1
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Kita K, Uchida M, Arie T, Teraoka T, Kaku H, Kanda Y, Mori M, Arazoe T, Kamakura T. The MAT1 locus is required for microconidia-mediated sexual fertility in the rice blast fungus. FEMS Microbiol Lett 2024; 371:fnae004. [PMID: 38305094 DOI: 10.1093/femsle/fnae004] [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: 07/20/2023] [Revised: 12/22/2023] [Accepted: 01/31/2024] [Indexed: 02/03/2024] Open
Abstract
Rice blast fungus (Pyricularia oryzae) is a heterothallic ascomycete that causes the most destructive disease in cultivated rice worldwide. This fungus reproduces sexually and asexually, and its mating type is determined by the MAT1 locus, MAT1-1 or MAT1-2. Interestingly, most rice-infecting field isolates show a loss of female fertility, but the MAT1 locus is highly conserved in female-sterile isolates. In this study, we performed a functional analysis of MAT1 using the CRISPR/Cas9 system in female- and male-fertile isolates and female-sterile (male-fertile) isolates. Consistent with a previous report, MAT1 was essential for sexual reproduction but not for asexual reproduction. Meanwhile, deletion mutants of MAT1-1-1, MAT1-1-2, and MAT1-1-3 exhibited phenotypes different from those of other previously described isolates, suggesting that the function of MAT1-1 genes and/or their target genes in sexual reproduction differs among strains or isolates. The MAT1 genes, excluding MAT1-2-6, retained their functions even in female-sterile isolates, and deletion mutants lead to loss or reduction of male fertility. Although MAT1 deletion did not affect microconidia (spermatia) production, microconidia derived from the mutants could not induce perithecia formation. These results indicated that MAT1 is required for microconidia-mediated male fertility in addition to female fertility in P. oryzae .
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Affiliation(s)
- Kohtetsu Kita
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 2788510, Japan
| | - Momotaka Uchida
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 2788510, Japan
| | - Tsutomu Arie
- United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology (TUAT), 3-5-8 Saiwai-cho, Fuchu, Tokyo 1830054, Japan
| | - Tohru Teraoka
- United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology (TUAT), 3-5-8 Saiwai-cho, Fuchu, Tokyo 1830054, Japan
| | - Hisatoshi Kaku
- JICA Tsukuba Center, Japan International Coorporation Agency, 3-6 Koyadai, Tsukuba, Ibaraki 3050074, Japan
- Division of Plant Molecular Regulation Research, Institute of Agrobiological Sciences, NARO (NIAS), 2-1-2 Kan-nondai, Tsukuba, Ibaraki 3058602, Japan
| | - Yasukazu Kanda
- Division of Plant Molecular Regulation Research, Institute of Agrobiological Sciences, NARO (NIAS), 2-1-2 Kan-nondai, Tsukuba, Ibaraki 3058602, Japan
| | - Masaki Mori
- Division of Plant Molecular Regulation Research, Institute of Agrobiological Sciences, NARO (NIAS), 2-1-2 Kan-nondai, Tsukuba, Ibaraki 3058602, Japan
| | - Takayuki Arazoe
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 2788510, Japan
| | - Takashi Kamakura
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 2788510, Japan
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2
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Uchida M, Konishi T, Fujigasaki A, Kita K, Arie T, Teraoka T, Kanda Y, Mori M, Arazoe T, Kamakura T. Dysfunctional Pro1 leads to female sterility in rice blast fungi. iScience 2023; 26:107020. [PMID: 37416480 PMCID: PMC10320130 DOI: 10.1016/j.isci.2023.107020] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 04/20/2023] [Accepted: 05/30/2023] [Indexed: 07/08/2023] Open
Abstract
Although sexual reproduction is widespread in eukaryotes, some fungal species can only reproduce asexually. In the rice blast fungus Pyricularia (Magnaporthe) oryzae, several isolates from the region of origin retain mating ability, but most isolates are female sterile. Therefore, female fertility may have been lost during its spread from the origin. Here, we show that functional mutations of Pro1, a global transcriptional regulator of mating-related genes in filamentous fungi, is one cause of loss of female fertility in this fungus. We identified the mutation of Pro1 by backcrossing analysis between female-fertile and female-sterile isolates. The dysfunctional Pro1 did not affect the infection processes but conidial release was increased. Furthermore, various mutations in Pro1 were detected in geographically distant P. oryzae, including pandemic isolates of wheat blast fungus. These results provide the first evidence that loss of female fertility may be advantageous to the life cycle of some plant pathogenic fungi.
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Affiliation(s)
- Momotaka Uchida
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Takahiro Konishi
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Ayaka Fujigasaki
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Kohtetsu Kita
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Tsutomu Arie
- United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology (TUAT), 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-0054, Japan
| | - Tohru Teraoka
- United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology (TUAT), 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-0054, Japan
| | - Yasukazu Kanda
- Division of Plant Molecular Regulation Research, Institute of Agrobiological Sciences, NARO (NIAS), 2-1-2 Kan-nondai, Tsukuba, Ibaraki 305-8602, Japan
| | - Masaki Mori
- Division of Plant Molecular Regulation Research, Institute of Agrobiological Sciences, NARO (NIAS), 2-1-2 Kan-nondai, Tsukuba, Ibaraki 305-8602, Japan
| | - Takayuki Arazoe
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Takashi Kamakura
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
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Kanda Y, Shinya T, Maeda S, Mujiono K, Hojo Y, Tomita K, Okada K, Kamakura T, Galis I, Mori M. BSR1, a Rice Receptor-like Cytoplasmic Kinase, Positively Regulates Defense Responses to Herbivory. Int J Mol Sci 2023; 24:10395. [PMID: 37373546 DOI: 10.3390/ijms241210395] [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: 05/19/2023] [Revised: 06/16/2023] [Accepted: 06/17/2023] [Indexed: 06/29/2023] Open
Abstract
Crops experience herbivory by arthropods and microbial infections. In the interaction between plants and chewing herbivores, lepidopteran larval oral secretions (OS) and plant-derived damage-associated molecular patterns (DAMPs) trigger plant defense responses. However, the mechanisms underlying anti-herbivore defense, especially in monocots, have not been elucidated. The receptor-like cytoplasmic kinase Broad-Spectrum Resistance 1 (BSR1) of Oryza sativa L. (rice) mediates cytoplasmic defense signaling in response to microbial pathogens and enhances disease resistance when overexpressed. Here, we investigated whether BSR1 contributes to anti-herbivore defense responses. BSR1 knockout suppressed rice responses triggered by OS from the chewing herbivore Mythimna loreyi Duponchel (Lepidoptera: Noctuidae) and peptidic DAMPs OsPeps, including the activation of genes required for biosynthesis of diterpenoid phytoalexins (DPs). BSR1-overexpressing rice plants exhibited hyperactivation of DP accumulation and ethylene signaling after treatment with simulated herbivory and acquired enhanced resistance to larval feeding. As the biological significance of herbivory-induced accumulation of rice DPs remains unexplained, their physiological activities in M. loreyi were analyzed. The addition of momilactone B, a rice DP, to the artificial diet suppressed the growth of M. loreyi larvae. Altogether, this study revealed that BSR1 and herbivory-induced rice DPs are involved in the defense against chewing insects, in addition to pathogens.
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Affiliation(s)
- Yasukazu Kanda
- Institute of Agrobiological Sciences, NARO (NIAS), Tsukuba 305-8634, Japan
- Department of Applied Biological Science, Graduate School of Science and Technology, Tokyo University of Science, Noda 278-8510, Japan
| | - Tomonori Shinya
- Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan
| | - Satoru Maeda
- Institute of Agrobiological Sciences, NARO (NIAS), Tsukuba 305-8634, Japan
| | - Kadis Mujiono
- Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan
- Faculty of Agriculture, Mulawarman University, Samarinda 75119, Indonesia
| | - Yuko Hojo
- Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan
| | - Keisuke Tomita
- Agro-Biotechnology Research Center, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
| | - Kazunori Okada
- Agro-Biotechnology Research Center, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
| | - Takashi Kamakura
- Department of Applied Biological Science, Graduate School of Science and Technology, Tokyo University of Science, Noda 278-8510, Japan
| | - Ivan Galis
- Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan
| | - Masaki Mori
- Institute of Agrobiological Sciences, NARO (NIAS), Tsukuba 305-8634, Japan
- Department of Applied Biological Science, Graduate School of Science and Technology, Tokyo University of Science, Noda 278-8510, Japan
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4
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Shinkado S, Saito H, Yamazaki M, Kotera S, Arazoe T, Arie T, Kamakura T. Genome editing using a versatile vector-based CRISPR/Cas9 system in Fusarium species. Sci Rep 2022; 12:16243. [PMID: 36171473 PMCID: PMC9519947 DOI: 10.1038/s41598-022-20697-4] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 09/16/2022] [Indexed: 11/30/2022] Open
Abstract
Fusarium species include important filamentous fungal pathogens that can infect plants, animals, and humans. Meanwhile, some nonpathogenic Fusarium species are promising biocontrol agents against plant pathogens. Here, we developed a genome editing technology using a vector-based CRISPR/Cas9 system for Fusarium oxysporum f. sp. lycopersici (Fol). This optimized CRISPR/Cas9 system, harboring an endogenous U6 small nuclear RNA promoter for the expression of single-guide RNA and an endogenous H2B nuclear localization signal for the localization of Cas9, enabled efficient targeted gene knock-out, including in the accessory chromosomal regions in Fol. We further demonstrated single crossover-mediated targeted base editing and endogenous gene tagging. This system was also applicable for genome editing in F. oxysporum f. sp. spinaciae and F. commune without any modifications, suggesting that this CRISPR/Cas9 vector has a potential application for a broad range of researches on other Fusarium species.
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Affiliation(s)
- Sota Shinkado
- Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Hiroki Saito
- United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology (TUAT), 3-5-8 Saiwai-cho, Fuchu, Tokyo, 183-0054, Japan
- Graduate School of Biological Science, Nara Institute of Science and Technology, 8916-5 Takayama-cho, Ikoma, Nara, 630-0192, Japan
| | - Masaya Yamazaki
- Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Shunsuke Kotera
- United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology (TUAT), 3-5-8 Saiwai-cho, Fuchu, Tokyo, 183-0054, Japan
| | - Takayuki Arazoe
- Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan.
| | - Tsutomu Arie
- Faculty of Agriculture, Institute of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo, 183-0054, Japan.
| | - Takashi Kamakura
- Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan.
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5
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Bustin A, Sridi S, Kamakura T, Jais P, Stuber M, Cochet H. Free-breathing joint bright- and black-blood cardiovascular magnetic resonance imaging for the improved visualization of ablation-related radiofrequency lesions in the left ventricle. Europace 2022. [DOI: 10.1093/europace/euac053.594] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: Public Institution(s). Main funding source(s): This research was supported by funding from the French National Research Agency under grant agreements Equipex MUSIC ANR-11-EQPX-0030, ANR-21-CE17-0034-01 and Programme d’Investissements d’Avenir ANR-10-IAHU04-LIRYC, and from the European Council under grant agreement ERC n715093. AB acknowledges a Lefoulon-Delalande Foundation fellowship administered by the Institute of France.
Background
Bright-blood late gadolinium-enhanced (LGE) cardiovascular magnetic resonance (CMR) imaging can identify the sites that were ablated during prior ablation procedures (1). However, myocardial lesions visualization is often impaired by the poor contrast at the blood-scar interface on conventional bright-blood-LGE images.
Purpose
To assess the performance of a novel joint bright- and black-blood LGE (SPOT) technique to visualize myocardial lesions post ablation.
Methods
Three sheep (age 2 years, body weight 51.6 kg) underwent radiofrequency ablation at multiple endocardial and epicardial sites. The animals were imaged 3 months later on a 1.5-T CMR scanner using conventional post-contrast bright-blood LGE (PSIR) (1) and the proposed SPOT (2) sequences. The SPOT sequence sampled the data to simultaneously generate a black-blood image (for scar visualization) and a bright-blood image (for scar localization) in a free-breathing 2-dimensional multi-slice scan (2). A coloured representation of myocardial scarring was then generated through image fusion. A reader graded the relative scar-to-myocardium, scar-to-blood, and blood-to-myocardium contrasts and the presence of LGE on all datasets.
Results
Compared with the reference bright-blood LGE images, the average scar-to-myocardium relative contrast in the SPOT images significantly increased by 102.5% to 8.1±4.4 (P<0.01). Similarly, a significant increase in scar-to-blood relative contrast (0.4±0.6 vs. 7.6±4.9, P<0.01) was observed. Owing to the nulling of both blood and normal myocardium signal, a significant decrease in blood-to-myocardium relative contrast (2.5±1.8 vs. 0.2±0.4, P<0.01) was observed with SPOT. A total of 7 and 12 lesions could be identified on conventional bright-blood LGE and proposed SPOT images, respectively (Figure).
Conclusion
The higher scar-to-blood relative contrast with SPOT imaging enables the improved visualization of myocardial lesions post radiofrequency ablation. SPOT offers a promising technology for the non-invasive assessment of myocardial injuries post ablation.
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Affiliation(s)
- A Bustin
- University of Bordeaux, IHU LIRYC, Electrophysiology and Heart Modeling Institute, INSERM U1045, Bordeaux, France
| | - S Sridi
- Hospital Haut Leveque, Department of Cardiovascular Imaging, Bordeaux, France
| | - T Kamakura
- Hospital Haut Leveque, Department of Cardiac Pacing and Electrophysiology, Bordeaux, France
| | - P Jais
- Hospital Haut Leveque, Department of Cardiac Pacing and Electrophysiology, Bordeaux, France
| | - M Stuber
- University Hospital of Lausanne, Department of Diagnostic and Interventional Radiology, Lausanne, Switzerland
| | - H Cochet
- University of Bordeaux, IHU LIRYC, Electrophysiology and Heart Modeling Institute, INSERM U1045, Bordeaux, France
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Motoyama T, Ishii T, Kamakura T, Osada H. Screening of tenuazonic acid production-inducing compounds and identification of NPD938 as a regulator of fungal secondary metabolism. Biosci Biotechnol Biochem 2021; 85:2200-2208. [PMID: 34379730 DOI: 10.1093/bbb/zbab143] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 08/05/2021] [Indexed: 11/12/2022]
Abstract
The control of secondary metabolism in fungi is essential for the regulation of various cellular functions. In this study, we searched the RIKEN Natural Products Depository (NPDepo) chemical library for inducers of tenuazonic acid (TeA) production in the rice blast fungus Pyricularia oryzae and identified NPD938. NPD938 transcriptionally induced TeA production. We explored the mode of action of NPD938 and observed that this compound enhanced TeA production via LAE1, a global regulator of fungal secondary metabolism. NPD938 could also induce production of terpendoles and pyridoxatins in Tolypocladium album RK99-F33. Terpendole production was induced transcriptionally. We identified the pyridoxatin biosynthetic gene cluster among transcriptionally induced secondary metabolite biosynthetic gene clusters. Therefore, NPD938 is useful for the control of fungal secondary metabolism.
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Affiliation(s)
| | - Tomoaki Ishii
- Chemical Biology Research Group, RIKEN CSRS, Wako, Saitama, Japan.,Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba, Japan
| | - Takashi Kamakura
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba, Japan
| | - Hiroyuki Osada
- Chemical Biology Research Group, RIKEN CSRS, Wako, Saitama, Japan
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7
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Furuyama Y, Motoyama T, Nogawa T, Kamakura T, Osada H. Dihydropyriculol produced by Pyricularia oryzae inhibits the growth of Streptomyces griseus. Biosci Biotechnol Biochem 2021; 85:1290-1293. [DOI: 10.1093/bbb/zbab021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 02/04/2021] [Indexed: 11/13/2022]
Abstract
ABSTRACT
Dihydropyriculol is a major secondary metabolite of Pyricularia oryzae. However, the biological activity of dihydropyriculol has not been reported. Here, we showed that dihydropyriculol has inhibitory activity against Streptomyces griseus. Localization analysis of dihydropyriculol revealed that dihydropyriculol could reach to S. griseus under confrontation culture. These results suggest that dihydropyriculol can be used as a chemical weapon against S. griseus.
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Affiliation(s)
- Yuuki Furuyama
- Chemical Biology Research Group, RIKEN CSRS, Wako, Saitama, Japan
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba, Japan
| | | | - Toshihiko Nogawa
- Chemical Biology Research Group, RIKEN CSRS, Wako, Saitama, Japan
| | - Takashi Kamakura
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba, Japan
| | - Hiroyuki Osada
- Chemical Biology Research Group, RIKEN CSRS, Wako, Saitama, Japan
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8
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Furuyama Y, Motoyama T, Nogawa T, Hayashi T, Hirota H, Kiyota H, Kamakura T, Osada H. Controlling the production of phytotoxin pyriculol in Pyricularia oryzae by aldehyde reductase. Biosci Biotechnol Biochem 2021; 85:126-133. [DOI: 10.1093/bbb/zbaa035] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Accepted: 09/01/2020] [Indexed: 01/09/2023]
Abstract
Abstract
Pyricularia oryzae is one of the most devastating plant pathogens in the world. This fungus produces several secondary metabolites including the phytotoxin pyriculols, which are classified into 2 types: aldehyde form (pyriculol and pyriculariol) and alcohol form (dihydropyriculol and dihydropyriculariol). Although interconversion between the aldehyde form and alcohol form has been predicted, and the PYC10 gene for the oxidation of alcohol form to aldehyde is known, the gene responsible for the reduction of aldehyde to alcohol form is unknown. Furthermore, previous studies have predicted that alcohol analogs are biosynthesized via aldehyde analogs. Herein, we demonstrated that an aldo/keto reductase PYC7 is responsible for the reduction of aldehyde to alcohol congeners. The results indicate that aldehyde analogs are biosynthesized via alcohol analogs, contradicting the previous prediction. The results suggest that P. oryzae controls the amount of pyriculol analogs using two oxidoreductases, PYC7 and PYC10, thereby controlling the bioactivity of the phytotoxin.
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Affiliation(s)
- Yuuki Furuyama
- Chemical Biology Research Group, RIKEN CSRS, Wako, Saitama, Japan
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba, Japan
| | | | - Toshihiko Nogawa
- Chemical Biology Research Group, RIKEN CSRS, Wako, Saitama, Japan
| | - Toshiaki Hayashi
- Chemical Biology Research Group, RIKEN CSRS, Wako, Saitama, Japan
| | - Hiroshi Hirota
- Chemical Biology Research Group, RIKEN CSRS, Wako, Saitama, Japan
| | - Hiromasa Kiyota
- Graduate School of Environmental and Life Science, Okayama University, Okayama, Okayama, Japan
| | - Takashi Kamakura
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba, Japan
| | - Hiroyuki Osada
- Chemical Biology Research Group, RIKEN CSRS, Wako, Saitama, Japan
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9
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Kamada H, Ishibashi K, Nakajima K, Ueda N, Kamakura T, Wada M, Yamagata K, Inoue Y, Miyamoto K, Nagase S, Noda T, Aiba T, Isobe M, Terasaki F, Kusano K. Cardiac function at diagnosis is important prognostic factor in patients with cardiac sarcoidosis -from Japanese nationwide questionnaire survey-. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.2130] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Sarcoidosis is a systemic non-caseating granulomatous disease of unknown etiology. Cardiac involvement (cardiac sarcoidosis, CS) has been reported to be an important prognostic factor in this disease because of heart failure and/or ventricular arrhythmia, and corticosteroid therapy is usually prescribed to prevent cardiac events. However, little is known about the relationship of cardiac function and concomitant corticosteroid therapy on later cardiac events in CS.
Objective
We evaluated the relationship between prognosis and left ventricular ejection fraction (LVEF) at the time of diagnosis in CS patients from the Japanese nationwide questionnaire survey.
Methods
Total of 757 Japanese patients from 57 hospitals who diagnosed CS were examined. Patients who unsatisfied the criteria of the Japanese new guidelines, or who underwent cardiac transplantations were excluded, and 420 patients (287 females, mean age 60±13 years old, median follow-up periods 1864 days [interquartile range: 845–3159 days]) were analyzed. The relationship of adverse events (all-cause death, cardiovascular death, and appropriate ICD [Implantable Cardioverter Defibrillator] discharge) and LVEF (with corticosteroid 84%) (low LVEF: LVEF≤35% n=98 [with corticosteroid in 78%], moderate LVEF: LVEF 35–50% n=104 [with corticosteroid in 93%], normal LVEF: 50≤LVEF n=218 [with corticosteroid in 83%]) were evaluated respectively.
Results
89 CS patients developed all-cause death (n=50), cardiovascular death (n=30) or appropriate ICD discharge (n=48). The frequency of corticosteroid therapy was not different in the each LVEF group, but Kaplan-Meier analysis revealed that all-cause death, cardiovascular death, and all cardiovascular adverse events were more observed in lower LVEF group (log-rank p<0.0001). Furthermore, multivariate Cox hazard analysis revealed that LVEF was a most important independent prognostic factor in CS.
Conclusion
This Japanese nationwide questionnaire survey data showed that initial LVEF was an independent and strong prognostic predictor in CS, therefore primary prevention would be needed even after starting corticosteroid in patients with decreased cardiac function.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- H Kamada
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Ishibashi
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Nakajima
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - N Ueda
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - T Kamakura
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - M Wada
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Yamagata
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - Y Inoue
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Miyamoto
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - S Nagase
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - T Noda
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - T Aiba
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - M Isobe
- Tokyo Medical and Dental University, Tokyo, Japan
| | | | - K Kusano
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
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10
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Takagi M, Shinohara T, Kamakura T, Sekiguchi Y, Yokoyama Y, Aihara N, Hiraoka M, Aonuma K. Long-term prognosis in patients with non-type 1 Brugada ECG: results from a large Japanese cohort of Brugada syndrome. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0736] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Most recent consensus conference report recommends Brugada syndrome (BrS) is diagnosed in patients with ST segment elevation with spontaneous, drug-induced or fever-induced type 1 morphology. Prognosis in patients with type 2 or 3 ECG without drug-induced or fever-induced type 1 ECG is still unknown.
Purpose
To evaluate a long-term prognosis in patients with non-type 1 Brugada ECG in a large Japanese cohort of BrS (The Japan Idiopathic Ventricular Fibrillation Study [J-IVFS]).
Methods
From 528 patients in J-IVFS, a total of 28 consecutive non-type 1 patients (54±14 years, all male, previous sustained ventricular tachyarrhythmias (VTs) 1, syncope 11, asymptomatic 16) were enrolled. Cardiac events (CI: sudden cardiac death or VTs) during the follow-up period were evaluated, and risk factors for the cardiac events were assessed.
Results
During a mean follow-up period of 111±91 months (median 134 months), 4 patients experienced cardiac events (1.5%/yr), who all had received implantable cardioverter defibrillator implantation. There was no statistically significant clinical risk factor for cardiac events. However, the incidences of cardiac events tended to be higher in symptomatic patients (CI: 25.0, non-CI: 6.3%, p=0.17), those with wide QRS duration >90 msec in lead V2 (CI: 30.0, non-CI: 6.3%, p=0.11), and those with inducible VTs (CI: 21.1, non-CI: 0%, p=0.20), as determined by the Kaplan-Meier method. The annual incidences of cardiac events in patients with symptom, wide QRS duration >90msec in lead V2, or inducible VTs were 2.8, 3.5, and 2.0%/yr, respectively. The incidences of cardiac events were significantly higher in patients with all these 3 factors (9.9%/yr) than those without (p=0.01).
Conclusions
Our large-scaled multicentre study revealed long-term prognosis in patients with non-type 1 Brugada ECG. The combination of symptom, wide QRS duration in lead V2, and inducible VTs may be useful to evaluate risk for cardiac events. The patients with all these parameters showed high risk for cardiac events and need to be carefully followed.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- M Takagi
- Kansai Medical University, Moriguchi, Japan
| | - T Shinohara
- Oita University Faculty of Medicine, Oita, Japan
| | - T Kamakura
- National Cerebral & Cardiovascular Center, Suita, Japan
| | | | - Y Yokoyama
- St. Luke's International Hospital, Cardiology, Tokyo, Japan
| | - N Aihara
- Senri central hospital, Suita, Japan
| | - M Hiraoka
- Tokyo Medical and Dental University, Cardiology, Tokyo, Japan
| | - K Aonuma
- University of Tsukuba, Tsukuba, Japan
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11
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Kamada H, Ishibashi K, Nakajima K, Ueda N, Kamakura T, Wada M, Yamagata K, Inoue Y, Miyamoto K, Nagase S, Noda T, Aiba T, Isobe M, Terasaki F, Kusano K. Long time clinical course of cardiac sarcoidosis with corticosteroid therapy -from Japanese nationwide questionnaire survey-. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.2109] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Sarcoidosis is a systemic inflammatory syndrome of unknown etiology and cardiac involvement has been reported to be an important prognostic factor in this disease. An autopsy study has reported that the frequency of this cardiac involvement (cardiac sarcoidosis: CS) varies in the different countries and races and very frequent in Japanese patients. We therefore performed the nationwide questionnaire survey and try to clarify the clinical characteristics and corticosteroid effect in CS, especially focused on arrhythmic events in this disease.
Methods
Total of 757 Japanese patients from 57 hospitals who diagnosed CS were examined. Patients who unsatisfied the criteria of the Japanese new guidelines, or who underwent cardiac transplantations were excluded, and 420 patients (287 females, median follow-up periods 1864 days [interquartile range: 845–3159 days]) were analyzed. The clinical outcome and corticosteroid effect were evaluated.
Results
Clinical characteristics at diagnosis was as follows: female dominant (68%), mean age of 60±13 years old, mean left ventricular ejection fraction was 49±16%. Arrhythmic events were very frequently observed as an initial cardiac manifestation in 263 patients (62%) of CS, of which atrioventricular block (AVB) in 174 (41%), ventricular tachycardia (VT) in 73 (17%) and AVB with VT in 17 (4%) (Figure 1A). Pacemaker was implanted in 166 patients (40%) and defibrillators was 137 patients (33%). Corticosteroid was prescribed in 144 (83%) of 174 patients with AVB and in 62 (85%) of 73 patients with VT. Initial dose was mean 47.9 mg and maintenance dose of mean 7.3 mg. Corticosteroid improved VT as good as AVB (27% vs. 29%). However, corticosteroid sometimes worsened VT events compared with AVB (10% vs. 2%) (Figure 1B). During the course of follow-up, 32 patients were needed to increase corticosteroid in 23 of AVB and 10 of VT cases. However, there were no difference in mortality between the groups, whether or not to increase corticosteroid. All survival rate was 92% (5-year mortality), 83% (10-year mortality) and free from all cause death and defibrillator charge was 81% (5 year), 71% (10 year).
Conclusion
Fatal arrhythmia is commonly observed in CS as a primary symptom. Corticosteroid sometimes worsen ventricular arrhythmia and appropriate defibrillator discharge was common. Thus, careful attention for activating ventricular arrhythmia would be needed during the follow-up period even after corticosteroid therapy.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- H Kamada
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Ishibashi
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Nakajima
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - N Ueda
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - T Kamakura
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - M Wada
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Yamagata
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - Y Inoue
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Miyamoto
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - S Nagase
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - T Noda
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - T Aiba
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - M Isobe
- Tokyo Medical and Dental University, Tokyo, Japan
| | | | - K Kusano
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
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12
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Kamada H, Ishibashi K, Nakajima K, Ueda N, Kamakura T, Wada M, Yamagata K, Inoue Y, Miyamoto K, Nagase S, Noda T, Aiba T, Isobe M, Terasaki F, Kusano K. Long-term follow up ventricular tachycardia patients with preserved cardiac function -from Japanese cardiac sarcoidosis nationwide questionnaire survey-. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.2128] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Prior ventricular tachycardia (VT) and low left ventricular ejection fraction (LVEF) are the most important prognostic factors in cardiac sarcoidosis (CS). Recently diagnosis of CS was renewed according to Japanese new guidelines. Patients with preserved cardiac function often have VT events, thus new guidelines recommends to assess the implantable cardioverter defibrillator (ICD) implantation for CS patients with preserved LVEF (35%≤LVEF<50%). However, the long-term prognosis of CS patients with preserved LVEF is unclear.
Objective
In CS patients with preserved LVEF, we evaluated the prognosis between VT manifestation and non-VT manifestation groups at CS diagnosis from Japanese nationwide questionnaire survey.
Methods
Total of 757 Japanese patients from 57 hospitals who diagnosed CS were examined. Patients who unsatisfied the criteria of the Japanese new guidelines, who had LVEF≤35%, LVEF>50%, or who underwent cardiac transplantations were excluded. 104 patients with LVEF 35–50% (67 females, mean age 60±15 years old, median follow-up periods 2134 days [interquartile range: 758–2935 days]) were analyzed. The prognosis between VT manifestation and non-VT manifestation groups at CS diagnosis were evaluated.
Results
30 patients had VT manifestation at CS diagnosis and 24 patients (80%) received ICDs. 74 patients had no VT manifestation at CS diagnosis and 19 patients (44%) received ICDs during follow up period. All-cause mortality was not different between two groups (Figure). Appropriate ICD therapy of non-VT manifestation group was significantly lower compared with that of VT manifestation group (log-rank p=0.001), however considerable number (n=7, 15%) of non-VT manifestation group had appropriate ICD therapy event during follow-up period. Cox hazard analysis revealed that concomitant non-sustained VT (NSVT) with atrioventricular block (AVB) was a predictor of appropriate ICD therapy in non-VT manifestation group.
Conclusion
This nationwide survey showed that considerable number of CS patients with preserved LVEF had VT events, independent of VT manifestation. Concomitant NSVT with AVB was a predictor of VT events, and ICD implantation should be assessed.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- H Kamada
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Ishibashi
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Nakajima
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - N Ueda
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - T Kamakura
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - M Wada
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Yamagata
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - Y Inoue
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Miyamoto
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - S Nagase
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - T Noda
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - T Aiba
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - M Isobe
- Tokyo Medical and Dental University, Tokyo, Japan
| | | | - K Kusano
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
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13
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Tonegawa R, Miyamoto K, Ueda N, Nakajima K, Kamakura T, Yamagata K, Wada M, Ishibashi K, Inoue Y, Noda T, Nagase S, Aiba T, Kusano K. Micro-embolic risks during radiofrequency and cryoballoon-ablation of atrial fibrillation -analysis from real-time carotid artery doppler monitoring-. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0486] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Catheter ablation of atrial fibrillation (AF) is associated with risks of silent cerebral events. However, the timing of intraprocedural micro-embolic events or differences between open-irrigated radiofrequency (RF) and cryoballoon (Cryo) ablation are unclear. Newly developed real-time carotid artery Doppler is a simple non-invasive method to detect micro-embolic signals (MESs) during ablation.
Objective
We investigated the timing of detecting MESs during RF and Cryo ablation of AF.
Methods
During the first pulmonary vein isolation (PVI) session of AF, MESs were monitored by real-time carotid artery Doppler monitoring throughout the procedure. The MES counts were collected and evaluated separately during the different steps of the procedure (Figure).
Results
Thirty-three AF patients (RF/Cryo: 22/11 cases, 9 females, 69.5±11.6 y.o) were included. PVI was successfully accomplished in all patients with no major complications. The MES count was significantly greater in the RF group than Cryo group (table). In both groups, left atrial (LA) access (interatrial puncture) and sheaths insertion to the LA generated a significant number of MESs (RF: 1690 of 9116 MESs [18.5% of the total MESs], Cryo: 793 of 2285 MESs [34.7%]). In the RF group, MESs were observed incessantly during PVI (Figure). The LA dwell time was significantly longer in the RF group than Cryo group (table). In the RF group, the MES count was significantly greater in the longer LA dwell time group (LA dwell time >130min) than the shorter group (464.2±179.7 vs 302.6±138.2: P=0.049). During the cryo-applications in the Cryo group, the MESs were greatest during the first cryoballoon application (625 of 2285 MESs [27.4%]).
Conclusions
There were more MESs during RF ablation than cryoablation. MESs were recorded during a variety of steps throughout the procedure. In the RF group, most of MESs were recorded incessantly during radiofrequency ablation and greater number of MESs were recorded in patients with longer LA dwell time. In the Cryo group, most of MESs occurred during phases with a high probability of gaseous emboli.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- R Tonegawa
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Kumamoto University, Department of Advanced Cardiovascular Medicine, Kumamoto, Japan
| | - K Miyamoto
- National Cerebral & Cardiovascular Center, Division of arrhythmia, Department of Cardiovascular Medicine, Suita, Japan
| | - N Ueda
- National Cerebral & Cardiovascular Center, Division of arrhythmia, Department of Cardiovascular Medicine, Suita, Japan
| | - K Nakajima
- National Cerebral & Cardiovascular Center, Division of arrhythmia, Department of Cardiovascular Medicine, Suita, Japan
| | - T Kamakura
- National Cerebral & Cardiovascular Center, Division of arrhythmia, Department of Cardiovascular Medicine, Suita, Japan
| | - K Yamagata
- National Cerebral & Cardiovascular Center, Division of arrhythmia, Department of Cardiovascular Medicine, Suita, Japan
| | - M Wada
- National Cerebral & Cardiovascular Center, Division of arrhythmia, Department of Cardiovascular Medicine, Suita, Japan
| | - K Ishibashi
- National Cerebral & Cardiovascular Center, Division of arrhythmia, Department of Cardiovascular Medicine, Suita, Japan
| | - Y Inoue
- National Cerebral & Cardiovascular Center, Division of arrhythmia, Department of Cardiovascular Medicine, Suita, Japan
| | - T Noda
- National Cerebral & Cardiovascular Center, Division of arrhythmia, Department of Cardiovascular Medicine, Suita, Japan
| | - S Nagase
- National Cerebral & Cardiovascular Center, Division of arrhythmia, Department of Cardiovascular Medicine, Suita, Japan
| | - T Aiba
- National Cerebral & Cardiovascular Center, Division of arrhythmia, Department of Cardiovascular Medicine, Suita, Japan
| | - K.F Kusano
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Kumamoto University, Department of Advanced Cardiovascular Medicine, Kumamoto, Japan
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14
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Yokoyama Y, Miyamoto K, Nakai M, Sumita Y, Ueda N, Nakajima K, Kamakura T, Wada M, Yamagata K, Ishibashi K, Inoue Y, Nagase S, Noda T, Aiba T, Kusano K. The safety of catheter ablation of atrial fibrillation in elderly patients -analysis of the nationwide database in Japan, JROAD-DPC-. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0613] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
“Age” is one of the major concerns and determinants of the indications for catheter ablation (CA) of atrial fibrillation (AF). There are little safety data on CA of AF according to the age. This study aimed to assess the safety of CA in elderly patients undergoing CA of AF.
Methods and results
We investigated the complication rate of CA of AF for the different age groups (<60 years, 60–65, 65–70, 70–75, 75–80, 80–85, and ≥85) by a nationwide database (Japanese Registry Of All cardiac and vascular Diseases [JROAD]-DPC). The JROAD-DPC included 73,296 patients (65±11 years, 52,883 men) who underwent CA of AF from 516 hospitals in Japan. Aged patients had more comorbidities and a significantly increased CHADS2 score and higher rate of female according to a higher age. The overall complication rate was 2.6% and in-hospital mortality was 0.05%. By comparing each age group, complications occurred more frequently in higher aged groups. A multivariate adjusted hazard ratio revealed an increased age was independently and significantly associated with the overall complications (odds ratio was 1.25, 1.35, 1.72, 1.86, 2.76 and 3.13 respectively; reference <60 years).
Conclusions
The frequency of complications was significantly higher according to a higher age. We should take note of the indications and procedure for CA of AF in aged patients.
Funding Acknowledgement
Type of funding source: Public Institution(s). Main funding source(s): Intramural Research Fund 17 (Kusano) for Cardiovascular Diseases of the National Cerebral and Cardiovascular Center
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Affiliation(s)
- Y Yokoyama
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Miyamoto
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - M Nakai
- National Cerebral and Cardiovascular Center Hospital, Center for Cerebral and Cardiovascular Disease Information, Osaka, Japan
| | - Y Sumita
- National Cerebral and Cardiovascular Center Hospital, Center for Cerebral and Cardiovascular Disease Information, Osaka, Japan
| | - N Ueda
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Nakajima
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - T Kamakura
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - M Wada
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Yamagata
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Ishibashi
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - Y Inoue
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - S Nagase
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - T Noda
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - T Aiba
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Kusano
- National Cerebral & Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
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15
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Kanda Y, Nishizawa Y, Kamakura T, Mori M. Overexpressed BSR1-Mediated Enhancement of Disease Resistance Depends on the MAMP-Recognition System. Int J Mol Sci 2020; 21:ijms21155397. [PMID: 32751339 PMCID: PMC7432911 DOI: 10.3390/ijms21155397] [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] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 07/22/2020] [Accepted: 07/26/2020] [Indexed: 11/16/2022] Open
Abstract
Plant plasma membrane-localized receptors recognize microbe-associated molecular patterns (MAMPs) and activate immune responses via various signaling pathways. Receptor-like cytoplasmic kinases (RLCKs) are considered key signaling factors in plant immunity. BROAD-SPECTRUM RESISTANCE 1 (BSR1), a rice RLCK, plays a significant role in disease resistance. Overexpression of BSR1 confers strong resistance against fungal and bacterial pathogens. Our recent study revealed that MAMP-triggered immune responses are mediated by BSR1 in wild-type rice and are hyperactivated in BSR1-overexpressing rice. It was suggested that hyperactivated immune responses were responsible for the enhancement of broad-spectrum disease resistance; however, this remained to be experimentally validated. In this study, we verified the above hypothesis by disrupting the MAMP-recognition system in BSR1-overexpressing rice. To this end, we knocked out OsCERK1, which encodes a well-characterized MAMP-receptor-like protein kinase. In the background of BSR1 overaccumulation, the knockout of OsCERK1 nearly abolished the enhancement of blast resistance. This finding indicates that overexpressed BSR1-mediated enhancement of disease resistance depends on the MAMP-triggered immune system, corroborating our previously suggested model.
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Affiliation(s)
- Yasukazu Kanda
- Institute of Agrobiological Sciences, NARO (NIAS), Tsukuba 305-8602, Japan; (Y.K.); (Y.N.)
- Department of Applied Biological Science, Graduate School of Science and Technology, Tokyo University of Science, Noda 278-8510, Japan;
| | - Yoko Nishizawa
- Institute of Agrobiological Sciences, NARO (NIAS), Tsukuba 305-8602, Japan; (Y.K.); (Y.N.)
| | - Takashi Kamakura
- Department of Applied Biological Science, Graduate School of Science and Technology, Tokyo University of Science, Noda 278-8510, Japan;
| | - Masaki Mori
- Institute of Agrobiological Sciences, NARO (NIAS), Tsukuba 305-8602, Japan; (Y.K.); (Y.N.)
- Department of Applied Biological Science, Graduate School of Science and Technology, Tokyo University of Science, Noda 278-8510, Japan;
- Correspondence: ; Tel.: +81-29-838-7008
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16
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Kato S, Motoyama T, Futamura Y, Uramoto M, Nogawa T, Hayashi T, Hirota H, Tanaka A, Takahashi-Ando N, Kamakura T, Osada H. Biosynthetic gene cluster identification and biological activity of lucilactaene from Fusarium sp. RK97-94. Biosci Biotechnol Biochem 2020; 84:1303-1307. [PMID: 32043422 DOI: 10.1080/09168451.2020.1725419] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
We identified the biosynthetic gene cluster for lucilactaene, a cell cycle inhibitor from a filamentous fungus Fusarium sp. RK 97-94. The luc1 knockout strain accumulated demethylated analogs, indicating the involvement of Luc1 methyltransferase in lucilactaene biosynthesis. Lucilactaene showed potent antimalarial activity. Our data suggested that methylation and ether ring formation are essential for its potent antimalarial activity.
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Affiliation(s)
- Sho Kato
- Chemical Biology Research Group, RIKEN CSRS, Wako, Saitama, Japan.,Graduate School of Science and Engineering, Saitama University, Sakura, Saitama, Japan
| | | | - Yushi Futamura
- Chemical Biology Research Group, RIKEN CSRS, Wako, Saitama, Japan
| | - Masakazu Uramoto
- Chemical Biology Research Group, RIKEN CSRS, Wako, Saitama, Japan
| | - Toshihiko Nogawa
- Chemical Biology Research Group, RIKEN CSRS, Wako, Saitama, Japan
| | - Toshiaki Hayashi
- Chemical Biology Research Group, RIKEN CSRS, Wako, Saitama, Japan
| | - Hiroshi Hirota
- Chemical Biology Research Group, RIKEN CSRS, Wako, Saitama, Japan
| | - Akira Tanaka
- Chemical Biology Research Group, RIKEN CSRS, Wako, Saitama, Japan.,Graduate School of Science and Engineering, Toyo University, Kawagoe, Saitama, Japan
| | - Naoko Takahashi-Ando
- Graduate School of Science and Engineering, Toyo University, Kawagoe, Saitama, Japan.,Graduate School of Engineering, Toyo University, Kawagoe, Saitama, Japan
| | - Takashi Kamakura
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba, Japan
| | - Hiroyuki Osada
- Chemical Biology Research Group, RIKEN CSRS, Wako, Saitama, Japan.,Graduate School of Science and Engineering, Saitama University, Sakura, Saitama, Japan
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17
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Mizumoto A, Amano M, Kamakura T, Hashimoto S, Oonishi E, Tanaka N, Izumi C. P1742 Occurrence of right ventricle dysfunction in patients with Brugada syndrome: a follow-up study by echocardiography and electrophysiological examination. Eur Heart J Cardiovasc Imaging 2020. [DOI: 10.1093/ehjci/jez319.1102] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Brugada syndrome (BrS) has been characterized by no apparent structural abnormalities in both ventricles, but, recently, the presence of subtle right ventricular (RV) structural abnormalities in patients with BrS has been reported.
Purpose
The aim of this study was to evaluate the occurrence of RV dysfunction in patients with BrS and their characteristics.
Methods
We enrolled 49 consecutive patients (54 ± 11 years old) diagnosed with Brs and underwent echocardiography from 2017 to 2018. The echocardiographic parameters and electrophysiological examinations were evaluated including RV size and function such as RV outflow and inflow tract diameter, TAPSE, S’, and FAC. Abnormality threshold for parameters of RV dysfunction is defined as followed: a TAPSE of <17 mm, an S’ of <9.5 cm, and an FAC of <35%.
Results
Among 49 patients, one patient showed a TAPSE of <17 mm, 5 patients an S’ of <9.5 cm, and 10 patients an FAC of <35%. Evaluating characteristics of Brs patients with RV dysfunction, all patients were divided into 2 groups by the value of RV FAC; 39 patients showing FAC >35% (group A), 10 patients FAC ≤35% (group B). The comparison of each parameter between 2 groups is shown in Table. TAPSE and S’ in group B were lower than in group A. RV inflow tract diameter in group B was larger than in group A, although there was no differences in RV out tract diameter. There were no significant differences in left ventricular parameters, and grade of tricuspid regurgitation. QRS duration prolonged and the rate of ICD implantation was higher in group B than in group A. Moreover, all patients in group B showed RV wall motion abnormalities and the distribution was as followed: diffuse (n = 2), RV mid (n = 2), RV apex (n = 6).
Conclusions
BrS patients frequently showed RV dysfunction during follow-up, and it may be related to the prolongation of QRS duration. We should pay much attention to the occurrence of RV dysfunction in follow-up echocardiography.
Group A (FAC >35%) N = 39 Group B (FAC ≤35%) N = 10 p-value TAPSE, mm 22.9 ± 2.1 20.4 ± 2.6 0.009 S", cm/s 12.8 ± 2.0 11.1 ± 1.4 0.010 RV outflow tract, mm 29.7 ± 4.4 31.2 ± 5.0 0.49 RV mid inflow tract, mm 30.4 ± 2.9 33.8 ± 3.7 0.008 RV basal inflow tract, mm 38.5 ± 3.2 43.7 ± 4.0 0.001 QRS duration, ms 112.9 ± 12.9 136.3 ± 28.4 0.006 Late potential positive, n (%) 25 (64) 8 (80) 0.34 ICD implantation, n (%) 19 (68) 9 (90) 0.019
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Affiliation(s)
- A Mizumoto
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - M Amano
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - T Kamakura
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - S Hashimoto
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - E Oonishi
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - N Tanaka
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - C Izumi
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
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18
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Kuroki M, Shiga Y, Narukawa-Nara M, Arazoe T, Kamakura T. Extremely Low Concentrations of Acetic Acid Stimulate Cell Differentiation in Rice Blast Fungus. iScience 2019; 23:100786. [PMID: 31901638 PMCID: PMC6941858 DOI: 10.1016/j.isci.2019.100786] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 09/12/2019] [Accepted: 12/13/2019] [Indexed: 01/19/2023] Open
Abstract
Metabolic switching and rewiring play a dynamic role in programmed cell differentiation. Many pathogenic microbes need to survive in nutrient-deficient conditions and use the glyoxylate cycle, an anaplerotic pathway of the tricarboxylic acid cycle, to produce carbohydrates. The plant pathogenic fungus Magnaporthe oryzae (Pyricularia oryzae) has a unique chitin deacetylase, Cbp1. The spatiotemporal activity of this protein is required for modification of the M. oryzae wall and for cell differentiation into the specialized infection structure (appressorium). Here we show that acetic acid, another product released by the Cbp1-catalyzed conversion of chitin into chitosan, induces appressorium formation. An extremely low concentration (fM) of acetic acid restored cell differentiation in a Δcbp1 mutant possibly through the glyoxylate cycle. Acidification occurred by chitin deacetylase activity during cell differentiation Extremely low concentrations of exogenous acetic acid stimulated cell differentiation Exogenous acetic acid induced ICL1 expression, a member of the glyoxylate cycle Deletion of ICL1 inhibited acetic acid-mediated cell differentiation
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Affiliation(s)
- Misa Kuroki
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba 278-8510, Japan
| | - Yuriko Shiga
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba 278-8510, Japan
| | - Megumi Narukawa-Nara
- Osaka University, Research Institute for Microbial Diseases, Department of Molecular Microbiology, 3-1 Yamadaoka, Suita, Osaka 565-0871 Japan
| | - Takayuki Arazoe
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba 278-8510, Japan
| | - Takashi Kamakura
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba 278-8510, Japan.
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19
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Kanda Y, Nakagawa H, Nishizawa Y, Kamakura T, Mori M. Broad-Spectrum Disease Resistance Conferred by the Overexpression of Rice RLCK BSR1 Results from an Enhanced Immune Response to Multiple MAMPs. Int J Mol Sci 2019; 20:ijms20225523. [PMID: 31698708 PMCID: PMC6888047 DOI: 10.3390/ijms20225523] [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] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 10/31/2019] [Accepted: 11/04/2019] [Indexed: 02/07/2023] Open
Abstract
Plants activate their immune system through intracellular signaling pathways after perceiving microbe-associated molecular patterns (MAMPs). Receptor-like cytoplasmic kinases mediate the intracellular signaling downstream of pattern-recognition receptors. BROAD-SPECTRUM RESISTANCE 1 (BSR1), a rice (Oryza sativa) receptor-like cytoplasmic kinase subfamily-VII protein, contributes to chitin-triggered immune responses. It is valuable for agriculture because its overexpression confers strong disease resistance to fungal and bacterial pathogens. However, it remains unclear how overexpressed BSR1 reinforces plant immunity. Here we analyzed immune responses using rice suspension-cultured cells and sliced leaf blades overexpressing BSR1. BSR1 overexpression enhances MAMP-triggered production of hydrogen peroxide (H2O2) and transcriptional activation of the defense-related gene in cultured cells and leaf strips. Furthermore, the co-cultivation of leaves with conidia of the blast fungus revealed that BSR1 overexpression allowed host plants to produce detectable oxidative bursts against compatible pathogens. BSR1 was also involved in the immune responses triggered by peptidoglycan and lipopolysaccharide. Thus, we concluded that the hyperactivation of MAMP-triggered immune responses confers BSR1-mediated robust resistance to broad-spectrum pathogens.
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Affiliation(s)
- Yasukazu Kanda
- Institute of Agrobiological Sciences, NARO (NIAS), Tsukuba 305-8602, Japan; (Y.K.); (H.N.); (Y.N.)
- Graduate School of Science and Technology, Tokyo University of Science, Noda 278-8510, Japan;
| | - Hitoshi Nakagawa
- Institute of Agrobiological Sciences, NARO (NIAS), Tsukuba 305-8602, Japan; (Y.K.); (H.N.); (Y.N.)
| | - Yoko Nishizawa
- Institute of Agrobiological Sciences, NARO (NIAS), Tsukuba 305-8602, Japan; (Y.K.); (H.N.); (Y.N.)
| | - Takashi Kamakura
- Graduate School of Science and Technology, Tokyo University of Science, Noda 278-8510, Japan;
| | - Masaki Mori
- Institute of Agrobiological Sciences, NARO (NIAS), Tsukuba 305-8602, Japan; (Y.K.); (H.N.); (Y.N.)
- Graduate School of Science and Technology, Tokyo University of Science, Noda 278-8510, Japan;
- Correspondence: ; Tel.: +81-29-838-7008
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20
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Kamakura T, Nakajima K, Kataoka N, Wada M, Yamagata K, Ishibashi K, Inoue Y, Miyamoto K, Nagase S, Noda T, Aiba T, Yasuda S, Kusano K. P5655Efficacy of new-generation atrial antitachycardia pacing for atrial tachyarrhythmias in patients with left ventricular dysfunction. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0598] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
The progression to persistent atrial fibrillation (AF) is associated with a worse clinical outcome in patients with previous atrial tachyarrhythmias. New-generation atrial antitachycardia pacing (ATP) (Reactive ATP) reduced the progression to persistent AF in patients with pacemaker and preserved left ventricular (LV) function. However, little is known about the efficacy of Reactive ATP in patients with cardiac implantable electronic devices (CIED) and LV dysfunction.
Purpose
We aimed to investigate the efficacy of Reactive ATP for atrial tachyarrhythmias in patients with LV dysfunction (LV ejection fraction [LVEF] <40%).
Methods
This study included 423 patients with CIED and previous atrial tachyarrthythmias. Reactive ATP was programmed in 284 patients (ATP group) and 139 were implanted with a dual-chamber device without ATP function (control group). The differences in the success rate of ATP and incidence of progression to persistent AF (≥7 days) between the ATP and control groups were evaluated in 108 patients with LVEF <40% (reduced LVEF) and 315 with LVEF ≥40% (preserved LVEF). Patients with persistent AF were excluded from this study.
Results
During 710±337 days of follow-up period, 16 patients (15%) with reduced LVEF and 51 (16%) with preserved LVEF progressed to persistent AF (p=0.88). The mean ATP success rate was lower in patients with reduced LVEF than in those with preserved LVEF, although not statistically significant (reduced LVEF: 27.2±19.4% and preserved LVEF: 35.1±29.2%, p=0.12). The incidence of progression to persistent AF was significantly lower in the ATP group than in the control group both in patients with reduced and preserved LVEF (log-rank, reduced LVEF: p=0.0070 and preserved LVEF: p<0.0001) (Figure). Multivariate analysis showed that use of Reactive ATP and smaller left atrium were associated with lower incidences of persistent AF, while LVEF was not predictive of progression to persistent AF (Reactive ATP: hazard ratio [HR] 0.28, 95% confidence interval [CI] 0.17–0.46, p<0.0001, left atrium diameter: HR 1.03, 95% CI 1.00–1.07, p=0.030).
Figure 1
Conclusions
Reactive ATP was effective in preventing AF progression in patients with LV dysfunction.
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Affiliation(s)
- T Kamakura
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Nakajima
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - N Kataoka
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - M Wada
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Yamagata
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Ishibashi
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - Y Inoue
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Miyamoto
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - S Nagase
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - T Noda
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - T Aiba
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - S Yasuda
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
| | - K Kusano
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Suita, Japan
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21
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Takagi M, Kamakura T, Shinohara T, Sekiguchi Y, Yokoyama Y, Aihara N, Hiraoka M, Aonuma K. P5029Inducibility of ventricular tachyarrhythmias by up to two extrastimuli does not predict future cardiac events in asymptomatic Brugada patients: results from long-term follow-up. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0207] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Most recent consensus conference report recommends Implantable Cardioverter Defibrillator (ICD) implantation for asymptomatic Brugada patients with spontaneous or fever-induced type-1 ECG (A-BrS) and inducible ventricular tachyarrhythmias (VTs) by up to two extrastimuli as class IIb indication. However, the validity of the inducible VTs by up to two extrastimuli in A-BrS is still unknown.
Purpose
To evaluate the validity of the inducibility by up to two extrastimuli in A-BrS in a large Japanese cohort of BrS (The Japan Idiopathic Ventricular Fibrillation Study [J-IVFS]).
Methods
A total of 193 consecutive A-BrS patients performed programmed electrical stimulation (PES) with non-aggressive uniform protocol (mean age 50±13 years, 180 males) were enrolled. PES protocol was using 2 basic pacing cycles and the order of introduction of up to 2 ventricular extra-stimuli from right ventricular apex [RVA] first, then right ventricular outflow tract [RVOT], 3 ventricular extra-stimuli from RVA then RVOT down to the minimum of 200ms. Clinical outcomes during the follow-up period were compared between A-BrS patients with and without inducible VTs by up to two extrastimuli.
Results
Thirty-five A-BrS (18%) had inducible VTs by up to two extrastimuli. During a mean follow-up period of 101±48 months, 7 A-BrS experienced cardiac events (sudden cardiac death [SCD] or VTs, 0.4%/yr). None of the 7 A-BrS had inducible VTs by up to two extrastimuli. The incidences of cardiac events tended to be higher in A-BrS without inducible VTs by up to two extrastimuli than in those with inducible VTs (p=0.10), as determined by the Kaplan-Meier method. In the A-BrS, the annual incidences of cardiac events in A-BrS with family history of SCD, inferolateral J wave, wide QRS duration >90msec in lead V2, or inducible VT/VF by 3 extrastimuli were 0.7, 0.7, 0.6, and 0.3%/yr, respectively.
Conclusions
Our large-scaled multicentre study with long-term follow-up revealed the inducibility of ventricular tachyarrhythmias by up to two extrastimuli does not predict future cardiac events in A-BrS, even using non-aggressive uniform protocol. Rather, other parameters such as family history of SCD or inferolateral J wave might be helpful for risk assessment in A-BrS.
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Affiliation(s)
- M Takagi
- Kansai Medical University, Moriguchi, Japan
| | - T Kamakura
- National Cerebral and Cardiovascular Center, Osaka, Japan
| | | | | | - Y Yokoyama
- St. Luke's International Hospital, Cardiology, Tokyo, Japan
| | - N Aihara
- Senri central hospital, Suita, Japan
| | - M Hiraoka
- Tokyo Medical and Dental University, Tokyo, Japan
| | - K Aonuma
- University of Tsukuba, Tsukuba, Japan
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22
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Tanabe Y, Arai S, Wada I, Adachi H, Kamakura T, Yoda K, Noda Y. Svp26 facilitates ER exit of mannosyltransferases Mnt2 and Mnt3 in Saccharomyces cerevisiae. J GEN APPL MICROBIOL 2019; 65:180-187. [PMID: 30700649 DOI: 10.2323/jgam.2018.09.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
After being translocated into the ER lumen, membrane and secretory proteins are transported from the ER to the early Golgi by COPII vesicles. Incorporation of these cargo proteins into COPII vesicles are facilitated either by direct interaction of cargo proteins with COPII coat proteins or by ER exit adaptor proteins which mediate the interaction of cargo proteins with COPII coat proteins. Svp26 is one of the ER exit adaptor proteins in yeast Saccharomyces cerevisiae. ER exit of several type II membrane proteins have been reported to be facilitated by Svp26. We demonstrate here that efficient incorporation of Mnt2 and Mnt3 into COPII vesicles is also dependent on the function of Svp26. Mnt2 and Mnt3 are Golgi-localized α-1,3-mannosyltransferases with type II membrane topology involved in protein O-glycosylation. Immunoisolation of the yeast Golgi subcompartments quantitatively showed that Mnt2 and Mnt3 are more abundant in the early Golgi fraction than in the late Golgi fraction. Subcellular fractionation and fluorescence microscopy showed that deletion of the SVP26 gene results in the accumulation of Mnt2 and Mnt3 in ER. Using an in vitro COPII vesicle formation assay, we further demonstrate that Svp26 facilitates incorporation of Mnt2 and Mnt3 into COPII vesicles. Finally, we showed that Mnt2 and Mnt3 were co-immunoprecipitated with Svp26 from digitonin-solubilized membranes. These results indicate that Svp26 functions as an ER exit adaptor protein of Mnt2 and Mnt3.
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Affiliation(s)
- Yuuki Tanabe
- Department of Biotechnology, The University of Tokyo.,Department of Applied Biological Science, Tokyo University of Science
| | - Seisuke Arai
- Department of Cell Science, Institute of Biomedical Sciences, Fukushima Medical University School of Medicine
| | - Ikuo Wada
- Department of Cell Science, Institute of Biomedical Sciences, Fukushima Medical University School of Medicine
| | - Hiroyuki Adachi
- Department of Biotechnology, The University of Tokyo.,Collaborative Research Institute for Innovative Microbiology, The University of Tokyo
| | - Takashi Kamakura
- Department of Applied Biological Science, Tokyo University of Science
| | - Koji Yoda
- Department of Biotechnology, The University of Tokyo
| | - Yoichi Noda
- Department of Biotechnology, The University of Tokyo.,Collaborative Research Institute for Innovative Microbiology, The University of Tokyo
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23
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Nozaka A, Nishiwaki A, Nagashima Y, Endo S, Kuroki M, Nakajima M, Narukawa M, Kamisuki S, Arazoe T, Taguchi H, Sugawara F, Kamakura T. Chloramphenicol inhibits eukaryotic Ser/Thr phosphatase and infection-specific cell differentiation in the rice blast fungus. Sci Rep 2019; 9:9283. [PMID: 31243315 PMCID: PMC6594944 DOI: 10.1038/s41598-019-41039-x] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Accepted: 02/25/2019] [Indexed: 01/23/2023] Open
Abstract
Chloramphenicol (Cm) is a broad-spectrum classic antibiotic active against prokaryotic organisms. However, Cm has severe side effects in eukaryotes of which the cause remains unknown. The plant pathogenic fungus Magnaporthe oryzae, which causes rice blast, forms an appressorium to infect the host cell via single-cell differentiation. Chloramphenicol specifically inhibits appressorium formation, which indicates that Cm has a novel molecular target (or targets) in the rice blast fungus. Application of the T7 phage display method inferred that MoDullard, a Ser/Thr-protein phosphatase, may be a target of Cm. In animals Dullard functions in cell differentiation and protein synthesis, but in fungi its role is poorly understood. In vivo and in vitro analyses showed that MoDullard is required for appressorium formation, and that Cm can bind to and inhibit MoDullard function. Given that human phosphatase CTDSP1 complemented the MoDullard function during appressorium formation by M. oryzae, CTDSP1 may be a novel molecular target of Cm in eukaryotes.
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Affiliation(s)
- Akihito Nozaka
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Ayaka Nishiwaki
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Yuka Nagashima
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Shogo Endo
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Misa Kuroki
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Masahiro Nakajima
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Megumi Narukawa
- Osaka University, Research Institute for Microbial Diseases, Department of Molecular Microbiology, 3-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Shinji Kamisuki
- Azabu University, Department of Veterinary Science, Laboratory of Basic Education, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara-shi, Kanagawa, 252-5201, Japan
| | - Takayuki Arazoe
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Hayao Taguchi
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Fumio Sugawara
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Takashi Kamakura
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan.
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24
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Yamato T, Handa A, Arazoe T, Kuroki M, Nozaka A, Kamakura T, Ohsato S, Arie T, Kuwata S. Single crossover-mediated targeted nucleotide substitution and knock-in strategies with CRISPR/Cas9 system in the rice blast fungus. Sci Rep 2019; 9:7427. [PMID: 31092866 PMCID: PMC6520371 DOI: 10.1038/s41598-019-43913-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [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: 01/24/2019] [Accepted: 05/01/2019] [Indexed: 01/10/2023] Open
Abstract
Clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated protein 9 (Cas9)-mediated genome editing has become a promising approach for efficient and versatile genetic engineering in various organisms; however, simple and precise nucleotide modification methods in filamentous fungi have been restricted to double crossover type homologous recombination (HR). In this study, we developed a novel genome editing strategy via single crossover-mediated HR in the model filamentous fungus Pyricularia (Magnaporthe) oryzae. This method includes the CRISPR/Cas9 system and a donor vector harboring a single homology arm with point mutations at the CRISPR/Cas9 cleavage site. Using this strategy, we demonstrated highly efficient and freely programmable base substitutions within the desired genomic locus, and target gene disrupted mutants were also obtained via a shortened (100-1000 bp) single homology arm. We further demonstrated that this method allowed a one-step GFP gene knock-in at the C-terminus of the targeted gene. Since the genomic recombination does not require an intact protospacer-adjacent motif within the donor construct and any additional modifications of host components, this method can be used in various filamentous fungi for CRISPR/Cas9-based basic and applied biological analyses.
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Affiliation(s)
- Tohru Yamato
- Graduate School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, Kanagawa, 214-8571, Japan
| | - Ai Handa
- Graduate School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, Kanagawa, 214-8571, Japan
| | - Takayuki Arazoe
- Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan.
| | - Misa Kuroki
- Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Akihito Nozaka
- Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Takashi Kamakura
- Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Shuichi Ohsato
- Graduate School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, Kanagawa, 214-8571, Japan
| | - Tsutomu Arie
- Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo, 183-0509, Japan
| | - Shigeru Kuwata
- Graduate School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, Kanagawa, 214-8571, Japan.
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25
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Tanaka N, Nakajima M, Narukawa-Nara M, Matsunaga H, Kamisuki S, Aramasa H, Takahashi Y, Sugimoto N, Abe K, Terada T, Miyanaga A, Yamashita T, Sugawara F, Kamakura T, Komba S, Nakai H, Taguchi H. Identification, characterization, and structural analyses of a fungal endo-β-1,2-glucanase reveal a new glycoside hydrolase family. J Biol Chem 2019; 294:7942-7965. [PMID: 30926603 DOI: 10.1074/jbc.ra118.007087] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 03/20/2019] [Indexed: 11/06/2022] Open
Abstract
endo-β-1,2-Glucanase (SGL) is an enzyme that hydrolyzes β-1,2-glucans, which play important physiological roles in some bacteria as a cyclic form. To date, no eukaryotic SGL has been identified. We purified an SGL from Talaromyces funiculosus (TfSGL), a soil fungus, to homogeneity and then cloned the complementary DNA encoding the enzyme. TfSGL shows no significant sequence similarity to any known glycoside hydrolase (GH) families, but shows significant similarity to certain eukaryotic proteins with unknown functions. The recombinant TfSGL (TfSGLr) specifically hydrolyzed linear and cyclic β-1,2-glucans to sophorose (Glc-β-1,2-Glc) as a main product. TfSGLr hydrolyzed reducing-end-modified β-1,2-gluco-oligosaccharides to release a sophoroside with the modified moiety. These results indicate that TfSGL is an endo-type enzyme that preferably releases sophorose from the reducing end of substrates. Stereochemical analysis demonstrated that TfSGL is an inverting enzyme. The overall structure of TfSGLr includes an (α/α)6 toroid fold. The substrate-binding mode was revealed by the structure of a Michaelis complex of an inactive TfSGLr mutant with a β-1,2-glucoheptasaccharide. Mutational analysis and action pattern analysis of β-1,2-gluco-oligosaccharide derivatives revealed an unprecedented catalytic mechanism for substrate hydrolysis. Glu-262 (general acid) indirectly protonates the anomeric oxygen at subsite -1 via the 3-hydroxy group of the Glc moiety at subsite +2, and Asp-446 (general base) activates the nucleophilic water via another water. TfSGLr is apparently different from a GH144 SGL in the reaction and substrate recognition mechanism based on structural comparison. Overall, we propose that TfSGL and closely-related enzymes can be classified into a new family, GH162.
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Affiliation(s)
- Nobukiyo Tanaka
- From the Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510
| | - Masahiro Nakajima
- From the Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510,
| | - Megumi Narukawa-Nara
- From the Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510
| | - Hiroki Matsunaga
- From the Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510
| | - Shinji Kamisuki
- From the Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510.,the School of Veterinary Medicine, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5201
| | - Hiroki Aramasa
- the Faculty of Agriculture, Niigata University, Niigata 950-2181
| | - Yuta Takahashi
- the Faculty of Agriculture, Niigata University, Niigata 950-2181
| | - Naohisa Sugimoto
- the Faculty of Agriculture, Niigata University, Niigata 950-2181
| | - Koichi Abe
- From the Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510.,the Agricultural Bioinformatics Research Unit, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657
| | - Tohru Terada
- the Agricultural Bioinformatics Research Unit, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657
| | - Akimasa Miyanaga
- the Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8551
| | | | - Fumio Sugawara
- From the Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510
| | - Takashi Kamakura
- From the Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510
| | - Shiro Komba
- the Food Component Analysis Unit, Food Research Institute, National Agriculture and Food Research Organization, 2-1-12, Kannondai, Tsukuba, Ibaraki 305-8642, Japan
| | - Hiroyuki Nakai
- the Faculty of Agriculture, Niigata University, Niigata 950-2181
| | - Hayao Taguchi
- From the Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510
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26
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Wada M, Kamakura T, Yamagata K, Ishibashi K, Inoue Y, Miyamoto K, Nagase S, Noda T, Aiba T, Kusano K. P3217Relationship between conductor externalization and electrical malfunction in recalled and non-recalled implantable defibrillator leads. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.p3217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- M Wada
- National Cerebral and Cardiovascular Center, Osaka, Japan
| | - T Kamakura
- National Cerebral and Cardiovascular Center, Osaka, Japan
| | - K Yamagata
- National Cerebral and Cardiovascular Center, Osaka, Japan
| | - K Ishibashi
- National Cerebral and Cardiovascular Center, Osaka, Japan
| | - Y Inoue
- National Cerebral and Cardiovascular Center, Osaka, Japan
| | - K Miyamoto
- National Cerebral and Cardiovascular Center, Osaka, Japan
| | - S Nagase
- National Cerebral and Cardiovascular Center, Osaka, Japan
| | - T Noda
- National Cerebral and Cardiovascular Center, Osaka, Japan
| | - T Aiba
- National Cerebral and Cardiovascular Center, Osaka, Japan
| | - K Kusano
- National Cerebral and Cardiovascular Center, Osaka, Japan
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27
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Takagi M, Kamakura T, Shinohara T, Sekiguchi Y, Yokoyama Y, Aihara N, Hiraoka M, Aonuma K. P2864Validation of the indication for implantable cardioverter defibrillator in Brugada syndrome in the J Wave Syndromes Consensus Conference. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p2864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- M Takagi
- Kansai Medical University, Cardiac Arrhythmia Center, Moriguchi, Japan
| | - T Kamakura
- National Cerebral and Cardiovascular Center, Osaka, Japan
| | | | | | - Y Yokoyama
- St. Luke's International Hospital, Tokyo, Japan
| | - N Aihara
- Senri central hospital, Suita, Japan
| | - M Hiraoka
- Tokyo Medical and Dental University, Tokyo, Japan
| | - K Aonuma
- University of Tsukuba, Tsukuba, Japan
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28
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Korai K, Ishibashi K, Kamakura T, Wada M, Yamagata K, Inoue Y, Miyamoto K, Nagase S, Noda T, Aiba T, Noguchi T, Yasuda S, Kusano K. P5777Clinical outcomes of patient with single-coil vs. dual-coil implantable cardioverter defibrillation lead for secondary prevention. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.p5777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- K Korai
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Osaka, Japan
| | - K Ishibashi
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Osaka, Japan
| | - T Kamakura
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Osaka, Japan
| | - M Wada
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Osaka, Japan
| | - K Yamagata
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Osaka, Japan
| | - Y Inoue
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Osaka, Japan
| | - K Miyamoto
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Osaka, Japan
| | - S Nagase
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Osaka, Japan
| | - T Noda
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Osaka, Japan
| | - T Aiba
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Osaka, Japan
| | - T Noguchi
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Osaka, Japan
| | - S Yasuda
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Osaka, Japan
| | - K Kusano
- National Cerebral and Cardiovascular Center, Department of Cardiovascular Medicine, Osaka, Japan
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29
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Ueda N, Kamakura T, Wada M, Yamagata K, Ishibashi K, Inoue Y, Miyamoto K, Nagase S, Noda T, Aiba T, Izumi C, Noguchi T, Yasuda S, Kusano K. P5740Efficacy and safety of new-generation atrial antitachycardia pacing for atrial tachyarrhythmias in patients implanted with a cardiac resynchronization therapy. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.p5740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- N Ueda
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - T Kamakura
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - M Wada
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - K Yamagata
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - K Ishibashi
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - Y Inoue
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - K Miyamoto
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - S Nagase
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - T Noda
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - T Aiba
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - C Izumi
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - T Noguchi
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - S Yasuda
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - K Kusano
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
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30
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Otuki S, Kamakura T, Wada M, Ishibashi K, Yamagata K, Inoue Y, Miyamoto K, Nagase S, Noda T, Aiba T, Izumi C, Noguchi T, Yasuda S, Kusano K. P1904Comparison of the efficacy of new-generation atrial antitachycardia pacing between patients with sick sinus syndrome and atrioventricular block. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- S Otuki
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - T Kamakura
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - M Wada
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - K Ishibashi
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - K Yamagata
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - Y Inoue
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - K Miyamoto
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - S Nagase
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - T Noda
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - T Aiba
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - C Izumi
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - T Noguchi
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - S Yasuda
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
| | - K Kusano
- National Cerebral and Cardiovascular Center Hospital, Osaka, Japan
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31
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Ueda N, Noda T, Kamakura T, Wada M, Yamagata K, Ishibashi K, Inoue Y, Miyamoto K, Nagase S, Aiba T, Izumi C, Noguchi T, Yasuda S, Kusano K. P1948The efficacy of a new device-based continuous optimization algorithm for mildly wide QRS and non-CLBBB patients with cardiac resynchronization therapy. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- N Ueda
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - T Noda
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - T Kamakura
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - M Wada
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - K Yamagata
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - K Ishibashi
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - Y Inoue
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - K Miyamoto
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - S Nagase
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - T Aiba
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - C Izumi
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - T Noguchi
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - S Yasuda
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
| | - K Kusano
- National Cerebral and Cardiovascular Center Hospital, Department of Cardiovascular Medicine, Osaka, Japan
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32
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Kamisuki S, Himeno N, Tsurukawa Y, Kusayanagi T, Takeno M, Kamakura T, Kuramochi K, Sugawara F. Identification of proteins that bind to the neuroprotective agent neoechinulin A. Biosci Biotechnol Biochem 2018; 82:442-448. [PMID: 29447077 DOI: 10.1080/09168451.2018.1433018] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Neoechinulin A is an indole alkaloid with several biological activities. We previously reported that this compound protects neuronal PC12 cells from cytotoxicity induced by the peroxynitrite generator 3-morpholinosydnonimine (SIN-1), but the target proteins and precise mechanism of action of neoechinulin A were unclear. Here, we employed a phage display screen to identify proteins that bind directly with neoechinulin A. Our findings identified two proteins, chromogranin B and glutaredoxin 3, as candidate target binding partners for the alkaloid. QCM analyses revealed that neoechinulin A displays high affinity for both chromogranin B and glutaredoxin 3. RNA interference-mediated depletion of chromogranin B decreased the sensitivity of PC12 cells against SIN-1. Our results suggested chromogranin B is a plausible target of neoechinulin A.
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Affiliation(s)
- Shinji Kamisuki
- a School of Veterinary Medicine , Azabu University , Kanagawa , Japan
| | - Natsumi Himeno
- b Department of Applied Biological Science , Tokyo University of Science , Chiba , Japan
| | - Yukine Tsurukawa
- a School of Veterinary Medicine , Azabu University , Kanagawa , Japan
| | - Tomoe Kusayanagi
- b Department of Applied Biological Science , Tokyo University of Science , Chiba , Japan
| | - Masahiro Takeno
- b Department of Applied Biological Science , Tokyo University of Science , Chiba , Japan
| | - Takashi Kamakura
- b Department of Applied Biological Science , Tokyo University of Science , Chiba , Japan
| | - Kouji Kuramochi
- b Department of Applied Biological Science , Tokyo University of Science , Chiba , Japan
| | - Fumio Sugawara
- b Department of Applied Biological Science , Tokyo University of Science , Chiba , Japan
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33
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Kamakura T, Sakamoto M, Odaka T, Nose Y, Akazawa K. Patient Registration and Treatment Allocation in Multicenter Clinical Trials Using a FAX-OCR System. Methods Inf Med 2018. [DOI: 10.1055/s-0038-1635059] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Abstract:This article describes the design and results of implementation of an automated patient registration and freatment allocation system (RETAS) used in multicenter clinical trials. RETAS was developed using a FAX-OCR system by which handwritten Japanese and English characters, as well as numericals and forms with check boxes, are sent from participating institutions by Fax, processed using an optical character reader, and then transmitted to a host computer at a statistical center. Based on the facsimile data, RETAS can automatically review eligibility, collect patient identification data and provide a randomized treatment allocation. RETAS permits uninterrupted, unattended operation at a statistical center, 24 hours a day, 7 days a week. Therefore, it drastically decreases the workload of personnel at the statistical center needed to support central telephone registration coverage. Consequently, staff members are free to focus on patient registration, treatment allocation, and follow-up of patients. The treatment allocation procedure in this system is based on Pocock and Simon’s minimization method combined with Zelen’s method for institution balancing. By this system it was possible to balance treatment numbers for each level of various prognostic factors over an entire trial and, at the same time, balance the allocation of treatments within an institution. The system currently supports the protocol of a clinical trial for Adjuvant Chemo-Endocrine Therapy for Breast Cancer in West Japan.
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34
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Maeda K, Izawa M, Nakajima Y, Jin Q, Hirose T, Nakamura T, Koshino H, Kanamaru K, Ohsato S, Kamakura T, Kobayashi T, Yoshida M, Kimura M. Increased metabolite production by deletion of an HDA1-type histone deacetylase in the phytopathogenic fungi, Magnaporthe oryzae (Pyricularia oryzae) and Fusarium asiaticum. Lett Appl Microbiol 2017; 65:446-452. [PMID: 28862744 DOI: 10.1111/lam.12797] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Revised: 08/10/2017] [Accepted: 08/27/2017] [Indexed: 11/29/2022]
Abstract
Histone deacetylases (HDACs) play an important role in the regulation of chromatin structure and gene expression. We found that dark pigmentation of Magnaporthe oryzae (anamorph Pyricularia oryzae) ΔMohda1, a mutant strain in which an orthologue of the yeast HDA1 was disrupted by double cross-over homologous recombination, was significantly stimulated in liquid culture. Analysis of metabolites in a ΔMohda1 mutant culture revealed that the accumulation of shunt products of the 1,8-dihydroxynaphthalene melanin and ergosterol pathways were significantly enhanced compared to the wild-type strain. Northern blot analysis of the ΔMohda1 mutant revealed transcriptional activation of three melanin genes that are dispersed throughout the genome of M. oryzae. The effect of deletion of the yeast HDA1 orthologue was also observed in Fusarium asiaticum from the Fusarium graminearum species complex; the HDF2 deletion mutant produced increased levels of nivalenol-type trichothecenes. These results suggest that histone modification via HDA1-type HDAC regulates the production of natural products in filamentous fungi. SIGNIFICANCE AND IMPACT OF THE STUDY Natural products of fungi have significant impacts on human welfare, in both detrimental and beneficial ways. Although HDA1-type histone deacetylase is not essential for vegetative growth, deletion of the gene affects the expression of clustered secondary metabolite genes in some fungi. Here, we report that such phenomena are also observed in physically unlinked genes required for melanin biosynthesis in the rice blast fungus. In addition, production of Fusarium trichothecenes, previously reported to be unaffected by HDA1 deletion, was significantly upregulated in another Fusarium species. Thus, the HDA1-inactivation strategy may be regarded as a general approach for overproduction and/or discovery of fungal metabolites.
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Affiliation(s)
- K Maeda
- Chemical Genetics Laboratory, RIKEN, Wako, Saitama, Japan.,Department of Biological Mechanisms and Function, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Aichi, Japan.,Graduate School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
| | - M Izawa
- Chemical Genetics Laboratory, RIKEN, Wako, Saitama, Japan.,Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba, Japan
| | - Y Nakajima
- Department of Biological Mechanisms and Function, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Aichi, Japan
| | - Q Jin
- Department of Biological Mechanisms and Function, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Aichi, Japan
| | - T Hirose
- Chemical Genetics Laboratory, RIKEN, Wako, Saitama, Japan.,Graduate School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
| | - T Nakamura
- Molecular Structure Characterization Unit, RIKEN Center for Sustainable Resource Science (CSRS), Wako, Saitama, Japan
| | - H Koshino
- Molecular Structure Characterization Unit, RIKEN Center for Sustainable Resource Science (CSRS), Wako, Saitama, Japan
| | - K Kanamaru
- Department of Biological Mechanisms and Function, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Aichi, Japan
| | - S Ohsato
- Graduate School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
| | - T Kamakura
- Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba, Japan
| | - T Kobayashi
- Department of Biological Mechanisms and Function, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Aichi, Japan
| | - M Yoshida
- Chemical Genetics Laboratory, RIKEN, Wako, Saitama, Japan
| | - M Kimura
- Chemical Genetics Laboratory, RIKEN, Wako, Saitama, Japan.,Department of Biological Mechanisms and Function, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Aichi, Japan
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35
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Kuroki M, Okauchi K, Yoshida S, Ohno Y, Murata S, Nakajima Y, Nozaka A, Tanaka N, Nakajima M, Taguchi H, Saitoh KI, Teraoka T, Narukawa M, Kamakura T. Chitin-deacetylase activity induces appressorium differentiation in the rice blast fungus Magnaporthe oryzae. Sci Rep 2017; 7:9697. [PMID: 28852173 PMCID: PMC5575296 DOI: 10.1038/s41598-017-10322-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [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: 06/23/2017] [Accepted: 08/04/2017] [Indexed: 11/09/2022] Open
Abstract
The rice blast fungus Magnaporthe oryzae differentiates a specialized infection structure called an appressorium to invade rice cells. In this report, we show that CBP1, which encodes a chitin-deacetylase, is involved in the induction phase of appressorium differentiation. We demonstrate that the enzymatic activity of Cbp1 is critical for appressorium formation. M. oryzae has six CDA homologues in addition to Cbp1, but none of these are indispensable for appressorium formation. We observed chitosan localization at the fungal cell wall using OGA488. This observation suggests that Cbp1-catalysed conversion of chitin into chitosan occurs at the cell wall of germ tubes during appressorium differentiation by M. oryzae. Taken together, our results provide evidence that the chitin deacetylase activity of Cbp1 is necessary for appressorium formation.
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Affiliation(s)
- Misa Kuroki
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Kana Okauchi
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Sho Yoshida
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Yuko Ohno
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Sayaka Murata
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Yuichi Nakajima
- Nagoya University, Graduate School of Bioagricultural Sciences, School of Agricultural Sciences, Furo-cho, Chikusa, Nagoya, Aichi, 464-8601, Japan
| | - Akihito Nozaka
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Nobukiyo Tanaka
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Masahiro Nakajima
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Hayao Taguchi
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Ken-Ichiro Saitoh
- Tokyo University of Agriculture and Technology, University Research Administration Center, 2-24-16, Naka-cho, Koganei, Tokyo, 184-8588, Japan
| | - Tohru Teraoka
- Tokyo University of Agriculture and Technology, Institute of Symbiotic Science and Technology, 3-5-8, Saiwai-cho, Fuchu, Tokyo, 183-8509, Japan
| | - Megumi Narukawa
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Takashi Kamakura
- Tokyo University of Science, Department of Applied Biological Science, Faculty of Science and Technology, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan.
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36
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Nakasuka K, Ishibashi K, Kamakura T, Wada M, Okamura H, Nagase S, Noda T, Aiba T, Isobe M, Terasaki F, Noguchi T, Anzai T, Yasuda S, Ohte N, Kusano K. P5466Sex difference in the response to cardiac resynchronization therapy in patients with cardiac sarcoidosis: from Japanese multi-center retrospective cohort analysis. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p5466] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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37
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Kanda Y, Yokotani N, Maeda S, Nishizawa Y, Kamakura T, Mori M. The receptor-like cytoplasmic kinase BSR1 mediates chitin-induced defense signaling in rice cells. Biosci Biotechnol Biochem 2017; 81:1497-1502. [PMID: 28521637 DOI: 10.1080/09168451.2017.1325710] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Broad-Spectrum Resistance 1 (BSR1) encodes a rice receptor-like cytoplasmic kinase, and enhances disease resistance when overexpressed. Rice plants overexpressing BSR1 are highly resistant to diverse pathogens, including rice blast fungus. However, the mechanism responsible for this resistance has not been fully characterized. To analyze the BSR1 function, BSR1-knockout (BSR1-KO) plants were generated using a clustered regularly interspaced short palindromic repeat (CRISPR)/CRISPR-associated protein 9 (Cas9) system. Experiments using suspension-cultured cells revealed that defense responses including H2O2 production (i.e. oxidative burst) and expression of defense-related genes induced by autoclaved conidia of the rice blast fungus significantly decreased in BSR1-KO cells. Furthermore, a treatment with chitin oligomers which function as microbe-associated molecular patterns (MAMPs) of the rice blast fungus resulted in considerably suppressed defense responses in BSR1-KO cells. These results suggest that BSR1 is important for the rice innate immunity triggered by the perception of chitin.
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Affiliation(s)
- Yasukazu Kanda
- a Institute of Agrobiological Sciences, NARO (NIAS) , Tsukuba , Japan.,b Graduate School of Science and Technology , Tokyo University of Science , Noda , Japan
| | - Naoki Yokotani
- a Institute of Agrobiological Sciences, NARO (NIAS) , Tsukuba , Japan
| | - Satoru Maeda
- a Institute of Agrobiological Sciences, NARO (NIAS) , Tsukuba , Japan
| | - Yoko Nishizawa
- a Institute of Agrobiological Sciences, NARO (NIAS) , Tsukuba , Japan
| | - Takashi Kamakura
- b Graduate School of Science and Technology , Tokyo University of Science , Noda , Japan
| | - Masaki Mori
- a Institute of Agrobiological Sciences, NARO (NIAS) , Tsukuba , Japan
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38
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Narukawa-Nara M, Nakamura A, Kikuzato K, Kakei Y, Sato A, Mitani Y, Yamasaki-Kokudo Y, Ishii T, Hayashi KI, Asami T, Ogura T, Yoshida S, Fujioka S, Kamakura T, Kawatsu T, Tachikawa M, Soeno K, Shimada Y. Aminooxy-naphthylpropionic acid and its derivatives are inhibitors of auxin biosynthesis targeting l-tryptophan aminotransferase: structure-activity relationships. Plant J 2016; 87:245-57. [PMID: 27147230 DOI: 10.1111/tpj.13197] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [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: 12/11/2015] [Revised: 04/12/2016] [Accepted: 04/15/2016] [Indexed: 05/26/2023]
Abstract
We previously reported l-α-aminooxy-phenylpropionic acid (AOPP) to be an inhibitor of auxin biosynthesis, but its precise molecular target was not identified. In this study we found that AOPP targets TRYPTOPHAN AMINOTRANSFERASE of ARABIDOPSIS 1 (TAA1). We then synthesized 14 novel compounds derived from AOPP to study the structure-activity relationships of TAA1 inhibitors in vitro. The aminooxy and carboxy groups of the compounds were essential for inhibition of TAA1 in vitro. Docking simulation analysis revealed that the inhibitory activity of the compounds was correlated with their binding energy with TAA1. These active compounds reduced the endogenous indole-3-acetic acid (IAA) content upon application to Arabidopsis seedlings. Among the compounds, we selected 2-(aminooxy)-3-(naphthalen-2-yl)propanoic acid (KOK1169/AONP) and analyzed its activities in vitro and in vivo. Arabidopsis seedlings treated with KOK1169 showed typical auxin-deficient phenotypes, which were reversed by exogenous IAA. In vitro and in vivo experiments indicated that KOK1169 is more specific for TAA1 than other enzymes, such as phenylalanine ammonia-lyase. We further tested 41 novel compounds with aminooxy and carboxy groups to which we added protection groups to increase their calculated hydrophobicity. Most of these compounds decreased the endogenous auxin level to a greater degree than the original compounds, and resulted in a maximum reduction of about 90% in the endogenous IAA level in Arabidopsis seedlings. We conclude that the newly developed compounds constitute a class of inhibitors of TAA1. We designated them 'pyruvamine'.
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Affiliation(s)
- Megumi Narukawa-Nara
- Kihara Institute for Biological Research, Yokohama City University, Yokohama, Kanagawa, 244-0813, Japan
| | - Ayako Nakamura
- Kihara Institute for Biological Research, Yokohama City University, Yokohama, Kanagawa, 244-0813, Japan
| | - Ko Kikuzato
- Kihara Institute for Biological Research, Yokohama City University, Yokohama, Kanagawa, 244-0813, Japan
| | - Yusuke Kakei
- Kihara Institute for Biological Research, Yokohama City University, Yokohama, Kanagawa, 244-0813, Japan
| | - Akiko Sato
- Kihara Institute for Biological Research, Yokohama City University, Yokohama, Kanagawa, 244-0813, Japan
| | - Yuka Mitani
- Kihara Institute for Biological Research, Yokohama City University, Yokohama, Kanagawa, 244-0813, Japan
| | - Yumiko Yamasaki-Kokudo
- Western Region Agricultral Reserch Center (WARC), National Agricultural Food Research Organization (NARO), Zentsuji, Kagawa, 765-8508, Japan
| | - Takahiro Ishii
- Western Region Agricultral Reserch Center (WARC), National Agricultural Food Research Organization (NARO), Zentsuji, Kagawa, 765-8508, Japan
| | - Ken-Ichiro Hayashi
- Department of Biochemistry, Okayama University of Science, Okayama, Okayama, 700-0005, Japan
| | - Tadao Asami
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Takehiko Ogura
- RIKEN Plant Science Center, Yokohama, Kanagawa, 230-0045, Japan
| | - Shigeo Yoshida
- Kihara Institute for Biological Research, Yokohama City University, Yokohama, Kanagawa, 244-0813, Japan
- RIKEN Plant Science Center, Yokohama, Kanagawa, 230-0045, Japan
| | - Shozo Fujioka
- RIKEN Plant Science Center, Yokohama, Kanagawa, 230-0045, Japan
- RIKEN, Advanced Science Institute, Wako, Saitama, 351-0198, Japan
| | - Takashi Kamakura
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba, 278-8510, Japan
| | - Tsutomu Kawatsu
- Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa, 236-0027, Japan
- Institute for Molecular Science, National Institutes of Natural Science, 38 Nishigonaka, Myodaiji, Okazaki, Aichi, 444-8585, Japan
| | - Masanori Tachikawa
- Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa, 236-0027, Japan
| | - Kazuo Soeno
- Western Region Agricultral Reserch Center (WARC), National Agricultural Food Research Organization (NARO), Zentsuji, Kagawa, 765-8508, Japan
| | - Yukihisa Shimada
- Kihara Institute for Biological Research, Yokohama City University, Yokohama, Kanagawa, 244-0813, Japan.
- RIKEN Plant Science Center, Yokohama, Kanagawa, 230-0045, Japan.
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Kamakura T, Kobayashi K, Tanaka T, Yamaguchi I, Endō T. Cloning and Expression of a New Structural Gene for Blasticidin S Deaminase, a Nucleoside Aminohydrolase. ACTA ACUST UNITED AC 2016. [DOI: 10.1080/00021369.1987.10868511] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Nakajima Y, Koseki N, Sugiura R, Tominaga N, Maeda K, Tokai T, Izawa M, Kanamaru K, Kamakura T, Kobayashi T, Nishiuchi T, Yoshida M, Kimura M. Effect of disrupting the trichothecene efflux pump encoded by FgTri12 in the nivalenol chemotype of Fusarium graminearum. J GEN APPL MICROBIOL 2016; 61:93-6. [PMID: 26227913 DOI: 10.2323/jgam.61.93] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Yuichi Nakajima
- Department of Biological Mechanisms and Functions, Graduate School of Bioagricultural Sciences, Nagoya University
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Yamamura C, Mizutani E, Okada K, Nakagawa H, Fukushima S, Tanaka A, Maeda S, Kamakura T, Yamane H, Takatsuji H, Mori M. Diterpenoid phytoalexin factor, a bHLH transcription factor, plays a central role in the biosynthesis of diterpenoid phytoalexins in rice. Plant J 2015; 84:1100-13. [PMID: 26506081 DOI: 10.1111/tpj.13065] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [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: 09/21/2015] [Revised: 10/19/2015] [Accepted: 10/21/2015] [Indexed: 05/22/2023]
Abstract
Rice (Oryza sativa) produces diterpenoid phytoalexins (DPs), momilactones and phytocassanes as major phytoalexins. Accumulation of DPs is induced in rice by blast fungus infection, copper chloride or UV light. Here, we describe a rice transcription factor named diterpenoid phytoalexin factor (DPF), which is a basic helix-loop-helix (bHLH) transcription factor. The gene encoding DPF is expressed mainly in roots and panicles, and is inducible in leaves by blast infection, copper chloride or UV. Expression of all DP biosynthetic genes and accumulation of momilactones and phytocassanes were remarkably increased and decreased in DPF over-expressing and DPF knockdown rice, respectively. These results clearly demonstrated that DPF positively regulates DP accumulation via transcriptional regulation of DP biosynthetic genes, and plays a central role in the biosynthesis of DPs in rice. Furthermore, DPF activated the promoters of COPALYL DIPHOSPHATE SYNTHASE2 (CPS2) and CYTOCHROME P450 MONOOXYGENASE 99A2 (CYP99A2), whose products are implicated in the biosynthesis of phytocassanes and momilactones, respectively. Mutations in the N-boxes in the CPS2 upstream region, to which several animal bHLH transcription factors bind, decreased CPS2 transcription, indicating that DPF positively regulates CPS2 transcription through the N-boxes. In addition, DPF partly regulates CYP99A2 through the N-box. This study demonstrates that DPF acts as a master transcription factor in DP biosynthesis.
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Affiliation(s)
- Chihiro Yamamura
- Disease Resistant Crops Research Unit, National Institute of Agrobiological Sciences, Tsukuba, 305-8602, Japan
- Faculty of Science and Technology, Tokyo University of Science, Noda, 278-8510, Japan
| | - Emi Mizutani
- Disease Resistant Crops Research Unit, National Institute of Agrobiological Sciences, Tsukuba, 305-8602, Japan
- Faculty of Science and Technology, Tokyo University of Science, Noda, 278-8510, Japan
| | - Kazunori Okada
- Biotechnology Research Center, The University of Tokyo, Tokyo, 113-8657, Japan
| | - Hitoshi Nakagawa
- Disease Resistant Crops Research Unit, National Institute of Agrobiological Sciences, Tsukuba, 305-8602, Japan
| | - Setsuko Fukushima
- Disease Resistant Crops Research Unit, National Institute of Agrobiological Sciences, Tsukuba, 305-8602, Japan
| | - Atsunori Tanaka
- Disease Resistant Crops Research Unit, National Institute of Agrobiological Sciences, Tsukuba, 305-8602, Japan
- Faculty of Science and Technology, Tokyo University of Science, Noda, 278-8510, Japan
| | - Satoru Maeda
- Disease Resistant Crops Research Unit, National Institute of Agrobiological Sciences, Tsukuba, 305-8602, Japan
| | - Takashi Kamakura
- Faculty of Science and Technology, Tokyo University of Science, Noda, 278-8510, Japan
| | - Hisakazu Yamane
- Department of Biosciences, Teikyo University, Utsunomiya, 320-8551, Japan
| | - Hiroshi Takatsuji
- Disease Resistant Crops Research Unit, National Institute of Agrobiological Sciences, Tsukuba, 305-8602, Japan
| | - Masaki Mori
- Disease Resistant Crops Research Unit, National Institute of Agrobiological Sciences, Tsukuba, 305-8602, Japan
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Narukawa-Nara M, Sasaki K, Ishii A, Baba K, Amano K, Kuroki M, Saitoh KI, Kamakura T. Identification and characterization of a novel gene encoding the NBS1 protein in Pyricularia oryzae. Biosci Biotechnol Biochem 2015; 79:1183-90. [PMID: 25774746 DOI: 10.1080/09168451.2015.1015951] [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] [Indexed: 10/23/2022]
Abstract
The ascomycete Pyricularia oryzae (teleomorph: Magnaporthe oryzae) causes one of the most serious diseases known as rice blast. The Nijmegen breakage syndrome protein (NBS1) is essential for DNA repair; thus, we studied the P. oryzae NBS1 homolog (PoNBS1). A PoNBS1 null mutant exhibited high sensitivity to DNA damage-inducing agents. The mutant also exhibited the retarded hyphal growth, and induced abnormal conidial germination and shape, but showed normal appressorium formation. The phenotypes of the null mutant were complemented by introducing the cDNA of PoNBS1 driven by a TrpC promoter of Aspergillus nidulans. In addition, the null mutant similarly complemented with the PoNBS1 cDNA lacking the FHA domain that had a normal phenotype except for hyphal growth. These results suggest that PoNBS1 is involved in DNA repair and normal development in P. oryzae. Moreover, the FHA domain of PoNBS1 participates in normal hyphal growth.
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Affiliation(s)
- Megumi Narukawa-Nara
- a Department of Applied Biological Science, Faculty of Science and Technology , Tokyo University of Science , Noda , Japan
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Nakajima Y, Saitoh KI, Arie T, Teraoka T, Kamakura T. Expression specificity of CBP1 is regulated by transcriptional repression during vegetative growth of Magnaporthe oryzae. J GEN APPL MICROBIOL 2011; 56:437-45. [PMID: 21282899 DOI: 10.2323/jgam.56.437] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The rice blast fungus Magnaporthe oryzae produces appressoria during the infection of a host. In M. oryzae, the appressorium formation-related gene CBP1 (Chitin Binding Protein 1) is specifically expressed during the early stage of appressorium differentiation. The transcription factor CON7 activates CBP1 expression. However, many aspects of the regulation of CBP1 expression are still unknown. In this report, the CBP1 5' upstream region was analyzed using an egfp reporter. Deletion of the CBP1 5 ' upstream region caused derepression of reporter gene activity during vegetative growth. This result suggests that CBP1 expression is repressed during vegetative growth. The key 5 ' upstream sequences for CBP1 repression were examined. Furthermore, cis- and trans-acting elements of the negative regulatory region were investigated. Here, we discuss the transcriptional regulatory mechanism of CBP1.
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Affiliation(s)
- Yuichi Nakajima
- Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba, Japan
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Maekawa C, Kitahara T, Kizawa K, Okazaki S, Kamakura T, Horii A, Imai T, Doi K, Inohara H, Kiyama H. Expression and translocation of aquaporin-2 in the endolymphatic sac in patients with Meniere's disease. J Neuroendocrinol 2010; 22:1157-64. [PMID: 20722976 DOI: 10.1111/j.1365-2826.2010.02060.x] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Meniere's disease, characterised by episodic vertigo, fluctuating hearing loss and tinnitus, can occur under conditions of stress. Its pathology was first revealed to be inner ear hydrops through temporal bone studies in 1938. Although its pathogenesis has been proposed to be a disorder of water transport in the inner ear, subsequently, it remains unsolved, until now. A recent study revealed that both plasma stress hormone, vasopressin (pAVP) and its receptor, V2 (V2R) expression in the inner ear endolymphatic sac were significantly higher in Meniere's patients. In the present study, to link V2R-related molecules and inner ear hydrops, we examined V2R-linked water channel molecule, aquaporin-2 (AQP2) expression and translocation in human endolymphatic sac. AQP2 mRNA expression in the endolymphatic sac was significantly higher in Meniere's patients by using real-time polymerase chain reaction, as further confirmed by western blotting. AQP2-like immunoreactivity (-LIR) was translocated from luminal to basolateral side with endosomal trapping in the endolymphatic sac at the time of AVP exposure in human endolymphatic sac tissue culture. The similar AQP2-LIR translocation was also demonstrated by forskolin and blocked by vasopressin/V2R specific antagonist, OPC31260 and protein kinase A (PKA) specific antagonists, H-89 and KT-5720. We concluded that in the pathogenesis of inner ear hydrops resulting in Meniere's attacks, pAVP elevation as a result of stress and subsequent V2R-cAMP-PKA-AQP2 activation and endosomal trapping of AQP2 in the endolymphatic sac, might be important as a basis of this disease. Further experimental and clinical studies are needed to better clarify the neuroscientific relationship between stress and Meniere's disease.
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Affiliation(s)
- C Maekawa
- Department of Otolaryngology, Osaka University, School of Medicine, Suita-city, Osaka, Japan
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Nakamura SI, Kamakura T, Ookura T. Tongue epithelial KT-1 cell-cycle arrest by TGF-beta associated with induction of p21(Cip1) and p15 (Ink4b). Cytotechnology 2010; 61:109-16. [PMID: 20094776 DOI: 10.1007/s10616-010-9251-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2009] [Accepted: 01/07/2010] [Indexed: 11/28/2022] Open
Abstract
Tongue epithelium continuously turns over in adults. Our previous study showed that epidermal growth factor and fibroblast growth factor-2 stimulated proliferation of KT-1 cells derived from tongue epithelium, suggesting that these signals serve as positive regulators for tongue epithelial proliferation. To investigate a negative regulation of tongue epithelial cell proliferation, we studied effects of transforming growth factor-beta (TGF-beta) on KT-1 cells. Proliferation assays showed that TGF-beta inhibited proliferation of KT-1 cells in a dose dependent manner. Cell-cycle analysis showed that TGF-beta induced G(0)/G(1) cell cycle arrest in KT-1 cells. We also examined expressions of Ink4 and Cip/Kip family mRNA by quantitative reverse transcription-polymerase chain reaction. We found that TGF-beta induced p15(Ink4b) and p21(Cip1) mRNA expressions. These results strongly suggest that G(0)/G(1) cell cycle arrest is associated with increased p15(Ink4b) and p21(Cip1) expressions. Moreover, p21(Cip1) mRNA was localized in suprabasal cells of tongue epithelium, suggesting that p21(Cip1) play a role in cell-cycle exit along with tongue epithelial differentiation. Taken together, our results suggest that TGF-beta signaling serves as negative regulator of tongue epithelial cell proliferation, and may control tongue epithelial cell differentiation through modulating expression of p21(Cip1).
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Affiliation(s)
- Shin-Ichi Nakamura
- Food Function Division, National Food Research Institute, National Agriculture and Food Research Organization, Kannondai 2-1-12, Tsukuba, 305-8642, Ibaraki, Japan
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Tanaka A, Nakagawa H, Tomita C, Shimatani Z, Ohtake M, Nomura T, Jiang CJ, Dubouzet JG, Kikuchi S, Sekimoto H, Yokota T, Asami T, Kamakura T, Mori M. BRASSINOSTEROID UPREGULATED1, encoding a helix-loop-helix protein, is a novel gene involved in brassinosteroid signaling and controls bending of the lamina joint in rice. Plant Physiol 2009; 151:669-80. [PMID: 19648232 PMCID: PMC2754635 DOI: 10.1104/pp.109.140806] [Citation(s) in RCA: 146] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Brassinosteroids (BRs) are involved in many developmental processes and regulate many subsets of downstream genes throughout the plant kingdom. However, little is known about the BR signal transduction and response network in monocots. To identify novel BR-related genes in rice (Oryza sativa), we monitored the transcriptomic response of the brassinosteroid deficient1 (brd1) mutant, with a defective BR biosynthetic gene, to brassinolide treatment. Here, we describe a novel BR-induced rice gene BRASSINOSTEROID UPREGULATED1 (BU1), encoding a helix-loop-helix protein. Rice plants overexpressing BU1 (BU1:OX) showed enhanced bending of the lamina joint, increased grain size, and resistance to brassinazole, an inhibitor of BR biosynthesis. In contrast to BU1:OX, RNAi plants designed to repress both BU1 and its homologs displayed erect leaves. In addition, compared to the wild type, the induction of BU1 by exogenous brassinolide did not require de novo protein synthesis and it was weaker in a BR receptor mutant OsbriI (Oryza sativa brassinosteroid insensitive1, d61) and a rice G protein alpha subunit (RGA1) mutant d1. These results indicate that BU1 protein is a positive regulator of BR response: it controls bending of the lamina joint in rice and it is a novel primary response gene that participates in two BR signaling pathways through OsBRI1 and RGA1. Furthermore, expression analyses showed that BU1 is expressed in several organs including lamina joint, phloem, and epithelial cells in embryos. These results indicate that BU1 may participate in some other unknown processes modulated by BR in rice.
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Affiliation(s)
- Atsunori Tanaka
- Disease Resistance Research Unit, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan
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Nakamura SI, Kawai T, Kamakura T, Ookura T. TGF-beta3 is expressed in taste buds and inhibits proliferation of primary cultured taste epithelial cells. In Vitro Cell Dev Biol Anim 2009; 46:36-44. [PMID: 19787410 DOI: 10.1007/s11626-009-9239-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2009] [Accepted: 09/03/2009] [Indexed: 12/20/2022]
Abstract
Transforming growth factor-betas (TGF-betas), expressed in various tissues, play important roles in embryonic development and adult tissue homeostasis through their effects on cell proliferation, cell differentiation, cell death, and cell motility. However, expression of TGF-beta signaling components and their biological effect on taste epithelia has not been elucidated. We performed expression analysis of TGF-beta signaling components in taste epithelia and found that the TGF-beta3 mRNA was specifically expressed in taste buds. Type II TGF-betas receptor (TbetaR-II) mRNA was specifically expressed in the tongue epithelia including the taste epithelia. To elucidate the biological function of TGF-beta3 in taste epithelia, we performed proliferation assay with primary cultured taste epithelial cells. In the presence of TGF-beta3, percentage of BrdU-labeled cells decreased significantly, suggesting that the TGF-beta3 inhibited the proliferation of cultured taste epithelial cells through inhibiting cell-cycle entry into S phase. By quantitative reverse transcription-polymerase chain reaction assay, we found that the TGF-beta3 resulted in an increased level of expression of p15Ink4b and p21Cip1, suggesting that the TGF-beta3 inhibited the taste epithelial cell proliferation through inhibiting G1cyclin-Cdk complexes. Taken together, these results suggested that the TGF-beta3 may regulate taste epithelial cell homeostasis through controlling cell proliferation.
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Affiliation(s)
- Shin-ichi Nakamura
- Food Function Division, National Food Research Institute, National Agriculture and Food Research Organization, Kannondai 2-1-12, Tsukuba, Ibaraki 305-8642, Japan
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Imamura T, Yasuda M, Kusano H, Nakashita H, Ohno Y, Kamakura T, Taguchi S, Shimada H. Acquired resistance to the rice blast in transgenic rice accumulating the antimicrobial peptide thanatin. Transgenic Res 2009; 19:415-24. [PMID: 19784861 DOI: 10.1007/s11248-009-9320-x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2008] [Accepted: 08/28/2009] [Indexed: 11/25/2022]
Abstract
Thanatin is an antimicrobial peptide with a strong and wide-ranging antimicrobial spectrum, including certain species of fungi and Gram-negative and Gram-positive bacteria. To evaluate the application of thanatin to the generation of disease-resistant plants, we introduced a synthetic thanatin gene into rice. Several transformants that expressed the introduced gene showed significant level of antimicrobial activity. The substances showing antimicrobial activity were partially purified from these transformants and their properties were determined. The molecule with characteristics similar to those of native thanatin on the elution pattern in HPLC analysis had an identical molecular mass to that of native molecule. It should also be noted that the transformant acquired a sufficient level of resistance to the rice blast fungus, Magnaporthe oryzae, presumably due to the repressive activity of thanatin to its initial stage of infection. This result demonstrates that thanatin has antifungal activity for M. oryzae and that the introduction of the thanatin gene into rice is effective in generating a plant resistant to rice blast disease.
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Affiliation(s)
- Tomohiro Imamura
- Department of Biological Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, 278-8510, Japan
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Izawa M, Takekawa O, Arie T, Teraoka T, Yoshida M, Kimura M, Kamakura T. Inhibition of histone deacetylase causes reduction of appressorium formation in the rice blast fungus Magnaporthe oryzae. J GEN APPL MICROBIOL 2009; 55:489-98. [DOI: 10.2323/jgam.55.489] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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