1
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Miyaue K, Hoshi T, Isono H. Ulcerative sarcoidosis: An atypical cause of leg ulcers. Clin Case Rep 2024; 12:e8592. [PMID: 38444914 PMCID: PMC10912090 DOI: 10.1002/ccr3.8592] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 02/08/2024] [Accepted: 02/08/2024] [Indexed: 03/07/2024] Open
Abstract
We present the case of an 83-year-old woman with leg ulcers who was diagnosed with sarcoidosis. This case highlights the importance for clinicians to consider ulcerative sarcoidosis when encountering patients with leg ulcers along with hilar adenopathy, uveitis, elevated serum angiotensin-converting enzyme, and histopathological findings of epithelioid cell granulomas.
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Affiliation(s)
- Kazuki Miyaue
- Department of General MedicineHITO Medical CenterEhimeJapan
| | - Tetsuya Hoshi
- Department of General Internal MedicineTeine Keijinkai HospitalSapporoJapan
| | - Hiroki Isono
- Department of General MedicineHITO Medical CenterEhimeJapan
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2
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Kubota T, Mori Y, Yamada G, Cammack I, Shinohara T, Matsuzaka S, Hoshi T. Listeria monocytogenes Ankle Osteomyelitis in a Patient with Rheumatoid Arthritis on Adalimumab: A Report and Literature Review of Listeria monocytogenes Osteomyelitis. Intern Med 2021; 60:3171-3176. [PMID: 34602523 PMCID: PMC8545638 DOI: 10.2169/internalmedicine.5633-20] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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] [Received: 06/16/2020] [Accepted: 03/07/2021] [Indexed: 11/24/2022] Open
Abstract
Localized Listeria infection predominantly occurs in the prosthetic and hip joints. We herein report a case of Listeria monocytogenes ankle osteomyelitis in a 73-year-old man receiving adalimumab who was transferred to our hospital because of suspected rheumatoid arthritis (RA) flare. He reported a four-month history of left ankle swelling. A surgical biopsy revealed L. monocytogenes osteomyelitis in the left tibia and talus bones. The patient was successfully treated with antibiotics and surgical debridement. Thus, infection due to L. monocytogenes can present as ankle osteomyelitis in immunocompromised patients and may mimic an RA flare.
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Affiliation(s)
- Takafumi Kubota
- Department of General Internal Medicine, Teine Keijinkai Hospital, Japan
- Department of Neurology, University Hospitals of Cleveland Medical Center, Case Western Reserve University, U.S.A
| | - Yuichiro Mori
- Department of General Internal Medicine, Teine Keijinkai Hospital, Japan
- Department of Cardiology, Teine Keijinkai Hospital, Japan
| | - Gen Yamada
- Department of Biostatistics, School of Public Health, Graduate School of Medicine, University of Tokyo, Japan
| | | | | | - Suguru Matsuzaka
- Department of General Internal Medicine, Teine Keijinkai Hospital, Japan
| | - Tetsuya Hoshi
- Department of General Internal Medicine, Teine Keijinkai Hospital, Japan
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3
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Usami K, Watabe H, Otani M, Maruta S, Hiraya D, Hoshi T, Sato A, Ieda M. Impact of coronary plaque characteristics on periprocedural myocardial injury after elective percutaneous coronary intervention -MDCT and CMR analysis-. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0203] [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: 11/14/2022] Open
Abstract
Abstract
Background
Percutaneous coronary intervention (PCI) is often complicated by periprocedural myocardial injury (PMI) manifested by elevated cardiac biomarkers. The occurrence of PMI has been shown to be associated with worse clinical outcome over short- and long-term.
Purpose
We performed multidetector computed tomography (MDCT) and cardiac magnetic resonance imaging (CMR) to evaluate the relationship between culprit plaque characteristics and PMI.
Methods
A total of 90 patients who underwent elective PCI were underwent CMR and multidetector coronary tomography before PCI. The high intensity plaque (HIP) on CMR was defined as a coronary plaque to myocardium signal intensity ratio (PMR) of >1.4. The plaque characteristics and the presence of napkin-ring sign (NRS) were analyzed on MDCT. PMI was defined as an increase in cardiac Troponin T levels to more than 5 times the upper limit of normal at 24 h after PCI. Patients were divided into 2 groups according to the presence (Group I, n=26) or absence (Group II, n=64) of PMI.
Results
Spotty calcification, positive remodeling, low attenuation plaque and NRS on MDCT were significantly more observed in Group I than in Group II. HIP on CMR was significantly more observed in Group I than in Group II. In the multivariable logistic regression analysis, the presence of NRS and HIP were significantly independent predictors of PMI (odds ratio (OR) 4.82, 95% confidence interval 1.13–20.60, P=0.034 and OR 3.66, 95% CI 1.09–12.30, P=0.036, respectively). Moreover, for prediction of PMI, NRS and HIP showed a high positive predictive value of 81%, and their absence showed a high negative predictive value of 91%.
Conclusions
MDCT and CMR may play an important role in detecting which lesions are high risks for myocardial necrosis after PCI in elective coronary stenting.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- K Usami
- Tsukuba University Hospital, Tsukuba, Japan
| | - H Watabe
- Tsukuba University Hospital, Tsukuba, Japan
| | - M Otani
- Tsukuba University Hospital, Tsukuba, Japan
| | - S Maruta
- Tsukuba University Hospital, Tsukuba, Japan
| | - D Hiraya
- Tsukuba University Hospital, Tsukuba, Japan
| | - T Hoshi
- Tsukuba University Hospital, Tsukuba, Japan
| | - A Sato
- Tsukuba University Hospital, Tsukuba, Japan
| | - M Ieda
- Tsukuba University Hospital, Tsukuba, Japan
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4
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Hiraya D, Sato A, Hoshi T, Watabe H, Ieda M. Association of coronary high-intensity plaque on T1-weighted magnetic resonance imaging and circulating malondialdehyde-modified low-density lipoprotein levels with cardiac events. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Although elevated oxidized low-density lipoprotein could play critical roles in vulnerable plaque, there are no studies that compared coronary high-intensity plaque (HIP) on non-contrast T1-weighted magnetic resonance imaging (T1WI_MRI) and circulating malondialdehyde-modified low-density lipoprotein (MDA-LDL) levels for the prediction of cardiac events.
Methods and results
A total of 139 patients with coronary artery stenosis (>70%) were examined with non-contrast T1WI using a 1.5-T MRI (HIP: n=63, non-HIP: n=76). Scheduled percutaneous coronary intervention (PCI) for culprit lesions was performed within 48 h after MRI. HIP was defined as a signal intensity of coronary plaque to cardiac muscle ratio (PMR) of ≥1.4. At admission, circulating levels of MDA-LDL and other lipid-related markers were measured. We evaluated the subsequent cardiac events, which were defined as major adverse cardiac events (MACE; cardiac death, myocardial infarction, and/or ischemia-driven PCI) during follow-up periods (5.6±1.3 years). Circulating MDA-LDL levels were significantly higher in patients with HIP than in those without HIP (p<0.0001). MDA-LDL levels were significantly correlated with PMR (r=0.490, p<0.0001). In multivariable logistic regression analysis, MDA-LDL levels were independently associated with the presence of HIP (OR 1.05; 95% CI, 1.02–1.08, p<0.0001). The incidence of MACE was significantly higher in patients with HIP (27%) than in those without HIP (5%; p=0.011 by the log-rank test). In the multivariable Cox proportional hazard analysis, the MDA-LDL levels (HR 1.03; 95% CI:1.01–1.05, p=0.007) and PMR (HR 2.39; 95% CI:1.19–4.65, p=0.016) were significantly associated with MACE. For MACE prediction, the C-statistic values for MDA-LDL, PMR, and PMR+MDA-LDL were 0.724, 0.791, and 0.800, respectively. Compared with MDA-LDL alone, the addition of PMR to MDA-LDL increased the net reclassification improvement by 0.78 (p=0.012).
Conclusions
MDA-LDL levels might be associated with the presence of HIP in patients with coronary artery disease. Furthermore, adding PMR to MDA-LDL levels markedly improved MACE prediction.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- D Hiraya
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - A Sato
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - T Hoshi
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - H Watabe
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - M Ieda
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
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5
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Hiraya D, Sato A, Hoshi T, Ichinohe T, Sakai S, Watabe H, Ieda M. P3098Association with coronary high-intensity plaque on T1-weighted magnetic resonance imaging and circulating levels of malondialdehyde-modified low-density lipoprotein. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz745.0174] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Objectives
This study aimed to evaluate the association with coronary high-intensity plaque (HIP) on non-contrast T1-weighted magnetic resonance imaging (T1WI) and circulating levels of malondialdehyde-modified low-density lipoprotein (MDA-LDL).
Methods
A total of 139 patients with coronary artery stenosis (>70%) were imaged with non-contrast T1WI by using a 1.5-T magnetic resonance system (HIP: n=60, non-HIP: n=79). HIP was defined as a signal intensity of coronary plaque to cardiac muscle ratio (PMR) of ≥1.4. At admission, circulating levels of MDA-LDL and other lipid-related markers (triglyceride, HDL, LDL, Lp(a), RLP-C, and EPA/AA) were measured.
Results
Circulating levels of MDA-LDL (p=0.001) and LDL (p=0.041) were significantly higher in patients with HIP than those without, whereas the other lipid-related markers were not significantly different between both groups. In multivariable logistic regression analysis, MDA-LDL levels were independently associated with the presence of HIP (OR 1.03; 95% CI, 1.00–1.06, p=0.015) after adjusting for cofounding factors (age, sex, triglyceride, LDL, Lp(a), RLP-C, and EPA/AA). The optimal MDA-LDL threshold for predicting coronary HIP was 90.4 U/L, identified by the receiver operating characteristic curve.
Conclusion
MDA-LDL levels might be associated with the presence of HIP in patients with coronary artery disease.
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Affiliation(s)
- D Hiraya
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - A Sato
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - T Hoshi
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - T Ichinohe
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - S Sakai
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - H Watabe
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - M Ieda
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
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6
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Hiraya D, Sato A, Hoshi T, Watabe H, Yoshida K, Komatsu Y, Kuroki K, Yamasaki H, Sekiguchi Y, Takeyasu N, Nogami A, Aonuma K. P6601Association of coronary artery disease and revascularization with recurrence of atrial fibrillation after catheter ablation. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.p6601] [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] [Indexed: 11/12/2022] Open
Affiliation(s)
- D Hiraya
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - A Sato
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - T Hoshi
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - H Watabe
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - K Yoshida
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Y Komatsu
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - K Kuroki
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - H Yamasaki
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Y Sekiguchi
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - N Takeyasu
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - A Nogami
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - K Aonuma
- Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
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7
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Sakai S, Sato A, Hoshi T, Hiraya D, Ishii Y, Yaguchi T, Aonuma K, Nogami A. P6487Relationship between difference in morphology of protrusion detected by OCT and findings of coronary angioscopy. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.p6487] [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] [Indexed: 11/13/2022] Open
Affiliation(s)
- S Sakai
- University of Tsukuba, tsukuba, Japan
| | - A Sato
- University of Tsukuba, tsukuba, Japan
| | - T Hoshi
- University of Tsukuba, tsukuba, Japan
| | - D Hiraya
- University of Tsukuba, tsukuba, Japan
| | - Y Ishii
- University of Tsukuba, tsukuba, Japan
| | - T Yaguchi
- University of Tsukuba, tsukuba, Japan
| | - K Aonuma
- University of Tsukuba, tsukuba, Japan
| | - A Nogami
- University of Tsukuba, tsukuba, Japan
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8
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Yoshikawa Y, Nakamoto M, Hoshi T, Nakamura M, Imai S, Kawase Y, Matsuo H, Saito N. P1788A novel software for on-site estimation of fractional flow reserve using coronary computed tomography images. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1788] [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] [Indexed: 11/14/2022] Open
Affiliation(s)
- Y Yoshikawa
- Kyoto University Graduate School of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
| | | | - T Hoshi
- EBM Corporation, Tokyo, Japan
| | - M Nakamura
- Nagoya Institute of Technology, Biomechanics Laboratory, Electrical and Mechanical Engineering, Nagoya, Japan
| | - S Imai
- Gifu Heart Center, Department of Cardiovascular Medicine, Gifu, Japan
| | - Y Kawase
- Gifu Heart Center, Department of Cardiovascular Medicine, Gifu, Japan
| | - H Matsuo
- Gifu Heart Center, Department of Cardiovascular Medicine, Gifu, Japan
| | - N Saito
- Kyoto University Graduate School of Medicine, Department of Cardiovascular Medicine, Kyoto, Japan
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9
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Matsuzaka S, Nagai Y, Hoshi T, Serizawa Y. MRI Cannot Detect Calcification for the Diagnosis of Fahr's Syndrome. Intern Med 2018; 57:1951-1952. [PMID: 29434144 PMCID: PMC6064688 DOI: 10.2169/internalmedicine.0514-17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Affiliation(s)
- Suguru Matsuzaka
- Teine Keijinkai Hospital, General Internal Medicine and Infectious Disease Medicine, Japan
| | - Yuki Nagai
- Teine Keijinkai Hospital, General Internal Medicine and Infectious Disease Medicine, Japan
| | - Tetsuya Hoshi
- Teine Keijinkai Hospital, General Internal Medicine and Infectious Disease Medicine, Japan
| | - Yoritomo Serizawa
- Teine Keijinkai Hospital, General Internal Medicine and Infectious Disease Medicine, Japan
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10
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Affiliation(s)
- Suguru Matsuzaka
- Teine Keijinkai Hospital General Internal Medicine and Infectious Disease Medicine Hokkaido, Japan
| | - Yuki Nagai
- Teine Keijinkai Hospital General Internal Medicine and Infectious Disease Medicine Hokkaido, Japan
| | - Tetsuya Hoshi
- Teine Keijinkai Hospital General Internal Medicine and Infectious Disease Medicine Hokkaido, Japan
| | - Yoritomo Serizawa
- Teine Keijinkai Hospital General Internal Medicine and Infectious Disease Medicine Hokkaido, Japan
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11
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Abe Y, Watabe H, Nishina H, Aihara H, Noguchi Y, Hoshi T, Aonuma K, Sato A. P537The prediction of myocardial hemorrhage by contrast delayed enhancement with multidetector computed tomography (MDCT) immediately after coronary angioplasty in acute myocardial infarction. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx501.p537] [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: 11/13/2022] Open
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12
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Kawabe M, Sato A, Hoshi T, Aonuma K. 5711Impact of in-stent neoatherosclerosis assessed by optical coherent tomography on cardiac troponin elevation after percutaneous coronary intervention. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.5711] [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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13
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Kong F, Hoshi T, Li S, Xu L, Ai B, Yan Z, Ding G, Si M. ASSOCIATION BETWEEN HEALTH STATUS AND LONG-TERM CARE NEEDS: A COHORT STUDY OF JAPANESE ELDERLY. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.3068] [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: 11/14/2022] Open
Affiliation(s)
- F. Kong
- Department of Social Medicine and Health Services Management, Shandong University, Jinan, Shandong, China,
| | - T. Hoshi
- Tokyo Metropolitan University, Tokyo, Japan,
| | - S. Li
- Department of Social Medicine and Health Services Management, Shandong University, Jinan, Shandong, China,
| | - L. Xu
- Department of Social Medicine and Health Services Management, Shandong University, Jinan, Shandong, China,
| | - B. Ai
- Minzu University of China, Beijing, China,
| | - Z. Yan
- CDC of Zibo City, Zibo, China
| | - G. Ding
- Department of Social Medicine and Health Services Management, Shandong University, Jinan, Shandong, China,
| | - M. Si
- Department of Social Medicine and Health Services Management, Shandong University, Jinan, Shandong, China,
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14
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Hayashi Y, Ikaga T, Ando S, Schmidt S, Hoshi T. REGULATING INDOOR TEMPERATURE AND HUMIDITY: SUCCESSFUL CARE PREVENTION IN WARMER NURSING HOMES IN JAPAN. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.2423] [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: 11/15/2022] Open
Affiliation(s)
- Y. Hayashi
- Graduate School of Science and Technology, Keio University, Yokohama, Kanagawa, Japan,
| | - T. Ikaga
- Graduate School of Science and Technology, Keio University, Yokohama, Kanagawa, Japan,
| | - S. Ando
- University of Kitakyushu, Kitakyushu, Fukuoka, Japan,
| | | | - T. Hoshi
- Tokyo Metropolitan University, Tokyo, Japan
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15
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Matsuzaka S, Hoshi T, Yamada G, Ohashi Y, Yorozu H, Miyamoto S, Takamatsu A, Koyama H, Honda N, Serizawa Y. [Meningitis-retention Syndrome Presented with Primary Symptom of Urinary Retention]. Nihon Naika Gakkai Zasshi 2017; 106:107-113. [PMID: 30179416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
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16
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Kimura T, Adachi Y, Matsuki M, Yamaguchi A, Ozawa Y, Okamoto K, Mitsuhashi K, Hoshi T, Tohyama O, Tai K, Ogo M, Matsui J, Funahashi Y. The antitumor activity of lenvatinib (LEN) in combination with everolimus (EVE) in human renal cell carcinoma (RCC) xenograft models is dependent on VEGFR and FGFR signaling. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw362.06] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Abstract
We evaluated the brain lesions of patients with chronic alcoholism (n = 34) in comparison with age- and sex-matched controls (n = 40) by MR imaging. T1-weighted sagittal and axial images and T2-weighted axial images were obtained with a 0.5 T superconducting MR unit. Various brain measurements were then performed, and the presence of regions of abnormal signal intensity was also compared between the two groups. The brain measurements revealed significant cerebral atrophy (characterized by lateral and 3rd ventricular dilatation, and widening of the interhemispheric fissure) as well as significant cerebellar atrophy (represented by 4th ventricular dilatation) in the alcoholic group. These changes were more prominent in patients in their fifties and sixties than in those aged in the thirties and forties. Focal hypointense lesions were observed in 20.6% of the alcoholics and in 5% of the controls (p < 0.01), while focal hyperintense lesions were observed in 61.8% of the alcoholics and in 20% of the controls (p < 0.001). The severity of these MR findings correlated well with the age of the patients. These observations suggest that alcohol is an important promotor of brain aging.
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18
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Hoshi T, Heinemann SH. Modulation of BK Channels by Small Endogenous Molecules and Pharmaceutical Channel Openers. Int Rev Neurobiol 2016; 128:193-237. [PMID: 27238265 DOI: 10.1016/bs.irn.2016.03.020] [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] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Voltage- and Ca(2+)-activated K(+) channels of big conductance (BK channels) are abundantly found in various organs and their relevance for smooth muscle tone and neuronal signaling is well documented. Dysfunction of BK channels is implicated in an array of human diseases involving many organs including the nervous, pulmonary, cardiovascular, renal, and urinary systems. In humans a single gene (KCNMA1) encodes the pore-forming α subunit (Slo1) of BK channels, but the channel properties are variable because of alternative splicing, tissue- and subcellular-specific auxiliary subunits (β, γ), posttranslational modifications, and a multitude of endogenous signaling molecules directly affecting the channel function. Initiatives to develop drugs capable of activating BK channels (channel openers) therefore need to consider the tissue-specific variability of BK channel structure and the potential interference with endogenously produced regulatory factors. The atomic structural basis of BK channel function is only beginning to be revealed. However, building on detailed knowledge of BK channel function, including its single-channel characteristics, voltage- and Ca(2+) dependence of channel gating, and modulation by diffusible messengers, a multi-tier allosteric model of BK channel gating (Horrigan and Aldrich (HA) model) has become a valuable tool in studying modulation of the channel. Using the conceptual framework of the HA model, we here review the functional impact of endogenous modulatory factors and select small synthetic compounds that regulate BK channel activity. Furthermore, we devise experimental approaches for studying BK channel-drug interactions with the aim to classify BK-modulating substances according to their molecular mode of action.
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Affiliation(s)
- T Hoshi
- University of Pennsylvania, Philadelphia, PA, United States.
| | - S H Heinemann
- Friedrich Schiller University Jena & Jena University Hospital, Jena, Germany
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19
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Chaves LF, Imanishi N, Hoshi T. Population dynamics of Armigeres subalbatus (Diptera: Culicidae) across a temperate altitudinal gradient. Bull Entomol Res 2015; 105:589-597. [PMID: 26074401 DOI: 10.1017/s0007485315000474] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Understanding the impacts of weather fluctuations, and environmental gradients, on the abundance of vectors is fundamental to grasp the dynamic nature of the entomological risk for disease transmission. The mosquito Armigeres subalbatus (Coquillet) is a common vector of filariasis. Nevertheless, its population dynamics have been relatively poorly studied. Here, we present results from a season long study where we studied spatio-temporal abundance patterns of Ar. subalbatus across the altitudinal gradient of Mt. Konpira in Nagasaki, Japan. Spatially, we found that abundance of adult Ar. subalbatus decreased with altitude and increased in areas where the ground was rich in leaf litter. Similarly, adult activity was observed only when relative humidity was over 65%. Temporally, we found that peaks in abundance followed large rainfall events. Nevertheless, this mosquito was under significant density dependence regulation. Our results suggest that Ar. subalbatus population peaks following large rainfall events could reflect the recruitment of individuals that were dormant as dry eggs. We did not find a clear signal of temperature on abundance changes of this mosquito, but only on its phenology. Since ground cover seemed more critical than temperature to its spatial distribution, we propose that this mosquito might have some degree of autonomy to changes in temperature.
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Affiliation(s)
- L F Chaves
- Institute of Tropical Medicine (NEKKEN),Nagasaki University,Sakamoto 1-12-4,Nagasaki 852-8523,Japan
| | - N Imanishi
- Institute of Tropical Medicine (NEKKEN),Nagasaki University,Sakamoto 1-12-4,Nagasaki 852-8523,Japan
| | - T Hoshi
- Institute of Tropical Medicine (NEKKEN),Nagasaki University,Sakamoto 1-12-4,Nagasaki 852-8523,Japan
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Hoshi T, Tanigawa C, Miura M, Nzou SM, Ibrahim KO, Mwau M, Fujii Y, Goto K, Kaneko S. Spatial Clusters of HIV-Negative and HIV-Positive Populations in a Highly Endemic Area of Western Kenya. Int J Epidemiol 2015. [DOI: 10.1093/ije/dyv096.132] [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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21
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Hung GMY, John NW, Hancock C, Gould DA, Hoshi T. UltraPulse--simulating a human arterial pulse with focussed airborne ultrasound. Annu Int Conf IEEE Eng Med Biol Soc 2015; 2013:2511-4. [PMID: 24110237 DOI: 10.1109/embc.2013.6610050] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Medical simulators provide a risk-free environment for trainee doctors to practice and improve their skills. UltraPulse is a new tactile system designed to utilise focussed airborne ultrasound to mimic a pulsation effect such as that of a human arterial pulse. In this paper, we focus on the construction of the haptics component, which can later be integrated into a variety of medical procedure training simulators.
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Hoshi T, Saito Y. Specificity of sodium-dependent electrogenic sugar transport in amphibian kidney proximal tubule. Contrib Nephrol 2015; 6:52-60. [PMID: 852303 DOI: 10.1159/000399752] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Microelectrode studies were performed to examine the specificity of the electrogenic sugar transport by Triturus proximal tubule. Two types of carriers could be distinguished, one having an affinity for D-mannose but not for D-xylose (M type), and the other having the reverse characteristics (X type). D-Glucose and alpha-methyl-D-glucoside had a relatively high affinity for both types of carriers, but D-galactose, D-fructose, 3-O-methyl-D-glucose, D-mannitol and L-glucose had no affinity for them. The observed structural requirements of renal sugar transport were different from and stricter than those of intestinal sugar transport observed in the same animal.
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Abstract
Large-conductance Ca2+ -and voltage-gated K+ channels are activated by an increase in intracellular Ca2+ concentration and/or depolarization. The channel activation mechanism is well described by an allosteric model encompassing the gate, voltage sensors, and Ca2+ sensors, and the model is an excellent framework to understand the influences of auxiliary β and γ subunits and regulatory factors such as Mg2+. Recent advances permit elucidation of structural correlates of the biophysical mechanism.
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Affiliation(s)
- T Hoshi
- Department of Physiology, The University of Pennsylvania, Philadelphia, Pennsylvania, USA
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Hoshi T, Sakai S, Sato A, Aonuma K. Impact of diabetes on vascular healing response after everolimus-eluting stent implantation. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht309.p3959] [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: 11/14/2022] Open
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25
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Hoshi T, Sato A, Kawabe M, Sakai S, Kakefuda Y, Abe D, Takeyasu N, Noguchi Y, Aonuma K. The prognostic value of discharge heart rate in patients with impaired left ventricular function after acute myocardial infarction. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht308.p1321] [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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Watabe H, Sato A, Seika S, Harunari T, Kakefuda Y, Hoshi T, Nishina H, Takeyasu N, Noguchi Y, Aonuma K. Effect of statin therapy on long-term outcome in acute coronary syndrome patients who have low low-density lipoprotein cholesterol. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht308.p2279] [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: 11/14/2022] Open
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Abe D, Sato A, Maruta S, Misaki M, Hoshi T, Takeyasu N, Aonuma K. Clinical value of drug-eluting stent over bare-metal stents in large coronary arteries in the patients with ST-segment elevation myocardial infarction. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht309.p3034] [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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Abstract
AbstractThe hardness of single crystal GaN (gallium nitride) at elevated temperature is measured for the first time and compared with other materials. A Vickers indentation method was used to determine the hardness of crack-free GaN samples under an applied load of 0.5N in the temperature range 20 - 1200°C. The hardness is 10.8 GPa at room temperature, which is comparable to that of Si. At elevated temperatures GaN shows higher hardness than Si and GaAs. A high mechanical stability for GaN at high temperature is deduced.
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Hoshi T, Yamamoto S, Fujiwara T, Sogabe T, Zhang SL. An order-N electronic structure theory with generalized eigenvalue equations and its application to a ten-million-atom system. J Phys Condens Matter 2012; 24:165502. [PMID: 22466683 DOI: 10.1088/0953-8984/24/16/165502] [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: 05/31/2023]
Abstract
A linear algebraic theory called the 'multiple Arnoldi method' is presented and realizes large-scale (order-N) electronic structure calculations with generalized eigenvalue equations. A set of linear equations, in the form of (zS - H)x = b, are solved simultaneously with multiple Krylov subspaces. The method is implemented in a simulation package ELSES (www.elses.jp) with tight-binding-form Hamiltonians. A finite-temperature molecular dynamics simulation is carried out for metallic and insulating materials. A calculation with 10(7) atoms was realized by a workstation. The parallel efficiency is shown up to 1024 CPU cores.
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Affiliation(s)
- T Hoshi
- Department of Applied Mathematics and Physics, Tottori University, Tottori, Japan.
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Honda H, Padival S, Heist B, Hoshi T. Pervasive Pneumatosis in a Patient on Immunosuppressive Agents. Clin Infect Dis 2011. [DOI: 10.1093/cid/cir517] [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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Hoshi T, Takahashi M, Iwamoto T, Shinoda H. Noncontact Tactile Display Based on Radiation Pressure of Airborne Ultrasound. IEEE Trans Haptics 2010; 3:155-165. [PMID: 27788070 DOI: 10.1109/toh.2010.4] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This paper describes a tactile display which provides unrestricted tactile feedback in air without any mechanical contact. It controls ultrasound and produces a stress field in a 3D space. The principle is based on a nonlinear phenomenon of ultrasound: Acoustic radiation pressure. The fabricated prototype consists of 324 airborne ultrasound transducers, and the phase and intensity of each transducer are controlled individually to generate a focal point. The DC output force at the focal point is 16 mN and the diameter of the focal point is 20 mm. The prototype produces vibrations up to 1 kHz. An interaction system including the prototype is also introduced, which enables users to see and touch virtual objects.
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Hoshi T, Yamagami H, Furukado S, Miwa K, Tanaka M, Sakaguchi M, Sakoda S, Kitagawa K. Serum inflammatory proteins and frontal lobe dysfunction in patients with cardiovascular risk factors. Eur J Neurol 2010; 17:1134-1140. [PMID: 20298426 DOI: 10.1111/j.1468-1331.2010.02990.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Recent studies have shown that the levels of circulating inflammatory markers are associated with cognitive decline and cerebral small-vessel disease. Frontal lobe dysfunction is believed to be a relatively characteristic neuropsychological symptom in vascular cognitive impairment caused by cerebral small-vessel disease. The purpose of this study was to investigate whether the levels of serum inflammatory markers are associated with frontal lobe dysfunction, particularly executive dysfunction. METHODS Between January 2003 and September 2007, 388 patients who had one or more atherosclerotic risk factors and subsequently underwent brain MRI and neuropsychological testing including mini-mental state examination (MMSE), frontal assessment battery (FAB), and modified Stroop test were enrolled in this study. We evaluated the effect of serum levels of inflammatory markers and white matter lesions on frontal lobe function. RESULTS The FAB score was negatively correlated with serum inflammatory marker levels (hsCRP; r = -0.170, IL-6; r = -0.143, IL-18; r = -0.175) and white matter lesions. In the modified Stroop test, interference measure was positively correlated with the levels of hsCRP (r = -0.198), and IL-18 (r = -0.152), and white matter lesions. However, the MMSE score was not correlated with either inflammatory marker levels. The association between hsCRP and FAB score or interference measure remained significant when controlling for other confounding factors and MRI findings. CONCLUSIONS The circulating level of hsCRP is associated with frontal lobe dysfunction in patients with cardiovascular risk factors independent of white matter lesions in brain MRI.
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Affiliation(s)
- T Hoshi
- Department of Neurology, Osaka University Graduate School of Medicine, Osaka.,Department of Stroke Medicine, Osaka Neurological Institute, Osaka
| | - H Yamagami
- Department of Neurology and Stroke Center, Kobe General City Hospital, Kobe, Japan
| | - S Furukado
- Department of Neurology, Osaka University Graduate School of Medicine, Osaka
| | - K Miwa
- Department of Neurology, Osaka University Graduate School of Medicine, Osaka
| | - M Tanaka
- Department of Neurology, Osaka University Graduate School of Medicine, Osaka
| | - M Sakaguchi
- Department of Neurology, Osaka University Graduate School of Medicine, Osaka
| | - S Sakoda
- Department of Neurology, Osaka University Graduate School of Medicine, Osaka
| | - K Kitagawa
- Department of Neurology, Osaka University Graduate School of Medicine, Osaka
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Fujiwara T, Hoshi T, Yamamoto S, Sogabe T, Zhang SL. Novel algorithm of large-scale simultaneous linear equations. J Phys Condens Matter 2010; 22:074206. [PMID: 21386384 DOI: 10.1088/0953-8984/22/7/074206] [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: 05/30/2023]
Abstract
We review our recently developed methods of solving large-scale simultaneous linear equations and applications to electronic structure calculations both in one-electron theory and many-electron theory. This is the shifted COCG (conjugate orthogonal conjugate gradient) method based on the Krylov subspace, and the most important issue for applications is the shift equation and the seed switching method, which greatly reduce the computational cost. The applications to nano-scale Si crystals and the double orbital extended Hubbard model are presented.
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Affiliation(s)
- T Fujiwara
- Center for Research and Development of Higher Education, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8656, Japan
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Abstract
Helical multishell gold nanowires are studied theoretically for the formation mechanism of the helical domain boundary. Nanowires with a wire length of more than 10 nm are relaxed by quantum mechanical molecular dynamics simulation with a tight-binding form Hamiltonian. In the results, non-helical nanowires are transformed into helical ones with the formation of atom pair defects at the domain boundary, where the defective atom pair is moved from an inner shell. Analysis of local electronic structure shows a competitive feature of the energy gain of reconstruction on the wire surface and the energy loss of the defect formation. A simple energy scaling theory gives a general explanation of domain boundary formation.
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Affiliation(s)
- T Hoshi
- Department of Applied Mathematics and Physics, Tottori University, Tottori 680-8550, Japan. Core Research for Evolutional Science and Technology, Japan Science and Technology Agency (CREST-JST), Japan
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Hoshi T, Fujiwara T. Development of the simulation package 'ELSES' for extra-large-scale electronic structure calculation. J Phys Condens Matter 2009; 21:064233. [PMID: 21715935 DOI: 10.1088/0953-8984/21/6/064233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
An early-stage version of the simulation package 'ELSES' (extra-large-scale electronic structure calculation) is developed for simulating the electronic structure and dynamics of large systems, particularly nanometer-scale and ten-nanometer-scale systems (see www.elses.jp). Input and output files are written in the extensible markup language (XML) style for general users. Related pre-/post-simulation tools are also available. A practical workflow and an example are described. A test calculation for the GaAs bulk system is shown, to demonstrate that the present code can handle systems with more than one atom species. Several future aspects are also discussed.
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Affiliation(s)
- T Hoshi
- Department of Applied Mathematics and Physics, Tottori University, Tottori 680-8550, Japan. Core Research for Evolutional Science and Technology, Japan Science and Technology Agency (CREST-JST), Japan
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Shimizu T, Mizutani T, Takahashi S, Hoshi T, Tanaka M. New use of a laryngectomy tube for management of mechanical ventilation in patients with anatomical abnormalities. Br J Anaesth 2008; 100:728-9. [DOI: 10.1093/bja/aen065] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [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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Abstract
Numerical aspects are investigated in ultra-large-scale electronic structure calculations. Accuracy control methods in process (molecular-dynamics) calculations are focused upon. Flexible control methods are proposed so as to control variational freedoms, automatically at each time step, within the framework of generalized Wannier state theory. The method is demonstrated in a silicon cleavage simulation with 10(2)-10(5) atoms. The idea is of general importance among process calculations and is also used in Krylov subspace theory, which is another large-scale calculation theory.
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Abstract
This review is divided into three parts: (a) The primary site of oxygen sensing is the carotid body which instantaneously respond to hypoxia without involving new protein synthesis, and is historically known as the first oxygen sensor and is therefore placed in the first section (Lahiri, Roy, Baby and Hoshi). The carotid body senses oxygen in acute hypoxia, and produces appropriate responses such as increases in breathing, replenishing oxygen from air. How this oxygen is sensed at a relatively high level (arterial PO2 approximately 50 Torr) which would not be perceptible by other cells in the body, is a mystery. This response is seen in afferent nerves which are connected synaptically to type I or glomus cells of the carotid body. The major effect of oxygen sensing is the increase in cytosolic calcium, ultimately by influx from extracellular calcium whose concentration is 2 x 10(4) times greater. There are several contesting hypotheses for this response: one, the mitochondrial hypothesis which states that the electron transport from the substrate to oxygen through the respiratory chain is retarded as the oxygen pressure falls, and the mitochondrial membrane is depolarized leading to the calcium release from the complex of mitochondria-endoplasmic reticulum. This is followed by influx of calcium. Also, the inhibitors of the respiratory chain result in mitochondrial depolarization and calcium release. The other hypothesis (membrane model) states that K(+) channels are suppressed by hypoxia which depolarizes the membrane leading to calcium influx and cytosolic calcium increase. Evidence supports both the hypotheses. Hypoxia also inhibits prolyl hydroxylases which are present in all the cells. This inhibition results in membrane K(+) current suppression which is followed by cell depolarization. The theme of this section covers first what and where the oxygen sensors are; second, what are the effectors; third, what couples oxygen sensors and the effectors. (b) All oxygen consuming cells have a built-in mechanism, the transcription factor HIF-1, the discovery of which has led to the delineation of oxygen-regulated gene expression. This response to chronic hypoxia needs new protein synthesis, and the proteins of these genes mediate the adaptive physiological responses. HIF-1alpha, which is a part of HIF-1, has come to be known as master regulator for oxygen homeostasis, and is precisely regulated by the cellular oxygen concentration. Thus, the HIF-1 encompasses the chronic responses (gene expression in all cells of the body). The molecular biology of oxygen sensing is reviewed in this section (Semenza). (c) Once oxygen is sensed and Ca(2+) is released, the neurotransmittesr will be elaborated from the glomus cells of the carotid body. Currently it is believed that hypoxia facilitates release of one or more excitatory transmitters from glomus cells, which by depolarizing the nearby afferent terminals, leads to increases in the sensory discharge. The transmitters expressed in the carotid body can be classified into two major categories: conventional and unconventional. The conventional neurotransmitters include those stored in synaptic vesicles and mediate their action via activation of specific membrane bound receptors often coupled to G-proteins. Unconventional neurotransmitters are those that are not stored in synaptic vesicles, but spontaneously generated by enzymatic reactions and exert their biological responses either by interacting with cytosolic enzymes or by direct modifications of proteins. The gas molecules such as NO and CO belong to this latter category of neurotransmitters and have unique functions. Co-localization and co-release of neurotransmitters have also been described. Often interactions between excitatory and inhibitory messenger molecules also occur. Carotid body contains all kinds of transmitters, and an interplay between them must occur. But very little has come to be known as yet. Glimpses of these interactions are evident in the discussion in the last section (Prabhakar).
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Affiliation(s)
- S Lahiri
- Department of Physiology, University of Pennsylvania Medical Center, Philadelphia, 19104-6085, USA.
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Gessner G, Schönherr K, Soom M, Hansel A, Asim M, Baniahmad A, Derst C, Hoshi T, Heinemann SH. BKCa Channels Activating at Resting Potential without Calcium in LNCaP Prostate Cancer Cells. J Membr Biol 2006; 208:229-40. [PMID: 16604468 DOI: 10.1007/s00232-005-0830-z] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2005] [Revised: 12/15/2005] [Indexed: 12/23/2022]
Abstract
Large-conductance Ca2+-dependent K+ (BK(Ca)) channels are activated by intracellular Ca2+ and membrane depolarization in an allosteric manner. We investigated the pharmacological and biophysical characteristics of a BK(Ca)-type K+ channel in androgen-dependent LNCaP (lymph node carcinoma of the prostate) cells with novel functional properties, here termed BK(L). K+ selectivity, high conductance, activation by Mg2+ or NS1619, and inhibition by paxilline and penitrem A largely resembled the properties of recombinant BK(Ca) channels. However, unlike conventional BK(Ca) channels, BK(L) channels activated in the absence of free cytosolic Ca2+ at physiological membrane potentials; the half-maximal activation voltage was shifted by about -100 mV compared with BK(Ca) channels. Half-maximal Ca2+-dependent activation was observed at 0.4 microM: for BK(L) (at -20 mV) and at 4.1 microM: for BK(Ca) channels (at +50 mV). Heterologous expression of hSlo1 in LNCaP cells increased the BK(L) conductance. Expression of hSlo-beta1 in LNCaP cells shifted voltage-dependent activation to values between that of BK(L) and BK(Ca) channels and reduced the slope of the P (open) (open probability)-voltage curve. We propose that LNCaP cells harbor a so far unknown type of BK(Ca) subunit, which is responsible for the BK(L) phenotype in a dominant manner. BK(L)-like channels are also expressed in the human breast cancer cell line T47D. In addition, functional expression of BK(L) in LNCaP cells is regulated by serum-derived factors, however not by androgens.
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Affiliation(s)
- G Gessner
- Institute of Molecular Cell Biology, Molecular and Cellular Biophysics, Friedrich Schiller University , Jena, Germany
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Aoyagi S, Hayama M, Hasegawa U, Sakai K, Tozu M, Hoshi T, Kudo M. Estimation of protein adsorption on dialysis membrane by means of TOF-SIMS imaging. J Memb Sci 2004. [DOI: 10.1016/j.memsci.2004.02.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Abstract
BACKGROUND Xenon at two different concentrations (30%, 60%) has no effect on diaphragmatic contractility. This study was undertaken to compare the effects of xenon and nitrous oxide (N2O), a commonly used and well-established gas anesthetic, on diaphragmatic contractility in dogs. METHODS Twenty-one pentobarbitone-anesthetized dogs were randomly divided into three groups of seven each: group 1 received xenon 30% (0.25 MAC) in oxygen; group 2 received N2O 47% (0.25 MAC) in oxygen; and group 3 received N2O 60% (0.32 MAC) in oxygen. Diaphragmatic contractility was assessed by transdiaphragmatic pressure (Pdi) at low- (20-Hz) and high-frequency (100-Hz) stimulation, after maintaining 60 min of stable condition. The integrated electrical activity of diaphragm (Edi) to each stimulus was measured. RESULTS With an inhalation of xenon 30%, N2O 47%, or N2O 60%, Pdi and Edi at both stimuli did not change. No difference in Pdi or Edi was observed among the groups. CONCLUSION When used at clinical concentration, xenon or N2O does not affect contractility and electrical activity of the diaphragm in dogs.
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Affiliation(s)
- T Hoshi
- Department of Anesthesiology, University of Tsukuba Institute of Clinical Medicine, Ibaraki, Japan
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Abstract
BACKGROUND Nucleoside triphosphate diphosphohydrolase-1 (NTPDase1)/CD39 is the major ectonucleotidase of endothelial cells and monocytes and catalyzes phosphohydrolysis of extracellular nucleoside diphosphates (NDP) and triphosphates (NTP, eg, ATP and UTP). Deletion of cd39 causes perturbations in the hydrolysis of NTP and NDP in the vasculature. Activation of P2 receptors appears to influence endothelial cell chemotactic and mitogenic responses in vitro. Therefore, aberrant regulation of nucleotide P2 receptors may influence angiogenesis in cd39-null mice. Methods and Results- In control mice, implanted Matrigel plugs containing growth factors were rapidly populated by monocyte/macrophages, endothelial cells, and pericytes, with the development of new vessels over days. In cd39-null mice, migrating cells were completely confined to the tissue-Matrigel interface in a clearly stratified manner. Absolute failure of new vessel ingrowth was consistently observed in the mutant mice. Linked to these findings, chemotaxis of cd39-null monocyte/macrophages to nucleotides was impaired in vitro. This abnormality was associated with desensitization of nucleotide receptor P2Y-mediated signaling pathways. CONCLUSIONS Our findings demonstrate a role for NTPDase1 and phosphohydrolysis of extracellular nucleotides in the regulation of the cellular infiltration and new vessel growth in a model of angiogenesis.
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MESH Headings
- Acid Anhydride Hydrolases/metabolism
- Adenosine Triphosphatases/genetics
- Adenosine Triphosphatases/physiology
- Adenosine Triphosphate/pharmacology
- Animals
- Antigens/analysis
- Antigens, CD/analysis
- Antigens, CD/genetics
- Antigens, CD/physiology
- Apyrase
- Blood Vessels/chemistry
- Blood Vessels/growth & development
- Cell Movement/physiology
- Chemokine CCL2/pharmacology
- Drug Synergism
- Female
- Genotype
- Immunohistochemistry
- Integrin beta3
- Macrophages/cytology
- Macrophages/drug effects
- Male
- Mice
- Mice, Inbred C57BL
- Mice, Inbred Strains
- Mice, Knockout
- Monocytes/cytology
- Monocytes/drug effects
- Mutation
- Neovascularization, Physiologic/physiology
- Nucleoside-Triphosphatase
- Platelet Endothelial Cell Adhesion Molecule-1/analysis
- Platelet Membrane Glycoproteins/analysis
- Proteoglycans/analysis
- Receptor Protein-Tyrosine Kinases/analysis
- Receptor, Platelet-Derived Growth Factor beta/analysis
- Receptors, Growth Factor/analysis
- Receptors, Vascular Endothelial Growth Factor
- Serotonin/pharmacology
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Affiliation(s)
- C Goepfert
- Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA
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Lu T, Hoshi T, Weintraub NL, Spector AA, Lee HC. Activation of ATP-sensitive K+ channels by epoxyeicosatrienoic acids in rat cardiac ventricular myocytes. J Physiol 2001. [DOI: 10.1113/jphysiol.2001.012896] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
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Lu T, Hoshi T, Weintraub NL, Spector AA, Lee HC. Activation of ATP-sensitive K(+) channels by epoxyeicosatrienoic acids in rat cardiac ventricular myocytes. J Physiol 2001; 537:811-27. [PMID: 11744757 PMCID: PMC2278996 DOI: 10.1111/j.1469-7793.2001.00811.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2001] [Accepted: 09/06/2001] [Indexed: 11/29/2022] Open
Abstract
1. We examined the effects of epoxyeicosatrienoic acids (EETs), which are cytochrome P450 metabolites of arachidonic acid (AA), on the activities of the ATP-sensitive K(+) (K(ATP)) channels of rat cardiac myocytes, using the inside-out patch-clamp technique. 2. In the presence of 100 microM cytoplasmic ATP, the K(ATP) channel open probability (P(o)) was increased by 240 +/- 60 % with 0.1 microM 11,12-EET and by 400 +/- 54 % with 5 microM 11,12-EET (n = 5-10, P < 0.05 vs. control), whereas neither 5 microM AA nor 5 microM 11,12-dihydroxyeicosatrienoic acid (DHET), which is the epoxide hydrolysis product of 11,12-EET, had any effect on P(o). 3. The half-maximal activating concentration (EC(50)) was 18.9 +/- 2.6 nM for 11,12-EET (n = 5) and 19.1 +/- 4.8 nM for 8,9-EET (n = 5, P = n.s. vs. 11,12-EET). Furthermore, 11,12-EET failed to alter the inhibition of K(ATP) channels by glyburide. 4. Application of 11,12-EET markedly decreased the channel sensitivity to cytoplasmic ATP. The half-maximal inhibitory concentration of ATP (IC(50)) was increased from 21.2 +/- 2.0 microM at baseline to 240 +/- 60 microM with 0.1 microM 11,12-EET (n = 5, P < 0.05 vs. control) and to 780 +/- 30 microM with 5 microM 11,12-EET (n = 11, P < 0.05 vs. control). 5. Increasing the ATP concentration increased the number of kinetically distinguishable closed states, promoting prolonged closure durations. 11,12-EET antagonized the effects of ATP on the kinetics of the K(ATP) channels in a dose- and voltage-dependent manner. 11,12-EET (1 microM) reduced the apparent association rate constant of ATP to the channel by 135-fold. 6. Application of 5 microM 11,12-EET resulted in hyperpolarization of the resting membrane potential in isolated cardiac myocytes, which could be blocked by glyburide. 7. These results suggest that EETs are potent activators of the cardiac K(ATP) channels, modulating channel behaviour by reducing the channel sensitivity to ATP. Thus, EETs could be important endogenous regulators of cardiac electrical excitability.
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Affiliation(s)
- T Lu
- Department of Internal Medicine, University of Iowa College of Medicine, Iowa City, IA 52242, USA
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Hoshi T, Saiki H, Kuwazawa S, Tsuchiya C, Chen Q, Anzai JI. Selective permeation of hydrogen peroxide through polyelectrolyte multilayer films and its use for amperometric biosensors. Anal Chem 2001; 73:5310-5. [PMID: 11721934 DOI: 10.1021/ac010605t] [Citation(s) in RCA: 136] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A platinum electrode was coated with polyelectrolyte multilayer (PEM) films to prepare an amperometric hydrogen peroxide sensor which can be used in the presence of possible interferences such as ascorbic acid, uric acid, and acetaminophen. The PEM films were prepared on the surface of a Pt disk electrode by an alternate deposition of polycation and polyanion from the aqueous solutions through electrostatic force of attraction. The Pt electrodes coated with a poly(allylamine)/poly(vinyl sulfate) or poly(allylamine)/poly(styrenesulfonate) film were used successfully for detecting H2O2 selectively in the presence of the possible interfering agents. It was suggested that H2O2 can diffuse into the PEM film smoothly while the ascorbic acid, uric acid, and acetaminophen cannot penetrate the film by a size exclusion mechanism. On the other hand, the electrodes coated with PEM films containing poly(ethyleneimine) or poly(diallyldimethylammonium chloride) were not useful for the selective determination of H2O2. The results were rationalized based on the different permeability of the films due to the different molecular density or packing in the PEM films. The PEM film-coated electrode was useful for constructing glucose biosensors by coupling with glucose oxidase.
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Affiliation(s)
- T Hoshi
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aramaki, Sendai, Japan
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Hoshi T, Yamauchi T, Kanauchi T, Konno M, Imai K, Suwa J, Onoguchi K, Hashimoto K, Horie T. [Three-dimensional computed tomography angiography of coronary artery bypass graft with electron beam tomography]. J Cardiol 2001; 38:197-202. [PMID: 11688426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
OBJECTIVES Assessment of coronary artery bypass graft patency by three-dimensional reconstructed computed tomography angiography (3D-CTA) derived from electrocardiography-gated contrast-enhanced electron beam tomography (EBT) was evaluated. METHODS Thirty-nine patients with 99 grafts (45 arterial grafts and 54 venous grafts) underwent 3D-CTA and selective coronary angiography within a 3-week interval. 3D-CTA images of the coronary bypass grafts were compared with the coronary angiography images used as the control. RESULTS 3D-CTA defined 42 of 44 arterial grafts as patent (sensitivity: 95%), all 47 venous grafts as patent (sensitivity: 100%) and all 7 venous grafts as occlusive (specificity: 100%). The overall sensitivity and specificity were 98% and 88%, respectively. CONCLUSIONS 3D-CTA is an useful noninvasive technique with adequate sensitivity and specificity to assess coronary artery bypass graft patency.
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Affiliation(s)
- T Hoshi
- Department of Radiology, Saitama Cardiovascular and Respiratory Center, Itai 1696, Konan-machi, Osato-gun, Saitama 360-0105
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Yermolaieva O, Chen J, Couceyro PR, Hoshi T. Cocaine- and amphetamine-regulated transcript peptide modulation of voltage-gated Ca2+ signaling in hippocampal neurons. J Neurosci 2001; 21:7474-80. [PMID: 11567037 PMCID: PMC6762924] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023] Open
Abstract
Administration of cocaine and amphetamine increases cocaine- and amphetamine-regulated transcript (CART) expression in the rat striatum (Douglass et al., 1995). CART mRNA is highly expressed in different parts of the human and rat brain, including hippocampus (Douglass et al., 1995; Couceyro et al., 1997; Kuhar and Yoho, 1999; Hurd and Fagergren, 2000). The presence of CART peptide 55-102 immunoreactivity in dense core vesicles of axon terminals suggests that the peptide may be released and may act as a neuromodulator (Smith et al., 1997) to induce neurophysiological and behavioral effects. Little is known, however, about CART peptide-responsive cells, receptor(s), or intracellular signaling mechanisms that mediate CART peptide action. Here we show that CART peptide 55-102 inhibits voltage-dependent intracellular Ca(2+) signaling and attenuates cocaine enhancement of depolarization-induced Ca(2+) influx in rat hippocampal neurons. The inhibitory effect of CART peptide 55-102 on Ca(2+) signaling is likely mediated by an inhibition of L-type voltage-gated Ca(2+) channel activity via a G-protein-dependent pathway. These results indicate that voltage-gated Ca(2+) channels in hippocampal neurons are targets for CART peptide 55-102 and suggest that CART peptides may be important in physiology and behavior mediated by the hippocampus, such as certain forms of learning and memory.
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Affiliation(s)
- O Yermolaieva
- Department of Physiology and Biophysics, University of Iowa, Iowa City, Iowa 52242, USA
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Takasawa M, Watanabe M, Yamamoto S, Hoshi T, Kajimoto K, Kinoshita N. "Schistotaxis" in cerebral blood flow on 99mTc-HMPAO single-photon emission computed tomography during a seizure following a stroke. Neuroradiology 2001; 43:821-3. [PMID: 11688696 DOI: 10.1007/s002340100590] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We describe a patient with seizures following a stroke in whom on ictal 99mTc-HMPAO single-photon emission computed tomography demonstrated cerebral blood flow "schistotaxis", i.e., focal hyperaemia corresponding to an epileptogenic focus together with an extensive hypoperfused area in the same hemisphere. This phenomenon may have been caused by haemodynamic alternation and a remote transneural effect during the seizures.
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Affiliation(s)
- M Takasawa
- Department of Internal Medicine and Therapeutics, Osaka University Graduate School of Medicine, Suita City, Japan.
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Davare MA, Avdonin V, Hall DD, Peden EM, Burette A, Weinberg RJ, Horne MC, Hoshi T, Hell JW. A beta2 adrenergic receptor signaling complex assembled with the Ca2+ channel Cav1.2. Science 2001; 293:98-101. [PMID: 11441182 DOI: 10.1126/science.293.5527.98] [Citation(s) in RCA: 408] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The existence of a large number of receptors coupled to heterotrimeric guanine nucleotide binding proteins (G proteins) raises the question of how a particular receptor selectively regulates specific targets. We provide insight into this question by identifying a prototypical macromolecular signaling complex. The beta(2) adrenergic receptor was found to be directly associated with one of its ultimate effectors, the class C L-type calcium channel Ca(v)1.2. This complex also contained a G protein, an adenylyl cyclase, cyclic adenosine monophosphate-dependent protein kinase, and the counterbalancing phosphatase PP2A. Our electrophysiological recordings from hippocampal neurons demonstrate highly localized signal transduction from the receptor to the channel. The assembly of this signaling complex provides a mechanism that ensures specific and rapid signaling by a G protein-coupled receptor.
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Affiliation(s)
- M A Davare
- Department of Pharmacology, University of Wisconsin, Madison, WI 53706, USA
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