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Suzuki Y, Ishitsuka T, Takagi M, Sasaki Y, Kakuda T, Kobayashi K, Kubota H, Ono HK, Kabeya H, Irie T, Andoh M, Asakura H, Takai S. Isolation and genetic characterization of Staphylococcus aureus from wild animal feces and game meats. Folia Microbiol (Praha) 2024; 69:347-360. [PMID: 37405631 DOI: 10.1007/s12223-023-01071-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 06/12/2023] [Indexed: 07/06/2023]
Abstract
The populations of Japanese deer and boar have increased dramatically and have a serious impact on farming and mountain villages. Although the Japanese government promotes the use of captured wild animals, game meat is not subject to sanitary control considering that it is not subject to meat inspection or quality control. Here, we have attempted to isolate Staphylococcus aureus, a typical foodborne pathogen, as a part of an investigation of contamination in the meats of wild animals and their processing stages. We examined 390 samples of deer feces, 117 samples of wild boar feces, and 75 samples of disemboweled deer meat for isolation of S. aureus; ultimately, 30 (positive rate: 7.7%), 2 (1.7%), and 21 (28.0%) strains were isolated, respectively, from the samples. The genome sequences of these isolates were analyzed and were subjected to multilocus sequence typing. We identified 12 new sequence types (STs) and a dominant population of S. aureus with a characteristic genetic background in wild animals, namely, the ST groups derived from CC121 (number of strains = 39). These strains did not harbor the enterotoxin gene or only harbored egc-related enterotoxin, which is of low involvement in Staphylococcal food poisoning. However, one ST2449 strain, which produces causative enterotoxins, was isolated from a deer's feces. Since there are several common STs isolated from feces and dismembered meat and because fecal contamination during dismemberment is suspected, continuous monitoring and guidance for improving sanitary management conditions during processing and handling of the meat are highly warranted with immediate effect.
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Affiliation(s)
- Yasunori Suzuki
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Higashi 23-35-1, Towada, Aomori, 034-8628, Japan.
| | - Toko Ishitsuka
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Higashi 23-35-1, Towada, Aomori, 034-8628, Japan
| | - Miu Takagi
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Higashi 23-35-1, Towada, Aomori, 034-8628, Japan
| | - Yukako Sasaki
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Higashi 23-35-1, Towada, Aomori, 034-8628, Japan
| | - Tsutomu Kakuda
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Higashi 23-35-1, Towada, Aomori, 034-8628, Japan
| | - Kai Kobayashi
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, 3-24-1 Hyakunin-Cho, Shinjuku-Ku, Tokyo, 169-0073, Japan
| | - Hiroaki Kubota
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, 3-24-1 Hyakunin-Cho, Shinjuku-Ku, Tokyo, 169-0073, Japan
| | - Hisaya K Ono
- Laboratory of Zoonoses, Kitasato University School of Veterinary Medicine, Higashi 23-35-1, Towada, Aomori, 034-8628, Japan
| | - Hidenori Kabeya
- Laboratory of Veterinary Food Hygiene, Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa, 252-0880, Japan
| | - Takao Irie
- Laboratory of Veterinary Parasitic Diseases, Department of Veterinary Sciences, Faculty of Agriculture, University of Miyazaki, 1-1 Gakuen-Kibanadai-Nishi, Miyazaki, 889-2192, Japan
| | - Masako Andoh
- Department of Pathogenetic and Preventive Veterinary Science, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima, Kagoshima, 890-0065, Japan
| | - Hiroshi Asakura
- Division of Biomedical Food Research, National Institute of Health Sciences, 3-25-26, Tonomachi, Kawasaki-Ku, Kawasaki, Kanagawa, 210-9501, Japan
| | - Shinji Takai
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Higashi 23-35-1, Towada, Aomori, 034-8628, Japan
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Kobayashi K, Kubota H, Tohya M, Ushikubo M, Yamamoto M, Ariyoshi T, Uchitani Y, Mitobe M, Okuno R, Nakagawa I, Sekizaki T, Suzuki J, Sadamasu K. Characterization of pig tonsils as niches for the generation of Streptococcus suis diversity. Vet Res 2024; 55:17. [PMID: 38321502 PMCID: PMC10848530 DOI: 10.1186/s13567-024-01270-5] [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: 09/12/2023] [Accepted: 01/12/2024] [Indexed: 02/08/2024] Open
Abstract
Streptococcus suis is a gram-positive bacterium that causes meningitis, septicemia, endocarditis, and other disorders in pigs and humans. We obtained 42 and 50 S. suis isolates from lesions of porcine endocarditis and palatine tonsils, respectively, of clinically healthy pigs in Japan; we then determined their sequence types (STs) by multilocus sequence typing (MLST), cps genotypes, serotypes, and presence of classical major virulence-associated marker genes (mrp, epf, and sly). The 42 isolates from endocarditis lesions were assigned to a limited number of STs and clonal complexes (CCs). On the other hand, the 50 isolates from tonsils were diverse in these traits and seemingly in the degree of virulence, suggesting that tonsils can accommodate a variety of S. suis isolates. The goeBURST full algorithm using tonsil isolates obtained in this study and those retrieved from the database showed that major CCs as well as many other clusters were composed of isolates originating from different countries, and some of the STs were very similar to each other despite the difference in country of origin. These findings indicate that S. suis with not only different but also similar mutations in the genome have survived in tonsils independently across different geographical locations. Therefore, unlike the lesions of endocarditis, the tonsils of pigs seemingly accommodate various S. suis lineages. The present study suggests that S. suis acquired its diversity by natural mutations during colonization and persistence in the tonsils of pigs.
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Affiliation(s)
- Kai Kobayashi
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunincho 3-24-1, Shinjuku-ku, Tokyo, 169-0073, Japan.
| | - Hiroaki Kubota
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunincho 3-24-1, Shinjuku-ku, Tokyo, 169-0073, Japan
| | - Mari Tohya
- Division of Biomedical Food Research, National Institute of Health Sciences, Tonomachi 3-25-26, Kawasaki-ku, Kawasaki-shi, Kanagawa, 210-9501, Japan
- Department of Microbiology and Department of Microbiome Research, Juntendo University School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo, 113-8421, Japan
| | - Megumi Ushikubo
- Shibaura Meat Sanitary Inspection Station, Tokyo Metropolitan Government, Konan 2-7-19, Minato-ku, Tokyo, 108-0075, Japan
| | - Miki Yamamoto
- Shibaura Meat Sanitary Inspection Station, Tokyo Metropolitan Government, Konan 2-7-19, Minato-ku, Tokyo, 108-0075, Japan
| | - Tsukasa Ariyoshi
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunincho 3-24-1, Shinjuku-ku, Tokyo, 169-0073, Japan
| | - Yumi Uchitani
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunincho 3-24-1, Shinjuku-ku, Tokyo, 169-0073, Japan
| | - Morika Mitobe
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunincho 3-24-1, Shinjuku-ku, Tokyo, 169-0073, Japan
| | - Rumi Okuno
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunincho 3-24-1, Shinjuku-ku, Tokyo, 169-0073, Japan
| | - Ichiro Nakagawa
- Department of Microbiology, Graduate School of Medicine, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Tsutomu Sekizaki
- Department of Microbiology, Graduate School of Medicine, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto, 606-8501, Japan
- Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Jun Suzuki
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunincho 3-24-1, Shinjuku-ku, Tokyo, 169-0073, Japan
| | - Kenji Sadamasu
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunincho 3-24-1, Shinjuku-ku, Tokyo, 169-0073, Japan
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Ando N, Mizushima D, Shimizu Y, Uemura Y, Takano M, Mitobe M, Kobayashi K, Kubota H, Miyake H, Suzuki J, Sadamasu K, Nakamoto T, Aoki T, Watanabe K, Oka S, Gatanaga H. Sitafloxacin- Versus Moxifloxacin-Based Sequential Treatment for Mycoplasma Genitalium Infections: Protocol for a Multicenter, Open-Label Randomized Controlled Trial. JMIR Res Protoc 2023; 12:e52565. [PMID: 37962941 PMCID: PMC10685287 DOI: 10.2196/52565] [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: 09/08/2023] [Revised: 10/16/2023] [Accepted: 10/24/2023] [Indexed: 11/15/2023] Open
Abstract
BACKGROUND Mycoplasma genitalium is an emerging sexually transmitted pathogen associated with increasing antibiotic resistance. The current treatment guidelines recommend moxifloxacin-sequential therapy for macrolide-resistant Mgenitalium or strains with unknown resistance profiles. However, it is unclear whether sitafloxacin, a 4th-generation fluoroquinolone antibiotic, is effective against resistant strains. OBJECTIVE This study aims to assess and compare the efficacy and safety of sitafloxacin- and moxifloxacin-based treatment regimens for managing Mgenitalium infections. METHODS We will conduct this randomized controlled trial at multiple centers in Japan. Eligible participants include adults aged 18 years or older with a confirmed Mgenitalium infection, as determined through the nucleic acid amplification test. Patients will be randomly assigned using a stratified approach based on the treatment facility and infection site. The interventions comprise oral sitafloxacin (200 mg) daily for 7 days (with optional pretreatment of oral doxycycline, 200 mg, daily for up to 7 days), with a control group receiving oral doxycycline (200 mg) daily for 7 days followed by moxifloxacin (400 mg) daily for another 7 days. The primary outcome is the treatment success rate with a superiority margin of 10%, as confirmed through the nucleic acid amplification test. Secondary outcomes encompass changes in the bacterial load at the urogenital or rectal sites and the emergence of posttreatment-resistant mutant strains. RESULTS Enrollment commenced in June 2023 and will conclude in December 2024, with findings anticipated by 2025. The expected success rates fall within the range of 80% for sitafloxacin and 42% for moxifloxacin against Mgenitalium carrying the G248T (S83I) mutation, based on previous studies. Accordingly, with a 5% significance level (2-sided) and 80% statistical power, we aim to recruit 50 participants per group, factoring in a 10% expected dropout rate. CONCLUSIONS This study will provide valuable insights into the efficacy and safety of sitafloxacin- versus moxifloxacin-based sequential therapy in treating Mgenitalium infections. These findings have the potential to influence clinical guidelines, favoring more effective therapeutic choices. The multicenter approach enhances the robustness of this study. However, a limitation is the potential insufficiency of statistical power to detect posttreatment-resistant mutant strains in each group, rendering posttreatment-resistance mutations a notable concern. In the future, we may need to increase the sample size to enhance power. TRIAL REGISTRATION Japan Registry of Clinical Trials (jRCTs031230111); https://jrct.niph.go.jp/en-latest-detail/jRCTs031230111. INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID) DERR1-10.2196/52565.
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Affiliation(s)
- Naokatsu Ando
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Daisuke Mizushima
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Yosuke Shimizu
- Biostatistics Section, Department of Data Science, National Center for Global Health and Medicine, Tokyo, Japan
| | - Yukari Uemura
- Biostatistics Section, Department of Data Science, National Center for Global Health and Medicine, Tokyo, Japan
| | - Misao Takano
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Morika Mitobe
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Kai Kobayashi
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Hiroaki Kubota
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Hirofumi Miyake
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Jun Suzuki
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Kenji Sadamasu
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Takato Nakamoto
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Takahiro Aoki
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Koji Watanabe
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Shinichi Oka
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Hiroyuki Gatanaga
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
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Kawahara D, Nishioka R, Murakami Y, Emoto Y, Iwashita K, Kubota H, Sasaki R, Nagata Y. A Nomogram Based on Pretreatment Radiomics and Dosiomics Features for Predicting Overall Survival for Esophageal Squamous Cell Cancer: Multi-Institutional Study. Int J Radiat Oncol Biol Phys 2023; 117:e470-e471. [PMID: 37785496 DOI: 10.1016/j.ijrobp.2023.06.1678] [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: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) The current study aims to propose a nomogram-based 2- and 3-years survival prediction model for esophageal squamous cell carcinoma treated by definitive radiotherapy using pretreatment computed tomography (CT), positron emission tomography (FDG PET) radiomic features and dosiomics features in addition to the common clinical factors using multi-institution data. MATERIALS/METHODS Data of 112 patients from one institution and 28 patients from the other institution were retrospectively collected. Radiomics and dosiomics features were extracted using five segmentations on CT and PET images and dose distribution. The least absolute shrinkage and selection operator (LASSO) with logistic regression was used to select radiomics and dosiomics features by calculating the radiomics and dosiomics scores (Rad-score and Dos-score), respectively, in the training model. The predictive clinical factors, Rad-score, and Dos-score were identified to develop a nomogram model. RESULTS We extracted 15219 features from the radiomics and dosiomics analysis. By LASSO Cox regression analysis, 13 CT-based radiomics features, 11 PET-based radiomics features, and 19 dosiomics features were selected. Clinical factors of T-stage, N-stage, and clinical stage were selected as significant prognostic factors by univariate Cox regression analysis. A predictive nomogram for prognosis in was established using these factors. In the external validation cohort, the C-index of the combined model of CT-based radiomics, PET-based radiomics, and dosiomics features with clinical factors were 0.74, 0.82, and 0.92, respectively. Moreover, we divided the cohort into high-risk and low-risk groups using the median nomogram score. Significant differences in overall survival (OS) in the combine model of CT-based radiomics, PET-based radiomics, and dosiomics features with clinical factors were observed between the high-risk and low-risk groups (P = 0.019, P = 0.038, and 0.014, respectively). CONCLUSION The current study established and validated 2- and 3-year survival prediction models based on radiomics and dosiomics features with clinical factors. The prediction model with dosiomics analysis could better predict OS than CT- and PET-based radiomics analysis in esophageal cancer patients treated with radiotherapy.
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Affiliation(s)
- D Kawahara
- Department of Radiation Oncology, Hiroshima University Hospital, Hiroshima, Japan
| | - R Nishioka
- Department of Radiation Oncology, Graduate School of Biomedical Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Y Murakami
- Department of Radiation Oncology, Graduate School of Biomedical Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Y Emoto
- Department of Radiation Oncology, Hyogo Cancer Center, Kobe, Japan
| | - K Iwashita
- Kobe Minimally invasive Cancer Center, Kobe, Japan
| | - H Kubota
- Division of Radiation Oncology, Kobe University Graduate School of Medicine, Kobe, Japan
| | - R Sasaki
- Division of Radiation Oncology, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Y Nagata
- Department of Radiation Oncology, Graduate School of Biomedical Health Sciences, Hiroshima University, Hiroshima, Japan
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Kubota H, Nakayama T, Ariyoshi T, Uehara S, Uchitani Y, Tsuchida S, Nishiyama H, Morioka I, Koshinaga T, Kusabuka A, Nakatsubo N, Yamagishi T, Tabuchi Y, Okuno R, Kobayashi K, Mitobe M, Yokoyama K, Shinkai T, Suzuki J, Sadamasu K. Emergence of Phytobacter diazotrophicus carrying an IncA/C 2 plasmid harboring bla NDM-1 in Tokyo, Japan. mSphere 2023; 8:e0014723. [PMID: 37449846 PMCID: PMC10449528 DOI: 10.1128/msphere.00147-23] [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: 03/25/2023] [Accepted: 06/02/2023] [Indexed: 07/18/2023] Open
Abstract
Phytobacter diazotrophicus is an Enterobacterales species that was originally identified as a plant growth-promoting, Gram-negative bacterium. Recently, this species has been recognized as relevant to opportunistic human and nosocomial infections in clinical settings. Its frequent misidentification as other Enterobacterales species from clinical examination occasionally causes a delay in the identification of nosocomial outbreaks. Here, we report the emergence of New Delhi metallo-β-lactamase (NDM)-producing P. diazotrophicus isolated from hospitalized pediatric patients and hospital environments in Tokyo, Japan. In our case, these isolates were found during an investigation of carbapenem-resistant Enterobacterales in relation to nosocomial infections. Whole-genome sequencing is useful for overcoming the difficulty of species identification. Furthermore, we found that bla NDM-1 was carried by an IncA/C2 plasmid (approximately 170 kbp), which was transferrable from the clinical isolates to the recipient strain Escherichia coli J53. Our study demonstrated that P. diazotrophicus behaves as a carrier of bla NDM-harboring plasmids, potentially disseminating resistance to carbapenems among Enterobacterales. IMPORTANCE Early detection of nosocomial outbreaks is important to minimize the spread of bacteria. When an outbreak is caused by multidrug-resistant bacteria such as carbapenem-resistant Enterobacterales, a delay in findings makes it difficult to control it because such bacteria often spread not only among human patients but also in hospital environments. Phytobacter diazotrophicus, an Enterobacterales species that has recently been found to be relevant to clinical settings, is often misidentified as other bacteria in clinical laboratories. Here, we found NDM-producing P. diazotrophicus in hospitalized pediatric patients and their environment in Tokyo, Japan. Given that the isolates carried bla NDM-1-harboring transferrable plasmids, the influence of such bacteria could be greater with the mediation of horizontal transfer of carbapenem resistance. Our findings suggest that P. diazotrophicus should be recognized as an NDM-carrier, for which more attention should be paid in clinical settings.
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Affiliation(s)
- Hiroaki Kubota
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - Tomohiro Nakayama
- Division of Laboratory Medicine and Companion Diagnostics, Department of Pathology and Microbiology, Nihon University School of Medicine, Itabashi-ku, Tokyo, Japan
| | - Tsukasa Ariyoshi
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - Satomi Uehara
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - Yumi Uchitani
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - Sachio Tsuchida
- Division of Laboratory Medicine and Companion Diagnostics, Department of Pathology and Microbiology, Nihon University School of Medicine, Itabashi-ku, Tokyo, Japan
| | - Hiroyuki Nishiyama
- Clinical Laboratory Department, Surugadai Nihon University Hospital, Chiyoda-ku, Tokyo, Japan
| | - Ichiro Morioka
- Department of Pediatrics and Child Health, Nihon University School of Medicine, Oyaguchi, Itabashi-ku, Tokyo, Japan
| | - Tsugumichi Koshinaga
- Department of Pediatric Surgery, Nihon University School of Medicine, Itabashi-ku, Tokyo, Japan
| | - Akiko Kusabuka
- Department of Planning and Coordination, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - Naoki Nakatsubo
- Department of Planning and Coordination, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - Takuya Yamagishi
- Antimicrobial Resistance Research Center, National Institute of Infectious Diseases, Shinjuku-ku, Tokyo, Japan
| | - Yuri Tabuchi
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - Rumi Okuno
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - Kai Kobayashi
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - Morika Mitobe
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - Keiko Yokoyama
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - Takayuki Shinkai
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - Jun Suzuki
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - Kenji Sadamasu
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
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Ando N, Mizushima D, Takano M, Mitobe M, Kobayashi K, Kubota H, Miyake H, Suzuki J, Sadamasu K, Aoki T, Watanabe K, Uemura H, Yanagawa Y, Gatanaga H, Oka S. Effectiveness of sitafloxacin monotherapy for quinolone-resistant rectal and urogenital Mycoplasma genitalium infections: a prospective cohort study. J Antimicrob Chemother 2023:dkad208. [PMID: 37376970 PMCID: PMC10393875 DOI: 10.1093/jac/dkad208] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Accepted: 06/16/2023] [Indexed: 06/29/2023] Open
Abstract
BACKGROUND Mycoplasma genitalium has a tendency to develop macrolide and quinolone resistance. OBJECTIVES We investigated the microbiological cure rate of a 7 day course of sitafloxacin for the treatment of rectal and urogenital infections in MSM. PATIENTS AND METHODS This open-label, prospective cohort study was conducted at the National Center for Global Health and Medicine, Tokyo, Japan from January 2019 to August 2022. Patients with M. genitalium urogenital or rectal infections were included. The patients were treated with sitafloxacin 200 mg daily for 7 days. M. genitalium isolates were tested for parC, gyrA and 23S rRNA resistance-associated mutations. RESULTS In total, 180 patients (median age, 35 years) were included in this study, of whom 77.0% (97/126) harboured parC mutations, including 71.4% (90/126) with G248T(S83I) in parC, and 22.5% (27/120) harboured gyrA mutations. The median time to test of cure was 21 days. The overall microbiological cure rate was 87.8%. The cure rate was 100% for microbes harbouring parC and gyrA WTs, 92.9% for microbes harbouring parC G248T(S83I) and gyrA WT, and 41.7% for microbes harbouring parC G248T(S83I) and gyrA with mutations. The cure rate did not differ significantly between urogenital and rectal infection (P = 0.359). CONCLUSIONS Sitafloxacin monotherapy was highly effective against infection caused by M. genitalium, except strains with combined parC and gyrA mutations. Sitafloxacin monotherapy can be used as a first-line treatment for M. genitalium infections in settings with a high prevalence of parC mutations and a low prevalence of gyrA mutations.
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Affiliation(s)
- Naokatsu Ando
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Daisuke Mizushima
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Misao Takano
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Morika Mitobe
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Kai Kobayashi
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Hiroaki Kubota
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Hirofumi Miyake
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Jun Suzuki
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Kenji Sadamasu
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Takahiro Aoki
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Koji Watanabe
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Haruka Uemura
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Yasuaki Yanagawa
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Hiroyuki Gatanaga
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Shinichi Oka
- AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan
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Yanagiba Y, Takeda T, Yamano S, Amamoto T, Yamada M, Kubota H, Suzuki M, Saito M, Umeda Y, Wang RS, Koda S. P19-05 Challenges in developing a novel accelerated silicosis rat model by single intratracheal instillation of high-purity crystalline silica particles. Toxicol Lett 2022. [DOI: 10.1016/j.toxlet.2022.07.654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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8
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Tsuboi K, Katsumori T, Mino D, Kubota H, Yoshikawa T. Uro-lymphatic fistula associated with urolithiasis: A case report. Radiol Case Rep 2022; 17:1521-1523. [PMID: 35282326 PMCID: PMC8904381 DOI: 10.1016/j.radcr.2022.02.031] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 02/06/2022] [Accepted: 02/08/2022] [Indexed: 11/30/2022] Open
Abstract
Uro-lymphatic fistulas are rare, and involve communication between the renal collecting system and the lymphatic system. The disorder is usually caused by the obstruction of lymphatic vessels due to several diseases, leading to chyluria. Here, we report the case of a patient with a uro-lymphatic fistula, considered to be associated with urolithiasis.
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Affiliation(s)
- Keisuke Tsuboi
- Department of Radiology, Saiseikai Shiga Hospital, Ohashi 2-4-1, Ritto, Shiga, 520-3046, Japan
- Corresponding author.
| | - Tetsuya Katsumori
- Department of Radiology, Saiseikai Shiga Hospital, Ohashi 2-4-1, Ritto, Shiga, 520-3046, Japan
| | - Daichi Mino
- Department of Radiology, Saiseikai Shiga Hospital, Ohashi 2-4-1, Ritto, Shiga, 520-3046, Japan
| | - Hiroaki Kubota
- Department of Radiology, Saiseikai Shiga Hospital, Ohashi 2-4-1, Ritto, Shiga, 520-3046, Japan
| | - Tatsuya Yoshikawa
- Department of Radiology, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kyoto, 602-8566, Japan
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9
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Suzuki Y, Takai S, Kubota H, Hasegawa N, Ito S, Yabuuchi Y, Sasaki Y, van Duijkeren E, Kakuda T. Rhodococcus equi U19 strain harbors a nonmobilizable virulence plasmid. Microbiol Immunol 2022; 66:307-316. [PMID: 35274358 DOI: 10.1111/1348-0421.12975] [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: 02/13/2022] [Revised: 03/08/2022] [Accepted: 03/09/2022] [Indexed: 11/26/2022]
Abstract
Rhodococcus equi is the causative agent of pyogenic pneumonia in foals, and a virulence-associated protein A (VapA) encoded on the pVAPA virulence plasmid is important for its pathogenicity. In this study, we analyzed the virulence of R. equi strain U19, originally isolated in the Netherlands in 1997 and the genetic characteristics of the pVAPA_U19 plasmid. U19 expressed VapA that was regulated by temperature and pH and underwent significant intracellular proliferation in macrophages. The restriction fragment length polymorphism of pVAPA_U19 digested with EcoRI was similar to that of pREAT701 (85-kb type I) harbored by R. equi ATCC33701, although the band pattern at 10-20 kb differed. Whole-genome sequencing showed that pVAPA_U19 was 51,684 bp in length and that the vapA pathogenicity island region and the replication/participation were almost identical to those in pREAT701. In contrast, the ORF26 to ORF45 genes of pREAT701 (approximately 29,000 bp) were absent from pVAPA_U19. In this lacking region, mobility (MOB) genes, such as relaxase, which allows conjugative DNA processing, and the mating pair formation (MPF) genes, which are a form of the type IV secretion system and provides the mating channel, were present. Co-culture between U19 and five different recipient strains (two plasmid-cured strains and three cryptic plasmid-harboring strains) demonstrated that pVAPA_U19 could not support conjugation. Therefore, pVAPA_U19 does not differ significantly from the previously reported pVAPA in terms of virulence and plasmid replication and maintenance but is a nonmobilizable plasmid unable to cause conjugation because of the absence of genes related to MOB and MPF. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Yasunori Suzuki
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Aomori, Japan
| | - Shinji Takai
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Aomori, Japan
| | - Hiroaki Kubota
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Noeru Hasegawa
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Shino Ito
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Aomori, Japan
| | - Yoshino Yabuuchi
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Aomori, Japan
| | - Yukako Sasaki
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Aomori, Japan
| | - Engeline van Duijkeren
- Center for Infectious Disease Control, National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands
| | - Tsutomu Kakuda
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Aomori, Japan
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10
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Kubota H, Ogawa H, Miyazaki M, Ishii S, Oyama K, Kawamura Y, Ishiwata S, Suzuki M. Microscopic Temperature Control Reveals Cooperative Regulation of Actin-Myosin Interaction by Drebrin E. Nano Lett 2021; 21:9526-9533. [PMID: 34751025 DOI: 10.1021/acs.nanolett.1c02955] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Drebrin E is a regulatory protein of intracellular force produced by actomyosin complexes, that is, myosin molecular motors interacting with actin filaments. The expression level of drebrin E in nerve cells decreases as the animal grows, suggesting its pivotal but unclarified role in neuronal development. Here, by applying the microscopic heat pulse method to actomyosin motility assay, the regulatory mechanism is examined from the room temperature up to 37 °C without a thermal denaturing of proteins. We show that the inhibition of actomyosin motility by drebrin E is eliminated immediately and reversibly during heating and depends on drebrin E concentration. The direct observation of quantum dot-labeled drebrin E implies its stable binding to actin filaments during the heat-induced sliding. Our results suggest that drebrin E allosterically modifies the actin filament structure to regulate cooperatively the actomyosin activity at the maintained in vivo body temperature.
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Affiliation(s)
- Hiroaki Kubota
- Department of Physics, Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, 3-24-1 Hyakunincho, Shinjuku-ku, Tokyo 169-0073, Japan
| | - Hiroyuki Ogawa
- Department of Physics, Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Makito Miyazaki
- Hakubi Center for Advanced Research, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan
- Department of Physics, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
- PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
- Institut Curie, PSL Research University, CNRS, UMR 144, Paris F-75005, France
| | - Shuya Ishii
- Department of Physics, Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
- Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology, 1233 Watanuki-machi, Takasaki, Gunma 370-1292, Japan
| | - Kotaro Oyama
- Department of Physics, Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
- PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
- Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology, 1233 Watanuki-machi, Takasaki, Gunma 370-1292, Japan
| | - Yuki Kawamura
- Department of Physics, Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Shin'ichi Ishiwata
- Department of Physics, Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Madoka Suzuki
- Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka 565-0871, Japan
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11
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Suzuki Y, Kubota H, Madarame H, Takase F, Takahashi K, Sasaki Y, Kakuda T, Takai S. Pathogenicity and genomic features of vapN-harboring Rhodococcus equi isolated from human patients. Int J Med Microbiol 2021; 311:151519. [PMID: 34280738 DOI: 10.1016/j.ijmm.2021.151519] [Citation(s) in RCA: 11] [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: 03/07/2021] [Revised: 05/20/2021] [Accepted: 07/01/2021] [Indexed: 11/16/2022] Open
Abstract
Rhodococcus equi is a saprophytic soil bacterium and intracellular pathogen that causes refractory suppurative pneumonia in foals and has emerged as a pathogenic cause of zoonotic disease. Several studies have reported human infections caused by R. equi harboring a recently described third type of virulence plasmid, the ruminant-associated pVAPN, which carries the vapN virulence determinant. Herein, we analyzed pathogenicity and genomic features of nine vapN-harboring R. equi isolated from human patients with and without HIV/AIDS. Four of these strains showed significant VapN production and proliferation in cultured macrophages. These strains were lethally pathogenic after inoculation with 1.0 × 108 CFU in mice and reproduced a necrotizing granulomatous inflammation in the liver and spleen similar to that observed in humans. Additionally, we determined entire genome sequences of all nine strains. Lengths of sequences were 5.0-5.3 Mbp, and GC contents were 68.7 %-68.8 %. All strains harbored a 120- or 125-kbp linear plasmid carrying vapN (Type I or Type II pVAPN) classified on the basis of differences in the distal sequences on the 3' side. Interestingly, VapN production differed significantly among strains harboring nearly identical types of pVAPN with variation limited to several SNPs and short base pair indels. The pVAPN sequences possessed by the VapN-producing strains did not retain any common genetic characteristics, and more detailed analyses, including chromosomal genes, are needed to further elucidate the VapN expression mechanism.
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Affiliation(s)
- Yasunori Suzuki
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Aomori, Japan.
| | - Hiroaki Kubota
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Hiroo Madarame
- Laboratory of Small Animal Clinics, Veterinary Teaching Hospital, Azabu University, Kanagawa, Japan
| | - Fumiaki Takase
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Aomori, Japan
| | - Kei Takahashi
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Aomori, Japan
| | - Yukako Sasaki
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Aomori, Japan
| | - Tsutomu Kakuda
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Aomori, Japan
| | - Shinji Takai
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Aomori, Japan
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12
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Tamaru S, Tsunegi S, Kubota H, Yuasa S. Erratum: "Vector network analyzer ferromagnetic resonance spectrometer with field differential detection" [Rev. Sci. Instrum. 89, 053901 (2018)]. Rev Sci Instrum 2021; 92:069902. [PMID: 34243498 DOI: 10.1063/5.0056012] [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] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Accepted: 05/11/2021] [Indexed: 06/13/2023]
Affiliation(s)
- S Tamaru
- Spintronics Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8568, Japan
| | - S Tsunegi
- Spintronics Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8568, Japan
| | - H Kubota
- Spintronics Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8568, Japan
| | - S Yuasa
- Spintronics Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8568, Japan
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13
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Miyawaki D, Yamada H, Kubota H, Sugimoto T, Saburi M, Wakana N, Matoba S. Maternal high-fat diet promotes calcified atherosclerotic plaque formation in adult offspring by enhancing transformation of vascular smooth muscle cells to osteochondrocytic-like phenotype. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3796] [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: 11/15/2022] Open
Abstract
Abstract
Background and objective
Maternal high-fat diet (HFD) has been shown to modulate vascular function and remodeling in adult offspring. Atherosclerotic vascular calcification is closely associated with the onset of cardiovascular event. We therefore investigated the impact of maternal HFD on calcification of atherogenic plaques.
Methods and results
Eight-week-old female apo-E−/− mice (C57BL/6) were fed an HFD or a normal diet (ND) one week prior to mating, and the diet was continued throughout gestation and lactation. Offspring of both groups were fed a high-cholesterol diet (HCD) from 8 weeks of age. Ex vivo osteogenic activity of aortic root and aortic arch was analyzed using in vivo imaging system (IVIS) with OsteoSense 680. Sixteen-week-old male offspring of HFD-fed dams (O-HFD) showed a 1.4-fold increase in fluorescent intensity compared with those of ND-fed dams (O-ND) (p<0.05). Likewise, female O-HFD showed a significantly increased osteogenic activity in aortic arch (154%, p<0.05). Percentages of plaque area and oil red O-positive area were comparable between O-ND and O-HFD of both genders, suggesting that augmented osteogenic activity in O-HFD is not dependent on the plaque size. To investigate the underlying mechanism of augmented calcified plaque formation in O-HFD, vascular smooth muscle cells (VSMCs) of thoracic aorta form 8-week-old male offspring were primarily cultured and VSMCs calcification was induced by treatment with calcification media supplemented with phosphate (2.6 mM). Alizarin-red-positive area upon 10 days stimulation showed a 3.4-fold increase in VSMCs from O-HFD compared with that from O-ND (p<0.01). Consistently, western blotting analysis revealed that expression level of osteocalcin was significantly higher in O-HFD than O-ND, suggesting that osteochondrocytic transformation of VSMCs is augmented in O-HFD.
Conclusion
Our findings demonstrate that maternal HFD accelerates the development of atherogenic calcification independent of plaque size. In vitro transformation to osteochondrocytic-like cells is enhanced in VSMCs from offspring of HFD-fed dams. Inhibition of VSMCs skewing toward osteochondrocytic-like cells could be a potential therapeutic target for preventing the development of atherosclerotic vascular calcification.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- D Miyawaki
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine,, Kyoto, Japan
| | - H Yamada
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine,, Kyoto, Japan
| | - H Kubota
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine,, Kyoto, Japan
| | - T Sugimoto
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine,, Kyoto, Japan
| | - M Saburi
- Kyoto Second Red Cross Hospital, Department of Cardiovascular Medicine, Kyoto, Japan
| | - N Wakana
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine,, Kyoto, Japan
| | - S Matoba
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine,, Kyoto, Japan
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14
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Watanabe H, Koike A, Kato H, Wu L, Hayashi K, Kubota H, Konno H, Nishi I, Kawamoto H, Sato A, Matsumura A, Aonuma K, Sankai Y, Ieda M. Efficacy of cardiac rehabilitation with motion assistance from wearable cyborg hybrid assistive limb in patients with chronic heart failure: a randomized controlled trial. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.1067] [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
Recent Cochrane Systematic Review suggested that the participation in cardiac rehabilitation is associated with approximately 20% lower cardiovascular mortality and morbidity. Exercise therapy is the key component of cardiac rehabilitation programs. In recent years, innovative technologies have been introduced into the field of rehabilitation, and a typical example is the wearable cyborg Hybrid Assistive Limb (HAL). The wearable cyborg HAL provides motion assistance based on detection of bioelectrical signals on the skin surface when muscle forces are generated. The lumbar-type HAL is expected to expand the therapeutic options for severe cardiac patients who have difficulty in performing usual cardiac rehabilitation programs, such as bicycle pedaling or walking.
Purpose
We aim to compare the efficacy of exercise therapy performed with motion assistance from a lumbar-type HAL versus conventional training (sit-to-stand exercise without HAL) in patients with chronic heart failure.
Methods
This clinical trial is a randomized, non-blinded, and controlled study. Twenty-eight heart failure patients (73.1±13.8 years) who have difficulty in walking at the usual walking speed of healthy subjects were randomly assigned to 2 groups (HAL group or control group) with a 1:1 allocation ratio and performed sit-to stand exercise either with HAL or without HAL for 5 to 30 minutes once a day, and 6 to 10 days during the study period. The brain natriuretic peptide (BNP), isometric knee extensor strength, standing ability (30-seconds chair-stand test: CS-30), short physical performance battery (SPPB) and 6-minute walking distance (6MWD) were measured before and after the completion of cardiac rehabilitation. Cardiac events such as death, re-hospitalization, myocardial infarction and worsening of angina pectoris and heart failure during 1 year after discharge were evaluated.
Results
There was no significant difference in the number of days of exercise therapy between the two groups. BNP, SPPB and 6MWD were improved in both groups. In the HAL group, the isometric knee extensor strength (0.29±0.11 vs 0.35±0.11 kgf/kg, p=0.003) significantly improved and CS-30 (5.5±5.1 vs 8.2±5.3, p=0.054) tended to improve. However, in the control group, either the isometric knee extensor strength (0.35±0.11 vs 0.36±0.14 kgf/kg, p=0.424) or CS-30 (6.0±4.3 vs 9.2±6.2, p=0.075) did not significantly change. HAL group showed significantly more improvement in the isometric knee extensor strength than control group (p=0.045). Cardiac events occurred in 20% in the HAL group and 43% in the control group.
Conclusion
The improvement in isometric knee extensor strength with the assistance from lumbar-type HAL suggests that exercise therapy using this device may be useful in chronic heart failure patients with flail or sarcopenia, a strong poor prognostic factor in these patients.
Funding Acknowledgement
Type of funding source: Public grant(s) – National budget only. Main funding source(s): This work was supported in part by a grant-in-aid for Scientific Research from the Ministry of Education, Science, and Culture of Japan (JSPS KAKENHI grant number JP17K09485) and funded by the ImPACT Program of the Council for Science, Technology and Innovation (Cabinet Office, Government of Japan) (grant number 2017-PM05-03-01).
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Affiliation(s)
- H Watanabe
- Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - A Koike
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - H Kato
- Department of Rehabilitation, University of Tsukuba Hospital, Tsukuba, Japan
| | - L Wu
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - K Hayashi
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - H Kubota
- Master's Program in Medical Sciences, Graduate School of Comprehensive Human Sciences, University of, Tsukuba, Japan
| | - H Konno
- Department of Rehabilitation, University of Tsukuba Hospital, Tsukuba, Japan
| | - I Nishi
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - H Kawamoto
- Center for Cybernics Research, University of Tsukuba, Tsukuba, Japan
| | - A Sato
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - A Matsumura
- Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - K Aonuma
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Y Sankai
- Center for Cybernics Research, University of Tsukuba, Tsukuba, Japan
| | - M Ieda
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
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15
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Sugimoto T, Yamada H, Kubota H, Miyawaki D, Saburi M, Wakana N, Matoba S. Repeated social defeat exaggerates fibrin-rich clot formation in FeCl3-induced arterial thrombosis mouse model by enhancing NETs formation via modulation of neutrophil functional properties. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3817] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background and objective
Depression is an independent risk factor of cardiovascular disease (CVD). We have recently shown that repeated social defeat (RSD) precipitates depressive-like behaviors in apoE−/− mice and exaggerates atherosclerosis development by enhancing neutrophil extracellular traps (NETs) formation. Here, we investigated the impact of RSD on arterial thrombosis.
Methods and results
Eight-week-old male WT mice were exposed to RSD by housing with a larger CD-1 mouse in a shared home cage. They were subjected to vigorous physical contact daily for 10 consecutive days. Control mice were housed in the same gage without physical contact. After social interaction test to confirm depressive-like behaviors, defeated mice (19 of 31) and control mice (12 of 14) were underwent arterial injury at 10 wks of age. A filter paper saturated with 10% FeCl3 was applied on the adventitial surface of left carotid artery for 3 min and analyzed 3 hrs later. The volume of thrombi was comparable between the two groups. However, fibrinogen/fibrin-positive areas in immunofluorescent images significantly increased in defeated mice (27.8% vs. 48.8%, p<0.01). The number of Ly-6G-positive cells in thrombi was markedly higher in defeated mice (144/mm2 vs. 878/mm2, p<0.05). Further, Ly-6G-positive cells were almost accumulated at the inner surface of injured artery, which were co-localized with neutrophil elastase, Cit-H3, and CD41-positive staining. Treatment with DNase I completely diminished the exaggerated fibrin-rich clot formation in defeated mice to an extent similar to that in control mice (25.7% vs. 22.3%, p = ns), without affecting the volume of thrombi and accumulation of Ly-6G-positive cells. Given that platelet aggregations induced by ADP or collagen were comparable between the two groups, neutrophil functional properties primarily contribute to the exaggerated fibrin-rich clot formation in defeated mice. We then examined neutrophil subset and vulnerability to NETs formation. At 3 hrs after FeCl3 application, the numbers of immature neutrophils (Ly6Glo/+CXCR2-) were comparable between the two groups in both bone marrow (BM) and peripheral blood (PB). In contrast, the number of PB mature neutrophils (Ly6G+CXCR2+) was markedly higher in defeated mice than control mice (580±68 /μl vs. 1265±114, p<0.01). We next examined in vitro NETs formation upon PMA in BM mature neutrophils by FACS and nucleic acid staining. The percentage of double-positive cells (Cit-H3, MPO) was significantly higher in defeated mice (7.5% vs. 10.2%, p<0.05), as well as SYTOX green-positive cells expelling DNA fibers (8.1% vs. 11.8%, p<0.05).
Conclusions
Our findings demonstrate for the first time that repeated social defeat enhances fibrin-rich clot formation after arterial injury by enhancing NETs formation via modulation of neutrophil functional properties, suggesting that NETosis could be a new therapeutic target in depression-related CVD development.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- T Sugimoto
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - H Yamada
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - H Kubota
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - D Miyawaki
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - M Saburi
- Kyoto Second Red Cross Hospital, Department of Cardiovascular Medicine, Kyoto, Japan
| | - N Wakana
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - S Matoba
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
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16
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Saburi M, Yamada H, Sugimoto T, Kubota H, Miyawaki D, Wakana N, Matoba S. Maternal high-fat diet promotes the expansion of abdominal aortic aneurysm in adult offspring by enhancing osteoclast-like macrophage differentiation through down-regulation of IRF8 expression. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3790] [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 and objective
Maternal high-fat diet (HFD) has been shown to modulate vascular function and remodeling in adult offspring. Here, we investigated the impact of maternal HFD on abdominal aortic aneurysm (AAA) formation.
Methods and results
Eight-week-old female wild-type mice (C57BL/6) were fed a HFD or normal diet (ND) one week prior to mating, and the diet was continued throughout gestation and lactation. In eight-week-old male offspring, AAA was induced with the application of 0.5 M calcium chloride (CaCl2) on the infrarenal aorta. Offspring of HFD-fed dams (O-HFD) showed a significant increase in maximum outer diameter of AAA at 1, 4 and 8 weeks after surgery compared with offspring of ND-fed dams (O-ND). The lengths of outer circumference assessed by histological analysis were increased in O-HFD (p<0.05). Likewise, female O-HFD showed a greater length of outer circumference than female O-ND (p<0.05). While the number of F4/80-positive cells at 1 wk after surgery was comparable in the O-HFD and O-ND, the percentage of MMP-9/F4/80 double-positive cells was significantly increased in O-HFD. Consistently, fluorescent image of abdominal aorta taken by IVIS at 1 wk after surgery revealed a 2-fold increase in MMP activity. Intriguingly, F4/80-positive cells in O-HFD showed a 2.5-fold increase in co-staining with tartrate-resistant acid phosphate (TRAP), typical marker of osteoclast-like macrophages which abundantly secrete proteases than classically activated macrophages, while the percentage of TNF-α/F4/80 double-positive cells was comparable in the two groups. Pharmacological inhibition of osteoclastogenesis by zoledronic acid (ZA) (100μg/kg) completely abolished the exaggerated AAA development in O-HFD to an extent similar to that in O-ND, while AAA development in O-ND mice did not change after ZA treatment. Furthermore, in vitro TNF-α-induced osteoclast differentiation of bone marrow-derived macrophages (BMDMs) showed a significantly higher number of TRAP-positive cells in O-HFD, accompanied by a significant increase in osteoclast-related genes expression. Western blotting analysis revealed that the expression of NFATc1, master regulator of osteoclastogenesis, was significantly higher in O-HFD than that in O-ND, and immunofluorescent imaging showed that nuclear translocation of NFATc1 upon TNF-α stimulation was significantly enhanced in O-HFD. We further examined the expression of IFN regulatory factor 8 (IRF8) which suppresses osteoclastogenesis by inhibiting the function and expression of NFATc1. IRF8 mRNA and nuclear protein expression levels were significantly lower in O-HFD than those in O-ND.
Conclusion
Our findings demonstrate that maternal HFD accelerates CaCl2-induced AAA expansion, accompanied by the exaggerated accumulation of osteoclast-like macrophages and augmented activity of MMPs. Inhibition of macrophages skewing toward osteoclast-like cells could be a potential therapeutic target for preventing AAA development.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- M Saburi
- Kyoto Second Red Cross Hospital, Kyoto, Japan
| | - H Yamada
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - T Sugimoto
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - H Kubota
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - D Miyawaki
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - N Wakana
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - S Matoba
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
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17
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Kubota H, Yamada H, Sugimoto T, Miyawaki D, Saburi M, Wakana N, Matoba S. Repeated social defeat exaggerates CaCl2-induced abdominal aortic aneurysm expansion by eliminating periaortic fibrosis in tissue repair phase: possible involvement of specific subtypes of macrophages. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3791] [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: 11/15/2022] Open
Abstract
Abstract
Background and objective
Depression is an independent risk factor of cardiovascular disease (CVD) and significantly associated with the prevalence of abdominal aortic aneurysm (AAA). We have recently shown that repeated social defeat (RSD) precipitates depressive-like behaviors in apoE−/− mice and exaggerates atherosclerosis development by enhancing leukocyte activation. Here, we investigated the impact of RSD on AAA formation.
Methods and results
Eight-week-old male WT mice were exposed to RSD by housing with a larger CD-1 mouse in a shared home cage. They were subjected to vigorous physical contact daily for 10 consecutive days. Control mice were housed in the same gage without physical contact. After social interaction test to confirm depressive-like behaviors, defeated mice (28 of 48) and control mice (31 of 36) underwent application of 0.5 M calcium chloride (CaCl2) on the infrarenal aorta to induce AAA. At 1 week after application, maximum diameter and circumference of external elastic membrane were comparable between the two groups. The number of F-4/80, MMP-9, and TNF-α-positive cells in immunofluorescent images were also comparable. Further, in vitro bone marrow derived macrophages stimulation by LPS did not show any difference in mRNA expression levels of inflammatory cytokines, suggesting no discernable difference in acute inflammatory response between the two groups. In contrast, at 2 weeks after application, at the time point when MMP-9 and TNF-α-positive cells were scarcely observed, maximum diameter and circumference of external elastic membrane were significantly increased in defeated mice (0.72 mm vs. 0.90 mm, 1.59 mm vs. 2.00 mm, respectively, Control vs. Defeat, p<0.01). Intriguingly, periaortic fibrotic area in aneurysmal portion was markedly decreased in defeated mice (12.5×103 μm2 vs. 3.7×103 μm2, Control vs. Defeat, p<0.01). Consistently, accumulation of α-SMA-positive cells in adventitia of aneurysmal portion was much less in defeated mice than control mice (876 cells/mm2 vs. 319 cells/mm2, Control vs. Defeat, p<0.05), whereas those in tunica media of non-aneurysmal portion did not show any difference between the two groups. We next focused on the segregated nucleus-containing atypical monocyte (SatM), specific subtypes of monocytes/macrophages that are involved in fibrosis in injured tissues during the healing phase. We could observe SatM fraction in AAA tissue of control mice using flow cytometry. We also found that mRNA expression level of C/EBPβ, an essential regulator for SatM differentiation, was markedly decreased by 76% in BM cells of defeated mice compared with control mice (p<0.05).
Conclusions
Our findings demonstrate for the first time that RSD enhances AAA expansion by eliminating periaortic fibrosis in tissue repair phase, suggesting that the impaired resolution of acute inflammation after CaCl2 application contributes, at least in part, to the augmented expansion of AAA in defeated mice.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- H Kubota
- Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - H Yamada
- Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - T Sugimoto
- Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - D Miyawaki
- Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - M Saburi
- Kyoto Second Red Cross Hospital, Kyoto, Japan
| | - N Wakana
- Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - S Matoba
- Kyoto Prefectural University of Medicine, Kyoto, Japan
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18
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Suzuki Y, Ono HK, Shimojima Y, Kubota H, Kato R, Kakuda T, Hirose S, Hu DL, Nakane A, Takai S, Sadamasu K. A novel staphylococcal enterotoxin SE02 involved in a staphylococcal food poisoning outbreak that occurred in Tokyo in 2004. Food Microbiol 2020; 92:103588. [PMID: 32950172 DOI: 10.1016/j.fm.2020.103588] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2019] [Revised: 05/22/2020] [Accepted: 06/24/2020] [Indexed: 02/04/2023]
Abstract
Staphylococcal enterotoxins (SEs) are extracellular proteins, produced mainly by Staphylococcus aureus, which cause staphylococcal food poisoning (SFP) when ingested. Here, a novel SE was identified from two strains, which were identified as the causative microbes of the SFP outbreak that occurred in Tokyo in 2004. Both strains harbored the SEA gene, but its production was lower than that of other SEA-producing SFP isolates. Whole-genome sequencing analysis demonstrated that both strains harbored a SE-like gene besides sea. Phylogenetic analysis revealed that the amino acid sequence deduced from the SE-like gene belonged to the SEB group. Therefore, this gene was presumed to be a novel SE gene and termed "SE02." The stability of SE02 against heating and proteolytic digestions was a little different from that of SEA. SE02 has both superantigenic and emetic bioactivities. Namely, SE02 activated mouse splenocytes and exhibited emetic activity in the common marmoset. SE02 mRNA was highly expressed in both isolates during the exponential phase of cultivation. In addition, SE02 protein was produced at 20 °C and 25 °C, which reflects the actual situation of SFP. SE02 appears to be a novel emetic toxin that was likely the causative toxin in combination with SEA in the SFP outbreak.
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Affiliation(s)
- Yasunori Suzuki
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Higashi 23-35-1, Towada, Aomori, 034-8628, Japan; Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunin-cho 3-24-1, Shinjuku, Tokyo, 169-0073, Japan.
| | - Hisaya K Ono
- Laboratory of Zoonoses, Kitasato University School of Veterinary Medicine, Higashi 23-35-1, Towada, Aomori, 034-8628, Japan
| | - Yukako Shimojima
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunin-cho 3-24-1, Shinjuku, Tokyo, 169-0073, Japan
| | - Hiroaki Kubota
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunin-cho 3-24-1, Shinjuku, Tokyo, 169-0073, Japan
| | - Rei Kato
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunin-cho 3-24-1, Shinjuku, Tokyo, 169-0073, Japan
| | - Tsutomu Kakuda
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Higashi 23-35-1, Towada, Aomori, 034-8628, Japan
| | - Shouhei Hirose
- Department of Microbiology and Immunology, Hirosaki University Graduate School of Medicine, Zaifu-cho 5, Hirosaki, Aomori, 036-8562, Japan
| | - Dong-Liang Hu
- Laboratory of Zoonoses, Kitasato University School of Veterinary Medicine, Higashi 23-35-1, Towada, Aomori, 034-8628, Japan
| | - Akio Nakane
- Department of Microbiology and Immunology, Hirosaki University Graduate School of Medicine, Zaifu-cho 5, Hirosaki, Aomori, 036-8562, Japan; Department of Biopolymer and Health Science, Hirosaki University Graduate School of Medicine, Zaifu-cho 5, Hirosaki, Aomori, 036-8562, Japan
| | - Shinji Takai
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Higashi 23-35-1, Towada, Aomori, 034-8628, Japan
| | - Kenji Sadamasu
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Hyakunin-cho 3-24-1, Shinjuku, Tokyo, 169-0073, Japan
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19
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Kubota H, Uwamino Y, Matsui M, Sekizuka T, Suzuki Y, Okuno R, Uchitani Y, Ariyoshi T, Aoki W, Suzuki S, Kuroda M, Shinkai T, Yokoyama K, Sadamasu K, Funakoshi T, Murata M, Hasegawa N, Iwata S. FRI-4 carbapenemase-producing Enterobacter cloacae complex isolated in Tokyo, Japan. J Antimicrob Chemother 2019; 73:2969-2972. [PMID: 30060114 DOI: 10.1093/jac/dky291] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 06/25/2018] [Indexed: 11/13/2022] Open
Abstract
Objectives A carbapenem-resistant Enterobacter cloacae complex isolated in Tokyo, Japan, produced a carbapenemase that was detected by a Carba NP test and a modified carbapenem inactivation method, but none of the 'Big Five' carbapenemase genes was detected by PCR. This study aimed to identify the carbapenemase. Methods Carbapenemase genes were screened by WGS. Next, we generated a recombinant plasmid in which the carbapenemase gene was inserted. We also extracted the carbapenemase gene-carrying plasmid from the E. cloacae complex. The effects of both plasmids on the antibiotic susceptibility of Escherichia coli were then tested. The carbapenemase gene-carrying plasmid in the E. cloacae complex was completely sequenced. Results A novel carbapenemase gene, blaFRI-4, encoded an amino acid sequence that was 93.2% identical to French imipenemase (FRI-1). E. coli transformed with blaFRI-4 showed reduced carbapenem susceptibility. A complete sequence of the blaFRI-4-carrying 98 508 bp IncFII/IncR plasmid (pTMTA61661) showed that blaFRI-4 and the surrounding region (18.7 kb) were duplicated. Conclusions The FRI-4-producing E. cloacae complex was isolated in Japan, whereas all other FRI variants have been found in Europe, suggesting that the spread of FRI carbapenemases is global.
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Affiliation(s)
- Hiroaki Kubota
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, 3-24-1 Hyakunincho, Shinjuku-ku, Tokyo, Japan
| | - Yoshifumi Uwamino
- Department of Laboratory Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, Japan.,Center for Infectious Diseases and Infection Control, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, Japan
| | - Mari Matsui
- Antimicrobial Resistance Research Center, National Institute of Infectious Diseases, 4-2-1 Aoba-cho, Higashimurayama-shi, Tokyo, Japan
| | - Tsuyoshi Sekizuka
- Pathogen Genomics Center, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, Japan
| | - Yasunori Suzuki
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, 3-24-1 Hyakunincho, Shinjuku-ku, Tokyo, Japan
| | - Rumi Okuno
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, 3-24-1 Hyakunincho, Shinjuku-ku, Tokyo, Japan
| | - Yumi Uchitani
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, 3-24-1 Hyakunincho, Shinjuku-ku, Tokyo, Japan
| | - Tsukasa Ariyoshi
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, 3-24-1 Hyakunincho, Shinjuku-ku, Tokyo, Japan
| | - Wataru Aoki
- Department of Laboratory Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, Japan
| | - Satowa Suzuki
- Antimicrobial Resistance Research Center, National Institute of Infectious Diseases, 4-2-1 Aoba-cho, Higashimurayama-shi, Tokyo, Japan
| | - Makoto Kuroda
- Pathogen Genomics Center, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, Japan
| | - Takayuki Shinkai
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, 3-24-1 Hyakunincho, Shinjuku-ku, Tokyo, Japan
| | - Keiko Yokoyama
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, 3-24-1 Hyakunincho, Shinjuku-ku, Tokyo, Japan
| | - Kenji Sadamasu
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, 3-24-1 Hyakunincho, Shinjuku-ku, Tokyo, Japan
| | - Takeru Funakoshi
- Department of Dermatology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, Japan
| | - Mitsuru Murata
- Department of Laboratory Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, Japan
| | - Naoki Hasegawa
- Center for Infectious Diseases and Infection Control, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, Japan
| | - Satoshi Iwata
- Center for Infectious Diseases and Infection Control, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, Japan
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20
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Saburi M, Yamada H, Wada N, Motoyama S, Sugimoto T, Kubota H, Miyawaki D, Wakana N, Matoba S. P732Maternal high-fat diet promotes the expansion of abdominal aortic aneurysm in adult offspring by enhancing osteoclast-like macrophage differentiation. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz747.0336] [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 and objective
Maternal high-fat diet (HFD) has been shown to modulate vascular function and remodeling in adult offspring. Here, we investigated the impact of maternal HFD on abdominal aortic aneurysm (AAA) formation.
Methods and results
Eight-week-old female wild-type mice (C57BL/6) were fed a HFD or normal diet (ND) one week prior to mating and received during pregnancy and lactation. In eight-week-old offspring of both genders, AAA was induced with the application of 0.5M calcium chloride (CaCl2) on the infrarenal aorta. Male offspring of HFD-fed dams (O-HFD) showed a significant increase in maximum outer diameter of AAA at 1, 4 and 8 weeks after surgery compared with offspring of ND-fed dams (O-ND) (P<0.05). The lengths of outer circumference assessed by histological analysis were increased in O-HFD (P<0.05). Likewise, female O-HFD showed a greater length of outer circumference than female O-ND (P<0.05). While the number of F4/80-positive cells at 1 wk after surgery was comparable between the male O-HFD and O-ND, the percentage of MMP-9/F4/80 double-positive cells was significantly increased in male O-HFD. Consistently, fluorescent image of abdominal aorta taken by IVIS at 1 wk after surgery revealed a 2-fold increase in MMP activity (P<0.01). Intriguingly, F4/80-positive cells in male O-HFD showed a 2.5-fold increase in co-staining with tartrate-resistant acid phosphate (TRAP), typical marker of osteoclast-like macrophages which abundantly secrete proteases than classically activated macrophages (M1), while the percentage of TNF-α/F4/80 double-positive cells was comparable between the 2 groups. Pharmacological inhibition of osteoclastogenesis by zoledronic acid (ZA) (100μg/kg) completely abolished the exaggerated AAA development in male O-HFD to a similar extent of that in male O-ND, while AAA development in male O-ND mice did not change even after ZA treatment. Furthermore, in vitro TNF-α-induced osteoclast differentiation of bone marrow-derived macrophages (BMDMs) showed a significantly higher number of TRAP-positive cells, accompanied by increased calcitonin receptor mRNA expression. Western blotting analysis showed that protein expression level of NFATc1, master regulator of osteoclastogenesis, was significantly higher in BMDM of O-HFD than O-ND.
Conclusion
Our findings demonstrate that maternal HFD accelerates CaCl2-induced AAA expansion, accompanied by the exaggerated accumulation of osteoclast-like macrophages and augmented activity of MMPs. Inhibition of macrophages skewing toward osteoclast-like cells could be a potential therapeutic target for preventing AAA development.
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Affiliation(s)
- M Saburi
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - H Yamada
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - N Wada
- Kyoto Chubu medical Center, Department of Cardiology, Kyoto, Japan
| | - S Motoyama
- Kyoto Yamashiro General Medical Center, Kyoto, Japan
| | - T Sugimoto
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - H Kubota
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - D Miyawaki
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - N Wakana
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | - S Matoba
- Kyoto Prefectural University of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
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21
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Sugimoto T, Yamada H, Kubota H, Miyawaki D, Motoyama S, Wada N, Saburi M, Wakana N, Matoba S. P740Repeated social defeat exaggerates fibrin-rich clot formation in FeCl3-induced arterial thrombosis mice model by enhancing NETs formation. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz747.0343] [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 and objective
Depression is an independent risk factor of cardiovascular disease (CVD). We have recently shown that repeated social defeat (RSD) precipitates depressive-like behaviorsin apoE−/− mice and exaggerates atherosclerosis development by enhancing neutrophil extracellular traps (NETs) formation (BBRC 2018; 500:490). Here, we investigated the impact of RSD on arterial thrombosis.
Methods and results
Eight-week-old male WT mice were exposed to RSDby housing with a larger CD-1 mouse in a shared home cage. They were subjected to vigorous physical contact daily for 10 consecutive days. Control mice were housed in the same gage without physical contact. After social interaction testto confirm depressive-like behaviors, defeated mice (19 of 31) and control mice (12 of 14) were underwent arterial injury at 10 wks of age. A filter paper saturated with 10% FeCl3was applied on the adventitial surface of left carotid artery for 3 min and analyzed 3 hrs later. The volume of thrombi calculated by summing8–15 frozen cross-sectional images, each separated by 200 μm, was comparable between the 2 groups. However, fibrinogen/fibrin-positive areas in immunofluorescent images were significantly increased in defeated mice (27.8% vs. 48.8%, Control vs. Defeat, P<0.01).The numberof Ly-6G-positive cells in thrombi was markedly higher in defeated mice (144/mm2 vs. 878/mm2, Control vs. Defeat, P<0.05). Further, Ly-6G-positive cells were almost accumulated at the inner surface of injured artery, which were co-localized with neutrophil elastase, Cit-H3, and CD41-positive staining. Treatment with DNase Icompletely diminished the exaggerated fibrin-rich clot formation in defeated miceto a similar extent of control mice (25.7% vs. 22.3%, Control vs. Defeat, P= NS), while the volume of thrombi and number of Ly-6G-positive cells in thrombi were comparable between the 2 groups even afterDNase I treatment. Platelet aggregations induced by ADP or collagen were comparable between the 2 groups, suggesting that NETs formation primarily contributes to the exaggerated fibrin-rich clot formation in defeated mice.
Conclusions
Our findings demonstrate for the first time that repeated social defeat enhances fibrin-rich clot formation after arterial injury by enhancing NETs formation, suggesting that NETosis could be a new therapeutic target in depression-related CVD development.
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Affiliation(s)
- T Sugimoto
- Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - H Yamada
- Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - H Kubota
- Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - D Miyawaki
- Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - S Motoyama
- Kyoto Yamashiro General Medical Center, Kyoto, Japan
| | - N Wada
- Kyoto Chubu Medical Center, Department of Cardiology, Kyoto, Japan
| | - M Saburi
- Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - N Wakana
- Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - S Matoba
- Kyoto Prefectural University of Medicine, Kyoto, Japan
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22
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Wada N, Yamada H, Motoyama S, Saburi M, Sugimoto T, Miyawaki D, Kubota H, Wakana N, Matoba S. 5220Maternal high-fat diet exaggerates the development of diet-induced insulin resistance in adult offspring by enhancing pyroptosis through augmented gasdermin D-mediated pore formation. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0069] [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
Maternal high-fat diet (HFD) has been shown to promote the development of insulin resistance (IR) in adult offspring; however, the underlying mechanisms remain unclear.
Approach and results
Eight-week-old female wild-type mice (C57BL/6) were fed a HFD or normal diet (ND) one week prior to mating, and received during pregnancy and lactation. Eight-week-old male offspring of both groups were fed a HFD for 8 weeks. Offspring of HFD-fed dams (O-HFD) showed significantly enhanced IR compared with offspring of ND-fed dams (O-ND). There was no difference in body weight, epidydimal white adipose tissue (eWAT) weight, and cumulative caloric intake between the 2 groups. However, eWAT adipocyte size was significantly increased in O-HFD, accompanied by the abundant crown-like structures. Flow cytometric analysis revealed an increased percentage of M1, but not M2, macrophages. Serum and eWAT concentrations of IL-1β, but not TNF-α, were significantly higher in O-HFD than O-ND (3.7-fold and 2.0-fold, respectively, P<0.05). Treatment with NLRP3 inflammasome inhibitor MCC950 completely abrogated the enhanced IR in O-HFD to a similar extent of that in O-ND, although IR was modestly, but not significantly, ameliorated in O-ND even after MCC950 treatment. Consistent with in vivo findings, in vitro polarization of bone marrow-derived macrophages (BMDMs) did not show any difference in TNF-α mRNA expression after conventional stimulation. In contrast, palmitate acid (PA)-mediated metabolic activation of BMDMs following LPS priming showed a significantly higher concentration of IL-1β in culture supernatants from O-HFD (45%, P<0.05). However, protein expression levels of NLRP-3, ASC, and procaspase-1 after LPS priming were equivalent between the 2 groups. Consistently, intracellular flow cytometric analysis of caspase-1 activity after PA activation did not show any difference, which was compatible with the finding that ex vivo caspase-1 activity of eWAT assessed by fluorescent image of IVIS revealed no difference between the 2 groups. To further examine the mechanism of augmented IL-1β release in BMDM of O-HFD, we examined the cleavage of caspase substrate gasdermin D (GSDMD) and subsequent pore formation. Protein and gene expression levels of GSDM-D after LPS priming were significantly higher in O-HFD (50% and 381%, respectively, P<0.05). At 2 hrs after PA stimulation following LPS priming, cleaved GSDM-D was significantly increased in O-HFD (80%, P<0.01). Consistently, percentage of pore formation assessed by ethidium bromide staining was significantly higher in O-HFD (60%, P<0.05), while LDH release could not be observed.
Conclusions
Our findings demonstrate that maternal HFD exaggerates diet-induced insulin resistance in adult offspring by enhancing pyroptosis through augmented GSDM-D-mediated pore formation.
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Affiliation(s)
- N Wada
- Kyoto Chubu Medical Center, Kyoto, Japan
| | - H Yamada
- Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - S Motoyama
- Yamashiro General Medical Center, Kyoto, Japan
| | - M Saburi
- Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - T Sugimoto
- Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - D Miyawaki
- Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - H Kubota
- Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - N Wakana
- Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - S Matoba
- Kyoto Prefectural University of Medicine, Kyoto, Japan
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23
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Uwamino Y, Kubota H, Sasaki T, Kosaka A, Furuhashi M, Uno S, Kudoh J, Murata M, Hasegawa N. Recovery of FRI-5 carbapenemase at a Japanese hospital where FRI-4 carbapenemase was discovered. J Antimicrob Chemother 2019; 74:3390-3392. [DOI: 10.1093/jac/dkz336] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Yoshifumi Uwamino
- Department of Laboratory Medicine, Keio University School of Medicine, Tokyo, Japan
- Department of Infectious Diseases, Keio University School of Medicine, Tokyo, Japan
| | - Hiroaki Kubota
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Takashi Sasaki
- Center for Supercentenarian Medical Research, Keio University School of Medicine, Tokyo, Japan
| | - Asami Kosaka
- Department of Infectious Diseases, Keio University School of Medicine, Tokyo, Japan
| | - Mie Furuhashi
- Laboratory of Gene Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Shunsuke Uno
- Department of Infectious Diseases, Keio University School of Medicine, Tokyo, Japan
| | - Jun Kudoh
- Laboratory of Gene Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Mitsuru Murata
- Department of Laboratory Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Naoki Hasegawa
- Department of Infectious Diseases, Keio University School of Medicine, Tokyo, Japan
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24
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Kubota H, Kawasaki T, Kawamata H, Yamano M, Kamitani T, Miyoshi T. Peripheral Signs of Infective Endocarditis. Circ J 2019; 83:841. [PMID: 30224589 DOI: 10.1253/circj.cj-18-0854] [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: 11/09/2022]
Affiliation(s)
| | | | | | | | | | - Tomoki Miyoshi
- Department of General Internal Medicine, Matsushita Memorial Hospital
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25
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Riou M, Torrejon J, Garitaine B, Araujo FA, Bortolotti P, Cros V, Tsunegi S, Yakushiji K, Fukushima A, Kubota H, Yuasa S, Querlioz D, Stiles MD, Grollier J. Temporal pattern recognition with delayed feedback spin-torque nano-oscillators. Phys Rev Appl 2019; 12:10.1103/physrevapplied.12.024049. [PMID: 32118096 PMCID: PMC7047780 DOI: 10.1103/physrevapplied.12.024049] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The recent demonstration of neuromorphic computing with spin-torque nano-oscillators has opened a path to energy efficient data processing. The success of this demonstration hinged on the intrinsic short-term memory of the oscillators. In this study, we extend the memory of the spin-torque nano-oscillators through time-delayed feedback. We leverage this extrinsic memory to increase the efficiency of solving pattern recognition tasks that require memory to discriminate different inputs. The large tunability of these non-linear oscillators allows us to control and optimize the delayed feedback memory using different operating conditions of applied current and magnetic field.
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Affiliation(s)
- M Riou
- Unité Mixte de Physique CNRS, Thales,Université Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France
| | - J Torrejon
- Unité Mixte de Physique CNRS, Thales,Université Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France
| | - B Garitaine
- Unité Mixte de Physique CNRS, Thales,Université Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France
| | - F Abreu Araujo
- Unité Mixte de Physique CNRS, Thales,Université Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France
| | - P Bortolotti
- Unité Mixte de Physique CNRS, Thales,Université Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France
| | - V Cros
- Unité Mixte de Physique CNRS, Thales,Université Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France
| | - S Tsunegi
- National Institute of Advanced Industrial Science and Technology (AIST), Spintronic Research Center, Tsukuba, Ibaraki 305-8568, Japan
| | - K Yakushiji
- National Institute of Advanced Industrial Science and Technology (AIST), Spintronic Research Center, Tsukuba, Ibaraki 305-8568, Japan
| | - A Fukushima
- National Institute of Advanced Industrial Science and Technology (AIST), Spintronic Research Center, Tsukuba, Ibaraki 305-8568, Japan
| | - H Kubota
- National Institute of Advanced Industrial Science and Technology (AIST), Spintronic Research Center, Tsukuba, Ibaraki 305-8568, Japan
| | - S Yuasa
- National Institute of Advanced Industrial Science and Technology (AIST), Spintronic Research Center, Tsukuba, Ibaraki 305-8568, Japan
| | - D Querlioz
- Center for Nanoscience and Nanotechnology, CNRS, Université Paris-Sud, Université Paris-Saclay, 91405, Orsay, France
| | - M D Stiles
- Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6202, USA
| | - J Grollier
- Unité Mixte de Physique CNRS, Thales,Université Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France
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Kubota H, Tsujino K, Sulaiman N, Sekii S, Matsumoto Y, Ota Y, Yamaguchi S. Clinical Outcome of the Recurrence of Uterine Cervical Cancer in Isolated Para-aortic Lymph Node after Definitive Treatment. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.07.1716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Kubota H, Miyazaki M, Ogawa T, Shimozawa T, Kinosita K, Ishiwata S. Processive Nanostepping of Formin mDia1 Loosely Coupled with Actin Polymerization. Nano Lett 2018; 18:6617-6624. [PMID: 30251858 DOI: 10.1021/acs.nanolett.8b03277] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Formins are actin-binding proteins that construct nanoscale machinery with the growing barbed end of actin filaments and serve as key regulators of actin polymerization and depolymerization. To maintain the regulation of actin dynamics, formins have been proposed to processively move at every association or dissociation of a single actin molecule toward newly formed barbed ends. However, the current models for the motile mechanisms were established without direct observation of the elementary processes of this movement. Here, using optical tweezers, we demonstrate that formin mDia1 moves stepwise, observed at a nanometer spatial resolution. The movement was composed of forward and backward steps with unitary step sizes of 2.8 and -2.4 nm, respectively, which nearly equaled the actin subunit length (∼2.7 nm), consistent with the generally accepted models. However, in addition to steps equivalent to the length of a single actin subunit, those equivalent to the length of two or three subunits were frequently observed. Our findings suggest that the coupling between mDia1 stepping and actin polymerization is not tight but loose, which may be achieved by the multiple binding states of mDia1, providing insights into the synergistic functions of biomolecules for the efficient construction and regulation of nanofilaments.
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Affiliation(s)
- Hiroaki Kubota
- Department of Physics, Faculty of Science and Engineering , Waseda University , 3-4-1 Okubo , Shinjuku-ku, Tokyo 169-8555 , Japan
| | - Makito Miyazaki
- Department of Physics, Faculty of Science and Engineering , Waseda University , 3-4-1 Okubo , Shinjuku-ku, Tokyo 169-8555 , Japan
| | - Taisaku Ogawa
- Department of Physics, Faculty of Science and Engineering , Waseda University , 3-4-1 Okubo , Shinjuku-ku, Tokyo 169-8555 , Japan
| | - Togo Shimozawa
- Department of Life Science and Medical Bioscience, Faculty of Science and Engineering , Waseda University , 2-2 Wakamatsuchou , Shinjuku-ku, Tokyo 162-8480 , Japan
| | - Kazuhiko Kinosita
- Department of Physics, Faculty of Science and Engineering , Waseda University , 3-4-1 Okubo , Shinjuku-ku, Tokyo 169-8555 , Japan
| | - Shin'ichi Ishiwata
- Department of Physics, Faculty of Science and Engineering , Waseda University , 3-4-1 Okubo , Shinjuku-ku, Tokyo 169-8555 , Japan
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Tamaru S, Tsunegi S, Kubota H, Yuasa S. Vector network analyzer ferromagnetic resonance spectrometer with field differential detection. Rev Sci Instrum 2018; 89:053901. [PMID: 29864860 DOI: 10.1063/1.5022762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
This work presents a vector network analyzer ferromagnetic resonance (VNA-FMR) spectrometer with field differential detection. This technique differentiates the S-parameter by applying a small binary modulation field in addition to the DC bias field to the sample. By setting the modulation frequency sufficiently high, slow sensitivity fluctuations of the VNA, i.e., low-frequency components of the trace noise, which limit the signal-to-noise ratio of the conventional VNA-FMR spectrometer, can be effectively removed, resulting in a very clean FMR signal. This paper presents the details of the hardware implementation and measurement sequence as well as the data processing and analysis algorithms tailored for the FMR spectrum obtained with this technique. Because the VNA measures a complex S-parameter, it is possible to estimate the Gilbert damping parameter from the slope of the phase variation of the S-parameter with respect to the bias field. We show that this algorithm is more robust against noise than the conventional algorithm based on the linewidth.
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Affiliation(s)
- S Tamaru
- Spintronics Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
| | - S Tsunegi
- Spintronics Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
| | - H Kubota
- Spintronics Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
| | - S Yuasa
- Spintronics Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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29
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Suzuki Y, Kubota H, Ono HK, Kobayashi M, Murauchi K, Kato R, Hirai A, Sadamasu K. Food poisoning outbreak in Tokyo, Japan caused by Staphylococcus argenteus. Int J Food Microbiol 2017; 262:31-37. [DOI: 10.1016/j.ijfoodmicro.2017.09.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Revised: 06/08/2017] [Accepted: 09/10/2017] [Indexed: 10/18/2022]
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30
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Kubota H, Soejima T, Sekii S, Matsumoto Y, Ota Y, Tsujino K. Predicting Survival of Patients with Bone Metastases Treated with Radiation Therapy; A Validation Study of Katagiri’s scoring system. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.538] [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: 11/26/2022]
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31
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Kubota H, Miyazaki M, Ogawa T, Shimozawa T, Kinosita K, Ishiwata S. Biphasic Effect of Profilin Impacts the Formin mDia1 Force-Sensing Mechanism in Actin Polymerization. Biophys J 2017; 113:461-471. [PMID: 28746856 DOI: 10.1016/j.bpj.2017.06.012] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Revised: 06/07/2017] [Accepted: 06/09/2017] [Indexed: 11/29/2022] Open
Abstract
Formins are force-sensing proteins that regulate actin polymerization dynamics. Here, we applied stretching tension to individual actin filaments under the regulation of formin mDia1 to investigate the mechanical responses in actin polymerization dynamics. We found that the elongation of an actin filament was accelerated to a greater degree by stretching tension for ADP-G-actin than that for ATP-G-actin. An apparent decrease in the critical concentration of G-actin was observed, especially in ADP-G-actin. These results on two types of G-actin were reproduced by a simple kinetic model, assuming the rapid equilibrium between pre- and posttranslocated states of the formin homology domain two dimer. In addition, profilin concentration dramatically altered the force-dependent acceleration of actin filament elongation, which ranged from twofold to an all-or-none response. Even under conditions in which actin depolymerization occurred, applications of a several-piconewton stretching tension triggered rapid actin filament elongation. This extremely high force-sensing mechanism of mDia1 and profilin could be explained by the force-dependent coordination of the biphasic effect of profilin; i.e., an acceleration effect masked by a depolymerization effect became dominant under stretching tension, negating the latter to rapidly enhance the elongation rate. Our findings demonstrate that the biphasic effect of profilin is controlled by mechanical force, thus expanding the function of mDia1 as a mechanosensitive regulator of actin polymerization.
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Affiliation(s)
- Hiroaki Kubota
- Department of Physics, Faculty of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, Japan
| | - Makito Miyazaki
- Department of Physics, Faculty of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, Japan; Waseda Bioscience Research Institute in Singapore (WABIOS), Singapore, Singapore.
| | - Taisaku Ogawa
- Department of Physics, Faculty of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, Japan
| | - Togo Shimozawa
- Department of Life Science and Medical Bioscience, Faculty of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, Japan
| | - Kazuhiko Kinosita
- Department of Physics, Faculty of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, Japan
| | - Shin'ichi Ishiwata
- Department of Physics, Faculty of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, Japan.
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32
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Takeda T, Iwatsuki S, Hamakawa T, Mizuno K, Kamiya H, Umemoto Y, Kubota H, Kubota Y, Sasaki S, Yasui T. Chromosomal anomalies and sperm retrieval outcomes of patients with non-obstructive azoospermia: a case series. Andrology 2017; 5:473-476. [DOI: 10.1111/andr.12338] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2016] [Revised: 12/06/2016] [Accepted: 01/16/2017] [Indexed: 11/26/2022]
Affiliation(s)
- T. Takeda
- Department of Nephro-urology; Nagoya City University Graduate School of Medical Sciences; Nagoya Japan
| | - S. Iwatsuki
- Department of Nephro-urology; Nagoya City University Graduate School of Medical Sciences; Nagoya Japan
| | - T. Hamakawa
- Department of Nephro-urology; Nagoya City University Graduate School of Medical Sciences; Nagoya Japan
| | - K. Mizuno
- Department of Nephro-urology; Nagoya City University Graduate School of Medical Sciences; Nagoya Japan
| | - H. Kamiya
- Department of Nephro-urology; Nagoya City University Graduate School of Medical Sciences; Nagoya Japan
| | - Y. Umemoto
- Department of Nephro-urology; Nagoya City University Graduate School of Medical Sciences; Nagoya Japan
| | - H. Kubota
- Department of Nephro-urology; Nagoya City University Graduate School of Medical Sciences; Nagoya Japan
| | - Y. Kubota
- Department of Nephro-urology; Nagoya City University Graduate School of Medical Sciences; Nagoya Japan
| | - S. Sasaki
- Department of Nephro-urology; Nagoya City University Graduate School of Medical Sciences; Nagoya Japan
| | - T. Yasui
- Department of Nephro-urology; Nagoya City University Graduate School of Medical Sciences; Nagoya Japan
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Riou M, Araujo FA, Torrejon J, Tsunegi S, Khalsa G, Querlioz D, Bortolotti P, Cros V, Yakushiji K, Fukushima A, Kubota H, Yuasa S, Stiles MD, Grollier J. Neuromorphic Computing through Time-Multiplexing with a Spin-Torque Nano-Oscillator. IEEE Trans Electron Devices 2017; IEDM 2017:10.1109/IEDM.2017.8268505. [PMID: 31080272 PMCID: PMC6508600 DOI: 10.1109/iedm.2017.8268505] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Fabricating powerful neuromorphic chips the size of a thumb requires miniaturizing their basic units: synapses and neurons. The challenge for neurons is to scale them down to submicrometer diameters while maintaining the properties that allow for reliable information processing: high signal to noise ratio, endurance, stability, reproducibility. In this work, we show that compact spin-torque nano-oscillators can naturally implement such neurons, and quantify their ability to realize an actual cognitive task. In particular, we show that they can naturally implement reservoir computing with high performance and detail the recipes for this capability.
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Affiliation(s)
- M Riou
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, France
| | - F Abreu Araujo
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, France
| | - J Torrejon
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, France
| | - S Tsunegi
- National Institute of Advanced Industrial Science and Technology (AIST), Spintronics Research Center, Tsukuba, Japan
| | - G Khalsa
- Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD, USA
| | - D Querlioz
- Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris-Sud, Université Paris-Saclay, France
| | - P Bortolotti
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, France
| | - V Cros
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, France
| | - K Yakushiji
- National Institute of Advanced Industrial Science and Technology (AIST), Spintronics Research Center, Tsukuba, Japan
| | - A Fukushima
- National Institute of Advanced Industrial Science and Technology (AIST), Spintronics Research Center, Tsukuba, Japan
| | - H Kubota
- National Institute of Advanced Industrial Science and Technology (AIST), Spintronics Research Center, Tsukuba, Japan
| | - S Yuasa
- National Institute of Advanced Industrial Science and Technology (AIST), Spintronics Research Center, Tsukuba, Japan
| | - M D Stiles
- Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD, USA
| | - J Grollier
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, France
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Tsujino K, Kubota H, Kawaguchi H, Matsumoto Y, Ota Y, Soejima T. Risk Factors Associated With Fatal Radiation Pneumonitis after Concurrent Chemoradiation Therapy for Non-Small Cell Lung Cancer. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Shinomiya H, Seto K, Kawase J, Arikawa K, Funatogawa K, Suzuki M, Kubota H, Shirabe K. [Current status of bacteriological studies at prefectural and municipal public health institutes in Japan]. Nihon Saikingaku Zasshi 2016; 70:309-18. [PMID: 26028211 DOI: 10.3412/jsb.70.309] [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: 11/23/2022]
Abstract
Prefectural and municipal public health institutes are located in prefectures and ordinance-designated cities in Japan, and play a vital role in the regional surveillance of infectious diseases and foodborne illnesses. These institutes, in close cooperation with national institutes such as the National Institute of Infectious Diseases and the National Institute of Health Sciences, construct the national surveillance network for infectious diseases and their causative agents. Bacteriological examinations and studies on a variety of infectious diseases and foodborne illnesses are core activities of prefectural and municipal public health institutes, through which novel and important bacteriological findings have been acquired. In this article, we report the latest findings regarding bacteriological examinations/studies and interesting cases at these institutes, especially concerning foodborne illnesses, tuberculosis, and antimicrobial resistances.
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Affiliation(s)
- Hiroto Shinomiya
- Ehime Prefectural Institute of Public Health and Environmental Science
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36
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Suzuki Y, Matsushita S, Kubota H, Kobayashi M, Murauchi K, Higuchi Y, Kato R, Hirai A, Sadamasu K. Identification and functional activity of a staphylocoagulase type XI variant originating from staphylococcal food poisoning isolates. Lett Appl Microbiol 2016; 63:172-7. [PMID: 27227969 DOI: 10.1111/lam.12595] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Revised: 05/23/2016] [Accepted: 05/23/2016] [Indexed: 11/26/2022]
Abstract
UNLABELLED Staphylocoagulase, an extracellular protein secreted by Staphylococcus aureus, has been used as an epidemiological marker. At least 12 serotypes and 24 genotypes subdivided on the basis of nucleotide sequence have been reported to date. In this study, we identified a novel staphylocoagulase nucleotide sequence, coa310, from staphylococcal food poisoning isolates that had the ability to coagulate plasma, but could not be typed using the conventional method. The protein encoded by coa310 contained the six fundamental conserved domains of staphylocoagulase. The full-length nucleotide sequence of coa310 shared the highest similarity (77·5%) with that of staphylocoagulase-type (SCT) XIa. The sequence of the D1 region, which would be responsible for the determination of SCT, shared the highest similarity (91·8%) with that of SCT XIa. These results suggest that coa310 is a novel variant of SCT XI. Moreover, we demonstrated that coa310 encodes a functioning coagulase, by confirming the coagulating activity of the recombinant protein expressed from coa310. This is the first study to directly demonstrate that Coa310, a putative SCT XI, has coagulating activity. These findings may be useful for the improvement of the staphylocoagulase-typing method, including serotyping and genotyping. SIGNIFICANCE AND IMPACT OF THE STUDY This is the first study to identify a novel variant of staphylocoagulase type XI based on its nucleotide sequence and to demonstrate coagulating activity in the variant using a recombinant protein. Elucidation of the variety of staphylocoagulases will provide suggestions for further improvement of the staphylocoagulase-typing method and contribute to our understanding of the epidemiologic characterization of Staphylococcus aureus.
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Affiliation(s)
- Y Suzuki
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - S Matsushita
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - H Kubota
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - M Kobayashi
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - K Murauchi
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - Y Higuchi
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - R Kato
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - A Hirai
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - K Sadamasu
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
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37
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Matsumoto M, Ozaki Y, Kubota H, Asai Y, Kanamori H. Equivalent Spatial Frequency and Optimum Film Densities for the Perceptibility of Radiographic Contrast of Step-Edge images. ACTA ACUST UNITED AC 2016. [DOI: 10.1080/00223638.1995.11738627] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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38
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Ozaki Y, Kubota H, Matsumoto M, Kanamori H. Frequency Dependence of Minimum Perceptible Contrasts of Radiographs and MTF of the Eye. ACTA ACUST UNITED AC 2016. [DOI: 10.1080/00223638.1993.11738496] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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39
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Minami M, Katsumata M, Miyake K, Inagaki H, Fan XH, Kubota H, Yamano Y, Kimura O. Dangerous Mixture of Household Detergents in an Old-style Toilet: a Case Report with Simulation Experiments of the Working Environment and Warning of Potential Hazard Relevant to the General Environment. Hum Exp Toxicol 2016; 11:27-34. [PMID: 1354456 DOI: 10.1177/096032719201100104] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
A housewife cleaned toilet porcelain connected directly to a sewage storage tank with a mixture of cleaning agents; sodium hypochlorite (NaOCl) and hydrochloric acid (HCl) solutions. She complained of insomnia on the night after cleaning and suffered from severe metabolic acidosis with extremely low blood pH, PCO2 and bicarbonate values. She recovered from the acidosis after bicarbonate transfusion, plasmapheresis and plasma exchange. Permanent blindness ensued, however, from the third day after the event. These clinical symptoms suggested that the toxic substances responsible were chloramine and methyl chloride. Their generation was confirmed by in-vitro experiments, mixing NaOCl, HCl and pooled urine from normal people. In the simulation, the methyl chloride level far exceeded (100 000 ppm) the maximal allowable concentration recommended (ca 400 ppm) by the American Conference of Governmental Industrial Hygienists (ACGIH). Chloramine's toxic actions were confirmed using purified enzyme assay, and the inhibition of carbonic anhydrase and aldehyde dehydrogenase and the enhancement of superoxide dismutase activity were confirmed in neutral pH. The patient's clinical symptoms suggested that insomnia and permanent blindness seemed to be partly ascribable to chronic repetitive exposure to methyl chloride; catching a cold, drug intake and alcohol intake, in addition, precipitated the patient's visual loss. The possibility of this kind of intoxication with such a mixture of agents may lie latent in any situation where sewage or garbage are exposed to the open air.
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Affiliation(s)
- M Minami
- Department of Hygiene and Public Health, Nippon Medical School, Tokyo, Japan
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40
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Kobayashi Y, Akiyama H, Huge J, Kubota H, Chikazawa S, Satoh T, Miyake T, Uhara H, Okuyama R, Nakagawara R, Aihara M, Hamada-Sato N. Fish collagen is an important panallergen in the Japanese population. Allergy 2016; 71:720-3. [PMID: 26785247 DOI: 10.1111/all.12836] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/04/2016] [Indexed: 12/01/2022]
Abstract
Collagen was identified as a fish allergen in early 2000s. Although its allergenic potential has been suggested to be low, risks associated with collagen as a fish allergen have not been evaluated to a greater extent. In this study, we aimed to clarify the importance of collagen as a fish allergen. Our results showed that 50% of Japanese patients with fish allergy had immunoglobulin E (IgE) against mackerel collagen, whereas 44% had IgE against mackerel parvalbumin. IgE inhibition assay revealed high cross-reactivity of mackerel collagen to 22 fish species (inhibition rates: 87-98%). Furthermore, a recently developed allergy test demonstrated that collagen triggered IgE cross-linking on mast cells. These data indicate that fish collagen is an important and very common panallergen in fish consumed in Japan. The high rate of individuals' collagen allergy may be attributable to the traditional Japanese custom of raw fish consumption.
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Affiliation(s)
- Y. Kobayashi
- Department of Marine Biosciences; Tokyo University of Marine Science and Technology; Minato-ku Tokyo Japan
- Course of Safety Management in Food Supply Chain; Tokyo University of Marine Science and Technology; Minato-ku Tokyo Japan
| | - H. Akiyama
- Chemistry Division; Kanagawa Prefectural Institute of Public Health; Chigasaki-shi Kanagawa Japan
| | - J. Huge
- Course of Safety Management in Food Supply Chain; Tokyo University of Marine Science and Technology; Minato-ku Tokyo Japan
| | - H. Kubota
- Course of Safety Management in Food Supply Chain; Tokyo University of Marine Science and Technology; Minato-ku Tokyo Japan
| | - S. Chikazawa
- Department of Dermatology; National Defense Medical College; Tokorozawa-shi Saitama Japan
| | - T. Satoh
- Department of Dermatology; National Defense Medical College; Tokorozawa-shi Saitama Japan
| | - T. Miyake
- Department of Dermatology; Shinshu University Hospital; Matsumoto-shi Nagano Japan
| | - H. Uhara
- Department of Dermatology; Shinshu University Hospital; Matsumoto-shi Nagano Japan
| | - R. Okuyama
- Department of Dermatology; Shinshu University Hospital; Matsumoto-shi Nagano Japan
| | - R. Nakagawara
- Department of Dermatology; Yokohama City University School of Medicine; Yokohama-shi Kanagawa Japan
| | - M. Aihara
- Department of Dermatology; Yokohama City University School of Medicine; Yokohama-shi Kanagawa Japan
| | - N. Hamada-Sato
- Department of Marine Biosciences; Tokyo University of Marine Science and Technology; Minato-ku Tokyo Japan
- Course of Safety Management in Food Supply Chain; Tokyo University of Marine Science and Technology; Minato-ku Tokyo Japan
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41
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Jenkins AS, Lebrun R, Grimaldi E, Tsunegi S, Bortolotti P, Kubota H, Yakushiji K, Fukushima A, de Loubens G, Klein O, Yuasa S, Cros V. Spin-torque resonant expulsion of the vortex core for an efficient radiofrequency detection scheme. Nat Nanotechnol 2016; 11:360-364. [PMID: 26727200 DOI: 10.1038/nnano.2015.295] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Accepted: 11/17/2015] [Indexed: 06/05/2023]
Abstract
It has been proposed that high-frequency detectors based on the so-called spin-torque diode effect in spin transfer oscillators could eventually replace conventional Schottky diodes due to their nanoscale size, frequency tunability and large output sensitivity. Although a promising candidate for information and communications technology applications, the output voltage generated from this effect has still to be improved and, more pertinently, reduces drastically with decreasing radiofrequency (RF) current. Here we present a scheme for a new type of spintronics-based high-frequency detector based on the expulsion of the vortex core in a magnetic tunnel junction (MTJ). The resonant expulsion of the core leads to a large and sharp change in resistance associated with the difference in magnetoresistance between the vortex ground state and the final C-state configuration. Interestingly, this reversible effect is independent of the incoming RF current amplitude, offering a fast real-time RF threshold detector.
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Affiliation(s)
- A S Jenkins
- Unité Mixte de Physique CNRS/Thales and Université Paris Sud, 91767 Palaiseau, France
| | - R Lebrun
- Unité Mixte de Physique CNRS/Thales and Université Paris Sud, 91767 Palaiseau, France
| | - E Grimaldi
- Unité Mixte de Physique CNRS/Thales and Université Paris Sud, 91767 Palaiseau, France
| | - S Tsunegi
- Unité Mixte de Physique CNRS/Thales and Université Paris Sud, 91767 Palaiseau, France
- Institute of Advanced Industrial Science and Technology (AIST), Spintronics Research Center, Tsukuba, 305-8560 Japan
| | - P Bortolotti
- Unité Mixte de Physique CNRS/Thales and Université Paris Sud, 91767 Palaiseau, France
| | - H Kubota
- Institute of Advanced Industrial Science and Technology (AIST), Spintronics Research Center, Tsukuba, 305-8560 Japan
| | - K Yakushiji
- Institute of Advanced Industrial Science and Technology (AIST), Spintronics Research Center, Tsukuba, 305-8560 Japan
| | - A Fukushima
- Institute of Advanced Industrial Science and Technology (AIST), Spintronics Research Center, Tsukuba, 305-8560 Japan
| | - G de Loubens
- Service de Physique de l'Etat Condensé (CNRS URA 2464), CEA Saclay, 91191 Gif-sur-Yvette, France
| | - O Klein
- Service de Physique de l'Etat Condensé (CNRS URA 2464), CEA Saclay, 91191 Gif-sur-Yvette, France
| | - S Yuasa
- Institute of Advanced Industrial Science and Technology (AIST), Spintronics Research Center, Tsukuba, 305-8560 Japan
| | - V Cros
- Unité Mixte de Physique CNRS/Thales and Université Paris Sud, 91767 Palaiseau, France
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Sakai T, Kubota H, Gawad A, Gheyle L, Ramael S, Oishi K. Effect of fermented milk containing Lactobacillus casei strain Shirota on constipation-related symptoms and haemorrhoids in women during puerperium. Benef Microbes 2016; 6:253-62. [PMID: 25380801 DOI: 10.3920/bm2014.0076] [Citation(s) in RCA: 14] [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] [Indexed: 01/19/2023]
Abstract
Constipation and haemorrhoids are common complaints after childbirth. The objective of this pilot study was to evaluate impact of fermented milk containing Lactobacillus casei strain Shirota (LcS) on stool consistency and frequency, constipation-related symptoms and quality of life, and incidence of haemorrhoids in women during puerperium. Forty women who had natural childbirth were randomised to group consuming either one bottle/day of fermented milk containing at least 6.5×109 cfu of LcS, or placebo, for 6 weeks after childbirth. Subjects filled in a diary on their bowel habits including number of bowel movement, stool consistency and incidence of haemorrhoids, and answered questionnaires on constipation-related symptoms (PAC-SYM) and quality of life (PAC-QOL) during the study period. The probiotic group showed the better scores on overall PAC-SYM (P=0.013), PAC-SYM subscales of abdominal symptoms (P=0.043) and rectal symptoms (P=0.031), and PAC-QOL satisfaction subscale (P=0.037) in comparison with the placebo group. In the probiotic group, two to four subjects experienced haemorrhoids during the first 3 weeks of treatment. The number decreased in week 4 and no one had haemorrhoids on most days in week 5-6. In the placebo group, on average four subjects had haemorrhoids from the beginning, and no obvious change was observed until week 6. No statistically significant effect was observed on stool consistency and frequency. The study products did not cause any adverse event in the subjects. Results of this study indicate that continuous consumption of fermented milk containing LcS might alleviate constipation-related symptoms, provide satisfactory bowel habit and result in earlier recovery from haemorrhoids in women during puerperium. Nonetheless, there are several limitations in interpretation of the results attributed to the study design, including lack of baseline data. Further study is required in order to confirm the efficacy.
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Affiliation(s)
- T Sakai
- Yakult Honsha European Research Center for Microbiology ESV, Technologiepark 4, 9052 Zwijnaarde, Belgium Yakult Central Institute, 5-11 Izumi, Kunitachi-shi, Tokyo, 186-8650 Japan
| | - H Kubota
- Yakult Honsha European Research Center for Microbiology ESV, Technologiepark 4, 9052 Zwijnaarde, Belgium Yakult Central Institute, 5-11 Izumi, Kunitachi-shi, Tokyo, 186-8650 Japan
| | - A Gawad
- Yakult Honsha European Research Center for Microbiology ESV, Technologiepark 4, 9052 Zwijnaarde, Belgium
| | - L Gheyle
- SGS Life Science Services, Clinical Pharmacology Unit Antwerpen, Lange Beeldekensstraat 267, 2060 Antwerp, Belgium
| | - S Ramael
- SGS Life Science Services, Clinical Pharmacology Unit Antwerpen, Lange Beeldekensstraat 267, 2060 Antwerp, Belgium
| | - K Oishi
- Yakult Honsha European Research Center for Microbiology ESV, Technologiepark 4, 9052 Zwijnaarde, Belgium Yakult Central Institute, 5-11 Izumi, Kunitachi-shi, Tokyo, 186-8650 Japan
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Makino H, Martin R, Ishikawa E, Gawad A, Kubota H, Sakai T, Oishi K, Tanaka R, Ben-Amor K, Knol J, Kushiro A. Multilocus sequence typing of bifidobacterial strains from infant’s faeces and human milk: are bifidobacteria being sustainably shared during breastfeeding? Benef Microbes 2015; 6:563-72. [DOI: 10.3920/bm2014.0082] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Bifidobacteria are considered to be one of the most important beneficial intestinal bacteria for infants, contributing to the priming of the mucosal immune system. These microbes can also be detected in mother’s milk, suggesting a potential role of human milk in the colonisation of infant’s gut. However, little is known about the timing of bacteria appearance in human milk, and whether human milk is the first source of inoculation. Here, we investigated whether specific strains are shared sustainably between maternal milk and infant’s gut. Faecal samples and human milk were collected from 102 healthy mother-infant pairs (infant’s faeces: meconium, 7, 30 days of age; mother’s milk: once before delivery, colostrum, 7, 30 days after delivery). Bifidobacterial strains were isolated from these samples, and were discriminated by means of multilocus sequencing typing. No bifidobacteria were detected from human milk collected before delivery, or colostrum. Strains were isolated only from human milk samples obtained 7 days after birth or later. On the other hand, bifidobacterial strains were obtained from infant’s faeces throughout the study period, sometimes as early as the first day of life (meconium). We have found that bifidobacterial species belonging to Bifidobacterium bifidum, Bifidobacterium breve, and Bifidobacterium longum subsp. longum could be identified as monophyletic between infant’s faeces and their mother’s milk. These strains were confirmed to be sustainably shared between maternal milk and infant’s gut. Moreover, monophyletic strains were isolated at the same time point or earlier from infant’s faeces than from human milk, and none were isolated earlier from human milk than from infant’s faeces. Although it remains unclear whether human milk is the first source of microbes for infants, our results confirm that human milk is a reservoir of bifidobacteria, and specific strains are shared between infant’s intestine and human milk during breastfeeding.
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Affiliation(s)
- H. Makino
- Yakult Central Institute, 5-11 Izumi, Kunitachi-shi, Tokyo 186-8650, Japan
| | - R. Martin
- Nutricia Research, Uppsalalaan 12, Utrecht Science Park, 3584 CT Utrecht, the Netherlands
| | - E. Ishikawa
- Yakult Central Institute, 5-11 Izumi, Kunitachi-shi, Tokyo 186-8650, Japan
| | - A. Gawad
- Yakult Honsha European Research Center for Microbiology, ESV, Technologiepark 4, 9052 Gent-Zwijnaarde, Belgium
| | - H. Kubota
- Yakult Central Institute, 5-11 Izumi, Kunitachi-shi, Tokyo 186-8650, Japan
| | - T. Sakai
- Yakult Central Institute, 5-11 Izumi, Kunitachi-shi, Tokyo 186-8650, Japan
| | - K. Oishi
- Yakult Central Institute, 5-11 Izumi, Kunitachi-shi, Tokyo 186-8650, Japan
- Yakult Honsha European Research Center for Microbiology, ESV, Technologiepark 4, 9052 Gent-Zwijnaarde, Belgium
| | - R. Tanaka
- Yakult Central Institute, 5-11 Izumi, Kunitachi-shi, Tokyo 186-8650, Japan
| | - K. Ben-Amor
- Nutricia Research Singapore, 30 Biopolis Street, Matrix Building #05/01B, 138671 Singapore
| | - J. Knol
- Nutricia Research, Uppsalalaan 12, Utrecht Science Park, 3584 CT Utrecht, the Netherlands
- Laboratory of Microbiology, Wageningen University, Droevendaalsesteeg 4, 6708 PB Wageningen, the Netherlands
| | - A. Kushiro
- Yakult Central Institute, 5-11 Izumi, Kunitachi-shi, Tokyo 186-8650, Japan
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Lebrun R, Jenkins A, Dussaux A, Locatelli N, Tsunegi S, Grimaldi E, Kubota H, Bortolotti P, Yakushiji K, Grollier J, Fukushima A, Yuasa S, Cros V. Understanding of Phase Noise Squeezing Under Fractional Synchronization of a Nonlinear Spin Transfer Vortex Oscillator. Phys Rev Lett 2015; 115:017201. [PMID: 26182117 DOI: 10.1103/physrevlett.115.017201] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Indexed: 06/04/2023]
Abstract
We investigate experimentally the synchronization of vortex based spin transfer nano-oscillators to an external rf current whose frequency is at multiple integers, as well as at an integer fraction, of the oscillator frequency. Through a theoretical study of the locking mechanism, we highlight the crucial role of both the symmetries of the spin torques and the nonlinear properties of the oscillator in understanding the phase locking mechanism. In the locking regime, we report a phase noise reduction down to -90 dBc/Hz at 1 kHz offset frequency. Our demonstration that the phase noise of these nanoscale nonlinear oscillators can be tuned and eventually lessened, represents a key achievement for targeted radio frequency applications using spin torque devices.
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Affiliation(s)
- R Lebrun
- Unité Mixte de Physique CNRS/Thales and Université Paris Sud, 1 Avenue Fresnel, 91767 Palaiseau, France
| | - A Jenkins
- Unité Mixte de Physique CNRS/Thales and Université Paris Sud, 1 Avenue Fresnel, 91767 Palaiseau, France
| | - A Dussaux
- Unité Mixte de Physique CNRS/Thales and Université Paris Sud, 1 Avenue Fresnel, 91767 Palaiseau, France
| | - N Locatelli
- Unité Mixte de Physique CNRS/Thales and Université Paris Sud, 1 Avenue Fresnel, 91767 Palaiseau, France
| | - S Tsunegi
- Unité Mixte de Physique CNRS/Thales and Université Paris Sud, 1 Avenue Fresnel, 91767 Palaiseau, France
- National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - E Grimaldi
- Unité Mixte de Physique CNRS/Thales and Université Paris Sud, 1 Avenue Fresnel, 91767 Palaiseau, France
| | - H Kubota
- National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - P Bortolotti
- Unité Mixte de Physique CNRS/Thales and Université Paris Sud, 1 Avenue Fresnel, 91767 Palaiseau, France
| | - K Yakushiji
- National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - J Grollier
- Unité Mixte de Physique CNRS/Thales and Université Paris Sud, 1 Avenue Fresnel, 91767 Palaiseau, France
| | - A Fukushima
- National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - S Yuasa
- National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - V Cros
- Unité Mixte de Physique CNRS/Thales and Université Paris Sud, 1 Avenue Fresnel, 91767 Palaiseau, France
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Suzuki Y, Kubota H, Sato'o Y, Ono H, Kato R, Sadamasu K, Kai A, Kamata Y. Identification and characterization of novel Staphylococcus aureus
pathogenicity islands encoding staphylococcal enterotoxins originating from staphylococcal food poisoning isolates. J Appl Microbiol 2015; 118:1507-20. [DOI: 10.1111/jam.12786] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Revised: 02/20/2015] [Accepted: 02/24/2015] [Indexed: 11/28/2022]
Affiliation(s)
- Y. Suzuki
- Department of Veterinary Medicine; Faculty of Agriculture; Iwate University; Morioka City Iwate Japan
- The United Graduate School of Veterinary Sciences; Gifu University; Gifu City Gifu Japan
- Department of Microbiology; Tokyo Metropolitan Institute of Public Health; Shinjuku-ku Tokyo Japan
| | - H. Kubota
- Department of Microbiology; Tokyo Metropolitan Institute of Public Health; Shinjuku-ku Tokyo Japan
| | - Y. Sato'o
- Department of Bacteriology; Hiroshima University Graduate School of Biomedical and Health Sciences; Hiroshima City Hiroshima Japan
| | - H.K. Ono
- Department of Microbiology and Immunology; Hirosaki University Graduate School of Medicine; Hirosaki City Aomori Japan
| | - R. Kato
- Department of Microbiology; Tokyo Metropolitan Institute of Public Health; Shinjuku-ku Tokyo Japan
| | - K. Sadamasu
- Department of Microbiology; Tokyo Metropolitan Institute of Public Health; Shinjuku-ku Tokyo Japan
| | - A. Kai
- Department of Microbiology; Tokyo Metropolitan Institute of Public Health; Shinjuku-ku Tokyo Japan
| | - Y. Kamata
- Department of Veterinary Medicine; Faculty of Agriculture; Iwate University; Morioka City Iwate Japan
- The United Graduate School of Veterinary Sciences; Gifu University; Gifu City Gifu Japan
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Kubota H, Okuno R, Hatakeyama K, Sadamasu K, Hidai H, Fujita A, Kai A. [Isolation of Neisseria elongata subsp. elongata Isolated from an Acute Myelogenous Leukemia Patient]. Kansenshogaku Zasshi 2015; 89:10-15. [PMID: 26548291 DOI: 10.11150/kansenshogakuzasshi.89.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Gram-negative cocci with a rod-like shape were isolated from a blood sample of a patient with acute myelogenous leukemia (AML). The 16S rRNA sequence of the isolate was similar to that of Neisseria elongata. Because previous reports about N. elongata as a pathogen have been extremely rare, more reliable identification seemed to be needed. We thus additionally performed a Multilocus Sequencing Analysis (MLSA) based on another four regions (argF, rho, recA, glnA), and confirmed the identification of N. elongata. The results from the MLSA identified the species; however, we could not identify the isolates into subspecies from the sequences. Three subspecies of N. elongata (N. elongata subsp. elongata, N. elongata subsp. glycolytica and N. elongata subsp. nitroreducens) were classified based on three definitive characteristics (catalase possession, nitrite reducibility, and acid from glucose). The results of the tests of three characteristics supported the identification of the isolate as N. elongata subsp. elongata. Therefore we determined the isolate from the AML patient to be N. elongata subsp. elongata.
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Kubota H, Okuno R, Hatakeyama K, Uchitani Y, Sadamasu K, Hirai A, Kai A. Molecular Typing of Mycoplasma pneumoniae Isolated from Pediatric Patients in Tokyo, Japan. Jpn J Infect Dis 2015; 68:76-8. [DOI: 10.7883/yoken.jjid.2014.336] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Hiroaki Kubota
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health
| | - Rumi Okuno
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health
| | - Kaoru Hatakeyama
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health
| | - Yumi Uchitani
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health
| | - Kenji Sadamasu
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health
| | - Akihiko Hirai
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health
| | - Akemi Kai
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health
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Kubota H, Endo H, Noma M, Tsuchiya H, Takahashi Y, Inaba Y, Nishino Y, Tsuboi A. 327-I * XENOPERICARDIAL ROLL GRAFT REPLACEMENT TO TREAT INFECTIOUS PSEUDOANEURYSM OR GRAFT INFECTION OF THORACIC AND THORACO-ABDOMINAL AORTA. Interact Cardiovasc Thorac Surg 2014. [DOI: 10.1093/icvts/ivu276.327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Kubota H, Kuwabara K, Hamada Y. Prediction of mean skin temperature for use as a heat strain scale by introducing an equation for sweating efficiency. Int J Biometeorol 2014; 58:1593-1603. [PMID: 24305992 DOI: 10.1007/s00484-013-0763-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2012] [Revised: 09/09/2013] [Accepted: 10/28/2013] [Indexed: 06/02/2023]
Abstract
The present paper made the heat balance equation (HBE) for nude or minimally clad subjects a linear function of mean skin temperature (t(sk)) by applying new equations for sweating efficiency (η(sw)) and thermoregulatory sweat rate (S(wR)). As the solution of the HBE, the equation predicting t(sk) was derived and used for a heat strain scale of subjects. The η(sw) was proportional to the reciprocal of S(w)/E(max) (S(w), sweat rate; E(max) maximum evaporative capacity) and the S(wR) was proportional to t(sk) with a parameter of the sweating capacity of the subject. The errors of predicted t(sk) from observations due to the approximation of η(sw) were examined based on experimental data conducted on eight young male subjects. The value of errors of t(sk) was -0.10 ± 0.42 °C (mean ± sample standard deviation (SSD)). We aim to apply the predicted t(sk) of a subject at a level of sweating capacity as a heat strain scale of a function of four environmental factors (dry- and wet-bulb temperatures, radiation, and air velocity) and three human factors (metabolic rate, sweating capacity, and clothing (≤0.2clo)).
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Affiliation(s)
- H Kubota
- Faculty of Engineering, Hokkaido University, N13, W8, Sapporo, 060-8628, Japan,
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Kubota H, Ogo A, Kawai A, Matsumoto H, Nakamura M, Hirai T. PP069-MON: The Suppressive Effect on Chemotaxis of Eicosapentaenoic Acid on TE-1 Cells. Clin Nutr 2014. [DOI: 10.1016/s0261-5614(14)50404-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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