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Hirata K, Naruse H, Yamamoto Y, Hatanaka K, Kinoshita K, Abiko S, Suzuki K, Nakajima K, Katagiri M, Takano M, Ozasa M, Umemura M, Nakajima S, Aoyama K, Sasaki T, Kuwatani M, Sakamoto N, Tanikawa S, Okazaki N, Tanaka S. Gastrointestinal: Rare malignant biliary stricture with rapid progression. J Gastroenterol Hepatol 2022; 37:1839. [PMID: 35307882 DOI: 10.1111/jgh.15802] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 12/21/2021] [Accepted: 01/12/2022] [Indexed: 12/09/2022]
Affiliation(s)
- K Hirata
- Department of Gastroenterology, Hakodate Municipal Hospital, Hakodate, Japan
| | - H Naruse
- Department of Gastroenterology, Hakodate Municipal Hospital, Hakodate, Japan
| | - Y Yamamoto
- Department of Gastroenterology, Hakodate Municipal Hospital, Hakodate, Japan
| | - K Hatanaka
- Department of Gastroenterology, Hakodate Municipal Hospital, Hakodate, Japan
| | - K Kinoshita
- Department of Gastroenterology, Hakodate Municipal Hospital, Hakodate, Japan
| | - S Abiko
- Department of Gastroenterology, Hakodate Municipal Hospital, Hakodate, Japan
| | - K Suzuki
- Department of Gastroenterology, Hakodate Municipal Hospital, Hakodate, Japan
| | - K Nakajima
- Department of Gastroenterology, Hakodate Municipal Hospital, Hakodate, Japan
| | - M Katagiri
- Department of Gastroenterology, Sapporo Hokuyu Hospital, Sapporo, Japan
| | - M Takano
- Department of Gastroenterology, Sapporo Hokuyu Hospital, Sapporo, Japan
| | - M Ozasa
- Department of Gastroenterology, Sapporo Hokuyu Hospital, Sapporo, Japan
| | - M Umemura
- Department of Gastroenterology, Sapporo Hokuyu Hospital, Sapporo, Japan
| | - S Nakajima
- Department of Gastroenterology, Sapporo Hokuyu Hospital, Sapporo, Japan
| | - K Aoyama
- Department of Gastroenterology, Sapporo Hokuyu Hospital, Sapporo, Japan
| | - T Sasaki
- Department of Gastroenterology, Sapporo Hokuyu Hospital, Sapporo, Japan
| | - M Kuwatani
- Department of Gastroenterology and Hepatology, Hokkaido University Faculty of Medicine and Graduate School of Medicine, Sapporo, Japan
| | - N Sakamoto
- Department of Gastroenterology and Hepatology, Hokkaido University Faculty of Medicine and Graduate School of Medicine, Sapporo, Japan
| | - S Tanikawa
- Department of Cancer Pathology, Hokkaido University Faculty of Medicine, Sapporo, Japan
| | - N Okazaki
- Department of Cancer Pathology, Hokkaido University Faculty of Medicine, Sapporo, Japan
| | - S Tanaka
- Department of Cancer Pathology, Hokkaido University Faculty of Medicine, Sapporo, Japan
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Ichibayashi R, Suzuki G, Nakamichi Y, Masuyama Y, Yamamoto S, Serizawa H, Watanabe M, Aoyama K, Honda M. Management of organic phosphorus poisoning using a pupillometer: a case report. QJM 2022; 115:415-416. [PMID: 35238387 DOI: 10.1093/qjmed/hcac063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Indexed: 11/12/2022] Open
Affiliation(s)
- R Ichibayashi
- From the Department of Critical Care Center, Toho University Medical Center, Omori Hospital, 6-11-1 Omori-Nishi, Ota-ku, Tokyo 143-8541, Japan
| | - G Suzuki
- From the Department of Critical Care Center , Toho University Medical Center, Omori Hospital, 6-11-1 Omori-Nishi, Ota-ku, Tokyo 143-8541, Japan
| | - Y Nakamichi
- From the Department of Critical Care Center, Toho University Medical Center, Omori Hospital, 6-11-1 Omori-Nishi , Ota-ku, Tokyo 143-8541, Japan
| | - Y Masuyama
- From the Department of Critical Care Center, Toho University Medical Center, Omori Hospital, 6-11-1 Omori-Nishi, Ota-ku, Tokyo 143-8541 , Japan
| | - S Yamamoto
- From the Department of Critical Care Center, Toho University Medical Center, Omori Hospital, 6-11-1 Omori-Nishi, Ota-ku, Tokyo 143-8541, Japan
| | - H Serizawa
- From the Department of Critical Care Center, Toho University Medical Center, Omori Hospital, 6-11-1 Omori-Nishi, Ota-ku, Tokyo 143-8541, Japan
| | - M Watanabe
- From the Department of Critical Care Center, Toho University Medical Center, Omori Hospital, 6-11-1 Omori-Nishi, Ota-ku, Tokyo 143-8541, Japan
| | - K Aoyama
- Department of Pharmacy, Toho University Medical Center, Omori Hospital, 6-11-1 Omori-Nishi, Ota-ku, Tokyo 143-8541, Japan
| | - M Honda
- From the Department of Critical Care Center, Toho University Medical Center, Omori Hospital, 6-11-1 Omori-Nishi, Ota-ku, Tokyo 143-8541, Japan
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Aoyama K, Kawamura H. Spin Current as a Probe of the Z_{2}-Vortex Topological Transition in the Classical Heisenberg Antiferromagnet on the Triangular Lattice. Phys Rev Lett 2020; 124:047202. [PMID: 32058748 DOI: 10.1103/physrevlett.124.047202] [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: 09/18/2019] [Indexed: 06/10/2023]
Abstract
We have theoretically investigated transport properties of the classical Heisenberg antiferromagnet on the triangular lattice, in which a binding-unbinding topological transition of Z_{2} vortices is predicted to occur at a finite temperature T_{v}. It is shown by means of the hybrid Monte Carlo and spin-dynamics simulations that the longitudinal spin-current conductivity exhibits a divergence at T_{v}, while the thermal conductivity only shows a monotonic temperature dependence with no clear anomaly at T_{v}. The significant enhancement of the spin-current conductivity is found to be due to the rapid growth of the spin-current-relaxation time toward T_{v}, which can be understood as a manifestation of the topological nature of the free Z_{2} vortex whose lifetime gets longer toward T_{v}. The result suggests that the spin-current measurement is a promising probe to detect the Z_{2}-vortex topological transition, which has remained elusive in experiments.
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Affiliation(s)
- K Aoyama
- Department of Earth and Space Science, Graduate School of Science, Osaka University, Osaka 560-0043, Japan
| | - H Kawamura
- Department of Earth and Space Science, Graduate School of Science, Osaka University, Osaka 560-0043, Japan
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Campbell HM, Armstrong JF, Aoyama K, Biselli S, Cea J, de Rijk T, Dmytrow H, Dömsödi J, Friis-Wandall S, Gonzalez; P, Inerowicz D, Kirby P, Kozak A, Marley E, Marth-Schill J, Nordkvist E, Renaud S, Riter K, Roos A. Determination of Zearalenone in Cereal Grains, Animal Feed, and Feed Ingredients Using Immunoaffinity Column Chromatography and Liquid Chromatography: Interlaboratory Study. J AOAC Int 2019. [DOI: 10.1093/jaoac/90.6.1610] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
A method using immunoaffinity column chromatography (IAC) and liquid chromatography (LC) for determination of zearalenone in cereal grains, animal feed, and feed ingredients was collaboratively studied. The test portion is extracted by shaking with acetonitrilewater (90 + 10, v/v) and sodium chloride. The extract is diluted and applied to an immunoaffinity column, the column is washed with water or phosphatebuffered saline or methanolwater (30 + 70, v/v), and zearalenone is eluted with methanol. The eluate is evaporated, the residue is dissolved in mobile phase and analyzed by reversed-phase LC with fluorescence detection. The presence of zearalenone can be confirmed using an alternate excitation wavelength or diode array detection. Twenty samples were sent to 13 collaborators (8 in Europe, 2 in the United States, one in Japan, one in Uruguay, and one in Canada). Eighteen samples of naturally contaminated corn, barley, wheat, dried distillers grains, swine feed, and dairy feed were analyzed as blind duplicates, along with blank corn and wheat samples. The analyses were done in 2 sample sets with inclusion of a spiked wheat control sample (0.1 mg/kg) in each set. Spiked samples recoveries were 89116, and for the 18 naturally contaminated samples, RSDr values (within-laboratory repeatability) ranged from 6.67 to 12.1, RSDR values (among-laboratory reproducibility) ranged from 12.5 to 19.7, and HorRat values ranged from 0.61 to 0.90.
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Affiliation(s)
- Harold M Campbell
- Canadian Food Inspection Agency, Ottawa Laboratory (Carling), Ottawa, ON, Canada K1A 0C6
| | - J Fred Armstrong
- Canadian Food Inspection Agency, Ottawa Laboratory (Carling), Ottawa, ON, Canada K1A 0C6
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Kusunoki Y, Aoyama K, Furukawa S, Shida H, Iwasaki S, Tsuji T, Fukasawa Y, Horita T, Jodo S. 024. A CASE OF CHOLESTEROL EMBOLIZATION SYNDROME WITH POSITIVITY OF MPO-ANCA. Rheumatology (Oxford) 2019. [DOI: 10.1093/rheumatology/kez057.023] [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] Open
Affiliation(s)
- Yoshihiro Kusunoki
- Center for Nephrology and Rheumatology, Japan Community Health Care Organization (JCHO) Hokkaido Hospital, Sapporo, Hokkaido, Japan
| | - Keiya Aoyama
- Center for Nephrology and Rheumatology, Japan Community Health Care Organization (JCHO) Hokkaido Hospital, Sapporo, Hokkaido, Japan
| | - Shota Furukawa
- Center for Nephrology and Rheumatology, Japan Community Health Care Organization (JCHO) Hokkaido Hospital, Sapporo, Hokkaido, Japan
| | - Haruki Shida
- Center for Nephrology and Rheumatology, Japan Community Health Care Organization (JCHO) Hokkaido Hospital, Sapporo, Hokkaido, Japan
| | - Sari Iwasaki
- Department of Pathology, Sapporo City General Hospital, Sapporo, Hokkaido, Japan
| | - Takahiro Tsuji
- Department of Pathology, Sapporo City General Hospital, Sapporo, Hokkaido, Japan
| | - Yuichiro Fukasawa
- Department of Pathology, Sapporo City General Hospital, Sapporo, Hokkaido, Japan
| | - Tetsuya Horita
- Department of Internal Medicine, Tomakomai City Hospital, Sapporo, Hokkaido, Japan
| | - Satoshi Jodo
- Center for Nephrology and Rheumatology, Japan Community Health Care Organization (JCHO) Hokkaido Hospital, Sapporo, Hokkaido, Japan
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6
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Chikaraishi H, Inoue T, Takami T, Aoyama K, Haga T. DC Power Supplies for LHD Superconducting Magnets and Their Enhancement for Dynamic Control of the Magnetic Field. Fusion Science and Technology 2017. [DOI: 10.13182/fst10-a10846] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [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)
- H. Chikaraishi
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Inoue
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Takami
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Aoyama
- Aichi Electric Co., Ltd., Kasugai 486-8666, Japan
| | - T. Haga
- Asort Co., Ltd., Akashi 673-011, Japan
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Wada T, Saito H, Aoyama K, Saito S, Shibukawa M. Development and inter-laboratory study of a method for quantifying ochratoxin A in pet foods. WORLD MYCOTOXIN J 2017. [DOI: 10.3920/wmj2015.1953] [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] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
An analytical method for quantifying ochratoxin A (OTA) in pet foods using high-performance liquid chromatography was developed, and an inter-laboratory study was conducted. OTA was extracted from samples with aqueous acetonitrile. The extract was purified by an immunoaffinity column, OCHRAKING, and analysed by high performance liquid chromatography with fluorescence detection. The limits of quantification by this method were 2 µg/kg for dry and semidry pet food and 1 µg/kg for wet type pet food. The calibration curve showed linearity in the range of 0.5-50 ng/ml (equivalent to 1-100 µg/kg for wet type pet food). The mean recoveries of OTA spiked at 1-5 µg/kg were in the range of 83.0-106% and relative standard deviations of the in-house method validation were 2.6-6.8%. The mean recoveries, repeatability, reproducibility and the Horwitz ratios for OTA from the inter-laboratory validation study were 75.6-83.1%, 3.5-6.1%, 5.0-15.0% and 0.23-0.68, respectively.
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Affiliation(s)
- T. Wada
- Chemicals Evaluation and Research Institute Japan (CERI), CERI Tokyo, Environmental Technology Department, 1600, Shimotakano, Sugito-machi, Kitakatsushika-gun, Saitama 345-0043, Japan
- Graduate School of Science and Engineering, Saitama University 255, Shimo-Okubo, Sakura, Saitama 338-8570, Japan
| | - H. Saito
- Food and Agricultural Materials Inspection Center (FAMIC) Fertilizer and Feed Inspection Department, Saitama Shintoshin National Government Building, Kensato Building 2-1, Shintoshin, Chuo-ku, Saitama-shi, Saitama 330-9731, Japan
| | - K. Aoyama
- Food and Agricultural Materials Inspection Center (FAMIC) Fertilizer and Feed Inspection Department, Saitama Shintoshin National Government Building, Kensato Building 2-1, Shintoshin, Chuo-ku, Saitama-shi, Saitama 330-9731, Japan
| | - S. Saito
- Graduate School of Science and Engineering, Saitama University 255, Shimo-Okubo, Sakura, Saitama 338-8570, Japan
| | - M. Shibukawa
- Graduate School of Science and Engineering, Saitama University 255, Shimo-Okubo, Sakura, Saitama 338-8570, Japan
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Sashida G, Wang C, Aoyama K, Oshima M, Tomioka T, Yui M, Mochizuki-Kashio M, Iwama A. 177 EZH2 LOSS PROMOTES THE FORMATION OF MYELOFIBROSIS ACCOMPANIED WITH IMPAIRED ERYTHROPOIESIS. Leuk Res 2015. [DOI: 10.1016/s0145-2126(15)30178-8] [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: 11/27/2022]
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Hashiba H, Takiguchi R, Jyoho K, Aoyama K. Establishment of a Host-vector System in Lactobacillus helveticus with β-Galactosidase Activity as a Selection Marker. Biosci Biotechnol Biochem 2014; 56:190-4. [PMID: 1368295 DOI: 10.1271/bbb.56.190] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A host-vector system was established in Lactobacillus helveticus with beta-galactosidase activity as a selection marker. Plasmid pBG10 was constructed by joining the beta-galactosidase gene from L. bulgaricus, the promoter region of the erythromycin resistance gene from pAM beta 1, the replication region of pBR329, and the replication region of the L. helveticus cryptic plasmid pLJ1. L. helveticus SBT2195 (Lac- mutant), transformed with pBG10, was selected on skim milk plates. The structural gene of alpha-amylase (1536 bp) from Bacillus licheniformis, inserted downstream of the promoter region of the erythromycin resistance gene of pBG10, was expressed in L. helveticus SBT2195. Plasmid pBG10 is a food-grade and expression vector in L. helveticus.
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Affiliation(s)
- H Hashiba
- Technical Research Institute, Snow Brand Milk Products Co., Ltd., Saitama, Japan
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Kisohara A, Kann S, Tagawa K, Aoyama K. Refusal of Chemotherapy: Adequacy of Decision Making by Patients. Ann Oncol 2013. [DOI: 10.1093/annonc/mdt460.6] [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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Aoyama K, Barnes J, Grimm JW. Incubation of saccharin craving and within-session changes in responding for a cue previously associated with saccharin. Appetite 2013; 72:114-22. [PMID: 24161592 DOI: 10.1016/j.appet.2013.10.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [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: 06/11/2013] [Revised: 09/26/2013] [Accepted: 10/05/2013] [Indexed: 12/25/2022]
Abstract
Time-dependent increases in cue-induced sucrose seeking after forced abstinence have been described in rats with a history of sucrose self-administration, suggesting sucrose craving "incubates". In the present study, we examined whether the incubation of craving generalizes to the artificial sweetener, saccharin. Thirty-one male Long-Evans rats lever pressed for 0.3% saccharin solution 1h/day for 10 days. On either Day 1 or 30 of forced abstinence, rats responded for 1h for presentation of a tone+light cue previously presented with every saccharin delivery during self-administration training. Rats responded more during this cue-reactivity test session following 30 vs. 1 day of forced abstinence ("incubation of craving"). This result is the first demonstration of the "incubation of saccharin craving" and suggests that a post-ingestive caloric consequence of self-administration is not a necessary condition for the development of incubation of sucrose craving. We also examined the time course (within-session decreases) of active-lever responding during the 1-h cue-reactivity test session. Rats in the Day 30 group responded more than rats in the Day 1 group from the beginning of the test session. In addition, within-session decreases in responding were shallower in slope in the Day 30 than the Day 1 group. These results indicate that "incubation of saccharin craving" enhances the persistence of seeking behavior.
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Affiliation(s)
- K Aoyama
- Department of Psychology, Doshisha University, Kyotanabe-shi, Kyoto 610-0394, Japan.
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Isaev L, Aoyama K, Paul I, Vekhter I. Orbital order and Hund's rule frustration in Kondo lattices. Phys Rev Lett 2013; 111:157202. [PMID: 24160623 DOI: 10.1103/physrevlett.111.157202] [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: 08/08/2013] [Indexed: 06/02/2023]
Abstract
We analyze a microscopic origin of the Kondo effect-assisted orbital order in heavy-fermion materials. By studying the periodic two-orbital Anderson model with two local electrons, we show that frustration of Hund's rule coupling due to the Kondo effect leads to an incommensurate spiral orbital and magnetic order, which exists only inside the Kondo screened (heavy-electron) phase. This spiral state can be observed in neutron and resonant x-ray scattering measurements in U- and Pr-based heavy-fermion compounds, and realized in cold atomic gases, e.g., fermionic 173Yb.
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Affiliation(s)
- L Isaev
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 80703, USA
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13
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Koyama M, Hashimoto D, Nagafuji K, Eto T, Ohno Y, Aoyama K, Iwasaki H, Miyamoto T, Hill GR, Akashi K, Teshima T. Expansion of donor-reactive host T cells in primary graft failure after allogeneic hematopoietic SCT following reduced-intensity conditioning. Bone Marrow Transplant 2013; 49:110-5. [PMID: 24013691 DOI: 10.1038/bmt.2013.134] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Revised: 07/02/2013] [Accepted: 07/22/2013] [Indexed: 11/09/2022]
Abstract
Graft rejection remains a major obstacle in allogeneic hematopoietic SCT following reduced-intensity conditioning (RIC-SCT), particularly after cord blood transplantation (CBT). In a murine MHC-mismatched model of RIC-SCT, primary graft rejection was associated with activation and expansion of donor-reactive host T cells in peripheral blood and BM early after SCT. Donor-derived dendritic cells are at least partly involved in host T-cell activation. We then evaluated if such an expansion of host T cells could be associated with graft rejection after RIC-CBT. Expansion of residual host lymphocytes was observed in 4/7 patients with graft rejection at 3 weeks after CBT, but in none of the 17 patients who achieved engraftment. These results suggest the crucial role of residual host T cells after RIC-SCT in graft rejection and expansion of host T cells could be a marker of graft rejection. Development of more efficient T cell-suppressive conditioning regimens may be necessary in the context of RIC-SCT.
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Affiliation(s)
- M Koyama
- 1] Department of Medicine and Biosystemic Science, Kyushu University Graduate School of Medical Science, Fukuoka, Japan [2] Bone Marrow Transplantation Laboratory, Queensland Institute of Medical Research, Brisbane, Queensland, Australia
| | - D Hashimoto
- Department of Hematology, Hokkaido University Graduate School of Medical Science, Sapporo, Japan
| | - K Nagafuji
- Department of Hematology, Kurume University, Fukuoka, Japan
| | - T Eto
- Department of Hematology, Hamanomachi General Hospital, Fukuoka, Japan
| | - Y Ohno
- Internal medicine, Kitakyushu Municipal Medical Center, Kitakyushu, Japan
| | - K Aoyama
- Department of Medicine and Biosystemic Science, Kyushu University Graduate School of Medical Science, Fukuoka, Japan
| | - H Iwasaki
- Center for Cellular and Molecular Medicine, Kyushu University Graduate School of Medical Science, Fukuoka, Japan
| | - T Miyamoto
- Department of Medicine and Biosystemic Science, Kyushu University Graduate School of Medical Science, Fukuoka, Japan
| | - G R Hill
- Bone Marrow Transplantation Laboratory, Queensland Institute of Medical Research, Brisbane, Queensland, Australia
| | - K Akashi
- 1] Department of Medicine and Biosystemic Science, Kyushu University Graduate School of Medical Science, Fukuoka, Japan [2] Center for Cellular and Molecular Medicine, Kyushu University Graduate School of Medical Science, Fukuoka, Japan
| | - T Teshima
- Department of Hematology, Hokkaido University Graduate School of Medical Science, Sapporo, Japan
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Aoyama K, Beaird R, Sheehy DE, Vekhter I. Inhomogeneous superconducting States of mesoscopic thin-walled cylinders in external magnetic fields. Phys Rev Lett 2013; 110:177004. [PMID: 23679762 DOI: 10.1103/physrevlett.110.177004] [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: 11/29/2012] [Indexed: 06/02/2023]
Abstract
We theoretically investigate the appearance of spatially modulated superconducting states in mesoscopic superconducting thin-wall cylinders in a magnetic field at low temperatures. Quantization of the electron motion around the circumference of the cylinder leads to a discontinuous evolution of the spatial modulation of the superconducting order parameter along the transition line T(c)(H). We show that this discontinuity leads to the nonmonotonic behavior of the specific heat jump at the onset of superconductivity as a function of temperature and field. We argue that this geometry provides an excellent opportunity to directly and unambiguously detect distinctive signatures of the Fulde-Ferrell-Larkin-Ovchinnikov modulation of the superconducting order.
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Affiliation(s)
- K Aoyama
- The Hakubi Center for Advanced Research, Kyoto University, Kyoto 606-8501, Japan
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Inomata T, Triadan D, Aoyama K, Castillo V, Yonenobu H. Early Ceremonial Constructions at Ceibal, Guatemala, and the Origins of Lowland Maya Civilization. Science 2013; 340:467-71. [DOI: 10.1126/science.1234493] [Citation(s) in RCA: 105] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Suzuki E, Aoyama K, Fukui T, Nakamura Y, Yamane A. The function of platelet-derived growth factor in the differentiation of mouse tongue striated muscle. Orthod Craniofac Res 2012; 15:39-51. [PMID: 22264326 DOI: 10.1111/j.1601-6343.2011.01535.x] [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] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To determine the function of platelet-derived growth factor (PDGF) in the final differentiation phase of tongue striated muscle cells. MATERIALS AND METHODS We analyzed the expressions of PDGF-A, -B, platelet-derived growth factor receptor (PDGFR)-α, and PDGFR-β in mouse tongues between embryonic days (E) 11 and 15. Furthermore, we examined the effects of human recombinant PDGF-AB and the peptide antagonist for PDGFRs using an organ culture system of mouse embryonic tongue. Mouse tongues at E12 were cultured in BGJb medium containing human recombinant PDGF-AB for 4 days or the peptide antagonist for PDGF receptors for 8 days. RESULTS PDGF-A, -B, PDGFR-α, and -β were expressed in the differentiating muscle cells between E11 and 15. The human recombinant PDGF-AB induced increases in the mRNA expressions of myogenin and muscle creatine kinase (MCK) and the number of fast myosin heavy chain (fMHC)-positive cells, markers for the differentiation of muscle cells. On the other hand, the peptide antagonist for PDGFRs induced suppressions in the mRNA expressions of myogenin and MCK, and the number of fMHC-positive cells. Both the PDGF-AB and the antagonist failed to affect the expressions of cell proliferation markers. CONCLUSION These results suggest that PDGF functions as a positive regulator in the final differentiation phase of tongue muscle cells in mouse embryos.
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Affiliation(s)
- E Suzuki
- Department of Orthodontics, Tsurumi University School of Dental Medicine, Tsurumi-ku, Yokohama, Japan
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Matsubara Y, Endo K, Iguchi M, Ito N, Aoyama K, Tatsumj T, Horiuchi T. Copper damascene using low dielectric constant fluorinated amorphous carbon interlayer. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-511-291] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTWe have developed a new interconnect technique using a low-k (εt,=2.5) organic interlayer (fluorinated amorphous carbon: a-C:F) and a low-resistivity metal line (copper). The new technique attains a duction in both the capacitance of the interlayer and the resistance of the metal line. We found that a-C:F on Cu reduces reflection to 10% for Kr-F line lithography. However, a-C:F cannot act as a protection layer for oxidation even at 200°C in atmospheric ambient annealing. Cu diffusion into a-C:F is about 100 nm at the annealing temperature of 450°C. The resistivity of the Cu line is 2.3–2.4 μΩ · cm for the 0.5-μm line width. Although the leakage current of the a-C:F ILD is one order higher than that of the SiO2 ILD, electrical isolation is acceptable at < 20 V when annealing is carried out at 350°C in a vacuum.
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Abstract
Slope (or plate) cultures of thiostrepton-producing Streptomyces azureus (ATCC 14921) often showed spontaneously developing plaques. Plaques increased in number during serial subcultures. The production of aerial mycelia and sporulating aerial hyphae was interrupted by the overlapping plaques, whereas the growth of substrate mycelia continued in the plaques. These abnormal (eroded) cultures were easily restored to their normal conditions once they were passed through liquid cultures under shaking conditions. A few phage particles were found in the plaques, together with some headless tails and numerous tail tips which formed a hexagonal crystal or a large crystal mass when viewed in an electron microscope. No lytic phenomenon and no phage production were found in the liquid cultures, although all mycelia and spores harbored phage-producing abilities. It was also found that the propagation of phages was successful in solid culture, but not in liquid culture. The whole phage was named SAt2, which belongs to group B of Bradley's morphological classification. From these results, it is considered that S. azureus is lysogenic with temperate phage SAt2, of which virulent mutants are able to infect the aerial mycelia and sporulating hyphae of their lysogenic host.
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Affiliation(s)
- S Ogata
- Laboratory of Applied Microbiology, Department of Agricultural Chemistry, Kyushu University, Fukuoka, 812, Japan
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Zaki SM, Ibrahim N, Aoyama K, Shetaia YM, Abdel-Ghany K, Mikami Y. Dermatophyte infections in Cairo, Egypt. Mycopathologia 2008; 167:133-7. [PMID: 18972221 DOI: 10.1007/s11046-008-9165-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2008] [Accepted: 10/14/2008] [Indexed: 11/30/2022]
Abstract
In this study, we examined dermatophyte infections in patients referred to the Department of Dermatology, EL-Houd El-Marsoud Hospital, Cairo, during March 2004 to June 2005. Of 506 patients enrolled in this investigation, 403 (79.6%) were clinically diagnosed as having dermatophytoses (age range 6-70 years; males 240; females 163). Species identification determined by observation of their macroscopic and microscopic characteristics was complemented with sequencing of the internal transcribed spacer ITS1-5.8S-ITS2 rDNA region. The most common dermatophyte infection diagnosed was tinea capitis (76.4%), followed by tinea corporis (22.3%) and tinea unguium (1.2%). The most frequently isolated dermatophyte species was Trichophyton violaceum, which accounted for most (71.1%) of all the recovered dermatophytes, followed by Microsporum canis (21.09%), Trichophyton rubrum (6.2%), and Microsporum boullardii (0.49%); both Epidermophyton floccosum and Trichophyton tonsurans were each only rarely isolated (0.24%).
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Affiliation(s)
- S M Zaki
- Microbiology Department, Faculty of Science, Ain Shams University, Abbassia 11566, Cairo, Egypt.
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Aoyama K. Effects of irregularity and predictability of the time of daily sessions on rats’ feeding behavior. Appetite 2008. [DOI: 10.1016/j.appet.2008.04.028] [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: 10/22/2022]
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Takaki Y, Aoyama K. Effect of pace of eating on within-session decreases in human eating behavior by instructing participants to chew each mouthful over 30 times. Appetite 2008. [DOI: 10.1016/j.appet.2008.04.236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Kumagai S, Nakajima M, Tabata S, Ishikuro E, Tanaka T, Norizuki H, Itoh Y, Aoyama K, Fujita K, Kai S, Sato T, Saito S, Yoshiike N, Sugita-Konishi Y. Aflatoxin and ochratoxin A contamination of retail foods and intake of these mycotoxins in Japan. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2008; 25:1101-6. [DOI: 10.1080/02652030802226187] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Aoyama K. [Leprosy patient comprehension using a perspective model and KOMI chart--clinical case conference]. Nihon Hansenbyo Gakkai Zasshi 2008; 77:49-56. [PMID: 18341025 DOI: 10.5025/hansen.77.49] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
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Hashimoto D, Asakura S, Matsuoka KI, Sakoda Y, Koyama M, Aoyama K, Tanimoto M, Teshima T. 298: Alloantigens expression on host non-hematopoietic cells leads to donor T cell exhaustion and reduces GVL effects. Biol Blood Marrow Transplant 2007. [DOI: 10.1016/j.bbmt.2006.12.303] [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: 11/26/2022]
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Koyama M, Hashimoto D, Kamezaki K, Numata A, Sakoda Y, Aoyama K, Takenaka K, Miyamoto T, Harada N, Nagafuji K, Akashi K, Tanimoto M, Harada M, Teshima T. 351: Early recovery of host T cells predicts primary graft rejection following non-myeloablative conditioning allogeneic hematopoietic stem cell transplantation. Biol Blood Marrow Transplant 2007. [DOI: 10.1016/j.bbmt.2006.12.356] [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: 11/26/2022]
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Nunomiya T, Abe S, Aoyama K, Nakamura T. Development of advanced-type multi-functional electronic personal dosemeter. Radiat Prot Dosimetry 2007; 126:284-7. [PMID: 17704353 DOI: 10.1093/rpd/ncm059] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
An advanced-type small, light, multi-functional electronic personal dosemeter has been developed using silicon semiconductor radiation detectors for dose management of workers at nuclear power plants and accelerator facilities. This dosemeter is 62 x 82 x 27 mm(3) in size and approximately 130 g in weight, which is capable of measuring personal gamma ray and neutron dose equivalents, Hp(10), simultaneously. The neutron dose equivalent can be obtained using two types of silicon semiconductors: a slow-neutron sensor (<1 MeV) and a fast-neutron sensor (>1 MeV). The slow neutron sensor is a 10 x 10 mm(2) p-type silicon on which a natural boron layer is deposited around an aluminium electrode. The fast neutron sensor is also a 10 x 10 mm(2) p-type silicon crystal on which an amorphous silicon hydride is deposited. The neutron energy response corresponding to the fluence-to-dose-equivalent conversion coefficient given by ICRP Publication 74 has been evaluated using a monoenergetic neutron source from 250 keV to 15 MeV at the Fast Neutron Laboratory of Tohoku University. As the result, the Hp(10) response to neutrons in the energy range of 250 keV and 4.4 MeV within +/-50% difference has been obtained.
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Affiliation(s)
- T Nunomiya
- Fuji Electric Systems Co., Ltd. Fuji-machi, Hino, Tokyo, Japan.
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Tsujimura N, Yoshida T, Takada C, Momose T, Nunomiya T, Aoyama K. Development of a neutron personal dose equivalent detector. Radiat Prot Dosimetry 2007; 126:261-4. [PMID: 17545659 DOI: 10.1093/rpd/ncm054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
A new neutron-measuring instrument that is intended to measure a neutron personal dose equivalent, H(p)(10) was developed. This instrument is composed of two parts: (1) a conventional moderator-based neutron dose equivalent meter and (2) a neutron shield made of borated polyethylene, which covers a backward hemisphere to adjust the angular dependence. The whole design was determined on the basis of MCNP calculations so as to have response characteristics that would generally match both the energy and angular dependencies of H(p)(10). This new instrument will be a great help in assessing the reference values of neutron H(p)(10) during field testing of personal neutron dosemeters in workplaces and also in interpreting their readings.
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Affiliation(s)
- N Tsujimura
- Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency, 4-33, Tokai-mura, Ibaraki-ken 319-1194, Japan.
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Takenaka I, Aoyama K, Iwagaki T, Ishimura H, Kadoya T. Development of torsade de pointes caused by exacerbation of QT prolongation during clipping of cerebral artery aneurysm in a patient with subarachnoid haemorrhage. Br J Anaesth 2006; 97:533-5. [PMID: 16849385 DOI: 10.1093/bja/ael183] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
We report the case of a 79-yr-old woman with subarachnoid haemorrhage (SAH) in whom torsade de pointes (TdP) caused by worsening the QT prolongation occurred during clipping of cerebral artery aneurysm. This patient shows a potential risk of occurrence of life-threatening tachyarrhythmia, TdP by prolonging the QT interval during surgery in patients with SAH even with no additional factors that predispose to TdP. Therefore, a proper monitoring of the QT interval is necessary as a predictor of TdP. When ventricular tachyarrhythmia occurs, recognition of TdP is important because antiarrhythmic drug therapy for TdP is different from that for ventricular tachyarrhythmias that is not TdP.
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Affiliation(s)
- I Takenaka
- Department of Anaesthesia, Nippon Steel Yawata Memorial Hospital, 1-1-1 Harunomachi, Yahatahigashi-ku, Kitakyushu 805-8508, Japan.
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Nozawa K, Ozaki Y, Guto S, Nakanishi T, Aoyama K, Ogasawara MS. 1141478081 Cleavage of integrin by calpain in patients with recurrent miscarriage. Am J Reprod Immunol 2006. [DOI: 10.1111/j.1600-0897.2006.00383_28.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Abstract
Signal transducer and activator of transcription 3 (STAT3), which mediates biological actions in many physiological processes, is activated by cytokines and growth factors, and has been reported to be constitutively activated in numerous cancer cells. In this study, we examined whether low molecular weight-dual specificity phosphatase two (LMW-DSP2) is involved in the regulation of the interleukin 6 (IL-6)/leukemia inhibitory factor (LIF)/STAT3-mediated signaling pathway. IL-6/LIF-induced LMW-DSP2 expression in murine testicular or hepatoma cell lines, while LMW-DSP2 overexpression in 293T cells suppressed IL-6-induced phosphorylation and activation of STAT3. Furthermore, LMW-DSP2 suppressed the expression of IL-6-induced endogenous genes. In contrast, small-interfering RNA-mediated reduction of LMW-DSP2 expression enhanced IL-6-induced STAT3-dependent transcription. In fact, LMW-DSP2 interacted with STAT3 in vivo and endogenous LMW-DSP2 bound to STAT3 in murine testicular GC-1 cells. These results strongly suggest that LMW-DSP2 acts as a negative regulator of the IL-6/LIF/STAT3-mediated signaling pathway.
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Affiliation(s)
- Y Sekine
- Department of Immunology, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan
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Abstract
Progressive supranuclear palsy (PSP) is a neurodegenerative disorder, which may possibly be induced by oxidative stress. However, the age-related alteration of the endogenous antioxidant system is not well understood. To better understand this, we measured Cu/Zn-superoxide dismutase (SOD), glutathione peroxidase (GPx), and 4-hydroxynonenal (HNE)-conjugated GPx in cerebrospinal fluid of PSP patients by enzyme linked immunosorbent assay. A significant increase in the Cu/Zn-SOD level was detected in PSP group compared with controls. The levels of Cu/Zn-SOD and GPx in PSP group showed positive correlations with age. Two-thirds of total GPx was present as the HNE-conjugated form with positive correlation in PSP group. In conclusion, the endogenous antioxidant system of PSP patients appears to be activated with aging, however, it might be unable to function effectively because of conjugation with HNE.
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Affiliation(s)
- K Aoyama
- Department of Internal Medicine III, School of Medicine, Shimane University, Izumo, Japan.
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Abstract
In gastroschisis, the opening is almost always to the right of the umbilicus, although eight cases of left-sided gastroschisis have been reported in the literature. We encountered two additional cases of left-sided gastroschisis. One was treated successfully, but the another child died. We report the present two these two cases and a review of the literature.
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Affiliation(s)
- H Yoshioka
- Department of Pediatric Surgery, Kawasaki Medical School, 577 Matsushima, Kurashiki City, Okayama, Japan.
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Yokota S, Uchida T, Kokubo S, Aoyama K, Fukushima S, Nozaki K, Takahashi T, Fujimoto R, Sonohara R, Yoshida M, Higuchi S, Yokohama S, Sonobe T. Release of recombinant human bone morphogenetic protein 2 from a newly developed carrier. Int J Pharm 2003; 251:57-66. [PMID: 12527175 DOI: 10.1016/s0378-5173(02)00581-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
After implantation of a polymer-coated gelatin sponge (PGS) containing either 0.4 or 1.0 mg of 125I-rhBMP-2 for each 1 cm(3) of PGS into the right ulnar of rabbits, changes in the level of radioactivity at the implant site and in the blood were measured for 21 days after implantation, and the cumulative excretion ratio of radioactivity in the urine and feces was calculated. For both doses, radioactivity at the implant site was eliminated biphasically. The concentration of trichloroacetic acid (TCA)-precipitable radioactivity in the blood reached a maximum 6 h after implantation, at which time it was equivalent to 1.41% of the administered dose (0.4 mg/cm(3)). The remaining radioactivity was eliminated rapidly thereafter, falling below the detection limit within 48 h. The t(1/2alpha) was about 0.1 days, the t(1/2beta) was about 3 days, and the mean resident time (MRT) value was about 4 days. By 17 days after implantation, 88.1% of the administered radioactivity had been excreted in the urine, and 1.7% had been excreted in the feces. TCA precipitation test results indicated that most of the radioactivity excreted in urine was a low-molecular weight decomposition product. At 21 days after implantation, the radioactivity of the PGS implant site had declined to 0.5% of the administered amount. Autoradiographs of the implant site taken 28 days after implantation revealed that, at both doses, the residual radioactivity was confined to the area of the implanted PGS. These results indicate that PGS retains an appropriate amount of recombinant human bone morphogenetic protein 2 (rhBMP-2) at the orthotopically implanted site for at least 21 days enough to induce bone regeneration. Thus, PGS shows great clinical potential as a carrier for rhBMP-2.
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Affiliation(s)
- S Yokota
- Institute for Drug Development and Research, Yamanouchi Pharmaceutical Co, Ltd, 180 Ozumi, Yaizu-shi, Shizuoka 425-0072, Japan.
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Aoyama K, Yasunaga E, Takenaka I, Kadoya T, Sata T, Shigematsu A. Positive pressure ventilation during fibreoptic intubation: comparison of the laryngeal mask airway, intubating laryngeal mask and endoscopy mask techniques. Br J Anaesth 2002; 88:246-54. [PMID: 11878657 DOI: 10.1093/bja/88.2.246] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND The efficacy of delivery of mechanical ventilation through different airway devices during fibreoptic intubation is not known. METHODS We compared the laryngeal mask airway (LMA), intubating laryngeal mask (ILM) and endoscopy mask for positive pressure ventilation (PPV) during fibreoptic intubation. In 80 adult paralysed patients, fibreoptic intubation was performed during PPV using a combination of a size 3 or 4 LMA with a 6.0 mm nasal RAE tracheal tube (LMA3/4 group; n=22), a size 5 LMA with a 7.0 mm nasal RAE tube (LMA5 group; n=18), an ILM with an 8.0 mm special reinforced tracheal tube (ILM group; n=20) or an endoscopy mask (Patil mask) with a 7.5 mm standard tracheal tube (Patil group; n=20). The inspiratory and expiratory tidal volumes (VI and VE) with a ventilation pressure of 20 cm H2O were measured using a pneumotachograph. RESULTS Mean VE values during fibreoptic intubation in the LMA5 [5.3 (SD 1.5) ml kg(-1)] and ILM [7.1 (2.3) ml kg(-1)] groups were greater than in the LMA3/4 group [2.6 (1.0) ml kg(-1), P<0.0001]. The mean VE was greater in the Patil group [20.6 (4.9) ml kg(-1)] than in the other three groups (P<0.0001). Gastric insufflation during intubation was more frequent in the Patil group (30%) than in the other three groups (4.5-5.6%) (P<0.05). CONCLUSION PPV is possible with the LMA, ILM or endoscopy mask during fibreoptic intubation. With an airway pressure of 20 cm H2O, ventilation during intubation using a size 3 or 4 LMA was almost insufficient, while ventilation using a size 5 LMA or an ILM was almost acceptable. Ventilation during intubation with the endoscopy mask was greater than that with the LMA or ILM, but gastric insufflation was more frequent.
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Affiliation(s)
- K Aoyama
- Department of Anesthesia, Moji Rosai Hospital, Kitakyushu, Japan
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Abstract
Three experiments tested the hypothesis that habituation contributes to the regulation of wheel running. Rats ran in a wheel for 30-min sessions. Experiment 1 demonstrated spontaneous recovery. Rats ran more and the within-session decreases in running were smaller after 2 days of wheel deprivation than after 1 day. Experiment 2 demonstrated dishabituation. Running rate increased immediately after the termination of a brief extra event (application of the brake or flashing of the houselight). Experiment 3 demonstrated stimulus specificity. Rats completed the second half of the session in either the same wheel as the first half, or a different wheel. Second-half running was faster in the latter case. Within-session patterns of running were well described by equations that describe data from the habituation, motivation, and operant literatures. These results suggest that habituation contributes to the regulation of running. In fact, habituation provides a better explanation for the termination of wheel running than fatigue, the variable to which this termination is usually attributed. Overall, the present findings are consistent with the proposition that habituation and sensitization contribute to the regulation of several forms of motivated behavior.
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Affiliation(s)
- K Aoyama
- Department of Psychology, Doshisha University, Kyoto, Japan.
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Sadahira Y, Kumori K, Mikami Y, Otsuki T, Manabe T, Aoyama K. Post-transplant malignant lymphoma with monoclonal immunoglobulin gene rearrangement and polyclonal Epstein-Barr virus episomes. J Clin Pathol 2001; 54:887-9. [PMID: 11684728 PMCID: PMC1731324 DOI: 10.1136/jcp.54.11.887] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
This report describes the case of an 8 year old boy who developed ileocecal B cell lymphoma after liver transplantation. The patient underwent orthotopic liver transplantation for biliary atresia and had been given immunosuppressive drugs--cyclosporin A and tacrolimus hydrate. Six years after the liver transplantation, the patient had a sudden onset of fever and abdominal pain. Necropsy revealed an ileocecal mass that was a B cell lymphoma. Epstein-Barr virus (EBV) encoded RNA 1 was demonstrated in lymphoma cells and hyperplastic follicular germinal centre cells in various tissues. Although monoclonal immunoglobulin gene rearrangement was detected in the liver, EBV episomes were of polyclonal origin and lytic forms of EBV were also demonstrated by Southern blotting. Immunohistochemically, lymphoma cells were positive for p53 but negative for latent membrane protein 1 and EBV nuclear antigen 2. These findings suggested that this B cell lymphoma might have occurred sporadically, regardless of EBV infection.
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Affiliation(s)
- Y Sadahira
- Department of Pathology, Kawasaki Medical School, 577 Matsushima, Kurashiki 701-0192, Kurashiki, Japan.
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Suda Y, Kim YM, Ogawa T, Yasui N, Hasegawa Y, Kashihara W, Shimoyama T, Aoyama K, Nagata K, Tamura T, Kusumoto S. Chemical structure and biological activity of a lipid A component from Helicobacter pylori strain 206. ACTA ACUST UNITED AC 2001. [PMID: 11521089 DOI: 10.1177/09680519010070020301] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The chemical structure of a lipid A, which was obtained as a minor component from lipopolysaccharide of Helicobacter pylori strain 206-1, was determined to be a glucosamine beta-(1 -6) disaccharide 1-(2-aminoethyl)phosphate acylated by (R)-3-hydroxyoctadecanoic acid, (R)-3- hydroxyhexadecanoic acid, and (R)-3-(octadecanoyloxy)octadecanoic acid at the 2-, 3- and 2'-positions, respectively. Compared with the other major lipid A from the same strain, which was previously reported [Suda Y, Ogawa T, Kashihara W et al. Chemical structure of lipid A from Helicobacter pylori strain 206-1 lipopolysaccharide. J Biochem 1997; 121: 1129--1133], the structure was very similar with one exception. An (R)-3-hydroxyhexadecanoic acid was present at the 3-position of the novel lipid A component. The structure is apparently identical to one of the proposals by Moran et al. [Moran AP, Lindner B, Walsh EJ. Structural characterization of the lipid A component of Helicobacter pylori rough- and smooth-form lipopolysaccharides. J Bacteriol 1997; 179: 6453--6463], who concluded the same structure as the so-called major lipid A from the H. pylori strain NCTC 11637 but without isolating a homogeneous component. The endotoxic properties and pro-inflammatory cytokine-inducing activities of this novel tetra-acyl type lipid A were lower than those of previously reported major tri-acyl type lipid A.
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Affiliation(s)
- Y Suda
- Department of Chemistry, Graduate School of Science, Osaka University, Osaka, Japan.
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Aoyama K, Aiba H, Mizuno T. Genetic analysis of the His-to-Asp phosphorelay implicated in mitotic cell cycle control: involvement of histidine-kinase genes of Schizosaccharomyces pombe. Biosci Biotechnol Biochem 2001; 65:2347-52. [PMID: 11758939 DOI: 10.1271/bbb.65.2347] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Common histidine-to-aspartate (His-to-Asp) phosphorelay signaling systems involve three types of signaling components: a sensor His-kinase, a response regulator, and a histidine-containing phosphotransfer (HPt) protein. In the fission yeast Schizosaccharomyces pombe, two response regulators, Mcs4 and Prr1, have been identified, and it was shown that they are involved in signal transduction in stress responses. Furthermore, Mcs4 and Prr1 appear to be involved in mitotic cell-cycle control and meiosis, respectively. Recently we have identified Spy1 (also known as Mpr1), which encodes an HPt phosphotransmitter, and reported that Spy1, together with Mcs4, plays a role in cell cycle regulation. In this study, we identified and characterized three genes encoding histidine kinase, named Phk1, Phk2, and Phk3 (S. pombe histidine kinase) (also referred as Mak2, Mak3, and Mak1, respectively). Deletion of individual kinase genes has no apparent phenotypes but multiple deletion of these kinases showed the same phenotype of Spyl (Mpr1)-deficient cells, indicating precocious entry into M phase. These results indicated that three histidine kinases that work upstream of the HPt-transmitter, Spy1 (Mpr1), have a redundant function in cell cycle control.
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Affiliation(s)
- K Aoyama
- Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University, Japan
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Aoyama K, Yasunaga E, Takenaka I. Orthodontic appliances and insertion of the laryngeal mask airway. Anaesthesia 2001. [DOI: 10.1111/j.1365-2044.2001.2279-17.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Fukuyama H, Takenaka I, Aoyama K, Kadoya T. Diagnosis of laryngeal oedema before extubation after major neck surgery: use of fibreoptic assessment via a laryngeal mask airway. Anaesth Intensive Care 2001; 29:557-8. [PMID: 11669451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
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Aoyama K, Yasunaga E, Takenaka I. Orthodontic appliances and insertion of the laryngeal mask airway. Anaesthesia 2001; 56:1012-3. [PMID: 11576121 DOI: 10.1046/j.1365-2044.2001.02279-17.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Abstract
Pneumatosis intestinalis, which is linear or cystic gas within the bowel wall, is usually found in premature babies in association with necrotizing enterocolitis. Gastric pneumatosis defined as intramural gas of the stomach is a rare sign during infancy. We report an infant with Down's syndrome and a duodenal web with obvious gastric pneumatosis.
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Affiliation(s)
- S Kawano
- Department of Paediatrics, Kawasaki Medical School, Okayama, Japan.
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Fukuyama H, Takenaka I, Aoyama K, Kadoya T. Diagnosis of laryngeal oedema before extubation after major neck surgery: use of fibreoptic assessment via a laryngeal mask airway. Anaesth Intensive Care 2001; 29:438. [PMID: 11512660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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Aoyama K, Nagata M, Oshima K, Matsuda T, Aoki N. Molecular cloning and characterization of a novel dual specificity phosphatase, LMW-DSP2, that lacks the cdc25 homology domain. J Biol Chem 2001; 276:27575-83. [PMID: 11346645 DOI: 10.1074/jbc.m100408200] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
A novel dual specificity phosphatase (DSP) designated LMW-DSP2 was cloned with a combination of reverse transcription-polymerase chain reaction and cDNA library screening strategies. The LMW-DSP2 open reading frame of 194 amino acids contained a single DSP catalytic domain but lacked the cdc25 homology domain, which is conserved in most known DSPs. Northern blot and reverse transcription-polymerase chain reaction analyses revealed that LMW-DSP2 was specifically expressed in testis. Recombinant LMW-DSP2 protein exhibited phosphatase activity toward an artificial low molecular weight substrate para-nitrophenyl phosphate, and the activity was inhibited completely by sodium orthovanadate but not sodium fluoride, pyrophosphate, and okadaic acid. The substitution of critical amino acid residues, aspartic acid and cysteine, resulted in a dramatic reduction of phosphatase activity. Transient transfection of LMW-DSP2 in COS7 cells resulted in the expression of a 21-kDa protein, and the phosphatase was shown to be distributed in both the cytosol and the nucleus. LMW-DSP2 dephosphorylated and deactivated p38, to a higher extent, and stress-activated protein kinase (SAPK)/c-Jun N-terminal kinase (JNK), but not extracellular signal-regulated kinase 1/2 mitogen-activated protein kinases, in transfected COS7 cells and in vitro. Interestingly, mutation in a conserved docking motif of p38 and SAPK/JNK as well as in a cluster of aspartic acids of LMW-DSP2 did not affect the deactivation of the mitogen-activated protein kinases by LMW-DSP2. Furthermore, the binding between LMW-DSP2 and p38 and SAPK/JNK was also not disrupted by such mutations. Among the DSPs lacking the cdc25 homology domain, LMW-DSP2 is the first one that dephosphorylates and deactivates p38 and SAPK/JNK.
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Affiliation(s)
- K Aoyama
- Department of Applied Molecular Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
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Shimizu K, Ohtaki K, Matsubara K, Aoyama K, Uezono T, Saito O, Suno M, Ogawa K, Hayase N, Kimura K, Shiono H. Carrier-mediated processes in blood--brain barrier penetration and neural uptake of paraquat. Brain Res 2001; 906:135-42. [PMID: 11430870 DOI: 10.1016/s0006-8993(01)02577-x] [Citation(s) in RCA: 179] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Due to the structural similarity to N-methyl-4-phenyl pyridinium (MPP(+)), paraquat might induce dopaminergic toxicity in the brain. However, its blood--brain barrier (BBB) penetration has not been well documented. We studied the manner of BBB penetration and neural cell uptake of paraquat using a brain microdialysis technique with HPLC/UV detection in rats. After subcutaneous administration, paraquat appeared dose-dependently in the dialysate. In contrast, MPP(+) could not penetrate the BBB in either control or paraquat pre-treated rats. These data indicated that the penetration of paraquat into the brain would be mediated by a specific carrier process, not resulting from the destruction of BBB function by paraquat itself or a paraquat radical. To examine whether paraquat was carried across the BBB by a certain amino acid transporter, L-valine or L-lysine was pre-administered as a co-substrate. The pre-treatment of L-valine, which is a high affinity substrate for the neutral amino acid transporter, markedly reduced the BBB penetration of paraquat. When paraquat was administered to the striatum through a microdialysis probe, a significant amount of paraquat was detected in the striatal cells after a sequential 180-min washout with Ringer's solution. This uptake was significantly inhibited by a low Na(+) condition, but not by treatment with putrescine, a potent uptake inhibitor of paraquat into lung tissue. These findings indicated that paraquat is possibly taken up into the brain by the neutral amino acid transport system, then transported into striatal, possibly neuronal, cells in a Na(+)-dependent manner.
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Affiliation(s)
- K Shimizu
- Department of Legal Medicine, Asahikawa Medical College, Asahikawa 078-8510, Japan
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Abstract
Five putative dual specificity protein phosphatases (DSPs), designated LMW-DSP1, -DSP4, -DSP6, -DSP10, and -DSP11, were cloned with a combination of RT-PCR and cDNA library screening strategies. Sequencing analysis revealed that all lacked the cdc25 homology domain that is conserved in most known DSPs/MAP kinase phosphatases (MKPs). LMW-DSP1 exhibited the highest similarity to plant DSPs. LMW-DSP4 exhibited the highest similarity to human YVH1 and rat GKAP, but its C-terminal region was much shorter than that of the human and rat clones. LMW-DSP6 was found to be identical to recently cloned TMDP, and LMW-DSP11 seemed to be a mouse ortholog of human VHR. LMW-DSP10 was found to have a DSP catalytic-like domain, but the critical cysteine residue for catalytic activity was missing. Recombinant LMW-DSP1, -DSP6, and -DSP11 exhibited obvious and strong activity against an artificial low molecular substrate, para-nitrophenyl phosphate (pNPP). Recombinant LMW-DSP4 exhibited slight but significant activity, whereas no activity was detected for LMW-DSP10. The phosphatase activity of the recombinant LMW-DSPs was inhibited by orthovanadate but not sodium fluoride. However, none of the DSPs could dephosphorylate MAP kinases such as ERK1, p38, and SAPK/JNK in transiently transfected COS7 cells under the conditions used. Northern blot analysis revealed that LMW-DSP1, -DSP6, -DSP10, and -DSP11 were specifically expressed in testis, while LMW-DSP4 was broadly expressed. The testis-specific expression and apparent absence of dephosphorylation action on MAP kinases suggest that LMW-DSP1, -DSP6, -DSP10, and -DSP11 play specific roles in testis. Taken together, it is conceivable that a distinct class of low molecular mass DSPs is present and plays a role in dephosphorylating unknown molecules other than MAP kinases.
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Affiliation(s)
- N Aoki
- Department of Applied Molecular Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan.
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Aoyama K, Ishikura H, Mishima S, Murai M, Tsumura H, Kumakura S, Kobayashi S. Guillain-Barré syndrome complicated with hemolytic anemia in association with antiganglioside GM3 antibody. Am J Med 2001; 110:399-400. [PMID: 11286955 DOI: 10.1016/s0002-9343(01)00620-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- K Aoyama
- Department of Internal Medicine III, Shimane, Medical University, Izumo, Japan
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Aoyama K, Matsubara K, Okada K, Fukushima S, Shimizu K, Yamaguchi S, Uezono T, Satomi M, Hayase N, Ohta S, Shiono H, Kobayashi S. N-methylation ability for azaheterocyclic amines is higher in Parkinson's disease: nicotinamide loading test. J Neural Transm (Vienna) 2001; 107:985-95. [PMID: 11041277 DOI: 10.1007/s007020070047] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The discovery of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) leads to the hypothesis that Parkinson's disease (PD) is may be initiated or precipitated by endogenous toxins by the mechanism similar to that of MPTP in genetically-predisposed individuals. The higher cerebrospinal fluid levels of N-methylated azaheterocyclic amines, such as beta-carboline and tetrahydroisoquinoline, have been found in parkinsonian patients compared with age-matched controls. To estimate the N-methylation ability for azaheterocyclic amines in parkinsonian patient, nicotinamide was dosed with 100 mg to 26 parkinsonians and 20 controls consisted of 16 other neurogenic disease patients and 4 healthy volunteers. The urine was collected for 4 h, and then analyzed urinary its metabolites by an improved HPLC method. Nicotinamide has a pyridine ring in its structure and may be metabolized through the pathways similar to those for the endogenous neurotoxins. The urinary excretions of nicotinamide metabolites were significantly affected by aging. The excretion of N1-methylnicotinamide decreased along with aging both in PD patients and controls. In younger (65 years old or younger) PD patients, the excretion amount of N1-methylnicotinamide was significantly higher than that in younger controls. The decline rate of N1-methylnicotinamide excretion in parkinsonians was significantly greater than that in controls; the rate is more than 2-fold higher in parkinsonian patients. The age-associated decrease in 1-methyl-2-pyridone-5-carboxyamide excretion was observed only in parkinsonian patients, but not in controls. The total excreted amount of N-methylated metabolites (N1-methylnicotinamide plus 1-methyl-2-pyridone-5-carboxyamide) was also observed the age-related decline in both groups. The urinary excretions of nicotinamide and nicotinamide-N-oxide were not influenced by aging. These results would indicate that the excess N-methylation ability for azaheterocyclic amines before the onset had been implicated in PD. On the other hand, the present results suggested that the contribution of aberrant cytochrome P450 or aldehyde oxidase activity acting on the pyridine ring, that could act as detoxification routes of endogenous neurotoxins, would be small in the etiology of PD.
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Affiliation(s)
- K Aoyama
- Department of Hospital Pharmacy & Pharmacology, Asahikawa Medical College, Japan
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