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Okumura Y, Watanabe I, Nagashima K, Sonoda K, Sasaki N, Kogawa R, Takahashi K, Iso K, Ohkubo K, Nakai T, Takahashi R, Taniguchi Y, Mitsumata M, Nikaido M, Hirayama A. Effects of a high-fat diet on the electrical properties of porcine atria. J Arrhythm 2015; 31:352-8. [PMID: 26702314 PMCID: PMC4672030 DOI: 10.1016/j.joa.2015.05.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Revised: 04/06/2015] [Accepted: 05/11/2015] [Indexed: 11/10/2022] Open
Abstract
Background Because obesity is an important risk factor for atrial fibrillation (AF), we conducted an animal study to examine the effect of a high-fat diet (HFD) on atrial properties and AF inducibility. Methods Ten 8-week-old pigs (weight, 18–23 kg) were divided into two groups. For 18 weeks, five pigs were fed a HFD (HFD group) and five were fed a normal diet (control group). Maps of atrial activation and voltages during sinus rhythm were created for all pigs using the EnSite NavX system. Effective refractory period (ERP) and AF inducibility were also determined. When AF was induced, complex fractionated atrial electrogram (CFAE) mapping was performed. At 18 weeks, hearts were removed for comparing the results of histological analysis between the two groups. Body weight, lipid levels, hemodynamics, cardiac structures, and electrophysiological properties were also compared. Results Total cholesterol levels were significantly higher (347 [191–434] vs. 81 [67–88] mg/dL, P=0.0088), and left atrium pressure was higher (34.5 [25.6–39.5] vs. 24.5 [21.3–27.8] mmHg, P=0.0833) in the HFD group than in the control group, although body weight only increased marginally (89 [78–101] vs. 70 [66–91] kg, P=0.3472). ERPs of the pulmonary vein (PV) were shorter (P<0.05) and AF lasted longer in the HFD group than in the control group (80 [45–1350] vs. 22 [3–30] s, P=0.0212). Neither CFAE site distribution nor histopathological characteristics differed between the two groups. Conclusions The shorter ERPs for the PV observed in response to the HFD increased vulnerability to AF, and these electrophysiological characteristics may underlie obesity-related AF.
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Miwa Y, Takahashi R, Yajima N, Wakabayashi K, Tokunaga T, Ishii S, Nishimi A, Kasama T, Oh K, Toyoshima Y, Inagaki K. AB0329 A Study on Characteristics of Rheumatoid Arthritis Patients Achieving HAQ Remission with 6 Months of Biologic Treatment. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.1138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Kawai D, Takahashi R, Kamima T, Baba H, Yamamoto T, Kubo Y, Ishibashi S, Higuchi Y, Takahashi H, Tachibana H. SU-E-T-50: A Multi-Institutional Study of Independent Dose Verification Software Program for Lung SBRT. Med Phys 2015. [DOI: 10.1118/1.4924411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Miwa Y, Takahashi R, Isojima S, Isozaki T, Saito M, Oguro N, Nishimi S, Kasama T, Oh K, Toyoshima Y, Inagaki K. AB0328 A Study on Characteristics of Rheumatoid Arthritis Patients Achieving Clinical Remission After 6 Months of Treatment with Biologic Agents. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.1124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Yanai R, Miwa Y, Kasama T, Yajima N, Isozaki T, Wakabayashi K, Takahashi R, Isojima S, Furuya H, Saito M. SAT0085 Study of Prognostic Factors Associated with Death from Pneumocystis Pneumonia Complicated by Collagen Diseases. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.5425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Miwa Y, Takahashi R, Yanai R, Furuya H, Umemura M, Miura Y, Kasama T, Oh K, Toyoshima Y, Inagaki K, Hosaka M. AB0406 A Study on Characteristics of Rheumatoid Arthritis Patients Achieving no Depression with 6 Months of Biologic Treatment. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.1137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Maolake A, Izumi K, Takahashi R, Itai S, Machioka K, Yaegashi H, Nohara T, Kitagawa Y, Kadono Y, Konaka H, Mizokami A, Namiki M. Efficacy of tegafur-uracil in advanced urothelial cancer patients after the treatment failure of platinum-based chemotherapy. Anticancer Res 2015; 35:1603-1606. [PMID: 25750316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
BACKGROUND Platinum-based chemotherapy is the first-line treatment for advanced urinary tract urothelial cancers. However, the optimal second-line treatment is unclear. Although tegafur-uracil is sometimes used for advanced urothelial cancer patients after the treatment failure of platinum-based chemotherapy, there is little evidence regarding its use as a second-line treatment. PATIENTS AND METHODS Advanced urothelial cancer patients previously treated with platinum-based chemotherapy were retrospectively analyzed. Overall survival (OS) was compared between patients with and without tegafur-uracil treatment. RESULTS Thirty-one patients (27 and 4 patients with and without tegafur-uracil treatment, respectively) were analyzed. OS from the last day of the final chemotherapy course was better in patients with tegafur-uracil treatment than in those without (p<0.001, 358 and 66.5 days of the median survival time, respectively). CONCLUSION Tegafur-uracil may be a candidate for the secondary treatment of advanced urothelial cancer patients after the treatment failure of platinum-based chemotherapy.
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Hara R, Fukuoka T, Takahashi R, Utsumi Y, Yamaguchi A. Surface-enhanced Raman spectroscopy using a coffee-ring-type three-dimensional silver nanostructure. RSC Adv 2015. [DOI: 10.1039/c4ra09309g] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
We demonstrated surface-enhanced Raman spectroscopy using a coffee-ring-type three-dimensional silver nanostructure (Ag3D).
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Bian M, Liao Y, Schmidt RL, Njogu MM, Takahashi R, Walton ZE, Tang AH. Abstract 1965: Inhibiting SIAH2 E3 ligase function disrupts focal adhesion and cell junction, inhibits cell mobility and attachment, and blocks tumor invasion and metastasis in oncogenic K-Ras-driven tumors. Cancer Res 2014. [DOI: 10.1158/1538-7445.am2014-1965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Oncogenic EGFR/HER2/K-RAS activation is known to reduce focal adhesion and cell attachment, alter cell junction, and increase cell motility during normal tissue development as well as tumor invasion and cancer metastasis. Deciphering the mechanisms that promote cancer cell dissemination and metastasis in response to oncogenic ERBB/K-RAS “pathway” activation and finding novel targets for inhibiting invasion and metastasis remains an important goal in cancer biology. SIAH2, the human homologue of a highly conserved RING-domain E3 ubiquitin ligase SINA that is the most downstream signal modulator identified in Drosophila RAS signaling pathway, is critically required for proper mammalian ERBB/K-RAS signal transduction. SIAH2 insufficiency was shown to impede oncogenic K-RAS signal transduction, thereby obstructing K-RAS-driven tumorigenesis and metastasis in the preclinical models. However, the exact molecular mechanism of SIAH2 function downstream of the oncogenic ERBB/K-RAS activation remains to be characterized in human cancer cells.
In this study, we use immunoprecipitation to isolate novel SIAH2-interacting proteins from multiple highly aggressive human cancer cells with oncogenic K-RAS hyperactivation. Three LIM-domain focal adhesion proteins (Trip6/FHL2/LPXN) were identified by Mass Spectrometry analysis, and their interactions with SIAH2 were verified biochemically by bi-directional co-immunoprecipitation (co-IP). Trip6/FHL2/LPXN has been reported to play important roles in cell focal adhesion formation and cell migration. We demonstrated that SIAH2 biochemically interacts with, ubiquitinates and thereby causes the degradation of these LIM domain proteins, demonstrating that TRIP6, FHL2 and LPXN are bona fide SIAH2 substrates in vivo. Our immunofluorescence (IF) staining results showed that SIAH2-deficiency disrupts Trip6/FHL2/LPXN localization at the focal adhesion site, results in defects in focal adhesion, cell junction, cell attachment and cell motility. Conversely, ectopic expression of TRIP6, FHL2 and LPXN can partially rescue SIAH2-deficient cancer cells from the pronounced defects in cell motility, cell death and tumor growth. The discovery that SIAH2 directly modulates focal adhesion may provide a novel molecular mechanism to explain the well-documented increases in cancer cell dissemination, tumor invasion and metastasis in response to ERBB/K-RAS pathway activation in human cancer cells. We may have uncovered a novel function of SIAH in modulating focal adhesion and cell junction in human cancer cells. By circumventing EGFR/HER2/K-RAS signaling pathway at its most downstream signaling module, we hope to validate and develop novel anti-SIAH-based anti-K-RAS anticancer therapies against oncogenic K-RAS-driven tumors in the future.
Citation Format: Ming Bian, Yang Liao, Rebecca L. Schmidt, Monicah M. Njogu, Rie Takahashi, Zandra E. Walton, Amy H. Tang. Inhibiting SIAH2 E3 ligase function disrupts focal adhesion and cell junction, inhibits cell mobility and attachment, and blocks tumor invasion and metastasis in oncogenic K-Ras-driven tumors. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 1965. doi:10.1158/1538-7445.AM2014-1965
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Takahashi R. O3.15: Nationwide survey on the incidence of cardio-pulmonary arrest during bathing. Eur Geriatr Med 2014. [DOI: 10.1016/s1878-7649(14)70143-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Matsuzaki H, Iwata M, Miyamoto T, Terashige T, Iwano K, Takaishi S, Takamura M, Kumagai S, Yamashita M, Takahashi R, Wakabayashi Y, Okamoto H. Excitation-photon-energy selectivity of photoconversions in halogen-bridged Pd-chain compounds: Mott insulator to metal or charge-density-wave state. PHYSICAL REVIEW LETTERS 2014; 113:096403. [PMID: 25215998 DOI: 10.1103/physrevlett.113.096403] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Indexed: 06/03/2023]
Abstract
Ultrafast photoinduced transitions of a one-dimensional Mott insulator into two distinct electronic phases, metal and charge-density-wave (CDW) state, were achieved in a bromine-bridged Pd-chain compound [Pd(en)2Br](C5-Y)2H2O (en=ethylenediamine and C5-Y=dialkylsulfosuccinate), by selecting the photon energy of a femtosecond excitation pulse. For the resonant excitation of the Mott-gap transition, excitonic states are generated and converted to one-dimensional CDW domains. For the higher-energy excitation, free electron and hole carriers are produced, giving rise to a transition of the Mott insulator to a metal. Such selectivity in photoconversions by the choice of initial photoexcited states opens a new possibility for the developments of advanced optical switching and memory functions.
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Okada T, Ikebe K, Inomata C, Takeshita H, Uota M, Mihara Y, Matsuda K, Kitamura M, Murakami S, Gondo Y, Kamide K, Masui Y, Takahashi R, Arai Y, Maeda Y. Association of periodontal status with occlusal force and food acceptability in 70-year-old adults: from SONIC Study. J Oral Rehabil 2014; 41:912-9. [DOI: 10.1111/joor.12214] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/01/2014] [Indexed: 11/28/2022]
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Otsuka K, Miwa Y, Oguro N, Miura Y, Ishii S, Seki S, Furuya H, Yanai R, Takahashi R, Wakabayashi K, Isozaki T, Yajima N, Kasama T. AB0493 Tacrolimus Therapy for Systemic Lupus Erythematosus with or without Renal Involvement during the Maintenance Phase. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.1627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Horikoshi M, Inokuma S, Kobuna M, Matsubara E, Okada R, Takahashi R, Kobayashi S, Kijima Y. AB0989 Uneven Temperature among Fingers after Cold-Water Immersion of Hands is A Useful Parameter to Identify Disturbed Peripheral Circulation in Patients with Raynaud Phenomenon. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.4849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Fumuro T, Matsumoto R, Matsuhashi M, Usami K, Shimotake A, Kunieda T, Takahashi R, Fukuyama H, Ikeda A. P372: Scalp-recorded slow potentials during neuro-feedback training well reflects cortical activity? Clin Neurophysiol 2014. [DOI: 10.1016/s1388-2457(14)50481-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Inano R, Sawamoto N, Kunieda T, Kikuchi T, Tabu H, Okada T, Togashi K, Takahashi R, Fukuyama H, Miyamoto S. P304: Striatal dopamine depletion lead to altered functional connectivity with the thalamus in Parkinson’s disease: a PET and fMRI study. Clin Neurophysiol 2014. [DOI: 10.1016/s1388-2457(14)50425-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Koganemaru S, Ikeda A, Takahashi R, Fukuyama H, Mima T. P645: Case report: seizure induction by single-pulse transcranial magnetic stimulation after anodal transcranial direct current stimulation in a stroke patient. Clin Neurophysiol 2014. [DOI: 10.1016/s1388-2457(14)50740-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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118
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Tachibana H, Kamima T, Takahashi R, Baba H. SU-E-T-505: CT-Based Independent Dose Verification for RapidArc Plan as a Secondary Check. Med Phys 2014. [DOI: 10.1118/1.4888838] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Takahashi R, Akizawa Y, Uchida A, Harayama T, Tsuzuki K, Sunada S, Arai K, Yoshimura K, Davis P. Fast physical random bit generation with photonic integrated circuits with different external cavity lengths for chaos generation. OPTICS EXPRESS 2014; 22:11727-11740. [PMID: 24921295 DOI: 10.1364/oe.22.011727] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We generate random bit sequences from chaotic temporal waveforms by using photonic integrated circuits (PICs) with different external cavity lengths. We investigate the condition for generating random bits at different sampling rates of single-bit generation method with the PICs. We succeed in generating certified random bit sequences by using the PIC with 3, 4, 5, or 10-mm-long external cavity, whereas random bits cannot pass all the statistical tests of randomness when the PIC with 1 or 2 mm-long external cavity is used.
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Feng Z, Takahashi R, Nakamura T, Sato D, Shirasawa N, Nakayama A, Kurashige S, Kosawada T, Kitajima T, Umezu M. Expression of microRNA-1, microRNA-133a and Hand2 protein in cultured embryonic rat cardiomyocytes. In Vitro Cell Dev Biol Anim 2014; 50:700-6. [PMID: 24789724 DOI: 10.1007/s11626-014-9755-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Accepted: 04/05/2014] [Indexed: 12/12/2022]
Abstract
In this study, we investigated the expression of the pathway, SRF-microRNA-1/microRNA-133a-Hand2, in the Wistar rat embryonic ventricular cardiomyocytes under conventional monolayer culture. The morphological observation of the cultured cardiomyocytes and the mRNA expression levels of three vital constituent proteins, MLC-2v, N-cadherin, and connexin43, demonstrated the immaturity of these cultured cells, which was featured by less myofibril density, immature sarcomeric structure, and significantly lower mRNA expression of the three constituent proteins than those in neonatal ventricular samples. More importantly, results in this study suggest that the change of SRF-microRNA-1/microRNA-133a-Hand2 pathway results into the attenuation of the Hand2 repression in cultured cardiomyocytes. These outcomes are valuable to understand the cellular state as embryonic cardiomyocytes to be in vitro model and might be useful for the assessment of engineered cardiac tissue and cardiac differentiation of stem cells.
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Fukuta S, Takahashi R, Kuroyanagi S, Ishiguro Y, Miyake N, Nagai H, Suzuki H, Tsuji T, Hashizume F, Watanabe H, Kageyama K. Development of loop-mediated isothermal amplification assay for the detection of Pythium myriotylum. Lett Appl Microbiol 2014; 59:49-57. [PMID: 24612040 DOI: 10.1111/lam.12244] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Revised: 02/28/2014] [Accepted: 03/03/2014] [Indexed: 11/27/2022]
Abstract
UNLABELLED This study reports the development of a loop-mediated isothermal amplification (LAMP) reaction for the detection of Pythium myriotylum. The primer set targeting the ITS sequence of P. myriotylum worked most efficiently at 60°C and allowed the detection of P. myriotylum DNA within 30 min by fluorescence monitoring using a real-time PCR instrument. The peak denaturing temperature of amplified DNA was about 87·0°C. In specificity tests using eight Pythium myriotylum strains, 59 strains from 39 species of Pythium, 11 Phytophthora strains and eight other soil-borne pathogens, LAMP gave no cross-reactions. The detection limit was 100 fg of genomic DNA, which was as sensitive as PCR. LAMP could detect P. myriotylum in hydroponic solution samples, and the results coincided with those of the conventional plating method in almost all cases. The LAMP method established in this study is a simple and sensitive tool for the detection of P. myriotylum. SIGNIFICANCE AND IMPACT OF THE STUDY This study shows the first LAMP assay for the detection of Pythium myriotylum. The primer set designed from ITS region of P. myriotylum can detect the pathogen in field sample with a fast and convenient method. Analysis of the annealing curve of the LAMP reaction products increases the reliability of the LAMP diagnosis. This study shows that the diagnostic method using the LAMP assay is useful for monitoring P. myriotylum in the field.
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Shima Y, Kitaoka K, Nakase J, Goshima K, Takahashi R, Toratani T, Kosaka M, Ohashi Y, Tsuchiya H, Munehiro T, Aiba T. YOUNG FEMALE ATHLETES HAVE CHANGED CONSIDERABLY IN THE TWO YEARS AFTER BASELINE EVALUATION IN A PROSPECTIVE STUDY. Br J Sports Med 2014. [DOI: 10.1136/bjsports-2014-093494.269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Takahashi R, Amano H, Satoh T, Tabata K, Ikeda M, Kitasato H, Akira S, Iwamura M, Majima M. Roles of microsomal prostaglandin E synthase-1 in lung metastasis formation in prostate cancer RM9 cells. Biomed Pharmacother 2014; 68:71-7. [DOI: 10.1016/j.biopha.2013.10.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Accepted: 10/24/2013] [Indexed: 12/20/2022] Open
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Seyahi E, Cebi Olgun D, Ugurlu S, Hanci I, Takahashi R, Yazici H. FRI0493 A ct evaluation of pulmonary and cardiac lesions in behçet’s syndrome patients without pulmonary symptoms. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2013-eular.1620] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Miwa Y, Furuya H, Yanai R, Ohtsuka K, Sato M, Takahashi R, Wakabayashi K, Yajima N, Kasama T, Hosaka M. AB0448 Factors leading to HAQ remission after beginning biologics treatment in patients with rheumatoid arthritis. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2012-eular.448] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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