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Okutani A, Taira M, Iida S, Park ES, Tokuyoshi M, Watari Y, Suzuki T, Maeda K. Draft genome sequence of Yersinia pseudotuberculosis isolated from a wild rat in Japan. Microbiol Resour Announc 2024:e0126923. [PMID: 38597639 DOI: 10.1128/mra.01269-23] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 03/17/2024] [Indexed: 04/11/2024] Open
Abstract
We report a draft genome sequence of Yersinia pseudotuberculosis isolated from the spleen of a wild rat from Mikura-shima Island, Japan. The bacterium was identified as serotype O:4b using PCR-based O-genotyping. These genomic data provide insights into the pathogenic potential of this strain in spontaneous outbreaks among wild animals.
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Affiliation(s)
- Akiko Okutani
- Department of Veterinary Science, National Institute of Infectious Diseases, Tokyo, Japan
| | - Masakatsu Taira
- Department of Veterinary Science, National Institute of Infectious Diseases, Tokyo, Japan
| | - Shun Iida
- Department of Pathology, National Institute of Infectious Diseases, Tokyo, Japan
| | - Eun-Sil Park
- Department of Veterinary Science, National Institute of Infectious Diseases, Tokyo, Japan
| | - Mikuni Tokuyoshi
- Graduate School of Agriculture and Life Science, The University of Tokyo, Tokyo, Japan
| | - Yuya Watari
- Forestry and Forest Products Research Institute, Ibaraki, Japan
| | - Tadaki Suzuki
- Department of Pathology, National Institute of Infectious Diseases, Tokyo, Japan
| | - Ken Maeda
- Department of Veterinary Science, National Institute of Infectious Diseases, Tokyo, Japan
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Ishijima K, Phichitraslip T, Naimon N, Ploypichai P, Kriebkajon B, Chinarak T, Sridaphan J, Kritiyakan A, Prasertsincharoen N, Jittapalapong S, Tangcham K, Rerkamnuaychoke W, Kuroda Y, Taira M, Tatemoto K, Park E, Virhuez-Mendoza M, Inoue Y, Harada M, Yamamoto T, Nishino A, Matsuu A, Maeda K. High Seroprevalence of Severe Fever with Thrombocytopenia Syndrome Virus Infection among the Dog Population in Thailand. Viruses 2023; 15:2403. [PMID: 38140644 PMCID: PMC10747823 DOI: 10.3390/v15122403] [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: 10/27/2023] [Revised: 12/06/2023] [Accepted: 12/07/2023] [Indexed: 12/24/2023] Open
Abstract
Severe fever with thrombocytopenia syndrome (SFTS) is an emerging tick-borne zoonotic disease caused by the SFTS virus (SFTSV). In Thailand, three human cases of SFTS were reported in 2019 and 2020, but there was no report of SFTSV infection in animals. Our study revealed that at least 16.6% of dogs in Thailand were seropositive for SFTSV infection, and the SFTSV-positive dogs were found in several districts in Thailand. Additionally, more than 70% of the serum samples collected at one shelter possessed virus-neutralization antibodies against SFTSV and the near-complete genome sequences of the SFTSV were determined from one dog in the shelter. The dog SFTSV was genetically close to those from Thailand and Chinese patients and belonged to genotype J3. These results indicated that SFTSV has already spread among animals in Thailand.
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Affiliation(s)
- Keita Ishijima
- Department of Veterinary Science, National Institute of Infectious Diseases (NIID), Tokyo 162-8640, Japan; (K.I.); (Y.K.); (M.T.); (K.T.); (E.P.); (M.V.-M.); (Y.I.); (M.H.); (T.Y.); (A.N.); (A.M.)
| | - Thanmaporn Phichitraslip
- Faculty of Veterinary Technology, Kasetsart University, Bangkok 10900, Thailand; (T.P.); (N.N.); (P.P.); (B.K.); (T.C.); (J.S.); (A.K.); (N.P.); (S.J.)
| | - Nattakarn Naimon
- Faculty of Veterinary Technology, Kasetsart University, Bangkok 10900, Thailand; (T.P.); (N.N.); (P.P.); (B.K.); (T.C.); (J.S.); (A.K.); (N.P.); (S.J.)
| | - Preeyaporn Ploypichai
- Faculty of Veterinary Technology, Kasetsart University, Bangkok 10900, Thailand; (T.P.); (N.N.); (P.P.); (B.K.); (T.C.); (J.S.); (A.K.); (N.P.); (S.J.)
| | - Benyapa Kriebkajon
- Faculty of Veterinary Technology, Kasetsart University, Bangkok 10900, Thailand; (T.P.); (N.N.); (P.P.); (B.K.); (T.C.); (J.S.); (A.K.); (N.P.); (S.J.)
| | - Torntun Chinarak
- Faculty of Veterinary Technology, Kasetsart University, Bangkok 10900, Thailand; (T.P.); (N.N.); (P.P.); (B.K.); (T.C.); (J.S.); (A.K.); (N.P.); (S.J.)
| | - Jirasin Sridaphan
- Faculty of Veterinary Technology, Kasetsart University, Bangkok 10900, Thailand; (T.P.); (N.N.); (P.P.); (B.K.); (T.C.); (J.S.); (A.K.); (N.P.); (S.J.)
| | - Anamika Kritiyakan
- Faculty of Veterinary Technology, Kasetsart University, Bangkok 10900, Thailand; (T.P.); (N.N.); (P.P.); (B.K.); (T.C.); (J.S.); (A.K.); (N.P.); (S.J.)
| | - Noppadol Prasertsincharoen
- Faculty of Veterinary Technology, Kasetsart University, Bangkok 10900, Thailand; (T.P.); (N.N.); (P.P.); (B.K.); (T.C.); (J.S.); (A.K.); (N.P.); (S.J.)
| | - Sathaporn Jittapalapong
- Faculty of Veterinary Technology, Kasetsart University, Bangkok 10900, Thailand; (T.P.); (N.N.); (P.P.); (B.K.); (T.C.); (J.S.); (A.K.); (N.P.); (S.J.)
| | - Kanate Tangcham
- Office of Veterinary Public Health, Department of Health, Bangkok 10400, Thailand;
| | - Worawut Rerkamnuaychoke
- Faculty of Veterinary Medicine, Rajamangala University of Technology Tawan-ok, Chonburi 20110, Thailand;
| | - Yudai Kuroda
- Department of Veterinary Science, National Institute of Infectious Diseases (NIID), Tokyo 162-8640, Japan; (K.I.); (Y.K.); (M.T.); (K.T.); (E.P.); (M.V.-M.); (Y.I.); (M.H.); (T.Y.); (A.N.); (A.M.)
| | - Masakatsu Taira
- Department of Veterinary Science, National Institute of Infectious Diseases (NIID), Tokyo 162-8640, Japan; (K.I.); (Y.K.); (M.T.); (K.T.); (E.P.); (M.V.-M.); (Y.I.); (M.H.); (T.Y.); (A.N.); (A.M.)
| | - Kango Tatemoto
- Department of Veterinary Science, National Institute of Infectious Diseases (NIID), Tokyo 162-8640, Japan; (K.I.); (Y.K.); (M.T.); (K.T.); (E.P.); (M.V.-M.); (Y.I.); (M.H.); (T.Y.); (A.N.); (A.M.)
| | - Eunsil Park
- Department of Veterinary Science, National Institute of Infectious Diseases (NIID), Tokyo 162-8640, Japan; (K.I.); (Y.K.); (M.T.); (K.T.); (E.P.); (M.V.-M.); (Y.I.); (M.H.); (T.Y.); (A.N.); (A.M.)
| | - Milagros Virhuez-Mendoza
- Department of Veterinary Science, National Institute of Infectious Diseases (NIID), Tokyo 162-8640, Japan; (K.I.); (Y.K.); (M.T.); (K.T.); (E.P.); (M.V.-M.); (Y.I.); (M.H.); (T.Y.); (A.N.); (A.M.)
| | - Yusuke Inoue
- Department of Veterinary Science, National Institute of Infectious Diseases (NIID), Tokyo 162-8640, Japan; (K.I.); (Y.K.); (M.T.); (K.T.); (E.P.); (M.V.-M.); (Y.I.); (M.H.); (T.Y.); (A.N.); (A.M.)
- Joint Graduate School of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Michiko Harada
- Department of Veterinary Science, National Institute of Infectious Diseases (NIID), Tokyo 162-8640, Japan; (K.I.); (Y.K.); (M.T.); (K.T.); (E.P.); (M.V.-M.); (Y.I.); (M.H.); (T.Y.); (A.N.); (A.M.)
- Joint Graduate School of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Tsukasa Yamamoto
- Department of Veterinary Science, National Institute of Infectious Diseases (NIID), Tokyo 162-8640, Japan; (K.I.); (Y.K.); (M.T.); (K.T.); (E.P.); (M.V.-M.); (Y.I.); (M.H.); (T.Y.); (A.N.); (A.M.)
- Joint Graduate School of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Ayano Nishino
- Department of Veterinary Science, National Institute of Infectious Diseases (NIID), Tokyo 162-8640, Japan; (K.I.); (Y.K.); (M.T.); (K.T.); (E.P.); (M.V.-M.); (Y.I.); (M.H.); (T.Y.); (A.N.); (A.M.)
- Joint Graduate School of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Aya Matsuu
- Department of Veterinary Science, National Institute of Infectious Diseases (NIID), Tokyo 162-8640, Japan; (K.I.); (Y.K.); (M.T.); (K.T.); (E.P.); (M.V.-M.); (Y.I.); (M.H.); (T.Y.); (A.N.); (A.M.)
| | - Ken Maeda
- Department of Veterinary Science, National Institute of Infectious Diseases (NIID), Tokyo 162-8640, Japan; (K.I.); (Y.K.); (M.T.); (K.T.); (E.P.); (M.V.-M.); (Y.I.); (M.H.); (T.Y.); (A.N.); (A.M.)
- Joint Graduate School of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan
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Ishijima K, Yokono K, Park E, Taira M, Tatemoto K, Kuroda Y, Mendoza MV, Inoue Y, Harada M, Matsuu A, Morikawa S, Fukushi S, Maeda K. Simple and rapid detection of severe fever with thrombocytopenia syndrome virus in cats by reverse transcription-loop-mediated isothermal amplification (RT-LAMP) assay using a dried reagent. J Vet Med Sci 2023; 85:329-333. [PMID: 36653150 PMCID: PMC10076197 DOI: 10.1292/jvms.22-0523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Severe fever with thrombocytopenia syndrome virus (SFTSV) causes lethal hemorrhagic diseases in human, cats, and dogs. Several human cases involving direct transmission of SFTSV from diseased animals have been reported. Therefore, rapid diagnosis in veterinary clinics is important for preventing animal-to-human transmission. Previously, we developed a simplified reverse transcription-loop-mediated isothermal amplification (RT-LAMP) assay for human that does not require RNA extraction for detecting the SFTSV genome. In this study, we improved the simplified RT-LAMP assay for cats by introducing a dried reaction reagent and investigated the applicability of this method for diagnosing SFTS in cats. SFTSV RNA was detected in 11 of 12 cats naturally infected with SFTSV by RT-LAMP assay using both liquid and dried reagents. The RT-LAMP assay using liquid and dried reagents was also applicable to the detection of SFTSV genes 3-4 days after challenge in cats experimentally infected with SFTSV. The minimum copy number of SFTSV genes for 100% detection using the RT-LAMP assay with liquid and dried reagents was 4.3 × 104 and 9.6 × 104 copies/mL, respectively. Although the RT-LAMP assay using the dried reagent was less sensitive than that using the liquid reagent, it was sufficiently sensitive to detect SFTSV genes in cats with acute-phase SFTS. As the simplified RT-LAMP assay using a dried reagent enables detection of SFTSV genes more readily than the assay using a liquid reagent, it is applicable for use in veterinary clinics.
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Affiliation(s)
- Keita Ishijima
- Department of Veterinary Science, National Institute of Infectious Diseases, Tokyo, Japan
| | | | - Eunsil Park
- Department of Veterinary Science, National Institute of Infectious Diseases, Tokyo, Japan
| | - Masakatsu Taira
- Department of Veterinary Science, National Institute of Infectious Diseases, Tokyo, Japan
| | - Kango Tatemoto
- Department of Veterinary Science, National Institute of Infectious Diseases, Tokyo, Japan.,Joint Graduate School of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
| | - Yudai Kuroda
- Department of Veterinary Science, National Institute of Infectious Diseases, Tokyo, Japan
| | - Milagros Virhuez Mendoza
- Department of Veterinary Science, National Institute of Infectious Diseases, Tokyo, Japan.,Joint Graduate School of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
| | - Yusuke Inoue
- Department of Veterinary Science, National Institute of Infectious Diseases, Tokyo, Japan.,Joint Graduate School of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
| | - Michiko Harada
- Department of Veterinary Science, National Institute of Infectious Diseases, Tokyo, Japan.,Joint Graduate School of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
| | - Aya Matsuu
- Department of Veterinary Science, National Institute of Infectious Diseases, Tokyo, Japan
| | - Shigeru Morikawa
- Faculty of Veterinary Medicine, Okayama University of Science, Ehime, Japan
| | - Shuetsu Fukushi
- Department of Virology 1, National Institute of Infectious Diseases, Tokyo, Japan
| | - Ken Maeda
- Department of Veterinary Science, National Institute of Infectious Diseases, Tokyo, Japan.,Joint Graduate School of Veterinary Science, Yamaguchi University, Yamaguchi, Japan
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Matsuyama H, Taira M, Suzuki M. Regional Scale Distribution of Tick is Associated with Wildlife Distribution on the Boso Peninsula, Central Japan. Mammal Study 2022. [DOI: 10.3106/ms2022-0009] [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] [Indexed: 11/18/2022]
Affiliation(s)
- Hiroyuki Matsuyama
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba, Japan
| | | | - Maki Suzuki
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba, Japan
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5
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Ishijima K, Tatemoto K, Park E, Kimura M, Fujita O, Taira M, Kuroda Y, Mendoza MV, Inoue Y, Harada M, Matsuu A, Shimoda H, Kuwata R, Morikawa S, Maeda K. Lethal Disease in Dogs Naturally Infected with Severe Fever with Thrombocytopenia Syndrome Virus. Viruses 2022; 14:v14091963. [PMID: 36146769 PMCID: PMC9502089 DOI: 10.3390/v14091963] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 08/30/2022] [Accepted: 09/01/2022] [Indexed: 11/16/2022] Open
Abstract
Severe fever with the thrombocytopenia syndrome virus (SFTSV) causes fatal disease in humans, cats, and cheetahs. In this study, the information on seven dogs with SFTS was summarized. All dogs showed anorexia, high fever, leukopenia, and thrombocytopenia, two dogs showed vomiting and loose stool, and five dogs had tick parasites. All dogs also had a history of outdoor activity. The SFTSV gene was detected in all dogs. Remarkably, three dogs (43%) died. SFTSV was isolated from six dogs and the complete genomes were determined. A significant increase in anti-SFTSV-IgG antibodies was observed in two dogs after recovery, and anti-SFTSV-IgM antibodies were detected in four dogs in the acute phase. Using an ELISA cut-off value of 0.410 to discriminate between SFTSV-negative and positive dogs, the detection of anti-SFTSV-IgM antibodies was useful for the diagnosis of dogs with acute-phase SFTS. Four out of the ninety-eight SFTSV-negative dogs possessed high anti-SFTSV IgG antibody titers, indicating that some dogs can recover from SFTSV infection. In conclusion, SFTSV is lethal in some dogs, but many dogs recover from SFTSV infection.
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Affiliation(s)
- Keita Ishijima
- Department of Veterinary Science, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Kango Tatemoto
- Department of Veterinary Science, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Eunsil Park
- Department of Veterinary Science, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Masanobu Kimura
- Department of Veterinary Science, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Osamu Fujita
- Department of Veterinary Science, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Masakatsu Taira
- Department of Veterinary Science, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Yudai Kuroda
- Department of Veterinary Science, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Milagros Virhuez Mendoza
- Department of Veterinary Science, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Yusuke Inoue
- Department of Veterinary Science, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
- Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8515, Japan
| | - Michiko Harada
- Department of Veterinary Science, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
- Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8515, Japan
| | - Aya Matsuu
- Department of Veterinary Science, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Hiroshi Shimoda
- Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8515, Japan
| | - Ryusei Kuwata
- Faculty of Veterinary Medicine, Okayama University of Science, 1-3 Ikoinooka, Imabari 794-8555, Japan
| | - Shigeru Morikawa
- Faculty of Veterinary Medicine, Okayama University of Science, 1-3 Ikoinooka, Imabari 794-8555, Japan
| | - Ken Maeda
- Department of Veterinary Science, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
- Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8515, Japan
- Correspondence: ; Tel.: +81-3-4582-2750
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Tatemoto K, Mendoza MV, Ishijima K, Kuroda Y, Inoue Y, Taira M, Kuwata R, Takano A, Morikawa S, Shimoda H. Risk assessment of infection with severe fever with thrombocytopenia syndrome virus based on a 10-year serosurveillance in Yamaguchi Prefecture. J Vet Med Sci 2022; 84:1142-1145. [PMID: 35793949 PMCID: PMC9412060 DOI: 10.1292/jvms.22-0255] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
In Japan, the first patient with severe fever with thrombocytopenia syndrome was reported
in Yamaguchi in 2012. To understand the severe fever with thrombocytopenia syndrome virus
(SFTSV) infection in this region, a retrospective surveillance in sika deer and wild boars
in Yamaguchi was conducted using a virus-neutralizing (VN) test. The result revealed that
510 of the 789 sika deer and 199 of the 517 wild boars were positive for anti-SFTSV
antibodies. Interestingly, seroprevalence in sika deer increased significantly from
2010–2013 to 2015–2020. The SFTSV gene was detected in one of the 229 serum samples
collected from sika deer, but not from wild boars. In conclusion, SFTSV had spread among
wild animals before 2012 and expanded gradually around 2013–2015 in Yamaguchi.
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Affiliation(s)
- Kango Tatemoto
- Joint Graduate School of Veterinary Medicine, Yamaguchi University.,Department of Veterinary Science, National Institute of Infectious Diseases
| | - Milagros Virhuez Mendoza
- Joint Graduate School of Veterinary Medicine, Yamaguchi University.,Department of Veterinary Science, National Institute of Infectious Diseases
| | - Keita Ishijima
- Department of Veterinary Science, National Institute of Infectious Diseases
| | - Yudai Kuroda
- Department of Veterinary Science, National Institute of Infectious Diseases
| | - Yusuke Inoue
- Joint Graduate School of Veterinary Medicine, Yamaguchi University.,Department of Veterinary Science, National Institute of Infectious Diseases
| | - Masakatsu Taira
- Department of Veterinary Science, National Institute of Infectious Diseases
| | - Ryusei Kuwata
- Faculty of Veterinary Medicine, Okayama University of Science
| | - Ai Takano
- Joint Graduate School of Veterinary Medicine, Yamaguchi University
| | | | - Hiroshi Shimoda
- Joint Graduate School of Veterinary Medicine, Yamaguchi University
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Hasegawa M, Taira M, Kanaya T, Araki K, Watanabe T, Tominaga Y, Kugo Y, Ishida H, Narita A, Ueno T, Ueno T, Sawa Y. Clinical Outcomes for Children with Left Ventricular Noncompaction and Cardiomyopathy. J Heart Lung Transplant 2021. [DOI: 10.1016/j.healun.2021.01.810] [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: 11/26/2022] Open
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8
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Sekizuka T, Itokawa K, Hashino M, Kawano-Sugaya T, Tanaka R, Yatsu K, Ohnishi A, Goto K, Tsukagoshi H, Ehara H, Sadamasu K, Taira M, Shibata S, Nomoto R, Hiroi S, Toho M, Shimada T, Matsui T, Sunagawa T, Kamiya H, Yahata Y, Yamagishi T, Suzuki M, Wakita T, Kuroda M. A Genome Epidemiological Study of SARS-CoV-2 Introduction into Japan. mSphere 2020; 5:e00786-20. [PMID: 33177213 PMCID: PMC7657588 DOI: 10.1128/msphere.00786-20] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 10/28/2020] [Indexed: 01/07/2023] Open
Abstract
After the first case of coronavirus disease 2019 (COVID-19) in Japan on 15 January 2020, multiple nationwide COVID-19 clusters were identified by the end of February. The Japanese government focused on mitigating the emerging COVID-19 clusters by conducting active nationwide epidemiological surveillance. However, an increasing number of cases continued to appear until early April 2020, many with unclear infection routes and no recent history of travel outside Japan. We aimed to evaluate the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) genome sequences from the COVID-19 cases that appeared until early April 2020 and to characterize their genealogical networks in order to demonstrate possible routes of spread in Japan. Nasopharyngeal specimens were collected from patients, and reverse transcription-quantitative PCR tests for SARS-CoV-2 were performed. Positive RNA samples were subjected to whole-genome sequencing, and a haplotype network analysis was performed. Some of the primary clusters identified during January and February 2020 in Japan descended directly from the Wuhan-Hu-1-related isolates from China and other distinct clusters. Clusters were almost contained until mid-March; the haplotype network analysis demonstrated that the COVID-19 cases from late March through early April may have created an additional large cluster related to the outbreak in Europe, leading to additional spread within Japan. In conclusion, genome surveillance has suggested that there were at least two distinct SARS-CoV-2 introductions into Japan from China and other countries.IMPORTANCE This study aimed to evaluate the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) genome sequences from COVID-19 cases and to characterize their genealogical networks to demonstrate possible routes of spread in Japan. We found that there were at least two distinct SARS-CoV-2 introductions into Japan, initially from China and subsequently from other countries, including Europe. Our findings can help understand how SARS-CoV-2 entered Japan and contribute to increased knowledge of SARS-CoV-2 in Asia and its association with implemented stay-at-home/shelter-in-place/self-restraint/lockdown measures. This study suggested that it is necessary to formulate a more efficient containment strategy using real-time genome surveillance to support epidemiological field investigations in order to highlight potential infection linkages and mitigate the next wave of COVID-19 in Japan.
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Affiliation(s)
- Tsuyoshi Sekizuka
- Pathogen Genomics Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Kentaro Itokawa
- Pathogen Genomics Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Masanori Hashino
- Pathogen Genomics Center, National Institute of Infectious Diseases, Tokyo, Japan
| | | | - Rina Tanaka
- Pathogen Genomics Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Koji Yatsu
- Pathogen Genomics Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Asami Ohnishi
- Sapporo City Institute of Public Health, Sapporo, Japan
| | - Keiko Goto
- Ibaraki Prefectural Institute of Public Health, Ibaraki, Japan
| | - Hiroyuki Tsukagoshi
- Gunma Prefectural Institute of Public Health and Environmental Sciences, Gunma, Japan
| | - Hayato Ehara
- Saitama Prefectural Institute of Public Health, Saitama, Japan
| | - Kenji Sadamasu
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Masakatsu Taira
- Division of Virology and Medical Zoology, Chiba Prefectural Institute of Public Health, Chiba, Japan
| | - Shinichiro Shibata
- Microbiology Department, Nagoya City Public Health Research Institute, Aichi, Japan
| | - Ryohei Nomoto
- Department of Infectious Diseases, Kobe Institute of Health, Kobe, Hyogo, Japan
| | - Satoshi Hiroi
- Division of Microbiology, Osaka Institute of Public Health, Osaka, Japan
| | - Miho Toho
- Fukui Prefectural Institute of Public Health and Environmental Science, Fukui, Japan
| | - Tomoe Shimada
- Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Tamano Matsui
- Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Tomimasa Sunagawa
- Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Hajime Kamiya
- Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Yuichiro Yahata
- Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Takuya Yamagishi
- Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Motoi Suzuki
- Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Takaji Wakita
- National Institute of Infectious Diseases, Tokyo, Japan
| | - Makoto Kuroda
- Pathogen Genomics Center, National Institute of Infectious Diseases, Tokyo, Japan
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9
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Matsuyama H, Taira M, Suzuki M, Sando E. Associations between Japanese spotted fever (JSF) cases and wildlife distribution on the Boso Peninsula, Central Japan (2006-2017). J Vet Med Sci 2020; 82:1666-1670. [PMID: 33012734 PMCID: PMC7719884 DOI: 10.1292/jvms.20-0377] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Populations of large mammals have been dramatically increasing in Japan, resulting in damage to agriculture, forestry, and ecosystems. However, their effects
on tick-borne diseases have been poorly studied. Here, we focused on the relationship between Japanese spotted fever (JSF), a tick-borne disease caused by
Rickettsia japonica, and populations of large mammals. To explore factors that affected the area in which JSF cases occur, we used
generalized linear mixed models (GLMMs). We demonstrated that the expansion of the area of JSF occurrence can be predicted by deer density and geographical
factors, which is likely due to differences in landscape structure. However, the associated models have limitations because of the lack of information about the
distribution of vectors and reservoirs. To reduce the risk of humans contracting JSF, potential reservoirs should be confirmed.
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Affiliation(s)
- Hiroyuki Matsuyama
- Graduate School of Frontier Sciences, The University of Tokyo, 5F Environmental Building, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8563, Japan
| | - Masakatsu Taira
- Division of Virology and Medical Zoology, Chiba Prefectural Institute of Public Health, 666-2 Nitona-cho, Chuo-ku, Chiba 260-8715, Japan
| | - Maki Suzuki
- Graduate School of Frontier Sciences, The University of Tokyo, 5F Environmental Building, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8563, Japan
| | - Eiichiro Sando
- Institute of Tropical Medicine, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan
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10
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Urushiyama F, Matsubara K, Doi K, Taira M, Komiya T, Tokiwa T. First record of infestation of a pet sloth in Japan with the exotic tick Amblyomma geayi (Acari: Ixodidae). Parasitol Int 2020; 78:102157. [PMID: 32534954 DOI: 10.1016/j.parint.2020.102157] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 06/02/2020] [Accepted: 06/09/2020] [Indexed: 11/30/2022]
Abstract
On December 11, 2018, a single unengorged adult tick was found on the body surface of the trunk of an imported wild-caught Linnaeus's two-toed sloth (Choloepus didactylus) during a routine health check in an animal clinic in Tokyo, Japan. The tick was identified as Amblyomma geayi based on the morphological and molecular characteristics. This is the first case of the introduction of an Amblyomma species to Japan via an imported pet sloth. The present study highlights the current loopholes in Japan's regulatory system for animal imports.
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Affiliation(s)
- Fumiya Urushiyama
- Laboratory of Veterinary Parasitology, School of Veterinary Medicine, Nippon Veterinary and Life Science University, Kyonan, Musashino, Tokyo, Japan
| | | | - Kandai Doi
- Laboratory of Wildlife Medicine, School of Veterinary Medicine, Nippon Veterinary and Life Science University, Kyonan, Musashino, Tokyo, Japan
| | - Masakatsu Taira
- Division of Virology and Medical Zoology, Chiba Prefectural Institute of Public Health, Chuo, Chiba, Japan
| | - Tomoyoshi Komiya
- Department of Medical Technology and Clinical Engineering, Hokuriku University, Kanazawa, Ishikawa, Japan
| | - Toshihiro Tokiwa
- Laboratory of Veterinary Parasitology, School of Veterinary Medicine, Nippon Veterinary and Life Science University, Kyonan, Musashino, Tokyo, Japan.
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11
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Sekizuka T, Kuramoto S, Nariai E, Taira M, Hachisu Y, Tokaji A, Shinohara M, Kishimoto T, Itokawa K, Kobayashi Y, Kadokura K, Kamiya H, Matsui T, Suzuki M, Kuroda M. SARS-CoV-2 Genome Analysis of Japanese Travelers in Nile River Cruise. Front Microbiol 2020; 11:1316. [PMID: 32582136 PMCID: PMC7291780 DOI: 10.3389/fmicb.2020.01316] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 05/25/2020] [Indexed: 11/13/2022] Open
Abstract
Japan has reported 26 cases of coronavirus disease 2019 (COVID-19) linked to cruise tours on the River Nile in Egypt between March 5 and 15, 2020. Here, we characterized the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) genome of isolates from 10 travelers who returned from Egypt and from patients possibly associated with these travelers. We performed haplotype network analysis of SARS-CoV-2 isolates using genome-wide single-nucleotide variations. Our analysis identified two potential Egypt-related clusters from these imported cases, and these clusters were related to globally detected viruses in different countries.
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Affiliation(s)
- Tsuyoshi Sekizuka
- Pathogen Genomics Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Sanae Kuramoto
- Ishikawa Prefectural Institute of Public Health and Environmental Science, Kanazawa, Japan
| | - Eri Nariai
- Ishikawa Prefectural Institute of Public Health and Environmental Science, Kanazawa, Japan
| | | | - Yushi Hachisu
- Chiba Prefectural Institute of Public Health, Chiba, Japan
| | - Akihiko Tokaji
- Kochi Prefectural Institute of Public Health, Kochi, Japan
| | | | | | - Kentaro Itokawa
- Pathogen Genomics Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Yusuke Kobayashi
- Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Keisuke Kadokura
- Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Hajime Kamiya
- Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Tamano Matsui
- Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Motoi Suzuki
- Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Makoto Kuroda
- Pathogen Genomics Center, National Institute of Infectious Diseases, Tokyo, Japan
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12
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Abstract
We report a case of Rickettsia japonica infection in an 81-year-old man in central Japan. The patient had fever, rash, and an eschar but no evidence of a tick bite. His symptoms began 8 days after a land leech bite. The land leech is a potential vector of R. japonica.
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13
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Sando E, Suzuki M, Katoh S, Fujita H, Taira M, Yaegashi M, Ariyoshi K. Distinguishing Japanese Spotted Fever and Scrub Typhus, Central Japan, 2004- 2015. Emerg Infect Dis 2019; 24:1633-1641. [PMID: 30124190 PMCID: PMC6106405 DOI: 10.3201/eid2409.171436] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Japanese spotted fever (JSF) and scrub typhus (ST) are endemic to Japan and share similar clinical features. To document the clinical and epidemiologic characteristics that distinguish these 2 rickettsial diseases, during 2004-2015 we recruited 31 JSF patients, 188 ST patients, and 97 nonrickettsial disease patients from the southern Boso Peninsula of Japan. JSF occurred during April-October and ST during November-December. Patients with JSF and ST were significantly older and more likely to reside in wooded areas than were patients with nonrickettsial diseases. Spatial analyses revealed that JSF and ST clusters rarely overlapped. Clinical findings more frequently observed in JSF than in ST patients were purpura, palmar/plantar rash, hyponatremia, organ damage, and delayed defervescence after treatment. Although their clinical features are similar, JSF and ST differ in seasonality, geographic distribution, physical signs, and severity. Because a considerable percentage of patients did not notice rash and eschar, many rickettsial diseases might be underdiagnosed in Japan.
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14
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Sando E, Oshikawa Y, Tanaka A, Katoh S, Taira M, Ogawa T, Fujita H, Yaegashi M, Paris DH, Ariyoshi K. Case Report: Concurrent Sympatric Scrub Typhus and Japanese Spotted Fever in Japan. Am J Trop Med Hyg 2018; 99:1386-1389. [PMID: 30298801 PMCID: PMC6283490 DOI: 10.4269/ajtmh.18-0258] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 08/17/2018] [Indexed: 12/18/2022] Open
Abstract
Scrub typhus and Japanese spotted fever-both rickettsial diseases-are endemic and notifiable in Japan and may cause a fatal outcome without prompt treatment. Here we present the first case of a concurrent sympatric infection of both diseases with grade II evidence. A 67-year-old woman, after a single event of potential exposure to the pathogens, presented with a 12-day history of fever, pharyngeal pain, papulo-erythematous rash, and pronounced fatigue. Her erythematous rash was distributed on her trunk and extremities, palms, and soles and eventually progressed to purpura. Fever persisted until doxycycline was administered on day 12. A significant > 4-fold increase in immunoglobulin G and immunoglobulin M titers against multiple serotypes of Orientia tsutsugamushi and Rickettsia japonica were revealed by indirect immunoperoxidase assays. These clinical and serological data, even in the absence of molecular or isolation evidence, provided grade II evidence that this was a concurrent infection of sympatric scrub typhus and Japanese spotted fever.
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Affiliation(s)
- Eiichiro Sando
- Department of General Internal Medicine, Kameda Medical Center, Chiba, Japan
- Department of Clinical Tropical Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
- Department of Clinical Medicine, Institute of Tropical Medicine (NEKKEN), Nagasaki University, Nagasaki, Japan
| | - Yuka Oshikawa
- Department of Dermatology and Plastic Surgery, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
| | - Atsushi Tanaka
- Department of Dermatology, Kameda Medical Center, Chiba, Japan
| | - Shungo Katoh
- Department of Clinical Tropical Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
- Department of General Internal Medicine, Nagasaki Rosai Hospital, Sasebo, Nagasaki, Japan
| | | | - Tomoko Ogawa
- Chiba Prefectural Institute of Public Health, Chiba, Japan
| | - Hiromi Fujita
- Mahara Institute of Medical Acarology, Tokushima, Japan
| | - Makito Yaegashi
- Department of General Internal Medicine, Kameda Medical Center, Chiba, Japan
| | - Daniel H. Paris
- Department of Medicine, Swiss Tropical and Public Health Institute, Basel, Switzerland
- Faculty of Medicine, University of Basel, Basel, Switzerland
| | - Koya Ariyoshi
- Department of Clinical Tropical Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
- Department of Clinical Medicine, Institute of Tropical Medicine (NEKKEN), Nagasaki University, Nagasaki, Japan
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15
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Taira M, Ando S, Kawabata H, Fujita H, Kadosaka T, Sato H, Monma N, Ohashi N, Saijo M. Isolation and molecular detection of Ehrlichia species from ticks in western, central, and eastern Japan. Ticks Tick Borne Dis 2018; 10:344-351. [PMID: 30501980 DOI: 10.1016/j.ttbdis.2018.11.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [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: 09/27/2018] [Revised: 11/08/2018] [Accepted: 11/11/2018] [Indexed: 11/28/2022]
Abstract
Ehrlichiosis is a tick-borne bacterial disease caused by pathogens of the Ehrlichia genus. Although human ehrlichiosis has not been reported in Japan, Ehrlichia spp., which are closely related to Ehrlichia chaffeensis, were detected in several species of ixodid ticks. In this study, the presence of Ehrlichia spp. in ticks in Japan was studied by using isolation and molecular detection methods. In total, 1237 ticks were collected from vegetation in western, central, and eastern parts of Japan. The ticks were tested for detection of ehrlichial DNA with a nested polymerase chain reaction and/or isolation by inoculation of mice with the homogenate. Ehrlichial DNA was detected in 29 of these ticks. The ehrlichial DNAs, groEL and 16S rRNA genes, detected in Ixodes turdus showed a high similarity to those of E. chaffeensis with 94.7% and 99.2% identity, respectively. Ehrlichia sp. HF and Candidatus Neoehrlichia mikurensis were also detected in I. ovatus. Furthermore, Ehrlichia sp. HF was isolated from laboratory mice that were intraperitoneal inoculated with I. ovatus tick homogenate. Some ehrlichial agents detected in Ixodes ticks might be a previously unknown Ehrlichia species. In this study, Candidatus N. mikurensis was detected in I. ovatus ticks. Because I. ovatus is distributed widely and cases of its tick bite in humans are ubiquitously reported in Japan, there is a potential for ehrlichiosis to be endemic to Japan, necessitating intensive surveillance of this infectious disease.
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Affiliation(s)
- Masakatsu Taira
- United Graduate School of Agricultural Science and Veterinary Science, Gifu University, Gifu, Japan; Division of Virology and Medical Zoology, Chiba Prefectural Institute of Public Health, Chiba, Japan; Department of Virology 1, National Institute of Infectious Diseases, Tokyo, Japan.
| | - Shuji Ando
- Department of Virology 1, National Institute of Infectious Diseases, Tokyo, Japan
| | - Hiroki Kawabata
- United Graduate School of Agricultural Science and Veterinary Science, Gifu University, Gifu, Japan; Department of Bacteriology 1, National Institute of Infectious Diseases, Tokyo, Japan
| | - Hiromi Fujita
- Mahara Institute of Medical Acarology, Tokushima, Japan
| | | | - Hiroko Sato
- Akita Prefectural Research Center for Public Health and Environment, Akita, Japan
| | - Naoto Monma
- Fukushima Prefectural Institute for Public Health, Fukushima, Japan
| | - Norio Ohashi
- Department of Food and Nutritional Sciences, Graduate School of Integrated Pharmaceutical and Nutritional Sciences, University of Shizuoka, Shizuoka, Japan
| | - Masayuki Saijo
- United Graduate School of Agricultural Science and Veterinary Science, Gifu University, Gifu, Japan; Department of Virology 1, National Institute of Infectious Diseases, Tokyo, Japan
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16
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Narita J, Kogaki S, Ishigaki S, Torigoe F, Ishii R, Ishida H, Ozono K, Taira M, Ueno T, Sawa Y. Prolonged but Successful Weaning from Berlin Heart EXCOR After a Long-term Mechanical Unloading in Infantile DCM. J Heart Lung Transplant 2018. [DOI: 10.1016/j.healun.2018.01.1058] [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: 10/17/2022] Open
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17
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Taira M, Ueno T, Kido T, Kanaya T, Okuda N, Matsunaga Y, Toda K, Kuratani T, Sawa Y. Long Term Results of Mechanical Circulatory Support as Bridge to Transplant in Severe Heart Failure Pediatric Patients. J Heart Lung Transplant 2018. [DOI: 10.1016/j.healun.2018.01.1057] [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] Open
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18
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Sano K, Hamada H, Hirose S, Sugiura K, Harada S, Koizumi M, Hara M, Nishijima H, Taira M, Ogura A, Ogawa T, Takanashi JI. Prevalence and characteristics of human parechovirus and enterovirus infection in febrile infants. Pediatr Int 2018; 60:142-147. [PMID: 29205679 DOI: 10.1111/ped.13467] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Revised: 10/12/2017] [Accepted: 11/30/2017] [Indexed: 11/27/2022]
Abstract
BACKGROUND Human parechovirus (HPeV) and human non-polio enterovirus (EV) are important causes of fever without source (FWS) in young infants. Their prevalence and clinical characteristics are largely unknown in Asian countries. This study was conducted to elucidate the epidemiology and clinical characteristics of HPeV and EV infection in febrile young infants in Japan. METHODS During February 2010-August 2015, we obtained 53 stool, 44 throat swab, and 20 cerebrospinal fluid samples from 56 infants (<3 months) with FWS at a single hospital. To each sample, we applied reverse transcription-polymerase chain reaction for HPeV and EV. We compared the clinical characteristics of HPeV and EV patients. RESULTS HPeV was detected in 11 and EV in 17 patients. HPeV was detected during July-September. HPeV patients, compared with EV patients, had lower age (32 vs 47 days; P = n.s.), higher prevalence of exclusive breast-feeding (81.8 vs 29.4%; P = 0.024), and lower prevalence of sick contacts (36.4 vs 88.2%; P = 0.010). More HPeV than EV patients met the systemic inflammatory response syndrome criteria (90.9 vs 52.9%; P = 0.049). In the HPeV group, leukopenia, thrombopenia, and elevated deviation enzyme were observed, although the prevalence of abnormal cerebrospinal fluid was significantly lower than in the EV group. HPeV patients had longer hospital stay (7 vs 5 days; P = 0.025). CONCLUSION HPeV and EV are important causal viruses of FWS. Characteristic clinical pictures exist in these virus infections, but further research is needed to accumulate more cases to produce a comprehensive picture of these virus infections.
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Affiliation(s)
- Kentaro Sano
- Department of Pediatrics, Tokyo Women's Medical University Yachiyo Medical Center, Yachiyo, Chiba, Japan
| | - Hiromichi Hamada
- Department of Pediatrics, Tokyo Women's Medical University Yachiyo Medical Center, Yachiyo, Chiba, Japan
| | - Shoko Hirose
- Department of Pediatrics, Tokyo Women's Medical University Yachiyo Medical Center, Yachiyo, Chiba, Japan
| | - Kenta Sugiura
- Department of Pediatrics, Tokyo Women's Medical University Yachiyo Medical Center, Yachiyo, Chiba, Japan
| | - Satoko Harada
- Department of Pediatrics, Tokyo Women's Medical University Yachiyo Medical Center, Yachiyo, Chiba, Japan
| | - Mai Koizumi
- Department of Pediatrics, Tokyo Women's Medical University Yachiyo Medical Center, Yachiyo, Chiba, Japan
| | - Mayumi Hara
- Department of Pediatrics, Tokyo Women's Medical University Yachiyo Medical Center, Yachiyo, Chiba, Japan
| | - Haruna Nishijima
- Division of Virology, Chiba Prefectural Institute of Public Health, Chuou, Chiba, Japan
| | - Masakatsu Taira
- Division of Virology, Chiba Prefectural Institute of Public Health, Chuou, Chiba, Japan
| | - Atsushi Ogura
- Division of Virology, Chiba Prefectural Institute of Public Health, Chuou, Chiba, Japan
| | - Tomoko Ogawa
- Division of Virology, Chiba Prefectural Institute of Public Health, Chuou, Chiba, Japan
| | - Jun-Ichi Takanashi
- Department of Pediatrics, Tokyo Women's Medical University Yachiyo Medical Center, Yachiyo, Chiba, Japan.,Department of Neurology and Developmental Pediatrics, Tokyo Women's Medical University Yachiyo Medical Center, Yachiyo, Chiba, Japan
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19
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Akter A, Ooka T, Gotoh Y, Yamamoto S, Fujita H, Terasoma F, Kida K, Taira M, Nakadouzono F, Gokuden M, Hirano M, Miyashiro M, Inari K, Shimazu Y, Tabara K, Toyoda A, Yoshimura D, Itoh T, Kitano T, Sato MP, Katsura K, Mondal SI, Ogura Y, Ando S, Hayashi T. Extremely Low Genomic Diversity of Rickettsia japonica Distributed in Japan. Genome Biol Evol 2017; 9:124-133. [PMID: 28057731 PMCID: PMC5381555 DOI: 10.1093/gbe/evw304] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/27/2016] [Indexed: 12/25/2022] Open
Abstract
Rickettsiae are obligate intracellular bacteria that have small genomes as a result of reductive evolution. Many Rickettsia species of the spotted fever group (SFG) cause tick-borne diseases known as “spotted fevers”. The life cycle of SFG rickettsiae is closely associated with that of the tick, which is generally thought to act as a bacterial vector and reservoir that maintains the bacterium through transstadial and transovarial transmission. Each SFG member is thought to have adapted to a specific tick species, thus restricting the bacterial distribution to a relatively limited geographic region. These unique features of SFG rickettsiae allow investigation of how the genomes of such biologically and ecologically specialized bacteria evolve after genome reduction and the types of population structures that are generated. Here, we performed a nationwide, high-resolution phylogenetic analysis of Rickettsia japonica, an etiological agent of Japanese spotted fever that is distributed in Japan and Korea. The comparison of complete or nearly complete sequences obtained from 31 R. japonica strains isolated from various sources in Japan over the past 30 years demonstrated an extremely low level of genomic diversity. In particular, only 34 single nucleotide polymorphisms were identified among the 27 strains of the major lineage containing all clinical isolates and tick isolates from the three tick species. Our data provide novel insights into the biology and genome evolution of R. japonica, including the possibilities of recent clonal expansion and a long generation time in nature due to the long dormant phase associated with tick life cycles.
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Affiliation(s)
- Arzuba Akter
- Division of Microbiology, Department of Infectious Diseases, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Tadasuke Ooka
- Department of Microbiology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Yasuhiro Gotoh
- Department of Bacteriology, Faculty of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Seigo Yamamoto
- Frontier Science Research Center, University of Miyazaki, Miyazaki, Japan
| | - Hiromi Fujita
- Mahara Institute of Medical Acarology, Tokushima, Japan
| | - Fumio Terasoma
- Wakayama Prefectural Research Center of Environment and Public Health, Wakayama, Japan
| | - Kouji Kida
- Okayama Prefectural Institute for Environmental Science and Public Health, Okayama, Japan
| | | | - Fumiko Nakadouzono
- Kagoshima Prefectural Institute for Environmental Research and Public Health, Kagoshima, Japan
| | - Mutsuyo Gokuden
- Kagoshima Prefectural Institute for Environmental Research and Public Health, Kagoshima, Japan
| | - Manabu Hirano
- Seihi Public Health Center of Nagasaki Prefecture, Nagasaki, Japan
| | - Mamoru Miyashiro
- Fukuoka City Institute for Health and Environment, Fukuoka, Japan
| | - Kouichi Inari
- Mahara Institute of Medical Acarology, Tokushima, Japan
| | - Yukie Shimazu
- Hiroshima Prefectural Technology Research Institute, Public Health and Environment Center, Hiroshima, Japan
| | - Kenji Tabara
- Department of Health and Welfare, Shimane Prefectural Government, Shimane, Japan
| | - Atsushi Toyoda
- Comparative Genomics Laboratory, National Institute of Genetics, Shizuoka, Japan
| | - Dai Yoshimura
- School of Life Science and Technology, Tokyo Institute of Technology, Tokyo, Japan
| | - Takehiko Itoh
- School of Life Science and Technology, Tokyo Institute of Technology, Tokyo, Japan
| | - Tomokazu Kitano
- Division of Microbiology, Department of Infectious Diseases, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Mitsuhiko P Sato
- Department of Bacteriology, Faculty of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Keisuke Katsura
- Frontier Science Research Center, University of Miyazaki, Miyazaki, Japan
| | - Shakhinur Islam Mondal
- Division of Microbiology, Department of Infectious Diseases, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Yoshitoshi Ogura
- Department of Bacteriology, Faculty of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Shuji Ando
- Department of Virology-1, National Institute of Infectious Diseases, Tokyo, Japan
| | - Tetsuya Hayashi
- Department of Bacteriology, Faculty of Medical Sciences, Kyushu University, Fukuoka, Japan
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20
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Inamochi Y, Fueki K, Usui N, Taira M, Wakabayashi N. Adaptive change in chewing-related brain activity while wearing a palatal plate: an functional magnetic resonance imaging study. J Oral Rehabil 2017. [DOI: 10.1111/joor.12541] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Y. Inamochi
- Removable Partial Prosthodontics; Department of Masticatory Function Rehabilitation; Graduate School of Medical and Dental Sciences; Tokyo Medical and Dental University; Tokyo Japan
| | - K. Fueki
- Removable Partial Prosthodontics; Department of Masticatory Function Rehabilitation; Graduate School of Medical and Dental Sciences; Tokyo Medical and Dental University; Tokyo Japan
| | - N. Usui
- Department of Cognitive Neurobiology; The Center for Brain Integration Research; Graduate School of Medical and Dental Sciences; Tokyo Medical and Dental University; Tokyo Japan
| | - M. Taira
- Department of Cognitive Neurobiology; The Center for Brain Integration Research; Graduate School of Medical and Dental Sciences; Tokyo Medical and Dental University; Tokyo Japan
| | - N. Wakabayashi
- Removable Partial Prosthodontics; Department of Masticatory Function Rehabilitation; Graduate School of Medical and Dental Sciences; Tokyo Medical and Dental University; Tokyo Japan
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21
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Taira M, Ogawa T, Nishijima H, Yamamoto K, Hotta C, Akita M, Tajima S, Saijo M. The First Case of Zika Virus Isolated from a Japanese Patient Who Returned to Japan from Fiji in 2016. Jpn J Infect Dis 2017; 70:586-589. [PMID: 28367888 DOI: 10.7883/yoken.jjid.2017.042] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Outbreaks of Zika virus (ZIKV) infection in tropical and subtropical regions are a cause of worldwide concern and represent a public health emergency. ZIKV was isolated from a 17-year-old patient with fever and maculopapular rash. The patient returned to Japan from the Republic of Fiji in late April 2016. The complete genome sequence of the ZIKV isolate (ZIKV/Hu/S36/Chiba/2016), which might be the first strain to be isolated in Japan, was identified and reported.
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Affiliation(s)
- Masakatsu Taira
- Division of Virology, Chiba Prefectural Institute of Public Health
| | - Tomoko Ogawa
- Division of Virology, Chiba Prefectural Institute of Public Health
| | - Haruna Nishijima
- Division of Virology, Chiba Prefectural Institute of Public Health
| | | | - Chiemi Hotta
- Division of Virology, Chiba Prefectural Institute of Public Health
| | - Mamiko Akita
- Division of Virology, Chiba Prefectural Institute of Public Health
| | - Shigeru Tajima
- Department of Virology 1, National Institute of Infectious Diseases
| | - Masayuki Saijo
- Department of Virology 1, National Institute of Infectious Diseases
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22
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Shinagawa H, Ono T, Honda E, Sasaki T, Taira M, Iriki A, Kuroda T, Ohyama K. Chewing-side Preference is Involved in Differential Cortical Activation Patterns during Tongue Movements after Bilateral Gum-chewing: a Functional Magnetic Resonance Imaging Study. J Dent Res 2016; 83:762-6. [PMID: 15381715 DOI: 10.1177/154405910408301005] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [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] Open
Abstract
Contralateral dominance in the activation of the primary sensorimotor cortex (S1/M1) during tongue movements (TMs) has been shown to be associated with a chewing-side preference (CSP). However, little is known about its interaction with chewing-related cortical activation. Functional magnetic resonance imaging was performed before and after gum-chewing in six subjects who exhibited a left CSP to determine the relationship between the CSP and activation patterns in the S1/M1 during TMs. Before the subjects chewed the gum, activation foci were found in the bilateral S1/M1. In the left hemisphere, both signal intensity and the area of activation significantly increased during TMs within 10 min after subjects chewed gum. Moreover, this augmented activation significantly decreased within 20 min during tongue protrusion and leftward movement. In the right hemisphere, there were no marked changes during TMs. These results suggest that bilateral gum-chewing enhances activation of the S1/M1 ipsilateral to the CSP during TMs.
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Affiliation(s)
- H Shinagawa
- Department of Oral/Maxillofacial Radiology, The University of Tokushima, Tokushima 770-8503, Japan.
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Shinozaki T, Imamura Y, Kohashi R, Dezawa K, Nakaya Y, Sato Y, Watanabe K, Morimoto Y, Shizukuishi T, Abe O, Haji T, Tabei K, Taira M. Spatial and Temporal Brain Responses to Noxious Heat Thermal Stimuli in Burning Mouth Syndrome. J Dent Res 2016; 95:1138-46. [DOI: 10.1177/0022034516653580] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Burning mouth syndrome (BMS) is an idiopathic orofacial pain condition. Although the pathophysiology of BMS is not clearly understood, central and peripheral neuropathic mechanisms are thought to be involved. The authors compared brain response to noxious heat stimuli in 16 right-handed women with primary BMS and 15 sex- and age-matched right-handed healthy female controls. A thermal stimulus sequence of 32 °C to 40 °C to 32 °C to 49 °C was repeated 4 times in a cycle. Warm and noxious heat stimuli were delivered with a Peltier thermode placed on the right palm or right lower lip for 32 s each in a session. Functional magnetic resonance imaging data were obtained by recording echoplanar images with a block design. Statistical Parametric Mapping 8 software was used to analyze the data. Patients and controls both reported feeling more pain during palm stimulation than during lip stimulation. Repetition of noxious heat stimulus on the lower lip but not on the palm induced habituation in brain activity in the cingulate cortex without reduction in pain perception. Multiple regression analysis revealed a correlation between perceived pain intensity and suppression of brain activity in the anterior cingulate cortex when the repeated thermal sequence was applied at the lower lip. Furthermore, the response of the parahippocampal area differed in BMS patients and controls when the same repeated thermal sequence was applied at the palm. The authors’ findings indicate that BMS patients show specific brain responses due to impaired function of the central and peripheral nervous systems (clinical trial registration: UMIN000015002).
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Affiliation(s)
- T. Shinozaki
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
- Clinical Research Division, Nihon University Dental Research Center, Tokyo, Japan
| | - Y. Imamura
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
- Clinical Research Division, Nihon University Dental Research Center, Tokyo, Japan
| | - R. Kohashi
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - K. Dezawa
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - Y. Nakaya
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - Y. Sato
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - K. Watanabe
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - Y. Morimoto
- Division of Oral and Maxillofacial Radiology, Kyushu Dental University, Kitakyushu, Japan
| | - T. Shizukuishi
- Department of Radiology, Nihon University School of Medicine, Tokyo, Japan
| | - O. Abe
- Department of Radiology, Nihon University School of Medicine, Tokyo, Japan
| | - T. Haji
- Brain Activity Imaging Center, ATR-Promotions Inc., Osaka, Japan
| | - K. Tabei
- Department of Dementia Prevention and Therapeutics, Mie University Graduate School of Medicine, Tsu, Japan
| | - M. Taira
- Department of Cognitive Neurobiology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
- Center for Brain Integration Research, Tokyo Medical and Dental University, Tokyo, Japan
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Shoi K, Fueki K, Usui N, Taira M, Wakabayashi N. Influence of posterior dental arch length on brain activity during chewing in patients with mandibular distal extension removable partial dentures. J Oral Rehabil 2014; 41:486-95. [DOI: 10.1111/joor.12169] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/13/2014] [Indexed: 11/28/2022]
Affiliation(s)
- K. Shoi
- Section of Removable Partial Prosthodontics; Department of Masticatory Function Rehabilitation; Graduate School of Medical and Dental Sciences; Tokyo Medical and Dental University; Tokyo Japan
| | - K. Fueki
- Section of Removable Partial Prosthodontics; Department of Masticatory Function Rehabilitation; Graduate School of Medical and Dental Sciences; Tokyo Medical and Dental University; Tokyo Japan
| | - N. Usui
- Department of Cognitive Neurobiology; The Center for Brain Integration Research; Graduate School of Medical and Dental Sciences; Tokyo Medical and Dental University; Tokyo Japan
| | - M. Taira
- Department of Cognitive Neurobiology; The Center for Brain Integration Research; Graduate School of Medical and Dental Sciences; Tokyo Medical and Dental University; Tokyo Japan
| | - N. Wakabayashi
- Section of Removable Partial Prosthodontics; Department of Masticatory Function Rehabilitation; Graduate School of Medical and Dental Sciences; Tokyo Medical and Dental University; Tokyo Japan
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Kaneta A, Araki T, Taira M, Aomori T, Nagano D, Arai M, Nakamura T, Kurabayashi M, Yamamoto K. CPC-009 Administration of Dabigatran Removed from the Capsule. Eur J Hosp Pharm 2013. [DOI: 10.1136/ejhpharm-2013-000276.466] [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: 11/04/2022] Open
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26
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Yamashita K, Yoshioka Y, Pan H, Taira M, Ogura T, Nagano T, Aoyama M, Nagano K, Abe Y, Kamada H, Tsunoda SI, Aoshima H, Nabeshi H, Yoshikawa T, Tsutsumi Y. Biochemical and hematologic effects of polyvinylpyrrolidone-wrapped fullerene C60 after oral administration. Pharmazie 2013; 68:54-57. [PMID: 23444781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The fullerene C60 is used in consumer products such as cosmetics owing to its antioxidative effects and is being developed for nanomedical applications. However, knowledge regarding the safety of fullerene C60, especially after oral administration, is sparse. Here, we examined the safety of fullerene C60 in mice after 7 d of exposure to orally administered polyvinylpyrrolidone (PVP)-wrapped fullerene C60 (PVP-fullerene C60). Mice treated with PVP-fullerene C60 showed few changes in the plasma levels of various markers of kidney and liver injury and experienced no significant hematologic effects. Furthermore, the histology of the colon of PVP-fullerene C60-treated mice was indistinguishable from that of control mice. These results suggest that PVP-fullerene C60 lacks toxicity after high-dose oral administration and indicate that PVP-fullerene C60 can be considered safe for oral medication. These data provide basic information that likely will facilitate the production of safe and effective forms of fullerene C60.
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Affiliation(s)
- K Yamashita
- Laboratory of Toxicology and Safety Science, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan
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27
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Kyan H, Taira M, Yamamoto A, Inaba C, Zakimi S. Isolation and Characterization of <i>Toxoplasma gondii</i> Genotypes from Goats at an Abattoir in Okinawa. Jpn J Infect Dis 2012. [DOI: 10.7883/yoken.65.167] [Citation(s) in RCA: 12] [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: 11/17/2022]
Affiliation(s)
- Hisako Kyan
- Department of Biological Sciences Okinawa Prefectural Institute of Health and Environment, Japan
| | - Masakatsu Taira
- Department of Biological Sciences Okinawa Prefectural Institute of Health and Environment, Japan
| | - Asaka Yamamoto
- Department of Biological Sciences Okinawa Prefectural Institute of Health and Environment, Japan
| | - Chie Inaba
- Department of Biological Sciences Okinawa Prefectural Institute of Health and Environment, Japan
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Kyan H, Taira M, Yamamoto A, Inaba C, Zakimi S. Isolation and characterization of Toxoplasma gondii genotypes from goats at an abattoir in Okinawa. Jpn J Infect Dis 2012; 65:167-170. [PMID: 22446126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Toxoplasma gondii genotypes were isolated and characterized from cephalic muscle samples collected from 24 goats slaughtered at an abattoir in Okinawa between 2008 and 2009. Of the 24 samples assayed using latex agglutination, 18 were seropositive, 2 were pseudo-positive, and 4 were seronegative against T. gondii antibodies. The samples were then inoculated into laboratory mice to isolate the parasite. Among the isolated samples, 13 (72.2% of the 18 seropositive strains in the latex agglutination assay) were seropositive, 1 (50%) was pseudo-positive, and none were seronegative. However, after being frozen and stored at -20ºC, all samples were found to be T. gondii-free. Of the 14 isolates of the GRA6 genotype, 6 were of type I, 7 were of type II, and 1 was of type III; the genotype distribution ratio was similar to that of T. gondii strains isolated from locally raised pigs. Moreover, no sulfonamide-tolerant dhps gene mutant of T. gondii was detected.
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Affiliation(s)
- Hisako Kyan
- Department of Biological Sciences Okinawa Prefectural Institute of Health and Environment, Okinawa 901-1202, Japan. kyanhsko@pref.okinawa.lg.jp
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30
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Matsukawa Y, Nagashima M, Kamei S, Tanabe E, Takahashi S, Kojima T, Taira M, Morita K, Matsuura M, Sawada S. Random number generation evaluation in patients with systemic lupus erythematosus indicates a heterogeneous nature of central nervous system vulnerability. Scand J Rheumatol 2009; 35:295-9. [PMID: 16882594 DOI: 10.1080/03009740600556027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [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: 10/24/2022]
Abstract
OBJECTIVE To evaluate the vulnerability of the central nervous system (CNS) in patients with systemic lupus erythematosus (SLE). METHODS Forty-eight patients with SLE, 58 with schizophrenia in remission and 39 healthy controls were enrolled in the study. Patients vocally generated 100 numbers in a random fashion, using numbers 0 to 9, and were evaluated with seriality scores. Patients with SLE were subgrouped according to differences in the presence of Raynaud's phenomenon, anti-phospholipid antibody, lupus activity, and a history of neuropsychiatric (NP) lupus, and these patients were also evaluated by comparison with their counterparts. RESULTS In general, patients with SLE showed lower seriality scores than patients with schizophrenia, and higher seriality scores than normal controls. The scores of the patients with a history of NP lupus matched those with schizophrenia, and the scores of never having NP lupus matched those of the healthy controls. CONCLUSIONS CNS vulnerability may be prolonged in patients who have a history of NP lupus even when they appear to be in normal NP status. The damage in random number generation (RNG) observed in patients with a history of NP lupus seemed equal to that found in those with schizophrenia, whereas those patients never having NP lupus appeared to be equal to the controls. The current study suggests a heterogeneous nature of SLE and prolonged damage, especially in CNS vulnerability, when evaluating with RNG.
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Affiliation(s)
- Y Matsukawa
- Division of Haematology and Rheumatology, Department of Medicine, Nihon University of Medicine, Oyaguchi-Kamimachi, Itabashi, 173-8610, Tokyo, Japan.
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31
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Seki N, Yagi S, Suzuki Y, Shimada F, Taira M, Makino H, Amano K, Yagui K, Saito Y, Hashimoto N. Protein tyrosine phosphatase regulation in fibroblasts from patients with an insulin receptor gene mutation. Horm Metab Res 2008; 40:833-7. [PMID: 18925540 DOI: 10.1055/s-0028-1082082] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Tyrosine phosphorylation of the insulin receptor is the initial event following receptor binding to insulin, and it induces further tyrosine phosphorylation of various intracellular molecules. This signaling is countered by protein tyrosine phosphatases (PTPases), which reportedly are associated with insulin resistance that can be reduced by regulation of PTPases. Protein tyrosine phosphatase 1B (PTP1B) and leukocyte antigen-related PTPase (LAR) are the PTPases implicated most frequently in insulin resistance and diabetes mellitus. Here, we show that PTP1B and LAR are expressed in human fibroblasts, and we examine the regulation of PTPase activity in fibroblasts from patients with an insulin receptor gene mutation as an in vitro model of insulin resistance. Total PTPase activity was significantly lower in the cytosolic and membrane fractions of fibroblasts with mutations compared with controls (p<0.05). Insulin stimulation of fibroblasts with mutations resulted in a significantly smaller increase in PTP1B activity compared with stimulation of wild-type fibroblasts (p<0.05). This indicates that insulin receptor gene mutations blunt increases in PTPase activity in response to insulin, possibly via a negative feedback mechanism. Our data suggest that the PTPase activity in patients with insulin receptor gene mutation and severe insulin resistance may differ from that in ordinary type 2 diabetes.
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MESH Headings
- Blotting, Western
- Cells, Cultured
- Exons/genetics
- Fibroblasts/enzymology
- Gene Expression Regulation, Enzymologic/genetics
- Gene Expression Regulation, Enzymologic/physiology
- Humans
- Immunoprecipitation
- Insulin/pharmacology
- Insulin Resistance/genetics
- Mutation/physiology
- Protein Tyrosine Phosphatase, Non-Receptor Type 1/genetics
- Protein Tyrosine Phosphatase, Non-Receptor Type 1/metabolism
- Protein Tyrosine Phosphatases/biosynthesis
- Protein Tyrosine Phosphatases/genetics
- Receptor, Insulin/genetics
- Receptor-Like Protein Tyrosine Phosphatases, Class 4/genetics
- Receptor-Like Protein Tyrosine Phosphatases, Class 4/metabolism
- Reverse Transcriptase Polymerase Chain Reaction
- Stimulation, Chemical
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Affiliation(s)
- N Seki
- Clinical Research Center, National Hospital Organization, Chiba-East National Hospital, Chiba, Japan
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32
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Taira M, Toguchi MS, Hamada Y, Okazaki M, Takahashi J, Ito R, Toyosawa S, Ijyuin N. Studies on cytotoxicity of nickel ions using C3H10T1/2 fibroblast cells. J Oral Rehabil 2008. [DOI: 10.1111/j.1365-2842.2000.00608.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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33
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Del Pino EM, Venegas-Ferrín MF, Romero-Carvajal MA, Montenegro-Larrea PC, Sudou N, Taira M. Gastrulation in frogs with terrestrial reproduction. Dev Biol 2007. [DOI: 10.1016/j.ydbio.2007.03.045] [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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34
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Taira M, Hashimoto T, Takamatsu T, Maeda K. Subjective response to neuroleptics: the effect of a questionnaire about neuroleptic side effects. Prog Neuropsychopharmacol Biol Psychiatry 2006; 30:1139-42. [PMID: 16765499 DOI: 10.1016/j.pnpbp.2006.05.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2006] [Revised: 04/08/2006] [Accepted: 05/02/2006] [Indexed: 10/24/2022]
Abstract
BACKGROUND A patient's subjective response to neuroleptics is an important factor in pharmacotherapy of schizophrenia. In this study, we conducted an intervention to assess the effect of a questionnaire about neuroleptic side effects. We hypothesized that paying more attention to a patient's subjective distress associated with neuroleptic side effects would improve the patient's subjective response to neuroleptics. So we made a questionnaire about neuroleptic side effects, and used this questionnaire repeatedly in the usual clinical setting as an intervention. METHOD We administered this study to 210 outpatients who met the following criteria: (1) diagnosis of schizophrenia or schizoaffective disorder as defined by DSM-IV and (2) no worsening of symptoms in the past 6 months. The patients were divided into the intervention and the control groups. Patients of the intervention group filled out the questionnaire four times during 6 months and were given routine clinical care. Patients of the control group had routine clinical care only. The 10-item Drug Attitude Inventory (DAI-10) was used to evaluate the patients' subjective responses to neuroleptics. RESULTS After 6 months, the patients' subjective responses to neuroleptics assessed by the DAI-10 significantly improved in the intervention group (p<0.05 for within-group comparison). The most improved response was that the patients felt they were taking medications of their own free choice. CONCLUSION Paying more attention to the patient's subjective distress associated with neuroleptic side effects may have encouraged patients to participate in pharmacotherapy on their own initiative. This study suggests that our 19-item questionnaire is a useful tool to improve a patient's subjective response to neuroleptics.
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Affiliation(s)
- M Taira
- Department of Environmental Health and Safety, Division of Psychiatry and Neurology, Faculty of Medical Sciences, Graduate School of Medicine, Kobe University, Kobe 650-0017, Japan
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35
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Horie R, Watanabe M, Okamura T, Taira M, Shoda M, Motoji T, Utsunomiya A, Watanabe T, Higashihara M, Umezawa K. DHMEQ, a new NF-κB inhibitor, induces apoptosis and enhances fludarabine effects on chronic lymphocytic leukemia cells. Leukemia 2006; 20:800-6. [PMID: 16525497 DOI: 10.1038/sj.leu.2404167] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Chronic lymphocytic leukemia (CLL) is a low-grade lymphoid malignancy incurable with conventional modalities of chemotherapy. Strong and constitutive nuclear factor kappa B (NF-kappaB) activation is a characteristic of CLL cells. We examined the effects of a new NF-kappaB inhibitor, dehydroxymethylepoxyquinomicin (DHMEQ), on CLL cells. Dehydroxymethylepoxyquinomicin completely abrogated constitutive NF-kappaB activity and induced apoptosis of CLL cells. Apoptosis induced by DHMEQ was accompanied by downregulation of NF-kappaB-dependent antiapoptotic genes: c-IAP, Bfl-1, Bcl-X(L) and c-FLIP. Dehydroxymethylepoxyquinomicin also inhibited NF-kappaB induced by CD40 and enhanced fludarabine-mediated apoptosis of CLL cells. Results of this study suggest that inhibition of constitutive and inducible NF-kappaB by DHMEQ in combination with fludarabine is a promising strategy for the treatment of CLL.
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MESH Headings
- Aged
- Aged, 80 and over
- Antineoplastic Agents/pharmacology
- Antineoplastic Combined Chemotherapy Protocols/therapeutic use
- Apoptosis/drug effects
- Benzamides/pharmacology
- CASP8 and FADD-Like Apoptosis Regulating Protein
- CD40 Antigens/drug effects
- Caspases/drug effects
- Caspases/metabolism
- Cell Line, Tumor
- Cell Survival/drug effects
- Cyclohexanones/pharmacology
- Down-Regulation
- Drug Synergism
- Female
- Humans
- Inhibitor of Apoptosis Proteins/drug effects
- Inhibitor of Apoptosis Proteins/metabolism
- Intracellular Signaling Peptides and Proteins/drug effects
- Intracellular Signaling Peptides and Proteins/metabolism
- Leukemia, Lymphocytic, Chronic, B-Cell/diagnosis
- Leukemia, Lymphocytic, Chronic, B-Cell/drug therapy
- Leukemia, Lymphocytic, Chronic, B-Cell/metabolism
- Male
- Middle Aged
- Minor Histocompatibility Antigens
- NF-kappa B/antagonists & inhibitors
- NF-kappa B/metabolism
- Proto-Oncogene Proteins c-bcl-2/drug effects
- Proto-Oncogene Proteins c-bcl-2/metabolism
- Tumor Cells, Cultured
- Vidarabine/analogs & derivatives
- Vidarabine/pharmacology
- bcl-X Protein/drug effects
- bcl-X Protein/metabolism
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Affiliation(s)
- R Horie
- Department of Hematology, School of Medicine, Kitasato University, Sagamihara, Kanagawa, Japan.
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Nakamura M, Takahashi K, Taira K, Taira M, Ohno A, Sakugawa H, Arai M, Mishiro S. Hepatitis E virus infection in wild mongooses of Okinawa, Japan: Demonstration of anti-HEV antibodies and a full-genome nucleotide sequence. Hepatol Res 2006; 34:137-40. [PMID: 16413822 DOI: 10.1016/j.hepres.2005.10.010] [Citation(s) in RCA: 124] [Impact Index Per Article: 6.9] [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] [Received: 10/13/2005] [Accepted: 10/20/2005] [Indexed: 12/14/2022]
Abstract
Hepatitis E virus (HEV), a single-strand RNA virus, has been recovered not only from human beings but also from various species of animals. Here we report our results suggesting that mongoose should be added to the list of reservoir animals of HEV. Of 100 mongooses we examined in Okinawa, Japan, 21 were thought to be positive for anti-HEV antibodies, among which one was definitely positive for HEV RNA. Full-genome sequencing of the HEV isolate revealed that it segregates to a unique subgroup within genotype III. Interestingly, this mongoose strain was closely related to a swine isolate previously reported from Okinawa, implicating the possibility of interspecies transmission between these animals.
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Affiliation(s)
- Masaji Nakamura
- Meat Hygiene Inspection Center, Pharmaceutical Affairs and Sanitation Division, Department of Health and Welfare, Okinawa 901-1202, Japan
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Nakamura M, Taira K, Ohno A, Taira M, Sakugawa H, Takahashi K, Mishiro S. Hepatitis E virus isolates of genotype 4 recovered from wild boars in the Iriomote Island, Okinawa. ACTA ACUST UNITED AC 2006. [DOI: 10.2957/kanzo.47.161] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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38
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Taira M, Sasaki M, Kimura S, Araki Y. Microarray analysis of the cell cycle-related gene expression from a RAW264 murine macrophage cell line in response to lipopolysaccharide. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.ics.2005.06.020] [Citation(s) in RCA: 2] [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: 11/30/2022]
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39
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Taira M, Furuuchi H, Saitoh S, Sugiyama Y, Sekiyama S, Araki Y, Tabata Y. Bio-sorption of acidic gelatine hydro-gels implanted in the back tissues of Fisher's rats. J Oral Rehabil 2005; 32:382-7. [PMID: 15842249 DOI: 10.1111/j.1365-2842.2004.01417.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [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: 11/26/2022]
Abstract
Recent advance in tissue engineering therapy requires new scaffold materials. Acidic gelatine powders (10 wt%) were, thus, dissolved in water, were or were not cross-linked, and freeze-dried. After sterilization, prepared small sponges were implanted in 7-week-old Fisher's rats' subcutaneous tissues for up to 2 weeks. Sponges absorbed body fluid and changed into hydro-gels in vivo. Non-cross-linked hydro-gels were absorbed within 3 days, while cross-linked hydro-gels were eliminated after 7 days' implantation. Histological observations revealed that the common captivation process was mild while granulocytes and macrophages were encountered. Because acidic gelatine sponges can accommodate various basic growth factors, it can be speculated that prepared sponges might be used as short-time hydro-gel scaffolds and growth-factor carriers.
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Affiliation(s)
- M Taira
- Department of Dental Materials Science and Technology, Iwate Medical University School of Dentistry, Iwate, Japan.
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Abstract
Alkaline-heat-treated titanium self-forms an apatite surface layer in vivo. The aim of the present study was to materialistically characterize the surface of alkaline-heat-treated titanium immersed in simulated body fluid (AHS-TI) and to examine the differentiation behavior of osteoblasts on AHS-TI. SEM, thin-film XRD, FTIR, and XPS analyses revealed that AHS-TI contained a 1.0- micro m-thick, low-crystalline, and [002] direction-oriented carbonate apatite surface. Human osteoblast-like SaOS-2 cells were cultured on polystyrene, titanium, and AHS-TI, and RT-PCR analyses of osteogenic differentiation-related mRNAs were conducted. On AHS-TI, the expression of bone sialoprotein mRNA was up-regulated as compared with that on polystyrene and titanium (p < 0.05). On AHS-TI, the expression of osteopontin and osteocalcin mRNAs was up-regulated as compared with that on polystyrene (p<0.05). The results indicate that the apatite was bone-like and accelerated the osteogenic differentiation of SaOS-2, suggesting that alkaline-heat treatment might facilitate better integration of titanium implants with bone.
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Affiliation(s)
- N Chosa
- Department of Biochemistry, Iwate Medical University School of Dentistry, Morioka, Iwate, Japan.
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Takada M, Nambu A, Hatanaka N, Tachibana Y, Miyachi S, Taira M, Inase M. Organization of prefrontal outflow toward frontal motor-related areas in macaque monkeys. Eur J Neurosci 2004; 19:3328-42. [PMID: 15217388 DOI: 10.1111/j.0953-816x.2004.03425.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.2] [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: 11/29/2022]
Abstract
Linkage between the prefrontal cortex and the primary motor cortex is mediated by nonprimary motor-related areas of the frontal lobe. In an attempt to analyse the organization of the prefrontal outflow from area 46 toward the frontal motor-related areas, we investigated the pattern of projections involving the higher-order motor-related areas, such as the presupplementary motor area (pre-SMA) and the rostral cingulate motor area (CMAr). Tracer injections were made into these motor-related areas (their forelimb representation) on the medial wall that had been identified electrophysiologically. The following data were obtained from a series of tract-tracing experiments in Japanese monkeys. (i) Only a few neurons in area 46 were retrogradely labelled from the pre-SMA and CMAr; (ii) terminal labelling from area 46 occurred sparsely in the pre-SMA and CMAr; (iii) a dual labelling technique revealed that the sites of overlap of anterograde labelling from area 46 and retrograde labelling from the pre-SMA and CMAr were evident in the rostral parts of the dorsal and ventral premotor cortices (PMdr and PMvr); (iv) and tracer injections into the PMdr produced neuronal cell labelling in area 46 and terminal labelling in the pre-SMA and CMAr. The present results indicate that a large portion of the prefrontal signals from area 46 is not directly conveyed to the pre-SMA and CMAr, but rather indirectly by way of the PMdr and PMvr. This suggests that area 46 exerts its major influence on the cortical motor system via these premotor areas.
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Affiliation(s)
- M Takada
- Tokyo Metropolitan Institute for Neuroscience, Tokyo Metropolitan Organization for Medical Research, Fuchu, Tokyo 183-8526, Japan.
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Taira M, Toyosawa S, Ijyuin N, Takahashi J, Araki Y. Studies on osteogenic differentiation of rat bone marrow stromal cells cultured in type I collagen gel by RT-PCR analysis. J Oral Rehabil 2003; 30:802-7. [PMID: 12880403 DOI: 10.1046/j.1365-2842.2003.01170.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The purpose of this investigation was to examine by reverse-transcriptase polymerase chain reaction analysis the osteogenic differentiation of twice-passaged Sprague-Dawley rat bone marrow stromal cells in type I collagen gel cultured for 3 weeks. Two culture media were used here, namely Dulbecco's modified Eagle (DME) medium supplemented with vitamin C [Dex (-)] and those with vitamin C, dexamethasone and beta-glycerophosphate [Dex (+)]. Culture with Dex (-) medium in collagen gel for 3 weeks brought about the well-developed cell network and middle-stage osteogenic phenotype expression characterized by mRNA for alkaline phosphatase, osteonectin and osteopontin while those for bone sialo protein and osteocalcin were not detected. On the contrary, culture with Dex (+) medium in collagen gel for 3 weeks lead to necrosis of the cells. These results indicate that culture in collagen gel with Dex (-) DME medium containing vitamin C was useful for three-dimensional culture and middle-stage osteogenic differentiation of twice-passaged bone marrow stromal cells. This study might contribute to tissue engineering therapy to fix bone and periodontal defects in the future.
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Affiliation(s)
- M Taira
- Department of Dental Materials Science and Technology, Iwate Medical University School of Dentistry, Iwate, Japan.
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Taira M, Nakao H, Takahashi J, Araki Y. Effects of two vitamins, two growth factors and dexamethasone on the proliferation of rat bone marrow stromal cells and osteoblastic MC3T3-E1 cells. J Oral Rehabil 2003; 30:697-701. [PMID: 12791154 DOI: 10.1046/j.1365-2842.2003.01118.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [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: 11/20/2022]
Abstract
The purpose of this investigation was to examine the effects of the addition of five cytokines such as vitamin C, vitamin D, bone morphogenetic protein (BMP), transforming growth factor-beta (TGF-beta) and dexamethasone (Dex) to Dulbecco's modified Eagle (DME) medium on the proliferation of Sprague-Dawley (SD) rats' bone marrow stromal cells and osteoblastic MC3T3-E1 cells by conducting 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay. For bone marrow stromal cells, vitamin C was needed for doubling the cell viability. While BMP, TGF-beta and vitamin D maintained the growth rate given by vitamin C, Dex with beta-glycerophosphate (beta-GP) slightly reduced this cell proliferation rate. For MC3T3-E1 cells, the addition of four cytokines examined (vitamin C, vitamin D, TGF-beta and BMP) did not significantly increase the cell proliferation while Dex with vitamin C and beta-GP slightly enlarged the cell proliferation. It can be pointed out that vitamin C in DME medium is indispensable for rapid proliferation of bone marrow stromal cells that contain many osteo-progenitor cells but is not effective for quick increase of osteoblastic MC3T3-E1 cells. This finding appears to contribute to tissue engineering therapy to fix bone and periodontal defects in dentistry.
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Affiliation(s)
- M Taira
- Department of Dental Materials Science and Technology, Iwate Medical University School of Dentistry, Iwate, Japan.
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Shinagawa H, Ono T, Ishiwata Y, Honda E, Sasaki T, Taira M, Iriki A, Kuroda T. Hemispheric dominance of tongue control depends on the chewing-side preference. J Dent Res 2003; 82:278-83. [PMID: 12651931 DOI: 10.1177/154405910308200407] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [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] Open
Abstract
Blood-oxygenation-level-dependent (BOLD)-functional magnetic resonance imaging (fMRI) is known to be a non-invasive technique for studying human brain function. The purpose of this study was to apply BOLD-fMRI to identify brain areas responsible for producing tongue movements and their relation to chewing-side preference in 15 normal right-handed volunteers. A marked increase in BOLD signals was detected in primary sensorimotor cortices upon protrusion and in rightward and leftward tongue movements compared with at rest. In 10 subjects with an evident chewing-side preference, the BOLD signal change in the primary sensorimotor cortex was significantly greater on the side contralateral to the preferred chewing side. The results suggest that there is a relationship between hemispheric dominance and chewing-side preference in primary sensorimotor cortices responsible for tongue movements.
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Affiliation(s)
- H Shinagawa
- Maxillofacial Orthognathics, Graduate School, Tokyo Medical and Dental University, Japan.
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Abstract
Polylactide copolymer and collagen are now used as bio-absorbable scaffold materials for restoration of lost oral tissues. Polylactide caprolactone (PLCL) sponge and collagen gel were examined for their cellular reactions when implanted in 8-week-old Sprague-Dawley (SD) rats' subcutaneous tissues for up to 8 weeks. The PLCL sponges were slowly absorbed by a mild chronic inflammation process in which multinucleated giant cells covered and slowly captivated the sponge surfaces without thick encapsulation. On the other hand, collagen gel was surrounded by thick inflammatory reaction zones and infiltrated by acute inflammation cells including neutrophils, lymphocytes and macrophages, and disappeared more rapidly. Although the bio-absorption process differed, both materials, when combined, appear to be useful scaffold materials for tissue engineering therapy in future dental practice.
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Affiliation(s)
- M Taira
- Department of Dental Materials Science and Technology, Iwate Medical University School of Dentistry, Iwate, Japan.
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Abstract
Three commercial agar impression materials, two for clinical uses and one for dental laboratory, were examined for their thermal properties by differential thermogravimetric (DTG) thermal analyses and viscosity measurements. On DTG profiles, an endothermic peak along with weight loss at around 100 degrees C was observed on all three agar impression materials as a result of water evaporation. Two clinical agar impression materials were more susceptible to this trend than the remaining one dental laboratory agar impression material. The viscosity of three agar impression materials could be expressed in the exponential function of temperature. Viscosity at 46 degrees C of one dental laboratory agar impression material far exceeded those of two clinical agar impression materials. Monitoring the viscosity could facilitate the detailed analysis of setting process of agar impression materials upon cooling, and might be useful for future development of agar-based dental impression materials.
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Affiliation(s)
- M Taira
- Department of Dental Materials Science and Technology, Iwate Medical University School of Dentistry, Iwate, Japan.
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Abstract
Hydroxyapatite (HAp) was synthesized in the presence of a variety of amino acids in order to investigate the effect of amino acid on the crystallinity and the solubility characteristics of HAp in the HAp-synthesizing condition. In the results of X-ray diffraction analysis, HAp synthesized in the presence of glycine (HAp-Gly), serine (HAp-Ser), aspartic acid (HAp-Asp) and glutamic acid (HAp-Glu) showed poor crystallinity compared with HAp synthesized in the absence of amino acid (HAp-con). The results of Fourier transform infrared spectroscopy suggested the adsorption of these amino acids on HAp. Scanning electron microphotographs showed that the size and morphology of HAp adsorbed amino acids changed significantly. Furthermore, the solubility of these HAps increased significantly compared to HAp-con, each differing in four amino acids. However, other amino acids did not affect the crystallinity and morphology of HAp and had no significant change in their solubility. Collectively, this study suggests that the crystallinity and the solubility of synthesized HAp are different owing to the variation of amino acids in the HAp synthesizing condition. It is expected that digestion-regulated HAp materials could be synthesized by using amino acid in their synthesizing condition.
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Affiliation(s)
- T Matsumoto
- Department of Biomaterials Science, Graduate School of Dentistry, Osaka University, Yamadaoka, Suita, Japan.
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Shinga J, Itoh M, Shiokawa K, Taira S, Taira M. Early patterning of the prospective midbrain-hindbrain boundary by the HES-related gene XHR1 in Xenopus embryos. Mech Dev 2001; 109:225-39. [PMID: 11731236 DOI: 10.1016/s0925-4773(01)00528-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [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: 10/27/2022]
Abstract
The molecular mechanisms that govern early patterning of anterior neuroectoderm (ANE) for the prospective brain region in vertebrates are largely unknown. Screening a cDNA library of Xenopus ANE led to the isolation of a Hairy and Enhancer of split- (HES)-related transcriptional repressor gene, Xenopus HES-related 1 (XHR1). XHR1 is specifically expressed in the midbrain-hindbrain boundary (MHB) region at the tailbud stage. The localized expression of XHR1 was detected as early as the early gastrula stage in the presumptive MHB region, an area just anterior to the involuting dorsal mesoderm that is demarcated by the expression of the gene Xbra. Expression of XHR1 was detected much earlier than that of other known MHB genes, XPax-2 and En-2, and also before the formation of the expression boundary between Xotx2 and Xgbx-2, suggesting that the early patterning of the presumptive MHB is independent of Xotx2 and Xgbx-2. Instead, the location of XHR1 expression appears to be determined in relation to the Xbra expression domain, since reduced or ectopic expression of Xbra altered the XHR1 expression domain according to the location of Xbra expression. In functional assays using mRNA injection, overexpression of dominant-negative forms of XHR1 in the MHB region led to marked reduction of XPax-2 and En-2 expression, and this phenotype was rescued by coexpression of wild-type XHR1. Furthermore, ectopically expressed wild-type XHR1 near the MHB region enhanced En-2 expression only in the MHB region but not in the region outside the MHB. These data suggest that XHR1 is required, but not sufficient by itself, to initiate MHB marker gene expression. Based on these data, we propose that XHR1 demarcates the prospective MHB region in the neuroectoderm in Xenopus early gastrulae.
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Affiliation(s)
- J Shinga
- Department of Biological Sciences, Graduate School of Science, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-0033, Tokyo, Japan
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Tsutsui K, Jiang M, Yara K, Sakata H, Taira M. Integration of perspective and disparity cues in surface-orientation-selective neurons of area CIP. J Neurophysiol 2001; 86:2856-67. [PMID: 11731542 DOI: 10.1152/jn.2001.86.6.2856] [Citation(s) in RCA: 121] [Impact Index Per Article: 5.3] [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: 11/22/2022] Open
Abstract
We investigated the effects of linear perspective and binocular disparity, as monocular and binocular depth cues, respectively, on the response of surface-orientation-selective (SOS) neurons in the caudal part of the lateral bank of the intraparietal sulcus (area CIP). During the single-unit recording, monkeys were required to perform the delayed-matching-to-sample (successive same/different discrimination) of discriminating surface orientation in stereoscopic computer graphics. Of 211 visually responsive neurons, 66 were intensively tested using the solid-figure stereogram (SFS) of a square plate with both disparity and perspective cues (D+P condition), and 62 of these were identified as SOS neurons for responding selectively to the orientation of stimuli. All these neurons were further tested using a solid figure with perspective cues alone (P-only condition), and 58% (36/62) of these showed selective response to the orientation of the stimuli. Of the 62 SOS neurons, 35 neurons were also tested using SFS with disparity cues alone (D-only condition) in addition to the D+P and P-only conditions. We classified these 35 neurons into four groups by comparing the response selectivity under the P-only and D-only conditions. More than one-half of these (19/35) were sensitive to both perspective and disparity cues (DP neurons), and nearly one-third (11/35) of these were sensitive to disparity cues alone (D neurons), but a few (2/35) were sensitive to perspective cues alone (P neurons). The remaining (3/35) neurons exhibited orientation selectivity only when both cues were present. In DP neurons, the preferred orientation under the D+P condition was correlated to those under the D-only and P-only conditions, and the response magnitude under the D+P condition was greater than those under the D-only and P-only conditions, suggesting the integration of both cues for the perception of surface orientation. However, in these neurons, the orientation tuning sharpness under the D+P and D-only conditions was higher than that under the P-only condition, suggesting the dominance of disparity cues. After the single-unit recording experiments, muscimol was microinjected into the recording site to temporarily inactivate its function. In all three effective cases out of six microinjection experiments, discrimination of a three-dimensional (3D) surface orientation was impaired when disparity cues alone were present. In only one effective case, when a relatively large amount of muscimol was microinjected, discrimination of a 3D surface orientation was impaired even when both disparity and perspective cues were present. These results suggest that linear perspective is an important cue for representations of a 3D surface of SOS neurons in area CIP, although it is less effective than binocular disparity, and that both of these depth cues may be integrated in area CIP for the perception of surface orientation in depth.
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Affiliation(s)
- K Tsutsui
- Department of Physiology, Nihon University School of Medicine, Tokyo, Japan
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Abstract
We describe here a systematic screen of an anterior endomesoderm (AEM) cDNA library to isolate novel genes which are expressed in the head organizer region. After removing clones which hybridized to labeled cDNA probes synthesized with total RNA from a trunk region of tailbud embryos, the 5' ends of 1039 randomly picked cDNA clones were sequenced to make expressed sequence tags (ESTs), which formed 754 tentative unique clusters. Those clusters were compared against public databases and classified according to similarities found to other genes and gene products. Of them, 151 clusters were identified as known Xenopus genes, including eight organizer-specific ones (5.3%). Gene expression pattern screening was performed for 198 unique clones, which were selected because they either have no known function or are predicted to be developmental regulators in other species. The screen revealed nine possible organizer-specific clones (4.5%), four of which appeared to be expressed in the head organizer region. Detailed expression analysis from gastrula to neurula stages showed that these four genes named crescent, P7E4 (homologous to human hypothetical genes), P8F7 (an unclassified gene), and P17F11 (homologous to human and Arabidopsis hypothetical genes) demarcate spatiotemporally distinct subregions of the AEM corresponding to the head organizer region. These results indicate that our screening strategy is effective in isolating novel region-specific genes.
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Affiliation(s)
- M Shibata
- Department of Biological Sciences, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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