654288 DOI: 10.1016/j.plaphy.2018.12.027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 09/24/2018] [Revised: 12/26/2018] [Accepted: 12/28/2018] [Indexed: 06/09/2023]
Abstract
Internal browning (or brown heart) in radish is a physiological disorder, manifested as a reddish pigmentation in the central part of the tuberous root. Boron deficiency has been known to induce brown heart, but the relationship between B tissue concentration and the development of brown heart has not been tested. Here, we examined the relationship between these variables. Dissected root tissues of two inbred lines (i.e., cultivars) of East Asian big long radish exhibiting different severity of brown heart were submitted to inductively coupled plasma mass spectrometry (ICP-MS) analysis to reveal the spatial distribution of 19 chemical elements. Statistical analysis revealed that only B correlated negatively with the severity of brown heart. There was no significant difference in the average B concentration between the two cultivars, suggesting that differences in the efficient use of local B may be responsible for the variation in brown heart resistance between the two cultivars.
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Affiliation(s)
- Naoyuki Sotta
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo, 113-8657, Japan
| | - Bian Bian
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo, 113-8657, Japan
| | - Danhan Peng
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo, 113-8657, Japan
| | - Phattharawan Hongkham
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo, 113-8657, Japan
| | - Takehiro Kamiya
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo, 113-8657, Japan
| | - Satoshi Niikura
- Tohoku Seed Company, 1625 Nishihara, Himuro, Utsunomiya, Tochigi, 321-3232, Japan
| | - Toru Fujiwara
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo, 113-8657, Japan.
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33
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Kambara Y, Hiramatsu K, Kato T, Sibata Y, Yoshihara M, Aoba T, Aiba T, Yamaguchi N, Kamiya T. Randomized clinical trial of single skin sterilization with a povidone-iodine applicator versus conventional skin sterilization in abdominal surgery. BJS Open 2019; 3:282-287. [PMID: 31183443 PMCID: PMC6551405 DOI: 10.1002/bjs5.50144] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2018] [Accepted: 01/17/2019] [Indexed: 11/25/2022] Open
Abstract
Background The efficacy of widely used povidone–iodine applicators for skin sterilization in abdominal surgery is unclear. The aim of this trial was to evaluate whether sterilization with a povidone–iodine applicator was not inferior to a conventional sterilization method. Methods Patients undergoing elective abdominal surgery were assigned randomly to receive single sterilization with the applicator or conventional sterilization. The primary endpoint was wound infection rate. Secondary endpoints were rate of organ/space surgical‐site infection (SSI), adverse effects of povidone–iodine, amount of povidone–iodine used and total cost of sterilization. Results Of 498 patients eligible for the study between April 2015 and September 2017, 240 were assigned and analysed in the applicator group and 246 in the conventional group. Wound infection was detected in 16 patients (6·7 per cent) in the applicator group and 16 (6·5 per cent) in the conventional group (absolute difference 0·0016 (90 per cent c.i. −0·037 to 0·040) per cent; P = 0·014 for non‐inferiority). There was no difference between the groups in the organ/space SSI rate (11 patients (4·6 per cent) in the applicator group and 16 (6·5 per cent) in the conventional group. Both the amount of povidone–iodine used and the total cost of sterilization were higher in the conventional group than in the applicator group (median 76·7 versus 25 ml respectively, P < 0·001; median €7·0 versus €6·4, P < 0·001). Skin irritation was detected in three patients in the conventional group. Conclusion In abdominal surgery, this povidone–iodine applicator was not inferior to conventional sterilization in terms of the wound infection rate, and it is cheaper. Registration number: UMIN000018231 (http://www.umin.ac.jp/ctr/).
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Affiliation(s)
- Y Kambara
- Department of General Surgery Toyohashi Municipal Hospital Toyohashi Japan.,Department of Gastrointestinal Surgery Japanese Red Cross Nagoya First Hospital Nagoya Japan
| | - K Hiramatsu
- Department of General Surgery Toyohashi Municipal Hospital Toyohashi Japan
| | - T Kato
- Department of General Surgery Toyohashi Municipal Hospital Toyohashi Japan
| | - Y Sibata
- Department of General Surgery Toyohashi Municipal Hospital Toyohashi Japan
| | - M Yoshihara
- Department of General Surgery Toyohashi Municipal Hospital Toyohashi Japan
| | - T Aoba
- Department of General Surgery Toyohashi Municipal Hospital Toyohashi Japan
| | - T Aiba
- Department of General Surgery Toyohashi Municipal Hospital Toyohashi Japan.,Division of Surgical Oncology, Department of Surgery Nagoya University Graduate School of Medicine Nagoya Japan
| | - N Yamaguchi
- Department of General Surgery Toyohashi Municipal Hospital Toyohashi Japan.,Department of Surgery Nagoya Ekisaikai Hospital Nagoya Japan
| | - T Kamiya
- Department of General Surgery Toyohashi Municipal Hospital Toyohashi Japan
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Hida T, Okura M, Kamiya T, Yamamoto M, Hori T, Uhara H. A case of childhood-onset cutaneous mastocytosis with loss of wild-type KIT allele. J Eur Acad Dermatol Venereol 2019; 33:e235-e237. [PMID: 30773694 DOI: 10.1111/jdv.15501] [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: 11/29/2022]
Affiliation(s)
- T Hida
- Department of Dermatology, Sapporo Medical University School of Medicine, South 1, West 16, Chuo-ku, Sapporo, 060-8543, Japan
| | - M Okura
- Department of Dermatology, Sapporo Medical University School of Medicine, South 1, West 16, Chuo-ku, Sapporo, 060-8543, Japan
| | - T Kamiya
- Department of Dermatology, Sapporo Medical University School of Medicine, South 1, West 16, Chuo-ku, Sapporo, 060-8543, Japan
| | - M Yamamoto
- Department of Pediatrics, Sapporo Medical University School of Medicine, South 1, West 16, Chuo-ku, Sapporo, 060-8543, Japan
| | - T Hori
- Department of Pediatrics, Sapporo Medical University School of Medicine, South 1, West 16, Chuo-ku, Sapporo, 060-8543, Japan
| | - H Uhara
- Department of Dermatology, Sapporo Medical University School of Medicine, South 1, West 16, Chuo-ku, Sapporo, 060-8543, Japan
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Lu P, Moriwaki Y, Zhang M, Katayama Y, Lu Y, Okamoto K, Terada T, Shimizu K, Wang M, Kamiya T, Fujiwara T, Asakura T, Suzuki M, Yoshimura E, Nagata K. Functional characterisation of two ferric-ion coordination modes of TtFbpA, the periplasmic subunit of an ABC-type iron transporter from Thermus thermophilus HB8. Metallomics 2019; 11:2078-2088. [DOI: 10.1039/c9mt00245f] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ferric ion binding protein A of Thermus thermophilus HB8 (TtFbpA) is the periplasmic subunit of an ABC-type iron transporter.
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36
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Kodama K, Kamiya T, Ichimura M, Nakamura M. Digital Archives for Nuclear Emulsion Data. EPJ Web Conf 2019. [DOI: 10.1051/epjconf/201920813003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Digital archives for nuclear emulsion data of past experiments, such as in cosmic-ray and accelerator physics, is being studied and prepared. Significant progress of HTS, which is an automatic read-out system for tracks recorded in emulsion, is achieving a read-out speed of about 1m2/hour and opens a possibility to read all tracks recorded in emulsion of past experiments. Current status of our first trial with RUNJOB emulsion plates is reported. Till now, the top-most 10 plates had been scanned by HTS and preliminary data is presented.
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37
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Inada Y, Kamiya T, Nagai H, Matsuoka S, Kumada A, Ikeda H, Hidaka K. Talbot interferometry for imaging two-dimensional electron density distribution over discharge plasma with higher sensitivity. Rev Sci Instrum 2018; 89:123112. [PMID: 30599556 DOI: 10.1063/1.5049199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Accepted: 11/28/2018] [Indexed: 06/09/2023]
Abstract
The basic properties of a Talbot interferometer implementing pinhole arrays were experimentally and numerically investigated for the improvement of measurement sensitivity of laser wavefront sensors utilized for electron density imaging over discharge plasmas. A numerical simulation using a plane wave decomposition method indicated that the pinhole arrays with a pitch of 300 μm and a pinhole diameter of 150 μm were most suitable for the measurement of the millimetre-scale discharge plasmas, in consideration of the spatial resolution and measurement accuracy. The plane wave decomposition simulation expected that the measurement sensitivity of the 8th-Talbot-length interferometer could be improved by a factor of 4 compared with the previously developed Shack-Hartmann type laser wavefront sensors, which was experimentally verified by the self-image behavior of the pinhole arrays. The Talbot interferometric system was successfully used for electron density imaging over the vacuum arcs generated between a 3-mm gap. The electron density image observed by the Talbot interferometers was in excellent agreement with that visualized by the previously developed Shack-Hartmann sensors. The practical notification for the pinhole array fabrication was also presented.
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Affiliation(s)
- Y Inada
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-8656, Japan
| | - T Kamiya
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-8656, Japan
| | - H Nagai
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-8656, Japan
| | - S Matsuoka
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-8656, Japan
| | - A Kumada
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-8656, Japan
| | - H Ikeda
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-8656, Japan
| | - K Hidaka
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-8656, Japan
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38
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Teramoto A, Shoji H, Kura H, Sakakibara Y, Kamiya T, Watanabe K, Yamashita T. Investigation of factors related to the occurrence of osteochondral lesions of the talus by 3D bone morphology of the ankle. Bone Joint J 2018; 100-B:1487-1490. [DOI: 10.1302/0301-620x.100b11.bjj-2018-0346.r1] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Aims The aims of this study were to evaluate the morphology of the ankle in patients with an osteochondral lesion of the talus using 3D CT, and to investigate factors that predispose to this condition. Patients and Methods The study involved 19 patients (19 ankles) who underwent surgery for a medial osteochondral lesion (OLT group) and a control group of 19 healthy patients (19 ankles) without ankle pathology. The mean age was significantly lower in the OLT group than in the control group (27.0 vs 38.9 years; p = 0.02). There were 13 men and six women in each group. 3D CT models of the ankle were made based on Digital Imaging and Communications in Medicine (DICOM) data. The medial malleolar articular and tibial plafond surface, and the medial and lateral surface area of the trochlea of the talus were defined. The tibial axis-medial malleolus (TMM) angle, the medial malleolar surface area and volume (MMA and MMV) and the anterior opening angle of the talus were measured. Results The mean TMM angle was significantly larger in the OLT group (34.2°, sd 4.4°) than in the control group (29.2°, sd 4.8°; p = 0.002). The mean MMA and MMV were significantly smaller in the OLT group than in the control group (219.8 mm2, sd 42.4) vs (280.5 mm2, sd 38.2), and (2119.9 mm3, sd 562.5) vs (2646.4 mm3, sd 631.4; p < 0.01 and p = 0.01, respectively). The mean anterior opening angle of the talus was significantly larger in the OLT group than in the control group (15.4°, sd 3.9°) vs (10.2°, sd 3.6°; p < 0.001). Conclusion 3D CT measurements showed that, in patients with a medial osteochondral lesion of the talus, the medial malleolus opens distally, the MMA and MMV are small, and the anterior opening angle of the talus is large. This suggests that abnormal morphology of the ankle predisposes to the development of osteochondral lesions of the talus. Cite this article: Bone Joint J 2018;100-B:1487–90.
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Affiliation(s)
- A. Teramoto
- Department of Orthopaedic Surgery, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - H. Shoji
- Department of Orthopaedic Surgery, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - H. Kura
- Department of Orthopaedic Surgery, Hitsujigaoka Hospital, Sapporo, Japan
| | - Y. Sakakibara
- Department of Orthopaedic Surgery, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - T. Kamiya
- Department of Orthopaedic Surgery, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - K. Watanabe
- Second Division of Physical Therapy, Sapporo Medical University School of Health Science, Sapporo, Japan
| | - T. Yamashita
- Department of Orthopaedic Surgery, Sapporo Medical University School of Medicine, Sapporo, Japan
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Abstract
SummaryA case of congenital combined deficiency of factor V and factor VIII was reported. The patient, a 9 year old boy, gave a history of epistaxis, hematomas, and of hemorrhages following dental extraction since the age of 2 ; plasma levels of factor V and factor VIII were found to be 16% and 8% of normal, respectively. No one in his family had a deficiency of either factor. The effects of transfusion of normal fresh plasma and whole blood from a patient with hemophilia A were studied. While the former were similar to the pattern as seen in classical hemophilia, the latter consisted of an immediate increase of factor V activity and a delayed increase of factor VIII activity, despite the fact that factor VIII activity was almost absent from the donor’s blood.
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Araki R, Mermod M, Yamasaki H, Kamiya T, Fujiwara T, Shikanai T. SPL7 locally regulates copper-homeostasis-related genes in Arabidopsis. J Plant Physiol 2018; 224-225:137-143. [PMID: 29635212 DOI: 10.1016/j.jplph.2018.03.014] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [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: 02/02/2018] [Revised: 03/19/2018] [Accepted: 03/23/2018] [Indexed: 06/08/2023]
Abstract
In Arabidopsis, a central regulator of copper (Cu) homeostasis is the transcription factor SQUAMOSA promoter binding protein-like7 (SPL7). Under Cu deficiency, SPL7 induces the expression of miR398, which suppresses the expression of the genes CSD1 and CSD2, which encode cytosolic and chloroplastic isoforms of Cu/Zn superoxide dismutase, respectively. Consequently, the limited Cu is preferentially assigned to plastocyanin, which is essential for photosynthetic electron transport. Consistent with this function of miR398 related to photosynthesis, its expression is strongly induced in leaves. In this study, however, we showed that SPL7 was transcribed mainly around the vasculature in roots, where Cu levels were likely sensed. To test the possible long-distance signaling of Cu availability from roots to shoots, we conducted a series of grafting experiments using spl7 mutant and wild-type (WT) plants. Expression of Cu-responsive microRNAs and the resulting suppression of CSD1 and CSD2 mRNAs were observed in leaves only when the aerial part was from WT plants, in which a low level of SPL7 was transcribed also in the vascular tissues. Although local sensing of Cu was disturbed in the spl7 mutant, the Cu level was not affected in the shoots. SPL7 is expressed in specific cell layers in both roots and shoots and locally senses Cu availability, transmitting the information to surrounding cells.
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Affiliation(s)
- Ryoichi Araki
- Department of Botany, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan; Faculty of Education, Wakayama University, Wakayama 640-8510, Japan
| | - Mélanie Mermod
- Department of Botany, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Hiroaki Yamasaki
- Department of Botany, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Takehiro Kamiya
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
| | - Toru Fujiwara
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
| | - Toshiharu Shikanai
- Department of Botany, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
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Bian B, Kageshima S, Yano K, Fujiwara T, Kamiya T. Screening Arabidopsis thaliana mutants for low sensitivity to manganese identifies novel alleles of NRAMP1 and PGSIP6. J Exp Bot 2018; 69:1795-1803. [PMID: 29365153 PMCID: PMC5888932 DOI: 10.1093/jxb/ery018] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [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: 09/22/2017] [Accepted: 01/11/2018] [Indexed: 05/09/2023]
Abstract
Manganese (Mn) is an essential micronutrient; however, few genes required for growth under low-Mn conditions have been identified. In this study, we isolated Arabidopsis thaliana mutants sensitive to low-Mn conditions from ethyl methanesulfonate-mutagenized seeds. Among them, we identified the causal genes of two mutants. One mutant (35-34) exhibited a short root phenotype and low Mn concentration in the shoots. The other mutant (30-11) exhibited a small shoot phenotype with Mn concentrations similar to the control. Genetic mapping, allelism tests, and gene complementation tests identified the causal genes as At1g80830 (NRAMP1) for 35-34 and At5g18480 (PGSIP6) for 30-11. NRAMP1 was previously reported to be essential for Mn uptake under low-Mn conditions, thus validating our screening method. PGSIP6 encodes inositol phosphorylceramide glucuronosyltransferase, which is involved in glycosyl inositol phosphorylceramide sphingolipid glycosylation. PGSIP6-green fluorescent protein was localized to the Golgi apparatus, which is consistent with its function in the glycosylation of sphingolipids. Our screening identified a novel gene required for low-Mn tolerance, and we also provide new insights towards understanding the physiological function of PGSIP6.
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Affiliation(s)
- Bian Bian
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, Japan
| | - Sae Kageshima
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, Japan
| | - Kenji Yano
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, Japan
| | - Toru Fujiwara
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, Japan
| | - Takehiro Kamiya
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, Japan
- Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency, Saitama, Japan
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Uraguchi S, Tanaka N, Hofmann C, Abiko K, Ohkama-Ohtsu N, Weber M, Kamiya T, Sone Y, Nakamura R, Takanezawa Y, Kiyono M, Fujiwara T, Clemens S. Phytochelatin Synthase has Contrasting Effects on Cadmium and Arsenic Accumulation in Rice Grains. Plant Cell Physiol 2017; 58:1730-1742. [PMID: 29016913 PMCID: PMC5914395 DOI: 10.1093/pcp/pcx114] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [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: 06/27/2017] [Accepted: 08/03/2017] [Indexed: 05/18/2023]
Abstract
Phytochelatin (PC) synthesis has been well demonstrated as a major metal tolerance mechanism in Arabidopsis thaliana, whereas its contribution to long-distance element transport especially in monocots remains elusive. Using rice as a cereal model, we examined physiological roles of Oryza sativa phytochelatin synthase 1 (OsPCS1) in the distribution and detoxification of arsenic (As) and cadmium (Cd), two toxic elements associated with major food safety concerns. First, we isolated four different transcript variants of OsPCS1 as well as one from OsPCS2. Quantitative real-time reverse transcription-PCR (RT-PCR) of each OsPCS transcript in rice seedlings suggested that expression of OsPCS1full, the longest OsPCS1 variant, was most abundant, followed by OsPCS2. Heterologous expression of OsPCS variants in PCS-deficient mutants of Schizosaccharomyces pombe and A. thaliana suggested that OsPCS1full possessed PCS activity in response to As(III) and Cd while the activity of other PCS variants was very low. To address physiological functions in toxic element tolerance and accumulation, two independent OsPCS1 mutant rice lines (a T-DNA and a Tos17 insertion line) were identified. The OsPCS1 mutants exhibited increased sensitivity to As(III) and Cd in hydroponic experiments, showing the importance of OsPCS1-dependent PC synthesis for rice As(III) and Cd tolerance. Elemental analyses of rice plants grown in soil with environmentally relevant As and Cd concentrations showed increased As accumulation and decreased Cd accumulation in grains of the T-DNA line. The Tos17 mutant also exhibited the reduced Cd accumulation phenotype. These contrasting effects on As and Cd distribution to grains suggest the existence of at least partially distinct PC-dependent pathways for As and Cd.
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Affiliation(s)
- Shimpei Uraguchi
- Department of Public Health, School of Pharmacy, Kitasato University, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
- Department of Plant Physiology, University of Bayreuth, Universitätsstrasse 30, D-95440 Bayreuth, Germany
| | - Nobuhiro Tanaka
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Christian Hofmann
- Department of Plant Physiology, University of Bayreuth, Universitätsstrasse 30, D-95440 Bayreuth, Germany
| | - Kaho Abiko
- Department of Public Health, School of Pharmacy, Kitasato University, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
| | - Naoko Ohkama-Ohtsu
- Institute of Agricultural Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwaicho, Fuchu, Tokyo 183-8509, Japan
| | - Michael Weber
- Department of Plant Physiology, University of Bayreuth, Universitätsstrasse 30, D-95440 Bayreuth, Germany
| | - Takehiro Kamiya
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Yuka Sone
- Department of Public Health, School of Pharmacy, Kitasato University, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
| | - Ryosuke Nakamura
- Department of Public Health, School of Pharmacy, Kitasato University, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
| | - Yasukazu Takanezawa
- Department of Public Health, School of Pharmacy, Kitasato University, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
| | - Masako Kiyono
- Department of Public Health, School of Pharmacy, Kitasato University, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
| | - Toru Fujiwara
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Stephan Clemens
- Department of Plant Physiology, University of Bayreuth, Universitätsstrasse 30, D-95440 Bayreuth, Germany
- Corresponding author: E-mail, ; Fax, +49-921-552642
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Onoue H, Murakami K, Yoshizawa K, Yokota T, Norimine S, Akaiwa Y, Kamiya F, Ogawa T, Kamiya T, Hara M, Takiguchi Y, Numahata K, Yamaguchi Y, Tamura N, Miyamoto T. Successful amyotrophic lateral sclerosis treated with edaravone circle support network building from Dokkyo Medical University Koshigaya hospital (Successful allstar net from DMUK). J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.1994] [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: 11/27/2022]
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Shimizu T, Uchigiri C, Mizuno S, Kamiya T, Kokubo Y. Adsorption of Anaphylatoxins and Platelet-Specific Proteins by Filtration of Platelet Concentrates with a Polyester Leukocyte Reduction Filter. Vox Sang 2017. [DOI: 10.1159/000462502] [Citation(s) in RCA: 2] [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] [Indexed: 11/19/2022]
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45
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Duan G, Hakoyama T, Kamiya T, Miwa H, Lombardo F, Sato S, Tabata S, Chen Z, Watanabe T, Shinano T, Fujiwara T. LjMOT1, a high-affinity molybdate transporter from Lotus japonicus, is essential for molybdate uptake, but not for the delivery to nodules. Plant J 2017; 90:1108-1119. [PMID: 28276145 DOI: 10.1111/tpj.13532] [Citation(s) in RCA: 16] [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: 01/19/2017] [Revised: 03/01/2017] [Accepted: 03/01/2017] [Indexed: 05/06/2023]
Abstract
Molybdenum (Mo) is an essential nutrient for plants, and is required for nitrogenase activity of legumes. However, the pathways of Mo uptake from soils and then delivery to the nodules have not been characterized in legumes. In this study, we characterized a high-affinity Mo transporter (LjMOT1) from Lotus japonicus. Mo concentrations in an ethyl methanesulfonate-mutagenized line (ljmot1) decreased by 70-95% compared with wild-type (WT). By comparing the DNA sequences of four AtMOT1 homologs between mutant and WT lines, one point mutation was found in LjMOT1, which altered Trp292 to a stop codon; no mutation was found in the other homologous genes. The phenotype of Mo concentrations in F2 progeny from ljmot1 and WT crosses were associated with genotypes of LjMOT1. Introduction of endogenous LjMOT1 to ljmot1 restored Mo accumulation to approximately 60-70% of the WT. Yeast expressing LjMOT1 exhibited high Mo uptake activity, and the Km was 182 nm. LjMOT1 was expressed mainly in roots, and its expression was not affected by Mo supply or rhizobium inoculation. Although Mo accumulation in the nodules of ljmot1 was significantly lower than that of WT, it was still high enough for normal nodulation and nitrogenase activity, even for cotyledons-removed ljmot1 plants grown under low Mo conditions, in this case the plant growth was significantly inhibited by Mo deficiency. Our results suggest that LjMOT1 is an essential Mo transporter in L. japonicus for Mo uptake from the soil and growth, but is not for Mo delivery to the nodules.
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Affiliation(s)
- Guilan Duan
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Tsuneo Hakoyama
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Takehiro Kamiya
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Hiroki Miwa
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Fabien Lombardo
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
- National Agriculture and Food Research Organization (NARO) Institute of Crop Science, Ibaraki, 305-8518, Japan
| | - Shusei Sato
- Kazusa DNA Research Institute, Kisarazu, Chiba, 292-0812, Japan
- Graduate School of Life Sciences, Tohoku University, Aoba-ku, Sendai, 980-8577, Japan
| | - Satoshi Tabata
- Kazusa DNA Research Institute, Kisarazu, Chiba, 292-0812, Japan
| | - Zheng Chen
- Graduate School of Agriculture, Hokkaido University, Kita-ku, Sapporo, 010-8589, Japan
- Department of Environmental Science, Xi'an Jiaotong-Liverpool University, Suzhou, Jiangsu, 215123, China
| | - Toshihiro Watanabe
- Graduate School of Agriculture, Hokkaido University, Kita-ku, Sapporo, 010-8589, Japan
| | - Takuro Shinano
- Graduate School of Agriculture, Hokkaido University, Kita-ku, Sapporo, 010-8589, Japan
- NARO Tohoku Agricultural Research Center, Arai, Fukushima, 960-2156, Japan
| | - Toru Fujiwara
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
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Sugimoto M, Ban H, Hira D, Kamiya T, Otsuka T, Inatomi O, Bamba S, Terada T, Andoh A. Letter: CYP3A4/5 genotype status and outcome of vonoprazan-containing Helicobacter pylori eradication therapy in Japan. Aliment Pharmacol Ther 2017; 45:1009-1010. [PMID: 28256082 DOI: 10.1111/apt.13959] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [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: 12/12/2022]
Affiliation(s)
- M Sugimoto
- Division of Digestive Endoscopy, Shiga University of Medical Science Hospital, Shiga, Japan
| | - H Ban
- Division of Digestive Endoscopy, Shiga University of Medical Science Hospital, Shiga, Japan
| | - D Hira
- Department of Pharmacy, Shiga University of Medical Science Hospital, Shiga, Japan
| | - T Kamiya
- Department of Pharmacy, Shiga University of Medical Science Hospital, Shiga, Japan
| | - T Otsuka
- Department of Gastroenterology, Shiga University of Medical Science Hospital, Shiga, Japan
| | - O Inatomi
- Department of Gastroenterology, Shiga University of Medical Science Hospital, Shiga, Japan
| | - S Bamba
- Department of Gastroenterology, Shiga University of Medical Science Hospital, Shiga, Japan
| | - T Terada
- Department of Pharmacy, Shiga University of Medical Science Hospital, Shiga, Japan
| | - A Andoh
- Department of Gastroenterology, Shiga University of Medical Science Hospital, Shiga, Japan
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Otsubo H, Akatsuka Y, Takashima H, Suzuki T, Suzuki D, Kamiya T, Ikeda Y, Matsumura T, Yamashita T, Shino K. MRI depiction and 3D visualization of three anterior cruciate ligament bundles. Clin Anat 2016; 30:276-283. [DOI: 10.1002/ca.22810] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 11/14/2016] [Accepted: 11/14/2016] [Indexed: 11/07/2022]
Affiliation(s)
- H. Otsubo
- Department of Orthopedic Surgery; Sapporo Medical University School of Medicine; Sapporo Japan
| | - Y. Akatsuka
- Department of Radiology; Sapporo Medical University Hospital; Sapporo Japan
| | - H. Takashima
- Department of Radiology; Sapporo Medical University Hospital; Sapporo Japan
| | - T. Suzuki
- Department of Orthopedic Surgery; Sapporo Medical University School of Medicine; Sapporo Japan
| | - D. Suzuki
- Musculoskeletal Biomechanics and Surgical Development; Sapporo Medical University; Japan
| | - T. Kamiya
- Department of Orthopedic Surgery; Sapporo Medical University School of Medicine; Sapporo Japan
| | - Y. Ikeda
- Department of Orthopedic Surgery; Sapporo Medical University School of Medicine; Sapporo Japan
| | - T. Matsumura
- Department of Orthopedic Surgery; Sapporo Medical University School of Medicine; Sapporo Japan
| | - T. Yamashita
- Department of Orthopedic Surgery; Sapporo Medical University School of Medicine; Sapporo Japan
| | - K. Shino
- Sports Orthopaedic Center, Yukioka Hospital; Osaka Japan
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Harada S, Ehara S, Sato T, Kamiya T, Sera K, Goto S, Ishii K. Imaging of Primary and Metastatic Tumors and Their Treatment Through Targeted Dendritic Cell–Mediated T-Cell Priming and Immune Checkpoint Blockade, Using Encapsulated Nanoparticles Directed by Radiation Therapy. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.2030] [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: 11/25/2022]
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49
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Oda K, Kamiya T, Shikanai Y, Shigenobu S, Yamaguchi K, Fujiwara T. The Arabidopsis Mg Transporter, MRS2-4, is Essential for Mg Homeostasis Under Both Low and High Mg Conditions. Plant Cell Physiol 2016; 57:754-63. [PMID: 26748081 DOI: 10.1093/pcp/pcv196] [Citation(s) in RCA: 12] [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: 09/03/2015] [Accepted: 11/25/2015] [Indexed: 05/20/2023]
Abstract
Magnesium (Mg) is an essential macronutrient, functioning as both a cofactor of many enzymes and as a component of Chl. Mg is abundant in plants; however, further investigation of the Mg transporters involved in Mg uptake and distribution is needed. Here, we isolated an Arabidopsis thaliana mutant sensitive to high calcium (Ca) conditions without Mg supplementation. The causal gene of the mutant encodes MRS2-4, an Mg transporter.MRS2-4 single mutants exhibited growth defects under low Mg conditions, whereas an MRS2-4 and MRS2-7 double mutant exhibited growth defects even under normal Mg concentrations. Under normal Mg conditions, the Mg concentration of the MRS2-4 mutant was lower than that of the wild type. The transcriptome profiles of mrs2-4-1 mutants under normal conditions were similar to those of wild-type plants grown under low Mg conditions. In addition, both mrs2-4 and mrs2-7 mutants were sensitive to high levels of Mg. These results indicate that both MRS2-4 and MRS2-7 are essential for Mg homeostasis, even under normal and high Mg conditions. MRS2-4-green fluorescent protein (GFP) was mainly detected in the endoplasmic reticulum. These results indicate that these two MRS2 transporter genes are essential for the ability to adapt to a wide range of environmental Mg concentrations.
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Affiliation(s)
- Koshiro Oda
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657 Japan
| | - Takehiro Kamiya
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657 Japan
| | - Yusuke Shikanai
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657 Japan
| | - Shuji Shigenobu
- National Institute for Basic Biology, Okazaki, Aichi, 444-8585 Japan
| | | | - Toru Fujiwara
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657 Japan
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Kamiya T, Uehara K, Nakayama G, Ishigure K, Kobayashi S, Hiramatsu K, Nakayama H, Yamashita K, Sakamoto E, Tojima Y, Kawai S, Kodera Y, Nagino M. Early results of multicenter phase II trial of perioperative oxaliplatin and capecitabine without radiotherapy for high-risk rectal cancer: CORONA I study. Eur J Surg Oncol 2016; 42:829-35. [PMID: 26968228 DOI: 10.1016/j.ejso.2016.02.014] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 02/01/2016] [Accepted: 02/11/2016] [Indexed: 11/19/2022]
Abstract
BACKGROUNDS Perioperative introduction of developed chemotherapy into the treatment strategy for locally advanced rectal cancer (LARC) may be a promising option. However, the most prevalent treatment for high-risk LARC remains preoperative chemoradiotherapy (CRT) in Western countries. PATIENTS AND METHODS A phase II trial was undertaken to evaluate safety and efficacy of perioperative XELOX without radiotherapy (RT) for patients with high-risk LARC. Patients received 4 cycles of XELOX before and after surgery, respectively. Primary endpoint was disease-free survival. RESULTS We enrolled 41 patients between June 2012 and April 2014. The completion rate of the preoperative XELOX was 90.3%. Twenty-nine patients (70.7%) could start postoperative XELOX, 15 of these patients (51.7%) completed 4 cycles. Allergic reaction to oxaliplatin was experienced by 5 patients (17.2%) during postoperative XELOX. One patient received additional RT after preoperative XELOX. Consequently, the remaining 40 patients underwent primary resection. Major complications occurred in 6 of 40 patients (15.0%). Pathological complete response (pCR) rate was 12.2%, and good tumor regression was exhibited in 31.7%. N down-staging (cN+ to ypN0) and T down-staging were detected in 56.7% and 52.5%, respectively. Clinical T4 tumor was a predictor of poor pathological response (p < 0.001). CONCLUSIONS We could show the favorable pCR rate after preoperative XELOX alone. However, the T and N down-staging rate was likely to be insufficient. When tumor regression is essential for curative resection, the use of preoperative CRT is likely to be recommended. For patients with massive LN metastasis, the additional Bev to NAC might be a promising option.
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Affiliation(s)
- T Kamiya
- Division of Surgical Oncology, Department of Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - K Uehara
- Division of Surgical Oncology, Department of Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan.
| | - G Nakayama
- Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - K Ishigure
- Department of Surgery, Konan Kosei Hospital, Aichi, Japan
| | - S Kobayashi
- Department of Surgery, Toyota Kosei Hospital, Aichi, Japan
| | - K Hiramatsu
- Department of Surgery, Toyohashi Municipal Hospital, Aichi, Japan
| | - H Nakayama
- Department of Surgery, National Hospital Organization Nagoya Medical Center, Nagoya, Japan
| | - K Yamashita
- Department of Surgery, Toyohashi Medical Center, Aichi, Japan
| | - E Sakamoto
- Department of Surgery, Nagoya Daini Red Cross Hospital, Nagoya, Japan
| | - Y Tojima
- Department of Surgery, Chukyo Hospital, Nagoya, Japan
| | - S Kawai
- Department of Surgery, Tsushima City Hospital, Aichi, Japan
| | - Y Kodera
- Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - M Nagino
- Division of Surgical Oncology, Department of Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
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