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Watanabe T, Seguchi O, Yanase M, Fujita T, Sato T, Sunami H, Nakajima S, Nishimura K, Hisamatsu E, Kuroda K, Okada N, Wada K, Hata H, Ishibashi-Ueda H, Miyamoto Y, Kobayashi J, Fukushima N, Nakatani T. Relationship Between Brachial Artery Flow-Mediated Dilation and Clinical Characteristics of Heart Transplant Recipients. J Heart Lung Transplant 2016. [DOI: 10.1016/j.healun.2016.01.578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Hata H, Fujita T, Ishibashi-Ueda H, Fukushima N, Nakatani T, Kobayashi J. Primary Graft Dysfunction after Heart Transplantation with High Frequency of Marginal Donor Hearts. J Heart Lung Transplant 2016. [DOI: 10.1016/j.healun.2016.01.849] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Sato T, Seguchi O, Kanaumi Y, Yanase M, Okada N, Kuroda K, Hisamatsu E, Sunami H, Nakajima S, Hata H, Fujita T, Ishibashi-Ueda H, Fukushima N, Kobayashi J, Nakatani T. Clinical Implication of Non-Complement-Binding De Novo Donor-Specific Anti-HLA Antibodies in Heart Transplant Recipients: Do We Really Have to Care All the DSA Positive Patients? J Heart Lung Transplant 2016. [DOI: 10.1016/j.healun.2016.01.585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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54
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Hisamatsu E, Seguchi O, Okada N, Kuroda K, Sunami H, Nakajima S, Sato T, Hata H, Yanase M, Fujita T, Fukushima N, Kobayashi J, Nakatani T. Gynecological Complications in Female Patients with Left Ventricular Assist Device Support. J Heart Lung Transplant 2016. [DOI: 10.1016/j.healun.2016.01.362] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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55
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Seguchi O, Saito K, Fukuma K, Nakajima S, Sunami H, Sato T, Yanase M, Hata H, Fujita T, Nagatsuka K, Kobayashi J, Fukushima N, Nakatani T. The Clinical Relevance of Transcranial Doppler Detection of Micro-Embolic Signals in Patients with Heartmate II. J Heart Lung Transplant 2016. [DOI: 10.1016/j.healun.2016.01.687] [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] Open
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Seguchi O, Nakano A, Nakajima S, Sunami H, Sato T, Yanase M, Hata H, Fujita T, Kobayashi J, Kitakaze M, Fukushima N, Nakatani T. Low Partial Pressure of End-Tidal Carbon Dioxide Predicts the Future Ventricular Assist Device Implantation in Patients with Chronic Advanced Heart Failure. J Heart Lung Transplant 2016. [DOI: 10.1016/j.healun.2016.01.480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Matsumoto Y, Fujita T, Hata H, Shimahara Y, Nakajima S, Sato T, Seguchi O, Yanase M, Fukushima N, Nakatani T, Kobayashi J. Driveline Angle Is Crucial to Prevent Exit Site Infection in Patients with HeartMate II. J Heart Lung Transplant 2016. [DOI: 10.1016/j.healun.2016.01.727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Kobayashi J, Yukimoto J, Shimizu Y, Ohmori T, Suzuki H, Doi K, Ohshima T. Characterization of Lactobacillus salivarius alanine racemase: short-chain carboxylate-activation and the role of A131. SPRINGERPLUS 2015; 4:639. [PMID: 26543773 PMCID: PMC4628008 DOI: 10.1186/s40064-015-1335-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 12/24/2014] [Indexed: 11/10/2022]
Abstract
Many strains of lactic acid bacteria produce high concentrations of d-amino acids. Among them, Lactobacillus salivarius UCC 118 produces d-alanine at a relative concentration much greater than 50 % of the total d, l-alanine (100d/d, l-alanine). We characterized the L. salivarius alanine racemase (ALR) likely responsible for this d-alanine production and found that the enzyme was activated by carboxylates, which is an unique characteristic among ALRs. In addition, alignment of the amino acid sequences of several ALRs revealed that A131 of L. salivarius ALR is likely involved in the activation. To confirm that finding, an L. salivarius ALR variant with an A131K (ALR(A131K)) substitution was prepared, and its properties were compared with those of ALR. The activity of ALR(A131K) was about three times greater than that of ALR. In addition, whereas L. salivarius ALR was strongly activated by low concentrations (e.g., 1 mM) of short chain carboxylates, and was inhibited at higher concentrations (e.g., 10 mM), ALR(A131K) was clearly inhibited at all carboxylate concentrations tested (1-40 mM). Acetate also increased the stability of ALR such that maximum activity was observed at 35 °C and pH 8.0 without acetate, but at 50 °C in the presence of 1 mM acetate. On the other hand, maximum ALR(A131K) activity was observed at 45 °C and around pH 9.0 with or without acetate. It thus appears that A131 mediates the activation and stabilization of L. salivarius ALR by short chain carboxylates.
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Patel J, Cordeiro D, Hewson S, Cohn R, Kannu P, Kobayashi J, Mahmutoglu S. Diagnostic yield of genetic testing in epileptic encephalopathy in childhood. J Neurol Sci 2015. [DOI: 10.1016/j.jns.2015.08.161] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Kobayashi J, Miyazaki A, Dehari H, Ogi K, Hiratsuka H. A clinical analysis of 18F-fluorodeoxyglucose-positron emission tomography/computed tomography (FDG-PET/CT) on patients with oral cancer. Int J Oral Maxillofac Surg 2015. [DOI: 10.1016/j.ijom.2015.08.194] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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61
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Wada K, Kobayashi J, Furukawa M, Doi K, Ohshiro T, Suzuki H. A thiostrepton resistance gene and its mutants serve as selectable markers in Geobacillus kaustophilus HTA426. Biosci Biotechnol Biochem 2015; 80:368-75. [PMID: 26333661 DOI: 10.1080/09168451.2015.1079478] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Effective utilization of microbes often requires complex genetic modification using multiple antibiotic resistance markers. Because a few markers have been used in Geobacillus spp., the present study was designed to identify a new marker for these thermophiles. We explored antibiotic resistance genes functional in Geobacillus kaustophilus HTA426 and identified a thiostrepton resistance gene (tsr) effective at 50 °C. The tsr gene was further used to generate the mutant tsr(H258Y) functional at 55 °C. Higher functional temperature of the mutant was attributable to the increase in thermostability of the gene product because recombinant protein produced from tsr(H258Y) was more thermostable than that from tsr. In fact, the tsr(H258Y) gene served as a selectable marker for plasmid transformation of G. kaustophilus. This new marker could facilitate complex genetic modification of G. kaustophilus and potentially other Geobacillus spp.
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Yoshikawa Y, Yamasaki A, Takatori K, Suzuki M, Kobayashi J, Takao M, Zhang-Akiyama QM. Excess processing of oxidative damaged bases causes hypersensitivity to oxidative stress and low dose rate irradiation. Free Radic Res 2015; 49:1239-48. [DOI: 10.3109/10715762.2015.1061186] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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63
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Matsumoto Y, Fujita T, Hata H, Shimahara Y, Sato S, Seguchi O, Nakatani T, Kobayashi J. Hemodynamic Performance and Early Clinical Result, EVAHEART and HeartMate II. J Heart Lung Transplant 2015. [DOI: 10.1016/j.healun.2015.01.627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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64
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Nakajima S, Seguchi O, Kuroda K, Hisamatsu E, Sato T, Sunami H, Sato T, Yanase M, Hata H, Fujita T, Kobayashi J, Nakatani T. Low Prevalence of Acquired von Willebrand Syndrome in Japanese Recipients of Continuous-Flow Ventricular Assist Devices. J Heart Lung Transplant 2015. [DOI: 10.1016/j.healun.2015.01.171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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65
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Kobayashi J, Furukawa M, Ohshiro T, Suzuki H. Thermoadaptation-directed evolution of chloramphenicol acetyltransferase in an error-prone thermophile using improved procedures. Appl Microbiol Biotechnol 2015; 99:5563-72. [PMID: 25783628 DOI: 10.1007/s00253-015-6522-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Revised: 02/26/2015] [Accepted: 03/04/2015] [Indexed: 10/23/2022]
Abstract
Enhancing the thermostability of thermolabile enzymes extends their practical utility. We previously demonstrated that an error-prone thermophile derived from Geobacillus kaustophilus HTA426 can generate mutant genes encoding enzyme variants that are more thermostable than the parent enzyme. Here, we used this approach, termed as thermoadaptation-directed enzyme evolution, to increase the thermostability of the chloramphenicol acetyltransferase (CAT) of Staphylococcus aureus and successfully generated a CAT variant with an A138T replacement (CAT(A138T)). This variant was heterologously produced, and its enzymatic properties were compared with those of the wild type. We found that CAT(A138T) had substantially higher thermostability than CAT but had comparable activities, showing that the A138T replacement enhanced protein thermostability without affecting the catalytic activity. Because variants CAT(A138S) and CAT(A138V), which were generated via in vitro site-directed mutagenesis, were more thermostable than CAT, the thermostability enhancement resulting from the A138T replacement can be attributed to both the presence of a hydroxyl group and the bulk of the threonine side chain. CAT(A138T) conferred chloramphenicol resistance to G. kaustophilus cells at high temperature more efficiently than CAT. Therefore, the gene encoding CAT(A138T) may be useful as a genetic marker in Geobacillus spp. Notably, CAT(A138T) generation was achieved only by implementing improved procedures (plasmid-based mutations on solid media); previous procedures (chromosome-based mutations in liquid media) were unsuccessful. This result suggests that this improved procedure is crucial for successful thermoadaptation-directed evolution in certain cases and increases the opportunities for generating thermostable enzymes.
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Shimura T, Kobayashi J, Komatsu K, Kunugita N. DNA damage signaling guards against perturbation of cyclin D1 expression triggered by low-dose long-term fractionated radiation. Oncogenesis 2014; 3:e132. [PMID: 25486524 PMCID: PMC4275562 DOI: 10.1038/oncsis.2014.48] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 09/24/2014] [Accepted: 11/02/2014] [Indexed: 12/20/2022] Open
Abstract
Cyclin D1 expression is precisely controlled during cell-cycle progression. However, repeated exposure to low-dose fractionated radiation (FR) abrogates cell cycle-dependent cyclin D1 degradation by constitutive activation of AKT survival signaling in normal human fibroblasts. The resulting abnormal nuclear cyclin D1 accumulation induces defects in DNA replication and resulting DNA double-strand breaks, and is associated with induction of genomic instability in low-dose irradiated cells. Here, we investigated the role of DNA damage signaling against such perturbed cell-cycle control of cyclin D1 expression. Nuclear cyclin D1 accumulation was induced within 7 days after low-dose FR (0.01 Gy or 0.05 Gy per fraction) in ATM-deficient cells (AT5BIVA), but appeared later in AT5BIVA cells harboring human ATM cDNA. Thus, ATM prevents abnormal nuclear cyclin D1 accumulation at early time points after low-dose FR. We further demonstrated that ATM-mediated downregulation of protein phosphatase 2A activity caused activation of the AKT/cyclin D1 pathway after long-term FR. Perturbation of cyclin D1 expression induced Rad51 foci that indicate homologous recombination repair (HRR) in control cells, while ATM- and NBS1-deficient cells (GM7166) failed to induce Rad51 foci after long-term low-dose FR. After 21 days of FR, NBS1- and ATM-deficient cells showed a decrease in nuclear cyclin D1-positive cells, and an increase in apoptotic cells. Similarly, inhibition of ATM with KU55933 abrogated nuclear cyclin D1 accumulation by induction of apoptosis in ATM-complemented cells exposed to low-dose FR. In conclusion, we here demonstrate that ATM is involved in controlling cyclin D1 levels after low-dose FR. DNA damage signaling mitigates the harmful effects of low-dose long-term FR by suppression of cell death induced by perturbation of cyclin D1 expression.
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Kawamoto N, Fujita T, Hata H, Shimahara Y, Sato S, Kobayashi J. 049 * PROSTHESIS-PATIENT MISMATCH DUE TO SMALL RING ANNULOPLASTY IN PATIENTS WITH DEGENERATIVE MITRAL INSUFFICIENCY. Interact Cardiovasc Thorac Surg 2014. [DOI: 10.1093/icvts/ivu276.49] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Hata H, Fujita T, Shimahara Y, Ueda-Ishibashi H, Sato S, Kobayashi J. 091 * TWENTY-FIVE-YEAR EXPERIENCE OF CHORDAL REPLACEMENT WITH EXPANDED POLYTETRAFLUOROETHYLENE IN MITRAL VALVE REPAIR. Interact Cardiovasc Thorac Surg 2014. [DOI: 10.1093/icvts/ivu276.91] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Oda T, Minatoya K, Kobayashi J, Okita Y, Tanaka H, Kawaharada N, Saiki Y, Kuniyoshi Y. 322 * PROSTHETIC VASCULAR GRAFT INFECTION COMPLICATED BY MEDIASTINITIS: A MULTICENTRE REVIEW. Interact Cardiovasc Thorac Surg 2014. [DOI: 10.1093/icvts/ivu276.322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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70
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Tanaka H, Minatoya K, Sasaki H, Oda T, Itonaga T, Kobayashi J. 210 * CONTEMPORARY APPROACH OF THORACO-ABDOMINAL AORTIC REPAIR USING MODERATE TO DEEP HYPOTHERMIA COMBINED WITH TARGET RECONSTRUCTION OF THE ADAMKIEWICZ ARTERY. Interact Cardiovasc Thorac Surg 2014. [DOI: 10.1093/icvts/ivu276.210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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71
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Hasegawa H, Watanabe H, Tsukamoto K, Kikumoto A, Ishibashi K, Sasano R, Saito S, Kobayashi J. Influence of blastocyst size at freezing and timing of freezing on pregnancy rates. Fertil Steril 2014. [DOI: 10.1016/j.fertnstert.2014.07.570] [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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Nohara A, Kobayashi J, Kawashiri M, Tada H, Inazu A, Jiang M, Mabuchi H, Bujo H. Clinical significance of measuring soluble LR11, a circulating marker of atherosclerosis and HbA1c in familial hypercholesterolemia. Clin Biochem 2014; 47:1326-8. [DOI: 10.1016/j.clinbiochem.2014.05.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Revised: 04/30/2014] [Accepted: 05/03/2014] [Indexed: 10/25/2022]
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Hieda M, Sata M, Seguchi O, Yanase M, Murata Y, Sato T, Sunami H, Nakajima S, Watanabe T, Hori Y, Wada K, Hata H, Fujita T, Kobayashi J, Nakatani T. Importance of Early Appropriate Intervention Including Antibiotics and Wound Care for Device-Related Infection in Patients With Left Ventricular Assist Device. Transplant Proc 2014; 46:907-10. [DOI: 10.1016/j.transproceed.2013.11.106] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Accepted: 11/15/2013] [Indexed: 11/16/2022]
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Iba Y, Minatoya K, Matsuda H, Sasaki H, Tanaka H, Oda T, Kobayashi J. How should aortic arch aneurysms be treated in the endovascular aortic repair era? A risk-adjusted comparison between open and hybrid arch repair using propensity score-matching analysis. Eur J Cardiothorac Surg 2014; 46:32-9. [DOI: 10.1093/ejcts/ezt615] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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75
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Sakamoto Y, Koga M, Kimura K, Nagatsuka K, Okuda S, Kario K, Hasegawa Y, Okada Y, Yamagami H, Furui E, Nakagawara J, Shiokawa Y, Okata T, Kobayashi J, Tanaka E, Minematsu K, Toyoda K. Intravenous thrombolysis for patients with reverse magnetic resonance angiography and diffusion-weighted imaging mismatch: SAMURAI and NCVC rt-PA Registries. Eur J Neurol 2013; 21:419-26. [PMID: 24261412 DOI: 10.1111/ene.12308] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Accepted: 10/21/2013] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND PURPOSE The characteristics of reverse magnetic resonance angiography and diffusion-weighted imaging (MRA-DWI) mismatch (RMM), defined as a large DWI lesion in the absence of major artery occlusion (MAO), remain unknown, especially in patients treated with intravenous recombinant tissue plasminogen activator (rt-PA). METHODS Patients with stroke in the middle cerebral artery territory were included. Early ischaemic changes (EIC) were assessed with the Alberta Stroke Program Early CT Score on DWI (DWI-ASPECTS). All patients were divided into four groups based on the presence of MAO and a DWI-ASPECTS cut-off value of <7. RMM was defined as DWI-ASPECTS <7 without MAO. Clinical characteristics, symptomatic intracerebral hemorrhage (sICH) and favorable functional outcome (modified Rankin Scale score 0-2) at 90 days were compared amongst the four groups. RESULTS Of the 486 patients enrolled (167 women, median age 74 years, median initial National Institutes of Health Stroke Scale score 13), reverse MRA-DWI mismatch was observed in 24 (5%). Of the clinical characteristics, cardioembolism was the only factor that was independently associated with RMM [odds ratio (OR) 5.49, 95% confidence interval (CI) 1.25-24.1]. Multivariable analyses revealed that patients with RMM more commonly had sICH than those with DWI-ASPECTS ≥ 7 irrespective of the presence (OR 5.44, 95% CI 1.13-26.1) or absence (13.1, 2.07-83.3) of MAO, and they had a more favorable functional outcome than those with DWI-ASPECTS < 7 plus MAO (7.45, 2.39-23.2). CONCLUSION RMM was observed in 5% of patients treated with rt-PA and associated with cardioembolism. Patients with RMM may benefit from thrombolysis compared with those with EIC with MAO, although increment in the rate of sICH is a concern.
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