1
|
Kataoka M, Saitoh T, Kawashima K, Yazaki T, Sonoyama H, Okimoto E, Oka A, Mishima Y, Mishiro T, Oshima N, Shibagaki K, Tobita H, Moriyama I, Ishimura N, Nagase M, Hirahara N, Tajima Y, Ishihara S. Primary Extragastrointestinal Stromal Tumor of Greater Omentum with Intraperitoneal Bleeding. Intern Med 2021; 60:3413-3419. [PMID: 34024850 PMCID: PMC8627809 DOI: 10.2169/internalmedicine.6519-20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Accepted: 03/26/2021] [Indexed: 11/06/2022] Open
Abstract
Gastrointestinal stromal tumors (GISTs) develop in the digestive tract, mainly in the stomach, small intestine, colon, or esophagus. However, primary tumors with the same pathologic features as GISTs have been reported to occur outside of the digestive tract and are called extragastrointestinal stromal tumor (EGIST). We herein report a rare case of EGIST arising from the greater omentum in a patient with abdominal pain caused by intraperitoneal bleeding from the tumor.
Collapse
Affiliation(s)
- Masatoshi Kataoka
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
- Division of Hepatology, Shimane University Hospital, Japan
| | - Tsukasa Saitoh
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
- Division of Gastroenterology, Matsue Red Cross Hospital, Japan
| | - Kousaku Kawashima
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
- Inflammatory Bowel Disease Center, Shimane University Hospital, Japan
| | - Tomotaka Yazaki
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
- Division of Hepatology, Shimane University Hospital, Japan
| | - Hiroki Sonoyama
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
| | - Eiko Okimoto
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
| | - Akihiko Oka
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
| | - Yoshiyuki Mishima
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
| | - Tsuyoshi Mishiro
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
| | - Naoki Oshima
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
| | - Kotaro Shibagaki
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
- Division of Endoscopy, Shimane University Hospital, Japan
| | - Hiroshi Tobita
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
- Division of Hepatology, Shimane University Hospital, Japan
| | - Ichiro Moriyama
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
- Cancer Center, Shimane University Hospital, Japan
| | - Norihisa Ishimura
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
| | - Mamiko Nagase
- Department of Organ Pathology, Shimane University Faculty of Medicine, Japan
| | - Noriyuki Hirahara
- Department of Digestive and General Surgery, Shimane University Faculty of Medicine, Japan
| | - Yoshitsugu Tajima
- Department of Digestive and General Surgery, Shimane University Faculty of Medicine, Japan
| | - Shunji Ishihara
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
- Inflammatory Bowel Disease Center, Shimane University Hospital, Japan
| |
Collapse
|
2
|
Niizeki K, Saitoh T. Unobtrusive slow wave activity monitoring by phase coupling of respiratory sinus arrhythmia during sleep using a PVDF sensor. Sleep Med 2019. [DOI: 10.1016/j.sleep.2019.11.782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
3
|
Sakakibara T, Suwa K, Kaneko Y, Akita K, Sato R, Mogi S, Naruse Y, Ohtani H, Saitoh T, Saotome M, Urushida T, Maekawa Y. P585Intra left ventricular hemodynamics assessed using 4D flow MRI in the patient with left ventricular thrombus. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz747.0194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Early detection of left ventricular mural thrombus (LVT) in patients with reduced ejection fraction (EF) is crucial in prevention of arterial embolism. 3D-cine phase-contrast magnetic resonance imaging (4D flow MRI) can visualize the intra-LV vortex flow in diastole and quantify the maximum flow velocity (Vmax) at the apex. it remains, however, unknown whether 4D flow MRI is useful for detecting LVT.
Purpose
The purpose of our study is to examine the intra-LV vortex formation and flow velocity in patients with severe LV dysfunction using 4D Flow MRI, and to compare differences in intra-LV flow dynamics between patients with and without LVT. We also examined the diagnostic accuracy to detect LVT by 4D flow MRI.
Methods
Twenty-nine patients with impaired LV function (LVEF 25.8±7.4%, 62.5±12.3 years old, 24 males, 11 with ischemic cardiomyopathy, 9 with LVT) underwent 4D flow MRI from January 2012 to August 2018 in our institution. Intra-LV vortex size was evaluated as vortex/LV area ratio by streamline imaging (Figure 1). The diagnostic accuracy to predict LVT by vortex size and Vmax at the apex was determined by ROC analysis.
Results
The vortex was smaller (vortex/LV area ratio; 30.6±7.0% vs. 45.1±9.0%, p<0.05) and Vmax at the apex was lower (0.20±0.04 m/s vs. 0.28±0.09 m/s, p=0.013) in patients with LVT compared to those without LVT. The AUC was 0.789 for Vmax (cut-off value=0.226 m/s, sensitivity=0.889, specificity=0.650) and was 0.900 for vortex/LV area ratio (cut-off value=34.7%, sensitivity=0.889, specificity=0.850).
Figure 1
Conclusion
The smaller size of intra-LV vortex and the lower flow velocity at the LV apex may have association with LVT formation in patients with reduced EF. 4D flow MRI might be useful to predict LVT formation. Large scale longitudinal study is warranted to evaluate the incidence of LVT in the patients with lower flow velocity.
Acknowledgement/Funding
None
Collapse
Affiliation(s)
- T Sakakibara
- Hamamatsu University School of Medicine, Cardiology, Hamamatsu, Japan
| | - K Suwa
- Hamamatsu University School of Medicine, Cardiology, Hamamatsu, Japan
| | - Y Kaneko
- Hamamatsu University School of Medicine, Cardiology, Hamamatsu, Japan
| | - K Akita
- Hamamatsu University School of Medicine, Cardiology, Hamamatsu, Japan
| | - R Sato
- Hamamatsu University School of Medicine, Cardiology, Hamamatsu, Japan
| | - S Mogi
- Hamamatsu University School of Medicine, Cardiology, Hamamatsu, Japan
| | - Y Naruse
- Hamamatsu University School of Medicine, Cardiology, Hamamatsu, Japan
| | - H Ohtani
- Hamamatsu University School of Medicine, Cardiology, Hamamatsu, Japan
| | - T Saitoh
- Hamamatsu University School of Medicine, Emergency Medicine, Hamamatsu, Japan
| | - M Saotome
- Hamamatsu University School of Medicine, Cardiology, Hamamatsu, Japan
| | - T Urushida
- Hamamatsu University School of Medicine, Cardiology, Hamamatsu, Japan
| | - Y Maekawa
- Hamamatsu University School of Medicine, Cardiology, Hamamatsu, Japan
| |
Collapse
|
4
|
Hiroshima Y, Nitta K, Saitoh T, Ohno T, Shinoda K, Tamaki Y. EP-1391 Stereotactic body radiotherapy using a new real-time tumor tracking system and fiducial markers. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)31811-0] [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]
|
5
|
Hida S, Igarashi Y, Hirose K, Saitoh T, Hatano T, Morishima T, Yamashita J, Murata N, Goto M, Itoh R, Chikamori T. 2459Diagnostic value of simultaneous dual-isotope imaging with 99mTc-sestamibi and 123I-BMIPP using cadmium-zinc-telluride SPECT system in patients with acute myocardial infarction. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.2459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- S Hida
- Tokyo Medical University, Tokyo, Japan
| | | | - K Hirose
- Tokyo Medical University, Tokyo, Japan
| | - T Saitoh
- Tokyo Medical University, Tokyo, Japan
| | - T Hatano
- Tokyo Medical University, Tokyo, Japan
| | | | | | - N Murata
- Tokyo Medical University, Tokyo, Japan
| | - M Goto
- Tokyo Medical University, Tokyo, Japan
| | - R Itoh
- Tokyo Medical University, Tokyo, Japan
| | | |
Collapse
|
6
|
Mishiro T, Oka K, Kuroki Y, Takahashi M, Tatsumi K, Saitoh T, Tobita H, Ishimura N, Sato S, Ishihara S, Sekine J, Wada K, Kinoshita Y. Oral microbiome alterations of healthy volunteers with proton pump inhibitor. J Gastroenterol Hepatol 2018; 33:1059-1066. [PMID: 29105152 DOI: 10.1111/jgh.14040] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Revised: 10/26/2017] [Accepted: 10/26/2017] [Indexed: 12/17/2022]
Abstract
BACKGROUND AND AIM Acid suppressive agents including proton pump inhibitors (PPIs) are used as first-line treatment for various acid-related gastrointestinal disorders. Although known to profoundly reduce gastric acid production, their influence on inhibition of acid secretion as part of the function of the gastrointestinal tract microbiome remains to be elucidated. The aim of the present study was to examine the effects of PPI usage on oral and gut microbiota in healthy volunteers. METHODS Ten healthy adult volunteers receiving no medications were enrolled. We obtained fecal, saliva, and periodontal pocket fluid samples from the subjects before and after 4 weeks of once daily administrations of 20-mg esomeprazole. The effects of PPI administration on bacterial communities were investigated using a 16S rRNA gene sequencing method. RESULTS Species richness (alpha diversity) was significantly different among the salivary, periodontal pocket, and fecal samples. Furthermore, the measurements for UniFrac distances, despite inter-individual variations (beta diversity), of the microbiota structure of saliva and periodontal pocket and feces samples were clearly separated from each other. The salivary samples showed significant differences between alpha and beta diversity measurements before and after administration of the PPI for 4 weeks. Meanwhile, taxon-based analysis indicated that PPI administration raised the ratio of Streptococcus organisms in fecal samples, suggesting a potentially unfavorable effect leading to gut microbiota alteration. Moreover, alterations of the microbiota in the oral carriage microbiome along with bacterial overgrowth (Streptococcus) and decreases in distinct bacterial species (Neisseria and Veillonella) were observed. CONCLUSIONS These results suggest that PPIs cause both oral and gut microbiota alterations.
Collapse
Affiliation(s)
- Tsuyoshi Mishiro
- Department of Gastroenterology and Hepatology, Faculty of Medicine, Shimane University, Izumo, Shimane, Japan
| | - Kentaro Oka
- Tokyo R&D Center, Miyarisan Pharmaceutical Co. Ltd., Saitama, Japan
| | - Yasutoshi Kuroki
- Tokyo R&D Center, Miyarisan Pharmaceutical Co. Ltd., Saitama, Japan
| | | | - Kasumi Tatsumi
- Department of Oral and Maxillofacial Surgery, Faculty of Medicine, Shimane University, Izumo, Shimane, Japan
| | - Tsukasa Saitoh
- Department of Gastroenterology and Hepatology, Faculty of Medicine, Shimane University, Izumo, Shimane, Japan
| | - Hiroshi Tobita
- Department of Gastroenterology and Hepatology, Faculty of Medicine, Shimane University, Izumo, Shimane, Japan
| | - Norihisa Ishimura
- Department of Gastroenterology and Hepatology, Faculty of Medicine, Shimane University, Izumo, Shimane, Japan
| | - Shuichi Sato
- Division of Gastrointestinal Endoscopy, Shimane University Hospital, Izumo, Shimane, Japan
| | - Shunji Ishihara
- Department of Gastroenterology and Hepatology, Faculty of Medicine, Shimane University, Izumo, Shimane, Japan
| | - Joji Sekine
- Department of Oral and Maxillofacial Surgery, Faculty of Medicine, Shimane University, Izumo, Shimane, Japan
| | - Koichiro Wada
- Department of Pharmacology, Faculty of Medicine, Shimane University, Izumo, Shimane, Japan
| | - Yoshikazu Kinoshita
- Department of Gastroenterology and Hepatology, Faculty of Medicine, Shimane University, Izumo, Shimane, Japan
| |
Collapse
|
7
|
Saitoh T, Sato S, Yazaki T, Tobita H, Miyake T, Ishihara S, Katsube T, Kitagaki H, Kinoshita Y. Progression of Hepatic Hypovascular Nodules with Hypointensity in the Hepatobiliary Phase of Gd-EOB-DTPA-enhanced MRI in Hepatocellular Carcinoma Cases. Intern Med 2018; 57:165-171. [PMID: 29033416 PMCID: PMC5820032 DOI: 10.2169/internalmedicine.8801-16] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Objective We investigated the possible factors for predicting the future progression to hepatocellular carcinoma (HCC) from hypovascular nodules detected in the hepatobiliary phase of gadolinium-ethoxybenzyl-diethylenetriamine pentaacetic acid-enhanced magnetic resonance imaging (Gd-EOB-DTPA-MRI). Methods A total of 91 hypovascular nodules detected by Gd-EOB-DTPA-MRI in 28 patients without any past history of treatment for HCC were retrospectively examined. The nodules were categorized into those with and without HCC progression, then comparisons were made to identify any factors possibly related to a progression to HCC in each case. In addition, we performed a receiver operating characteristics (ROC) analysis to determine the cut-off value for the initial nodule size for predicting HCC progression within 12 months. Results The observation period of the 28 patients was 1,172.6±95.6 (mean±standard error) days. The number of hypovascular nodules that changed to hypervascular ones was 15 (16.5%), and the cumulative incidence of hypervascular transformation was 7.1% at 12 months and 12.7% at 24 months. Of all 91 hypovascular nodules, 33 in 18 patients were diagnosed as HCC based on hypervascular transformation and/or size enlargement, while the remaining 58 did not progress to HCC. There was no significant difference regarding the background characteristics between the HCC progressed and non-progressed groups according to a multivariate analysis, or between the patients who had nodules that progressed to HCC and those with nodules that did not progress to HCC. Regarding HCC progression at 12 months, the area under the ROC (AUROC) had a level of 0.745 and showed that an initial nodule cut-off size of 9.5 mm (sensitivity, 57.9%; specificity, 87.3%) was predictive. Conclusion In patients without a past HCC treatment history, it is difficult to determine whether hypovascular nodules have a high risk of progression to HCC based on background factors alone.
Collapse
Affiliation(s)
- Tsukasa Saitoh
- Department of Gastroenterology, Matsue Red Cross Hospital, Japan
| | - Shuichi Sato
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
| | - Tomotaka Yazaki
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
| | - Hiroshi Tobita
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
| | - Tatsuya Miyake
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
| | - Shunji Ishihara
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
| | - Takashi Katsube
- Department of Radiology, Shimane University Faculty of Medicine, Japan
| | - Hajime Kitagaki
- Department of Radiology, Shimane University Faculty of Medicine, Japan
| | - Yoshikazu Kinoshita
- Department of Internal Medicine II, Shimane University Faculty of Medicine, Japan
| |
Collapse
|
8
|
Spiridonova LN, Valchuk OP, Red’kin YA, Saitoh T, Kryukov AP. Phylogeography and demographic history of Siberian rubythroat Luscinia calliope. RUSS J GENET+ 2017. [DOI: 10.1134/s1022795417080105] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
9
|
Hida S, Chikamori T, Igarashi Y, Saitoh T, Hirose K, Yamashita J, Murata N, Hoshino K, Hatano T, Tanaka H, Yamashina A. P2969Comparison of diagnostic performance of cadmium-zinc-telluride camera system between 201Tl and 99mTc-radiotracers as assessed by fractional flow reserve. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p2969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
10
|
Ishida Y, Saitoh T, Mochiku T, Nakane T, Hirata K, Shin S. Quasi-particles ultrafastly releasing kink bosons to form Fermi arcs in a cuprate superconductor. Sci Rep 2016; 6:18747. [PMID: 26728626 PMCID: PMC4700524 DOI: 10.1038/srep18747] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [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: 08/20/2015] [Accepted: 11/25/2015] [Indexed: 01/12/2023] Open
Abstract
In a conventional framework, superconductivity is lost at a critical temperature (Tc) because, at higher temperatures, gluing bosons can no longer bind two electrons into a Cooper pair. In high-Tc cuprates, it is still unknown how superconductivity vanishes at Tc. We provide evidence that the so-called ≲70-meV kink bosons that dress the quasi-particle excitations are playing a key role in the loss of superconductivity in a cuprate. We irradiated a 170-fs laser pulse on Bi2Sr2CaCu2O8+δ and monitored the responses of the superconducting gap and dressed quasi-particles by time- and angle-resolved photoemission spectroscopy. We observe an ultrafast loss of superconducting gap near the d-wave node, or light-induced Fermi arcs, which is accompanied by spectral broadenings and weight redistributions occurring within the kink binding energy. We discuss that the underlying mechanism of the spectral broadening that induce the Fermi arc is the undressing of quasi-particles from the kink bosons. The loss mechanism is beyond the conventional framework, and can accept the unconventional phenomena such as the signatures of Cooper pairs remaining at temperatures above Tc.
Collapse
Affiliation(s)
- Y Ishida
- ISSP, University of Tokyo, Kashiwa-no-ha, Kashiwa, Chiba 277-8581, Japan
| | - T Saitoh
- ISSP, University of Tokyo, Kashiwa-no-ha, Kashiwa, Chiba 277-8581, Japan
| | - T Mochiku
- National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - T Nakane
- National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - K Hirata
- National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - S Shin
- ISSP, University of Tokyo, Kashiwa-no-ha, Kashiwa, Chiba 277-8581, Japan.,CREST JST, University of Tokyo, Kashiwa-no-ha, Kashiwa, Chiba 277-8581, Japan
| |
Collapse
|
11
|
Yano S, Mori T, Kanda Y, Kato J, Nakaseko C, Fujisawa S, Tomita N, Sakai R, Shono K, Saitoh T, Aotsuka N, Kobayashi N, Saito T, Takahashi S, Kanamori H, Okamoto S. Favorable survival after allogeneic stem cell transplantation with reduced-intensity conditioning regimens for relapsed/refractory follicular lymphoma. Bone Marrow Transplant 2015; 50:1299-305. [DOI: 10.1038/bmt.2015.158] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Revised: 05/12/2015] [Accepted: 05/26/2015] [Indexed: 11/09/2022]
|
12
|
Abstract
Macrophages play a critical role in the pathogenesis of metabolic diseases including gout and type 2 diabetes. The Nod-like receptor (NLR) family, pyrin domain containing 3 (NLRP3) forms the inflammasome with apoptosis-associated speck-like protein containing a CARD (ASC), the adaptor protein, and mediates inflammatory responses by macrophages. By compound screening, we found that tubulin polymerization inhibitors suppress NLRP3 inflammasome activation. NLRP3 inflammasome inducers reduce the NAD(+) level to inactivate the α-tubulin deacetylase Sirtuin 2, resulting in accumulation of acetylated α-tubulin. Acetylated α-tubulin mediates mitochondrial transport and subsequent proximity of ASC on mitochondria to NLRP3 on the endoplasmic reticulum. Thus, microtubule-driven transport of mitochondria is required for NLRP3 inflammasome activation. Macrophages are comprised of two subsets, M1 (inflammatory) and M2 (anti-inflammatory). Trib1 is an adaptor protein involved in protein degradation of immune-related transcription factors. We found that Trib1 is critical for the differentiation of F4/80(+) MR(+) tissue-resident M2-like macrophages. Mice lacking Trib1 in haematopoietic cells show severe lipodystrophy owing to increased lipolysis, even on a normal diet. In response to a high-fat diet, the mice show hypertriglyceridaemia and insulin resistance, together with increased proinflammatory cytokine production. Thus, Trib1 is critical for adipose tissue maintenance and suppression of metabolic disorders by controlling the differentiation of tissue-resident M2-like macrophages.
Collapse
Affiliation(s)
- S Akira
- Laboratory of Host Defense, WPI Immunology Frontier Research Center, Osaka University, Osaka, Japan.
| | | | | | | |
Collapse
|
13
|
Ohtani H, Hagita K, Ito AM, Kato T, Saitoh T, Takeda T. Irreversible data compression concepts with polynomial fitting in time-order of particle trajectory for visualization of huge particle system. ACTA ACUST UNITED AC 2013. [DOI: 10.1088/1742-6596/454/1/012078] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
14
|
Sano M, Satoh H, Suwa K, Nobuhara M, Saitoh T, Saotome M, Urushida T, Katoh H, Hayashi H. Cardiac involvement in systemic sclerosis and the value of Late Gadolinium Enhancement (LGE) in Cardiac Magnetic Resonance (CMR). Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht309.p2999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
15
|
Saitoh T, Suwa K, Takehara Y, Sano M, Nobuhara M, Saotome M, Urushida T, Katoh H, Satoh H, Hayashi H. Analyses of intra-left atrial vortex and flow dynamics from pulmonary veins to left ventricle using phase-resolved three-dimensional cine contrast Magnetic Resonance Imaging (4D-Flow MRI). Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht309.p2938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
16
|
Ishibashi Y, Zenitani J, Saitoh T. Male-biased Dispersal Causes Intersexual Differences in the Subpopulation Structure of the Gray-sided Vole. J Hered 2013; 104:718-24. [DOI: 10.1093/jhered/est034] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
17
|
Kinoshita Y, Saitoh T, Ishihara S. [Paralytic ileus]. Nihon Rinsho 2012; 70 Suppl 6:557-560. [PMID: 23156571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Affiliation(s)
- Yoshikazu Kinoshita
- Department of Gastroenterology and Hepatology, Shimane University School of Medicine
| | | | | |
Collapse
|
18
|
Kim E, Kim JS, Lee Y, Song BS, Sim BW, Kim SU, Saitoh T, Yazawa H, Nunoya T, Chang KT. Molecular cloning, characterization of porcine IZUMO1, an IgSF family member. Reprod Domest Anim 2012; 48:90-7. [PMID: 22594348 DOI: 10.1111/j.1439-0531.2012.02037.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
IZUMO1, belonging to the family of mammalian immunoglobulin proteins, has been well characterized in the mouse. Here, we describe the molecular cloning and expression analysis of porcine IZUMO1 (pIZUMO1). Partial sequence information published in the National Center for Biotechnology Information (NCBI) database was used to generate the full-length sequence for IZUMO1 using rapid amplification of cDNA ends (RACE). A search of the porcine genomic sequence in the NCBI database identified a bacterial artificial chromosome (BAC) encoding the pIZUMO1 gene. This BAC is derived from porcine chromosome 6 and is syntenic with the corresponding regions of mouse, bovine, and human genomes encoding the IZUMO gene family. This BAC was found to encode an IZUMO1 protein with a predicted amino acid sequence having high similarity with mouse and human IZUMO1. Western blot analysis of proteins from porcine tissues indicated that pIZUMO1 was specifically expressed in the sperm. Furthermore, to confirm whether pIZUMO1 forms complexes, we overexpressed pIZUMO1 in HEK293 cells. The recombinant pIZUMO1 from cell extracts was found to form complexes. Our finding suggests that pIZUMO1 forms homodimeric complex on the sperm membrane. Furthermore, an IVF inhibition assay with an antibody for the porcine IZUMO1 Ig-like domain showed that Ig-like domain effectively prevented pig sperm-egg interactions.
Collapse
Affiliation(s)
- E Kim
- College of Pharmacy, Catholic University of Daegu, Gyeongsan, Republic of Korea
| | | | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Saitoh T, Kasamatsu T, Inoue M, Mitsui T, Koiso H, Yokohama A, Handa H, Matsushima T, Tsukamoto N, Karasawa M, Ogawara H, Nojima Y, Murakami H. Interleukin-10 gene polymorphism reflects the severity of chronic immune thrombocytopenia in Japanese patients. Int J Lab Hematol 2011; 33:526-32. [PMID: 21463487 DOI: 10.1111/j.1751-553x.2011.01320.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
INTRODUCTION T-helper cell type 1 (Th1) polarization of the immune response has been documented in patients with chronic immune thrombocytopenia (ITP). Interleukin (IL)-10 is the most important factor regulating Th1 and T-helper type 2 cytokine synthesis. This study evaluated the impact of IL-10 polymorphisms on both susceptibility to, and severity of, chronic ITP. METHODS We analyzed -1082(G/A), -812(C/T), and -592(C/A) IL-10 polymorphisms in 90 patients with adult chronic ITP and 202 race- and sex-matched healthy controls. RESULTS No significant differences in the genotype or haplotype frequencies were observed between the patient with chronic ITP and the control group. However, more patients with the -592AA genotype showed a severe thrombocytopenic state (platelet count <10 x 10⁹/l) than those with the -592CC/CA genotypes (44.1%vs. 19.6%, P = 0.01). Furthermore, more patients with the ATA/ATA haplotype showed a severe thrombocytopenic state than those without the ATA/ATA haplotype (44.1%vs. 19.6%, P = 0.01). CONCLUSION According to our data, patients with low producer type of IL-10 polymorphisms have more severe thrombocytopenia, suggesting that IL-10 gene polymorphisms may reflect the severity of ITP.
Collapse
Affiliation(s)
- T Saitoh
- Department of Medicine and Clinical Science, Gunma University Graduate School of Medicine, Gunma, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Shibahara K, Takeuchi T, Saitoh T, Nishino S, Matsunami H. Inversion-Type Mos Field Effect Transistors Using CVD Grown Cubic SiC on Si. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-97-247] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTInversion-type n-channel MOSFET's of cubic-SiC were successfully fabricated. MOSFET's were fabricated on an antiphase-domains free layer grown on Si(100) by carbonization and subsequent chemical vapor deposition. Ion implantation technique was used to form source and drain of MOSFET's. A gate oxide of SiO2 was formed by thermal oxidation of SiC. Inversion mode operation was confirmed for the first time. Annealing temperature dependence of electrical characteristics of P+ and N2+ implanted layer and characteristics of p-n junction diodes fabricated using ion implantation technique were also investigated.
Collapse
|
21
|
Saitoh T, Kobayashi D, Kimura D, Asai K. In-Situ Observation of UV/Ozone Oxidation of Silicon using Spectroscopic Eli Psometry. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-569-101] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTInitial oxidation process of silicon in UV/ozone ambient has been monitored using a multi-wavelength, in-situ spectroscopic ellipsometry. Ozone gas was chemically formed by photochemical reaction of oxygen under ulUmviolet illuimination. The oxide growth was monitored for hydrogenated silicon surfaces as functions of oxygen gas flow rate, gas pressure and wafer temperature. Initial oxidation rates were very high at almost all the temperatures. The oxidation rate was 0.2 nm/min about ten times higher than that for thermal oxidation without UV light at low temperatures. The accelerated oxidation was probably due to an electric field effect on the oxidation of back-bond silicon by active oxygen atoms included in the ozone gas.
Collapse
|
22
|
Ozaki I, Baba M, Kurihara A, Saitoh T. Chronic inflammatory demyelinating polyneuropathy (CIDP) with ophthalmoplegia: a case with asymmetric limb weakness and high titers of anti-GM1 antibody. Eur J Neurol 2011. [DOI: 10.1111/j.1468-1331.1996.tb00249.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
23
|
Saitoh T, Kusunoli T, Yao T, Kawano K, Kojima Y, Miyahara K, Onoda J, Yokoi H, Ikeda K. Relationship between epithelial damage or basement membrane thickness and eosinophilic infiltration in nasal polyps with chronic rhinosinusitis. Rhinology 2009; 47:275-279. [PMID: 19839250 DOI: 10.4193/rhin08.109] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Chronic rhinosinusitis (CRS) with nasal polyps is characterized by eosinophilic infiltration. This study hypothesized that the aggregation of the mucosal pathology during remodeling is related to infiltrating eosinophils in patients with such nasal polyps. OBJECT To clarify the pathogenetic role of eosinophils in patients with CRS with nasal polyps, this study investigated the relationship between epithelial damage or basement membrane (BM) thickening and the epithelial infiltration of eosinophils in these nasal polyps. METHODS The number of eosinophils that infiltrated into the epithelial and subepithelial layers of sinonasal tissues was counted. The staging of epithelial damage allowed the quantification of epithelial loss. RESULTS Both epithelial damage and BM thickness in CRS, which were correlated with the number of infiltrated eosinophils, were significantly greater than in the control group. Neither parameter showed significant differences between the asthma and non-asthma groups. There was a significantly correlation in the eosinophilic infiltration between the subepithelial and epithelial layers. CONCLUSION It is suggested that eosinophils that infiltrate into both the epithelial and subepithelial layers play a part in the process of mucosal remodeling of CRS with nasal polyps.
Collapse
Affiliation(s)
- T Saitoh
- Department of Otorhinolaryngology, Juntendo University School of Medicine, Tokyo, Japan
| | - T Kusunoli
- Department of Otorhinolaryngology, Juntendo University School of Medicine, Tokyo, Japan
| | | | | | - Y Kojima
- Division of Biomedical Imaging Research Center, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - K Miyahara
- Division of Biomedical Imaging Research Center, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - J Onoda
- Department of Otorhinolaryngology, Juntendo University School of Medicine, Tokyo, Japan
| | | | | |
Collapse
|
24
|
Saitoh T. Relationship between epithelial damage or basement membrane thickness and eosinophilic infiltration in nasal polyps with chronic rhinosinusitis. Rhinology 2009. [DOI: 10.4193/rhin08.190] [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: 11/08/2022]
|
25
|
Saitoh T, Kusunoki T, Yao T, Kawano K, Kojima Y, Miyahara K, Onoda J, Yokoi H, Ikeda K. Role of interleukin-17A in the eosinophil accumulation and mucosal remodeling in chronic rhinosinusitis with nasal polyps associated with asthma. Int Arch Allergy Immunol 2009; 151:8-16. [PMID: 19672092 DOI: 10.1159/000232566] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Accepted: 03/27/2009] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Interleukin (IL)-17A is a highly inflammatory cytokine with a robust effect on stromal cells in many tissues. Although IL-17A is known to be associated with inflammatory lung disorders by triggering an accumulation of neutrophils, the effect of IL-17A on the upper airway is still uncertain. The expression of IL-17A and its role were investigated in the nasal polyps of chronic rhinosinusitis associated with asthma. METHODS IL-17A was detected by immunohistochemistry and quantitative real-time RT-PCR. The cellular source of IL-17A was examined by double staining with EG2, CD4 and neutrophil elastase. The tissue remodeling of the nasal polyps was evaluated by assessing the epithelial damage and basement membrane thickness. RESULTS Both the immunoreactivity and mRNA of IL-17A were significantly detected in the nasal polyps in comparison with control normal sinus mucosa. The localization of IL-17A expression predominantly coincided with eosinophils and CD4-positive lymphocytes. Furthermore, the number of IL-17A-positive cells correlated with tissue eosinophils, but not with neutrophils. The degree of epithelial damage and basement membrane thickness was dependent on the number of infiltrated IL-17A-positive cells. CONCLUSION The present study suggests, for the first time, that IL-17A plays an important role in the eosinophil accumulation in the nasal polyps and the remodeling of the nasal polyps of chronic rhinosinusitis associated with asthma.
Collapse
Affiliation(s)
- T Saitoh
- Department of Otorhinolaryngology, Juntendo University School of Medicine, Bunkyo-ku, Tokyo, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Iwasawa H, Douglas JF, Sato K, Masui T, Yoshida Y, Sun Z, Eisaki H, Bando H, Ino A, Arita M, Shimada K, Namatame H, Taniguchi M, Tajima S, Uchida S, Saitoh T, Dessau DS, Aiura Y. Isotopic fingerprint of electron-phonon coupling in high-Tc cuprates. Phys Rev Lett 2008; 101:157005. [PMID: 18999630 DOI: 10.1103/physrevlett.101.157005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2008] [Indexed: 05/27/2023]
Abstract
Angle-resolved photoemission spectroscopy with low-energy tunable photons along the nodal direction of oxygen isotope substituted Bi(2)Sr(2)CaCu(2)O(8+delta) reveals a distinct oxygen isotope shift near the electron-boson coupling "kink" in the electronic dispersion. The magnitude (a few meV) and direction of the kink shift are as expected due to the measured isotopic shift of phonon frequency, and are also in agreement with theoretical expectations. This demonstrates the participation of the phonons as dominant players, as well as pinpointing the most relevant of the phonon branches.
Collapse
Affiliation(s)
- H Iwasawa
- Department of Applied Physics, Tokyo University of Science, Shinjuku-ku, Tokyo 162-8601, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
27
|
Kogure M, Kashimura S, Matsuyama S, Ohtani S, Saze Z, Odashima Y, Saitoh T, Soeta N, Osuka F, Hoshino Y, Saito T, Terashima S, Terashima M, Gotoh M. Prognostic role of immunosuppressive acidic protein in patients with esophageal cancer. Dis Esophagus 2008; 21:214-9. [PMID: 18430101 DOI: 10.1111/j.1442-2050.2007.00754.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Immunosuppressive acidic protein (IAP) suppresses several immune responses in vivo and in vitro , and high preoperative IAP levels could predict the impairment of the host's immunity. In this study prognostic significance of preoperative IAP levels was investigated in 68 esophageal cancer patients with curative resection and eight with non-curative resection. The curative group had significantly lower levels than the non-curative group (432 +/- 183 mg/mL vs. 739 +/- 235 mg/mL, P < 0.0001). The IAP levels were associated with T-status (P < 0.0001), lymphatic invasion (P < 0.05), and p-stages (P < 0.0001). When 5-year survival rate of patients with curative resection was compared by setting various cutoff values of IAP between high and low IAP groups, several cutoff points (400-580 mg/mL) were revealed to be significantly associated with survival. Setting cutoff value of IAP to 560 mg/mL resulted in a most significant difference of 5-year survival rate of patients between the high and low IAP groups (13.9% and 61.5%, P < 0.0001). These data indicate that pre-operative IAP level is a useful parameter to predict the prognosis of esophageal cancer patients after curative resection.
Collapse
Affiliation(s)
- M Kogure
- Department of Surgery 1, Fukushima Medical University, Fukushima, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
28
|
|
29
|
Kimata-Ariga Y, Saitoh T, Ikegami T, Horii T, Hase T. Molecular Interaction of Ferredoxin and Ferredoxin-NADP+ Reductase from Human Malaria Parasite. J Biochem 2007; 142:715-20. [DOI: 10.1093/jb/mvm184] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
30
|
Shimojima T, Shibata Y, Ishizaka K, Kiss T, Chainani A, Yokoya T, Togashi T, Wang XY, Chen CT, Watanabe S, Yamaura J, Yonezawa S, Muraoka Y, Hiroi Z, Saitoh T, Shin S. Interplay of superconductivity and rattling phenomena in beta-pyrochlore KOs2O6 studied by photoemission spectroscopy. Phys Rev Lett 2007; 99:117003. [PMID: 17930463 DOI: 10.1103/physrevlett.99.117003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2006] [Indexed: 05/25/2023]
Abstract
The electronic structure near the Fermi level (EF) of the beta-pyrochlore superconductor KOs2O6 is studied using laser-excited ultrahigh-resolution photoemission spectroscopy. The superconducting gap clearly opens across the superconducting transition (Tc=9.6 K), with the strong electron-phonon coupling value of 2Delta(0)/k B Tc>or=4.56. A fitting analysis identifies clear anomalies at Tp=7.5 K in the temperature dependencies of the superconducting gap size and the quasiparticle relaxation lifetime. These anomalies and the fine spectral structures arising from phonons suggest that the existence of the rattling behavior of K ions significantly affects the superconductivity in KOs2O6.
Collapse
Affiliation(s)
- T Shimojima
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Pen B, Iwama T, Ooi M, Saitoh T, Kida K, Iketaki T, Takahashi J, Hidari H. Effect of Potato By-products Based Silage on Rumen Fermentation, Methane Production and Nitrogen Utilization in Holstein Steers. Asian Australas J Anim Sci 2006. [DOI: 10.5713/ajas.2006.1283] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
32
|
Abstract
A multi-point, implicit-type, finite-difference method for solving the bubble growth (or collapse) problem in an ultraheated liquid is proposed. The method is applicable to both inertia-controlled growth and heat-diffusion-controlled growth. The results are compared with several asymptotic solutions, involving Plesset-Zwick and Mikic-Rohsenow-Griffith solutions. Present results strongly support the Mikic-Rohsenow-Griffith solution for the wide range of bubble growth conditions, e.g. given fluids, pressure, liquid ultraheat, etc.
Collapse
Affiliation(s)
- T. Saitoh
- Assistant Professor, Department of Mechanical Engineering, Tohoku University, Sendai, Japan
| | - A. Shima
- Professor, Institute of High Speed Mechanics, Tohoku University, Sendai, Japan
| |
Collapse
|
33
|
Iwasawa H, Yamakawa K, Saitoh T, Inaba J, Katsufuji T, Higashiguchi M, Shimada K, Namatame H, Taniguchi M. Electronic structure of charge- and spin-controlled Sr(1-(x+y))La(x+y)Ti(1-x)Cr(x)O3. Phys Rev Lett 2006; 96:067203. [PMID: 16606039 DOI: 10.1103/physrevlett.96.067203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2005] [Indexed: 05/08/2023]
Abstract
We present the electronic structure of Sr(1-(x+y))La(x+y)Ti(1-x)Cr(x)O3 investigated by high-resolution photoemission spectroscopy. In the vicinity of the Fermi level, it was found that the electronic structure was composed of a Cr 3d local state with the t(2g)3 configuration and a Ti 3d itinerant state. The energy levels of these Cr and Ti 3d states are well interpreted by the difference of the charge-transfer energy of both ions. The spectral weight of the Cr 3d state is completely proportional to the spin concentration x irrespective of the carrier concentration y, indicating that the spin density can be controlled by x as desired. In contrast, the spectral weight of the Ti 3d state is not proportional to y, depending on the amount of Cr doping.
Collapse
Affiliation(s)
- H Iwasawa
- Department of Applied Physics, Tokyo University of Science, Shinjuku-ku, Tokyo 162-8601, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
34
|
Kitoh Y, Tsuruoka S, Ohmori M, Sugimoto K, Saitoh T, Fujimura A. Changes of neutrophil function during the interdialytic period. Clin Nephrol 2006; 65:75-7. [PMID: 16429848 DOI: 10.5414/cnp65075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
|
35
|
Hitosugi T, Shimizu T, Suzuki S, Kubota I, Shoda E, Saitoh T, Oi Y. Crit Care 2006; 10:P172. [DOI: 10.1186/cc4519] [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: 11/10/2022] Open
|
36
|
Hatta Y, Takeuchi J, Saitoh T, Itoh T, Ishizuka H, Iriyama N, Miyajima T, Kaneita Y, Saiki M, Yasukawa K, Yasukawa R, Kura Y, Nishinarita S, Sawada U, Horie T. WT1 expression level and clinical factors in multiple myeloma. J Exp Clin Cancer Res 2005; 24:595-9. [PMID: 16471322] [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: 05/06/2023]
Abstract
Although Wilm's Tuomor gene (WT1) was first identified as a tumor suppressor gene for Wilm's tumor, WT1 overexpression has been detected in different malignant cell types including leukemia. Increased expression of WT1 in acute leukemia is potentially used as a marker of minimal residual disease. However, the significance of the gene for multiple myeloma is still not clear. To determine the clinical relevance of WT1 expression in multiple myeloma, we examined the association of clinical parameters and WT1 expression in bone marrow for 17 newly diagnosed multiple myeloma patients. WT1 was assessed by real-time quantitative polymerase chain reaction (RQ-PCR) and calculated standardized WT1 expression level per 100 plasma cells in the bone marrow specimen as "corrected WT1". The expression of standardized WT1 and corrected WT1 in myeloma was 59 to 1,600 copies/microg RNA and 0.05 to 406.3 copies/microg RNA/100 plasma cells, respectively, lower than in leukemia. WT1 transcripts increased when clinical factors worsen, including the stage, amount of M protein, Hb, platelet count, blood urea nitrogen (BUN), creatinine, serum alkaline phosphatase (ALP), calcium, beta2-microglobulin, thymidine kinase activity (TK), and C-reactive protein (CRP). In conclusion, the expression level of WT1 could be an additional marker to the standard parameters considered in risk assessment for multiple myeloma.
Collapse
Affiliation(s)
- Y Hatta
- Dept. of Hematology and Rheumatology, Nihon University School of Medicine, Tokyo, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Saitoh T, Toyota H, Nakayama M, Ikegami T, Kurisu G, Kusunoki M, Hase T. Structural analysis of the interaction between plant sulfite reductase and ferredoxin. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305091026] [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: 11/10/2022] Open
|
38
|
Abstract
Gefitinib, a selective epidermal growth factor receptor tyrosine kinase inhibitor, is an effective treatment for patients with non-small cell lung cancer (NSCLC). Some investigators have recently reported several patients complicated by acute lung injury after the initiation of gefitinib administration. In this report, we investigated the efficacy and adverse events during treatment with gefitinib. The subjects of this study were all of the 110 patients with NSCLC who were treated in our hospital and its eight branch hospitals. Patients received gefitinib at a dose of 250 mg once daily. The response rate was 30%. The frequently reported adverse events were skin disorders, gastrointestinal disturbances, liver dysfunction and acute lung injury. Five of the 12 patients who were considered to have suffered acute lung injury died of progressive respiratory failure. Of the nine patients who had pulmonary fibrosis before use of gefitinib, five developed acute lung injury during the treatment. Sera from three of the 12 patients were evaluated and all three showed increases of surfactant protein (SP)-A, SP-D and KL-6. We conclude that gefitinib was clinically useful. However, several patients suffered acute lung injury which could have been caused by gefitinib. A detection system including SP-A, SP-D and KL-6 as prime candidates as markers should be established as promptly as possible. Clinicians should be aware that treatment of NSCLC with gefitinib involves the risk of acute lung injury and therefore careful consideration should be given before deciding whether or not gefitinib is indicated for treatment. Further study is necessary to elucidate the mechanism of acute lung injury by gefitinib.
Collapse
Affiliation(s)
- Shin-ichiro Inomata
- Third Department of Internal Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|
39
|
Tawara T, Gotoh H, Akasaka T, Kobayashi N, Saitoh T. Cavity polaritons in InGaN microcavities at room temperature. Phys Rev Lett 2004; 92:256402. [PMID: 15245040 DOI: 10.1103/physrevlett.92.256402] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2003] [Indexed: 05/24/2023]
Abstract
Cavity polaritons are observed in InGaN quantum well (QW) microcavities at room temperature. High-quality microcavities are fabricated by the wafer-bonding of InGaN QW layers and dielectric distributed Bragg reflectors. The anticrossing behavior of strong exciton-photon coupling is confirmed by vacuum-field Rabi splitting obtained from reflection measurements. This strong coupling is also enhanced by increasing the integrated oscillator strength coupled to the cavity mode. The oscillator strength of InGaN QW excitons is 1 order of magnitude larger than that of GaAs QW excitons.
Collapse
Affiliation(s)
- T Tawara
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan.
| | | | | | | | | |
Collapse
|
40
|
Kawate N, Itami T, Choushi T, Saitoh T, Wada T, Matsuoka K, Uenaka K, Tanaka N, Yamanaka A, Sakase M, Tamada H, Inaba T, Sawada T. Improved conception in timed-artificial insemination using a progesterone-releasing intravaginal device and Ovsynch protocol in postpartum suckled Japanese Black beef cows. Theriogenology 2004; 61:399-406. [PMID: 14662139 DOI: 10.1016/s0093-691x(03)00239-5] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The primary objective was to determine the effect of supplemental progesterone, administered via an intravaginal device (CIDR), on conception rates to timed-artificial insemination (timed-AI) in postpartum suckled Japanese Black beef cows treated with the Ovsynch protocol. A secondary objective was to compare the effects of treatments on plasma concentrations of progesterone and estradiol. Cows in the control group (Ovsynch, n=38) received a standard Ovsynch protocol (100 microg GnRH analogue on Day 0, 500 microg PGF2alpha analogue on Day 7, and 100 microg GnRH analogue on Day 9), with AI on Day 10, approximately 20 h after the second GnRH treatment. Cows in the treatment group (Ovsynch+CIDR; n=40) received a standard Ovsynch protocol plus a CIDR for 7 days (starting on Day 0). Plasma progesterone concentrations were determined on Days 0, 1, 7, 9, 10, and 17 and plasma estradiol-17beta concentrations were determined on Days 7, 9, 10, and 17. The odds ratio for likelihood of conception was 3.29 times greater (P=0.02) in the Ovsynch+CIDR group compared to Ovsynch group. The conception rate was greater (P=0.03) in the Ovsynch+CIDR group than in the Ovsynch group (72.5% versus 47.7%). Insertion of a CIDR device significantly increased plasma progesterone concentrations only on Days 1 and 7 (P<0.001 and P=0.05, respectively), but had no significant effect on plasma estradiol-17beta concentrations. Including a CIDR with the Ovsynch protocol significantly improved conception rates in postpartum suckled Japanese Black beef cows.
Collapse
Affiliation(s)
- N Kawate
- Laboratory of Theriogenology, Graduate School of Agriculture and Biological Sciences, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
41
|
Saitoh T. Concentration of heavy metal ions in water using thermoresponsive chelating polymer. Talanta 2003; 61:811-7. [DOI: 10.1016/s0039-9140(03)00379-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2003] [Revised: 06/02/2003] [Accepted: 06/02/2003] [Indexed: 11/30/2022]
|
42
|
Kakinohana M, Motonaga E, Saitoh T, Taira Y, Okuda Y. Propofol suppressed electromyographic fibrillation potentials in a patient with amyotrophic lateral sclerosis. J Anesth 2003; 13:122-4. [PMID: 14530954 DOI: 10.1007/s005400050040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- M Kakinohana
- Department of Anesthesiology, Okinawa Prefectural Miyako Hospital, Hirara-city, Japan
| | | | | | | | | |
Collapse
|
43
|
Kobayashi K, Saitoh T, Shah DSH, Ohnishi K, Goodfellow IG, Sockett RE, Aizawa SI. Purification and characterization of the flagellar basal body of Rhodobacter sphaeroides. J Bacteriol 2003; 185:5295-300. [PMID: 12923105 PMCID: PMC181020 DOI: 10.1128/jb.185.17.5295-5300.2003] [Citation(s) in RCA: 22] [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: 11/20/2022] Open
Abstract
Flagellar hook-basal body (HBB) complexes were purified from Rhodobacter sphaeroides. The HBB was more acid labile but more heat stable than that of Salmonella species, and protein identification revealed that HBB components were expressed only from one of the two sets of flagellar gene clusters on the R. sphaeroides genome, under the heterotrophic growth conditions tested here.
Collapse
Affiliation(s)
- K Kobayashi
- Department of Biosciences, Teikyo University, 1-1 Toyosatodai, Utsunomiya 320-8551, Japan
| | | | | | | | | | | | | |
Collapse
|
44
|
Sano T, Konishi H, Ohki S, Saitoh T, Kamisawa O, Katoh M, Misawa Y, Fuse K. [Sinus of Valsalva dilatation after replacement of the ascending aorta and aortic valve]. Kyobu Geka 2003; 56:786-9. [PMID: 12931591] [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: 03/04/2023]
Abstract
A 52-year-old woman, height, 149 cm; weight, 40 kg, was admitted because of anterior chest discomfort and palpitations. There was no family history of Marfan syndrome. She had undergone replacement of the ascending aorta and aortic valve 10 years prior for DeBakey II aortic dissection. Postoperative pathological examination of the resected aortic wall revealed cystic medionecrosis. Computed tomography(CT) 4 years after the surgery showed moderate enlargement of the preserved sinuses of Valsalva, and CT 10 years after the surgery showed enlargement of the sinus. She consented to a reoperation. The prostheses were explanted, and the aortic root was replaced with a composite graft. The right coronary artery ostium was completely closed, and no graftable portions of the distal right coronary artery were detected. Thus, the left coronary artery alone was reimplanted. The patient required extracorporeal membrane oxygenation for 10 days postoperatively, after which she recovered fully without complications. This case may indicate that the complete aortic root should be replaced during initial surgery of the ascending aorta or aortic valve in patients with potential risk of sinus of Valsalva dilatation.
Collapse
Affiliation(s)
- T Sano
- Division of Cardiovascular Surgery, Department of Surgery, Jichi Medical School, Tochigi, Japan
| | | | | | | | | | | | | | | |
Collapse
|
45
|
Saitoh T, Watanabe Y, Kubo Y, Shinagawa M, Otsuka K, Ohkawa SI, Watanabe T. Effect of H2 blockers on the circadian rhythm of intragastric acidity. Biomed Pharmacother 2003; 56 Suppl 2:349s-352s. [PMID: 12653192 DOI: 10.1016/s0753-3322(02)00315-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Most patients with peptic ulcer or gastro-oesophageal reflux disease develop nocturnal pain (epigastric and retrosternal pain from midnight to early morning), which often disappears before breakfast. Such pain may be related to a disturbance of the circadian rhythm of gastric acid secretion. Helicobacter pylori is a known aetiological agent of peptic ulcer disease and patients with gastritis or ulcers now undergo infection eradication therapy. However, this can result in the onset or exacerbation of gastro-oesophageal reflux disease. There has been a marked increase in the number of patients with oesophagitis rather than peptic ulcer and because most are negative for H. pylori, attention has centred on the status of their gastric acid secretion. Some patients with oesophagitis complain of nocturnal pain despite treatment with a proton pump inhibitor, and in those cases a short course of an H2 blocker can be very effective. We used a portable pH meter to study, in a cross-over fashion, the changes in the circadian rhythm of gastric acid secretion caused by two H2 blockers, laftidine and famotidine, in 10 H. pylori-negative subjects. There was a significant difference in the rhythm between baseline (no treatment) and when laftidine or famotidine were administered, with mean values for amplitude of 28.1, 13.80 and 10.82, respectively; for the midline estimating statistic of rhythm (MESOR), 22.7, 10.80, and 11.54; and for acrophase, 324.0. 312.3, and 274.5 (p < 0.001). The H2 blockers suppressed the normal circadian rhythm of intragastric acidity, which rises in the evening until the middle of the night and then drops in the morning.
Collapse
Affiliation(s)
- T Saitoh
- Department of Internal Medicine, Tokyo Women's Medical University, School of Medicine, Daini Hospital, Tokyo, Japan.
| | | | | | | | | | | | | |
Collapse
|
46
|
Haydon DT, Greenwood PE, Stenseth NC, Saitoh T. Spatio-temporal dynamics of the grey-sided vole in Hokkaido: identifying coupling using state-based Markov-chain modelling. Proc Biol Sci 2003; 270:435-45. [PMID: 12639324 PMCID: PMC1691250 DOI: 10.1098/rspb.2002.2230] [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: 01/17/2023] Open
Abstract
Explaining synchronization of cyclical or fluctuating populations over geographical regions presents ecologists with novel analytical challenges. We have developed a method to measure synchrony within spatial-temporal datasets of population densities applicable to both periodic and irregularly fluctuating populations. The dynamics of each constituent population is represented by a discrete Markov model. The state of a population trajectory at each time-point is classified as one of 'increase', 'decrease', 'peak' or 'trough'. The set of populations at any time-point is characterized by the frequency distribution of these different states, and the time-evolution of this frequency distribution used to test the hypothesis that the dynamics of each population proceeds independently of the others. The analysis identifies years in which population coupling results in synchronous states and onto which states the system converges, and identifies those years in which synchrony remains high but is accounted for by coupling observed in previous years. It also enables identification of which pairs of sites show the highest levels of coupling. Applying these methods to populations of the grey-sided vole on Hokkaido reveals them to be fluctuating in greater synchrony than would be expected from independent dynamics, and that this level of synchrony is maintained through intermittent coupling acting in ca. 1 year in four or five. High synchrony occurs between sites with similar vegetation and of similar altitude indicating that coupling may be mediated through shared environmental stimuli. When coupling is indicated, convergence is equally likely to occur on a peak state as a trough, indicating that synchronization may be brought about by the response of populations to a combination of different stimuli rather than by the action of any single process.
Collapse
Affiliation(s)
- D T Haydon
- Department of Zoology, University of Guelph, Ontario N1G 2W1, Canada.
| | | | | | | |
Collapse
|
47
|
Saitoh T, Fukushima Y, Otsuka H, Hirakawa J, Mori H, Asano T, Ishikawa T, Katsube T, Ogawa K, Ohkawa S. Effects of rabeprazole, lansoprazole and omeprazole on intragastric pH in CYP2C19 extensive metabolizers. Aliment Pharmacol Ther 2002; 16:1811-7. [PMID: 12269976 DOI: 10.1046/j.1365-2036.2002.01348.x] [Citation(s) in RCA: 54] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
AIM To investigate the inhibitory effects on gastric acid secretion of three proton pump inhibitors, omeprazole, lansoprazole and rabeprazole, using a three-way crossover design in healthy Helicobacter pylori-negative,S-mephenytoin 4'-hydroxylase (CYP2C19) homo- and hetero-extensive metabolizers. METHODS Eight healthy Japanese male volunteers were enrolled. After the administration of rabeprazole (10 mg/day), lansoprazole (30 mg/day) or omeprazole (20 mg/day), intragastric pH monitoring was commenced from 24 h before the first proton pump inhibitor dose, and continued for days 1-3 after proton pump inhibitor administration. The pH electrode was used for 48 h and changed just before pH monitoring on day 2. RESULTS For the administration of 10 mg/day rabeprazole, the mean ratios of the 24-h pH > or = 3 holding time were 5.7 +/- 1.1%,13.6 +/- 2.2%, 35.3 +/- 2.7% and 62.8 +/- 3.1% for the pre-treatment day and days 1, 2 and 3, respectively. The same ratios for lansoprazole (30 mg/day) were 5.7 +/- 0.7%, 7.4 +/- 1.5%, 13.6 +/- 3.4% and 26.6 +/- 4.9%; the same ratios for 20 mg/day omeprazole were 5.9 +/- 0.9%, 6.1 +/- 1.2%, 11.4 +/- 2.8% and 16.4 +/- 4.6%. The mean ratio of the 24-h pH > or = 3 holding time of days 1-3 increased significantly compared to the pre-treatment day (P < 0.01) with the administration of rabeprazole and lansoprazole. The magnitude of inhibition of gastric acid secretion after rabeprazole administration was stronger than that after lansoprazole. A significant elevation of the mean ratio of the 24-h pH > or = 3 holding time was demonstrated on days 2 and 3 with omeprazole (P < 0.01). CONCLUSIONS In H. pylori-negative CYP2C19 extensive metabolizers, rabeprazole (10 mg/day) shows a faster onset of rising intragastric pH and a stronger inhibition of gastric acid secretion than do lansoprazole (30 mg/day) or omeprazole (20 mg/day).
Collapse
Affiliation(s)
- T Saitoh
- Department of Internal Medicine, Tokyo Women's Medical University, Daini Hospital, Japan.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
48
|
Abstract
Most patients with peptic ulcers or gastroesophageal reflex disease develop subjective symptoms of epigastralgia and retrosternal pain during the period of time from the middle of the night to the early dawn (nocturnal pain). Such pain often disappears before breakfast. Disturbed circadian rhythm of gastric acid secretion may have a close relationship with the onset and aggravation of acid-related diseases. On the other hand, Helicobacter pylori has been considered to be an etiological agent of duodenal ulcer, and H. pylori eradication has been conducted in patients with gastritis and peptic ulcers. However, such eradication therapy sometimes results in the onset or deterioration of gastroesophageal reflux diseases. In this context, the question of whether the circadian rhythm of gastric acid secretion varies in accordance with the presence or absence of H. pylori infection is of interest. In the present study, we examined the fluctuation in intragastric acidity via a portable pH meter in 10 H. pylori-positive and 10 H. pylori-negative subjects. As a result, a significant difference in the circadian rhythmicity was observed between the H. pylori-negative and the H. pylori-positive group, with mean values for each parameter of 28.1 and 13.3 for amplitude, 22.7 and 12.4 for the midline-estimating statistic of rhythm (MESOR), and 324.0 and 321.0 for acrophase, respectively (P < 0.001). In both H. pylori-positive and negative groups, a tendency was observed toward an increase in intragastric acidity during the time period from the middle of the night to the early dawn, and toward a decrease in intragastric acidity during the early morning. In the H. pylori-positive group, the values for intragastric acidity over time were lower, and the degree of amplitude was smaller as compared to the H. pylori-negative group. Further, H. pylori-positive individuals were at a more advanced stage of the disease.
Collapse
Affiliation(s)
- T Saitoh
- Department of Internal Medicine, Tokyo Women's Medical University, School of Medicine, Daini Hospital, Japan.
| | | | | | | | | | | | | |
Collapse
|
49
|
Saitoh T, Fukushima Y, Otsuka H, Ishikawa M, Tamai M, Takahashi H, Mori H, Asano T, Anai M, Ishikawa T, Katsube T, Ogawa K, Kajiwara T, Omata M, Ohkawa S. Effects of N-alpha-methyl-histamine on human H(2) receptors expressed in CHO cells. Gut 2002; 50:786-9. [PMID: 12010879 PMCID: PMC1773239 DOI: 10.1136/gut.50.6.786] [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] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
Abstract
BACKGROUND Production of N-alpha-methyl-histamine (NAMH), a histamine H(3) receptor (H3R) agonist, is reportedly promoted in Helicobacter pylori infected human gastric mucosa. NAMH was suggested to act directly on histamine H(2) receptors (H2Rs) in animals to stimulate acid secretion and to be a H2R agonist. As H2Rs and H3Rs play different roles in gastric acid secretion, it is very important to verify that NAMH is a H2R agonist. AIMS To determine whether NAMH is a H2R agonist, as well as a H3R agonist. METHODS We used a Chinese hamster ovary (CHO) cell line expressing human H2Rs (CHO-H2R) and control CHO cells. Expression of human H2Rs was confirmed by tiotidine binding. cAMP production in CHO-H2R and control cells in response to histamine or NAMH was measured. cAMP production in response to 10(-7) M NAMH was also measured in the presence or absence of the H2R antagonist famotidine and the H3R antagonist thioperamide. RESULTS NAMH dose dependently stimulated cAMP productions in CHO-H2R cells. This production was inhibited by famotidine but not by thioperamide. Control CHO cells were unresponsive to either histamine or NAMH. In addition, the effect of NAMH, in terms of cAMP production in CHO-H2R cells, was more potent than that of histamine-that is, with a lower EC(50) concentration and higher maximal cAMP production. Both NAMH and histamine, but not R-alpha-methyl-histamine, effectively inhibited [(3)H] tiotidine binding to CHO-H2R cells. CONCLUSIONS NAMH, which is produced in the gastric mucosa by H pylori, is a potent H2R agonist as well as a H3R agonist.
Collapse
Affiliation(s)
- T Saitoh
- Department of Internal Medicine, Tokyo Women's Medical University Daini Hospital, 2-1-10 Nishiogu, Arakawa-ku, Tokyo 116-8567, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
50
|
Fukushima Y, Saitoh T, Anai M, Tsukuda K, Onishi Y, Sakoda H, Inukai K, Ogihara T, Funaki M, Ono H, Fujishiro M, Ishikawa T, Nagai R, Omata M, Asano T. G649, an allelic variant of the human H2 receptor with low basal activity, is resistant to upregulation upon antagonist exposure. Pharmacogenomics J 2002; 1:78-83. [PMID: 11913732 DOI: 10.1038/sj.tpj.6500011] [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] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Orange et al reported an allelic variant of the human histamine H2 receptor, in which adenine 649 was replaced with guanine, to be more frequent in the schizophrenic population than controls in British Caucasians. The A649 to G change causes an Asn to Asp transition at amino acid position 217 in the third intracellular region, which is postulated to be important for receptor function. Herein, we analyzed the functional significance of this variant using wild-type and variant receptors expressed in Chinese hamster ovary cells. The variant receptor was associated with markedly lower basal cAMP productions than the wild-type receptor. Histamine-dependent cAMP productions via the variant receptor were lower as well. Treatment of cells expressing variant receptors with 10(-5) M ranitidine for 24 h resulted in a reduced degree of receptor upregulation as compared with the wild-type receptor. Thus, this is the first report of an allelic variant of the human H2 receptor which confers altered receptor function. To analyze gastric acid secretion in individuals with this variant, we examined 100 Japanese control subjects. However, neither heterozygotes nor homozygotes were found, suggesting that this variant, if present, is uncommon in the Japanese population.
Collapse
Affiliation(s)
- Y Fukushima
- Department of Internal Medicine, Faculty of Medicine, University of Tokyo, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|