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Kojima A, Fukushima Y, Matsuura H. Prediction of anesthetic torsadogenicity using a human ventricular cell model. J Anesth 2023; 37:806-810. [PMID: 37524993 DOI: 10.1007/s00540-023-03238-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 07/25/2023] [Indexed: 08/02/2023]
Abstract
This simulation study was designed to predict the torsadogenicity of sevoflurane and propofol in healthy control, as well as type 1 and type 2 long QT syndrome (LQT1 and LQT2, respectively), using the O'Hara-Rudy dynamic model. LQT1 and LQT2 models were simulated by decreasing the conductances of slowly and rapidly activating delayed rectifier K+ currents (IKs and IKr, respectively) by 50%, respectively. Action potential duration at 50% repolarization level (APD50) and diastolic intracellular Ca2+ concentration were measured in epicardial cell during administration of sevoflurane (1 ~ 5%) and propofol (1 ~ 10 μM). Torsadogenicity can be predicted from the relationship between APD50 and diastolic intracellular Ca2+ concentration, which is classified by the decision boundary. Whereas the relationships in control and LQT1 models were distributed on nontorsadogenic side in the presence of sevoflurane at all tested concentrations, those in LQT2 models were shifted to torsadogenic side by concentrations of ≥ 2%. In all three models, propofol shifted the relationships in a direction away from the decision boundary on nontorsadogenic side. Our findings suggest that sevoflurane, but not propofol, exerts torsadogenicity in patients with reduced IKr, such as LQT2 patients. Caution should be paid to the occurrence of arrhythmia during sevoflurane anesthesia in patients with reduced IKr.
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Affiliation(s)
- Akiko Kojima
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan.
| | - Yutaka Fukushima
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan
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Marcuzzi D, Toigo V, Boldrin M, Chitarin G, Dal Bello S, Grando L, Luchetta A, Pasqualotto R, Pavei M, Serianni G, Zanotto L, Agnello R, Agostinetti P, Agostini M, Aprile D, Barbisan M, Battistella M, Berton G, Bigi M, Brombin M, Candela V, Candeloro V, Canton A, Casagrande R, Cavallini C, Cavazzana R, Cordaro L, Cruz N, Dalla Palma M, Dan M, De Lorenzi A, Delogu R, De Muri M, De Nardi M, Denizeau S, Fadone M, Fellin F, Ferro A, Gaio E, Gasparrini C, Gnesotto F, Jain P, La Rosa A, Lopez-Bruna D, Lorenzini R, Maistrello A, Manduchi G, Manfrin S, Marconato N, Mario I, Martini G, Milazzo R, Patton T, Peruzzo S, Pilan N, Pimazzoni A, Poggi C, Pomaro N, Pouradier-Duteil B, Recchia M, Rigoni-Garola A, Rizzetto D, Rizzolo A, Santoro F, Sartori E, Segalini B, Shepherd A, Siragusa M, Sonato P, Sottocornola A, Spada E, Spagnolo S, Spolaore M, Taliercio C, Tinti P, Tomsič P, Trevisan L, Ugoletti M, Valente M, Valisa M, Veronese F, Vignando M, Zaccaria P, Zagorski R, Zaniol B, Zaupa M, Zuin M, Cavenago M, Boilson D, Rotti C, Decamps H, Geli F, Sharma A, Veltri P, Zacks J, Simon M, Paolucci F, Garbuglia A, Gutierrez D, Masiello A, Mico G, Labate C, Readman P, Bragulat E, Bailly-Maitre L, Gomez G, Kouzmenko G, Albajar F, Kashiwagi M, Tobari H, Kojima A, Murayama M, Hatakeyama S, Oshita E, Maejima T, Shibata N, Yamashita Y, Watanabe K, Singh N, Singh M, Dhola H, Fantz U, Heinemann B, Wimmer C, Wünderlich D, Tsumori K, Croci G, Gorini G, Muraro A, Rebai M, Tardocchi M, Giacomelli L, Rigamonti D, Taccogna F, Bruno D, Rutigliano M, Longo S, Deambrosis S, Miorin E, Montagner F, Tonti A, Panin F. Lessons learned after three years of SPIDER operation and the first MITICA integrated tests. Fusion Engineering and Design 2023. [DOI: 10.1016/j.fusengdes.2023.113590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/27/2023]
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Miyazaki N, Kojima A, Fukushima Y, Kitagawa H. Severe Calcification of Femoral Arteries Causes Tourniquet Failure Accompanied by Massive Bleeding. J Am Podiatr Med Assoc 2023; 113:21-059. [PMID: 36905612 DOI: 10.7547/21-059] [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: 03/12/2023]
Abstract
Tourniquet failure is attributed to inadequate tourniquet pressure, inadequate exsanguination, failure to compress medullary vessels within the bone, and incompressible calcified arteries. We herein report a case of massive bleeding using a properly functioning tourniquet in a patient who had bilateral calcified femoral arteries. When incompressible calcified arteries are present, the inflated tourniquet cuff fails to adequately compress the underlying artery, yet acts as an efficient venous tourniquet, which leads to an increase in bleeding. It is therefore critical to preoperatively confirm the effectiveness of the tourniquet in arterial occlusion in patients with severe arterial calcification.
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Affiliation(s)
- Narumi Miyazaki
- *Department of Anesthesiology, Shiga University of Medical Science, Shiga, Japan
| | - Akiko Kojima
- *Department of Anesthesiology, Shiga University of Medical Science, Shiga, Japan
| | - Yutaka Fukushima
- *Department of Anesthesiology, Shiga University of Medical Science, Shiga, Japan
| | - Hirotoshi Kitagawa
- *Department of Anesthesiology, Shiga University of Medical Science, Shiga, Japan
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Kojima A, Kamiya K, Kajita E, Tachiki T, Sato Y, Kouda K, Uenishi K, Tamaki J, Kagamimori S, Iki M. Association between Dairy Product intake and Risk of Osteoporotic Fractures in Postmenopausal Japanese Women: Secondary Analysis of 15-Year Follow-Up data from the Japanese Population-Based Osteoporosis (JPOS) Cohort Study. J Nutr Health Aging 2023; 27:228-237. [PMID: 36973932 DOI: 10.1007/s12603-023-1898-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/28/2023]
Abstract
OBJECTIVES Few prospective cohort studies have evaluated the relationship between dairy product intake frequency and risk of osteoporotic fractures in Asians. This study aimed to investigate the association between habitual dairy product intake and risk of osteoporotic fractures. DESIGN Secondary analysis of prospective cohort study. SETTING Five municipalities of Japan. PARTICIPANTS This study included 1,429 postmenopausal Japanese women (age ≥45 years at baseline). MEASUREMENTS Baseline milk-intake frequency was obtained using nurse-administered questionnaires. Intakes of yogurt and cheese, and estimated calcium intake, were assessed using a validated food frequency questionnaire. Osteoporotic fracture was defined as a clinical fracture diagnosed using radiography. Hazard ratios (HRs) with 95% confidence intervals (CIs) were estimated using Cox proportional hazards models. RESULTS Over a median follow-up period of 15.1 years (interquartile range [IQR], 10.1-15.4 years; total, 18,118 person-years), 172 women sustained at least one osteoporotic fracture. The proportions of participants with milk intakes <1, 1, and ≥2 cups/d were 34.4%, 48.0%, and 17.6%, respectively. After adjustment for age, frequency of yogurt intake, frequency of cheese intake, body mass index, history of osteoporotic fractures, and frequency of natto intake, the HRs compared with that for milk intake <1 cup/d were 0.71 (95% CI: 0.51-0.98) and 0.57 (95% CI: 0.35-0.92) for 1 cup/d and ≥2 cups/d, respectively. After adjustment for bone mineral density, HR significance for milk intakes ≥2 cups/d remained significant. Yogurt and cheese intakes were not related to the risk of osteoporotic fractures. CONCLUSION High habitual milk intake, but not a habitual yogurt or cheese intake is associated with a decreased risk of osteoporotic fractures, independent of bone mineral density, in postmenopausal Japanese women.
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Affiliation(s)
- A Kojima
- Junko Tamaki, Department of Hygiene and Public Health, Faculty of Medicine, Osaka Medical and Pharmaceutical University, 2-7 Daigaku-Machi, Takatsuki, Osaka 569-8686, Japan, Telephone: +81-72-683-1221, E-mail:
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Kashiwagi M, Kisaki M, Saquilayan GQ, Kojima A, Hiratsuka J, Ichikawa M, Shimabukuro Y, Murayama M, Tobari H. Study of beamlets extracted from a multi-aperture and five-stage acceleration system. Rev Sci Instrum 2022; 93:053301. [PMID: 35649793 DOI: 10.1063/5.0080804] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 03/12/2022] [Indexed: 06/15/2023]
Abstract
A beam optics study using the ITER-relevant high intense negative ion beams, such as 1 MeV, 200 A/m2, has been performed experimentally and analytically using a multi-aperture and five-stage accelerator. Initially, multi-beamlets generated from this accelerator were deflected in various directions due to the magnetic field and space charge repulsion between beams and showed various divergences. These had limited the pulse length and the beam energy. Compensation methods of the beamlet deflections have worked effectively and contributed to achieving the ITER requirement, the divergence angle of <7 mrad, and the deflection angle of <1 mrad for 1 MeV beam. The beam pulse has been gradually extended from 1 to 100 s and is now going to a longer pulse based on these results. One of the remaining issues is to understand and suppress peripheral components of the beam, namely, the halo, and to reduce the local heat loads observed around the aperture edge. This halo component has been successfully distinguished from the beam core by using a newly developed beam emittance measurement system for high intense beams. By combining this measured beam emittance and the beam simulation, it was clarified for the first time that the halo components are generated in an area of 1 mm width from the aperture edge.
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Affiliation(s)
- M Kashiwagi
- Fusion Energy Directorate, National Institutes for Quantum Science and Technology, Naka, Ibaraki 311-0193, Japan
| | - M Kisaki
- Fusion Energy Directorate, National Institutes for Quantum Science and Technology, Naka, Ibaraki 311-0193, Japan
| | - G Q Saquilayan
- Fusion Energy Directorate, National Institutes for Quantum Science and Technology, Naka, Ibaraki 311-0193, Japan
| | - A Kojima
- Fusion Energy Directorate, National Institutes for Quantum Science and Technology, Naka, Ibaraki 311-0193, Japan
| | - J Hiratsuka
- Fusion Energy Directorate, National Institutes for Quantum Science and Technology, Naka, Ibaraki 311-0193, Japan
| | - M Ichikawa
- Fusion Energy Directorate, National Institutes for Quantum Science and Technology, Naka, Ibaraki 311-0193, Japan
| | - Y Shimabukuro
- Fusion Energy Directorate, National Institutes for Quantum Science and Technology, Naka, Ibaraki 311-0193, Japan
| | - M Murayama
- Fusion Energy Directorate, National Institutes for Quantum Science and Technology, Naka, Ibaraki 311-0193, Japan
| | - H Tobari
- Fusion Energy Directorate, National Institutes for Quantum Science and Technology, Naka, Ibaraki 311-0193, Japan
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Shimizu M, Mi X, Toyoda F, Kojima A, Ding WG, Fukushima Y, Omatsu-Kanbe M, Kitagawa H, Matsuura H. Propofol, an Anesthetic Agent, Inhibits HCN Channels through the Allosteric Modulation of the cAMP-Dependent Gating Mechanism. Biomolecules 2022; 12:biom12040570. [PMID: 35454159 PMCID: PMC9032835 DOI: 10.3390/biom12040570] [Citation(s) in RCA: 1] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 04/08/2022] [Accepted: 04/10/2022] [Indexed: 11/16/2022] Open
Abstract
Propofol is a broadly used intravenous anesthetic agent that can cause cardiovascular effects, including bradycardia and asystole. A possible mechanism for these effects is slowing cardiac pacemaker activity due to inhibition of the hyperpolarization-activated, cyclic nucleotide-gated (HCN) channels. However, it remains unclear how propofol affects the allosteric nature of the voltage- and cAMP-dependent gating mechanism in HCN channels. To address this aim, we investigated the effect of propofol on HCN channels (HCN4 and HCN2) in heterologous expression systems using a whole-cell patch clamp technique. The extracellular application of propofol substantially suppressed the maximum current at clinical concentrations. This was accompanied by a hyperpolarizing shift in the voltage dependence of channel opening. These effects were significantly attenuated by intracellular loading of cAMP, even after considering the current modification by cAMP in opposite directions. The differential degree of propofol effects in the presence and absence of cAMP was rationalized by an allosteric gating model for HCN channels, where we assumed that propofol affects allosteric couplings between the pore, voltage-sensor, and cyclic nucleotide-binding domain (CNBD). The model predicted that propofol enhanced autoinhibition of pore opening by unliganded CNBD, which was relieved by the activation of CNBD by cAMP. Taken together, these findings reveal that propofol acts as an allosteric modulator of cAMP-dependent gating in HCN channels, which may help us to better understand the clinical action of this anesthetic drug.
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Affiliation(s)
- Morihiro Shimizu
- Department of Anesthesiology, Shiga University of Medical Science, Otsu 520-2192, Japan; (M.S.); (A.K.); (Y.F.); (H.K.)
| | - Xinya Mi
- Department of Physiology, Shiga University of Medical Science, Otsu 520-2192, Japan; (X.M.); (F.T.); (M.O.-K.); (H.M.)
| | - Futoshi Toyoda
- Department of Physiology, Shiga University of Medical Science, Otsu 520-2192, Japan; (X.M.); (F.T.); (M.O.-K.); (H.M.)
| | - Akiko Kojima
- Department of Anesthesiology, Shiga University of Medical Science, Otsu 520-2192, Japan; (M.S.); (A.K.); (Y.F.); (H.K.)
| | - Wei-Guang Ding
- Department of Physiology, Shiga University of Medical Science, Otsu 520-2192, Japan; (X.M.); (F.T.); (M.O.-K.); (H.M.)
- Correspondence: ; Tel.: +81-77-548-2152; Fax: +81-77-548-2348
| | - Yutaka Fukushima
- Department of Anesthesiology, Shiga University of Medical Science, Otsu 520-2192, Japan; (M.S.); (A.K.); (Y.F.); (H.K.)
| | - Mariko Omatsu-Kanbe
- Department of Physiology, Shiga University of Medical Science, Otsu 520-2192, Japan; (X.M.); (F.T.); (M.O.-K.); (H.M.)
| | - Hirotoshi Kitagawa
- Department of Anesthesiology, Shiga University of Medical Science, Otsu 520-2192, Japan; (M.S.); (A.K.); (Y.F.); (H.K.)
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu 520-2192, Japan; (X.M.); (F.T.); (M.O.-K.); (H.M.)
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Ishihara M, Kojima A, Ding WG, Kitagawa H, Matsuura H. Dexmedetomidine Exerts a Negative Chronotropic Action on Sinoatrial Node Cells Through the Activation of Imidazoline Receptors. J Cardiovasc Pharmacol 2021; 78:826-838. [PMID: 34448469 DOI: 10.1097/fjc.0000000000001133] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 08/05/2021] [Indexed: 11/25/2022]
Abstract
ABSTRACT Dexmedetomidine (DEX), an α2-adrenoreceptor (α2-AR) and imidazoline receptor agonist, is most often used for the sedation of patients in the intensive care unit. Its administration is associated with an increased incidence of bradycardia; however, the precise mechanism of DEX-induced bradycardia has yet to be fully elucidated. This study was undertaken to examine whether DEX modifies pacemaker activity and the underlying ionic channel function through α2-AR and imidazoline receptors. The whole-cell patch-clamp techniques were used to record action potentials and related ionic currents of sinoatrial node cells in guinea pigs. DEX (≥10 nM) reduced sinoatrial node automaticity and the diastolic depolarization rate. DEX reduced the amplitude of hyperpolarization-activated cation current (If or Ih) the pacemaker current, even within the physiological pacemaker potential range. DEX slowed the If current activation kinetics and caused a significant shift in the voltage dependence of channel activation to negative potentials. In addition, efaroxan, an α2-AR and imidazoline I1 receptor antagonist, attenuated the inhibitory effects of DEX on sinoatrial node automaticity and If current activity, whereas yohimbine, an α2-AR-selective antagonist, did not. DEX did not affect the current activities of other channels, including rapidly and slowly activating delayed rectifier K+ currents (IKr and IKs), L-type Ca2+ current (ICa,L), Na+/Ca2+ exchange current (INCX), and muscarinic K+ current (IK,ACh). Our results indicate that DEX, at clinically relevant concentrations, induced a negative chronotropic effect on the sinoatrial node function through the downregulation of If current through an imidazoline I1 receptor other than the α2-AR in the clinical setting.
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Affiliation(s)
- Mariko Ishihara
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan; and
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Akiko Kojima
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Wei-Guang Ding
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan; and
| | - Hirotoshi Kitagawa
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan; and
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Yuasa M, Kojima A, Mi X, Ding WG, Omatsu-Kanbe M, Kitagawa H, Matsuura H. Characterization and functional role of rapid- and slow-activating delayed rectifier K + currents in atrioventricular node cells of guinea pigs. Pflugers Arch 2021; 473:1885-1898. [PMID: 34704178 DOI: 10.1007/s00424-021-02617-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 08/05/2021] [Accepted: 08/19/2021] [Indexed: 01/28/2023]
Abstract
The atrioventricular (AV) node is the only conduction pathway where electrical impulse can pass from atria to ventricles and exhibits spontaneous automaticity. This study examined the function of the rapid- and slow-activating delayed rectifier K+ currents (IKr and IKs) in the regulation of AV node automaticity. Isolated AV node cells from guinea pigs were current- and voltage-clamped to record the action potentials and the IKr and IKs current. The expression of IKr or IKs was confirmed in the AV node cells by immunocytochemistry, and the positive signals of both channels were localized mainly on the cell membrane. The basal spontaneous automaticity was equally reduced by E4031 and HMR-1556, selective blockers of IKr and IKs, respectively. The nonselective β-adrenoceptor agonist isoproterenol markedly increased the firing rate of action potentials. In the presence of isoproterenol, the firing rate of action potentials was more effectively reduced by the IKs inhibitor HMR-1556 than by the IKr inhibitor E4031. Both E4031 and HMR-1556 prolonged the action potential duration and depolarized the maximum diastolic potential under basal and β-adrenoceptor-stimulated conditions. IKr was not significantly influenced by β-adrenoceptor stimulation, but IKs was concentration-dependently enhanced by isoproterenol (EC50: 15 nM), with a significant negative voltage shift in the channel activation. These findings suggest that both the IKr and IKs channels might exert similar effects on regulating the repolarization process of AV node action potentials under basal conditions; however, when the β-adrenoceptor is activated, IKs modulation may become more important.
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Affiliation(s)
- Mayumi Yuasa
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan
| | - Akiko Kojima
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan
| | - Xinya Mi
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan
| | - Wei-Guang Ding
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan.
| | - Mariko Omatsu-Kanbe
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan
| | - Hirotoshi Kitagawa
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan
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Numata R, Takigiku K, Takei K, Akazawa Y, Yonehara K, Obinata H, Konuma T, Kojima A. The impact of intraoperative pericardial three-dimensional echocardiography for the atrioventricular valve repair in the patient with congenital heart disease. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.1613] [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: 11/12/2022] Open
Abstract
Abstract
Background
Atrioventricular valve (AVV) regurgitation enormously affected the survival outcome of the patients with congenital heart disease (CHD). However, the image quality by use of transthoracic echocardiography has not reached a level that is sufficient, and also, three-dimensional echocardiography, which is useful to clarify complex AVV anatomy, cannot be applied for the patients less than 15kg, to guide for the AVV repair in pediatric patients. We try to show surgeons more precise three-dimensional images about an AVV by using intraoperative pericardial three-dimensional echocardiography (IP3DE) and improve the surgical outcome.
Purpose
To determine the efficacy of IP3DE by assessing the surgical outcome of an AVV repair and re-intervention rate.
Method
Eighty-five patient with CHD who underwent atrioventricular repair with significant regurgitation (Grade 2–4+) before operation were divided into two groups imaged IP3DE or not, in our hospital from 1993 to 2020. We assessed the surgical outcome and re-intervention rate between two arms and re-evaluate AVV images before surgery compared to the IP3DE.
Result
IP3DE was performed in forty-six patients (IP3DE group) and thirty-nine patients were not (control group). Median age at AVV repair was 3.0/2.8 years, respectively. The AVV was tricuspid (n=25), mitral (n=41), or common (n=19). The IP3DE group had a significantly higher improvement in regurgitation of AVV (IP3DE: Grade 3.2±0.3 → 1.7±0.3 vs Control: Grade 2.8±0.3 → 1.8±0.3, p<0.05). Fifty-nine percent of the IP3DE group was successful outcome (Grade<1+ after repair). There was no significant difference in the rate of re-intervention after surgery between two groups. In multivariate analysis, using IP3DE contributed to successful outcome for AVV repair (OR: 4.66, 95% CI: 1.46–14.8, p<0.01). The different and/or additional anatomical AVV findings were obtained in sixty-one percent of patients by the IP3DE.
Conclusion
IP3DE contributes to successful outcome for AVV repair by obtaining further information on complicated AVV anatomy in congenital heart disease. IP3DE also enables both cardiovascular surgeons and cardiologists to share the accurate and detail “surgeon's view” in the operating room for planning of AVV repair.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- R Numata
- Nagano Children's Hospital, Pediatric Cardiology, Azumino, Japan
| | - K Takigiku
- Nagano Children's Hospital, Pediatric Cardiology, Azumino, Japan
| | - K Takei
- Nagano Children's Hospital, Pediatric Cardiology, Azumino, Japan
| | - Y Akazawa
- Nagano Children's Hospital, Pediatric Cardiology, Azumino, Japan
| | - K Yonehara
- Nagano Children's Hospital, Pediatric Cardiology, Azumino, Japan
| | - H Obinata
- Nagano Children's Hospital, Pediatric Cardiology, Azumino, Japan
| | - T Konuma
- Nagano Children's Hospital, Cardiovascular Surgery, Azumino, Japan
| | - A Kojima
- Nagano Children's Hospital, Cardiovascular Surgery, Azumino, Japan
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Mi X, Ding WG, Toyoda F, Kojima A, Omatsu-Kanbe M, Matsuura H. Selective activation of adrenoceptors potentiates I Ks current in pulmonary vein cardiomyocytes through the protein kinase A and C signaling pathways. J Mol Cell Cardiol 2021; 161:86-97. [PMID: 34375616 DOI: 10.1016/j.yjmcc.2021.08.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 07/19/2021] [Accepted: 08/04/2021] [Indexed: 10/20/2022]
Abstract
Delayed rectifier K+ current (IKs) is a key contributor to repolarization of action potentials. This study investigated the mechanisms underlying the adrenoceptor-induced potentiation of IKs in pulmonary vein cardiomyocytes (PVC). PVC were isolated from guinea pig pulmonary vein. The action potentials and IKs current were recorded using perforated and conventional whole-cell patch-clamp techniques. The expression of IKs was examined using immunocytochemistry and Western blotting. KCNQ1, a IKs pore-forming protein was detected as a signal band approximately 100 kDa in size, and its immunofluorescence signal was found to be mainly localized on the cell membrane. The IKs current in PVC was markedly enhanced by both β1- and β2-adrenoceptor stimulation with a negative voltage shift in the current activation, although the potentiation was more effectively induced by β2-adrenoceptor stimulation than β1-adrenoceptor stimulation. Both β-adrenoceptor-mediated increases in IKs were attenuated by treatment with the adenylyl cyclase (AC) inhibitor or protein kinase A (PKA) inhibitor. Furthermore, the IKs current was increased by α1-adrenoceptor agonist but attenuated by the protein kinase C (PKC) inhibitor. PVC exhibited action potentials in normal Tyrode solution which was slightly reduced by HMR-1556 a selective IKs blocker. However, HMR-1556 markedly reduced the β-adrenoceptor-potentiated firing rate. The stimulatory effects of β- and α1-adrenoceptor on IKs in PVC are mediated via the PKA and PKC signal pathways. HMR-1556 effectively reduced the firing rate under β-adrenoceptor activation, suggesting that the functional role of IKs might increase during sympathetic excitation under in vivo conditions.
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Affiliation(s)
- Xinya Mi
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Wei-Guang Ding
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan.
| | - Futoshi Toyoda
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Akiko Kojima
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Mariko Omatsu-Kanbe
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
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Toigo V, Marcuzzi D, Serianni G, Boldrin M, Chitarin G, Bello SD, Grando L, Luchetta A, Pasqualotto R, Zaccaria P, Zanotto L, Agnello R, Agostinetti P, Agostini M, Antoni V, Aprile D, Barbisan M, Battistella M, Berton G, Bigi M, Brombin M, Candeloro V, Canton A, Casagrande R, Cavallini C, Cavazzana R, Cordaro L, Cruz N, Palma MD, Dan M, De Lorenzi A, Delogu R, De Muri M, Denizeau S, Fadone M, Fellin F, Ferro A, Gaio E, Gasparini F, Gasparrini C, Gnesotto F, Jain P, Krastev P, Lopez-Bruna D, Lorenzini R, Maistrello A, Manduchi G, Manfrin S, Marconato N, Martines E, Martini G, Martini S, Milazzo R, Patton T, Pavei M, Peruzzo S, Pilan N, Pimazzoni A, Poggi C, Pomaro N, Pouradier-Duteil B, Recchia M, Rigoni-Garola A, Rizzolo A, Sartori E, Shepherd A, Siragusa M, Sonato P, Sottocornola A, Spada E, Spagnolo S, Spolaore M, Taliercio C, Terranova D, Tinti P, Tomsič P, Trevisan L, Ugoletti M, Valente M, Vignando M, Zagorski R, Zamengo A, Zaniol B, Zaupa M, Zuin M, Cavenago M, Boilson D, Rotti C, Veltri P, Decamps H, Dremel M, Graceffa J, Geli F, Urbani M, Zacks J, Bonicelli T, Paolucci F, Garbuglia A, Agarici G, Gomez G, Gutierrez D, Kouzmenko G, Labate C, Masiello A, Mico G, Moreno JF, Pilard V, Rousseau A, Simon M, Kashiwagi M, Tobari H, Watanabe K, Maejima T, Kojima A, Oshita E, Yamashita Y, Konno S, Singh M, Chakraborty A, Patel H, Singh N, Fantz U, Bonomo F, Cristofaro S, Heinemann B, Kraus W, Wimmer C, Wünderlich D, Fubiani G, Tsumori K, Croci G, Gorini G, McCormack O, Muraro A, Rebai M, Tardocchi M, Giacomelli L, Rigamonti D, Taccogna F, Bruno D, Rutigliano M, D'Arienzo M, Tonti A, Panin F. On the road to ITER NBIs: SPIDER improvement after first operation and MITICA construction progress. Fusion Engineering and Design 2021. [DOI: 10.1016/j.fusengdes.2021.112622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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12
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Nemoto T, Takeshi K, Niimura H, Tobe M, Ito R, Kojima A, Saito H, Funatogawa T, Yamaguchi T, Katagiri N, Tsujino N, Mizuno M. Feasibility and acceptability of cognitive rehabilitation during the acute phase of schizophrenia. Early Interv Psychiatry 2021; 15:457-462. [PMID: 32219993 DOI: 10.1111/eip.12955] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 02/22/2020] [Accepted: 03/15/2020] [Indexed: 11/27/2022]
Abstract
AIM Although numerous studies have demonstrated promising results for the cognitive rehabilitation in subjects with schizophrenia, the efficacy of cognitive rehabilitation for everyday and social functioning is not yet sufficient. Although consideration of the contents and methods are vital, the timing for implementing cognitive rehabilitation also seems to be crucial. The aim of this study was to examine the feasibility and acceptability of cognitive rehabilitation during the acute phase of schizophrenia. METHODS Patients were recruited from consecutive acute admissions to the inpatient unit during a 15-month period and were evaluated to determine whether they could be enrolled in an 8-week cognitive rehabilitation program within 14 days of their hospital admission. Cognitive rehabilitation programs with a workbook style were adopted, taking the patients' conditions and burdens into consideration. RESULTS Eighty-three patients were newly admitted during the entry period, and 49 patients (59.0%) were eligible for inclusion. Of them, 22 patients (44.9%) agreed to participate and started the program. Sixteen patients completed the program and underwent a second assessment. Thus, 32.7% (16/49) of all the eligible patients actually completed the study. The participants were quite satisfied with the program. CONCLUSIONS This preliminary study yielded encouraging data demonstrating the feasibility and acceptability of cognitive remediation for patients with schizophrenia during the acute phase. The provision of cognitive rehabilitation during the acute phase of the first episode can reasonably be expected to lead to better functional outcomes.
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Affiliation(s)
- Takahiro Nemoto
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Kiyoaki Takeshi
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Hidehito Niimura
- Department of Neuropsychiatry, Keio University School of Medicine, Tokyo, Japan
| | - Miki Tobe
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Ryosuke Ito
- Funabashi Special Support Education School, Chiba, Japan
| | - Akiko Kojima
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Hiroko Saito
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Tomoyuki Funatogawa
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Taiju Yamaguchi
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Naoyuki Katagiri
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Naohisa Tsujino
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Masafumi Mizuno
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
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13
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Kojima A, Mi X, Fukushima Y, Ding WG, Omatsu-Kanbe M, Matsuura H. Elevation of propofol sensitivity of cardiac I Ks channel by KCNE1 polymorphism D85N. Br J Pharmacol 2021; 178:2690-2708. [PMID: 33763865 DOI: 10.1111/bph.15460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 03/13/2021] [Accepted: 03/16/2021] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND AND PURPOSE The slowly activating delayed rectifier K+ channel (IKs ), composed of pore-forming KCNQ1 α-subunits and ancillary KCNE1 β-subunits, regulates ventricular repolarization in human heart. Propofol, at clinically used concentrations, modestly inhibits the intact (wild-type) IKs channels and is therefore unlikely to appreciably prolong QT interval in ECG during anaesthesia. However, little information is available concerning the inhibitory effect of propofol on IKs channel associated with its gene variants implicated in QT prolongation. The KCNE1 single nucleotide polymorphism leading to D85N is associated with drug-induced QT prolongation and therefore regarded as a clinically important genetic variant. This study examined whether KCNE1-D85N affects the sensitivity of IKs to inhibition by propofol. EXPERIMENTAL APPROACH Whole-cell patch-clamp and immunostaining experiments were conducted in HEK293 cells and/or mouse cardiomyocyte-derived HL-1 cells, transfected with wild-type KCNQ1, wild-type or variant KCNE1 cDNAs. KEY RESULTS Propofol inhibited KCNQ1/KCNE1-D85N current more potently than KCNQ1/KCNE1 current in HEK293 cells and HL-1 cells. Immunostaining experiments in HEK293 cells revealed that pretreatment with propofol (10 μM) did not appreciably affect cell membrane expression of KCNQ1 and KCNE1 proteins in KCNQ1/KCNE1 and KCNQ1/KCNE1-D85N channels. CONCLUSION AND IMPLICATIONS The KCNE1 polymorphism D85N significantly elevates the sensitivity of IKs to inhibition by propofol. This study detects a functionally important role of KCNE1-D85N polymorphism in conferring genetic susceptibility to propofol-induced QT prolongation and further suggests the possibility that the inhibitory action of anaesthetics on ionic currents becomes exaggerated in patients carrying variants in genes encoding ion channels.
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Affiliation(s)
- Akiko Kojima
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Japan
| | - Xinya Mi
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan
| | - Yutaka Fukushima
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Japan
| | - Wei-Guang Ding
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan
| | | | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan
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14
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Matsuura H, Kojima A, Fukushima Y, Xie Y, Mi X, Sabirov RZ, Okada Y. Positive Inotropic Effects of ATP Released via the Maxi-Anion Channel in Langendorff-Perfused Mouse Hearts Subjected to Ischemia-Reperfusion. Front Cell Dev Biol 2021; 9:597997. [PMID: 33553176 PMCID: PMC7859278 DOI: 10.3389/fcell.2021.597997] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2020] [Accepted: 01/04/2021] [Indexed: 12/19/2022] Open
Abstract
The organic anion transporter SLCO2A1 constitutes an essential core component of the ATP-conductive large-conductance anion (Maxi-Cl) channel. Our previous experiments using Langendorff-perfused mouse hearts showed that the Maxi-Cl channel contributes largely to the release of ATP into the coronary effluent observed during 10-min reperfusion following a short period (6 min) of oxygen-glucose deprivation. The present study examined the effect of endogenous ATP released via Maxi-Cl channels on the left ventricular contractile function of Langendorff-perfused mouse hearts, using a fluid-filled balloon connected to a pressure transducer. After the initial 30-min stabilization period, the heart was then perfused with oxygen-glucose-deprived Tyrode solution for 6 min, which was followed by a 10-min perfusion with oxygenated normal Tyrode solution in the absence and presence of an ATP-hydrolyzing enzyme, apyrase, and/or an adenosine A1 receptor antagonist, 8-cyclopentyl-1,3-dipropylxanthine (DPCPX). In the absence of apyrase and DPCPX, the left ventricular developed pressure (LVDP) decreased from a baseline value of 72.3 ± 7.1 to 57.5 ± 5.5 mmHg (n = 4) at the end of 6-min perfusion with oxygen-glucose-deprived Tyrode solution, which was followed by a transient increase to 108.5 ± 16.5 mmHg during subsequent perfusion with oxygenated normal Tyrode solution. However, in the presence of apyrase and DPCPX, the LVDP decreased to the same degree during 6-min perfusion with oxygen-glucose-deprived Tyrode solution, but failed to exhibit a transient increase during a subsequent perfusion with oxygenated normal Tyrode solution. These results strongly suggest that endogenous ATP released through Maxi-Cl channels contributes to the development of transient positive inotropy observed during reperfusion after short-period hypoxia/ischemia in the heart.
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Affiliation(s)
- Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan
| | - Akiko Kojima
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Japan
| | - Yutaka Fukushima
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Japan
| | - Yu Xie
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan
| | - Xinya Mi
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan
| | - Ravshan Z Sabirov
- Institute of Biophysics and Biochemistry, National University of Uzbekistan, Tashkent, Uzbekistan
| | - Yasunobu Okada
- National Institute for Physiological Sciences (NIPS), Okazaki, Japan.,Department of Physiology, School of Medicine, Aichi Medical University, Nagakute, Japan.,Department of Physiology, Kyoto Prefectural University of Medicine, Kyoto, Japan
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15
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Uchino T, Nemoto T, Kojima A, Takubo Y, Kotsuji Y, Yamaguchi E, Yamaguchi T, Katagiri N, Tsujino N, Tanaka K, Mizuno M. Effects of motivation domains on social functioning in schizophrenia with consideration of the factor structure and confounding influences. J Psychiatr Res 2021; 133:106-112. [PMID: 33338732 DOI: 10.1016/j.jpsychires.2020.12.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Revised: 10/23/2020] [Accepted: 12/09/2020] [Indexed: 12/21/2022]
Abstract
In patients with schizophrenia, motivation has been assumed to act as an intervening factor between cognitive function and social functioning. Motivation is thought to comprise three domains defined by their orientations: intrinsic motivation, extrinsic motivation, and amotivation. Although these orientations can confound each other, the effects of motivation domains on social functioning remain obscure. We investigated these relationships after confirming the factor structure of social functioning using the Social Functioning Scale (SFS). A total of 97 stable outpatients with schizophrenia were recruited. In addition to the SFS, the General Causality Orientations Scale (GCOS) was used to measure the motivation domains. First, we examined the factor structure of the SFS using exploratory and confirmatory factor analyses. Next, we conducted structural equation modeling to examine the effects of motivation domains on social functioning. The SFS showed a two-factor structure: interpersonal and intrapersonal functioning. The structural equation model revealed that (1) amotivation was negatively related to both intrapersonal and interpersonal functioning, (2) intrinsic motivation was positively related only to intrapersonal functioning, and (3) extrinsic motivation was positively related only to interpersonal functioning. Each motivation domain was associated with different factors of social functioning. Future interventions aimed at improving social functioning should consider these motivation domains based on their orientations. Cognitive remediation accompanied by considerations for and approaches to each of the domains may maximize recovery in patients with schizophrenia.
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Affiliation(s)
- Takashi Uchino
- Department of Neuropsychiatry, Toho University Faculty of Medicine, 6-11-1 Omori-nishi, Ota-ku, Tokyo, 143-8541, Japan; Tokyo Adachi Hospital, 5-23-20 Hokima, Adachi-ku, Tokyo, 121-0064, Japan
| | - Takahiro Nemoto
- Department of Neuropsychiatry, Toho University Faculty of Medicine, 6-11-1 Omori-nishi, Ota-ku, Tokyo, 143-8541, Japan.
| | - Akiko Kojima
- Department of Neuropsychiatry, Toho University Faculty of Medicine, 6-11-1 Omori-nishi, Ota-ku, Tokyo, 143-8541, Japan
| | - Youji Takubo
- Department of Neuropsychiatry, Toho University Graduate School of Medicine, 5-21-16 Omori-nishi, Ota-ku, Tokyo, 143-8540, Japan
| | - Yumi Kotsuji
- Tokyo Adachi Hospital, 5-23-20 Hokima, Adachi-ku, Tokyo, 121-0064, Japan
| | - Eriko Yamaguchi
- Department of Neuropsychiatry, Toho University Graduate School of Medicine, 5-21-16 Omori-nishi, Ota-ku, Tokyo, 143-8540, Japan
| | - Taiju Yamaguchi
- Department of Neuropsychiatry, Toho University Faculty of Medicine, 6-11-1 Omori-nishi, Ota-ku, Tokyo, 143-8541, Japan
| | - Naoyuki Katagiri
- Department of Neuropsychiatry, Toho University Faculty of Medicine, 6-11-1 Omori-nishi, Ota-ku, Tokyo, 143-8541, Japan
| | - Naohisa Tsujino
- Department of Neuropsychiatry, Toho University Faculty of Medicine, 6-11-1 Omori-nishi, Ota-ku, Tokyo, 143-8541, Japan
| | - Kuniaki Tanaka
- Tokyo Adachi Hospital, 5-23-20 Hokima, Adachi-ku, Tokyo, 121-0064, Japan
| | - Masafumi Mizuno
- Department of Neuropsychiatry, Toho University Faculty of Medicine, 6-11-1 Omori-nishi, Ota-ku, Tokyo, 143-8541, Japan
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16
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Kojima A, Fukushima Y, Itoh H, Imoto K, Matsuura H. A computational analysis of the effect of sevoflurane in a human ventricular cell model of long QT syndrome: Importance of repolarization reserve in the QT-prolonging effect of sevoflurane. Eur J Pharmacol 2020; 883:173378. [DOI: 10.1016/j.ejphar.2020.173378] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 06/26/2020] [Accepted: 07/13/2020] [Indexed: 10/23/2022]
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17
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Onuma T, Iida M, Kito Y, Tanabe K, Kojima A, Nagase K, Uematsu K, Enomoto Y, Doi T, Tokuda H, Ogura S, Iwama T, Kozawa O, Iida H. Cigarette Smoking Cessation Temporarily Enhances the Release of Phosphorylated-HSP27 from Human Platelets. Intern Med 2020; 59:1841-1847. [PMID: 32350194 PMCID: PMC7474987 DOI: 10.2169/internalmedicine.4000-19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Objective Cigarette smoking is a risk factor for arteriopathy, including acute coronary syndrome, stroke and peripheral vascular disease. Thus, cessation is strongly recommended in order to reduce these risks. We recently demonstrated that smoking cessation causes temporary hyper-aggregability of human platelets. We previously showed that heat shock protein 27 (HSP27) is released from human platelets stimulated by collagen, accompanied by its phosphorylation. Accumulating evidence indicates potent roles of extracellular HSP27 as a modulator of inflammation. In the present study, using the stored samples obtained in the previous study, we investigated the effect of cigarette smoking cessation on the release of phosphorylated-HSP27 from collagen-activated human platelets (n=15 patients). Methods We enrolled patients who visited smoking cessation outpatient services between January 2012 and November 2014. Platelet-rich plasma, chronologically obtained before and after the cessation, was stimulated by collagen using a PA-200 aggregometer in the previous study. The levels of phosphorylated-HSP27 released from platelets were determined by an enzyme-linked immunosorbent assay. The phosphorylation of HSP27 in platelets was evaluated by a Western blot analysis. Results Cessation of cigarette smoking significantly upregulated the levels of collagen-stimulated release of phosphorylated-HSP27 at four and eight weeks after quitting smoking compared to before cessation. However, there was no significant difference between the levels before cessation and those at 12 weeks after cessation. The levels of phosphorylated-HSP27 stimulated by collagen in the platelets at four weeks after smoking cessation were remarkably enhanced compared to before cessation. Conclusion Cigarette smoking cessation temporarily enhances the collagen-stimulated release of phosphorylated-HSP27 from human platelets in the short term.
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Affiliation(s)
- Takashi Onuma
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Japan
| | - Mami Iida
- Department of General Medicine, Gifu Prefectural General Medical Center, Japan
| | - Yuko Kito
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Japan
| | - Kumiko Tanabe
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Japan
| | - Akiko Kojima
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Japan
| | - Kiyoshi Nagase
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Japan
| | - Kodai Uematsu
- Department of Neurosurgery, Gifu University Graduate School of Medicine, Japan
| | - Yukiko Enomoto
- Department of Neurosurgery, Gifu University Graduate School of Medicine, Japan
| | - Tomoaki Doi
- Department of Emergency and Disaster Medicine, Gifu University Graduate School of Medicine, Japan
| | - Haruhiko Tokuda
- Department of Clinical Laboratory/Medical Genome Center Biobank, National Center for Geriatrics and Gerontology, Japan
- Department of Pharmacology, Gifu University Graduate School of Medicine, Japan
| | - Shinji Ogura
- Department of Emergency and Disaster Medicine, Gifu University Graduate School of Medicine, Japan
| | - Toru Iwama
- Department of Neurosurgery, Gifu University Graduate School of Medicine, Japan
| | - Osamu Kozawa
- Department of Pharmacology, Gifu University Graduate School of Medicine, Japan
| | - Hiroki Iida
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Japan
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18
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Kojima Y, Kojima A, Niizeki Y, Yagishita K. Recreational diving-related injury insurance claims among Divers Alert Network Japan members: Retrospective analysis of 321 cases from 2010 to 2014. Diving Hyperb Med 2020; 50:92-97. [PMID: 32557409 DOI: 10.28920/dhm50.2.92-97] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2019] [Accepted: 12/11/2019] [Indexed: 11/05/2022]
Abstract
INTRODUCTION Monitoring trends in diving-related injuries enables implementation of effective safety measures. Divers Alert Network Japan (DAN Japan) membership includes insurance covering recreational diving-related injuries and fatalities. Use of claim data provides both a known denominator and demographic data about injured members. METHODS The study analysed 325 insurance claims reported to DAN Japan from 2010 to 2014. Four fatalities were excluded, leaving 321 claims for analysis. Claimants were divided into three age groups: young adults (< 40 years); middle-aged (40-59 years) and older adults (≥ 60 years). The total injury claims rate (ICR), decompression illness (DCI) rate (DCR) and trauma rate (TCR) were calculated. Differences between the sexes within each age group were analysed. RESULTS The total number of DAN Japan member-years in the period was 80,617, with a mean age of 45 years. Claims were made by 153 males and 168 females with a mean and median age of 46 years. Trauma was the most frequent reason for a claim (113 cases, 35%), followed by DCI (109 cases, 34%). The ICR (per 104 member-years) was 39.8 (95% confidence interval 35.5 to 44.2) and the TCR was 14.0 (11.4 to 16.6). For every age group, the ICR and TCR were significantly higher for females than males. The DCR was 13.5 (11.0 to 16.1) and did not significantly differ between the sexes. CONCLUSIONS The incidence of trauma-related diving injuries exceeds that of claims related to DCI. Females appear to have a higher risk of injury than the general diving population.
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Affiliation(s)
- Yasushi Kojima
- Divers Alert Network Japan (DAN Japan) / Japan Marine Recreation Association, Yokohama, Japan.,Hyperbaric Medical Center, Medical Hospital of Tokyo Medical and Dental University, Tokyo, Japan.,Tokio Marine & Nichido Medical Service Co. Ltd., Tokyo, Japan.,Corresponding author: Dr Yasushi Kojima, Divers Alert Network Japan (DAN Japan) / Japan Marine Recreation Association, 4-43 Honcho, Naka-ku, Yokohama-city, Kanagawa 231-0005, Japan,
| | - Akiko Kojima
- Divers Alert Network Japan (DAN Japan) / Japan Marine Recreation Association, Yokohama, Japan
| | - Yumi Niizeki
- Divers Alert Network Japan (DAN Japan) / Japan Marine Recreation Association, Yokohama, Japan.,Hyperbaric Medical Center, Medical Hospital of Tokyo Medical and Dental University, Tokyo, Japan.,Department of Orthopaedic Surgery, Soka Municipal Hospital, Saitama, Japan
| | - Kazuyoshi Yagishita
- Divers Alert Network Japan (DAN Japan) / Japan Marine Recreation Association, Yokohama, Japan.,Hyperbaric Medical Center, Medical Hospital of Tokyo Medical and Dental University, Tokyo, Japan
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19
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Fukushima Y, Kojima A, Mi X, Ding WG, Kitagawa H, Matsuura H. Open-channel blocking action of volatile anaesthetics desflurane and sevoflurane on human voltage-gated K v 1.5 channel. Br J Pharmacol 2020; 177:3811-3827. [PMID: 32436224 DOI: 10.1111/bph.15105] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Revised: 04/28/2020] [Accepted: 05/01/2020] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND AND PURPOSE Volatile anaesthetics have been shown to differentially modulate mammalian Shaker-related voltage-gated potassium (Kv 1.x) channels. This study was designed to investigate molecular and cellular mechanisms underlying the modulatory effects of desflurane or sevoflurane on human Kv 1.5 (hKv 1.5) channels. EXPERIMENTAL APPROACH Thirteen single-point mutations were constructed within pore domain of hKv 1.5 channel using site-directed mutagenesis. The effects of desflurane or sevoflurane on heterologously expressed wild-type and mutant hKv 1.5 channels were examined by whole-cell patch-clamp technique. A computer simulation was conducted to predict the docking pose of desflurane or sevoflurane within hKv 1.5 channel. KEY RESULTS Both desflurane and sevoflurane increased hKv 1.5 current at mild depolarizations but decreased it at strong depolarizations, indicating that these anaesthetics produce both stimulatory and inhibitory actions on hKv 1.5 channels. The inhibitory effect of desflurane or sevoflurane on hKv 1.5 channels arose primarily from its open-channel blocking action. The inhibitory action of desflurane or sevoflurane on hKv 1.5 channels was significantly attenuated in T480A, V505A, and I508A mutant channels, compared with wild-type channel. Computational docking simulation predicted that desflurane or sevoflurane resides within the inner cavity of channel pore and has contact with Thr479, Thr480, Val505, and Ile508. CONCLUSION AND IMPLICATIONS Desflurane and sevoflurane exert an open-channel blocking action on hKv 1.5 channels by functionally interacting with specific amino acids located within the channel pore. This study thus identifies a novel molecular basis mediating inhibitory modulation of hKv 1.5 channels by desflurane and sevoflurane.
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Affiliation(s)
- Yutaka Fukushima
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan.,Department of Anesthesiology, Shiga University of Medical Science, Otsu, Japan
| | - Akiko Kojima
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Japan
| | - Xinya Mi
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan
| | - Wei-Guang Ding
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan
| | - Hirotoshi Kitagawa
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Japan
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan
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20
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Tokuda H, Kusunose M, Senda K, Kojima K, Onuma T, Kojima A, Mizutani D, Enomoto Y, Iwama T, Iida H, Kozawa O. The release of phosphorylated-HSP27 from activated platelets of obstructive sleep apnea syndrome (OSAS) patients. Respir Investig 2020; 58:117-127. [PMID: 31838041 DOI: 10.1016/j.resinv.2019.10.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 10/17/2019] [Accepted: 10/31/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND Obstructive sleep apnea syndrome (OSAS) is a well known risk of arterial thrombosis that results in cardiovascular morbidity. It has been reported that platelet aggregability is enhanced in patients with OSAS. In the present study, we investigated whether phosphorylated-HSP27 is released from the activated platelets of OSAS patients. METHODS Patients diagnosed with OSAS (n = 21) were recruited, and platelet-rich plasma (PRP) was stimulated by ADP, ristosetin, collagen, and thrombin receptor-activating peptide. Platelet aggregation was measured using an aggregometer with a laser-scattering system. The levels of protein phosphorylation and the released levels of phosphorylated-HSP27 were determined by Western blot analysis and an ELISA, respectively. RESULTS The phosphorylation of HSP27 in the platelets was induced by the stimulators. The released levels of phosphorylated-HSP27 was correlated with the levels of phosphorylated-HSP27 stimulated by ADP or collagen. The levels of ADP-induced phosphorylated-HSP27 were correlated with those of both phosphorylated-protein kinase B (Akt) and phosphorylatd-p38 mitogen-activated protein kinase; however, the levels of phosphorylated-HSP27 stimulated by collagen were correlated with phosphorylated-Akt levels only. The ED50 value of ADP on the platelet aggregation in OSAS (1.067 ± 0.128 μM) was lower than that in healthy subjects (1.778 ± 0.122 μM) and was inversely correlated with both the value of minimum SpO2 and the released level of phosphorylated-HSP27 stimulated by ADP. CONCLUSION The results strongly suggest that phosphorylated-HSP27 is released from the activated platelets of OSAS patients.
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Affiliation(s)
- Haruhiko Tokuda
- Department of Clinical Laboratory/Biobank of Medical Genome Center, National Center for Geriatrics and Gerontology, Obu, 474-8511, Japan; Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu, 501-1194, Japan.
| | - Masaaki Kusunose
- Department of Respiratory Medicine, National Center for Geriatrics and Gerontology, Obu, 474-8511, Japan
| | - Kazuyoshi Senda
- Department of Respiratory Medicine, National Center for Geriatrics and Gerontology, Obu, 474-8511, Japan
| | - Kumi Kojima
- Department of Clinical Laboratory/Biobank of Medical Genome Center, National Center for Geriatrics and Gerontology, Obu, 474-8511, Japan
| | - Takashi Onuma
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Gifu, 501-1194, Japan
| | - Akiko Kojima
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Gifu, 501-1194, Japan
| | - Daisuke Mizutani
- Department of Neurosurgery, Gifu University Graduate School of Medicine, Gifu, 501-1194, Japan
| | - Yukiko Enomoto
- Department of Neurosurgery, Gifu University Graduate School of Medicine, Gifu, 501-1194, Japan
| | - Toru Iwama
- Department of Neurosurgery, Gifu University Graduate School of Medicine, Gifu, 501-1194, Japan
| | - Hiroki Iida
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Gifu, 501-1194, Japan
| | - Osamu Kozawa
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu, 501-1194, Japan
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21
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Yoshida M, Oohara W, Ichikawa M, Hiratsuka J, Saquilayan GQ, Umeda N, Kojima A, Kashiwagi M. Analysis of the cesium distribution in the JT-60SA negative ion sources for steady long-pulse operation. Rev Sci Instrum 2020; 91:033313. [PMID: 32259933 DOI: 10.1063/1.5131103] [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] [Received: 10/09/2019] [Accepted: 02/27/2020] [Indexed: 06/11/2023]
Abstract
To realize stable negative ion beams for 100 s required in the neutral beam injector of JT-60SA, a physical model to control cesium (Cs) distribution inside the negative ion source has been developed in order to maintain the stable negative ion production at the plasma grid (PG) surface with Cs. In this work, to quantitatively evaluate Cs coverage on the PG, a three-dimensional Cs transportation code was introduced to consider the spatial Cs distribution in the source. The spatial temperature distribution of the chamber wall was also introduced in this model. As a result, the reasonable variation of the Cs coverage for 100 s was obtained, compared to that in the initial model. Based on the modified model, the operational temperature of the chamber wall was proposed to be less than 60 °C to suppress the desorption of Cs in the chamber wall and to sustain the stable negative ion production. In addition, it was also suggested that a slightly higher wall temperature before the operation leads to a decrease in the amount of Cs stored at the chamber wall, resulting in suppression of Cs consumption in the ion source.
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Affiliation(s)
- M Yoshida
- Division of Electrical, Electronic, and Information Engineering, Yamaguchi University, Ube 755-8611, Japan
| | - W Oohara
- Division of Electrical, Electronic, and Information Engineering, Yamaguchi University, Ube 755-8611, Japan
| | - M Ichikawa
- National Institutes for Quantum and Radiological Science and Technology, 801-1, Mukouyama, Naka 311-0193, Japan
| | - J Hiratsuka
- National Institutes for Quantum and Radiological Science and Technology, 801-1, Mukouyama, Naka 311-0193, Japan
| | - G Q Saquilayan
- National Institutes for Quantum and Radiological Science and Technology, 801-1, Mukouyama, Naka 311-0193, Japan
| | - N Umeda
- National Institutes for Quantum and Radiological Science and Technology, 801-1, Mukouyama, Naka 311-0193, Japan
| | - A Kojima
- National Institutes for Quantum and Radiological Science and Technology, 801-1, Mukouyama, Naka 311-0193, Japan
| | - M Kashiwagi
- National Institutes for Quantum and Radiological Science and Technology, 801-1, Mukouyama, Naka 311-0193, Japan
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22
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Hiratsuka J, Kashiwagi M, Ichikawa M, Umeda N, Saquilayan GQ, Tobari H, Watanabe K, Kojima A, Yoshida M. Achievement of high power and long pulse negative ion beam acceleration for JT-60SA NBI. Rev Sci Instrum 2020; 91:023506. [PMID: 32113410 DOI: 10.1063/1.5131302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Accepted: 01/16/2020] [Indexed: 06/10/2023]
Abstract
Long pulse acceleration of hydrogen negative ion beams with the power density over 70 MW/m2 and the pulse length over 100 s has been demonstrated for the first time by using a multi-aperture 3-stage accelerator. Such long pulse acceleration was achieved by integrating the design of beam optics and voltage holding capability to meet the requirements of JT-60SA. By using the newly designed accelerator for JT-60SA, voltage holding at 500 kV with beam acceleration was stably sustained even after 5 g of cesium was seeded, and heat load on each acceleration grid was reduced below the allowable level for long pulse, less than 5% of total acceleration power. As a result, 500 keV, 154 A/m2 for 118 s beam acceleration was achieved, which satisfies the requirement of the negative ion source for JT-60SA. This pulse length of such high-power density beams is longest in the world. In addition, the result contributes to the long pulse acceleration of multi-stage electrostatic accelerators, such as 1 MeV negative ion accelerator for ITER.
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Affiliation(s)
- J Hiratsuka
- National Institutes for Quantum and Radiological Science and Technology (QST), 801-1 Mukoyama, Naka 311-0193, Japan
| | - M Kashiwagi
- National Institutes for Quantum and Radiological Science and Technology (QST), 801-1 Mukoyama, Naka 311-0193, Japan
| | - M Ichikawa
- National Institutes for Quantum and Radiological Science and Technology (QST), 801-1 Mukoyama, Naka 311-0193, Japan
| | - N Umeda
- National Institutes for Quantum and Radiological Science and Technology (QST), 801-1 Mukoyama, Naka 311-0193, Japan
| | - G Q Saquilayan
- National Institutes for Quantum and Radiological Science and Technology (QST), 801-1 Mukoyama, Naka 311-0193, Japan
| | - H Tobari
- National Institutes for Quantum and Radiological Science and Technology (QST), 801-1 Mukoyama, Naka 311-0193, Japan
| | - K Watanabe
- National Institutes for Quantum and Radiological Science and Technology (QST), 801-1 Mukoyama, Naka 311-0193, Japan
| | - A Kojima
- National Institutes for Quantum and Radiological Science and Technology (QST), 801-1 Mukoyama, Naka 311-0193, Japan
| | - M Yoshida
- Department of Electrical, Electronic, and Information Engineering, Yamaguchi University, Ube 755-8611, Japan
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23
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Mizutani D, Onuma T, Tanabe K, Kojima A, Uematsu K, Nakashima D, Doi T, Enomoto Y, Matsushima-Nishiwaki R, Tokuda H, Ogura S, Iida H, Kozawa O, Iwama T. Olive polyphenol reduces the collagen-elicited release of phosphorylated HSP27 from human platelets. Biosci Biotechnol Biochem 2019; 84:536-543. [PMID: 31760852 DOI: 10.1080/09168451.2019.1697196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Hydroxytyrosol (HT) and oleuropein (OLE) are natural polyphenols found in extra virgin olive oil. Accumulating evidence indicates that ingestion of olive oil contributes to reduce the risk of cardiovascular diseases and stroke. It has been reported that HT and OLE inhibit human platelet aggregation. We have shown that collagen induces the phosphorylation of heat shock protein 27 (HSP27) in human platelets, resulting in the release of HSP27, an extracellular pro-inflammatory agent. In this study, we investigated the effects of HT and OLE on the collagen-stimulated human platelet activation. The PDGF-AB secretion and the soluble CD40 ligand (sCD40L) release by collagen were reduced by HT or OLE. HT and OLE significantly suppressed the phosphorylation of HSP27 and the release of phosphorylated-HSP27. These findings suggest that olive polyphenol reduces the collagen-stimulated phosphorylation of HSP27 in human platelets and the release. Our results may provide a novel anti- inflammatory effect of olive polyphenol.
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Affiliation(s)
- Daisuke Mizutani
- Department of Neurosurgery, Gifu University Graduate School of Medicine, Gifu, Japan.,Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Takashi Onuma
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu, Japan.,Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Kumiko Tanabe
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Akiko Kojima
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Kodai Uematsu
- Department of Neurosurgery, Gifu University Graduate School of Medicine, Gifu, Japan.,Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Daiki Nakashima
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu, Japan.,Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Tomoaki Doi
- Department of Emergency and Disaster Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Yukiko Enomoto
- Department of Neurosurgery, Gifu University Graduate School of Medicine, Gifu, Japan
| | | | - Haruhiko Tokuda
- Department of Clinical Labolatory/Medical Genome Center Biobank, National Center for Geriatrics and Gerontology, Obu, Japan
| | - Shinji Ogura
- Department of Emergency and Disaster Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Hiroki Iida
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Osamu Kozawa
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Toru Iwama
- Department of Neurosurgery, Gifu University Graduate School of Medicine, Gifu, Japan
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24
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Hashimoto E, Kojima A, Kitagawa H, Matsuura H. Anesthetic Management of a Patient With Type 1 Long QT Syndrome Using Combined Epidural-Spinal Anesthesia for Caesarean Section: Perioperative Approach Based on Ion Channel Function. J Cardiothorac Vasc Anesth 2019; 34:465-469. [PMID: 31371065 DOI: 10.1053/j.jvca.2019.07.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 06/30/2019] [Accepted: 07/02/2019] [Indexed: 11/11/2022]
Affiliation(s)
- Eisuke Hashimoto
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Akiko Kojima
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga, Japan.
| | - Hirotoshi Kitagawa
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
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25
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Tanabe K, Kojima A, Tachi J, Nakashima D, Kozawa O, Iida H. Limitation by Rho-kinase and Rac of transforming growth factor-β-induced interleukin-6 release from astrocytes. Neurosci Lett 2019; 696:191-196. [DOI: 10.1016/j.neulet.2018.12.040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 12/22/2018] [Accepted: 12/27/2018] [Indexed: 11/29/2022]
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26
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Ding WG, Tano A, Mi X, Kojima A, Seto T, Matsuura H. Identification of Verapamil Binding Sites Within Human Kv1.5 Channel Using Mutagenesis and Docking Simulation. Cell Physiol Biochem 2019; 52:302-314. [PMID: 30816676 DOI: 10.33594/000000022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 01/10/2019] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND/AIMS The phenylalkylamine class of L-type Ca2+ channel antagonist verapamil prolongs the effective refractory period (ERP) of human atrium, which appears to contribute to the efficacy of verapamil in preventing reentrant-based atrial arrhythmias including atrial fibrillation. This study was designed to investigate the molecular and electrophysiological mechanism underlying the action of verapamil on human Kv1.5 (hKv1.5) channel that determines action potential duration and ERP in human atrium. METHODS Site-directed mutagenesis created 10 single-point mutations within pore region of hKv1.5 channel. Wholecell patch-clamp method investigated the effect of verapamil on wild-type and mutant hKv1.5 channels heterologously expressed in Chinese hamster ovary cells. Docking simulation was conducted using open-state homology model of hKv1.5 channel pore. RESULTS Verapamil preferentially blocked hKv1.5 channel in its open state with IC50 of 2.4±0.6 μM (n = 6). The blocking effect of verapamil was significantly attenuated in T479A, T480A, I502A, V505A, I508A, L510A, V512A and V516A mutants, compared with wild-type hKv1.5 channel. Computer docking simulation predicted that verapamil is positioned within central cavity of channel pore and has contact with Thr479, Thr480, Val505, Ile508, Ala509, Val512, Pro513 and Val516. CONCLUSION Verapamil acts as an open-channel blocker of hKv1.5 channel, presumably due to direct binding to specific amino acids within pore region of hKv1.5 channel, such as Thr479, Thr480, Val505, Ile508, Val512 and Val516. This blocking effect of verapamil on hKv1.5 channel appears to contribute at least partly to prolongation of atrial ERP and resultant antiarrhythmic action on atrial fibrillation in humans.
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Affiliation(s)
- Wei-Guang Ding
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan
| | - Ayami Tano
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan
| | - Xinya Mi
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan
| | - Akiko Kojima
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Japan
| | - Tomoyoshi Seto
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Japan
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan,
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27
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Sakai K, Inoue M, Nishimura H, Mikami S, Kuwabara Y, Kojima A, Toda M, Kobayashi Y, Kikuchi S, Hirata Y, Kyoyama H, Moriyama G, Gemma A, Uematsu K. P2.06-31 Inhibition of Heat Shock Protein 70 Function Suppresses Proliferation in Mesothelioma Cells. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.08.1286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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28
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Tsujino N, Tagata H, Baba Y, Kojima A, Yamaguchi T, Katagiri N, Nemoto T, Mizuno M. Survey of recognition and treatment of at-risk mental state by Japanese psychiatrists. Psychiatry Clin Neurosci 2018; 72:391-398. [PMID: 29485233 DOI: 10.1111/pcn.12647] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2017] [Revised: 02/16/2018] [Accepted: 02/20/2018] [Indexed: 11/27/2022]
Abstract
AIM The importance of early intervention in psychiatry is widely recognized among psychiatrists. However, it is unknown whether precise knowledge of at-risk mental state has been disseminated. With this survey, we aimed to reveal how Japanese psychiatrists diagnose patients with at-risk mental state and prescribe treatment strategies for them. METHODS Using fictional case vignettes, we conducted a questionnaire survey of psychiatrists (n = 1399) who worked in Tokyo. We mailed study documents to all eligible participants in November 2015 with a requested return date in December. RESULTS Two hundred and sixty (19.3%) psychiatrists responded to the survey. Their correct diagnosis rates for the patients in the at-risk mental state vignettes were low (14.6% for the vignette describing at-risk mental state with attenuated positive symptom syndrome; 13.1% for the vignette describing at-risk mental state with brief intermittent psychotic syndrome). Many psychiatrists selected pharmacotherapy and antipsychotics to treat patients in the at-risk mental state vignettes. The psychiatrists who correctly diagnosed patients in the at-risk mental state vignettes had significantly fewer years of clinical psychiatric experience than did those who diagnosed them as having a non-at-risk mental state (12.5 years vs 22.7 years for the vignette describing at-risk mental state with attenuated positive symptom syndrome, P < 0.01; 14.3 years vs 22.2 years for the vignette describing at-risk mental state with brief intermittent psychotic syndrome, P < 0.01). CONCLUSION This study suggests that precise knowledge of at-risk mental state has not been disseminated among Japanese psychiatrists.
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Affiliation(s)
- Naohisa Tsujino
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan.,Department of Psychiatry, Saiseikai Yokohamashi Tobu Hospital, Kanagawa, Japan
| | - Hiromi Tagata
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Yoko Baba
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Akiko Kojima
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Taiju Yamaguchi
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Naoyuki Katagiri
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Takahiro Nemoto
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
| | - Masafumi Mizuno
- Department of Neuropsychiatry, Toho University School of Medicine, Tokyo, Japan
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29
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Toigo V, Piovan R, Dal Bello S, Gaio E, Luchetta A, Pasqualotto R, Zaccaria P, Bigi M, Chitarin G, Marcuzzi D, Pomaro N, Serianni G, Agostinetti P, Agostini M, Antoni V, Aprile D, Baltador C, Barbisan M, Battistella M, Boldrin M, Brombin M, Dalla Palma M, De Lorenzi A, Delogu R, De Muri M, Fellin F, Ferro A, Finotti C, Fiorentin A, Gambetta G, Gnesotto F, Grando L, Jain P, Maistrello A, Manduchi G, Marconato N, Moresco M, Ocello E, Pavei M, Peruzzo S, Pilan N, Pimazzoni A, Recchia M, Rizzolo A, Rostagni G, Sartori E, Siragusa M, Sonato P, Sottocornola A, Spada E, Spagnolo S, Spolaore M, Taliercio C, Valente M, Veltri P, Zamengo A, Zaniol B, Zanotto L, Zaupa M, Boilson D, Graceffa J, Svensson L, Schunke B, Decamps H, Urbani M, Kushwah M, Chareyre J, Singh M, Bonicelli T, Agarici G, Masiello A, Paolucci F, Simon M, Bailly-Maitre L, Bragulat E, Gomez G, Gutierrez D, Mico G, Moreno JF, Pilard V, Kashiwagi M, Hanada M, Tobari H, Watanabe K, Maeshima T, Kojima A, Umeda N, Yamanaka H, Chakraborty A, Baruah U, Rotti C, Patel H, Nagaraju M, Singh N, Patel A, Dhola H, Raval B, Fantz U, Heinemann B, Kraus W, Hanke S, Hauer V, Ochoa S, Blatchford P, Chuilon B, Xue Y, De Esch H, Hemsworth R, Croci G, Gorini G, Rebai M, Muraro A, Cavenago M, D'Arienzo M, Sandri S. A substantial step forward in the realization of the ITER HNB system: The ITER NBI Test Facility. Fusion Engineering and Design 2017. [DOI: 10.1016/j.fusengdes.2016.11.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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30
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Nishio S, Shibata T, Yamaguchi S, Kanao H, Kojima A, Takekuma M, Tozawa A, Tokunaga H, Miyagi E, Kato H, Kurihara K, Yanase T, Ushijima K, Mikami M, Sugiyama T. Investigation of the clinicopathological features of vulva cancer: a retrospective survey of the JGOG Net Work study. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx372.054] [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: 11/14/2022] Open
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31
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Miyata Y, Ishii K, Kojima A, Yamaguchi T, Fujimoto S, Kaidou N, Kakiuchi H, Cho T. Detection of Bounce Ions by Use of Charge Exchange Bounce Ion Analyzer. Fusion Science and Technology 2017. [DOI: 10.13182/fst07-a1381] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Y. Miyata
- Plasma Research Center, University of Tsukuba, Ibaraki 305-8577, JAPAN
| | - K. Ishii
- Plasma Research Center, University of Tsukuba, Ibaraki 305-8577, JAPAN
| | - A. Kojima
- Fusion Research and Development, Japan Atomic Energy Agency, Ibaraki 311-0913, JAPAN
| | - T. Yamaguchi
- Plasma Research Center, University of Tsukuba, Ibaraki 305-8577, JAPAN
| | - S. Fujimoto
- Plasma Research Center, University of Tsukuba, Ibaraki 305-8577, JAPAN
| | - N. Kaidou
- Plasma Research Center, University of Tsukuba, Ibaraki 305-8577, JAPAN
| | - H. Kakiuchi
- Plasma Research Center, University of Tsukuba, Ibaraki 305-8577, JAPAN
| | - T. Cho
- Plasma Research Center, University of Tsukuba, Ibaraki 305-8577, JAPAN
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32
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Cho T, Higaki H, Hirata M, Hojo H, Ichimura M, Ishii K, Islam K, Itakura A, Katanuma I, Kohagura J, Minami R, Nakashima Y, Numakura T, Saito T, Tatematsu Y, Yoshikawa M, Watanabe O, Kubota Y, Kobayashi T, Yamaguchi Y, Saimaru H, Higashizono Y, Miyata Y, Kiminami S, Shimizu K, Itou M, Ikuno T, Mase A, Yasaka Y, Sakamoto K, Yoshida M, Kojima A, Ogura K, Nishino N, Horton W, Kariya T, Imai T, Pastukhov V, Miyoshi S. Overview of Recent Progress in the GAMMA 10 Tandem Mirror. Fusion Science and Technology 2017. [DOI: 10.13182/fst07-a1305] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- T. Cho
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - H. Higaki
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - M. Hirata
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - H. Hojo
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - M. Ichimura
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - K. Ishii
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - K. Islam
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - A. Itakura
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - I. Katanuma
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - J. Kohagura
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - R. Minami
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - Y. Nakashima
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - T. Numakura
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - T. Saito
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - Y. Tatematsu
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - M. Yoshikawa
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - O. Watanabe
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - Y. Kubota
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - T. Kobayashi
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - Y. Yamaguchi
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - H. Saimaru
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - Y. Higashizono
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - Y. Miyata
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - S. Kiminami
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - K. Shimizu
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - M. Itou
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - T. Ikuno
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - A. Mase
- Art, Science and Technology Center for Cooperative Research, Kyushu University, Japan
| | - Y. Yasaka
- Department of Electrical and Electronics Engineering, Kobe University, Japan
| | - K. Sakamoto
- Naka Fusion Research Establishment, Japan Atomic Energy Agency, Japan
| | - M. Yoshida
- Naka Fusion Research Establishment, Japan Atomic Energy Agency, Japan
| | - A. Kojima
- Naka Fusion Research Establishment, Japan Atomic Energy Agency, Japan
| | - K. Ogura
- Graduate School of Science and Technology, Niigata University, Japan
| | - N. Nishino
- Graduated School of Engineering, Hiroshima University, Japan
| | - W. Horton
- Institute for Fusion Studies, The University of Texas at Austin, USA
| | - T. Kariya
- Toshiba Electron Tubes and Devices Co. Ltd., Tochigi, Japan
| | - T. Imai
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
| | - V.P. Pastukhov
- Russian Research Center “Kurchatov Institute”, Moscow, Russia Kurchatov Institute, Russia
| | - S. Miyoshi
- Plasma Research Center, University of Tsukuba, Ibaraki, Japan
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Imashuku Y, Kojima A, Takahashi K, Kitagawa H. Problematic use of a Pentax AWS-S200 in emergency and disaster medicine. Anaesthesia 2017; 72:1045. [DOI: 10.1111/anae.13944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Y. Imashuku
- Shiga University of Medical Science; Shiga Japan
| | - A. Kojima
- Shiga University of Medical Science; Shiga Japan
| | - K. Takahashi
- Shiga University of Medical Science; Shiga Japan
| | - H. Kitagawa
- Shiga University of Medical Science; Shiga Japan
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Koga Y, Takahashi M, Kojima A, Takaki Y, Tomiguchi S, Hirota Y, Kugiyama K, Yasue H, Hayasaki K. Decreased Perfusion in Myocardial Region of Normal Donor Artery Secondary to Collateral Development. Acta Radiol 2016. [DOI: 10.1177/028418519203300103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Thirty-one patients suffering from single vessel exertional angina with collaterals (Group A) were evaluated by stress 201T1 myocardial emission CT (T1-SPECT) with 16 controls of severely stenotic single vessel exertional angina without collaterals (Group B). Group A included 21 patients (68%) who showed an extensive perfusion defect in double artery myocardial regions, including the normal donor artery myocardial region (DMR). However, there were no such cases in Group B, giving a significant difference between these 2 groups (p < 0.001). Four patients in Group A, having a perfusion defect both in DMR and in the collateral dependent myocardial region (CMR) underwent a successful percutaneous transluminal coronary angioplasty (PTCA) with disappearance of collaterals. T1-SPECT findings after PTCA showed no perfusion defect either in CMR or in DMR. This has been explained on the basis that the coronary collaterals stole blood and produced perfusion defect in DMR.
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Kojima A, Bai JY, Ito Y, Ding WG, Kitagawa H, Matsuura H. Serum albumin attenuates the open-channel blocking effects of propofol on the human Kv1.5 channel. Eur J Pharmacol 2016; 783:117-26. [DOI: 10.1016/j.ejphar.2016.04.058] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Revised: 04/26/2016] [Accepted: 04/28/2016] [Indexed: 11/29/2022]
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Tsujimoto M, Tokuda H, Kuroyanagi G, Yamamoto N, Kainuma S, Matsushima-Nishiwaki R, Onuma T, Iida Y, Kojima A, Sawada S, Doi T, Enomoto Y, Tanabe K, Akamatsu S, Iida H, Ogura S, Otsuka T, Kozawa O, Iwama T. AICAR reduces the collagen-stimulated secretion of PDGF-AB and release of soluble CD40 ligand from human platelets: Suppression of HSP27 phosphorylation via p44/p42 MAP kinase. Exp Ther Med 2016; 12:1107-1112. [PMID: 27446328 DOI: 10.3892/etm.2016.3435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Accepted: 04/22/2016] [Indexed: 11/06/2022] Open
Abstract
We have previously reported that collagen-induced phosphorylation of heat shock protein (HSP) 27 via p44/p42 mitogen-activated protein (MAP) kinase in human platelets is sufficient to induce the secretion of platelet-derived growth factor (PDGF)-AB and the release of soluble cluster of differentiation 40 ligand (sCD40L). Adenosine monophosphate-activated protein kinase (AMPK), which is known to regulate energy homeostasis, has a crucial role as an energy sensor in various eukaryotic cells. The present study investigated the effects of 5-aminoimidazole-4-carboxamide-1-β-d-ribofuranosyl 5'-monophosphate (AICAR), which is an activator of AMPK, on the collagen-induced activation of human platelets. It was demonstrated that AICAR dose-dependently reduced collagen-stimulated platelet aggregation up to 1.0 µM. Analysis of the size of platelet aggregates demonstrated that AICAR decreased the ratio of large aggregates (50-70 µm), whereas the ratio of small aggregates (9-25 µm) was increased by AICAR administration. AICAR markedly attenuated the phosphorylation levels of p44/p42 MAP kinase and HSP27, which are induced by collagen. Furthermore, AICAR significantly decreased the secretion of PDGF-AB and the collagen-induced release of sCD40L. These results indicated that AICAR-activated AMPK may reduce the secretion of PDGF-AB and the collagen-induced release of sCD40L by inhibiting HSP27 phosphorylation via p44/p42 MAP kinase in human platelets.
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Affiliation(s)
- Masanori Tsujimoto
- Department of Neurosugery, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan; Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan
| | - Haruhiko Tokuda
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan; Department of Clinical Laboratory, National Center for Geriatrics and Gerontology, Obu, Aichi 474-8511, Japan
| | - Gen Kuroyanagi
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan; Department of Orthopedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi 467-8603, Japan
| | - Naohiro Yamamoto
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan; Department of Orthopedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi 467-8603, Japan
| | - Shingo Kainuma
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan; Department of Orthopedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi 467-8603, Japan
| | | | - Takashi Onuma
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan; Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan
| | - Yuko Iida
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan; Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan
| | - Akiko Kojima
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan; Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan; Department of Anesthesiology and Critical Care Medicine, Matsunami General Hospital, Gifu 501-6062, Japan
| | - Shigenobu Sawada
- Department of Neurosugery, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan
| | - Tomoaki Doi
- Department of Emergency and Disaster Medicine, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan
| | - Yukiko Enomoto
- Department of Neurosugery, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan
| | - Kumiko Tanabe
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan
| | - Shigeru Akamatsu
- Department of Anesthesiology and Critical Care Medicine, Matsunami General Hospital, Gifu 501-6062, Japan
| | - Hiroki Iida
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan
| | - Shinji Ogura
- Department of Emergency and Disaster Medicine, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan
| | - Takanobu Otsuka
- Department of Orthopedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi 467-8603, Japan
| | - Osamu Kozawa
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan
| | - Toru Iwama
- Department of Neurosugery, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan
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Imashuku Y, Kojima A, Takahashi K, Kitagawa H. Endotracheal intubation training for clinical trainees in Japan—is the anesthesiology training not necessary? J Clin Anesth 2016; 31:34. [DOI: 10.1016/j.jclinane.2015.12.032] [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] [Received: 12/13/2015] [Accepted: 12/21/2015] [Indexed: 10/22/2022]
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38
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Hanada M, Kojima A, Tobari H, Nishikiori R, Hiratsuka J, Kashiwagi M, Umeda N, Yoshida M, Ichikawa M, Watanabe K, Yamano Y, Grisham LR. Development of the negative ion beams relevant to ITER and JT-60SA at Japan Atomic Energy Agency. Rev Sci Instrum 2016; 87:02B322. [PMID: 26932050 DOI: 10.1063/1.4934584] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In order to realize negative ion sources and accelerators to be applicable to International Thermonuclear Experimental Reactor and JT-60 Super Advanced, a large cesium (Cs)-seeded negative ion source and a multi-aperture and multi-stage electric acceleration have been developed at Japan Atomic Energy Agency (JAEA). Long pulse production and acceleration of the negative ion beams have been independently carried out. The long pulse production of the high current beams has achieved 100 s at the beam current of 15 A by modifying the JT-60 negative ion source. The pulse duration time is increased three times longer than that before the modification. As for the acceleration, a pulse duration time has been also extended two orders of magnitudes from 0.4 s to 60 s. The developments of the negative ion source and acceleration at JAEA are well in progress towards the realization of the negative ion sources and accelerators for fusion applications.
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Affiliation(s)
- M Hanada
- Japan Atomic Energy Agency, 801-1 Mukouyama, Naka-shi, Ibaraki-ken 319-0913, Japan
| | - A Kojima
- Japan Atomic Energy Agency, 801-1 Mukouyama, Naka-shi, Ibaraki-ken 319-0913, Japan
| | - H Tobari
- Japan Atomic Energy Agency, 801-1 Mukouyama, Naka-shi, Ibaraki-ken 319-0913, Japan
| | - R Nishikiori
- Japan Atomic Energy Agency, 801-1 Mukouyama, Naka-shi, Ibaraki-ken 319-0913, Japan
| | - J Hiratsuka
- Japan Atomic Energy Agency, 801-1 Mukouyama, Naka-shi, Ibaraki-ken 319-0913, Japan
| | - M Kashiwagi
- Japan Atomic Energy Agency, 801-1 Mukouyama, Naka-shi, Ibaraki-ken 319-0913, Japan
| | - N Umeda
- Japan Atomic Energy Agency, 801-1 Mukouyama, Naka-shi, Ibaraki-ken 319-0913, Japan
| | - M Yoshida
- Japan Atomic Energy Agency, 801-1 Mukouyama, Naka-shi, Ibaraki-ken 319-0913, Japan
| | - M Ichikawa
- Japan Atomic Energy Agency, 801-1 Mukouyama, Naka-shi, Ibaraki-ken 319-0913, Japan
| | - K Watanabe
- Japan Atomic Energy Agency, 801-1 Mukouyama, Naka-shi, Ibaraki-ken 319-0913, Japan
| | - Y Yamano
- Saitama University, Saitama, Saitama-ken 338-8570, Japan
| | - L R Grisham
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
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Tanaka A, Kasugai T, Kojima A, Minami E, Niwa T, Ihara N, Kitazawa T, Hanatate F, Kobayashi K, Matsunami H, Saito Y. [Successful Case of Coil Embolization for Repeated Pulmonary Arterial Bleeding in Postoperative Empyema with Bronchopleural Fistula]. Kyobu Geka 2016; 69:95-98. [PMID: 27075148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A 78-year-old woman underwent right S6 segmentectomy and upper lobe partial resection for adenocarcinoma. About 11 months after the operation, she was diagnosed as having empyema with bronchopleural fistula and open thoracotomy was performed. From the following day, active hemorrhage from the pulmonary artery into the thoracic cavity(500~800 ml) repeated. Tamponade, surgical treatment such as putting hemostasis sheet, or covering with a pedicled latissimus dorsi muscle flap could not prevent rebleeding. Therefore selective pulmonary artery coil embolization was performed, after that the rebleeding did not occur.
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Affiliation(s)
- Aki Tanaka
- Department of Anesthesiology and Intensive Care Unit, Matsunami General Hospital, Gifu, Japan
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Miyamoto K, Nishioka S, Goto I, Hatayama A, Hanada M, Kojima A, Hiratsuka J. Analysis of the beam halo in negative ion sources by using 3D3V PIC code. Rev Sci Instrum 2016; 87:02B124. [PMID: 26932006 DOI: 10.1063/1.4932390] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The physical mechanism of the formation of the negative ion beam halo and the heat loads of the multi-stage acceleration grids are investigated with the 3D PIC (particle in cell) simulation. The following physical mechanism of the beam halo formation is verified: The beam core and the halo consist of the negative ions extracted from the center and the periphery of the meniscus, respectively. This difference of negative ion extraction location results in a geometrical aberration. Furthermore, it is shown that the heat loads on the first acceleration grid and the second acceleration grid are quantitatively improved compared with those for the 2D PIC simulation result.
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Affiliation(s)
- K Miyamoto
- Naruto University of Education, 748 Nakashima, Takashima, Naruto-cho, Naruto-shi, Tokushima 772-8502, Japan
| | - S Nishioka
- Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - I Goto
- Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - A Hatayama
- Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - M Hanada
- Japan Atomic Energy Agency, 801-1 Mukouyama, Naka 319-0913, Japan
| | - A Kojima
- Japan Atomic Energy Agency, 801-1 Mukouyama, Naka 319-0913, Japan
| | - J Hiratsuka
- Japan Atomic Energy Agency, 801-1 Mukouyama, Naka 319-0913, Japan
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Yoshida M, Hanada M, Kojima A, Kashiwagi M, Umeda N, Hiratsuka J, Ichikawa M, Watanabe K, R Grisham L, Tsumori K, Kisaki M. Time evolution of negative ion profile in a large cesiated negative ion source applicable to fusion reactors. Rev Sci Instrum 2016; 87:02B144. [PMID: 26932026 DOI: 10.1063/1.4938406] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
To understand the physics of the cesium (Cs) recycling in the large Cs-seeded negative ion sources relevant to ITER and JT-60SA with ion extraction area of 45-60 cm × 110-120 cm, the time evolution of the negative ion profile was precisely measured in JT-60SA where the ion extraction area is longitudinally segmented into 5. The Cs was seeded from the oven at 180 °C to the ion source. After 1 g of Cs input, surface production of the negative ions appeared only in the central segment where a Cs nozzle was located. Up to 2 g of Cs, the negative ion profile was longitudinally expanded over full ion extraction area. The measured time evolution of the negative ion profile has the similar tendency of distribution of the Cs atoms that is calculated. From the results, it is suggested that Cs atom distribution is correlated with the formation of the negative ion profile.
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Affiliation(s)
- M Yoshida
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - M Hanada
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - A Kojima
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - M Kashiwagi
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - N Umeda
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - J Hiratsuka
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - M Ichikawa
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - K Watanabe
- Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193, Japan
| | - L R Grisham
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
| | - K Tsumori
- National Institute for Fusion Science, Toki, Gifu 509-5792, Japan
| | - M Kisaki
- National Institute for Fusion Science, Toki, Gifu 509-5792, Japan
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Kojima A, Hanada M, Tobari H, Nishikiori R, Hiratsuka J, Kashiwagi M, Umeda N, Yoshida M, Ichikawa M, Watanabe K, Yamano Y, Grisham LR. Development of design technique for vacuum insulation in large size multi-aperture multi-grid accelerator for nuclear fusion. Rev Sci Instrum 2016; 87:02B304. [PMID: 26932032 DOI: 10.1063/1.4931803] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Design techniques for the vacuum insulation have been developed in order to realize a reliable voltage holding capability of multi-aperture multi-grid (MAMuG) accelerators for fusion application. In this method, the nested multi-stage configuration of the MAMuG accelerator can be uniquely designed to satisfy the target voltage within given boundary conditions. The evaluation of the voltage holding capabilities of each acceleration stages was based on the previous experimental results about the area effect and the multi-aperture effect. Since the multi-grid effect was found to be the extension of the area effect by the total facing area this time, the total voltage holding capability of the multi-stage can be estimated from that per single stage by assuming the stage with the highest electric field, the total facing area, and the total apertures. By applying these consideration, the analysis on the 3-stage MAMuG accelerator for JT-60SA agreed well with the past gap-scan experiments with an accuracy of less than 10% variation, which demonstrated the high reliability to design MAMuG accelerators and also multi-stage high voltage bushings.
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Affiliation(s)
- A Kojima
- Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
| | - M Hanada
- Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
| | - H Tobari
- Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
| | - R Nishikiori
- Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
| | - J Hiratsuka
- Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
| | - M Kashiwagi
- Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
| | - N Umeda
- Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
| | - M Yoshida
- Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
| | - M Ichikawa
- Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
| | - K Watanabe
- Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
| | - Y Yamano
- Saitama University, Saitama, Saitama-ken 338-8570, Japan
| | - L R Grisham
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
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Kojima A, Hanada M, Jeong S, Bae Y, Chang D, Kim T, Lee K, Park M, Jung B, Mogaki K, Komata M, Dairaku M, Kashiwagi M, Tobari H, Watanabe K. Demonstration of long-pulse acceleration of high power positive ion beam with JT-60 positive ion source in Japan–Korea joint experiment. Fusion Engineering and Design 2016. [DOI: 10.1016/j.fusengdes.2015.11.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Kojima A, Harada S, Hirano M, Hayashi H, Tamogami H, Iwama K, Kajiwara K, Kozai Y, Kodo H. 303P The diagnostic splenectomy: a review of 12 years' experience of the procedure at our institution. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv526.19] [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: 11/13/2022] Open
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Bai J, Ding W, Kojima A, Seto T, Matsuura H. Putative binding sites for arachidonic acid on the human cardiac Kv 1.5 channel. Br J Pharmacol 2015; 172:5281-92. [PMID: 26292661 PMCID: PMC5341216 DOI: 10.1111/bph.13314] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 08/01/2015] [Accepted: 08/18/2015] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND AND PURPOSE In human heart, the Kv 1.5 channel contributes to repolarization of atrial action potentials. This study examined the electrophysiological and molecular mechanisms underlying arachidonic acid (AA)-induced inhibition of the human Kv 1.5 (hKv 1.5) channel. EXPERIMENTAL APPROACH Site-directed mutagenesis was conducted to mutate amino acids that reside within the pore domain of the hKv 1.5 channel. Whole-cell patch-clamp method was used to record membrane currents through wild type and mutant hKv 1.5 channels heterologously expressed in CHO cells. Computer docking simulation was conducted to predict the putative binding site(s) of AA in an open-state model of the Kv 1.5 channel. KEY RESULTS The hKv 1.5 current was minimally affected at the onset of depolarization but was progressively reduced during depolarization by the presence of AA, suggesting that AA acts as an open-channel blocker. AA itself affected the channel at extracellular sites independently of its metabolites and signalling pathways. The blocking effect of AA was attenuated at pH 8.0 but not at pH 6.4. The blocking action of AA developed rather rapidly by co-expression of Kv β1.3. The AA-induced block was significantly attenuated in H463C, T480A, R487V, I502A, I508A, V512A and V516A, but not in T462C, A501V and L510A mutants of the hKv 1.5 channel. Docking simulation predicted that H463, T480, R487, I508, V512 and V516 are potentially accessible for interaction with AA. CONCLUSIONS AND IMPLICATIONS AA itself interacts with multiple amino acids located in the pore domain of the hKv 1.5 channel. These findings may provide useful information for future development of selective blockers of hKv 1.5 channels.
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Affiliation(s)
- Jia‐Yu Bai
- Department of PhysiologyShiga University of Medical ScienceOtsuJapan
| | - Wei‐Guang Ding
- Department of PhysiologyShiga University of Medical ScienceOtsuJapan
| | - Akiko Kojima
- Department of AnesthesiologyShiga University of Medical ScienceOtsuJapan
| | - Tomoyoshi Seto
- Department of AnesthesiologyShiga University of Medical ScienceOtsuJapan
| | - Hiroshi Matsuura
- Department of PhysiologyShiga University of Medical ScienceOtsuJapan
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Ono M, Kojima A, Shirahashi M, Noda S, Akiba Y, Nishijima S, Amagata T, Ikeda T, Yakubo K, Fukuiya T. Short, severe dizziness attacks in a pregnant woman with type I ARNOLD-Chiari malformation. J OBSTET GYNAECOL 2015; 36:430-1. [PMID: 26467350 DOI: 10.3109/01443615.2015.1090419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- M Ono
- a Department of Obstetrics and Gynaecology , Midori, Saitama , Japan
| | - A Kojima
- b Department of Neurosurgery , Saitama City Hospital , Midori, Saitama , Japan
| | - M Shirahashi
- a Department of Obstetrics and Gynaecology , Midori, Saitama , Japan
| | - S Noda
- a Department of Obstetrics and Gynaecology , Midori, Saitama , Japan
| | - Y Akiba
- a Department of Obstetrics and Gynaecology , Midori, Saitama , Japan
| | - S Nishijima
- a Department of Obstetrics and Gynaecology , Midori, Saitama , Japan
| | - T Amagata
- a Department of Obstetrics and Gynaecology , Midori, Saitama , Japan
| | - T Ikeda
- a Department of Obstetrics and Gynaecology , Midori, Saitama , Japan
| | - K Yakubo
- a Department of Obstetrics and Gynaecology , Midori, Saitama , Japan
| | - T Fukuiya
- a Department of Obstetrics and Gynaecology , Midori, Saitama , Japan
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Kojima A, Ito Y, Ding WG, Kitagawa H, Matsuura H. Interaction of propofol with voltage-gated human Kv1.5 channel through specific amino acids within the pore region. Eur J Pharmacol 2015; 764:622-632. [PMID: 26256861 DOI: 10.1016/j.ejphar.2015.08.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2015] [Accepted: 08/05/2015] [Indexed: 12/25/2022]
Abstract
The intravenous anesthetic propofol affects the function of a diversity of ligand-gated and voltage-gated ion channels. However, there is little information as to whether propofol directly interacts with voltage-gated ion channel proteins to modulate their functions. The Kv1.5 channel is activated by membrane depolarization during action potentials and contributes to atrial repolarization in the human heart. This study was undertaken to examine the effect of propofol on voltage-gated human Kv1.5 (hKv1.5) channel and to elucidate the underlying molecular determinants. Site-directed mutagenesis was carried out through six amino acids that reside within the pore domain of hKv1.5 channel. Whole-cell patch-clamp technique was used to record membrane currents through the wild type and mutant hKv1.5 channels heterologously expressed in Chinese hamster ovary cells. Propofol (≥5 μM) reversibly and concentration-dependently (IC50 of 49.3±9.4 μM; n=6) blocked hKv1.5 current. Propofol-induced block of hKv1.5 current gradually progressed during depolarizing voltage-clamp steps and was enhanced by higher frequency of activation, consistent with a preferential block of the channels in their open state. The degree of current block by propofol was significantly attenuated in T480A, I502A, I508A and V516A, but not in H463C and L510A mutants of hKv1.5 channel. Thus, several amino acids near the selectivity filter (Thr480) or within S6 (Ile502, Ile508 and Val516) are found to be critically involved in the blocking action of propofol. This study provides the first evidence suggesting that direct interaction with specific amino acids underlies the blocking action of propofol on voltage-gated hKv1.5 channel.
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Affiliation(s)
- Akiko Kojima
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga 520-2192, Japan.
| | - Yuki Ito
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga 520-2192, Japan
| | - Wei-Guang Ding
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga 520-2192, Japan
| | - Hirotoshi Kitagawa
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga 520-2192, Japan
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga 520-2192, Japan.
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Kojima A, Kobayashi T, Ito S, Murasawa A, Nakazono K, Yoshie H. Tumor necrosis factor-alpha gene promoter methylation in Japanese adults with chronic periodontitis and rheumatoid arthritis. J Periodontal Res 2015; 51:350-8. [PMID: 26247485 DOI: 10.1111/jre.12314] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/07/2015] [Indexed: 01/29/2023]
Abstract
BACKGROUND AND OBJECTIVE Over-expression of tumor necrosis factor-alpha (TNF-α) plays a pathological role in chronic periodontitis (CP) and rheumatoid arthritis (RA), which might be regulated by the epigenetic mechanism. The aim of the present study was to evaluate whether there is a unique methylation profile of the TNF-α gene promoter in blood cells of individuals with CP and RA. MATERIAL AND METHODS The study participants consisted of 30 Japanese adults with RA (RA group), 30 race-matched adults with CP only (CP group) and 30 race-matched healthy controls (H group). Genomic DNA isolated from peripheral blood was modified by sodium bisulfite and analyzed, by direct sequencing, to investigate DNA methylation of the TNF-α gene promoter region. The level of TNF-α produced in mononuclear cells stimulated with Porphyromonas gingivalis lipopolysaccharide was determined using ELISA. RESULTS Twelve cytosine-guanine dinucleotide (CpG) motifs were identified in the TNF-α promoter fragment from -343 to +57 bp. The CP group showed a significantly higher methylation rate and frequency at -72 bp than the H group (p < 0.01). The RA group exhibited significantly higher methylation rates at seven CpG motifs (-302, -163, -119, -72, -49, -38 and +10 bp), and significantly higher methylation frequencies at six CpG motifs (-163, -119, -72, -49, -38 and +10 bp), than the H group (p < 0.01 for all comparisons). The levels of TNF-α produced were significantly different between individuals with and without methylation at -163 bp (p = 0.03). CONCLUSION These results suggest that the hypermethylated status of CpG motifs in the TNF-α gene promoter in blood cells may be unique to Japanese adults with CP and RA.
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Affiliation(s)
- A Kojima
- Division of Periodontology, Department of Oral Biological Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - T Kobayashi
- Division of Periodontology, Department of Oral Biological Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.,General Dentistry and Clinical Education Unit, Niigata University Medical and Dental Hospital, Niigata, Japan
| | - S Ito
- Niigata Rheumatic Center, Shibata, Japan
| | - A Murasawa
- Niigata Rheumatic Center, Shibata, Japan
| | - K Nakazono
- Niigata Rheumatic Center, Shibata, Japan
| | - H Yoshie
- Division of Periodontology, Department of Oral Biological Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
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Tokuda H, Kuroyanagi G, Tsujimoto M, Enomoto Y, Matsushima-Nishiwaki R, Onuma T, Kojima A, Doi T, Tanabe K, Akamatsu S, Iida H, Ogura S, Otsuka T, Iwama T, Tanikawa T, Ishikawa K, Kojima K, Kozawa O. Release of Phosphorylated HSP27 (HSPB1) from Platelets Is Accompanied with the Acceleration of Aggregation in Diabetic Patients. PLoS One 2015; 10:e0128977. [PMID: 26046355 PMCID: PMC4457785 DOI: 10.1371/journal.pone.0128977] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Accepted: 05/01/2015] [Indexed: 11/18/2022] Open
Abstract
We investigated the relationship between HSP27 phosphorylation and collagen-stimulated activation of platelets in patients with diabetes mellitus (DM). Platelet-rich plasma was prepared from blood of type 2 DM patients. The platelet aggregation was analyzed in size of aggregates by an aggregometer using a laser scattering method. The protein phosphorylation was analyzed by Western blotting. Phosphorylated-HSP27 and PDGF-AB released from platelets were measured by ELISA. The phosphorylated-HSP27 levels at Ser-78 and Ser-82 induced by collagen were directly proportional to the platelet aggregation. Total HSP27 levels in platelets were decreased concomitantly with the phosphorylation. The released HSP27 levels were significantly correlated with the phosphorylated levels of HSP27 in the platelets stimulated by 0.3 μg/ml collagen. The low dose collagen-stimulated release of HSP27 was detected but relatively small in healthy donors. The released levels of PDGF-AB were in parallel with the levels of released HSP27. Area under the curve (AUC) of small aggregation (9-25 μm) induced by 0.3 μg/ml collagen was inversely proportional to the levels of released HSP27. AUC of large aggregation (50-70 μm) was directly proportional to the levels of released HSP27. Exogenous recombinant phosphorylated- HSP27 hardly affected the aggregation or the released levels of PDGF-AB induced by collagen. These results strongly suggest that HSP27 is released from human platelets accompanied with its phosphorylation induced by collagen, which is correlated with the acceleration of platelet aggregation in type 2 DM patients.
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Affiliation(s)
- Haruhiko Tokuda
- Department of Clinical Laboratory, National Center for Geriatrics and Gerontology, Obu, Aichi, Japan
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu, Japan
- * E-mail:
| | - Gen Kuroyanagi
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu, Japan
- Department of Orthopedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Masanori Tsujimoto
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu, Japan
- Department of Neurosurgery, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Yukiko Enomoto
- Department of Neurosurgery, Gifu University Graduate School of Medicine, Gifu, Japan
| | | | - Takashi Onuma
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu, Japan
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Akiko Kojima
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu, Japan
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
- Department of Anesthesiology and Critical Care Medicine, Matsunami General Hospital, Gifu, Japan
| | - Tomoaki Doi
- Department of Emergency and Disaster Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Kumiko Tanabe
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Shigeru Akamatsu
- Department of Anesthesiology and Critical Care Medicine, Matsunami General Hospital, Gifu, Japan
| | - Hiroki Iida
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Shinji Ogura
- Department of Emergency and Disaster Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Takanobu Otsuka
- Department of Orthopedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Toru Iwama
- Department of Neurosurgery, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Takahisa Tanikawa
- Department of Clinical Laboratory, National Center for Geriatrics and Gerontology, Obu, Aichi, Japan
| | - Kei Ishikawa
- Department of Clinical Laboratory, National Center for Geriatrics and Gerontology, Obu, Aichi, Japan
| | - Kumi Kojima
- Department of Clinical Laboratory, National Center for Geriatrics and Gerontology, Obu, Aichi, Japan
| | - Osamu Kozawa
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu, Japan
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Taniguchi Y, Takahashi Y, Toba T, Yamada S, Yokoi K, Kobayashi S, Okajima S, Shimane A, Kawai H, Yasaka Y, Smanio P, Oliveira MA, Machado L, Cestari P, Medeiros E, Fukuzawa S, Okino S, Ikeda A, Maekawa J, Ichikawa S, Kuroiwa N, Yamanaka K, Igarashi A, Inagaki M, Patel K, Mahan M, Ananthasubramaniam K, Mouden M, Yokota S, Ottervanger J, Knollema S, Timmer J, Jager P, Padron K, Peix A, Cabrera L, Pena Bofill V, Valera D, Rodriguez Nande L, Carrillo Hernandez R, Mena Esnard E, Fernandez Columbie Y, Bertella E, Baggiano A, Mushtaq S, Segurini C, Loguercio M, Conte E, Beltrama V, Petulla' M, Andreini D, Pontone G, Guzic Salobir B, Dolenc Novak M, Jug B, Kacjan B, Novak Z, Vrtovec M, Mushtaq S, Pontone G, Bertella E, Conte E, Segurini C, Volpato V, Baggiano A, Formenti A, Pepi M, Andreini D, Ajanovic R, Husic-Selimovic A, Zujovic-Ajanovic A, Mlynarski R, Mlynarska A, Golba K, Sosnowski M, Ameta D, Goyal M, Kumar D, Chandra S, Sethi R, Puri A, Dwivedi SK, Narain VS, Saran RK, Nekolla S, Rischpler C, Nicolosi S, Langwieser N, Dirschinger R, Laugwitz K, Schwaiger M, Goral JL, Napoli J, Forcada P, Zucchiatti N, Damico A, Damico A, Olivieri D, Lavorato M, Dubesarsky E, Montana O, Salgado C, Jimenez-Heffernan A, Ramos-Font C, Lopez-Martin J, Sanchez De Mora E, Lopez-Aguilar R, Manovel A, Martinez A, Rivera F, Soriano E, Maroz-Vadalazhskaya N, Trisvetova E, Vrublevskaya O, Abazid R, Kattea M, Saqqah H, Sayed S, Smettei O, Winther S, Svensson M, Birn H, Jorgensen H, Botker H, Ivarsen P, Bottcher M, Maaniitty T, Stenstrom I, Saraste A, Pikkarainen E, Uusitalo V, Ukkonen H, Kajander S, Bax J, Knuuti J, Choi T, Park H, Lee C, Lee J, Seo Y, Cho Y, Hwang E, Cho D, Sanchez Enrique C, Ferrera C, Olmos C, Jimenez - Ballve A, Perez - Castejon MJ, Fernandez C, Vivas D, Vilacosta I, Nagamachi S, Onizuka H, Nishii R, Mizutani Y, Kitamura K, Lo Presti M, Polizzi V, Pino P, Luzi G, Bellavia D, Fiorilli R, Madeo A, Malouf J, Buffa V, Musumeci F, Rosales S, Puente A, Zafrir N, Shochat T, Mats A, Solodky A, Kornowski R, Lorber A, Boemio A, Pellegrino T, Paolillo S, Piscopo V, Carotenuto R, Russo B, Pellegrino S, De Matteis G, Perrone-Filardi P, Cuocolo A, Piscopo V, Pellegrino T, Boemio A, Carotenuto R, Russo B, Pellegrino S, De Matteis G, Petretta M, Cuocolo A, Amirov N, Ibatullin M, Sadykov A A, Saifullina G, Ruano R, Diego Dominguez M, Rodriguez Gabella T, Diego Nieto A, Diaz Gonzalez L, Garcia-Talavera J, Sanchez Fernandez P, Leen A, Al Younis I, Zandbergen-Harlaar S, Verberne H, Gimelli A, Veltman C, Wolterbeek R, Bax J, Scholte A, Mooney D, Rosenblatt J, Dunn T, Vasaiwala S, Okuda K, Nakajima K, Nystrom K, Edenbrandt L, Matsuo S, Wakabayashi H, Hashimoto M, Kinuya S, Iric-Cupic V, Milanov S, Davidovic G, Zdravkovic V, Ashikaga K, Yoneyama K, Akashi Y, Shugushev Z, Maximkin D, Chepurnoy A, Volkova O, Baranovich V, Faibushevich A, El Tahlawi M, Elmurr A, Alzubaidi S, Sakrana A, Gouda M, El Tahlawi R, Sellem A, Melki S, Elajmi W, Hammami H, Okano M, Kato T, Kimura M, Funasako M, Nakane E, Miyamoto S, Izumi T, Haruna T, Inoko M, Massardo T, Swett E, Fernandez R, Vera V, Zhindon J, Fernandez R, Swett E, Vera V, Zhindon J, Alay R, Massardo T, Ohshima S, Nishio M, Kojima A, Tamai S, Kobayashi T, Murohara T, Burrell S, Van Rosendael A, Van Den Hoogen I, De Graaf M, Roelofs J, Kroft L, Bax J, Scholte A, Rjabceva I, Krumina G, Kalvelis A, Chanakhchyan F, Vakhromeeva M, Kankiya E, Koppes J, Knol R, Wondergem M, Van Der Ploeg T, Van Der Zant F, Lazarenko SV, Bruin VS, Pan XB, Declerck JM, Van Der Zant FM, Knol RJJ, Juarez-Orozco LE, Alexanderson E, Slart R, Tio R, Dierckx R, Zeebregts C, Boersma H, Hillege H, Martinez-Aguilar M, Jordan-Rios A, Christensen TE, Ahtarovski KA, Bang LE, Holmvang L, Soeholm H, Ghotbi AA, Andersson H, Ihlemann N, Kjaer A, Hasbak P, Gulya M, Lishmanov YB, Zavadovskii K, Lebedev D, Stahle M, Hellberg S, Liljenback H, Virta J, Metsala O, Yla-Herttuala S, Saukko P, Knuuti J, Saraste A, Roivainen A, Thackeray J, Wang Y, Bankstahl J, Wollert K, Bengel F, Saushkina Y, Evtushenko V, Minin S, Efimova I, Evtushenko A, Smishlyaev K, Lishmanov Y, Maslov L, Okuda K, Nakajima K, Kirihara Y, Sugino S, Matsuo S, Taki J, Hashimoto M, Kinuya S, Ahmadian A, Berman J, Govender P, Ruberg F, Miller E, Piriou N, Pallardy A, Valette F, Cahouch Z, Mathieu C, Warin-Fresse K, Gueffet J, Serfaty J, Trochu J, Kraeber-Bodere F, Van Dijk J, Mouden M, Ottervanger J, Van Dalen J, Jager P, Zafrir N, Ofrk H, Vaturi M, Shochat T, Hassid Y, Belzer D, Sagie A, Kornowski R, Kaminek M, Metelkova I, Budikova M, Koranda P, Henzlova L, Sovova E, Kincl V, Drozdova A, Jordan M, Shahid F, Teoh Y, Thamen R, Hara N, Onoguchi M, Hojyo O, Kawaguchi Y, Murai M, Udaka F, Matsuzawa Y, Bulugahapitiya DS, Avison M, Martin J, Liu YH, Wu J, Liu C, Sinusas A, Daou D, Sabbah R, Bouladhour H, Coaguila C, Aguade-Bruix S, Pizzi M, Romero-Farina G, Candell-Riera J, Castell-Conesa J, Patchett N, Sverdlov A, Miller E, Daou D, Sabbah R, Bouladhour H, Coaguila C, Smettei O, Abazid R, Boulaamayl El Fatemi S, Sallam L, Snipelisky D, Park J, Ray J, Shapiro B, Kostkiewicz M, Szot W, Holcman K, Lesniak-Sobelga A, Podolec P, Clerc O, Possner M, Liga R, Vontobel J, Mikulicic F, Graeni C, Benz D, Herzog B, Gaemperli O, Kaufmann P. Poster Session 1: Sunday 3 May 2015, 08:30-18:00 * Room: Poster Area. Eur Heart J Cardiovasc Imaging 2015. [DOI: 10.1093/ehjci/jev051] [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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