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Konegawa Y, Kuwahara T, Jo J, Murata K, Takeda T, Ikeda T, Minatoya K, Masumoto H, Tabata Y. Pioglitazone-incorporated microspheres alleviates cardiac dysfunction through macrophage polarization in a rat myocardial infarction model. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.2900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Inflammatory processes are essential for the repair processes after myocardial infarction. Among inflammatory cells involved in this process, macrophages play a critical role through polarization in pro-inflammatory M1 or reparative M2 subtype. Pioglitazone, known as a treatment drug for diabetes mellitus, is reported to regulate macrophage polarization toward reparative M2 subtype. Poly L-lactic-co-glycolic acid (PLGA) has been widely accepted as the delivery carrier in drug delivery system (DDS).
Here, we aimed to validate the therapeutic effects and investigate the mechanisms of DDS-based treatment using pioglitazone to left ventricular remodeling after myocardial infarction.
Pioglitazone-incorporated PLGA microspheres (PGZ-MS) were prepared and the drug release profile was evaluated. The concentration of interleukin-10 secreted from murine bone marrow derived macrophages incubated with PGZ-MS was quantified in the culture supernatant. To validate the therapeutic potential of PGZ-MS in vivo, Sprague-Dawley rats were subjected to permanent left coronary artery ligation to induce myocardial infarction. Mock-MS (100 μg) or PGZ-MS (100 μg) was injected to the infarct region just after induction (n=9–11/group). Cardiac function and left ventricular size were assessed by echocardiography. At 28-day after surgery, rats were sacrificed, and excised hearts were evaluated histologically.
PGZ-MS released 1.8±0.3% of incorporated PGZ within 24 hours and 29.5±1.2% within 14 days indicating sustained release of PGZ in vitro. PGZ-MS augmented Interleukin-10 release from bone marrow derived macrophages, indicating polarization toward reparative M2 subtype. PGZ-MS significantly ameliorated cardiac function after myocardial infarction (fractional shortening: MI vs MI+Mock-MS vs MI+PGZ-MS, 24.4±1.1 vs 24.3±1.6 vs 32.2±1.4%; P=0.0035) with reverse remodeling (wall thickness: MI vs MI+Mock-MS vs MI+PGZ-MS, 0.69±0.12 vs 0.71±0.13 vs 1.06±0.09; P=0.03). Immunohistochemical analyses revealed that PGZ-MS enhanced macrophage polarization toward reparative M2 subtype (ratio of reparative M2 macrophages: 0.39±0.03 vs 0.42±0.02 vs 0.54±0.02; P=0.0004) and attenuated apoptosis of cardiomyocytes in the ischemic border zone (MI vs MI+Mock-MS vs MI+PGZ-MS, 2.6±0.2 vs 1.9±0.2 vs 1.2±0.2 cells/field; P=0.002).
In the present study, we confirmed that PGZ-MS could realize sustained release of pioglitazone which resulted in sustained effect of macrophage polarization and attenuated left ventricular remodeling accompanied with the amelioration of cardiac dysfunction and cardiomyocytes apoptosis. The strategy of DDS-based macrophage polarization might serve as a promising strategy in cardiac regenerative therapy for ischemic heart disease in the future.
Funding Acknowledgement
Type of funding sources: Public grant(s) – National budget only. Main funding source(s): Grants-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture of Japan
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Affiliation(s)
- Y Konegawa
- Kyoto University, Department of Cardiovascular Surgery , Kyoto , Japan
| | - T Kuwahara
- Kyoto University, Department of Biomaterials, Institute for Frontier Life and Medical Sciences , Kyoto , Japan
| | - J Jo
- Kyoto University, Department of Biomaterials, Institute for Frontier Life and Medical Sciences , Kyoto , Japan
| | - K Murata
- Kyoto University, Department of Cardiovascular Surgery , Kyoto , Japan
| | - T Takeda
- Kyoto University, Department of Cardiovascular Surgery , Kyoto , Japan
| | - T Ikeda
- Kyoto University, Department of Cardiovascular Surgery , Kyoto , Japan
| | - K Minatoya
- Kyoto University, Department of Cardiovascular Surgery , Kyoto , Japan
| | - H Masumoto
- Kyoto University, Department of Cardiovascular Surgery , Kyoto , Japan
| | - Y Tabata
- Kyoto University, Department of Biomaterials, Institute for Frontier Life and Medical Sciences , Kyoto , Japan
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Kamada A, Kuwahara T. LHC lifetime frontier and visible decay searches in composite asymmetric dark matter models. J High Energy Phys 2022; 2022:176. [PMID: 35370396 PMCID: PMC8959273 DOI: 10.1007/jhep03(2022)176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 03/17/2022] [Accepted: 03/22/2022] [Indexed: 06/14/2023]
Abstract
The LHC lifetime frontier will probe dark sector in near future, and the visible decay searches at fixed-target experiments have been exploring dark sector. Composite asymmetric dark matter with dark photon portal is a promising framework explaining the coincidence problem between dark matter and visible matter. Dark strong dynamics provides rich structure in the dark sector: the lightest dark nucleon is the dark matter, while strong annihilation into dark pions depletes the symmetric components of the dark matter. Dark photons alleviate cosmological problems. Meanwhile, dark photons make dark hadrons long-lived in terrestrial experiments. Moreover, the dark hadrons are produced through the very same dark photon. In this study, we discuss the visible decay searches for composite asymmetric dark matter models. For a few GeV dark nucleons, the LHC lifetime frontier, MATHUSLA and FASER, has a potential to discover their decay when kinetic mixing angle of dark photon is ϵ ≳ 10 -4. On the other hand, fixed-target experiments, in particular SeaQuest, will have a great sensitivity to dark pions with a mass below GeV and with kinetic mixing ϵ ≳ 10 -4 in addition to the LHC lifetime frontier. These projected sensitivities to dark hadrons in dark photon parameter space are comparable with the future sensitivities of dark photon searches, such as Belle-II and LHCb.
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Affiliation(s)
- Ayuki Kamada
- Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, ul. Pasteura 5, PL–02–093 Warsaw, Poland
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, 277-8583 Japan
- Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS), Daejeon, 34126 Korea
| | - Takumi Kuwahara
- Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS), Daejeon, 34126 Korea
- Center for High Energy Physics, Peking University, Beijing, 100871 China
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Takasugi N, Goto H, Verrier R, Takasugi M, Kuwahara T, Nakashima T, Kubota T, Kawasaki M, Nishigaki K, Minatoguchi S. P5503Effect of beta-blockade on quantitative microvolt T-wave alternans measured in 24-hour continuous 12-lead ECGs in patients with long QT syndrome. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p5503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Yamaoka H, Nakayama-Imaohji H, Horiuchi I, Yamasaki H, Nagao T, Fujita Y, Maeda H, Goda H, Kuwahara T. Tetramethylbenzidine method for monitoring the free available chlorine and microbicidal activity of chlorite-based sanitizers under organic-matter-rich environments. Lett Appl Microbiol 2015; 62:47-54. [DOI: 10.1111/lam.12506] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Revised: 09/25/2015] [Accepted: 10/05/2015] [Indexed: 11/27/2022]
Affiliation(s)
- H. Yamaoka
- Department of Microbiology; Faculty of Medicine; Kagawa University; Kagawa Japan
- Honbu Sankei Co. Ltd.; Chuou-ku Osaka Japan
| | - H. Nakayama-Imaohji
- Department of Microbiology; Faculty of Medicine; Kagawa University; Kagawa Japan
| | - I. Horiuchi
- Department of Microbiology; Faculty of Medicine; Kagawa University; Kagawa Japan
- Honbu Sankei Co. Ltd.; Chuou-ku Osaka Japan
| | - H. Yamasaki
- Department of Cellular and Molecular Medicine; Wakayama Medical University Graduate School of Medicine; Wakayama Japan
| | - T. Nagao
- Faculty of Nursing; Shikoku University; Tokushima Japan
| | - Y. Fujita
- Honbu Sankei Co. Ltd.; Chuou-ku Osaka Japan
| | - H. Maeda
- Faculty of Fisheries; Kagoshima University; Kagoshima-shi Kagoshima Japan
| | - H. Goda
- Honbu Sankei Co. Ltd.; Chuou-ku Osaka Japan
| | - T. Kuwahara
- Department of Microbiology; Faculty of Medicine; Kagawa University; Kagawa Japan
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Kuwahara T, Markert M, Wauters JP. Protein adsorption on dialyzer membranes influences their biocompatibility properties. Contrib Nephrol 2015; 74:52-7. [PMID: 2562019 DOI: 10.1159/000417470] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- T Kuwahara
- Division of Nephrology, University Hospital, Lausanne, Switzerland
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Imataki O, Kita N, Nakayama-Imaohji H, Kida JI, Kuwahara T, Uemura M. Bronchiolitis and bacteraemia caused by Burkholderia gladioli in a non-lung transplantation patient. New Microbes New Infect 2014; 2:175-6. [PMID: 25566397 PMCID: PMC4265050 DOI: 10.1002/nmi2.64] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Revised: 08/03/2014] [Accepted: 08/28/2014] [Indexed: 11/21/2022] Open
Affiliation(s)
- O Imataki
- Division of Haematology and Stem Cell Transplantation, Department of Internal Medicine, Faculty of Medicine, Kagawa University Kagawa, Japan
| | - N Kita
- Division of Respiratory Medicine, Department of Internal Medicine, Faculty of Medicine, Kagawa University Kagawa, Japan
| | - H Nakayama-Imaohji
- Division of Molecular Microbiology, Faculty of Medicine, Kagawa University Kagawa, Japan
| | - J-I Kida
- Division of Haematology and Stem Cell Transplantation, Department of Internal Medicine, Faculty of Medicine, Kagawa University Kagawa, Japan
| | - T Kuwahara
- Division of Molecular Microbiology, Faculty of Medicine, Kagawa University Kagawa, Japan
| | - M Uemura
- Division of Haematology and Stem Cell Transplantation, Department of Internal Medicine, Faculty of Medicine, Kagawa University Kagawa, Japan
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Kuwahara T, Takahashi A, Okubo K, Takagi K, Yamao K, Nakashima E, Kawaguchi N, Takigawa M, Watari Y, Sugiyama T, Handa K, Kimura S, Hikita H, Sato A, Aonuma K. Oesophageal cooling with ice water does not reduce the incidence of oesophageal lesions complicating catheter ablation of atrial fibrillation: randomized controlled study. Europace 2014; 16:834-9. [DOI: 10.1093/europace/eut368] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Abstract
OBJECTIVES To investigate the prevalence of Parkinson's disease (PD) and atypical parkinsonian syndromes (APS) in a rural Japanese district. METHOD Collaboration with the medical institutions, the long-term care insurance system facilities, and the public health office. RESULTS The crude prevalence rates were 175 per 100,000 (95% CI: 143-206) for PD, 18 (8-28) for progressive supranuclear palsy, 17 (7-26) for multiple system atrophy (MSA), and 9 (2-16) for corticobasal degeneration. The age-adjusted prevalence rates were 109 per 100,000 (88-134), 10 (2-17), 13 (4-21), and 6 (0-12), for each condition. There was a preponderance of women with PD and of men with APS. Nine of the 116 PD patients and 7 of the 29 APS patients were newly diagnosed in this study. CONCLUSIONS There are high prevalence rates for PD and APS and suboptimal recognition of APS. This is the first epidemiological prevalence study of MSA from Japan.
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Affiliation(s)
- Y Osaki
- Department of Geriatrics, Cardiology and Neurology, Kochi Medical School, Nankoku, Japan.
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Kuriyama H, Sano K, Ishida S, Nohda T, Aya Y, Kuwahara T, Noguchi S, Kiyama S, Tsuda S, Nakano S. Lateral Grain Growth in the Excimer Laser Crystallization of Poly-Si. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-321-657] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTWe have succeeded in obtaining nondoped, thin poly-Si film (thickness ∼500Å) with excellent crystallinity and large grain size (Maximum grain size ∼4.5 μ m) by an excimer laser annealing Method, which offers the features of low-temperature processing and a short processing time. The grain size distribution shrinks in the region around 1.5 μ m and this poly-Si film exhibits a strong (111) crystallographic orientation. Poly-Si thin film transistors using these films show quite a high field effect mobility of 440cm2/V · s below 600°C process.
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Kishi J, Nishioka Y, Kuwahara T, Kakiuchi S, Azuma M, Aono Y, Makino H, Kinoshita K, Kishi M, Batmunkh R, Uehara H, Izumi K, Sone S. Blockade of Th1 chemokine receptors ameliorates pulmonary granulomatosis in mice. Eur Respir J 2011; 38:415-24. [PMID: 21273392 DOI: 10.1183/09031936.00070610] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Sarcoidosis is a granulomatous disease of unknown aetiology. We identified immunological targets for the treatment of pulmonary granulomatosis using a murine model generated with Propionibacterium acnes. Sensitisation and challenge using heat-killed P. acnes and dendritic cells (DCs) were performed to produce pulmonary granulomatosis in C57BL/6 mice. Immunological analyses using ELISA as well as cDNA microarray analysis were used to search for cytokines or chemokines associated with the formation of granulomas in the lungs. Co-administration of P. acnes and DCs reproducibly induced the formation of pulmonary granulomas, which resembled sarcoid granulomas. The cDNA microarray assay demonstrated that the gene expression of CXCL9 and CXCL10, ligands for CXCR3, and of CCL4, a ligand for CCR5, was strongly upregulated during granulomatosis. ELISA confirmed that levels of CXCL9 and CXCL10 as well as T-helper (Th)1 cytokines and chemokines including tumour necrosis factor-α and interferon-γ were elevated in bronchoalveolar lavage fluid (BALF). The blockade of Th1 chemokine receptors using TAK-779, a dual blocker for CXCR3 and CCR5, led to reduced numbers of CXCR3+CD4+ and CCR5+CD4+ T-cells in BALF. Furthermore, administration of TAK-779 ameliorated the granulomatosis. The targeted inhibition of Th1 chemokines might be useful for inhibiting Th1-biased granulomatous diseases, including sarcoidosis.
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Affiliation(s)
- J Kishi
- Department of Respiratory Medicine and Rheumatology, University of Tokushima Graduate School, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan
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Miyazaki S, Kuwahara T, Kobori A, Takahashi Y, Takei A, Sato A, Isobe M, Takahashi A. Long-term clinical outcome of extensive pulmonary vein isolation-based catheter ablation therapy in patients with paroxysmal and persistent atrial fibrillation. Heart 2010; 97:668-73. [DOI: 10.1136/hrt.2009.186874] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Miyazaki S, Kuwahara T, Kobori A, Takahashi Y, Takei A, Sato A, Isobe M, Takahashi A. Pharmacological cardioversion preceding left atrial ablation: bepridil predicts the clinical outcome following ablation in patients with persistent atrial fibrillation. Europace 2009; 11:1620-3. [DOI: 10.1093/europace/eup363] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Watanabe N, Yashima M, Takeuchi T, Sakaguchi H, Goto H, Kuwabara N, Kuwahara T. [Myers technique and patch enlargement of ascending aorta for diffuse supravalvular aortic stenosis]. Kyobu Geka 2009; 62:1061-1064. [PMID: 19894571] [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: 05/28/2023]
Abstract
A 6-year-old boy was diagnosed with aggravation of diffuse supravalvular aortic stenosis (SVAS). The pressure gradient between the sinus of Valsalva and ascending aorta was 48 mmHg. The diameter of the sino-tubular junction was 7 mm and the ascending aorta was hypoplastic. We performed Myers operation because 3 sinus reconstructions had resulted in superior hemodynamics and reductions in both mortality rate and need for reoperation. We avoided using autologous pericardium because of the possibility of shrinkage and aneurysm. We could easily perform patch enlargement of the ascending aorta by selective cerebral perfusion. The postoperative course was excellent and there was no SVAS or aortic regurgitation (AR). A catheterization showed the pressure gradient was 5 mmHg with trivial AR upon follow-up at 1 year.
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Affiliation(s)
- N Watanabe
- Department of Congenital Cardiovascular Surgery, Gifu General Hospital, Gifu, Japan
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Yashima M, Takeuchi T, Watanabe N, Kuwahara T, Kuwabara N, Goto H, Sakaguchi H. [Stenosis of left coronary artery ostium by a hypoplastic cusp]. Kyobu Geka 2009; 62:354-357. [PMID: 19425372] [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: 05/27/2023]
Abstract
Occlusion of a coronary ostium due to fusion of the aortic cusp to the aortic wall is a rare but noteworthy anomaly, because it may cause a sudden death. We report a 9-year-old girl with severe stenosis of the left coronary ostium by the aortic cusp that fused to the aortic wall. The left coronary flow was restored by excision of the adherent left aortic cusp, and aortic valve replacement was performed with the technique of bilateral enlargement of the aortic valve ring (Yamaguchi's method) to prevent prosthesis-patient mismatch in the future. The patient had an uneventful recovery and was discharged 14th postoperative day (POD). Postoperative angiography showed no coronary ostial stenosis.
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Affiliation(s)
- Masafumi Yashima
- Department of Pediatric Cardiac Surgery, Gifu Prefectural General Medical Center, Gifu, Japan
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Iwai I, Kuwahara T, Hirao T. Vol. 42, No. 1, pp.16-21, 2008
Decrease in the skin transparency induced by protein carbonylation in the stratum corneum. Int J Cosmet Sci 2009. [DOI: 10.1111/j.1468-2494.2008.00450_3.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: 11/30/2022]
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Nagae T, Mori K, Mukoyama M, Kasahara M, Yokoi H, Suganami T, Sawai K, Yoshioka T, Koshikawa M, Saito Y, Ogawa Y, Kuwabara T, Tanaka I, Sugawara A, Kuwahara T, Nakao K. Adrenomedullin inhibits connective tissue growth factor expression, extracellular signal-regulated kinase activation and renal fibrosis. Kidney Int 2008; 74:70-80. [DOI: 10.1038/ki.2008.98] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kuwahara T, De Vuyst F, Yamaguchi H. Flow regime classification in air-magnetic fluid two-phase flow. J Phys Condens Matter 2008; 20:204141. [PMID: 21694270 DOI: 10.1088/0953-8984/20/20/204141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A new experimental/numerical technique of classification of flow regimes (flow patterns) in air-magnetic fluid two-phase flow is proposed in the present paper. The proposed technique utilizes the electromagnetic induction to obtain time-series signals of the electromotive force, allowing us to make a non-contact measurement. Firstly, an experiment is carried out to obtain the time-series signals in a vertical upward air-magnetic fluid two-phase flow. The signals obtained are first treated using two kinds of wavelet transforms. The data sets treated are then used as input vectors for an artificial neural network (ANN) with supervised training. In the present study, flow regimes are classified into bubbly, slug, churn and annular flows, which are generally the main flow regimes. To validate the flow regimes, a visualization experiment is also performed with a glycerin solution that has roughly the same physical properties, i.e., kinetic viscosity and surface tension, as a magnetic fluid used in the present study. The flow regimes from the visualization are used as targets in an ANN and also used in the estimation of the accuracy of the present method. As a result, ANNs using radial basis functions are shown to be the most appropriate for the present classification of flow regimes, leading to small classification errors.
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Affiliation(s)
- T Kuwahara
- Ecole Centrale Paris, Laboratoire Mathématiques Appliquées aux Systèmes, Grande Voie des Vignes 92295 Châtenay-Malabry, France. Department of Mechanical Engineering, Doshisha University, 1-3 Tataramiyakodani, Kyotanabe-shi, Kyoto 610-0321, Japan
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Kawamata Y, Kuwahara T, Kodama R, Yoneda J, Torii K, Sakai R. LB034 DIETARY GLUTAMIC ACID INCREASED POSTPRANDIAL AVAILABILITY OF ALANINE AND BRANCHED CHAIN AMINO ACIDS IN RATS. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/s1744-1161(08)70514-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ko KS, Kuwahara T, Haehwa L, Yoon YJ, Kim BJ, Lee KH, Ohnishi Y, Kook YH. RNA polymerase β-subunit gene (rpoB) sequence analysis for the identification of Bacteroides spp. Clin Microbiol Infect 2007; 13:48-54. [PMID: 17184287 DOI: 10.1111/j.1469-0691.2006.01553.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [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: 11/30/2022]
Abstract
Partial rpoB sequences (317 bp) of 11 species of Bacteroides, two Porphyromonas spp. and two Prevotella spp. were compared to delineate the genetic relationships among Bacteroides and closely related anaerobic species. The high level of inter-species sequence dissimilarities (7.6-20.8%) allowed the various Bacteroides spp. to be distinguished. The position of the Bacteroides distasonis and Bacteriodes merdae cluster in the rpoB tree was different from the position in the 16S rRNA gene tree. Based on rpoB sequence similarity and clustering in the rpoB tree, it was possible to correctly re-identify 80 clinical isolates of Bacteroides. In addition to two subgroups, cfiA-negative (division I) and cfiA-positive (division II), of Bacteroides fragilis isolates, two distinct subgroups were also found among Bacteroides ovatus and Bacteroides thetaiotaomicron isolates. Bacteroides genus-specific rpoB PCR and B. fragilis species-specific rpoB PCR allowed Bacteroides spp. to be differentiated from Porphyromonas and Prevotella spp., and also allowed B. fragilis to be differentiated from other non-fragilisBacteroides spp. included in the present study.
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Affiliation(s)
- K S Ko
- Asian-Pacific Research Foundation for Infectious Diseases (ARFID) and Sungkyunkwan University School of Medicine, Seoul, Korea
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Watanabe N, Yashima M, Takeuchi T, Sakaguchi H, Goto H, Kuwabara N, Kuwahara T. [Primary biventricular repair for interrupted aortic arch with left ventricular outflow tract obstruction and tricuspid valve regurgitation; report of a case]. Kyobu Geka 2006; 59:1107-9. [PMID: 17094551] [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: 05/12/2023]
Abstract
An interrupted aortic arch was diagnosed in a 10-day-old girl weighing 3.3 kg, as was perimembranous ventricular septal defect (VSD) and severe tricuspid valve regurgitation (TR). The subaortic diameter was 3.6 mm and the aortic valve (3.7 mm in diameter) was bicuspid. We chose definitive repair, modified Yasui procedure, because of severe TR and no straddling of mitral valve. In primary biventricular repair, we undertook extended aortic arch anastomosis. Left ventricular outflow tract reconstruction consisted of intracardiac rerouting from the VSD to the pulmonary artery by using expanded-polytetrafluoroethylene (ePTFE) and Damus-Kaye-Stansel (DKS) anastomosis. Right ventricular outflow tract reconstruction was performed by the Rastelli procedure with an ePTFE valved conduit. Moreover, we carried out semicircular annuloplasty for severe TR.
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Affiliation(s)
- N Watanabe
- Department of Congenital Cardiovascular Surgery, Gifu Hospital, Gifu, Japan
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Shamsuddin AKM, Kuwahara T, Oue A, Nomura C, Koga S, Inoue Y, Kondo N. Effect of skin temperature on the ion reabsorption capacity of sweat glands during exercise in humans. Eur J Appl Physiol 2005; 94:442-7. [PMID: 15843956 DOI: 10.1007/s00421-005-1354-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/21/2005] [Indexed: 10/25/2022]
Abstract
The effect of skin temperature on the ion reabsorption capacity of sweat glands during exercise in humans is unknown. In this study, eight healthy subjects performed a 60-min cycling exercise at a constant intensity (60% VO(2max)) under moderate (25 degrees C) and cool (15 degrees C) ambient temperatures at a constant relative humidity of 40%. The sweating rate (SR), index of sweat ion concentration (ISIC) by using sweat conductivity, esophageal temperature (Tes), mean skin temperature, and heart rate (HR) were measured continuously under both ambient temperatures. The SR and ISIC were significantly lower at the cool ambient temperature versus the moderate temperature. There were no significant differences in the changes in HR and esophageal temperature between these ambient temperature conditions, while the mean skin temperature was significantly lower at the cool ambient temperature by almost 3 degrees C (P < 0.05). The slopes of the relationships between Tes and the SR and ISIC were significantly lower and the thresholds of these relationships were significantly higher at the cool ambient temperature (P < 0.05). The ion reabsorption capacity of the sweat glands was significantly lower (P < 0.05) in a cool environment (0.21 +/- 0.04 vs. 0.52 +/- 0.06 mg/cm(2)/min at 15 and 25 degrees C, respectively) as evaluated using the relationships for SR and ISIC. The results suggest that the ion reabsorption capacity of the sweat glands is influenced by skin temperature during exercise in humans.
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Affiliation(s)
- A K M Shamsuddin
- Laboratory for Applied Human Physiology, Faculty of Human Development, Kobe University, Nada-ku, Japan
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Shamsuddin AKM, Yanagimoto S, Kuwahara T, Zhang Y, Nomura C, Kondo N. Changes in the index of sweat ion concentration with increasing sweat during passive heat stress in humans. Eur J Appl Physiol 2005; 94:292-7. [PMID: 15765239 DOI: 10.1007/s00421-005-1314-7] [Citation(s) in RCA: 19] [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] [Accepted: 01/10/2005] [Indexed: 10/25/2022]
Abstract
To investigate the pattern changes in the index of sweat ion concentration at skin surface with increasing sweat during passive heat stress in humans, we measured conductivity of the perfused water with sweat as the index of sweat ion concentration and sweat rate, continuously at the chest skin surface. Eight healthy subjects (22.4 +/-1.0 years) were passively heated by lower-leg immersion in a hot water bath of 42 degrees C for 50 min in an ambient temperature of 28 degrees C and relative humidity of 50%. The internal temperature (Tor) thresholds of sweat rate and index of sweat ion concentration were almost similar. Concomitant onset for the index of sweat ion concentration and sweat rate occurred but two types of linear regression lines were identified in the relationship between the index of sweat ion concentration and sweat rate at a boundary sweat rate value of 0.30 +/- 0.08 mg cm(-2) min(-1). The slope of the regression line at low levels of sweat (slope 0.02 +/- 0.01 V mg(-1) cm(-2) min(-1)) was significantly gradual compared with that at moderate levels of sweat (slope 0.30 +/- 0.08 V mg(-1) cm(-2) min(-1)) (P<0.05). These results suggest that at low levels of sweat the index of sweat ion concentration responds gradually with respect to sweat rate, which may be due to the ion reabsorption capacity of the sweat duct, and then the index of sweat ion concentration increased steeply with sweat rate.
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Affiliation(s)
- A K M Shamsuddin
- Laboratory for Applied Human Physiology, Faculty of Human Development, Kobe University, 3-11Tsurukabuto, Nada-ku, Kobe 657-8501, Japan
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25
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Takiguchi M, Takeuchi T, Yashima M, Kuwahara T, Kuwabara N, Goto H, Adachi S. [Sandwich technique for closing of the large muscular Swiss-cheese type ventricular septal defects]. Kyobu Geka 2005; 58:123-7. [PMID: 15724474] [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: 05/01/2023]
Abstract
A 9-year-old girl, who has had a diagnosis as a Taussig-Bing anomary, underwent an original Jatene procedure (o-J) 2 months after birth. This time, she had a diagnosis of the muscular multiple ventricular septal defects (mVSD) and pulmonary stenosis after o-J. The mVSD was Swiss-cheese type and was large from the proximal of the infundibular septum to the apex and posterior of the septum. It was closed by the sandwich technique using a pair of felt patches, which of one was placed at right ventricular side and the other was at left ventricular side, slightly larger than the whole area of the mVSD. The patch fixation was placed with 1 stitch at the center between the patches and a few stitches around the right ventricular side patch to the ventricular septum. Postoperative cardiac function was uneventful regardless of the very large patches placed at the ventricular septum and the cardiac catheterization after 1 year postoperatively showed the pulmonary/systemic blood flow ratio was 1.0. This technique for the closure of the large Swiss-cheese type mVSD can be considered to be very effective.
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Affiliation(s)
- Makoto Takiguchi
- Department of Pediatric Cardiac Surgery, Gifu Prefectural Gifu Hospital, Gifu, Japan
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26
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Kasuno K, Ueda S, Tanaka A, Tanaka-Kasuno Y, Kuwahara T. Pulmonary angiomyolipoma recurring 26 years after nephrectomy for angiomyolipoma: benign clinical course. Clin Nephrol 2005; 62:469-72. [PMID: 15630908 DOI: 10.5414/cnp62469] [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: 11/18/2022] Open
Abstract
Angiomyolipoma (AML), a benign renal tumor, has various clinical forms, and the nature of AML is not sufficiently understood because of few reports of long-term observation. We report a 57-year-old female without tuberous sclerosis who developed multiple pulmonary AML 26 years after a right nephrectomy for renal AML. A computed tomogram demonstrated multifocal round lesions with lipid-like density throughout both lung fields. An open lung biopsy revealed a histological diagnosis of pulmonary AML. An abdominal computed tomogram was also compatible with splenic AML. She has been in good health for 12 years since the lung biopsy over the 38 years since the nephrectomy. This case suggests that multicentric AML can recur at distant organs even after long-term silence in a patient who has a past history of renal AML.
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Affiliation(s)
- K Kasuno
- Department of Biological Responses, Laboratory of Infection and Prevention, Institute for Virus Research, Kyoto University, Kyoto, Japan
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27
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Bunpo P, Kataoka K, Arimochi H, Nakayama H, Kuwahara T, Bando Y, Izumi K, Vinitketkumnuen U, Ohnishi Y. Inhibitory effects of Centella asiatica on azoxymethane-induced aberrant crypt focus formation and carcinogenesis in the intestines of F344 rats. Food Chem Toxicol 2004; 42:1987-97. [PMID: 15500935 DOI: 10.1016/j.fct.2004.06.022] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [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: 11/07/2003] [Accepted: 06/24/2004] [Indexed: 11/21/2022]
Abstract
Effects of the water extract of Centella asiatica Linn. on formation of azoxymethane (AOM)-induced aberrant crypt foci (ACF) and intestinal tumorigenesis in male F344 rats were investigated. Treatment with the extract significantly decreased the number of larger ACF (with four or more crypts per focus) in the large intestine in the early stage, while the number of methylated DNA adducts was not decreased compared with that in the AOM-treated group. In the post-initiation stage, the extract significantly decreased the total number of ACF and the number of larger ACF, accompanied by a decrease in the 5-bromo-2'-deoxyuridine-labeling index and an increase in the induction of apoptotic cells in the colonic mucosa. The incidences of neoplasms, the numbers of adenocarcinomas in the small intestines and entire intestines, and sizes of neoplasms in the entire intestines in rats fed C. asiatica extract at a dose of 10 mg/kg were smaller than those in rats given AOM alone (p < 0.05). The extract at a dose of 100 mg/kg significantly reduced the multiplicity of neoplasms in the small intestine (p < 0.05). These results suggest that inhibition of the formation of AOM-induced ACF by C. asiatica extract is associated with modification of cell proliferation and induction of apoptosis in colonic crypts and that the extract has a chemopreventive effect on colon tumorigenesis.
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Affiliation(s)
- P Bunpo
- Department of Molecular Bacteriology, Graduate School of Medicine, The University of Tokushima, Tokushima 770-8503, Japan
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Murakami E, Nagatsu M, Takeuchi T, Yashima M, Kuwahara T, Yamada K, Kuwabara N, Goto H, Nagasawa H. [Successful staged repair of a symptomatic neonate of tetralogy of Fallot with severe absent pulmonary valve syndrome]. Kyobu Geka 2004; 57:921-7. [PMID: 15462340] [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: 04/30/2023]
Abstract
Tetralogy of Fallot with absent pulmonary valve has been classified to a few groups. The most severe one is characterized by symptomatic onset immediately after birth. The others are no or slightly symptomatic at least during their neonatal period. In a severely symptomatic 12-day-old neonate of tetralogy of Fallot with absent pulmonary valve who had required intubation immediately after birth, tight pulmonary banding and left side modified Blalock-Taussig shunt were performed on emergency basis. Consequently, prior massive pulmonary regurgitation was decreased significantly. Forty-five days after this first stage operation, he weaned from respiratory management. At 1-year-old, radical repair based on conotruncal repair, which consisted of patch closure of ventricular septal defect preserving the tricuspid septal leaflet function, resection of anterior wall of enlarged left pulmonary artery, and right ventricular outflow tract reconstruction using autologous tissue and a pericardial patch was performed. Bicuspid pulmonary valve, posterior one of procured autologous pulmonary wall and anterior one of polytetrafluoroethylene (PTFE) respectively, was created to minimize deterioration of the pulmonary insufficiency. Although postoperative cardiac function was kept feasible showing his central venous pressure of 7 mmHg in the main, postoperative general course was eventful especially regarding the respiratory function. The patient was weaned from the prolonged ventilator management 5 months after this radical repair eventually. Generally, to diminish the massive pulmonary regurgitation in early lifetime period could reduce a progressive airway obstruction and minimize pulmonary tissue damage. However, even after the total correction in this case, considerable peripheral segmental pulmonary obstructive lesions were persistent according to the perfusion lung scanning with 99mTc macroaggregated albumin and 99mTechnegas ventilation lung scanning studies. This persistent, supposed to be innate, pulmonary obstructive lesions might prevent ordinal recovery after cardiac radical repair for this most severe subtype of absent pulmonary valve syndrome.
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Affiliation(s)
- Eiji Murakami
- Department of Pediatric Cardiac Surgery, Gifu Prefectural Gifu Hospital, Gifu, Japan
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29
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Takiguchi M, Yashima M, Takeuchi T, Adachi S, Goto H, Kuwabara N, Kuwahara T. [Valvuloplasty for mitral regurgitation immediately following Kawasaki disease without abnormal coronary arteries lesion; report of a case]. Kyobu Geka 2004; 57:969-72. [PMID: 15462350] [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: 04/30/2023]
Abstract
It is not uncommon that valve disease is complicated with Kawasaki disease (KD). However, it is rare to show normal coronary arteries simultaneously. We experienced a case of valvuloplasty towards the mitral regurgitation (MR) followed immediately after KD showing normal coronary arteries. A 3 year-old-female, with a diagnosis of KD at 4 months after birth, was referred to our hospital 5 months after birth. The echocardiography detected a moderate MR. The preoperative catheterization at 2.5 years old showed grade III MR, enlargement of left atrium and left ventricle, pulmonary capillary wedge pressure (PCWP) = 12 mmHg, left ventricular ejection fraction (LVEF) = 675, and normal coronary arteries. Pulmonary hypertention was not revealed. The operative findings showed mitral valve prolapse due to the elongation of the chordae of the anterior leaflet. She underwent artificial chordal reconstruction using expanded polytetrafluoroethylene sutures and mitral annuloplasty by Kay-Reed method. The postoperative course was uneventful, and she was discharged on postoperative day 19.
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Affiliation(s)
- Makoto Takiguchi
- Department of Pediatric Cardiac Surgery, Gifu Prefectural Gifu Hospital, Gifu, Japan
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30
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Sawada N, Kataoka K, Kondo K, Arimochi H, Fujino H, Takahashi Y, Miyoshi T, Kuwahara T, Monden Y, Ohnishi Y. Betulinic acid augments the inhibitory effects of vincristine on growth and lung metastasis of B16F10 melanoma cells in mice. Br J Cancer 2004; 90:1672-8. [PMID: 15083202 PMCID: PMC2409700 DOI: 10.1038/sj.bjc.6601746] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
We examined the antitumour effect of a combination of betulinic acid (BA) and vincristine (VCR) on murine melanoma B16F10 cells in vitro and in vivo. Betulinic acid, a pentacyclic triterpene, showed a synergistic cytotoxic effect on melanoma cells by combinational use of VCR. Betulinic acid and VCR induced cell cycle arrest at different points (BA at G1 phase and VCR at G2/M phase) and caused apoptosis in B16F10 melanoma cells. In the in vivo study, VCR inhibited metastasis of tumour cells to the lung. The addition of BA to VCR augmented suppression of the experimental lung metastasis of melanoma cells in C57BL/6 mice. The number of lung nodules of more than 1 mm in diameter in mice treated with BA and VCR was less than that in mice treated with VCR alone. These results suggest that BA is an effective supplement for enhancing the chemotherapeutic effect on malignant melanoma.
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Affiliation(s)
- N Sawada
- Department of Oncological and Regenerative Surgery, School of Medicine, The University of Tokushima, Tokushima 770-8503, Japan
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Kondo N, Yanagimoto S, Kuwahara T, Zhang Y, Koga S, Inoue Y. Heat Loss Responses at the Onset of Dynamic Exercise in Endurancetrained Men Under Mildly Heated Conditions. Med Sci Sports Exerc 2004. [DOI: 10.1249/00005768-200405001-01506] [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: 11/21/2022]
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32
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Shamsuddin AK, Kuwahara T, Zhang Y, Ooue A, Nomura C, Kondo N. Effects of Ambient Temperature on Sweat Ion Reabsorption Capacity During Exercise in Humans. Med Sci Sports Exerc 2004. [DOI: 10.1249/00005768-200405001-01508] [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: 11/21/2022]
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33
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Shamsuddin AKM, Yanagimoto S, Kuwahara T, Zhang Y, Nomura C, Kondo N. CHANGES IN SWEAT RATE AND SWEAT CONDUCTIVITY DURING PASSIVE HEATING IN HUMANS. Med Sci Sports Exerc 2003. [DOI: 10.1097/00005768-200305001-00156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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34
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Kuroiwa K, Nakayama H, Kuwahara T, Tamagawa K, Hattori K, Murakami K, Korai H, Ohnishi Y. Augmenting effect of acetic acid for acidification on bactericidal activity of hypochlorite solution. Lett Appl Microbiol 2003; 36:46-9. [PMID: 12485341 DOI: 10.1046/j.1472-765x.2003.01261.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [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
AIMS Bactericidal activity of chlorine solution is enhanced by weak acidification. We compared the effects of various acids on the bactericidal activity of hypochlorite solution to establish a method for safe and effective use of an acidic hypochlorite solution. METHODS AND RESULTS The bactericidal activities of acidic hypochlorite solutions that had been adjusted to pH 5.0 with hydrochloric acid, acetic acid, citric acid, lactic acid, formic acid, phosphoric acid or sulphuric acid against Bacillus subtilis spores were compared. The acidic solutions prepared with hydrochloric acid and acetic acid showed the highest bactericidal activity, and all of the spores (5 x 106 cfu ml(-1)) were killed within 10 min. On the other hand, the solutions prepared with citric acid and lactic acid showed no bactericidal activity against any bacterial strains tested in this study despite the low pH. The amount of chlorine gas produced by the preparation using acetic acid was sixfold less than that produced from the preparation using hydrochloric acid. CONCLUSIONS Acetic acid is the most suitable and safe acid for the preparation of an acidic hypochlorite solution. SIGNIFICANCE AND IMPACT OF THE STUDY The results of this study provide useful information for establishing a method for safe and effective use of an acidic hypochlorite solution.
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Affiliation(s)
- K Kuroiwa
- Department of Molecular Bacteriology, Graduate School of Medicine, The University of Tokushima, Tokushima, Japan
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35
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Wada Y, Yamaguchi T, Kuwahara T, Sugiyama Y, Kikukawa H, Ueda S. Primitive neuroectodermal tumour of the kidney with spontaneous regression of pulmonary metastases after nephrectomy. BJU Int 2003; 91:121-2. [PMID: 12614265 DOI: 10.1046/j.1464-410x.2003.04019.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- Y Wada
- Department of Urology, Kumamoto University School of Medicine, Kumamoto National Hospital, Kumamoto, Japan.
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36
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Kawano K, Kojima S, Hirakawa K, Yang X, Hori T, Kuwahara T, Kamimura Y, Satake S, Maeda H, Miyajima H, Nagata R. Mature Ovarian Teratoma in a Cynomolgus Monkey (Macaca fascicularis). J Toxicol Pathol 2003. [DOI: 10.1293/tox.16.283] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- Kazuki Kawano
- Drug Safety Research Laboratories, Toxicological Pathology Group, Shin Nippon Biomedical Laboratories, Ltd
| | - Seiji Kojima
- Drug Safety Research Laboratories, Toxicological Pathology Group, Shin Nippon Biomedical Laboratories, Ltd
| | - Kimiaki Hirakawa
- Drug Safety Research Laboratories, Toxicological Pathology Group, Shin Nippon Biomedical Laboratories, Ltd
| | - Xiuying Yang
- Drug Safety Research Laboratories, Toxicological Pathology Group, Shin Nippon Biomedical Laboratories, Ltd
| | - Takao Hori
- Drug Safety Research Laboratories, Toxicological Pathology Group, Shin Nippon Biomedical Laboratories, Ltd
| | - Takumi Kuwahara
- Drug Safety Research Laboratories, Toxicological Pathology Group, Shin Nippon Biomedical Laboratories, Ltd
| | - Yoshihiro Kamimura
- Drug Safety Research Laboratories, Toxicological Pathology Group, Shin Nippon Biomedical Laboratories, Ltd
| | - Shigeru Satake
- Drug Safety Research Laboratories, Toxicological Pathology Group, Shin Nippon Biomedical Laboratories, Ltd
| | - Hiroshi Maeda
- Drug Safety Research Laboratories, Toxicological Pathology Group, Shin Nippon Biomedical Laboratories, Ltd
| | - Hiroaki Miyajima
- Drug Safety Research Laboratories, Toxicological Pathology Group, Shin Nippon Biomedical Laboratories, Ltd
| | - Ryoichi Nagata
- Drug Safety Research Laboratories, Toxicological Pathology Group, Shin Nippon Biomedical Laboratories, Ltd
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37
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38
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Muso E, Mune M, Fujii Y, Imai E, Ueda N, Hatta K, Imada A, Takemura T, Miki S, Kuwahara T, Takamitsu Y, Tsubakihara Y. Significantly rapid relief from steroid-resistant nephrotic syndrome by LDL apheresis compared with steroid monotherapy. Nephron Clin Pract 2001; 89:408-15. [PMID: 11721158 DOI: 10.1159/000046112] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [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: 11/19/2022] Open
Abstract
Rapid amelioration of hypercholesterolemia by LDL apheresis (LDL-A) was performed for long-standing nephrotic syndrome (NS) with hyperlipidemia due to focal segmental glomerulosclerosis (FGS) and the clinical data and prognosis were compared between LDL-A-treated and nontreated groups. Seventeen steroid-resistant NS patients treated with LDL-A (LDL-A group) and 10 NS patients treated with steroids only (steroid-monotherapy (SM) group) were compared. Serum cholesterol and phospholipid levels were significantly lowered only in the LDL-A group (p < 0.01, respectively). The LDL-A group showed a significant decrease of urinary protein (UP, p < 0.01) and increase of serum albumin (p < 0.05). Average time needed to achieve a decrease of UP to less than nephrotic range (< 3.5 g/day) was significantly shorter in the LDL-A group than in the SM group (p < 0.01). Although this is not a prospective study, it is highly expected that a rapid improvement of hypercholesterolemia by LDL-A in steroid-resistant NS will provide more rapid relief from NS than steroid therapy alone.
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Affiliation(s)
- E Muso
- Kyoto University Graduate School of Medicine, Kyoto, Japan.
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39
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Takahashi K, Kuwahara T, Nagatsu M. Changes in 99mTechnegas ventilation lung scan in a newborn with absent pulmonary valve syndrome. Cardiol Young 2001; 11:673-5. [PMID: 11813924 DOI: 10.1017/s1047951101001093] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
A newborn infant with tetralogy of Fallot and absent pulmonary valve was successfully corrected in two stages. Absent pulmonary valve syndrome presenting in early infancy manifests severe respiratory symptoms that still make challenging both management and surgical treatment. This is ascribed to tracheobronchial compression by the extremely dilated pulmonary arteries, and to the resultant pulmonary obstructive lesions. We report herein the first findings of 99mTechnegas ventilation lung scanning in an infant with the syndrome to assess the pulmonary obstructive lesions.
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Affiliation(s)
- K Takahashi
- Department of Pediatric Cardiology, Gifu Prefecture Hospital, Japan.
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Kuwahara T, Norimatsu I, Nakayama H, Akimoto S, Kataoka K, Arimochi H, Ohnishi Y. Genetic variation in 16S-23S rDNA internal transcribed spacer regions and the possible use of this genetic variation for molecular diagnosis of Bacteroides species. Microbiol Immunol 2001; 45:191-9. [PMID: 11345528 DOI: 10.1111/j.1348-0421.2001.tb02607.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [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: 11/27/2022]
Abstract
The structural variation in 16S-23S rDNA internal transcribed spacer regions (ITS) among Bacteroides species was assessed by PCR amplification and sequencing analysis, and its possible use for molecular diagnosis of these species was evaluated. Ninety strains of the genus Bacteroides, including the species B. distasonis, B. eggerthii, B. fragilis, B. ovatus, B. thetaiotaomicron, B. uniformis and B. vulgatus, produced one to three ITS amplification products with sizes ranging from 615 to 810 bp. Some Bacteroides strains could be differentiated at species level on the basis of ITS amplification patterns and restriction fragment length polymorphism (RFLP) analysis using a four-nucleotide-recognizing enzyme, Msp I. The results of sequence analysis of ITS amplification products revealed genes for Ile-tRNA and Ala-tRNA in all strains tested. The nucleotide sequence, except for that in tRNA-coding regions, was highly variable and characteristic for each species, but a common sequence among B. fragilis, B. thetaiotaomicron and B. ovatus was observed. A digoxigenin-labeled oligonucleotide probe (named FOT1), which was designed from this conserved sequence, specifically hybridized to the ITS amplification products from B. fragilis, B. thetaiotaomicron and B. ovatus. These results suggest that the ITS region is a useful target for the development of rapid and accurate techniques for identification of Bacteroides species.
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Affiliation(s)
- T Kuwahara
- Department of Bacteriology, School of Medicine, The University of Tokushima, Tokushima, Japan
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41
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Abstract
A case report of a neonate with cardiac tumors in association with tuberous sclerosis is presented. The rare complication of pulmonary embolism and its successful treatment by anticoagulation and thrombolytic therapy is described. The treatment of these cardiac tumors is conservative, because the tumors regress spontaneously when the diagnosis is made in infancy. However, embolic event may rarely occur as a complication of cardiac tumors. If the cardiac tumors are treated conservatively, it is important to pay close attention to the occurrence of pulmonary embolism during the follow-up period.
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Affiliation(s)
- N Kuwabara
- Department of Pediatric Cardiology, Gifu Prefectural Hospital, 4-6-1 Noishiki, Gifu 500-8717, Japan
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42
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Yokoi H, Nakata M, Sawai K, Yoshida T, Koshikawa M, Joyama S, Tanaka A, Goto M, Ueda S, Senzaki H, Sugawara A, Kuwahara T. Intraglomerular metastasis from pancreatic cancer. Am J Kidney Dis 2001; 37:1299-303. [PMID: 11382703 DOI: 10.1053/ajkd.2001.24541] [Citation(s) in RCA: 13] [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] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Few case reports have shown the presence of metastatic tumor cells in renal glomeruli. We report one case with intraglomerular metastasis proved at renal biopsy. A 60-year-old man suffered from weight loss and fever of unknown origin. Urinalysis revealed proteinuria with cellular and granular casts. Because vasculitis was suspected, renal biopsy was performed. Presence of tumor cells occupying the glomerular capillary lumina was shown by means of light microscopy and electron microscopy. Laboratory findings revealed elevated leukocyte count (28.9 x 10(3)/mm(3)), serum granulocyte colony-stimulating factor (G-CSF) (77 pg/mL), and serum CA 19-9 (21,885 U/mL). The patient soon developed disseminated intravascular coagulation and died. Autopsy findings revealed pancreatic cancer showing positive staining for G-CSF and CA 19-9. Tumor cells in the glomerular capillary lumina showed positive staining for CA 19-9 and proliferating cell nuclear antigen (PCNA). These results suggest that the pancreatic tumor cells producing G-CSF were entrapped in the glomerular capillary lumina where they proliferated. This may have been the first step in renal metastasis.
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Affiliation(s)
- H Yokoi
- Departments of Nephrology, Respiratory Medicine, and Pathology, Saiseikai Nakatsu Hospital, Osaka, Japan
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Abstract
OBJECTIVE The purpose of this article was to study and clarify the features of Chinese herb nephropathy (CHN) in Japan. PATIENTS AND METHODS The subjects consisted of patients diagnosed as having CHN in Saiseikai Nakatsu Hospital and of those reported in the literature in Japan. We investigated the clinical and histological features of CHN patients in Japan and compared them with the Belgian cases. RESULTS The remarkable differences were as follows: (1) high prevalence in males compared with Belgian cases, (2) Fanconi syndrome was found in most cases, (3) no patients had malignant tumors in the urinary tract. In addition, the ascribed Chinese medicines in Japan were divided into three groups: 'Tenshin-toki-shigyaku-ka-gosyuyu-syokyo-to', 'Boui-ougi-to', and others. CONCLUSION CHN in Japan has some characteristics distinguished from Belgian nephropathy. One hypothesis is a susceptibility to aristolochic acids (AAs), which is considered to be a causative agent, may be different among races. Another is that there could be some other toxic substances affecting the clinical findings although they are not identified at present. Further studies must be undertaken to clarify these differences.
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Affiliation(s)
- A Tanaka
- Department of Nephrology, Osaka Saiseikai Nakatsu Hospital
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Chiampanichayakul S, Kataoka K, Arimochi H, Thumvijit S, Kuwahara T, Nakayama H, Vinitketkumnuen U, Ohnishi Y. Inhibitory effects of bitter melon (Momordica charantia Linn.) on bacterial mutagenesis and aberrant crypt focus formation in the rat colon. J Med Invest 2001; 48:88-96. [PMID: 11286022] [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: 02/19/2023]
Abstract
Antimutagenicity and chemopreventive activity of an 80%-ethanol extract of bitter melon (Momordica charantia Linn.) against the formation of azoxymethane (AOM)-induced aberrant crypt foci (ACF) was investigated. The bitter melon extract was nonmutagenic and inhibited the mutagenicity of heterocyclic amines 2-amino-3,4-dimethylimidazo[4,5-f]quinoline and 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine, and aflatoxin B1 in the Salmonella mutation assay. To examine the inhibitory effect of bitter melon on AOM-induced ACF formation, male F344 rats were fed various concentrations of the extract (0.1, 0.5, and 1.0 g/kg body weight) for five weeks during the initiation stage. One week after the administration of the plant extract, rats were subcutaneously given AOM at 15 mg/kg body weight once a week for two weeks. Three rats in each group were sacrificed 12 hr after the second AOM injection to analyze DNA adducts, O6-methylguanine (O6-meG) and N7-methylguanine in the liver and colon. The remaining rats were sacrificed 3 weeks after the second AOM injection to observe ACF. To examine the inhibitory effect of the extract on ACF formation in the postinitiation stage, rats were fed the extract at 0.1 and 1.0 g/kg body weight for 12 weeks starting two weeks after the second AOM injection. Treatment with bitter melon extract significantly inhibited ACF formation in the colon during the initiation stage and dose-dependently decreased the average of O6-meG DNA adduct in the colonic mucosa. During the postinitiation stage, bitter melon extract, at 1.0 g/kg body weight, significantly inhibited ACF formation in the colon, especially the formation of ACF with four or more crypts per focus. These findings suggest that bitter melon is a possible chemopreventive agent against colon carcinogenesis.
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Affiliation(s)
- S Chiampanichayakul
- Department of Bacteriology, University of Tokushima School of Medicine, Tokushima, Japan
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45
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Kuwahara T, Nakayama H, Miki T, Kataoka K, Arimochi H, Ohnishi Y. PCR-dot blot hybridization based on the neuraminidase-encoding gene is useful for detection of Bacteroides fragilis. J Med Invest 2001; 48:60-5. [PMID: 11286018] [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: 02/19/2023]
Abstract
Bacteroides fragilis is a Gram-negative obligate anaerobe frequently isolated from clinical specimens and sometimes causes severe septicemia in compromised hosts. Increasing interest has been shown in the enterotoxigenicity and drug resistance of B. fragilis in the field of medical microbiology. We previously reported rapid detection of this anaerobe by nested PCR targeting a neuraminidase-encoding gene nanH. In the present study, we synthesized a digoxigenin-labeled oligonucleotide probe, NH1, which is specific for nanH of B. fragilis, and we combined the hybridization assay using NH1 with the nanH-PCR to detect this anaerobe in a bacteremia model mice. In the specificity test, the oligonucleotide probe, NH1, hybridized only to amplification products from B. fragilis. PCR-dot blot hybridization based on nanH enabled detection of cells of B. fragilis in blood samples even when the number was as low as 2 x 10(3) colony-forming units/ml. These findings suggest that PCR-dot blot hybridization targeting nanH is a useful procedure for diagnosis of septicemia caused by B. fragilis when viable cells in blood cannot be detected by the traditional culture techniques.
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Affiliation(s)
- T Kuwahara
- Department of Bacteriology, University of Tokushima School of Medicine, Tokushima, Japan
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Abstract
A seven-month old female with a huge aneurysm of the right common iliac artery and multiple stenoses of her bilateral renal arteries is described. At surgery, a Gore-Tex graft was interposed between the proximal common iliac artery and the external iliac artery. A histological examination of the aneurysmal wall was compatible with medial fibromuscular dysplasia (FMD). After surgery, her blood pressure was controlled in the normal range on medical treatment. This case would be the first case of a huge common iliac artery aneurysm due to FMD in infants.
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Affiliation(s)
- N Kuwabara
- Department of Pediatric Cardiology, Gifu Prefectural Hospital, Japan
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Joyama S, Yoshida T, Koshikawa M, Sawai K, Yokoi H, Tanaka A, Gotoh M, Ueda S, Sugawara A, Kuwahara T. C4d and C4bp deposition along the glomerular capillary walls in a patient with preeclampsia. Am J Kidney Dis 2001; 37:E6. [PMID: 11136195 DOI: 10.1016/s0272-6386(01)90003-4] [Citation(s) in RCA: 11] [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: 11/24/2022]
Abstract
Complement (C) 4d and cofactor C4b binding protein (C4bp) are detected in the glomerular capillary walls of a patient with preeclampsia. A 32-year-old nullipara had proteinuria of 1.2 g/d and edema at the 33rd week of pregnancy. Gradually the urinary protein excretion increased, reaching 5.1 g/d at the 37th week. The patient also showed hypertension at this stage. After normal mature delivery, the level of the urinary protein excretion remained at 3 to 4 g/d. Renal biopsy performed by means of light and electron microscopy, 15 days after delivery, showed almost normal glomeruli and modest subendothelial widening. Immunohistochemistry indicated that immunoglobulin (Ig) A, IgG, C1q, C3c, and C4c were not deposited in the glomeruli, whereas weakly positive IgM and fibrin-related antigen (FRA) were observed. Conversely, C4d, C3d, and C4bp were strongly deposited. Protein S (PS) also was observed, with a similar distribution pattern to that of C4bp. Immunoelectron microscopy showed the deposition of C4d along the capillary walls and of C4bp in the subendothelium. These findings suggest that the C4 activation process as well as the regulation process of C system and of the inflammatory coagulation axis by C4bp and PS may play an important role in the pathophysiology of preeclampsia, so-called glomerular capillary endotheliosis (GCE).
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Affiliation(s)
- S Joyama
- Department of Nephrology, Saiseikai Nakatsu Hospital, Osaka, Japan
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48
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Tanaka A, Nishida R, Yokoi H, Kuwahara T. The characteristic pattern of aminoaciduria in patients with aristolochic acid-induced Fanconi syndrome: could iminoaciduria be the hallmark of this syndrome? Clin Nephrol 2000; 54:198-202. [PMID: 11020017] [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: 02/17/2023] Open
Abstract
BACKGROUND In Japan the patients with Chinese herbs nephropathy (CHN), aristolochic acids-(AAs) associated renal failure, often present Fanconi syndrome. The aim of this study was to investigate the pattern of aminoaciduria in patients with AAs-induced Fanconi syndrome and to clarify whether it is different from other Fanconi syndromes reported in the literature. SUBJECTS AND METHODS The subjects consisted of 4 patients with Fanconi syndrome due to AAs. We studied biochemical data and urinary excretion of amino acids in the 4 patients. Amino acids in their urine were analyzed by high performance liquid chromatography (HPLC). RESULTS Three out of 4 patients showed in common very increased excretion ofproline, hydroxyproline and citruline. Last patient showed the very increased levels of proline and valine. Regarding glycine, which is considered to belong to the same group as imino acid and to be shared with high-affinity transport system ofproline, there was not very increased excretion. CONCLUSION These findings suggest that AAs would predominantly affect the low-affinity transport system of proline in the brushborder membrane of proximal tubules because the low-affinity system is considered not to be shared with glycine transport.
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Affiliation(s)
- A Tanaka
- Department of Nephrology, Saiseikai Nakatsu Hospital, Osaka, Japan
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49
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Abstract
BACKGROUND Dent's disease is an X-linked renal tubular disorder that is characterized by low molecular weight proteinuria, hypercalciuria, nephrolithiasis, and renal failure. The disease is caused by inactivation of a renal chloride channel gene, CLCN5, that encodes a 746-amino acid protein with 12 to 13 transmembrane domains. The Japanese variant of Dent's disease has been observed to be less severe, and we have investigated two unrelated Japanese families for CLCN5 mutations. METHODS Six patients from two unrelated families were studied. Leukocyte DNA from probands was used with CLCN5-specific primers for polymerase chain reaction (PCR) amplification of the coding region and exon-intron boundaries, and the DNA sequences of the products were determined to identify abnormalities in the gene. RNA extracted from the kidney, leukocytes, or urine sediments was used to characterize further the effects of the identified mutations. RESULTS beta2-microglobulinuria was detected in five patients, hypercalciuria in two patients, nephrolithiasis in three patients (2 of whom were females), and one 51-year-old man had renal failure. Two novel CLCN5 mutations consisting of an a to g transition at the invariant ag acceptor splice site of intron 5 and an intragenic deletion that encompassed the region between intron 3 and intron 6 were identified. The acceptor splice site mutation led to the utilization of two alternative cryptic splice sites in exon 6 that resulted in a frameshift or skipping of the exon 6. The deletional mutation, which resulted in a loss of exons 4, 5, and 6, is predicted to lead to a loss of domains 1 through 4. Both mutations predict truncated chloride channels that are likely to result in a functional loss. CONCLUSIONS The observations of renal failure in one male and nephrolithiasis in two females represent important new findings in this Japanese variant of Dent's disease that is associated with CLCN5 mutations. In addition, our study is the first to demonstrate the use of urinary sediment cells and renal tissue for the detection of CLCN5 transcript abnormalities. These results help to expand the spectrum of CLCN5 mutations associated with Dent's disease.
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Affiliation(s)
- T Igarashi
- Department of Pediatrics, Faculty of Medicine, The University of Tokyo, Japan.
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Sasaki O, Kuwahara T, Hara R, Suzuki T. Sinusoidal wavelength-scanning interferometric reflectometry. Appl Opt 2000; 39:3847-3853. [PMID: 18349961 DOI: 10.1364/ao.39.003847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We propose interferometric reflectometry in which a sinusoidal wavelength-scanning tunable laser diode is used to detect positions and profiles of multiple reflecting surfaces. An objective signal extracted from an interference signal contains modulation amplitude Z and phase alpha, which are related to the positions and profiles, respectively, of multiple reflecting surfaces. By using values of the objective signal at special times, we can produce an image intensity that shows where the reflecting surfaces exist. To obtain exact values of Z or values of alpha, we estimated the objective signal by using a conjugate gradient method. Experimental results show that a resolution of two-optical-path difference (OPD) in the image intensity is approximately 60 microm, and the final OPD precisions are 2 and 8 microm for two and three reflecting surfaces, respectively, for a wavelength-scanning width of 7 nm. Profiles of the front and rear surfaces of a silica glass plate with a thickness of 20 microm have been measured with a precision of approximately 10 nm.
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Affiliation(s)
- O Sasaki
- Faculty of Engineering, Niigata University, 8050 Ikarashi 2, Niigata-shi 950-2181, Japan.
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