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Maeda K, Ishida Y, Nonogaki T, Shimizu A, Yamanaka Y, Matsuyama R, Kato R, Mori N. Burden of Premorbid Consumption of Texture Modified Diets in Daily Life on Nutritional Status and Outcomes of Hospitalization. J Nutr Health Aging 2019; 23:973-978. [PMID: 31781727 DOI: 10.1007/s12603-019-1237-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
OBJECTIVES Due to the water-rich cooking process required to soften texture modified diets (TMDs), TMDs may have poorer nutrition. The aim of this study was to investigate the associations between daily premorbid TMD consumption and nutritional status at the time of hospitalization, and its burden on hospitalization outcomes. DESIGN Retrospective observational study. SETTING An academic hospital. PARTICIPANTS The cohort comprised 3,594 older adult patients aged ≥65 years admitted to the hospital. MEASUREMENTS Patients were interviewed on admission using a premorbid daily consumption meal form to determine whether the patient ate a TMD. Nutritional status was examined using nutritional screening tools (Mini-Nutritional Assessment Short Form [MNA-SF], Malnutrition Universal Screening Tool [MUST], Geriatric Nutritional Risk Index [GNRI]) and the European Society of Clinical Nutrition and Metabolism (ESPEN)-defined criteria of malnutrition at admission. Length of hospital stay (LOS) and in-hospital mortality were considered outcomes of hospitalization. Multivariate analyses were performed to detect associations between premorbid TMD consumption and nutritional status and outcomes. RESULTS The mean age of the subjects was 75.9±7.0 years, including 58% males. Overall, 110 (3.1%) patients consuming a premorbid TMD were identified. They were older (p<0.001), had poor nutritional status (lower MNA-SF score [p<0.001] and GNRI value [p<0.001], higher MUST score [p<0.001], and more prevalent ESPEN-defined malnutrition [61.8% vs. 14.0%, p<0.001] than did patients without a TMD. The mortality rate and LOS of patients with TMD was higher (7.3% vs. 2.9%, p=0.017) and longer (19 days vs. 8 days, p<0.001) than those without TMD. Multivariate analyses showed that TMD consumption was independently associated with poor nutritional status and prolonged LOS after adjusting confounders. CONCLUSION Daily consumption of a TMD during the premorbid period affects nutritional status at the time of hospitalization and outcomes. Further studies are necessary to investigate whether nutritional intervention can improve outcomes for people on a TMD.
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Hiyoshi Y, Miyamoto Y, Kato R, Sawayama H, Eto K, Nagai Y, Iwagami S, Baba Y, Yoshida N, Baba H. Laparoscopic sigmoidectomy and double-stapling technique anastomosis via needlescopic surgery - a video vignette. Colorectal Dis 2019; 21:122-123. [PMID: 30387927 DOI: 10.1111/codi.14461] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Accepted: 10/14/2018] [Indexed: 02/08/2023]
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Miyake H, Sakagami J, Yasuda H, Sogame Y, Kato R, Suwa K, Dainaka K, Takata T, Yokota I, Itoh Y. Association of fatty pancreas with pancreatic endocrine and exocrine function. PLoS One 2018; 13:e0209448. [PMID: 30571730 PMCID: PMC6301765 DOI: 10.1371/journal.pone.0209448] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2018] [Accepted: 12/05/2018] [Indexed: 12/13/2022] Open
Abstract
Aim The purpose of this study was to clarify whether fatty pancreas might lead to impaired pancreatic endocrine or exocrine function. Material and methods The study involved 109 participants who had undergone the glucagon stimulation test and N-benzoyl-L-tyros-p-amino benzoic acid (BT-PABA) test to assess pancreatic function as well as unenhanced abdominal computed tomography (CT). Pancreatic endocrine impairment was defined as ΔC peptide immunoreactivity less than 2 [mmol/L] in the glucagon stimulation test, and pancreatic exocrine impairment was defined as a urinary PABA excretion rate less than 70% on the BT-PABA test. We defined as the mean CT value of pancreas / CT value of spleen (P/S ratio) as a marker to assess fatty pancreas. We analyzed the association between fatty pancreas and pancreatic impairment using the logistic regression model. The odds ratio (OR) is shown per 0.1 unit. Results Pancreatic endocrine function was impaired in 33.0% of the participants, and 56.9% of those were regarded as having pancreatic exocrine impairment. The P/S ratio was significantly correlated with pancreatic endocrine impairment in univariate analysis (OR = 0.61, 95% confidence interval (CI) = 0.43–0.83, P = 0.0013) and multivariate analysis (OR = 0.38, 95% CI = 0.22–0.61, P < .0001) for all participants. Similar significant relationships were observed in both univariate (OR = 0.70, 95% CI = 0.49–0.99, P = 0.04) and multivariate (OR = 0.39, 95% CI = 0.21–0.66, P = 0.0002) analyses for the participants without diabetes (n = 93). The amount of pancreatic fat was not associated with exocrine impairment in univariate analysis (OR = 0.80, 95% CI = 0.59–1.06, P = 0.12). Conclusion Fatty pancreas was associated with pancreatic endocrine impairment but did not have a clear relationship with pancreatic exocrine impairment.
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Sunami K, Nishikawa T, Miyagawa K, Horiuchi S, Kato R, Miyamoto T, Okamoto H, Kanoda K. Evidence for solitonic spin excitations from a charge-lattice-coupled ferroelectric order. SCIENCE ADVANCES 2018; 4:eaau7725. [PMID: 30515457 PMCID: PMC6269158 DOI: 10.1126/sciadv.aau7725] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 10/30/2018] [Indexed: 06/09/2023]
Abstract
Topological defects have been explored in different fields ranging from condensed matter physics and particle physics to cosmology. In condensed matter, strong coupling between charge, spin, and lattice degrees of freedom brings about emergent excitations with topological characteristics at low energies. One-dimensional (1D) systems with degenerate dimerization patterns are typical stages for the generation of topological defects, dubbed "solitons"; for instance, charged solitons are responsible for high electrical conductivity in doped trans-polyacetylene. Here, we provide evidence based on a nuclear magnetic resonance (NMR) study for mobile spin solitons deconfined from a strongly charge-lattice-coupled spin-singlet ferroelectric order in a quasi-1D organic charge-transfer complex. The NMR spectral shift and relaxation rate associated with static and dynamic spin susceptibilities indicate that the ferroelectric order is violated by dilute solitonic spin excitations, which were further demonstrated to move diffusively by the frequency dependence of the relaxation rate. The traveling solitons revealed here may promise the emergence of anomalous electrical and thermal transport.
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Miyajima-Tabata A, Komoriya K, Tanaka M, Hiruma H, Kato R, Haishima Y. Evaluation of biomarkers for haemocomopatibility of polymer biomaterials. Toxicol Lett 2018. [DOI: 10.1016/j.toxlet.2018.06.559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Pustogow A, Bories M, Löhle A, Rösslhuber R, Zhukova E, Gorshunov B, Tomić S, Schlueter JA, Hübner R, Hiramatsu T, Yoshida Y, Saito G, Kato R, Lee TH, Dobrosavljević V, Fratini S, Dressel M. Quantum spin liquids unveil the genuine Mott state. NATURE MATERIALS 2018; 17:773-777. [PMID: 30082905 DOI: 10.1038/s41563-018-0140-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 06/26/2018] [Indexed: 05/13/2023]
Abstract
The localization of charge carriers by electronic repulsion was suggested by Mott in the 1930s to explain the insulating state observed in supposedly metallic NiO. The Mott metal-insulator transition has been subject of intense investigations ever since1-3-not least for its relation to high-temperature superconductivity4. A detailed comparison to real materials, however, is lacking because the pristine Mott state is commonly obscured by antiferromagnetism and a complicated band structure. Here we study organic quantum spin liquids, prototype realizations of the single-band Hubbard model in the absence of magnetic order. Mapping the Hubbard bands by optical spectroscopy provides an absolute measure of the interaction strength and bandwidth-the crucial parameters that enter calculations. In this way, we advance beyond conventional temperature-pressure plots and quantitatively compose a generic phase diagram for all genuine Mott insulators based on the absolute strength of the electronic correlations. We also identify metallic quantum fluctuations as a precursor of the Mott insulator-metal transition, previously predicted but never observed. Our results suggest that all relevant phenomena in the phase diagram scale with the Coulomb repulsion U, which provides a direct link to unconventional superconductivity in cuprates and other strongly correlated materials.
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Pustogow A, Saito Y, Zhukova E, Gorshunov B, Kato R, Lee TH, Fratini S, Dobrosavljević V, Dressel M. Low-Energy Excitations in Quantum Spin Liquids Identified by Optical Spectroscopy. PHYSICAL REVIEW LETTERS 2018; 121:056402. [PMID: 30118313 DOI: 10.1103/physrevlett.121.056402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Indexed: 06/08/2023]
Abstract
The electrodynamic response of organic spin liquids with highly frustrated triangular lattices has been measured in a wide energy range. While the overall optical spectra of these Mott insulators are governed by transitions between the Hubbard bands, distinct in-gap excitations can be identified at low temperatures and frequencies, which we attribute to the quantum-spin-liquid state. For the strongly correlated β^{'}-EtMe_{3}Sb[Pd(dmit)_{2}]_{2}, we discover enhanced conductivity below 175 cm^{-1}, comparable to the energy of the magnetic coupling J≈250 K. For ω→0, these low-frequency excitations vanish faster than the charge-carrier response subject to Mott-Hubbard correlations, resulting in a dome-shaped band peaked at 100 cm^{-1}. Possible relations to spinons, magnons, and disorder are discussed.
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Hayashi T, Matsumoto S, Hosokawa A, Yamamoto K, Nomura A, Woo E, Imano H, Kato R, Ijiri Y, Yamaguchi T, Izumi Y, Yoshiyama M, Okada Y, Asahi M. P2501Rivaroxaban combined with spironolactone attenuates cardiovascular remodeling due to hypoxia in pulmonary arterial hypertension. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p2501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Murakami T, Ikari Y, Taniai S, Ishibashi Y, Taguchi I, Ako J, Kyono H, Yoshizawa M, Itoh T, Morino Y, Kato R, Sakuma M, Sugimura H, Akashi Y, Yoshino H. P4393The clinical characteristics of mortality in patients with Takotsubo Syndrome during hospitalization-A Multicenter Registry in Eight-University Hospitals in East Japan. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.p4393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Hong H, Kretzmer R, Kato R, Ward SD. 1156 A Pediatric Case of UNC80 Mutation and Abnormal Respiratory Control Treated with Positive Airway Pressure Therapy. Sleep 2018. [DOI: 10.1093/sleep/zsy063.1155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Nishida T, Hayashi T, Inamoto T, Kato R, Ibuki N, Takahara K, Takai T, Yoshikawa Y, Uchimoto T, Saito K, Tanda N, Kouno J, Minami K, Uehara H, Hirano H, Nomi H, Okada Y, Azuma H. Dual Gas Treatment With Hydrogen and Carbon Monoxide Attenuates Oxidative Stress and Protects From Renal Ischemia-Reperfusion Injury. Transplant Proc 2018; 50:250-258. [DOI: 10.1016/j.transproceed.2017.12.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2017] [Revised: 10/26/2017] [Accepted: 12/05/2017] [Indexed: 01/14/2023]
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Yonesaka K, Kudoh K, Takamura S, Sakai H, Kato R, Haratani K, Takahama T, Tanaka K, Hayashi H, Kaneda H, Takeda M, Maenishi O, Yamato M, Miyazawa M, Nishio K, Nakagawa K. P2.07-021 A Checkpoint Molecule B7-H3 as a Novel Immune Therapy Target for Non-Small Cell Lung Cancer (NSCLC). J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.11.080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Yamakawa H, Miyamoto T, Morimoto T, Terashige T, Yada H, Kida N, Suda M, Yamamoto HM, Kato R, Miyagawa K, Kanoda K, Okamoto H. Mott transition by an impulsive dielectric breakdown. NATURE MATERIALS 2017; 16:1100-1105. [PMID: 28825731 DOI: 10.1038/nmat4967] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Accepted: 07/11/2017] [Indexed: 06/07/2023]
Abstract
The transition of a Mott insulator to metal, the Mott transition, can occur via carrier doping by elemental substitution, and by photoirradiation, as observed in transition-metal compounds and in organic materials. Here, we show that the application of a strong electric field can induce a Mott transition by a new pathway, namely through impulsive dielectric breakdown. Irradiation of a terahertz electric-field pulse on an ET-based compound, κ-(ET) 2Cu[N(CN) 2]Br (ET:bis(ethylenedithio)tetrathiafulvalene), collapses the original Mott gap of ∼30 meV with a ∼0.1 ps time constant after doublon-holon pair productions by quantum tunnelling processes, as indicated by the nonlinear increase of Drude-like low-energy spectral weights. Additionally, we demonstrate metallization using this method is faster than that by a femtosecond laser-pulse irradiation and that the transition dynamics are more electronic and coherent. Thus, strong terahertz-pulse irradiation is an effective approach to achieve a purely electronic Mott transition, enhancing the understanding of its quantum nature.
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Iwasa T, Tsurutani J, Mizuno Y, Kojima Y, Takashima T, Matsunami N, Morimoto T, Yamamura J, Ohtani S, Tanabe Y, Watanabe S, Kato R, Tanino H, Tokunaga S, Abe H, Tsuyuki S, Hara F, Takano T, Komoike Y, Nakagawa K. Phase II trial of eribulin and S-1 combination therapy for advanced or recurrent breast cancer. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx654.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Arai N, Kato Y, Hayashi T, Kato R, Tanahashi N, Takao M. Ischemic stroke with cardiac pacemaker implantation: Comparison of physiologic and ventricular pacing modes. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Masamune A, Kikuta K, Nabeshima T, Nakano E, Hirota M, Kanno A, Kume K, Hamada S, Ito T, Fujita M, Irisawa A, Nakashima M, Hanada K, Eguchi T, Kato R, Inatomi O, Shirane A, Takeyama Y, Tsuji I, Shimosegawa T. Nationwide epidemiological survey of early chronic pancreatitis in Japan. J Gastroenterol 2017; 52:992-1000. [PMID: 28130705 DOI: 10.1007/s00535-017-1311-8] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Accepted: 01/12/2017] [Indexed: 02/04/2023]
Abstract
BACKGROUND The world's first diagnostic criteria for early CP were proposed in 2009 in Japan. This study aimed to clarify the clinico-epidemiological features of early CP in Japan. METHODS Patients with early CP who were diagnosed according to the diagnostic criteria for early CP and had visited the selected hospitals in 2011 were surveyed. The study consisted of two-stage surveys: the number of patients with early CP was estimated by the first questionnaire and their clinical features were assessed by the second questionnaire. RESULTS The estimated number of early CP patients was 5410 (95% confidence interval 3675-6945), with an overall prevalence of 4.2 per 100,000 persons. The number of patients who were newly diagnosed with early CP was estimated to be 1330 (95% confidence interval 1058-1602), with an annual incidence of 1.0 per 100,000 persons. Detailed clinical information was obtained in 151 patients in the second survey. The male-to-female sex ratio was 1.32:1. The mean age was 60.4 and the mean age at disease onset was 55.4. Idiopathic (47.7%) and alcoholic (45.0%) were the two most common etiologies. Proportions of female and idiopathic cases were higher in early CP than in definite CP. Hyperechoic foci without shadowing and stranding were the most common findings on endoscopic ultrasonography. The clinical profiles of early CP patients who showed lobularity with honeycombing on endoscopic ultrasonography or previous episodes of acute pancreatitis were similar to those of definite CP patients. CONCLUSIONS We clarified the current status of early CP in Japan.
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Shimada M, Imano H, Fujiwara A, Hashimoto T, Kato R, Ijiri Y, Izumi Y, Yoshiyama M, Hayashi T. P5147Direct factor Xa inhibition prevents cardiac remodeling induced by intermittent hypoxia through PAR-1/2 dual signaling pathway. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p5147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Mori H, Kato R, Ikeda Y, Goto K, Asano S, Tanaka S, Shiki Y, Iwanaga S, Nishimura S, Muramatsu T, Matsumoto K. P1031Elevated brain natriuretic peptide level can predict the clinical course of paroxysmal atrioventricular block. Europace 2017. [DOI: 10.1093/ehjci/eux151.211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Mori H, Kato R, Ikeda Y, Goto K, Asano S, Tanaka S, Shiki Y, Iwanaga S, Nishimura S, Muramatsu T, Matsumoto K. P969Percutaneous lead extraction is safe and effective for right ventricular perforation. Europace 2017. [DOI: 10.1093/ehjci/eux151.151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Yano T, Isozaki T, Ueda S, Miyazaki N, Kurihara R, Kato R, Miyazono S. An Experimental Study of Blowdown Thrust and Jet Forces for a Pipe under Boiling Water Reactor Loss-of-Coolant Accident Conditions. NUCL SCI ENG 2017. [DOI: 10.13182/nse84-a18592] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Ishizuka M, Kato R, Moriya Y, Noguchi E, Koide Y, Inoue S, Itabe H, Yamamoto M. Changes in apolipoprotein B and oxidized low-density lipoprotein levels in gingival crevicular fluids as a result of periodontal tissue conditions. J Periodontal Res 2017; 52:594-602. [DOI: 10.1111/jre.12427] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/22/2016] [Indexed: 01/09/2023]
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Ito H, Hasegawa T, Moritake T, Kato R, Isaka K. Robot-Assisted Nerve Sparing Radical Hysterectomy in Japan. J Minim Invasive Gynecol 2016. [DOI: 10.1016/j.jmig.2016.08.067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Miyajima Tabata A, Komoriya K, Tanaka M, Hiruma H, Kato R, Haishima Y. Validation of haemocompatibility biomarkers for HEMA/MEA copolymers. Toxicol Lett 2016. [DOI: 10.1016/j.toxlet.2016.06.1370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Nakayama D, Nishi H, Kato R, Sagawa Y, Terauchi F, Isaka K. Biweekly administration of docetaxel and carboplatin for advanced or recurrent endometrial and ovarian carcinomas. EUR J GYNAECOL ONCOL 2016; 37:488-492. [PMID: 29894072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
OBJECTIVE To examine efficacy and safety of biweekly administration of docetaxel and carboplatin for advanced or recurrent en- dometrial and ovarian carcinomas. MATERIAL AND METHODS The recommended doses were determined in the phase I study. In the phase II feasibility study, the primary end-point was safety, and the secondary end-point was response rate and progression-free survival (PFS). RESULTS The recommended doses of docetaxel and carboplatin were determined to be 45 mg/n(2) and AUC 3.0, respectively, in phase I study. In phase II feasibility study, no treatment-related death was observed. Most non-hematotoxicity cases were mild or moderate. Grade 4 neutropenia was confirmed in 13 patients (31.0%), whereas all cases showed tolerability with 2.6 days delay of anticancer drugs administration in both groups. Response rate was 55.0% in the ovarian carcinoma group, and average PFS was 8.7 months. In the endometrial carcinoma group, response rate was 50.0% and average PFS was 32.0 months. CONCLUSION The present results showed that biweekly administration of docetaxel and carboplatin for advanced and recurrent endometrial and ovarian carcinomas results in acceptable side effects, response rate, and PFS.
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Suzuki Y, Matsushita S, Kubota H, Kobayashi M, Murauchi K, Higuchi Y, Kato R, Hirai A, Sadamasu K. Identification and functional activity of a staphylocoagulase type XI variant originating from staphylococcal food poisoning isolates. Lett Appl Microbiol 2016; 63:172-7. [PMID: 27227969 DOI: 10.1111/lam.12595] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Revised: 05/23/2016] [Accepted: 05/23/2016] [Indexed: 11/26/2022]
Abstract
UNLABELLED Staphylocoagulase, an extracellular protein secreted by Staphylococcus aureus, has been used as an epidemiological marker. At least 12 serotypes and 24 genotypes subdivided on the basis of nucleotide sequence have been reported to date. In this study, we identified a novel staphylocoagulase nucleotide sequence, coa310, from staphylococcal food poisoning isolates that had the ability to coagulate plasma, but could not be typed using the conventional method. The protein encoded by coa310 contained the six fundamental conserved domains of staphylocoagulase. The full-length nucleotide sequence of coa310 shared the highest similarity (77·5%) with that of staphylocoagulase-type (SCT) XIa. The sequence of the D1 region, which would be responsible for the determination of SCT, shared the highest similarity (91·8%) with that of SCT XIa. These results suggest that coa310 is a novel variant of SCT XI. Moreover, we demonstrated that coa310 encodes a functioning coagulase, by confirming the coagulating activity of the recombinant protein expressed from coa310. This is the first study to directly demonstrate that Coa310, a putative SCT XI, has coagulating activity. These findings may be useful for the improvement of the staphylocoagulase-typing method, including serotyping and genotyping. SIGNIFICANCE AND IMPACT OF THE STUDY This is the first study to identify a novel variant of staphylocoagulase type XI based on its nucleotide sequence and to demonstrate coagulating activity in the variant using a recombinant protein. Elucidation of the variety of staphylocoagulases will provide suggestions for further improvement of the staphylocoagulase-typing method and contribute to our understanding of the epidemiologic characterization of Staphylococcus aureus.
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