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Kashiwagi N, Nakaya Y, Yoshino Y, Tatsumi M, Tomiyama N. Calyceal Diverticulum Found Incidentally on 18 F-FDG PET/CT Imaging. Clin Nucl Med 2024; 49:265-267. [PMID: 38271221 DOI: 10.1097/rlu.0000000000005056] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2024]
Abstract
ABSTRACT A 69-year-old man with pancreatic cancer underwent 18 F-FDG PET/CT examination for tumor staging. The PET images showed a focal mass-like FDG accumulation in the left kidney mimicking malignancy, whereas simultaneous CT and fused PET/CT images suggested a cystic lesion. On subsequent MR examination, the lesion appeared cystic on T2-weighted, contrast-enhanced arterial phase, and contrast-enhanced venous phase images. In addition, excretory phase images showed filling contrast medium to the cystic cavity, leading to a diagnosis of calyceal diverticulum. This report suggests that the possibility of a calyceal diverticulum should be considered in cases with focal FDG accumulation in renal cystic lesions.
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Affiliation(s)
- Nobuo Kashiwagi
- From the Departments of Diagnostic and Interventional Radiology
| | - Yasuhiro Nakaya
- From the Departments of Diagnostic and Interventional Radiology
| | | | - Mitsuaki Tatsumi
- Department of Radiology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Noriyuki Tomiyama
- Department of Radiology, Osaka University Graduate School of Medicine, Osaka, Japan
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Ikezawa K, Fukuda J, Nakao M, Nakano Y, Higashi C, Chagi M, Nakaya Y, Ohkawa K. Correlation between main pancreatic duct diameter measurements: Special pancreatic ultrasonography versus magnetic resonance cholangiopancreatography. Medicine (Baltimore) 2024; 103:e37283. [PMID: 38394509 DOI: 10.1097/md.0000000000037283] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/25/2024] Open
Abstract
Main pancreatic duct (MPD) dilatation is reported to be a risk factor for pancreatic cancer (PC). Although magnetic resonance cholangiopancreatography (MRCP) and ultrasonographic modalities are valuable for monitoring the pancreas, there is limited information on the efficacy of different imaging modalities in measuring MPD diameter. To improve pancreatic imaging, we developed a specialized ultrasound approach focusing on the pancreas (special pancreatic US). We aimed to examine the correlation between MPD diameter measurements using special pancreatic US versus MRCP. We retrospectively reviewed the clinical data of patients with MPD dilation (≥2.5 mm) via special pancreatic US used for screening at our institution between January 2020 and October 2022 and included patients who underwent magnetic resonance imaging 2 months before and after pancreatic US. The MPD diameter on MRCP was measured at the pancreatic locus, where the maximum MPD diameter was obtained on special pancreatic US. This study included 96 patients, with a median interval of 8.5 days between the date of special pancreatic US and the date of undergoing MRCP. MPD dilatation and/or pancreatic cysts were diagnosed in 86 patients, PC in 5 patients, and other diseases in 5 patients. The median MPD diameter, measured using special pancreatic US, was 3.4 mm (interquartile range: 2.9-4.9 mm), whereas it was 3.5 mm using MRCP (interquartile range: 2.8-4.5 mm). There were strong positive correlations between MPD diameter measured on special pancreatic US and that measured on MRCP (R = 0.925, P < .001). This study revealed strong positive correlations between the MPD diameter measurements using special pancreatic US and MRCP. MPD diameter measurements from each imaging method can be helpful during follow-up in individuals at a high risk of PC.
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Affiliation(s)
- Kenji Ikezawa
- Department of Hepatobiliary and Pancreatic Oncology, Osaka International Cancer Institute, Osaka, Japan
| | - Junko Fukuda
- Department of Clinical Laboratory, Osaka International Cancer Institute, Osaka, Japan
| | - Miho Nakao
- Department of Clinical Laboratory, Osaka International Cancer Institute, Osaka, Japan
| | - Yoko Nakano
- Department of Hepatobiliary and Pancreatic Oncology, Osaka International Cancer Institute, Osaka, Japan
| | - Chiaki Higashi
- Department of Hepatobiliary and Pancreatic Oncology, Osaka International Cancer Institute, Osaka, Japan
| | - Mayumi Chagi
- Department of Hepatobiliary and Pancreatic Oncology, Osaka International Cancer Institute, Osaka, Japan
| | - Yasuhiro Nakaya
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, Osaka, Japan
| | - Kazuyoshi Ohkawa
- Department of Hepatobiliary and Pancreatic Oncology, Osaka International Cancer Institute, Osaka, Japan
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Sakai M, Kashiwagi N, Nakanishi K, Maeda N, Nakaya Y, Tanaka J, Watanabe S, Hongyo H, Tanaka Y, Yamada S, Kawata A, Toda S, Takano K, Arita H, Tomiyama N. Nonbrain metastases seen on magnetic resonance imaging during metastatic brain tumor screening. Jpn J Radiol 2022; 41:367-381. [PMID: 36374473 PMCID: PMC10066091 DOI: 10.1007/s11604-022-01362-2] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Accepted: 11/04/2022] [Indexed: 11/16/2022]
Abstract
AbstractAlthough metastases found during head magnetic resonance imaging (MRI) are not limited to metastatic brain tumors, the MRI is a very common method for “brain metastasis screening,” a modality that is being increasingly performed. In this review, we describe MRI findings of nonbrain metastases and discuss ways to avoid missing these lesions. Metastatic cranial bone tumors are among the most common nonbrain metastatic lesions found on head MRI, followed by leptomeningeal carcinomatosis. The other less-frequent metastatic lesions include those in the ventricle/choroid plexus, the pituitary gland and stalk, and the pineal gland. Metastases in the head and neck area, as well as cranial and intracranial lesions, should be carefully evaluated. Furthermore, direct geographical invasion, perineural spread, and double cancers should also be considered. While it is important to recognize these metastatic lesions on MRI, because they may necessitate a change in treatment strategy that could lead to an improvement in prognosis due to early introduction of therapy, nonbrain lesions should also be given greater attention, given the increasing survival of patients with cancer and advances in MRI technology, such as contrast-enhanced-3D T1-weighted imaging.
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Affiliation(s)
- Mio Sakai
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-Ku, Osaka-Shi, Osaka, 541-8567, Japan.
| | - Nobuo Kashiwagi
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-Ku, Osaka-Shi, Osaka, 541-8567, Japan
| | - Katsuyuki Nakanishi
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-Ku, Osaka-Shi, Osaka, 541-8567, Japan
| | - Noboru Maeda
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-Ku, Osaka-Shi, Osaka, 541-8567, Japan
| | - Yasuhiro Nakaya
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-Ku, Osaka-Shi, Osaka, 541-8567, Japan
| | - Junichiro Tanaka
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-Ku, Osaka-Shi, Osaka, 541-8567, Japan
| | - Shinichiro Watanabe
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-Ku, Osaka-Shi, Osaka, 541-8567, Japan
| | - Hidenari Hongyo
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-Ku, Osaka-Shi, Osaka, 541-8567, Japan
| | - Yu Tanaka
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-Ku, Osaka-Shi, Osaka, 541-8567, Japan
| | - Sawaka Yamada
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-Ku, Osaka-Shi, Osaka, 541-8567, Japan
| | - Atsushi Kawata
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-Ku, Osaka-Shi, Osaka, 541-8567, Japan
| | - Sou Toda
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-Ku, Osaka-Shi, Osaka, 541-8567, Japan
| | - Koji Takano
- Department of Neurosurgery, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-Ku, Osaka-Shi, Osaka, 541-8567, Japan
| | - Hideyuki Arita
- Department of Neurosurgery, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-Ku, Osaka-Shi, Osaka, 541-8567, Japan
| | - Noriyuki Tomiyama
- Department of Radiology, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita, Osaka, 565-0871, Japan
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Nakanishi K, Tanaka J, Nakaya Y, Maeda N, Sakamoto A, Nakayama A, Satomura H, Sakai M, Konishi K, Yamamoto Y, Nagahara A, Nishimura K, Takenaka S, Tomiyama N. Whole-body MRI: detecting bone metastases from prostate cancer. Jpn J Radiol 2022; 40:229-244. [PMID: 34693502 PMCID: PMC8891104 DOI: 10.1007/s11604-021-01205-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 09/29/2021] [Indexed: 12/13/2022]
Abstract
Whole-body magnetic resonance imaging (WB-MRI) is currently used worldwide for detecting bone metastases from prostate cancer. The 5-year survival rate for prostate cancer is > 95%. However, an increase in survival time may increase the incidence of bone metastasis. Therefore, detecting bone metastases is of great clinical interest. Bone metastases are commonly located in the spine, pelvis, shoulder, and distal femur. Bone metastases from prostate cancer are well-known representatives of osteoblastic metastases. However, other types of bone metastases, such as mixed or inter-trabecular type, have also been detected using MRI. MRI does not involve radiation exposure and has good sensitivity and specificity for detecting bone metastases. WB-MRI has undergone gradual developments since the last century, and in 2004, Takahara et al., developed diffusion-weighted Imaging (DWI) with background body signal suppression (DWIBS). Since then, WB-MRI, including DWI, has continued to play an important role in detecting bone metastases and monitoring therapeutic effects. An imaging protocol that allows complete examination within approximately 30 min has been established. This review focuses on WB-MRI standardization and the automatic calculation of tumor total diffusion volume (tDV) and mean apparent diffusion coefficient (ADC) value. In the future, artificial intelligence (AI) will enable shorter imaging times and easier automatic segmentation.
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Affiliation(s)
- Katsuyuki Nakanishi
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69 Otemae, Chuo-ku, Osaka, 541-8567 Japan
| | - Junichiro Tanaka
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69 Otemae, Chuo-ku, Osaka, 541-8567 Japan
| | - Yasuhiro Nakaya
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69 Otemae, Chuo-ku, Osaka, 541-8567 Japan
| | - Noboru Maeda
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69 Otemae, Chuo-ku, Osaka, 541-8567 Japan
| | - Atsuhiko Sakamoto
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69 Otemae, Chuo-ku, Osaka, 541-8567 Japan
| | - Akiko Nakayama
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69 Otemae, Chuo-ku, Osaka, 541-8567 Japan
| | - Hiroki Satomura
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69 Otemae, Chuo-ku, Osaka, 541-8567 Japan
| | - Mio Sakai
- Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3-1-69 Otemae, Chuo-ku, Osaka, 541-8567 Japan
| | - Koji Konishi
- Department of Radiation Oncology, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-ku, Osaka, 541-8567 Japan
| | - Yoshiyuki Yamamoto
- Department of Urology, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-ku, Osaka, 541-8567 Japan
| | - Akira Nagahara
- Department of Urology, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-ku, Osaka, 541-8567 Japan
| | - Kazuo Nishimura
- Department of Urology, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-ku, Osaka, 541-8567 Japan
| | - Satoshi Takenaka
- Department of Orthopaedic Surgery, Osaka International Cancer Institute, 3-1-69, Otemae, Chuo-ku, Osaka, 541-8567 Japan
| | - Noriyuki Tomiyama
- Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita, Osaka, Suita, 565-0871 Japan
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Nakaya Y, Takahashi A, Inoue N, Taniguchi T, Ishikawa Y, Hijikata-Okunomiya A. Inhibitory Effect of Argatroban on Thrombin-induced MAP Kinase Activation. Thromb Haemost 2017. [DOI: 10.1055/s-0037-1615247] [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: 10/17/2022]
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Shinozaki T, Imamura Y, Kohashi R, Dezawa K, Nakaya Y, Sato Y, Watanabe K, Morimoto Y, Shizukuishi T, Abe O, Haji T, Tabei K, Taira M. Spatial and Temporal Brain Responses to Noxious Heat Thermal Stimuli in Burning Mouth Syndrome. J Dent Res 2016; 95:1138-46. [DOI: 10.1177/0022034516653580] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Burning mouth syndrome (BMS) is an idiopathic orofacial pain condition. Although the pathophysiology of BMS is not clearly understood, central and peripheral neuropathic mechanisms are thought to be involved. The authors compared brain response to noxious heat stimuli in 16 right-handed women with primary BMS and 15 sex- and age-matched right-handed healthy female controls. A thermal stimulus sequence of 32 °C to 40 °C to 32 °C to 49 °C was repeated 4 times in a cycle. Warm and noxious heat stimuli were delivered with a Peltier thermode placed on the right palm or right lower lip for 32 s each in a session. Functional magnetic resonance imaging data were obtained by recording echoplanar images with a block design. Statistical Parametric Mapping 8 software was used to analyze the data. Patients and controls both reported feeling more pain during palm stimulation than during lip stimulation. Repetition of noxious heat stimulus on the lower lip but not on the palm induced habituation in brain activity in the cingulate cortex without reduction in pain perception. Multiple regression analysis revealed a correlation between perceived pain intensity and suppression of brain activity in the anterior cingulate cortex when the repeated thermal sequence was applied at the lower lip. Furthermore, the response of the parahippocampal area differed in BMS patients and controls when the same repeated thermal sequence was applied at the palm. The authors’ findings indicate that BMS patients show specific brain responses due to impaired function of the central and peripheral nervous systems (clinical trial registration: UMIN000015002).
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Affiliation(s)
- T. Shinozaki
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
- Clinical Research Division, Nihon University Dental Research Center, Tokyo, Japan
| | - Y. Imamura
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
- Clinical Research Division, Nihon University Dental Research Center, Tokyo, Japan
| | - R. Kohashi
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - K. Dezawa
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - Y. Nakaya
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - Y. Sato
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - K. Watanabe
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - Y. Morimoto
- Division of Oral and Maxillofacial Radiology, Kyushu Dental University, Kitakyushu, Japan
| | - T. Shizukuishi
- Department of Radiology, Nihon University School of Medicine, Tokyo, Japan
| | - O. Abe
- Department of Radiology, Nihon University School of Medicine, Tokyo, Japan
| | - T. Haji
- Brain Activity Imaging Center, ATR-Promotions Inc., Osaka, Japan
| | - K. Tabei
- Department of Dementia Prevention and Therapeutics, Mie University Graduate School of Medicine, Tsu, Japan
| | - M. Taira
- Department of Cognitive Neurobiology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
- Center for Brain Integration Research, Tokyo Medical and Dental University, Tokyo, Japan
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Mitsuya K, Nakasu Y, Hayashi N, Harada H, Nishimura T, Ito I, Urikura A, Nakaya Y, Endo M. P16.22 * DIFFERENTIAL DIAGNOSIS OF TUMOR RECURRENCE AND RADIATION NECROSIS AFTER RADIOSURGERY FOR BRAIN METASTASES WITH 320-ROW AREA DETECTOR CT PERFUSION IMAGING. Neuro Oncol 2014. [DOI: 10.1093/neuonc/nou174.317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Nakaya Y, Shide K, Naito H, Niwa T, Horio T, Miyake J, Shimoda K. Effect of NS-018, a selective JAK2V617F inhibitor, in a murine model of myelofibrosis. Blood Cancer J 2014; 4:e174. [PMID: 24413068 PMCID: PMC3913942 DOI: 10.1038/bcj.2013.73] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Revised: 11/14/2013] [Accepted: 12/05/2013] [Indexed: 12/21/2022] Open
Abstract
A single somatic mutation, V617F, in Janus kinase 2 (JAK2) is one of the causes of myeloproliferative neoplasms (MPNs), including primary myelofibrosis, and the JAK2V617F mutant kinase is a therapeutic target in MPN. However, inhibition of wild-type (WT) JAK2 can decrease the erythrocyte or platelet (PLT) count. Our selective JAK2 inhibitor, NS-018, suppressed the growth of Ba/F3 cells harboring JAK2V617F more strongly than that of cells harboring WT JAK2. The 4.3-fold JAK2V617F selectivity of NS-018 is higher than the 1.0- to 2.9-fold selectivity of seven existing JAK2 inhibitors. NS-018 also inhibited erythroid colony formation in JAK2V617F transgenic mice at significantly lower concentrations than in WT mice. In keeping with the above results, in a JAK2V617F bone marrow transplantation mouse model with a myelofibrosis-like disease, NS-018 reduced leukocytosis and splenomegaly, improved bone marrow fibrosis and prolonged survival without decreasing the erythrocyte or PLT count in the peripheral blood. By exploring the X-ray co-crystal structure of NS-018 bound to JAK2, we identified unique hydrogen-bonding interactions between NS-018 and Gly993 as a plausible explanation for its JAK2V617F selectivity. These results suggest that NS-018 will have therapeutic benefit for MPN patients through both its efficacy and its reduced hematologic adverse effects.
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Affiliation(s)
- Y Nakaya
- 1] Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University, Osaka, Japan [2] Discovery Research Laboratories, Nippon Shinyaku Co. Ltd, Kyoto, Japan
| | - K Shide
- Department of Gastroenterology and Hematology, Faculty of Medicine, Miyazaki University, Miyazaki, Japan
| | - H Naito
- Discovery Research Laboratories, Nippon Shinyaku Co. Ltd, Kyoto, Japan
| | - T Niwa
- Discovery Research Laboratories, Nippon Shinyaku Co. Ltd, Kyoto, Japan
| | - T Horio
- Discovery Research Laboratories, Nippon Shinyaku Co. Ltd, Kyoto, Japan
| | - J Miyake
- Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University, Osaka, Japan
| | - K Shimoda
- Department of Gastroenterology and Hematology, Faculty of Medicine, Miyazaki University, Miyazaki, Japan
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Murata J, Baba H, Behr J, Iguri T, Ikeda M, Kawamura H, Kishi R, Levy C, Nakaya Y, Narikawa R, Ninomiya K, Onishi J, Openshaw R, Pearson M, Seitaibashi E, Saiba S, Tanaka S, Tanuma R, Totsuka Y, Toyoda T. T-Violation experiment at TRIUMF-ISAC using polarized 8Li. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146605017] [Citation(s) in RCA: 2] [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: 11/14/2022] Open
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Nishimoto S, Fukuda D, Shimabukuro M, Matsumoto S, Ishida M, Yagi S, Soeki T, Sakaue H, Nakaya Y, Sata M. Genetic ablation of TLR9 improves insulin resistance through macrophage accumulation in adipose tissue. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht309.p3267] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Jörns A, Arndt T, Meyer zu Vilsendorf A, Klempnauer J, Wedekind D, Hedrich HJ, Marselli L, Marchetti P, Harada N, Nakaya Y, Wang GS, Scott FW, Gysemans C, Mathieu C, Lenzen S. Vergleich des Immunzellinfiltrats und des Zytokinmusters in Pankreasinseln von Tiermodellen des Typ 1 Diabetes mit der humanen Situation. DIABETOL STOFFWECHS 2013. [DOI: 10.1055/s-0033-1341732] [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: 10/26/2022]
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Noma N, Shinoda M, Honda K, Kiyomoto M, Dezawa K, Nakaya Y, Komiyama O, Imamura Y, Iwata K. Interaction of IL-1β and P2X(3) receptor in pathologic masseter muscle pain. J Dent Res 2013; 92:456-60. [PMID: 23520364 DOI: 10.1177/0022034513483770] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
The exact mechanism underlying chronic masseter muscle pain, a conspicuous symptom in temporomandibular disorder, remains unclear. We investigated whether expression of P2X3 receptor (P2X3R) is involved in mechanical hyperalgesia after contraction of masseter muscle (CMM). As compared with sham rats, the head-withdrawal threshold (HWT) to mechanical pressure stimulation of masseter muscle (MM) (but not after similar stimulation of facial skin) was significantly lower, and IL-1β level was significantly higher, in CMM rats on day 7 after CMM. The mean percentage of FG-labeled P2X3R-positive neurons was significantly increased in TG following successive IL-1β injections into the MM for 7 days. Successive administration of an IL-1β receptor-antagonist into the MM attenuated the increase of P2X3-IR cells in the TG. ATP release from MM after 300-g pressure stimulation of MM was also significantly enhanced after CMM. Administration into MM of the selective P2X3,2/3 receptor antagonist A-317491 attenuated the decrement of HWT in CMM rats. A significant increase in HWT was also observed at 30 min after A-317491 (60 µg) injection in IL-1β-injected rats. These findings suggest that P2X3R expression associated with enhanced IL-1β expression and ATP release in MM has a possible important role in MM mechanical hyperalgesia after excessive muscular contraction.
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Affiliation(s)
- N Noma
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan.
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Nazari H, Khaleghian A, Takahashi A, Harada N, Webster NJG, Nakano M, Kishi K, Ebina Y, Nakaya Y. Cortactin, an actin binding protein, regulates GLUT4 translocation via actin filament remodeling. Biochemistry (Mosc) 2012; 76:1262-9. [PMID: 22117553 DOI: 10.1134/s0006297911110083] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Insulin regulates glucose uptake into fat and skeletal muscle cells by modulating the translocation of GLUT4 between the cell surface and interior. We investigated a role for cortactin, a cortical actin binding protein, in the actin filament organization and translocation of GLUT4 in Chinese hamster ovary (CHO-GLUT4myc) and L6-GLUT4myc myotube cells. Overexpression of wild-type cortactin enhanced insulin-stimulated GLUT4myc translocation but did not alter actin fiber formation. Conversely, cortactin mutants lacking the Src homology 3 (SH3) domain inhibited insulin-stimulated formation of actin stress fibers and GLUT4 translocation similar to the actin depolymerizing agent cytochalasin D. Wortmannin, genistein, and a PP1 analog completely blocked insulin-induced Akt phosphorylation, formation of actin stress fibers, and GLUT4 translocation indicating the involvement of both PI3-K/Akt and the Src family of kinases. The effect of these inhibitors was even more pronounced in the presence of overexpressed cortactin suggesting that the same pathways are involved. Knockdown of cortactin by siRNA did not inhibit insulin-induced Akt phosphorylation but completely inhibited actin stress fiber formation and glucose uptake. These results suggest that the actin binding protein cortactin is required for actin stress fiber formation in muscle cells and that this process is absolutely required for translocation of GLUT4-containing vesicles to the plasma membrane.
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Affiliation(s)
- H Nazari
- Department of Nutrition and Metabolism, Institute of Health Biosciences, University of Tokushima Graduate School, Tokushima, Japan
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Onishi H, Kim T, Imai Y, Hori M, Nagano H, Nakaya Y, Tsuboyama T, Nakamoto A, Tatsumi M, Kumano S, Okada M, Takamura M, Wakasa K, Tomiyama N, Murakami T. Hypervascular hepatocellular carcinomas: detection with gadoxetate disodium-enhanced MR imaging and multiphasic multidetector CT. Eur Radiol 2011; 22:845-54. [PMID: 22057248 DOI: 10.1007/s00330-011-2316-y] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2011] [Revised: 09/29/2011] [Accepted: 10/15/2011] [Indexed: 12/22/2022]
Abstract
OBJECTIVES To retrospectively compare the accuracy of detection of hypervascular hepatocellular carcinoma (HCC) by multiphasic multidetector CT and by gadoxetate disodium-enhanced MR imaging. METHODS After ethical approval, we analysed a total of 73 hypervascular HCC lesions from 31 patients suspected of having HCC, who underwent both gadoxetate disodium-enhanced MR imaging and multiphasic multidetector CT. Five blinded observers independently reviewed CT images, as well as dynamic MR images alone and combined with hepatobiliary phase MR images. Diagnostic accuracy (Az values), sensitivities and positive predictive values were compared by using the Scheffe post hoc test. RESULTS The mean Az value for dynamic and hepatobiliary phase MR combined (0.81) or dynamic MR images alone (0.78) was significantly higher than that for CT images (0.67, P < 0.001, 0.005, respectively). The mean sensitivity of the combined MR images (0.67) was significantly higher than that of dynamic MR alone (0.52, P < 0.05) or CT images (0.44, P < 0.05). The mean positive predictive values were 0.96, 0.95 and 0.94, for CT, dynamic MR alone and combined MR images, respectively. CONCLUSIONS Compared with multiphasic multidetector CT, gadoxetate disodium-enhanced MR imaging combining dynamic and hepatobiliary phase images results in significantly improved sensitivity and diagnostic accuracy for detection of hypervascular HCC. KEY POINTS Gadoxetate disodium is a new liver-specific MR imaging contrast agent. Gadoxetate disodium-enhanced MRI helps the assessment of patients with liver disease. It showed high diagnostic accuracy for the detection of hepatocellular carcinoma.
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Affiliation(s)
- Hiromitsu Onishi
- Department of Radiology, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita, Osaka, 565-0871, Japan.
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Hori M, Kim T, Murakami T, Imaoka I, Onishi H, Nakamoto A, Nakaya Y, Tomoda K, Tsutsui T, Enomoto T, Kimura T, Nakamura H. MR imaging of endometrial carcinoma for preoperative staging at 3.0 T: comparison with imaging at 1.5 T. J Magn Reson Imaging 2009; 30:621-30. [PMID: 19711413 DOI: 10.1002/jmri.21879] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
PURPOSE To prospectively compare magnetic resonance imaging (MRI) at 3.0 T and 1.5 T in the same patients for preoperative evaluation of endometrial carcinoma. MATERIALS AND METHODS Thirty consecutive patients with endometrial carcinoma underwent MRI at both 3.0 T and 1.5 T as well as surgery. Quantitative and qualitative analyses were performed. Two radiologists independently evaluated images. MR findings were compared with surgicopathologic findings. RESULTS Image homogeneity of T2-weighted images at 3.0 T was significantly inferior to that at 1.5 T (P = 0.007). The scores of image homogeneity and susceptibility artifacts were not significantly different between 3.0 T gadolinium-enhanced imaging and 1.5 T imaging (P = 0.09 and 0.36). Kappa statistics showed good interobserver agreement between the two radiologists for local-regional staging on T2-weighted images (kappa>0.6). The area under the receiver operating characteristic curve (Az) values for T2-weighted imaging in terms of myometrial invasion, cervical invasion, and lymph node metastases were 0.88 (3.0 T) versus 0.91 (1.5 T), 0.84 versus 0.83, and 0.94 versus 0.95 for reader 1, respectively. There were no significant differences between imaging at 3.0 T and at 1.5 T in Az values for either reader (P > 0.35). CONCLUSION 3.0 T MRI is an equivalent imaging modality to 1.5 T imaging for presurgical evaluation of endometrial carcinoma, although not significantly superior to 1.5 T imaging.
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Affiliation(s)
- Masatoshi Hori
- Department of Radiology, Osaka University Graduate School of Medicine, Osaka, Japan.
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16
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Maeda N, Osuga K, Mikami K, Higashihara H, Onishi H, Nakaya Y, Tatsumi M, Hori M, Kim T, Tomoda K, Nakamura H. Angiographic evaluation of hepatic arterial damage after transarterial chemoembolization for hepatocellular carcinoma. ACTA ACUST UNITED AC 2008; 26:206-12. [DOI: 10.1007/s11604-007-0216-5] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2007] [Accepted: 12/05/2007] [Indexed: 02/06/2023]
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17
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Hamamoto A, Mori M, Takahashi A, Nakano M, Wakikawa N, Akutagawa M, Ikehara T, Nakaya Y, Kinouchi Y. New water disinfection system using UVA light-emitting diodes. J Appl Microbiol 2007; 103:2291-8. [DOI: 10.1111/j.1365-2672.2007.03464.x] [Citation(s) in RCA: 120] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
AIMS To evaluate the effect of norepinephrine (NE) and related compounds on the growth of bacteria, we have examined the effect of the neuroendocrine hormone NE and related compounds on the growth of Vibrio parahaemolyticus and other human-pathogenic Vibrio species (Vibrio cholerae, Vibrio vulnificus, and Vibrio mimicus). METHODS AND RESULTS The effects on bacterial growth were examined using the serum-based medium and viable cells were counted using agar plates. We have shown that NE and its related compounds stimulate growth of V. parahaemolyticus in serum-based medium. This NE-induced growth stimulation was dependent upon the presence of transferrin. NE also stimulated growth of V. mimicus, but not V. cholerae and V. vulnificus. CONCLUSIONS These results suggest that the Vibrio species differ in their ability to respond to NE. SIGNIFICANCE AND IMPACT OF THE STUDY It is possible that NE and related compounds modulate the pathogenicity of V. parahaemolyticus and V. mimicus.
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Affiliation(s)
- M Nakano
- Department of Nutrition and Metabolism, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima, Japan
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19
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Nomura M, Uehara K, Harada K, Uemura E, Iga A, Kawano T, Nishikado A, Saito K, Nakaya Y, Ito S. Impairment of gastrointestinal motility by nitrate administration: evaluation based on electrogastrographic changes and autonomic nerve activity. Aliment Pharmacol Ther 2004; 20 Suppl 1:118-24. [PMID: 15298617 DOI: 10.1111/j.1365-2036.2004.01979.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
BACKGROUND Nitrates decrease the tone of the lower oesophageal sphincter, and may thus induce gastro-oesophageal reflux. AIM In the present study, we evaluated electrogastrographic changes and heart-rate variability before and after the administration of nitrates. METHODS In 15 patients with chest pain treated with nitrates, electrocardiography and percutaneous electrogastrography were performed before and after administration of nitrates. Autonomic nervous system function was evaluated by spectral analysis of heart-rate variability and serial changes in low frequency and high frequency power, and the low frequency/high frequency ratio were compared. Electrogastrograms were analysed by obtaining peak power amplitudes and their dominant frequencies. RESULTS After the administration of nitrates (isosorbide dinitrate), high frequency power, an index of parasympathetic nervous activity, was significantly decreased, whereas the low frequency/high frequency ratio, an index of sympathetic nervous activity, was significantly increased. The mean peak amplitude of the electrogastrogram significantly increased postprandially both before and after treatment. After isosorbide dinitrate treatment, however, mean peak amplitudes after a meal were significantly lower than those obtained before treatment. The mean dominant frequency of the electrogastrogram did not vary before and after treatment. CONCLUSIONS The present study suggests that nitrates inhibit gastrointestinal motility by decreasing autonomic nervous activity.
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Affiliation(s)
- M Nomura
- Department of Digestive Medicine, School of Medicine, Graduate School University of Tokushima, Tokushima, Japan.
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20
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Kishi F, Nomura M, Uemura E, Kageyama N, Kujime S, Kaji M, Noda Y, Kondo N, Kawaguchi T, Ozaki Y, Koshiba K, Yamaguchi K, Nakaya Y, Ito S. Evaluation of myocardial sympathetic nerve function in patients with mitral valve prolapse using iodine-123-metaiodobenzylguanidine myocardial scintigraphy. J Med 2004; 35:187-199. [PMID: 18084877] [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: 05/25/2023]
Abstract
Mitral valve prolapse (MVP) is closely related to myocardial sympathetic nerve function. This study evaluated the presence of impaired myocardial sympathetic nerve function by Iodine-123-metaiodobenzylguanidine (MIBG) scintigraphy in ten patients with MVP. For comparison, 15 healthy subjects without heart disease were investigated (control group). Single photon emission computed tomography (SPECT) and anterior planar myocardial scintigraphy were performed 15 min (initial images) and 3 hours (delayed images) after injection of MIBG (111 MBq). The location and degrees of reduced tracer uptake were evaluated. Myocardial MIBG uptake was quantified by uptake ratio of the heart (H) to upper mediastinum (M) on the anterior planar images (H/M). Percentage washout of MIBG in nine sectors of all oblique slices along the short-axis was calculated. The washout rates were higher at the inferoposterior and septal segments in patients with anterior leaflet prolapse, and at inferoposterior and lateral segments in patients with posterior leaflet prolapse. The bull's eye map showed increased washout rate in the apical and posteroseptal basal segments. There was no significant difference in the H/M ratio between MVP patients and the control group. These results indicate that MIBG can be used to evaluate localized myocardial sympathetic nerve function in MVP.
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Affiliation(s)
- F Kishi
- Department of Digestive and Cardiovascular Medicine, University of Tokushima Graduate School, Tokushima 770-8053, Japan
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21
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Uemura N, Nomura M, Inoue S, Endo J, Kishi S, Saito K, Ito S, Nakaya Y. Changes in hemodynamics and autonomic nervous activity in patients undergoing laparoscopic cholecystectomy: differences between the pneumoperitoneum and abdominal wall-lifting method. Endoscopy 2002; 34:643-50. [PMID: 12173086 DOI: 10.1055/s-2002-33252] [Citation(s) in RCA: 20] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND AND STUDY AIMS Intraoperative changes in circulatory hemodynamics and autonomic nervous activity were evaluated in 33 patients with cholelithiasis who underwent laparoscopic cholecystectomy. PATIENTS AND METHODS Of these patients, 18 were treated using a pneumoperitoneum (group G) and 15 using the abdominal wall-lifting method (group WL). Their ECG, blood pressure, arterial oxygen saturation, and expiratory carbon dioxide partial pressure were monitored. Autonomic nervous function was evaluated by spectral analysis of the heart rate. RESULTS Mean blood pressure increased significantly in group G during surgery, but did not vary in group WL during any stage of surgery. The high-frequency (HF) power, an index of parasympathetic activity, decreased significantly in group G after pneumoperitoneum. However, the HF power did not decrease significantly in group WL. The LF/HF ratio, an index of sympathetic activity, increased significantly in group G after pneumoperitoneum, but did not vary in group WL. In addition, the incidence of ventricular or supraventricular arrhythmias and the severity of the arrhythmias as determined by Lown's classification were higher in group G than in group WL. These findings suggest that intraoperative changes in autonomic nervous activity, due to increased intra-abdominal pressure, were smaller in patients undergoing laparoscopic cholecystectomy using the abdominal wall-lifting method than in those undergoing laparoscopic cholecystectomy using pneumoperitoneum. The results also demonstrated that hemodynamic changes were smaller in patients undergoing the abdominal wall-lifting method than in those undergoing pneumoperitoneum. CONCLUSIONS It was concluded that hemodynamics should be carefully monitored during pneumoperitoneum, and that the abdominal wall-lifting approach in laparoscopic cholecystectomy is a method worthy of consideration for elderly patients or those with cardiopulmonary complications.
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Affiliation(s)
- N Uemura
- Department of Gastroenterology, National Kochi Hospital, Kochi, Japan
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22
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Oura R, Nomura M, Nakaya Y, Shichijyo S, Ito S. Evaluation of the total health promotion plan in Japan, as related to health promotion effects and the prevention of lifestyle-related diseases. J Med 2002; 32:365-79. [PMID: 11958281] [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: 02/24/2023]
Abstract
The present study was undertaken to investigate whether health-promoting activities in Japan are useful for preventing the development of lifestyle-related diseases and for promoting health. One thousand, one hundred and sixty-seven Japanese workers were given a medical health check and had their maximum oxygen uptake measured according to the total health promotion plan (THP) protocol, which the Japanese Ministry of Health, Labor and Welfare is actively planning. Correlations between the maximum oxygen uptake and performance on health check items were statistically evaluated. The maximum oxygen uptake was positively correlated with the duration of a worker's ability to stand on one leg, and on the frequency with which they performed upper body weight lifting. In addition, the maximum oxygen uptake was negatively correlated with age, body weight, thickness of subcutaneous fat in the upper arms and shoulders, body fat ratios, body mass index (BMI), maximum and minimum blood pressures, resting heart rates, and total cholesterol levels. Moreover, the maximum oxygen uptake tended to be significantly higher in both male and female subjects who exercised regularly. It is suggested that maximum oxygen uptake and regular exercising play important roles in the inhibition of risk factors for ischemic heart diseases. Therefore, we believe the THP can play an important role in the primary prevention of lifestyle-related diseases. The purpose of the THP in Japan is to promote the achievement of healthy lifestyles in individual subjects, both from mental and physical perspectives. These results suggest that such efforts may help prevent the development of lifestyle-related diseases.
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Affiliation(s)
- R Oura
- Second Department of Internal Medicine, Tokushima Industrial Promotion Center, University of Tokushima, Japan
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23
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Katoh K, Nomura M, Nakaya Y, Iga A, Nada T, Hiasa A, Ochi Y, Kawaguchi R, Uemura N, Honda H, Shimizu I, Ito S. Autonomic nervous activity before and after eradication of Helicobacter pylori in patients with chronic duodenal ulcer. Aliment Pharmacol Ther 2002; 16 Suppl 2:180-6. [PMID: 11966539 DOI: 10.1046/j.1365-2036.16.s2.27.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
BACKGROUND Helicobacter pylori infection is involved in the formation of chronic peptic ulcer. However, a previously reported hypothesis concerning the involvement of central autonomic nervous disorder in this condition cannot be ruled out. AIM To use spectrum analysis of heart rate viability to examine autonomic nervous activity before and after H. pylori eradication. METHODS Twenty patients with chronic duodenal ulcer (duodenal ulcer group) and 20 age-matched normal adults (N group). In both groups, 24-h Holter electrocardiograms (ECGs) were recorded and spectrum analysis of heartrate variability was performed. In the duodenal ulcer group, Holter ECG was recorded before and after H. pylori eradication. RESULTS In the N group, analysis of heart rate variability showed that high frequency (HF) power, an index of parasympathetic activity, was high at night, while the low frequency (LF)/HF ratio, an index of sympathetic function, was high during the daytime. In the duodenal ulcer group, HF power was higher at night than during the daytime, showing a similar pattern to the N group, but the power value was higher than in the N group (P < 0.05). In the duodenal ulcer group, LF/HF at night was significantly higher than that of the N group. In addition, in the duodenal ulcer group, autonomic activity after H. pylori eradication did not differ significantly from that before H. pylori eradication. CONCLUSIONS In patients with chronic peptic ulcer, both sympatheticotonia and parasympatheticotonia may occur at night, and this abnormality in autonomic nervous activity may cause increased gastric acid secretion and gastric mucosal vasoconstriction. Abnormalities in autonomic activity persist even after H. pylori eradication, suggesting that they may be an independent risk factor in the formation of chronic peptic ulcer in addition to H. pylori infection.
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Affiliation(s)
- K Katoh
- Second Department of Internal Medicine, and Department of Nutrition, School of Medicine, University of Tokushima, Kuramoto-Cho, Tokushima, Japan
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Abstract
A complete cDNA clone of the Newcastle disease virus (NDV) vaccine strain Hitchner B1 was constructed, and infectious recombinant virus expressing an influenza virus hemagglutinin was generated by reverse genetics. The rescued virus induces a strong humoral antibody response against influenza virus and provides complete protection against a lethal dose of influenza virus challenge in mice, demonstrating the potential of recombinant NDV as a vaccine vector.
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Affiliation(s)
- T Nakaya
- Department of Microbiology, Mount Sinai School of Medicine, New York, New York 10029, USA
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25
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Li M, Marubayashi A, Nakaya Y, Fukui K, Arase S. Minoxidil-induced hair growth is mediated by adenosine in cultured dermal papilla cells: possible involvement of sulfonylurea receptor 2B as a target of minoxidil. J Invest Dermatol 2001; 117:1594-600. [PMID: 11886528 DOI: 10.1046/j.0022-202x.2001.01570.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.7] [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: 11/20/2022]
Abstract
The mechanism by which minoxidil, an adenosine-triphosphate-sensitive potassium channel opener, induces hypertrichosis remains to be elucidated. Minoxidil has been reported to stimulate the production of vascular endothelial growth factor, a possible promoter of hair growth, in cultured dermal papilla cells. The mechanism of production of vascular endothelial growth factor remains unclear, however. We hypothesize that adenosine serves as a mediator of vascular endothelial growth factor production. Minoxidil-induced increases in levels of intracellular Ca(2+) and vascular endothelial growth factor production in cultured dermal papilla cells were found to be inhibited by 8-sulfophenyl theophylline, a specific antagonist for adenosine receptors, suggesting that dermal papilla cells possess adenosine receptors and sulfonylurea receptors, the latter of which is a well-known target receptor for adenosine-triphosphate-sensitive potassium channel openers. The expression of sulfonylurea receptor 2B and of the adenosine A1, A2A, and A2B receptors was detected in dermal papilla cells by means of reverse transcription polymerase chain reaction analysis. In order to determine which of the adenosine receptor subtypes contribute to minoxidil-induced hair growth, the effects of subtype-specific antagonists for adenosine receptors were investigated. Significant inhibition in increase in intracellular calcium level by minoxidil or adenosine was observed as the result of pretreatment with 8-cyclopentyl-1,3-dipropylxanthine, an antagonist for adenosine A1 receptor, but not by 3,7-dimethyl-1-propargyl-xanthine, an antagonist for adenosine A2 receptor, whereas vascular endothelial growth factor production was blocked by both adenosine A1 and A2 receptor antagonists. These results indicate that the effect of minoxidil is mediated by adenosine, which triggers intracellular signal transduction via both adenosine A1 and A2 receptors, and that the expression of sulfonylurea receptor 2B in dermal papilla cells might play a role in the production of adenosine.
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Affiliation(s)
- M Li
- Department of Dermatology, School of Medicine, The University of Tokushima, Tokushima, Japan
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Shinkawa K, Sone S, Takahashi A, Maeda K, Tanoue N, Nakaya Y. [Effects of erythromycin and clarithromycin on chloride channels in bronchial epithelial cells]. Jpn J Antibiot 2001; 54 Suppl C:59-62. [PMID: 12575420] [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: 02/28/2023]
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27
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Takahashi A, Wada A, Ogushi K, Maeda K, Kawahara T, Mawatari K, Kurazono H, Moss J, Hirayama T, Nakaya Y. Production of beta-defensin-2 by human colonic epithelial cells induced by Salmonella enteritidis flagella filament structural protein. FEBS Lett 2001; 508:484-8. [PMID: 11728477 DOI: 10.1016/s0014-5793(01)03088-5] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We recently showed that FliC of Salmonella enteritidis increased human beta-defensin-2 (hBD-2) expression, and now describe the signaling responsible pathway. FliC increased the intracellular Ca(2+) concentration ([Ca(2+)](in)) in Caco-2 cells. The [Ca(2+)](in) increase induced by FliC was prevented by U73122 and heparin, but not by chelating extracellular Ca(2+) or pertussis toxin. The FliC-induced increase in hBD-2 promoter activity via nuclear factor kappaB (NF-kappaB) was also inhibited by chelation of intracellular Ca(2+) or by U73122. We conclude that FliC increased [Ca(2+)](in) via inositol 1,4,5-trisphosphate, which was followed by up-regulating hBD-2 mRNA expression via an NF-kappaB-dependent pathway.
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Affiliation(s)
- A Takahashi
- Department of Nutrition, School of Medicine, University of Tokushima, Japan.
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28
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Ishizawa K, Yoshizumi M, Tsuchiya K, Takishita E, Nakaya Y, Kishi K, Ebina Y, Houchi H, Minakuchi K, Tamaki T. Effects of losartan in combination with or without exercise on insulin resistance in Otsuka Long-Evans Tokushima Fatty rats. Eur J Pharmacol 2001; 430:359-67. [PMID: 11711055 DOI: 10.1016/s0014-2999(01)01405-4] [Citation(s) in RCA: 15] [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: 12/19/2022]
Abstract
Hypertension often complicates type 2 diabetes mellitus, and angiotensin converting enzyme inhibitor treatment has been shown to improve insulin resistance in such cases. However, the effect of angiotensin II type-1 (AT(1)) receptor antagonists on insulin resistance is still controversial. To gain further information on this effect, we examined the effect of losartan on insulin resistance in Otsuka Long-Evans Tokushima Fatty (OLETF) rats, a model of type 2 diabetes mellitus. Losartan administration alone lowered systolic blood pressure, but did not improve oral glucose tolerance test or insulin resistance in OLETF rats. However, the administration of losartan with exercise significantly improved both systolic blood pressure and insulin resistance relative to control OLETF rats. On the other hand, losartan treatment, regardless of exercise, increased glucose uptake in excised soleus muscle and fat cells. To explore the beneficial effect of losartan on skeletal muscle glucose uptake, we examined intracellular signaling of soleus muscle. Although Akt activity and glucose transporter type 4 (GLUT4) expressions were not affected by losartan with or without exercise, extracellular signal-regulated kinase (ERK1/2) and p38 mitogen-activated protein (MAP) kinase activities were increased by both interventions. These results indicate that angiotensin AT(1) receptor antagonist improved local insulin resistance, but not systemic insulin resistance. These findings may explain the controversy over the effect of angiotensin AT(1) receptor antagonists on insulin resistance in clinical use. The enhancing effect of angiotensin AT(1) receptor antagonist on skeletal muscle glucose uptake may be attributable to MAP kinase activation or other mechanisms rather than phosphatidylinositol 3-kinase activation.
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Affiliation(s)
- K Ishizawa
- Department of Pharmacology, University of Tokushima School of Medicine, 3-18-15 Kuramoto, 770-8503, Tokushima, Japan
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Saijo Y, Maeda K, Nakaya Y, Kamada M, Mitani R, Endo S, Irahara M, Yamano S, Aono T. Altered sensitivity to a novel vasoconstrictor endothelin-1 (1-31) in myometrium and umbilical artery of women with severe preeclampsia. Biochem Biophys Res Commun 2001; 286:964-7. [PMID: 11527394 DOI: 10.1006/bbrc.2001.5480] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
We have suggested that a novel endothelin-1 with 31 amino acids [ET-1 (1-31)] plays an important role in fetal circulation, owing to a strong contractile activity on the umbilical artery. To clarify the pathophysiological significance of ET-1 (1-31) in the development of severe preeclampsia, its contractile activities on human umbilical arteries and uterine smooth muscle from patients with preeclampsia were studied. The contraction by ET-1 (1-31) was stronger in uterine smooth muscle of the patients with severe preeclampsia than that of normal subjects. On the contrary, the constriction of umbilical artery of the patients with eclampsia was significantly weaker than that of normal pregnant women. The stronger contraction of myometrium by ET-1 (1-31) in patients with severe preeclampsia observed for the first time in the present study suggests that ET-1 (1-31) might be involved in the development of preeclampsia.
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Affiliation(s)
- Y Saijo
- Department of Obstetrics and Gynecology, University of Tokushima, Tokushima, 770-8503, Japan.
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Tsutsumi Y, Oshita S, Kawano T, Kitahata H, Tomiyama Y, Kuroda Y, Nakaya Y. Lidocaine and mexiletine inhibit mitochondrial oxidation in rat ventricular myocytes. Anesthesiology 2001; 95:766-70. [PMID: 11575552 DOI: 10.1097/00000542-200109000-00032] [Citation(s) in RCA: 13] [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: 11/25/2022]
Abstract
BACKGROUND Accumulating evidence suggests that mitochondrial rather than sarcolemmal adenosine triphosphate-sensitive K+ (K(ATP)) channels may have an important role in the protection of myocardium during ischemia. Because both lidocaine and mexiletine are frequently used antiarrhythmic drugs during myocardial ischemia, it is important to investigate whether they affect mitochondrial K(ATP) channel activities. METHODS Male Wistar rats were anesthetized with ether. Single, quiescent ventricular myocytes were dispersed enzymatically. The authors measured flavoprotein fluorescence to evaluate mitochondrial redox state. Lidocaine or mexiletine was applied after administration of diazoxide (25 microM), a selective mitochondrial K(ATP) channel opener. The redox signal was normalized to the baseline flavoprotein fluorescence obtained during exposure to 2,4-dinitrophenol, a protonophore that uncouples respiration from ATP synthesis and collapses the mitochondrial potential. RESULTS Diazoxide-induced oxidation of flavoproteins and the redox changes were inhibited by 5-hydroxydecanoic acid, a selective mitochondrial K(ATP) channel blocker, suggesting that flavoprotein fluorescence can be used as an index of mitochondrial oxidation mediated by mitochondrial K(ATP) channels. Lidocaine (10(-3) to 10 mM) and mexiletine (10(-3) to 10 mM) reduced oxidation of the mitochondrial matrix in a dose-dependent manner with an EC50 of 98+/-63 microM for lidocaine and 107+/-89 microM for mexiletine. CONCLUSIONS Both lidocaine and mexiletine reduced flavoprotein fluorescence induced by diazoxide in rat ventricular myocytes, indicating that these antiarrhythmic drugs may produce impairment of mitochondrial oxidation mediated by mitochondrial K(ATP) channels.
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Affiliation(s)
- Y Tsutsumi
- Department of Anesthesiology, Tokushima University School of Medicine, Japan.
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Nakamura T, Houchi H, Minami A, Sakamoto S, Tsuchiya K, Niwa Y, Minakuchi K, Nakaya Y. Endothelium-dependent relaxation by cilostazol, a phosphodiesteras III inhibitor, on rat thoracic aorta. Life Sci 2001; 69:1709-15. [PMID: 11665832 DOI: 10.1016/s0024-3205(01)01258-9] [Citation(s) in RCA: 58] [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: 11/23/2022]
Abstract
The relaxation effect of cilostazol, a phosphodiesterase III inhibitor, on the thoracic aorta was investigated. Cilostazol induced the relaxation of the thoracic aorta precontracted by phenylephrine in a concentration-dependent manner. The concentration-dependent relaxation was shifted to the right in the endothelium denuded aorta compared with that of intact endothelium, suggesting that this relaxation was partly dependent on endothelium. Cilostazol-induced relaxation of thoracic aorta tone was reversed by treatment with N(G)-nitro L-arginine (L-NNA), a competitive inhibitor of nitric oxide (NO) synthase. Cilostazol also significantly increased the NO level in the porcine thoracic aorta. In rats treated with cilostazol, the urinary excretion of nitrites, a stable metabolite of NO, and basal production of NO of the aortic ring were significantly greater than in those without treatment. These findings indicate that cilostazol-induced vasodilation of the rat thoracic aorta was dependent on the endothelium, which released NO from aortic endothelial cells.
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Affiliation(s)
- T Nakamura
- Department of Pharmacy, Tokushima University Hospital, Japan
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33
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Abstract
Measurements of isometric tensions of rat aortic rings revealed the fact that when aortic rings with intact endothelium were precontracted (preconditioned) for 20 min by the alpha1-adrenergic agonist phenylephrine (10 microM), the tonic level of subsequent contraction by the same agonist was depressed and/or declined regardless of the presence or absence of endothelium during the second contraction. The removal of endothelium before preconditioning showed no such phenomenon. With the use of specific blockers, involvements of adenosine or of ATP-sensitive K+ (K(ATP)) channels during preconditioning or second contraction, respectively, were evaluated. Actions of nitric oxide synthase, cyclooxygenase, P(2) ATP purinoceptors, or K(ATP) channels during preconditioning appear not to be involved. Exogenous adenosine (up to 100 microM) without endothelium could mimic the preconditioning; however, contractile preconditioning by phenylephrine, mechanical stretching, or activation of protein kinase C needed to be done. The release of adenosine and adenine nucleotides from aortic rings was augmented by phenylephrine or by mechanical stretching of the rings with intact endothelium. Our results suggest that during vasocontraction, endothelium-derived adenosine acquires an ability to protect vascular tone against subsequent repeated contractions by mediating a delayed, possibly indirect, opening of K(ATP) channels.
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Affiliation(s)
- N Harada
- Department of Nutrition, School of Medicine, University of Tokushima, Tokushima City, 770-8503 Japan
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Nakaya Y, Hattori M, Fujihara N. Participation of Protein Synthesis in in vitro Oocyte Maturation and Fertilization in Cattle. Asian Australas J Anim Sci 2001. [DOI: 10.5713/ajas.2001.754] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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35
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Miyajima H, Nomura M, Muguruma N, Okahisa T, Shibata H, Okamura S, Honda H, Shimizu I, Harada M, Saito K, Nakaya Y, Ito S. Relationship among gastric motility, autonomic activity, and portal hemodynamics in patients with liver cirrhosis. J Gastroenterol Hepatol 2001; 16:647-59. [PMID: 11422618 DOI: 10.1046/j.1440-1746.2001.02493.x] [Citation(s) in RCA: 19] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
BACKGROUND AND AIMS We examined the effects of the autonomic nervous function and the volume of portal blood flow to clarify the mechanism of the abnormal gastric motility in patients with liver cirrhosis. METHODS Heart rate variability, electrogastrogram (EGG), and volume of portal blood flow were measured before and after a meal in 27 patients with liver cirrhosis (LC group) and in 20 normal subjects (N group). Autonomic nervous function was evaluated by using spectral analysis of heart rate variability. We used the cine phase-contrast (PC) method, using magnetic resonance imaging (MRI) to measure the portal flow, while the peak frequency and spectral power of the EGG were measured at pre- and postprandial change. RESULTS The ratio of low frequency power to high frequency power (LF/HF) was significantly higher, and the HF power was significantly lower in the LC group than in the N group both before and after a meal. In both groups, the electrogastrographic peak power ratio before and after a meal showed a positive correlation with the HF ratio, and an inverse correlation with the LF/HF ratio. In addition, portal blood flow volume was significantly decreased in the LC group than in the N group. However, the increased rate of portal blood flow after a meal correlated positively with the increased rate of electrogastrographic peak power. Moreover, gastric motility was positively correlated with esophageal varices and coma scale with the use of multivariate analysis. CONCLUSIONS Parasympathetic hypofunction, sympathetic hyperfunction and portal hemodynamics were closely related with gastric motility in cirrhotic patients. In addition, gastric motility was decreased, at least in part, by the ingestion of food in cirrhotic patients because of abnormalities in autonomic functions and portal blood flow following a meal.
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Affiliation(s)
- H Miyajima
- Second Department of Internal Medicine; Department of Radiology and; Department of Nutrition, University of Tokushima, Tokushima, Japan
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Okada K, Yamagami H, Sawada S, Nakanishi M, Tamaki M, Ohnaka M, Sakamoto S, Niwa Y, Nakaya Y. The nutritional status of elderly bed-ridden patients receiving tube feeding. J Nutr Sci Vitaminol (Tokyo) 2001; 47:236-41. [PMID: 11575579 DOI: 10.3177/jnsv.47.236] [Citation(s) in RCA: 15] [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: 11/27/2022]
Abstract
Long-term enteral feeding by tube has become a frequently used procedure in elderly patients. However, only a few studies dealing with the nutritional assessment of such patients are currently available. This study was designed to clarify this issue. Anthropometric and biochemical variables, energy expenditure and dietary intake were investigated in 44 hospitalized bed-ridden patients with and without tube feeding over 65 years of age and 41 age-matched free-eating elders in a nursing home. All patients with tube feeding received enteral nutrition by nasogastric tube. The body weight, body mass index, mid-upper-arm circumference, arm muscle circumference and serum level of albumin were significantly lower in the patients with and without tube feeding, compared with free-eating elders of both genders (p<0.05). Energy intakes of the patients with tube feeding were 1,171+/-286 kcal/d (about 26 kcal/kg/d), which is comparable to the predicted total energy expenditure (1.2 x basal energy expenditure). Protein intake was 44.9+/-13.1 g/d (about 1.0 g/kg/d) and the percentage of protein per total energy was 15%. These intakes are generally considered to be optimal for bed-ridden patients receiving tube feeding. However, the incidence of protein-malnutrition, as evidenced by decreased arm muscle circumference (<80% of normal) and hypoalbuminemia (<35 g/L), in the patients with tube feeding was significantly higher than that in the healthy elders. In addition, the orally fed bed-ridden patients were also malnourished, suggesting that the bed-ridden patients easily became malnourished even if they were fed energy and protein which approximated calculated predicted values. These findings raise a problem concerning nutritional management of bed-ridden patients.
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Affiliation(s)
- K Okada
- Department of Nutrition, School of Medicine, University of Tokushima, Japan
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37
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Abstract
1. Extracts of Ginkgo biloba (EGb) and ginsenosides (GS) have been reported to induce vasorelaxation. In the present study, the role of K+ channels in the action of EGb and GS to activate nitric oxide synthase (NOS) activity was investigated in cultured endothelial cells. 2. Nitric oxide synthase activity of cultured endothelial cells detected by the reduced nicotinamide adenine dinucleotide phosphate (NADPH) histochemistry method was significantly increased after treatment with 20 microg/mL EGb or 40 microg/mL GS plus 10 mmol/L L-arginine. The effect was completely abolished by the addition of 0.5 micromol/L Nomega-nitro-L-arginine, an inhibitor of NOS, to the incubation medium and partially inhibited by 10 micromol/L tetraethylammonium (TEA), an inhibitor of Ca2+-activated K+ (KCa) channels. 3. Application of EGb to the intracellular surface of excised inside-out patches activated K+ channels in a concentration-dependent manner in the concentration range 1-100 microg/mL. Channel activity was also activated by application of GS at concentrations ranging from 1 to 300 microg/mL. The modulation of channel activity was inhibited by 0.5 mmol/L TEA but not by 0.5 mmol/L glibenclamide, an inhibitor of ATP-sensitive K+ channels. 4. Thus, in cultured endothelial cells, the increase in NOS activity induced by EGb or GS depends on the activity of KCa channels. These compounds may regulate nitric oxide release by changing the cell membrane potential in vascular endothelial cells.
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Affiliation(s)
- Z Li
- Department of Pharmacology, Hunan Medical University, Changsha, China
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38
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Li Z, Nakaya Y, Niwa Y, Chen X. KCa Channel-Opening Activity Of Ginkgo Biloba Extracts And Ginsenosides In Cultured Endothelial Cells. Clin Exp Pharmacol Physiol 2001. [DOI: 10.1046/j.1440-1681.2001.3456.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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39
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Abe N, Watanabe T, Toda H, Machida H, Suzuki K, Masaki T, Mori T, Sugiyama M, Atomi Y, Nakaya Y. Prognostic significance of carcinoembryonic antigen levels in peritoneal washes in patients with gastric cancer. Am J Surg 2001; 181:356-61. [PMID: 11438272 DOI: 10.1016/s0002-9610(01)00585-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [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: 12/26/2022]
Abstract
BACKGROUND Peritoneal metastasis is the most frequent cause of death in patients with gastric cancer. Detection of free cancer cells in the peritoneal cavity at the time of surgery, therefore, is considered to be of great value in predicting the peritoneal recurrence and accordingly in the prognosis in patients with gastric cancer. This study examined the clinical significance of intraoperative determination of carcinoembryonic antigen (CEA) levels in peritoneal washes (pCEA) in patients with gastric cancer. METHODS CEA levels in peritoneal washes were correlated retrospectively with several clinicopathologic factors including clinical outcome in 56 patients with resectable gastric cancer. RESULTS Among several clinicopathologic factors, the depth of tumor invasion significantly and independently correlated with pCEA levels as revealed by multivariate stepwise logistic regression analysis. A significant difference in overall survival rates was observed between pCEA-positive and pCEA-negative groups: 5-year survival rates were 95.7% in pCEA-negative and 20% in pCEA-positive patients (P <0.0001). Multivariate analysis indicated that pCEA level is a statistically significant independent prognostic factor for the survival of patients with gastric cancer, and is an important factor for predicting peritoneal recurrence. CONCLUSIONS pCEA could be a potential predictor of a poor prognosis as well as peritoneal recurrence in patients with gastric cancer. We believe that this information could contribute to determining the optimal intraoperative and postoperative therapeutic plan including adjuvant chemotherapy of gastric cancer.
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Affiliation(s)
- N Abe
- First Department of Surgery, Kyorin University School of Medicine, 6-20-2 Shinkawa, Mitaka City, 181-8611, Tokyo, Japan.
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40
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Abstract
Protease-activated receptor-2 (PAR-2) and/or effector cell protease receptor-1 (EPR-1) may mediate the direct cellular actions of coagulation factor Xa in some cultured cell lines. The present study examined if factor Xa could actually evoke relaxation through either of these receptor systems in isolated rat aorta. Factor Xa at 8.5-85 nM, like the PAR-2-activators trypsin and SLIGRL-NH(2), produced nitric oxide-dependent relaxation in the precontracted aortic rings. PAR-2 desensitization abolished relaxation responses to factor Xa as well as trypsin in the rings. The factor Xa interepidermal growth factor synthetic peptide L(83)FTRKL(88)(G)-NH(2), known to block factor Xa binding to EPR-1, failed to inhibit factor Xa-evoked relaxation in the preparations. Our findings provide evidence that factor Xa evokes relaxation by activating PAR-2, but independently of EPR-1, in the rat aorta. The factor Xa-PAR-2 pathway might thus contribute to the severe hypotension during sepsis, in which multiple coagulation factors including factor X would become activated and PAR-2 would be induced.
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Affiliation(s)
- A Kawabata
- Department of Pathophysiology & Therapeutics, Kinki University, Higashi-Osaka, 577-8502, Japan.
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41
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Hayashi T, Nomura M, Honda H, Tezuka K, Torisu R, Takeuchi Y, Nakaya Y, Ito S. Evaluation of autonomic nervous function during upper gastrointestinal endoscopy using heart rate variability. J Gastroenterol 2001; 35:815-23. [PMID: 11085490 DOI: 10.1007/s005350070018] [Citation(s) in RCA: 13] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
To investigate autonomic nervous function during upper gastrointestinal endoscopy, we analyzed R-R interval variability from electrocardiograms obtained during endoscopy. Holter electrocardiogram recordings were made before and after premedication, and during endoscopy. Time- and frequency-domain analyses of heart rate variability were performed in 54 subjects premedicated with scopolamine butylbromide (SB group) and in 66 subjects premedicated with glucagon (G group). To determine the effect of autonomic imbalance on arrhythmia generation during endoscopy, subjects with arrhythmias (A group) were compared with subjects without arrhythmias (N group). In the SB group, high frequency spectral power (HF power; 0.15 to 0.40 Hz), which reflects parasympathetic activity, decreased significantly after premedication, and decreased further during endoscopy (P < 0.01). Moreover, HF power before premedication or during endoscopy in the A group was significantly lower than that in the N group (P < 0.01). This study suggests that the measurement of HF power prior to endoscopy can identify subjects with reduced HF power. This should allow the prevention of cardiovascular complications related to premedication and endoscope insertion.
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Affiliation(s)
- T Hayashi
- Kagawa Prefectural Cancer Detection Center, Kagawa, Japan
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Abstract
The purpose of this study was to determine whether myocardial imaging using technetium-99m tetrofosmin can noninvasively identify myocardial damage in hypertrophic cardiomyopathy (HC). The study consisted of 10 patients with apical HC, 10 with asymmetric septal HC (ASH) group, 5 with dilated cardiomyopathy (DC)-like group, and 20 healthy subjects. With use of a bull's-eye map of single-photon emission computed tomographic imaging, the total defect score of tetrofosmin and the washout rate were assessed in 5 segments (septum, and anterior, lateral, and inferior walls, and apex) of the left ventricle. A localized increase in defect score and washout rate was observed in the hypertrophied region in the group with apical HC. An increased washout rate was observed in the ASH group regardless of hypertrophy, suggesting that tetrofosmin retention by the mitochondria was impaired in the entire left ventricular wall. The washout rate was further increased at all segments in the DC-like group versus the ASH group. Tetrofosmin retention by mitochondria was impaired in the entire left ventricular wall in the ASH group and was increased further in the DC-like group. The dysfunction of myocardial cells was limited to the hypertrophied region in the apical HC group.
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Affiliation(s)
- S Morishita
- Second Department of Internal Medicine, University of Tokushima, Japan.
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43
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Kawabata A, Kuroda R, Nakaya Y, Kawao N, Nishikawa H. Ex Vivo Evidence That the Phosphodiesterase Inhibitor IBMX Attenuates the Up-Regulation of PAR-2 in the Endotoxemic Rat Aorta. Thromb Res 2001; 101:513-5. [PMID: 11370637 DOI: 10.1016/s0049-3848(00)00425-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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44
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Ge N, Nakamura Y, Nakaya Y, Sone S. Interferon-gamma activates outwardly rectifying chloride channels in the human bronchial epithelial cell line BEAS-2B. J Med Invest 2001; 48:97-101. [PMID: 11286023] [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] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
The mechanism of increased chloride currents by inflammatory cytokine, interferon-gamma (IFN-gamma), was investigated in cultured a human bronchial epithelial cell line (BEAS-2B) using cell-attached and inside-out patch configurations. The channel sensitive to chloride ion was activated by forskolin, an activator of adenylate cyclase, or 100 microM dibutyryl 5'-cyclic monophosphate in cell-attached configurations. The conductance of this channel was 40 +/- 4 pS in symmetrical 150 mM chloride solution between membrane potentials of 0 to mV, and this channel was blocked by 500 microM 4,4'-diisothiocyanatostilbene-2,2'-disulfonic acid (DIDS), suggesting that this channel was an outwardly rectifying chloride channel (ORCC). Treatment of 10-1000 U/ml IFN-gamma for 3 hours, but not IFN-alpha, significantly increased channel activities of ORCC, and this activation was observed at least 24 hours after treatment. Erythromycin, a macrolide antibiotic, at a concentration of 100 microM inhibited the activation of ORCC induced by IFN-gamma. The findings of the present study indicate that increased mucus secretion during inflammation might be partly due to activation of chloride permeability by cytokine and erythromycin might improve oversecretion of mucus from bronchial epithelium by blocking ORCC.
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Affiliation(s)
- N Ge
- Third Department of Internal Medicine, University of Tokushima School of Medicine, Tokushima, Japan
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45
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Nada T, Nomura M, Iga A, Kawaguchi R, Ochi Y, Saito K, Nakaya Y, Ito S. Autonomic nervous function in patients with peptic ulcer studied by spectral analysis of heart rate variability. J Med 2001; 32:333-47. [PMID: 11958279] [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: 04/18/2023]
Abstract
This study is intended to clarify the relationship between occurrence of peptic ulcer disease and dysfunction of the autonomic nervous system. We studied heart rate variability and assessed the circadian rhythm of autonomic nervous function in 20 patients with peptic ulcer (PU group) and 20 age-matched healthy controls (N group) using 24-hour Holter monitoring. Moreover, the relationship between gastric juice secretion and autonomic activity was examined under intravenous injection of insulin or butylscopolamine in adult mongrel dogs. High frequency spectral (HF) power, an indicator of parasympathetic tone, was increased markedly at night in the PU group. Low frequency spectral (LF) power, an indicator of sympathetic tone modified by vagal tone, was higher during the day than at night in the N group, whereas this normal circadian rhythm of LF power disappeared in 11 cases (55%) in the PU group. In addition, the LF power was increased significantly at night (p<0.01) in the PU group. HF power and gastric juice secretion was increased by the administration of insulin. High sympatho-vagal tone at night may result in spasm of gastric arteries and excess secretion of gastric acid in the PU group. These results suggest that the nocturnal acceleration of LF, HF, and LF/HF is related to peptic ulcer diseases.
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Affiliation(s)
- T Nada
- Second Department of Internal Medicine, School of Medicine, University of Tokushima, Japan
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46
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Masuyama R, Nakaya Y, Tanaka S, Tsurukami H, Nakamura T, Watanabe S, Yoshizawa T, Kato S, Suzuki K. Dietary phosphorus restriction reverses the impaired bone mineralization in vitamin D receptor knockout mice. Endocrinology 2001; 142:494-7. [PMID: 11145614 DOI: 10.1210/endo.142.1.8050] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Deficiency of vitamin D, which is required for calcium homeostasis, causes rickets with hypocalcemia and hypophosphatemia, resulting in growth retardation and impaired bone formation. Mice lacking the vitamin D receptor (VDR) develop the typical features of rickets, establishing that VDR plays a role in controlling the actions of vitamin D. Normalization of impaired mineral homeostasis in VDR KO mice fed a diet supplemented with high concentrations of calcium (2%) and phosphorus (1.25%) is reported to reverse the malformation of bone and the growth retardation as well. However, the relationship between mobilization of phosphorus and calcium and nuclear control of vitamin D actions remains unclear. The present study was undertaken to determine the effect of dietary phosphorus on mineral mobilization and bone mineralization. We report here that feeding a diet supplemented with a restricted amount of phosphorus (0.25%) and a normal amount of calcium (0.5%) for 4 weeks reverses the growth retardation and the impaired mineralization in VDR KO mice, as does a high-calcium and high-phosphorus diet (Ca: 2%; P: 1.25%). Thus, the present study suggests that mobilization of calcium and mobilization of phosphorus are differentially regulated through vitamin D-dependent and -independent systems, and that intake of calcium and phosphorus in the proper ratio is important for mineral homeostasis and bone mineralization.
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Affiliation(s)
- R Masuyama
- Department of Nutritional Science, Tokyo University of Agriculture, Japan
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47
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Abstract
Ginsenosides (GS), an extract of Panax ginseng, have been reported to be effective in inducing vascular relaxation mediated by nitric oxide (NO) release. The present experiments were designed to determine whether this GS-induced vasorelaxation also involves Ca2+ -activated K+ (KCa) channels in vascular smooth muscle cells (VSMC) in addition to endothelium-derived NO. GS induced vasorelaxation in rat aortic rings, which had been precontracted with phenylephrine, in a concentration-dependent manner. This GS-induced relaxation was partially reversed by tetraethylammonium (TEA), an inhibitor of KCa channels; methylene blue (MB), an inhibitor of soluble guanylate cyclase; as well as Nomega-nitro-L-arginine (L-NNA), but not by glybenclamide. In cultured VSMC and endothelial cells, KCa channels were activated by GS. This action was abolished by TEA, but was not blocked by glybenclamide. In addition, the GS-induced activity of KCa channels was partially inhibited by MB or H-8. These results indicate that the activation of KCa channels involved, at least in part, the GS-induced vasorelaxation of rat aorta.
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MESH Headings
- Analgesics/pharmacology
- Animals
- Aorta/drug effects
- Aorta/physiology
- Arginine/pharmacology
- Calcium/metabolism
- Cells, Cultured
- Endothelium, Vascular/cytology
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/physiology
- Enzyme Inhibitors/pharmacology
- Ginsenosides
- Male
- Methylene Blue/pharmacology
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/physiology
- Nitric Oxide/antagonists & inhibitors
- Nitric Oxide/metabolism
- Nitroarginine/pharmacology
- Potassium Channels/drug effects
- Potassium Channels/physiology
- Rats
- Rats, Wistar
- Saponins/pharmacology
- Tetraethylammonium/pharmacology
- Vasodilation/physiology
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Affiliation(s)
- Z Li
- Department of Nutrition, School of Medicine, The University of Tokushima, Tokushima City, Japan
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48
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Abstract
Mechanism of Nitric oxide (NO) production by ginsenosides was investigated in cultured porcine endothelial cells. Beta-nicotinamide adenine dinucleotide phosphate (beta-NADPH) staining showed that the NO production was significantly enhanced by the presence of 40 microg/ml ginsenosides with 10 microM L-arginine after 12 h incubation. NO production was suppressed by addition of 0.5 microM Nomega-Nitro-L-arginine (L-NNA), an inhibitor of NO synthases (NOSs), to the incubation medium. In addition, the immunoreactive signals of inducible NOS (iNOS) were appeared in endothelial cells after 12-h incubation of ginsenosides, whereas the signals were not observed in non-treated cells. Our findings suggest that ginsenosides can enhance NO production by induction of iNOS in addition to its direct effect on endothelial cells by increasing intracellular Ca2+ concentration.
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Affiliation(s)
- Z Li
- Department of Nutrition, School of Medicine, Tokushima University, Japan
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49
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Kurokawa Y, Kojima K, Kagawa S, Minami K, Nakaya Y. Biphasic action of phenylephrine on the Ca(2+)-activated K+ channel of human prostatic smooth muscle cells. Urol Int 2000; 60:156-60. [PMID: 9644785 DOI: 10.1159/000030241] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The elevation of cytosolic Ca2+ ([Ca2+]i) is known to regulate smooth muscle contractility. A physiological concentration of phenylephrine induced the elevation in [Ca2+]i of human prostatic smooth muscle cells; however, contraction of prostatic tissues in vitro needs a higher concentration of phenylephrine than the physiological level. To investigate this discrepancy, we investigated the functional importance of the Ca(2+)-activated K+ channel (KCa channel) of human prostatic smooth muscle cells in phenylephrine-induced contraction. Using the patch-clamp technique, the KCa channel of human prostatic smooth muscle cells was activated by phenylephrine at a physiological concentration (10(-7)-10(-5) M) but was inhibited at a higher concentration (10(-4)-10(-3) M). Phenylephrine (10(-3) M) also inhibited the KCa channel which was activated by 10 microM A23187, a calcium ionophore. Similar inhibition was obtained with 1 microM phorbol 12-myristate 13-acetate, an activator of protein kinase C (C-kinase). Both inhibitions were reversed by subsequent application of 1 nM staurosporine, a protein kinase inhibitor. These results suggested that C-kinase mediated the phenylephrine-induced inhibition of the KCa channel. In this study, a physiological concentration of phenylephrine induced activation of the KCa channel of human prostatic smooth muscle cells, which brought about membrane hyperpolarization and relaxation of human prostatic smooth muscle cells. The regulation of the KCa channel by phenylephrine may explain the need of a high concentration of phenylephrine for the contraction of prostatic tissue.
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Affiliation(s)
- Y Kurokawa
- Department of Urology, School of Medicine, University of Tokushima, Japan
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50
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Niwa Y, Nagata N, Oka M, Toyoshima T, Akiyoshi H, Wada T, Nakaya Y. Production of nitric oxide from endothelial cells by 31-amino-acid-length endothelin-1, a novel vasoconstrictive product by human chymase. Life Sci 2000; 67:1103-9. [PMID: 10954044 DOI: 10.1016/s0024-3205(00)00700-1] [Citation(s) in RCA: 17] [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: 11/30/2022]
Abstract
Human chymase selectively converts big endothelin (ET)-1 to 31-amino-acid-length ET-1 [ET-1(1-31)]. In this study we examined effect of ET-1(1-31) on endothelial function. ET-1(1-31) evoked contraction in a concentration-dependent manner at > 10(-8) M, which was about 10 times weaker than that of conventional ET-1 [ET-1(1-21)]. BQ485, an ETA receptor antagonist, completely abolished ET-1(1-31)-induced contraction, but BQ788, an ETB receptor antagonist, slightly enhanced it, suggesting that ET-1(1-31) relaxes artery via endothelium. On endothelial cells, ET-1(1-21) and ET-1(1-31) increased [Ca2+]i and produced NO, both of which were significantly inhibited by BQ788 and not by BQ485. These results indicate that ET-1(1-31) increased [Ca2+]i and produced NO in endothelial cells through ETB receptor similarly with ET-1(1-21), although slight difference in effect on smooth muscle cells.
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Affiliation(s)
- Y Niwa
- Department of Nutrition, The University of Tokushima, School of Medicine, Japan
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