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Nakada T, Kozawa T, Seino S, Murota S, Eto M, Shimasawa J, Shimizu Y, Tsurugano S, Katsukawa F, Sakamoto K, Washizaki H, Ishigaki Y, Sakamoto M, Takadama K, Yanai K, Matsuo O, Kameue C, Suzuki H, Kurotani K, Ohkawara K. A Community-Based Intervention to Enhance Subjective Well-Being in Older Adults: Study Design and Baseline Participant Profiles. Healthcare (Basel) 2024; 12:322. [PMID: 38338206 PMCID: PMC10855773 DOI: 10.3390/healthcare12030322] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 01/16/2024] [Accepted: 01/25/2024] [Indexed: 02/12/2024] Open
Abstract
Promoting subjective well-being is a crucial challenge in aging societies. In 2022, we launched a community-based intervention trial (the Chofu-Digital-Choju Movement). This initiative centered on fostering in-person and online social connections to enhance the subjective well-being of older adults. This paper describes the study design and baseline survey. This quasi-experimental study involved community-dwelling older adults aged 65-84 years in Chofu City, Tokyo, Japan. A self-administered questionnaire was distributed to 3742 residents (1681 men and 2061 women), and a baseline survey was conducted in January 2022. We assessed subjective well-being (primary outcome); psychosocial, physical, and dietary factors; and the use of information and communication technology variables (secondary outcomes) among the participants. After the intervention involving online classes, community hubs, and community events, a 2-year follow-up survey will be conducted to evaluate the effects of the intervention, comparing the intervention group (participants) with the control group (non-participants). We received 2503 questionnaires (66.9% response rate); of these, the analysis included 2343 questionnaires (62.6% valid response rate; mean age, 74.4 (standard deviation, 5.4) years; 43.7% male). The mean subjective well-being score was 7.2 (standard deviation, 1.9). This study will contribute to the development of a prototype subjective well-being strategy for older adults.
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Affiliation(s)
- Tsubasa Nakada
- Graduate School of Informatics and Engineering, The University of Electro-Communications, Tokyo 182-8585, Japan
| | - Takako Kozawa
- Faculty of Human Health, Komazawa Women’s University, Tokyo 206-8511, Japan
| | - Satoshi Seino
- Research Team for Social Participation and Healthy Aging, Tokyo Metropolitan Institute for Geriatrics and Gerontology, Tokyo 173-0015, Japan
| | - Shinichi Murota
- Faculty of Humanities and Social Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Miki Eto
- Faculty of Human Sciences, Osaka University of Economics, Osaka 533-8533, Japan
| | - Junko Shimasawa
- School of Nursing, The Jikei University, Tokyo 182-8570, Japan
| | - Yumiko Shimizu
- School of Nursing, The Jikei University, Tokyo 182-8570, Japan
| | - Shinobu Tsurugano
- Center for Health Sciences and Counseling, Kyushu University, Fukuoka 819-0395, Japan
| | - Fuminori Katsukawa
- Sports Medicine Research Center, Keio University, Yokohama 223-8521, Japan
| | - Kazunori Sakamoto
- Green Computing Systems Research Organization, Waseda University, Tokyo 169-8050, Japan
| | - Hironori Washizaki
- Faculty of Science and Engineering, School of Fundamental Science and Engineering, Waseda University, Tokyo 169-8050, Japan
| | - Yo Ishigaki
- Research Center for Realizing Sustainable Societies, The University of Electro-Communications, Tokyo 182-8585, Japan
| | - Maki Sakamoto
- Graduate School of Informatics and Engineering, The University of Electro-Communications, Tokyo 182-8585, Japan
| | - Keiki Takadama
- Graduate School of Informatics and Engineering, The University of Electro-Communications, Tokyo 182-8585, Japan
| | - Keiji Yanai
- Graduate School of Informatics and Engineering, The University of Electro-Communications, Tokyo 182-8585, Japan
| | - Osamu Matsuo
- Graduate School of Informatics and Engineering, The University of Electro-Communications, Tokyo 182-8585, Japan
| | - Chiyoko Kameue
- Graduate School of Informatics and Engineering, The University of Electro-Communications, Tokyo 182-8585, Japan
| | - Hitomi Suzuki
- Office for Research Strategy, The University of Electro-Communications, Tokyo 182-8585, Japan
| | - Kayo Kurotani
- Faculty of Food and Health Sciences, Showa Women’s University, Tokyo 154-8533, Japan
| | - Kazunori Ohkawara
- Graduate School of Informatics and Engineering, The University of Electro-Communications, Tokyo 182-8585, Japan
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Benitez-Garcia G, Takahashi H, Yanai K. Material Translation Based on Neural Style Transfer with Ideal Style Image Retrieval. Sensors (Basel) 2022; 22:s22197317. [PMID: 36236415 PMCID: PMC9573044 DOI: 10.3390/s22197317] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 09/22/2022] [Accepted: 09/23/2022] [Indexed: 05/27/2023]
Abstract
The field of Neural Style Transfer (NST) has led to interesting applications that enable us to transform reality as human beings perceive it. Particularly, NST for material translation aims to transform the material of an object into that of a target material from a reference image. Since the target material (style) usually comes from a different object, the quality of the synthesized result totally depends on the reference image. In this paper, we propose a material translation method based on NST with automatic style image retrieval. The proposed CNN-feature-based image retrieval aims to find the ideal reference image that best translates the material of an object. An ideal reference image must share semantic information with the original object while containing distinctive characteristics of the desired material (style). Thus, we refine the search by selecting the most-discriminative images from the target material, while focusing on object semantics by removing its style information. To translate materials to object regions, we combine a real-time material segmentation method with NST. In this way, the material of the retrieved style image is transferred to the segmented areas only. We evaluate our proposal with different state-of-the-art NST methods, including conventional and recently proposed approaches. Furthermore, with a human perceptual study applied to 100 participants, we demonstrate that synthesized images of stone, wood, and metal can be perceived as real and even chosen over legitimate photographs of such materials.
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Affiliation(s)
- Gibran Benitez-Garcia
- Graduate School of Informatics and Engineering, The University of Electro-Communications, Chofugaoka 1-5-1, Chofu-shi 182-8585, Japan
| | - Hiroki Takahashi
- Graduate School of Informatics and Engineering, The University of Electro-Communications, Chofugaoka 1-5-1, Chofu-shi 182-8585, Japan
- Artificial Intelligence eXploration Research Center, The University of Electro-Communications, Chofugaoka 1-5-1, Chofu-shi 182-8585, Japan
| | - Keiji Yanai
- Graduate School of Informatics and Engineering, The University of Electro-Communications, Chofugaoka 1-5-1, Chofu-shi 182-8585, Japan
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Ezura M, Kikuchi A, Ishiki A, Okamura N, Hasegawa T, Harada R, Watanuki S, Funaki Y, Hiraoka K, Baba T, Sugeno N, Oshima R, Yoshida S, Kobayashi J, Kobayashi M, Tano O, Nakashima I, Mugikura S, Iwata R, Taki Y, Furukawa K, Arai H, Furumoto S, Tashiro M, Yanai K, Kudo Y, Takeda A, Aoki M. Longitudinal changes in 18 F-THK5351 positron emission tomography in corticobasal syndrome. Eur J Neurol 2019; 26:1205-1211. [PMID: 30980575 DOI: 10.1111/ene.13966] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [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: 12/05/2018] [Accepted: 04/04/2019] [Indexed: 12/01/2022]
Abstract
BACKGROUND AND PURPOSE Corticobasal syndrome (CBS) is pathologically characterized by tau deposits in neuronal and glial cells and by reactive astrogliosis. In several neurodegenerative disorders, 18 F-THK5351 has been observed to bind to reactive astrocytes expressing monoamine oxidase B. In this study, the aim was to investigate the progression of disease-related pathology in the brains of patients with CBS using positron emission tomography with 18 F-THK5351. METHODS Baseline and 1-year follow-up imaging were acquired using magnetic resonance imaging and positron emission tomography with 18 F-THK5351 in 10 subjects: five patients with CBS and five age-matched normal controls (NCs). RESULTS The 1-year follow-up scan images revealed that 18 F-THK5351 retention had significantly increased in the superior parietal gyrus of the patients with CBS compared with the NCs. The median increases in 18 F-THK5351 accumulation in the patients with CBS were 6.53% in the superior parietal gyrus, 4.34% in the precentral gyrus and 4.33% in the postcentral gyrus. In contrast, there was no significant increase in the regional 18 F-THK5351 retention in the NCs. CONCLUSIONS Longitudinal increases in 18 F-THK5351 binding can be detected over a short interval in the cortical sites of patients with CBS. A monoamine oxidase B binding radiotracer could be useful in monitoring the progression of astrogliosis in CBS.
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Affiliation(s)
- M Ezura
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - A Kikuchi
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - A Ishiki
- Department of Geriatrics and Gerontology, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan
| | - N Okamura
- Division of Pharmacology, Faculty of Medicine, Tohoku Medical and Pharmaceutical University, Sendai, Japan.,Department of Pharmacology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - T Hasegawa
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - R Harada
- Department of Pharmacology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - S Watanuki
- Division of Cyclotron Nuclear Medicine, Cyclotron and Radioisotope Center, Tohoku University, Sendai, Japan
| | - Y Funaki
- Division of Radiopharmaceutical Chemistry, Cyclotron and Radioisotope Center, Tohoku University, Sendai, Japan
| | - K Hiraoka
- Division of Cyclotron Nuclear Medicine, Cyclotron and Radioisotope Center, Tohoku University, Sendai, Japan
| | - T Baba
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - N Sugeno
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - R Oshima
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - S Yoshida
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - J Kobayashi
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - M Kobayashi
- Department of Neurology, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - O Tano
- Department of Neurology, Sendai Medical Center, Sendai, Japan
| | - I Nakashima
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan.,Department of Neurology, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - S Mugikura
- Department of Diagnostic Radiology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - R Iwata
- Division of Radiopharmaceutical Chemistry, Cyclotron and Radioisotope Center, Tohoku University, Sendai, Japan
| | - Y Taki
- Department of Nuclear Medicine and Radiology, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan
| | - K Furukawa
- Department of Geriatrics and Gerontology, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan.,Division of Community of Medicine, Faculty of Medicine, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - H Arai
- Department of Geriatrics and Gerontology, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan
| | - S Furumoto
- Division of Radiopharmaceutical Chemistry, Cyclotron and Radioisotope Center, Tohoku University, Sendai, Japan
| | - M Tashiro
- Division of Cyclotron Nuclear Medicine, Cyclotron and Radioisotope Center, Tohoku University, Sendai, Japan
| | - K Yanai
- Department of Pharmacology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Y Kudo
- Division of Neuroimaging, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan
| | - A Takeda
- Department of Neurology, National Hospital Organization, Sendai Nishitaga Hospital, Sendai, Japan
| | - M Aoki
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
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Fujii T, Yanai K, Tokuda S, Nakazawa Y, Kurozumi S, Obayashi S, Yajima R, Hirakata T. Abstract P2-08-28: Relationship between FDG uptake and neutrophil/lymphocyte ratio in patients with breast invasive ductal cancer. Cancer Res 2019. [DOI: 10.1158/1538-7445.sabcs18-p2-08-28] [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: 11/16/2022]
Abstract
Abstract
Background: 18F-Fluorodeoxyglucose-positron emission tomography (FDG-PET) is used to evaluate the glucose metabolic rates of cancers. Several studies have reported that high FDG uptake is predictive of poor prognosis and aggressive features in patients with breast cancer. FDG uptake is influenced by many factors, including inflammation. In this study, we investigated the relationship between FDG uptake and neutrophil/lymphocyte ratio (NLR), which is an indicator of systemic inflammation. Patients and Methods: We retrospectively investigated the cases of 143 consecutive invasive ductal carcinoma patients who had undergone surgery and FDG-PET preoperatively.PET was evaluated using standardized uptake value max (SUVmax). The median SUVmax was 2.5 (range 0-10.5). Thus, we divided the cases into two groups based on the value of SUVmax; low (<2.5) and high (≥2.5). The relationships between SUVmax and clinicopathological features, including NLR, were investigated. Results: Among the143 patients, 73 (51.0%) had high SUVmax in the primary tumor. The analysis revealed that large tumor size (p<0.001), high nuclear grade (p<0.001), the presence of lymphovascular invasion (p<0.001), CRP (p=0.046) and high NLR (p<0.001) were significantly associated with high SUVmax in the primary tumor. There were associations between SUVmax and NLR (r=0.323, p<0.001). Among the 70 cases with low SUVmax, there was no recurrent disease, while 6 cases among the 73 cases with high SUVmax had disease recurrence. It is interesting to note that the group with high SUVmax and low NLR had no recurrent disease. Conclusions: To the best of our knowledge, this is the first report to describe the relationship between FDG uptake and NLR in breast cancer. The present study demonstrated that the finding of preoperative high FDG uptake in breast cancer may be reflective of poor prognosis and that high NLR may be predictive of aggressive features among patients with breast cancer. On the other hand, among breast cancer patients with high SUVmax in the primary tumor, it will be useful to identify the subset of patients with low NLR in order to improve prognostic accuracy.
Citation Format: Fujii T, Yanai K, Tokuda S, Nakazawa Y, Kurozumi S, Obayashi S, Yajima R, Hirakata T. Relationship between FDG uptake and neutrophil/lymphocyte ratio in patients with breast invasive ductal cancer [abstract]. In: Proceedings of the 2018 San Antonio Breast Cancer Symposium; 2018 Dec 4-8; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2019;79(4 Suppl):Abstract nr P2-08-28.
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Affiliation(s)
- T Fujii
- Gunma University, Maebashi, Japan
| | - K Yanai
- Gunma University, Maebashi, Japan
| | - S Tokuda
- Gunma University, Maebashi, Japan
| | | | | | | | - R Yajima
- Gunma University, Maebashi, Japan
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Hirakata T, Fijii T, Kaira K, Kurozumi S, Katayama A, Yajima R, Obayashi S, NaKazawa Y, Tokuda S, Yanai K, Shirabe K. Abstract PD4-08: Relationship between FDG-uptake and expression level of PD-L1 in primary ER positive/HER2 negative breast cancer. Cancer Res 2019. [DOI: 10.1158/1538-7445.sabcs18-pd4-08] [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: 11/16/2022]
Abstract
Abstract
Background: 18F-Fluorodeoxyglucose-positron emission tomography (FDG-PET) is used to evaluate the glucose metabolic rates of cancers. Several studies have reported that high FDG uptake is predictive of poor prognosis and aggressive features in patients with breast cancer (BC). FDG-uptake is influenced by many factors including inflammation. In this study, we investigated the relationship between FDG uptake and immunological factors, including degrees of stromal tumor-infiltrating lymphocytes (TILs), CD8 and programmed cell death ligand 1 (PD-L1) in ER positive/HER2 negative (ER+/HER2-) BC. No published study, to our knowledge, has assessed the association between FDG uptake and PD-L1 in BC cases, even though both represent prognosis. Methods: Invasive carcinoma tissues of 79 ER+/HER2- BC patients who underwent surgery without preoperative therapy were examined. PD-L1, CD8 and TILs expression were evaluated by immunohistochemically (IHC) method. The evaluation of PET was determined by standardized uptake value max (SUVmax). Multivariate linear regression analysis, including expression of PD-L1, CD8 and TILs, was performed to identify independent variable correlation with SUVmax. Results: Among the 79 ER+/HER2- BC (T1-4, N0-2, M0) patients, the analysis revealed that PD-L1 (P=0.005), lymphovascular invasion (P=0.011), large tumor size (p=0.001), lymph node meatstasis (P=0.010), and high nuclear grade (P=0.011) and premenopasal status (P=0.014) were significantly associated with high SUVmax in the primary tumor. To define predictive value for the expression of PD-L1, SUVmax cut offwas determined using receiver operating characteristic (ROC) analysis; low (<3.0) and high (≥3.0). Among the 30 cases with high SUVmax, 10 cases (33.3%) had PD-L1 positive expression in the primary tumor, while only 2 (4.1%) of the 49 cases with low SUVmax had PD-L1 positive expression in the primary tumor. Conclusions: The present study demonstrated that the finding of preoperative FDG uptake is associated with the expression of PD-L1 in ER+/HER2- BC. In light of our results, FDG uptake may be predictive of the expression of PD-L1 and may be reflective of immunological features as well as prognostic features among patients with ER+/HER2- BC.
Citation Format: Hirakata T, Fijii T, Kaira K, Kurozumi S, Katayama A, Yajima R, Obayashi S, NaKazawa Y, Tokuda S, Yanai K, Shirabe K. Relationship between FDG-uptake and expression level of PD-L1 in primary ER positive/HER2 negative breast cancer [abstract]. In: Proceedings of the 2018 San Antonio Breast Cancer Symposium; 2018 Dec 4-8; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2019;79(4 Suppl):Abstract nr PD4-08.
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Affiliation(s)
- T Hirakata
- Gunma University, Maebashi, Gunma, Japan; Diagnostic Pathology, Gunma University, Maebashi, Gunma, Japan
| | - T Fijii
- Gunma University, Maebashi, Gunma, Japan; Diagnostic Pathology, Gunma University, Maebashi, Gunma, Japan
| | - K Kaira
- Gunma University, Maebashi, Gunma, Japan; Diagnostic Pathology, Gunma University, Maebashi, Gunma, Japan
| | - S Kurozumi
- Gunma University, Maebashi, Gunma, Japan; Diagnostic Pathology, Gunma University, Maebashi, Gunma, Japan
| | - A Katayama
- Gunma University, Maebashi, Gunma, Japan; Diagnostic Pathology, Gunma University, Maebashi, Gunma, Japan
| | - R Yajima
- Gunma University, Maebashi, Gunma, Japan; Diagnostic Pathology, Gunma University, Maebashi, Gunma, Japan
| | - S Obayashi
- Gunma University, Maebashi, Gunma, Japan; Diagnostic Pathology, Gunma University, Maebashi, Gunma, Japan
| | - Y NaKazawa
- Gunma University, Maebashi, Gunma, Japan; Diagnostic Pathology, Gunma University, Maebashi, Gunma, Japan
| | - S Tokuda
- Gunma University, Maebashi, Gunma, Japan; Diagnostic Pathology, Gunma University, Maebashi, Gunma, Japan
| | - K Yanai
- Gunma University, Maebashi, Gunma, Japan; Diagnostic Pathology, Gunma University, Maebashi, Gunma, Japan
| | - K Shirabe
- Gunma University, Maebashi, Gunma, Japan; Diagnostic Pathology, Gunma University, Maebashi, Gunma, Japan
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Honda C, Katayama A, Kurozumi S, Fujii T, Tokiniwa H, Hirakata T, Yajima R, Obayashi S, Nakazawa Y, Tokuda S, Yanai K, Oyama T, Kuwano H. Power of Topoisomerase II-alfa (TOPO2A) as a prognostic factor for Luminal B-like breast cancer at low expression of tumor infiltrating lymphocytes (TILs). Eur J Cancer 2018. [DOI: 10.1016/s0959-8049(18)30620-8] [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: 10/17/2022]
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Yokoi T, Watanabe H, Aya O, Kawabata K, Imai K, Hara K, Masuda M, Ohdake R, Yamaguchi H, Miyao S, Katsuno M, Okamura N, Yanai K, Sobue G. The spatial accumulation patterns in normal elderly using 18F-THK5351 pet. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2704] [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: 10/18/2022]
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Mougiakakou S, Farinella GM, Yanai K, Sazonov E. Guest Editorial Nutrition Informatics: From Food Monitoring to Dietary Management. IEEE J Biomed Health Inform 2017. [DOI: 10.1109/jbhi.2017.2694938] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Ishiki A, Harada R, Okamura N, Tomita N, Rowe CC, Villemagne VL, Yanai K, Kudo Y, Arai H, Furumoto S, Tashiro M, Furukawa K. Tau imaging with [18F]THK-5351 in progressive supranuclear palsy. Eur J Neurol 2016; 24:130-136. [DOI: 10.1111/ene.13164] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Accepted: 08/29/2016] [Indexed: 12/26/2022]
Affiliation(s)
- A. Ishiki
- Department of Geriatrics and Gerontology; Institute of Development, Aging and Cancer; Tohoku University; Sendai Japan
| | - R. Harada
- Division of Neuro-imaging; Institute of Development, Aging and Cancer; Tohoku University; Sendai Japan
| | - N. Okamura
- Department of Pharmacology; Tohoku University School of Medicine; Sendai Japan
- Division of Pharmacology; Faculty of Medicine; Tohoku Medical and Pharmaceutical University; Sendai Japan
| | - N. Tomita
- Department of Geriatrics and Gerontology; Institute of Development, Aging and Cancer; Tohoku University; Sendai Japan
| | - C. C. Rowe
- Centre for PET; Austin Health; Heidelberg Victoria Australia
| | - V. L. Villemagne
- Centre for PET; Austin Health; Heidelberg Victoria Australia
- The Florey Institute of Neuroscience and Mental Health; The University of Melbourne; Melbourne Victoria Australia
| | - K. Yanai
- Department of Pharmacology; Tohoku University School of Medicine; Sendai Japan
| | - Y. Kudo
- Division of Neuro-imaging; Institute of Development, Aging and Cancer; Tohoku University; Sendai Japan
| | - H. Arai
- Department of Geriatrics and Gerontology; Institute of Development, Aging and Cancer; Tohoku University; Sendai Japan
| | - S. Furumoto
- Division of Radiopharmaceutical Chemistry; Cyclotron and Radioisotope Center; Tohoku University; Sendai Japan
| | - M. Tashiro
- Division of Cyclotron Nuclear Medicine; Cyclotron and Radioisotope Center; Tohoku University; Sendai Japan
| | - K. Furukawa
- Department of Geriatrics and Gerontology; Institute of Development, Aging and Cancer; Tohoku University; Sendai Japan
- Division of Community of Medicine; Faculty of Medicine; Tohoku Medical and Pharmaceutical University; Sendai Japan
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Sato K, Shidahara M, Watabe H, Watanuki S, Ishikawa Y, Arakawa Y, Nai YH, Furumoto S, Tashiro M, Shoji T, Yanai K, Gonda K. Performance evaluation of the small-animal PET scanner ClairvivoPET using NEMA NU 4-2008 Standards. Phys Med Biol 2015; 61:696-711. [PMID: 26716872 DOI: 10.1088/0031-9155/61/2/696] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The aim of this study was to evaluate the performance of ClairvivoPET using NEMA NU4 standards. The ClairvivoPET incorporates a LYSO dual depth-of-interaction detector system with 151 mm axial field of view (FOV). Spatial resolution, sensitivity, counting rate capabilities, and image quality were evaluated using NEMA NU4-2008 standards. Normal mouse imaging was also performed for 10 min after intravenous injection of (18)F(-)-NaF. Data were compared with 19 other preclinical PET scanners. Spatial resolution measured using full width at half maximum on FBP-ramp reconstructed images was 2.16 mm at radial offset 5 mm of the axial centre FOV. The maximum absolute sensitivity for a point source at the FOV centre was 8.72%. Peak noise equivalent counting rate (NECR) was 415 kcps at 14.6 MBq ml(-1). The uniformity with the image-quality phantom was 4.62%. Spillover ratios in the images of air and water filled chambers were 0.19 and 0.06, respectively. Our results were comparable with the 19 other preclinical PET scanners based on NEMA NU4 standards, with excellent sensitivity because of the large FOV. The ClairvivoPET with iterative reconstruction algorithm also provided sufficient visualization of the mouse spine. The high sensitivity and resolution of the ClairvivoPET scanner provided high quality images for preclinical studies.
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Affiliation(s)
- K Sato
- Department of Medical Physics, Tohoku University Graduate School of Medicine, Sendai, Japan. Department of Radiology, Hachinohe National Hospital, Hachinohe, Japan
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Kézsmárki I, Bordács S, Milde P, Neuber E, Eng LM, White JS, Rønnow HM, Dewhurst CD, Mochizuki M, Yanai K, Nakamura H, Ehlers D, Tsurkan V, Loidl A. Néel-type skyrmion lattice with confined orientation in the polar magnetic semiconductor GaV4S8. Nat Mater 2015; 14:1116-1122. [PMID: 26343913 DOI: 10.1038/nmat4402] [Citation(s) in RCA: 142] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Accepted: 07/21/2015] [Indexed: 06/05/2023]
Abstract
Following the early prediction of the skyrmion lattice (SkL)--a periodic array of spin vortices--it has been observed recently in various magnetic crystals mostly with chiral structure. Although non-chiral but polar crystals with Cnv symmetry were identified as ideal SkL hosts in pioneering theoretical studies, this archetype of SkL has remained experimentally unexplored. Here, we report the discovery of a SkL in the polar magnetic semiconductor GaV4S8 with rhombohedral (C3v) symmetry and easy axis anisotropy. The SkL exists over an unusually broad temperature range compared with other bulk crystals and the orientation of the vortices is not controlled by the external magnetic field, but instead confined to the magnetic easy axis. Supporting theory attributes these unique features to a new Néel-type of SkL describable as a superposition of spin cycloids in contrast to the Bloch-type SkL in chiral magnets described in terms of spin helices.
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Affiliation(s)
- I Kézsmárki
- Department of Physics, Budapest University of Technology and Economics and MTA-BME Lendület Magneto-optical Spectroscopy Research Group, 1111 Budapest, Hungary
- Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany
| | - S Bordács
- Department of Physics, Budapest University of Technology and Economics and MTA-BME Lendület Magneto-optical Spectroscopy Research Group, 1111 Budapest, Hungary
| | - P Milde
- Institut für Angewandte Photophysik, TU Dresden, D-01069 Dresden, Germany
| | - E Neuber
- Institut für Angewandte Photophysik, TU Dresden, D-01069 Dresden, Germany
| | - L M Eng
- Institut für Angewandte Photophysik, TU Dresden, D-01069 Dresden, Germany
| | - J S White
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - H M Rønnow
- Laboratory for Quantum Magnetism, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - C D Dewhurst
- Institut Laue-Langevin, 6 rue Jules Horowitz 38042 Grenoble, France
| | - M Mochizuki
- Department of Physics and Mathematics, Aoyama Gakuin University, Sagamihara, Kanagawa 229-8558, Japan
- PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - K Yanai
- Department of Physics and Mathematics, Aoyama Gakuin University, Sagamihara, Kanagawa 229-8558, Japan
| | - H Nakamura
- Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501, Japan
| | - D Ehlers
- Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany
| | - V Tsurkan
- Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany
- Institute of Applied Physics, Academy of Sciences of Moldova, MD 2028, Chisinau, Republica Moldova
| | - A Loidl
- Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany
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Kawano Y, Yanai K. Automatic Expansion of a Food Image Dataset Leveraging Existing Categories with Domain Adaptation. Computer Vision - ECCV 2014 Workshops 2015. [DOI: 10.1007/978-3-319-16199-0_1] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Nakamura T, Yoshikawa T, Noguchi N, Sugawara A, Kasajima A, Sasano H, Yanai K. The expression and function of histamine H₃ receptors in pancreatic beta cells. Br J Pharmacol 2014; 171:171-85. [PMID: 24117016 DOI: 10.1111/bph.12429] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2013] [Revised: 09/06/2013] [Accepted: 09/16/2013] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND AND PURPOSE Histamine and its receptors in the CNS play important roles in energy homeostasis. Here, we have investigated the expression and role of histamine receptors in pancreatic beta cells, which secrete insulin. EXPERIMENTAL APPROACH The expression of histamine receptors in pancreatic beta cells was examined by RT-PCR, Western blotting and immunostaining. Insulin secretion assay, ATP measurement and calcium imaging studies were performed to determine the function and signalling pathway of histamine H₃ receptors in glucose-induced insulin secretion (GIIS) from MIN6 cells, a mouse pancreatic beta cell line. The function and signalling pathway of H₃ receptors in MIN6 cell proliferation were examined using pharmacological assay and Western blotting. KEY RESULTS Histamine H₃ receptors were expressed in pancreatic beta cells. A selective H₃ receptor agonist, imetit, and a selective inverse H₃ receptor agonist, JNJ-5207852, had inhibitory and facilitatory effects, respectively, on GIIS in MIN6 cells. Neither imetit nor JNJ-5207852 altered intracellular ATP concentration, or intracellular calcium concentration stimulated by glucose and KCl, indicating that GIIS signalling was affected by H3 receptor signalling downstream of the increase in intracellular calcium concentration. Moreover, imetit attenuated bromodeoxyuridine incorporation in MIN6 cells. The phosphorylation of cAMP response element-binding protein (CREB), which facilitated beta cell proliferation, was inhibited, though not significantly, by imetit, indicating that activated H₃ receptors inhibited MIN6 cell proliferation, possibly by decreasing CREB phosphorylation. CONCLUSIONS AND IMPLICATIONS Histamine H₃ receptors were expressed in mouse beta cells and could play a role in insulin secretion and, possibly, beta cell proliferation.
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Affiliation(s)
- T Nakamura
- Department of Pharmacology, Tohoku University Graduate School of Medicine, Sendai, Japan
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Liou CM, Yanai K, Horiuchi H, Takagi M. Transformation of a Leu−Mutant ofRhizopus niveuswith theleuAGene ofMucor circinelloides. Biosci Biotechnol Biochem 2014; 56:1503-4. [PMID: 1368957 DOI: 10.1271/bbb.56.1503] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- C M Liou
- Department of Agricultural Chemistry, University of Tokyo, Japan
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Denda T, Nishi T, Yamaguchi K, Kenji A, Miyata Y, Yamanaka Y, Yanai K, Hamamoto Y, Nagase M, Fujii H. A Phase II Study of the Panitumumab+ Irinotecan Therapy for Advanced / Recurrence Colorectal Cancer (Topic Study). Ann Oncol 2013. [DOI: 10.1093/annonc/mdt459.51] [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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17
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Suzuki H, Sumiyoshi A, Matsumoto Y, Yoshikawa T, Fukumoto Y, Yanai K, Taki Y, Kawashima R, Shimokawa H. Structural abnormality of the hippocampus and depressive symptoms in a rat model of heart failure. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht307.p638] [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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18
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Villemagne VL, Furumoto S, Fodero-Tavoletti M, Mulligan R, Jones G, Piguet O, Hodges J, Kudo Y, Masters C, Yanai K, Rowe C, Okamura N. 81 In vivo tau imaging with PET. Neurobiol Aging 2012. [DOI: 10.1016/j.neurobiolaging.2012.01.099] [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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Hiraoka K, Okamura N, Funaki Y, Hayashi A, Tashiro M, Hisanaga K, Fujii T, Takeda A, Yanai K, Iwata R, Mori E. Cholinergic Deficit and Response to Donepezil Therapy in Parkinson's Disease with Dementia: [5-11C-Methoxy]donepezil-PET Study (P04.189). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p04.189] [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: 11/15/2022] Open
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Abstract
OBJECTIVE To conduct a systematic review of evidence supporting the safety profiles of frequently used oral H(1)-antihistamines (AHs) for the treatment of patients with histamine-release related allergic diseases, e.g. allergic rhinitis and urticaria, and to compare them to the safety profiles of other medications, mostly topical corticosteroids and leukotriene antagonists (LTRA). RESEARCH DESIGN AND METHODS Systematic search of the published literature (PubMed) and of the regulatory authorities databases (EMA and FDA) for oral AHs. RESULTS Similarly to histamine, antihistamines (AHs) have organ-specific efficacy and adverse effects. The peripheral H(1)-receptor (PrH1R) stimulation leads to allergic symptoms while the brain H(1)-receptor (BrH1R) blockade leads to somnolence, fatigue, increased appetite, decreased cognitive functions (impaired memory and learning), seizures, aggressive behaviour, etc. First-generation oral AHs (FGAHs) inhibit the effects of histamine not only peripherally but also in the brain, and additionally have potent antimuscarinic, anti-α-adrenergic and antiserotonin effects leading to symptoms such as visual disturbances (mydriasis, photophobia, and diplopia), dry mouth, tachycardia, constipation, urinary retention, agitation, and confusion. The somnolence caused by FGAHs interferes with the natural circadian sleep-wake cycle and therefore FGAHs are not suitable to be used as sleeping pills. Second-generation oral AHs (SGAHs) have proven better safety and tolerability profiles, much lower proportional impairment ratios, with at least similar if not better efficacy, than their predecessors. Only SGAHs, and especially those with a proven long-term (e.g., ≥12 months) clinical safety, should be prescribed for young children. Evidence exist that intranasally applied medications, like intranasal antihistamines, have the potential to reach the brain and cause somnolence. CONCLUSIONS Second-generation oral antihistamines are the preferred first-line treatment option for allergic rhinitis and urticaria. Patients taking SGAHs report relatively little and mild adverse events even after long-term continuous treatments. An antihistamine should ideally possess high selectivity for the H(1)-receptor, high PrH1R occupancy and low to no BrH1R occupancy.
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Affiliation(s)
- K Yanai
- Department of Pharmacology, Tohoku University School of Medicine, Sendai, Japan.
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Meguro K, Itoh M, Yanai K, Takase K, Yamaguchi S, Ido T, Yamadori A. Psychiatric wandering behaviour in dementia patients correlated with increased striatal dopamine D2 receptor as shown by [11C]YM-09151-2 and positron emission tomography. Eur J Neurol 2011. [DOI: 10.1111/j.1468-1331.1997.tb00338.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Affiliation(s)
- E Sakurai
- Department of Pharmacology, Tohoku University School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Japan.
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Yanai K, Okamura N, Tagawa M, Itoh M, Watanabe T. New findings in pharmacological effects induced by antihistamines: from PET studies to knock-out mice. Clin Exp Allergy 2009. [DOI: 10.1046/j.1365-2222.1999.00008.x-i1] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Sakurai E, Sakurai E, Watanabe T, Yanai K. Uptake of L-histidine and histamine biosynthesis at the blood-brain barrier. Inflamm Res 2009; 58 Suppl 1:34-5. [DOI: 10.1007/s00011-009-0656-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Takeuchi F, Yanai K, Inomata H, Kuzuya N, Kajio H, Honjo S, Takeda N, Kaburagi Y, Yasuda K, Shirasawa S, Sasazuki T, Kato N. Search of type 2 diabetes susceptibility gene on chromosome 20q. Biochem Biophys Res Commun 2007; 357:1100-6. [PMID: 17466274 DOI: 10.1016/j.bbrc.2007.04.063] [Citation(s) in RCA: 13] [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] [Received: 03/31/2007] [Accepted: 04/12/2007] [Indexed: 11/17/2022]
Abstract
Significant evidence of linkage to type 2 diabetes (T2D) has been shown in a relatively broad region on chromosome 20q, where the hepatocyte nuclear factor-4alpha (HNF4A) has been noted as a positional candidate. To systematically evaluate genetic susceptibility to T2D in the relevant region, we examined the disease association by using 1145 SNPs in two-step screening in the Japanese population. The marker screening enabled us to identify significant disease association in the lipopolysaccharide binding protein (LBP) but not in the HNF4A locus. In a 17.7-Mb interval screened, the strongest association was identified for a SNP, rs2232592, located in the intron of LBP, with an estimated odds ratio of 1.73 (95% CI 1.30-2.31) (P=0.0002) in the whole study panel involving 675 case and 474 control subjects. Our data suggest that the LBP gene may confer genetic susceptibility to T2D and this warrants further replication study.
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Affiliation(s)
- F Takeuchi
- Department of Medical Ecology and Informatics, Research Institute, International Medical Center of Japan, Tokyo, Japan
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Sakurai E, Sakurai E, Oreland L, Nishiyama S, Kato M, Watanabe T, Yanai K. Evidence for the presence of histamine uptake into the synaptosomes of rat brain. Pharmacology 2006; 78:72-80. [PMID: 16960463 DOI: 10.1159/000095637] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2005] [Accepted: 07/14/2006] [Indexed: 11/19/2022]
Abstract
Histamine has many physiological roles in the brain and periphery. Neuronal histamine is metabolized almost exclusively by histamine N-methyltransferase. Although several neurotransmitter systems such as dopamine and 5-hydroxytryptamine have their specific reuptake system in their neurons and glial cells, a specific histamine reuptake system into the corresponding nerve terminals or glial cells has not yet been clearly elucidated. We characterized the uptake of histamine into the P2 fractions of rat brain homogenized in 0.32 mol/l sucrose using in vitro uptake techniques. [3H]histamine uptake increased with the increment of added protein amount and elapsed time. [3H]histamine uptake was also temperature-dependent. The uptake of [3H]histamine into the P2 fractions occurs by two saturable processes, a high-affinity and a low-affinity, characterized by K(m) values of 0.16 and 1.2 micromol/l, respectively. Na(+), Cl(-) and HCO(3)(-) ions were essential for the uptake of histamine in P2 fractions. [3H]histamine uptake was inhibited in the presence of several tricyclic antidepressants. In accordance with this, the endogenous release of histamine from brain slices evoked by 100 mmol/l K(+) was augmented in the presence of 20 micromol/l imipramine. These results further support the existence of a specific histamine uptake system in the brain, although the precise molecular entities have not been identified until now.
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Affiliation(s)
- Eiko Sakurai
- Department of Pharmacology, Tohoku University School of Medicine, Sendai, Japan
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Ennis M, Masini E, Sturman G, Yanai K. Honorary membership of the European Histamine Research Society (EHRS). Inflamm Res 2006. [DOI: 10.1007/s00011-005-0057-6] [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: 10/24/2022] Open
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Abstract
Brain-gut interaction is considered to be a major factor in the pathophysiology of irritable bowel syndrome. However, only limited information has been provided on the influence of gastrointestinal tract stimulation on the brain. Our aim in this study was to determine the specific regions of the brain that are responsible for visceral perception and emotion provoked by distention of the descending colon in humans. Fifteen healthy males aged 22 +/- 1 participated in this study. Using a colonoscope, a balloon was inserted into the descending colon of each subject. After sham stimulation, the colon was randomly stimulated with bag pressures of 20 and 40 mmHg, and regional cerebral blood flow was measured by [(15)O] positron emission tomography. The subjects were asked to report visceral perception and emotion using an ordinate scale of 0-10. Colonic distention pressure dependently induced visceral perception and emotion, which significantly correlated with activation of specific regions of the brain including the prefrontal, anterior cingulate, parietal cortices, insula, pons, and the cerebellum. In conclusion, distention of the descending colon induces visceral perception and emotion. These changes significantly correlate with activation of specific regions in the brain including the limbic system and the association cortex, especially the prefrontal cortex.
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Affiliation(s)
- T Hamaguchi
- Department of Behavioral Medicine, Tohoku University Graduate School of Medicine, Aoba, Sendai, Japan
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Holgate ST, Canonica GW, Simons FER, Taglialatela M, Tharp M, Timmerman H, Yanai K. Consensus Group on New-Generation Antihistamines (CONGA): present status and recommendations. Clin Exp Allergy 2003; 33:1305-24. [PMID: 12956754 DOI: 10.1046/j.1365-2222.2003.01769.x] [Citation(s) in RCA: 112] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- S T Holgate
- Respiratory Cell and Molecular Biology, Infection, Inflammation, and Repair Division, School of Medicine, University of Southampton, UK.
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Lin L, Wisor J, Shiba T, Taheri S, Yanai K, Wurts S, Lin X, Vitaterna M, Takahashi J, Lovenberg TW, Koehl M, Uhl G, Nishino S, Mignot E. Measurement of hypocretin/orexin content in the mouse brain using an enzyme immunoassay: the effect of circadian time, age and genetic background. Peptides 2002; 23:2203-11. [PMID: 12535700 DOI: 10.1016/s0196-9781(02)00251-6] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The hypocretins (1 and 2) have emerged as key regulators of sleep and wakefulness. We developed a high-throughput enzyme immunoassay (EIA) to measure total brain hypocretin levels from large numbers of mice. Hypocretin levels were not altered by circadian time or age. However, significant differences in one or both hypocretin peptides were observed between different mouse strains. We studied hypocretin levels in knockout and transgenic mouse models with obesity, circadian gene mutations or monoaminergic defects. Compared to controls, only histamine receptor knockouts had lower hypocretin levels. This was most pronounced in H1 receptor knockouts suggesting the existence of a positive feedback loop between hypocretin and histaminergic neurons.
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Affiliation(s)
- L Lin
- Department of Psychiatry and Behavior Sciences, Center for Narcolepsy and Sleep Disorder, Stanford University, Palo Alto, CA 94304-5742, USA
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Iwata R, Pascali C, Bogni A, Yanai K, Kato M, Ido T, Ishiwata K. A combined loop-SPE method for the automated preparation of [11C]doxepin. J Labelled Comp Radiopharm 2002. [DOI: 10.1002/jlcr.557] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Watanabe T, Yanai K. Studies on functional roles of the histaminergic neuron system by using pharmacological agents, knockout mice and positron emission tomography. TOHOKU J EXP MED 2001; 195:197-217. [PMID: 11908822 DOI: 10.1620/tjem.195.197] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.5] [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: 11/18/2022]
Abstract
Since one of us, Takehiko Watanabe (TW), elucidated the location and distribution of the histaminergic neuron system in the brain with antibody raised against L-histidine decarboxylase (a histamine-forming enzyme, HDC) as a marker in 1984 and came to Tohoku University School of Medicine in Sendai, we have been collaborating on the functions of this neuron system by using pharmacological agents, knockout mice of the histamine-related genes, and, in some cases, positron emission tomography (PET). Many of our graduate students and colleagues have been actively involved in histamine research since 1985. Our extensive studies have clarified some of the functions of histamine neurons using methods from molecular techniques to non-invasive human PET imaging. Histamine neurons are involved in many brain functions, such as spontaneous locomotion, arousal in wake-sleep cycle, appetite control, seizures, learning and memory, aggressive behavior and emotion. Particularly, the histaminergic neuron system is one of the most important neuron systems to maintain and stimulate wakefulness. Histamine also functions as a bioprotection system against various noxious and unfavorable stimuli (for examples, convulsion, nociception, drug sensitization, ischemic lesions, and stress). Although activators of histamine neurons have not been clinically available until now, we would like to point out that the activation of the histaminergic neuron system is important to maintain mental health. Here, we summarize the newly-discovered functions of histamine neurons mainly on the basis of results from our research groups.
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Affiliation(s)
- T Watanabe
- Department of Pharmacology, Tohoku University Graduate School of Medicine, Sendai, Japan
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Nishino S, Fujiki N, Ripley B, Sakurai E, Kato M, Watanabe T, Mignot E, Yanai K. Decreased brain histamine content in hypocretin/orexin receptor-2 mutated narcoleptic dogs. Neurosci Lett 2001; 313:125-8. [PMID: 11682143 DOI: 10.1016/s0304-3940(01)02270-4] [Citation(s) in RCA: 110] [Impact Index Per Article: 4.8] [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: 10/17/2022]
Abstract
A growing amount of evidence suggests that a deficiency in hypocretin/orexin neurotransmission is critically involved in animal and human forms of narcolepsy. Since hypocretin-containing neurons innervate and excite histaminergic tuberomammillary neurons, altered histaminergic neurotransmission may also be involved in narcolepsy. We found a significant decrease in histamine content in the cortex and thalamus, two structures important for histamine-mediated cortical arousal, in Hcrtr-2 mutated narcoleptic Dobermans. In contrast, dopamine and norepinephrine contents in these structures were elevated in narcoleptic animals, a finding consistent with our hypothesis of altered catecholaminergic transmission in these animals. Considering the fact that histamine promotes wakefulness, decreases in histaminergic neurotransmission may also account for the sleep abnormalities in hypocretin-deficient narcolepsy.
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Affiliation(s)
- S Nishino
- Stanford University Center for Narcolepsy, 701B, First Floor, Palo Alto, CA 94304, USA.
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Son LZ, Yanai K, Mobarakeh JI, Kuramasu A, Li ZY, Sakurai E, Hashimoto Y, Watanabe T, Watanabe T. Histamine H1 receptor-mediated inhibition of potassium-evoked release of 5-hydroxytryptamine from mouse forebrains. Behav Brain Res 2001; 124:113-20. [PMID: 11640963 DOI: 10.1016/s0166-4328(01)00220-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The release of endogenous serotonin and dopamine from slices of mouse forebrains induced by high extracellular K(+) was examined in histamine H1 receptor knockout mice. The release of 5-hydroxytryptamine (5-HT) evoked by 30 mM K(+) significantly decreased in the presence of 10-50 microM histamine in wild-type mice, but was not inhibited in the mutant mice. Histamine H1 receptor-mediated inhibition of serotonin release in wild-type mice was also observed in the presence of thioperamide, an H3 antagonist. From these data, we postulate that endogenous histamine indirectly inhibits the release of 5-HT through H1 receptors in addition to H3 receptors. The treatment of 2 microM tetrodotoxin could partly abolish the effects of histamine on K(+)-evoked 5-HT release. Bicuculline, a GABA(A) antagonist, could reverse the histamine-induced inhibition of 5-HT release in wild-type mice, suggesting that H1 receptors facilitate the release of GABA, which in turn inhibits 5-HT release through GABA(A) receptors. The difference in the effects of d- and l-chlorpheniramine on K(+)-evoked 5-HT release in wild-type mice further supports the evidence of the function of H1 receptor modulating 5-HT release.
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Affiliation(s)
- L Z Son
- Department of Pharmacology, Tohoku University School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
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Iwata R, Pascali C, Bogni A, Miyake Y, Yanai K, Ido T. A simple loop method for the automated preparation of (11C)raclopride from (11C)methyl triflate. Appl Radiat Isot 2001; 55:17-22. [PMID: 11339532 DOI: 10.1016/s0969-8043(00)00368-7] [Citation(s) in RCA: 53] [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: 11/23/2022]
Abstract
A simple automated preparation of [11C]raclopride by reaction of [11C]methyl triflate with demethylraclopride triflate is described. The conventional bubbling of [11C]methyl triflate into the precursor solution was compared with two alternative methods which used a commercially available C18 cartridge (on-column method) or an empty PTFE tube (loop method) as support for the precursor solution. The influence of several solvents was assessed for all three methods. The on-column method showed excellent trapping efficiencies of [11C]methyl triflate but gave the lowest radiochemical yields. The loop method proved to be a simplified alternative to the bubbling method, giving comparable radiochemical yields with less precursor and offering an easy way to transfer the reaction mixture into an HPLC column. By the simple-loop method [11C]raclopride could be prepared in over 40% radiochemical yields (decay-corrected and based on [11C]methyl triflate).
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Affiliation(s)
- R Iwata
- Graduate School of Engineering, Tohoku University, Sendai, Japan.
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Iwata R, Pascali C, Bogni A, Yanai K, Kato M, Ido T, Ishiwata K. Preparation of [11C]doxepin from [11C]methyl triflate by loop method: Effect of specific activity on [11C]methylation. J Labelled Comp Radiopharm 2001. [DOI: 10.1002/jlcr.25804401347] [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: 11/09/2022]
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Yanai K, Nakane A, Kawate A, Hirayama M. Molecular cloning and characterization of the fructooligosaccharide-producing beta-fructofuranosidase gene from Aspergillus niger ATCC 20611. Biosci Biotechnol Biochem 2001; 65:766-73. [PMID: 11388451 DOI: 10.1271/bbb.65.766] [Citation(s) in RCA: 40] [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: 11/08/2022]
Abstract
The fopA gene encoding a fructooligosaccharide-producing beta-fructofuranosidase was isolated from Aspergillus niger ATCC 20611. The primary structure deduced from the nucleotide sequence showed considerable similarity to those of two other beta-fructofuranosidases from A. niger, but the fopA gene product had several amino acid insertions and an extra C-terminal polypeptide consisting of 38 amino acids that could not be found in the two others. We could successfully express the fopA gene in S. cerevisiae and the fopA gene product obtained from the culture supernatant of the S. cerevisiae transformant had similar characteristics to the beta-fructofuranosidase purified from A. niger ATCC 20611. However, we could not detect any beta-fructofuranosidase activity in either the culture supernatant or cell lysate when the C-terminal truncated fopA gene product by 38 amino acids was used to transform S. cerevisiae. In western analysis of those samples, there was no protein product that is cross-reacted with anti-beta-fructofuranosidase antibody. These results suggested that the C-terminal region of the fopA gene product consisting of 38 amino acids was essential for the enzyme production.
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Affiliation(s)
- K Yanai
- Bio Science Laboratories, Meiji Seika Kaisha, Ltd., Sakado-shi, Saitama, Japan.
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38
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Higuchi M, Yanai K, Okamura N, Meguro K, Arai H, Itoh M, Iwata R, Ido T, Watanabe T, Sasaki H. Histamine H(1) receptors in patients with Alzheimer's disease assessed by positron emission tomography. Neuroscience 2001; 99:721-9. [PMID: 10974435 DOI: 10.1016/s0306-4522(00)00230-x] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Cerebral histamine H(1) receptor binding was measured in vivo in 11 normal subjects (six young and five old) and 10 patients with Alzheimer's disease by positron emission tomography and [11C]doxepin, a radioligand for H(1) receptors. The parametric images describing the tracer kinetics were generated by either compartmental or graphical analysis, and were examined statistically on region-of-interest and voxel-by-voxel bases. The binding potential of H(1) receptors showed a significant decrease particularly in the frontal and temporal areas of the Alzheimer's disease brain compared to the old, normal subjects. In addition, the receptor binding correlated closely to the severity of Alzheimer's disease assessed by the Mini-Mental State Examination score within several brain areas. The ratio of K1 values between the brain areas and the cerebellum was used as a relative measure of regional cerebral blood flow which decreased in the frontal and temporal areas of the Alzheimer's disease brain. However, the difference in the binding potential (total concentration of receptor/equilibrium dissociation constant) between the Alzheimer's disease patients and the old, normal subjects was greater than that in the cerebral blood flow, and the rate of decrease in the binding potential with the progression of Alzheimer's disease was greater than the rate of decrease in the cerebral blood flow. This study reveals the predominant disruption of the histaminergic neurotransmission in the neurodegenerative processes of Alzheimer's disease. This study suggests that the decline of the histamine receptor binding might play a substantial role in the cognitive deficits of Alzheimer's disease patients.
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Affiliation(s)
- M Higuchi
- Department of Geriatric Medicine, Tohoku University School of Medicine, 980-8574, Sendai, Japan
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39
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Endou M, Yanai K, Sakurai E, Fukudo S, Hongo M, Watanabe T. Food-deprived activity stress decreased the activity of the histaminergic neuron system in rats. Brain Res 2001; 891:32-41. [PMID: 11164807 DOI: 10.1016/s0006-8993(00)03226-1] [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: 11/26/2022]
Abstract
The hypothalamus, which is rich in histaminergic neurons, is highly sensitive to aversive stimuli such as stress. Histamine H3 receptors, which regulate histamine release from the presynaptic site, are associated with stress-induced brain activity. In this study, we investigated the changes of histamine content and histamine H1 and H3 receptors in the brains of rats subjected to stress induced through food deprivation and physical activity on a running wheel (food-deprived activity stress). For purposes of comparison, we also examined the stressful effects of forced swimming on the histaminergic neuron system of rats. The H3 receptor density rapidly declined in the acute phase of stress but gradually returned to the control level in the chronic phase. On the other hand, the H1 receptor slowly decreased and remained at a low level during the chronic phase. These results reveal that there is a discrepancy between the levels of H1 and H3 receptors in the acute and chronic phases of stress. Brain histamine content gradually increased during the late phase of both food-deprived activity stress and forced swimming stress. These changes presumably resulted in the inhibition of histaminergic neuronal activity in the chronic stress condition. In accordance with this hypothesis, the intraventricular administration of histamine significantly reduced the hyperactivity caused by food-deprived activity stress. Since extensive exercise and restricted feeding are thought to be associated with anorexia nervosa, the abnormalities in the histaminergic neuron system might contribute to trait status in anorexia nervosa.
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Affiliation(s)
- M Endou
- Department of Pharmacology, Tohoku University School of Medicine, Seiryou-machi 2-1, Aoba-ku, 980-8575, Sendai, Japan
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40
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Dantzig A, LaLonde RT, Ramdayal F, Shepard RL, Yanai K, Zhang M. Cytotoxic responses to aromatic ring and configurational variations in alpha-conidendrin, podophyllotoxin, and sikkimotoxin derivatives. J Med Chem 2001; 44:180-5. [PMID: 11170627 DOI: 10.1021/jm990563p] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [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
Derivatives of alpha-conidendrin, podophyllotoxin, and sikkimotoxin were prepared to evaluate the cytotoxic contributions of C-4 configuration and pendant and fused arene substitutions. Dimethyl-alpha-conidendryl alcohol (5), 9-deoxypodophyllol (6), and 9-deoxysikkimol (17) were dehydrated to their respective oxolane derivatives 4, 3, and 9. Diols 5 and 6 were converted via oxabicyclo[3.2.1]octanols 10 and 14 to target oxolanes 8 and 7 where C-4 had been inverted relative to that in 3 and 4. Cytotoxicities of the five oxolanes were determined in two drug-sensitive human leukemia and two multidrug-resistant cell lines expressing P-glycoprotein or multidrug-resistance associated protein (MRP). Changing the pendant arene configuration or replacing a m-methoxy by hydrogen resulted in a 100-fold cytotoxicity loss. Replacing a methylenedioxy group in the fused arene by two methoxy substituents reduced cytotoxicity by 10-fold. Drug-resistant cell lines were equally resistant to compounds 3, 4, 8, and 9 indicating that these four compounds do not serve as substrates of the transport proteins P-glycoprotein and MRP.
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Affiliation(s)
- A Dantzig
- Department of Chemistry, State University of New York, College of Environmental Science and Forestry, Syracuse, New York 13210-2726, USA
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41
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Yanai K, Tagawa M. [The role of positron emission tomography in neuropharmacology in the living human brain and drug development]. Nihon Rinsho 2000; 58:2149-57. [PMID: 11068462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
Neuroimaging is a powerful and innovative tool for studying the pathology of psychiatric and neurological diseases and, more recently, for studying the drugs used in their treatment. Technological advances in imaging have made it possible to noninvasively extract information from the human brain regarding a drug's mechanism and site of action. Until now, our understanding of human brain pharmacology has depended primarily on indirect assessments or models derived from animal studies. However, the advent of multiple techniques for human brain imaging allows researchers to focus directly on human pharmacology and brain function. In this review article, our PET studies on histaminergic neuron system were presented as an example. We have developed and used the PET techniques for 10 years in order to examine the functions of histaminergic neurons in the living human brain. This review outlines available PET techniques and examines how these various methods have already been applied to the drug development process and neuropharmacology in the living human brain.
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Affiliation(s)
- K Yanai
- Department of Pharmacology, Tohoku University School of Medicine
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Tagawa M, Kano M, Okamura N, Itoh M, Sakurai E, Watanabe T, Yanai K. Relationship between effects of alcohol on psychomotor performances and blood alcohol concentrations. Jpn J Pharmacol 2000; 83:253-60. [PMID: 10952075 DOI: 10.1254/jjp.83.253] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 09/29/2022]
Abstract
Ethanol is a social drug and has been generally known to be a CNS depressant. A large fluctuation of blood alcohol concentration (BAC) is well-known to occur due to main factors such as the genetic polymorphism of the main alcohol metabolizing enzymes and the effect of blood. Few studies have substantially discussed the relationship between impaired CNS activities and BAC. In this study, focusing on the correlation of BAC, we investigated the acute effects of alcohol intake on cognitive performance in humans by objective evaluation methods consisting of the attention-demanding cognitive tasks. Tasks were administered to ten healthy male volunteers before and after ingesting established amounts of alcohol. With increased BAC, we observed prolongation of reaction time performances and lowering of a coordination performance. From the results, we concluded that cognitive performance deteriorates with an increase of BAC. Additionally, the BAC threshold that causes significant impairment of cognitive performance was estimated to be approximately 50 mg/dl (ca. 10 mM).
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Affiliation(s)
- M Tagawa
- Department of Pharmacology, Tohoku University School of Medicine, Sendai, Japan
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Yamakami J, Sakurai E, Kuramasu A, Sakurai E, Yanai K, Watanabe T, Tanaka Y. L-Histidine decarboxylase protein and activity in rat brain microvascular endothelial cells. Inflamm Res 2000; 49:231-5. [PMID: 10893046 DOI: 10.1007/s000110050584] [Citation(s) in RCA: 18] [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: 10/28/2022] Open
Abstract
OBJECTIVE AND DESIGN L-Histidine decarboxylase (HDC) is the primary enzyme regulating histamine biosynthesis. This study was carried out to examine whether the cultured rat brain microvascular endothelial cells (BMEC), which constitute the blood-brain barrier (BBB), have the ability to form histamine, and whether HDC mRNA is expressed in rat BMEC. MATERIAL Male, 3-week-old Wistar rats were used. For in vitro studies, rat BMEC were isolated from rat brains, and subculture cells were grown on collagen-coated culture flask and slide. METHODS HDC assay, immunofluorescence analysis and expression of HDC mRNA by RT-PCR were performed in rat BMEC. RESULTS The HDC activity of the BMEC was estimated to be 0.14 +/- 0.05 p mol/min/mg protein. This activity was completely inhibited by (S)-alpha-fluoromethylhistidine, a specific inhibitor of HDC. Using a polyclonal anti HDC antibody and immunofluorescence microscopy, we confirmed the presence of HDC protein in rat BMEC. RT-PCR also showed the expression of HDC mRNA in rat BMEC. CONCLUSIONS L-Histidine uptaken by rat BMEC was shown to be converted to histamine, suggesting that HDC plays an important role in BBB.
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Affiliation(s)
- J Yamakami
- Department of Pharmaceutics I, Tohoku Pharmaceutical University, Sendai, Japan
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Abstract
Breathing patterns are influenced by body temperature. However, the central mechanism for changes of breathing patterns is unknown. We previously showed that central histamine contributed to temperature-induced polypnea in mice (Izumizaki, M., Iwase, M., Homma, I., Yanai, K., Watanabe, T. and Watanabe, T., Central histamine contributed to the temperature-induced polypnea in mice, Neurosci. Res., 23 (1999) S282). In this study we examined the role of central histamine H1 receptors in temperature-induced polypnea using wild and mutant mice lacking histamine H1 receptors. Breathing patterns were characterized at two different body temperatures during hypercapnia under conscious conditions. In wild mice a raised body temperature increased respiratory frequency mainly due to a reduction in expiratory time, whereas in mutant mice respiratory frequency did not increase even though the body temperature was elevated. These results indicate that central histamine contributes to an increase in respiratory frequency due to a reduction in expiratory time through histamine H1 receptors when body temperature is raised.
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Affiliation(s)
- M Izumizaki
- Department of Physiology, School of Medicine, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, Japan
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Tofukuji M, Nakame T, Murata S, Yanai K, Ohmi M, Tabayashi K. Altered distribution and density of myocardial beta-adrenoceptors during acute rejection in rats. Transplantation 2000; 69:1572-7. [PMID: 10836364 DOI: 10.1097/00007890-200004270-00009] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND A better understanding of altered expression of myocardial beta-adrenoceptors can facilitate the diagnosis of early and late acute rejection of heart transplants. METHODS We submitted rats to heterotopic heart transplantation (iso- and allografts) of which one of each were treated with or without cyclosporin A for 4, 7, and 14 days (n=5, respectively). The cardiac sections were incubated in vitro with [3H]CGP 12177, or the hearts were labeled in vivo by intravenous injection of [3H]CGP 12177. Autoradiographic images of both were analyzed digitally and compared with histologic findings. RESULTS Beta-adrenoceptor distribution in native hearts and isografts was homogeneous, but highly differential distribution and density in allografts were observed in the left and right ventricular walls and in the interventricular septum despite treatment with cyclosporin A. High-density areas in the progressive course of acute rejection are commonly associated with up-regulation of beta-adrenoceptors in apparently viable myocytes, although histologic findings confirmed many infiltrating mononuclear cells. Low-density areas, which were identified in the right and left ventricular walls as early as 4 days after transplantation, correlated with derangement of myocytes, which was suggestive of early acute rejection. The images obtained by in vivo technique were comparable to in vitro images. CONCLUSIONS The alteration of beta-adrenoceptor expression in allografts showed a close relationship with the severity of acute rejection, and the techniques employed in this model were useful in our study of the rejection process and in detecting early and late acute rejection in the rat.
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Affiliation(s)
- M Tofukuji
- Department of Thoracic and Cardiovascular Surgery, Tohoku University School of Medicine, Sendai, Japan
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46
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Takei F, Yanai K, Onitsuka K, Takahashi S. Screw-sense-selective polymerization of aryl isocyanides initiated by a Pd-Pt mu-ethynediyl dinuclear complex: a novel method for the synthesis of single-handed helical poly(isocyanide)s with the block copolymerization technique. Chemistry 2000; 6:983-93. [PMID: 10785818 DOI: 10.1002/(sici)1521-3765(20000317)6:6<983::aid-chem983>3.0.co;2-p] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Living polymerization of chiral aryl isocyanides, such as m- and p-menthoxycarbonylphenyl isocyanides 2 and 5, initiated by the Pd-Pt mu-ethynediyl dinuclear complex 1, proceeds with a high screw-sense selectivity to give the poly(isocyanide)s 3 and 6, which exhibit a large specific rotation and an intense CD band at lambda = 364 nm as a consequence of a helical chirality. The molar optical rotation and molar circular dichroism of the resulting polymers 3 and 6 reach a constant value at a degree of polymerization (Pn) of more than 30. Screw-sense-selective polymerization of achiral aryl isocyanides that bear very bulky substituents, such as 3,5-di(propoxycarbonyl)phenyl isocyanide (11), 3,5-di(butoxycarbonyl)phenyl isocyanide (13), and 3,5-di(cyclohexyloxycarbonyl)phenyl isocyanide (15), is achieved by the use of chiral oligomer complexes 3(30) and 6(30), prepared from the reaction of 1 with 30 equivalents of 2 or 5, as an initiator to give predominantly single-handed helical polymers. In contrast, smaller aryl isocyanides are also polymerized by 3(30) and 6(30) with screw-sense selectivity in the initial stage of the reaction, but the single-handed helix is not preserved up to high molecular weight. Kinetic studies of the polymerization of (L)- and (D)-2, or (L)- and (D)-5 with chiral oligomer complexes (L)-3(50) or (L)-6(100) suggests that the screw sense of the polymer backbone is not controlled kinetically, but rather that the thermodynamically stable screw sense is produced.
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Affiliation(s)
- F Takei
- Institute of Scientific and Industrial Research, Osaka University, Japan
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47
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Mobarakeh JI, Sakurada S, Katsuyama S, Kutsuwa M, Kuramasu A, Lin ZY, Watanabe T, Hashimoto Y, Watanabe T, Yanai K. Role of histamine H(1) receptor in pain perception: a study of the receptor gene knockout mice. Eur J Pharmacol 2000; 391:81-9. [PMID: 10720638 DOI: 10.1016/s0014-2999(00)00060-1] [Citation(s) in RCA: 102] [Impact Index Per Article: 4.3] [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: 11/29/2022]
Abstract
To study the participation of histamine H(1) receptors in pain perception, histamine H(1) receptor knockout mice were examined for pain threshold by means of three different kinds of nociceptive tasks. These included assays for thermal nociception (hot-plate, tail-flick, paw-withdrawal), mechanical nociception (tail-pressure), and chemical nociception (abdominal constriction, formalin test, capsaicin test) which evoked pain by the activation in nociceptive Adelta and C fibers. The mutant mice lacking histamine H(1) receptors showed significantly fewer nociceptive responses to the hot-plate, tail-flick, tail-pressure, paw-withdrawal, formalin, capsaicin, and abdominal constriction tests. Sensitivity to noxious stimuli in histamine H(1) receptor knockout mice significantly decreased when compared to wild-type mice. This data indicates that histamine plays an important role in both somatic and visceral pain perceptions through histamine H(1) receptors. The difference in the effect of histamine H(1) receptors antagonist, the active (D-) and inactive (L-) isomers of chlorpheniramine on ICR mice further substantiates the evidence of the role of histamine H(1) receptors on pain threshold.
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Affiliation(s)
- J I Mobarakeh
- Department of Pharmacology, Tohoku University School of Medicine, Seiryo-machi 2-1, Aoba-Ku, Sendai, Japan
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Mochizuki R, Ishizuka Y, Yanai K, Murakami K, Koga Y, Fukamizu A. Corrigendum to 'Molecular cloning and expression of human neurochondrin-1 and -2'(1). Biochim Biophys Acta 2000; 1490:367-8. [PMID: 10684983 DOI: 10.1016/s0167-4781(99)00236-5] [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] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- R Mochizuki
- Sumitomo Pharmaceuticals Research Center, Sumitomo Pharmaceuticals, Osaka, Japan
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49
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Yanai K, Saito T, Kakinuma Y, Kon Y, Hirota K, Taniguchi-Yanai K, Nishijo N, Shigematsu Y, Horiguchi H, Kasuya Y, Sugiyama F, Yagami KI, Murakami K, Fukamizu A. Renin-dependent cardiovascular functions and renin-independent blood-brain barrier functions revealed by renin-deficient mice. J Biol Chem 2000; 275:5-8. [PMID: 10617578 DOI: 10.1074/jbc.275.1.5] [Citation(s) in RCA: 129] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Renin plays a key role in controlling blood pressure through its specific cleavage of angiotensinogen to generate angiotensin I (AI). Although possible existence of the other angiotensin forming enzymes has been discussed to date, its in vivo function remains to be elucidated. To address the contribution of renin, we generated renin knockout mice. Homozygous mutant mice show neither detectable levels of plasma renin activity nor plasma AI, lowered blood pressure 20-30 mm Hg less than normal, increased urine and drinking volume, and altered renal morphology as those observed in angiotensinogen-deficient mice. We recently found the decreased density in granular layer cells of hippocampus and the impaired blood-brain barrier function in angiotensinogen-deficient mice. Surprisingly, however, such brain phenotypes were not observed in renin-deficient mice. Our results demonstrate an indispensable role for renin in the circulating angiotensin generation and in the maintenance of blood pressure, but suggest a dispensable role for renin in the blood-brain barrier function.
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Affiliation(s)
- K Yanai
- Center for Tsukuba Advanced Research Alliance, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
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50
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Iwata R, Pascali C, Bogni A, Horvath G, Kovacs Z, Yanai K, Ido T. A new, convenient method for the preparation of 4-[18F]fluorobenzyl halides. Appl Radiat Isot 2000; 52:87-92. [PMID: 10670927 DOI: 10.1016/s0969-8043(99)00117-7] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A convenient method suitable for automated preparation of 4-[18F]fluorobenzyl halides from no-carrier-added [18F]fluoride has been developed. 4-[18F]Fluorobenzaldehyde, synthesized from [18F]fluoride by aromatic nucleophilic substitution on 4-trimethylammoniumbenzaldehyde triflate, was first retained on a C18 cartridge and there efficiently reduced to 4-[18F]fluorobenzyl alcohol simply by flowing an aqueous solution of NaBH4. The conversion of 4-[18F]fluorobenzyl alcohol to 4-[18F]fluorobenzyl halide was investigated using PBr3, PI3, P2I4, Ph3PBr2 and Ph3PI2 in CH2Cl2. 4-[18F]Fluorobenzyl halides were purified by passing through a disposable silica cartridge. The conversion rapidly proceeded in radiochemical yields of nearly 90% at 40 degrees C with P2I4 and almost quantitatively at room temperature with Ph3PBr2. With this last reagent 4-[18F]fluorobenzyl bromide was obtained in overall radiochemical yields of 50-60% within 30 min from EOB.
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Affiliation(s)
- R Iwata
- CYRIC Tohoku University, Sendai, Japan.
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