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Asai D, Osone S, Imamura T, Sakaguchi H, Nishio N, Kuroda H, Kojima S, Hosoi H. Response to the article by Linnankivi et al., entitled 'Cerebroretinal microangiopathy with calcifications and cyst, Revesz syndrome and aplastic anemia'. Bone Marrow Transplant 2012; 48:154. [PMID: 22705803 DOI: 10.1038/bmt.2012.108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Tsuruda T, Hatakeyama K, Nagamachi S, Sekita Y, Sakamoto S, Endo GJ, Nishimura M, Matsuyama M, Yoshimura K, Sato Y, Onitsuka T, Imamura T, Asada Y, Kitamura K. Inhibition of development of abdominal aortic aneurysm by glycolysis restriction. Arterioscler Thromb Vasc Biol 2012; 32:1410-7. [PMID: 22499992 DOI: 10.1161/atvbaha.111.237065] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE The mechanisms underlying abdominal aortic aneurysm development remain unknown. We hypothesized that acceleration of glucose metabolism with the upregulation of glucose transporters is associated with abdominal aortic aneurysm development. METHODS AND RESULTS Enhanced accumulation of the modified glucose analogue 18 fluoro-deoxyglucose by positron emission tomography imaging in the human abdominal aortic aneurysm was associated with protein expressions of glucose transporters-1 and -3, assessed by Western blot. The magnitude of glucose transporter-3 expression was correlated with zymographic matrix metalloproteinase-9 activity. Intraperitoneal administration of glycolysis inhibitor with 2-deoxyglucose significantly attenuated the dilatation of abdominal aorta induced by periaortic application of CaCl(2) in C57BL/6J male mice or reduced the aneurysmal formation in angiotensin II-infused apolipoprotein E knockout male mice. In monocytic cell line induced by phorbol 12-myristate 13-acetate or ex vivo culture obtained from human aneurysmal tissues, 2-deoxyglucose abrogated the matrix metalloproteinase-9 activity and interleukin-6 expression in these cells/tissues. Moreover, 2-deoxyglucose attenuated the survival/proliferation of monocytes and the adherence of them to vascular endothelial cells. CONCLUSIONS This study suggests that the enhanced glycolytic activity in aortic wall contributes to the pathogenesis of aneurysm development. In addition, pharmacological intervention in glycolytic activity might be a potential therapeutic target for the disorder.
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Maki H, Hatano M, Yao A, Imamura T, Asada K, Inaba T, Shiga T, Kinugawa K, Nagai R. 615 Efficacy of Imatinib Mesylate on Scleroderma Associated Pulmonary Arterial Hypertension. J Heart Lung Transplant 2012. [DOI: 10.1016/j.healun.2012.01.629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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Kawano S, Kato J, Kawano N, Yoshimura Y, Masuyama H, Fukunaga T, Shimao Y, Mihara K, Ueda A, Toyoda K, Imamura T, Kitamura K. Sarcoidosis manifesting as cardiac sarcoidosis and massive splenomegaly. Intern Med 2012; 51:65-9. [PMID: 22214625 DOI: 10.2169/internalmedicine.51.5247] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Sarcoidosis is a multisystemic granulomatous disease of unknown etiology. We report an unusual case of sarcoidosis in a woman presenting with cardiac sarcoidosis and massive splenomegaly with a familial history of cardiac sarcoidosis. Cardiac sarcoidosis was diagnosed based on electrocardiogram, echocardiogram, 18F-fluoro-2-deoxyglucose positron emission tomography (18F-FDG-PET) and skin histological findings. We performed splenectomy to rule out malignant lymphoma, and histological findings confirmed sarcoidosis. After splenectomy, we initiated prednisolone therapy. After 20 months of diagnosis, she was symptom free. Echocardiography and 18F-FDG-PET may be a key diagnostic tool and prednisolone therapy may be safe, effective, and feasible for cardiac sarcoidosis.
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Ito I, Nishida M, Morioka S, Nozaki T, Imamura T, Morimoto A, Akioka S, Sugimoto T, Hamaoka K, Hosoi H. A case of steroid-resistant nephrotic syndrome associated with systemic lupus erythematosus. Lupus 2011; 23:703-6. [DOI: 10.1177/0961203311432740] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2011] [Accepted: 11/10/2011] [Indexed: 11/16/2022]
Abstract
We report on an 11-year-old girl who developed steroid-resistant nephrotic syndrome (NS) at the onset of systemic lupus erythematosus (SLE), and clinical and renal histological findings suggested that her NS would be associated with SLE-related podocytopathy. Although initial treatment with intravenous pulse methylprednisolone was ineffective, following treatment with cyclosporine and an angiotensin receptor blocker was effective for her nephrotic proteinuria. She had developed posterior reversible encephalopathy syndrome (PRES), and mycophenolate mofetil (MMF) was started instead of cyclosporine. At present, 45 months after the onset, she is in remission of both NS and SLE. This case indicates that NS associated with SLE-related podocytopathy should be included in the spectrum of glomerulopathy accompanying SLE, also in the pediatric population.
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Ikeda T, Kamo N, Shiga C, Sasajima Y, Imamura T. 5164 POSTER Phase II Study of Neoadjuvant S-1 Combined With Paclitaxel Followed by FEC in Patients With Breast Cancer. Eur J Cancer 2011. [DOI: 10.1016/s0959-8049(11)71606-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Hiramatsu R, Hoshino J, Imamura T, Hasegawa E, Yamanouchi M, Hayami N, Sumida K, Sawa N, Suwabe T, Ubara Y, Takaichi K. Acute obstructive suppurative cholangitis as a cause of acute kidney injury and rhabdomyolysis. Intern Med J 2011; 41:506-9. [DOI: 10.1111/j.1445-5994.2011.02509.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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108
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Li Z, Yamada S, Inenaga S, Imamura T, Wu Y, Wang KY, Shimajiri S, Nakano R, Izumi H, Kohno K, Sasaguri Y. Polypeptide N-acetylgalactosaminyltransferase 6 expression in pancreatic cancer is an independent prognostic factor indicating better overall survival. Br J Cancer 2011; 104:1882-9. [PMID: 21587259 PMCID: PMC3111199 DOI: 10.1038/bjc.2011.166] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2011] [Revised: 04/14/2011] [Accepted: 04/17/2011] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND The family of polypeptide N-acetylgalactosaminyltransferases (GalNAc-Ts) is responsible for the altered glycosylation in cancer. The purpose of our study was to investigate the clinical significance of two isoforms, GalNAc-T6 and -T3, and their correlation with the prognosis of pancreatic cancer. METHODS Immunohistochemistry was used to analyse GalNAc-T6 and -T3 expressions in 70 clinicopathologically characterised pancreatic cancer cases. RESULTS Positive expressions of GalNAc-T6 and -T3 were immunohistochemically identified in 51% (36 of 70) and in 77% (54 of 70) of patients, respectively. A close relationship was noted between GalNAc-T6 positive expression and pathological well/moderate differentiated type (P=0.001), small tumour size (P=0.044), absence of vascular invasion (P=0.009), and low stage of the American Joint Committee on Cancer systems (P=0.043). The expression of GalNAc-T3 significantly correlated with good differentiation (P=0.001), but not with other clinicopathologic features. Furthermore, univariate and multivariate analyses revealed that GalNAc-T6 expression was an independent prognosis indicator for the disease, whereas GalNAc-T3 expression had no impact on clinical outcome, even though 33 of 36 GalNAc-T6-positive cases also had a positive expression of GalNAc-T3 (P=0.001, r=0.356). CONCLUSION Both GalNAc-T6 and -T3 expressions correlated significantly with tumour differentiation, whereas only GalNAc-T6 expression predicted prognosis in pancreatic cancer.
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Nishi K, Imamura T, Kitamura K, Ogawa T, Fujimoto S, Kakitsubata Y, Ishikawa T, Asada Y, Kodama T. Associations of Plasma Pentraxin 3 and Monocyte Chemoattractant Protein-1 Concentrations with Cardiovascular Disease in Patients with Chronic Kidney Disease. Ren Fail 2011; 33:398-404. [DOI: 10.3109/0886022x.2011.568136] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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110
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Imamura T. Paradigm shift from myocardium-derived to plaque-derived biomarkers for very early diagnosis of acute myocardial infarction. Circ J 2011; 75:1322-3. [PMID: 21532186 DOI: 10.1253/circj.cj-11-0382] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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111
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Sakamoto S, Tsuruda T, Hatakeyama K, Sekita Y, Imamura T, Asada Y, Kitamura K. AGE DEPENDENT AND REGIONAL DIFFERENCE OF INFLAMMATORY RESPONSES IN THE DEVELOPMENT OF ATHEROSCLEROSIS IN APOLIPOPROTEIN E KNOCKOUT MICE. J Am Coll Cardiol 2011. [DOI: 10.1016/s0735-1097(11)61570-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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112
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Kawagoe J, Ideguchi T, Nagoshi T, Imamura T, Kitamura K. A Case of Idioventricular Fibrillation Associated with J Waves rather than Intermittent WPW Syndrome. J Arrhythm 2011. [DOI: 10.4020/jhrs.27.pj1_092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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113
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Kawano S, Kato J, Kawano N, Yoshimura Y, Masuyama H, Fukunaga T, Sato Y, Maruyama H, Mihara K, Ueda A, Toyoda K, Imamura T, Kitamura K. Clinical features and outcomes of eosinophilic myocarditis patients treated with prednisolone at a single institution over a 27-year period. Intern Med 2011; 50:975-81. [PMID: 21532219 DOI: 10.2169/internalmedicine.50.4079] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND Eosinophilic myocarditis is a rare clinical entity characterized by eosinophilia and myocardial inflammation with infiltrating eosinophils. The prognosis of patients with eosinophilic myocarditis is difficult to determine due the disease's rarity and varied causes; consequently, standard treatment has not been established. OBJECTIVE To elucidate the clinical characteristics and treatment outcome of eosinophilic myocarditis, we retrospectively studied 7 patients fulfilling the criteria of the Japanese Circulation Society for eosinophilic myocarditis from among 64 patients admitted to our institution with eosinophilia over a 27-year period. RESULTS The patients' ages at diagnosis ranged from 36 to 83 years (median: 52 years). The etiologies of the eosinophilic myocarditis were found to be idiopathic (3 patients), Churg-Strauss syndrome (2 patients), parasitic infection (1 patient) and chronic eosinophilic leukemia (CEL) (1 patient). In addition to treatment for the underlying disease, we also administered prednisolone at a dose appropriate to the disease severity (6 of 7 patients). The patient who was diagnosed with a parasitic infection was treated only with albendazole, because eosinophilic myocarditis was mild. The patient with CEL was positive for the FIP1 L1-PDGFRα fusion gene and was treated with imatinib. Eosinophilic cationic protein was a useful marker for assessing disease activity and treatment efficacy. At the end of the study, of the seven patients treated, six were alive (86%), giving a mean survival time of 37 ± 40 months (mean ± SD). CONCLUSION Because eosinophilic myocarditis has various etiologies, it is essential to identify the etiology of the underlying disease. In the majority of eosinophilic myocarditis patients, administration of prednisolone may be an effective therapeutic modality producing a good outcome.
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Yanagawa Y, Imamura T, Nishi K, Sakamoto T. Usefulness of computed tomography in the diagnosis of an overdose. Resuscitation 2010. [DOI: 10.1016/j.resuscitation.2010.09.322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Akiyoshi H, Yamashita Y, Sakamoto K, Zhou LB, Imamura T. Recovery of stratospheric ozone in calculations by the Center for Climate System Research/National Institute for Environmental Studies chemistry-climate model under the CCMVal-REF2 scenario and a no-climate-change run. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jd012683] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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116
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Nishihira K, Shibata Y, Ishikawa T, Nomura K, Nakama T, Mine D, Inoue Y, Ashikaga K, Kuriyama N, Matsuyama A, Imamura T, Asada Y, Kitamura K. Repeated sirolimus-eluting stent implantation to treat sirolimus-eluting stent and bare-metal stent restenosis. Circ J 2010; 74:2329-33. [PMID: 20890050 DOI: 10.1253/circj.cj-10-0210] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND In-stent restenosis (ISR) remains a persistent, unresolved issue even in the era of percutaneous coronary intervention (PCI) using drug-eluting stents. The present study compares the clinical and angiographic outcomes of using sirolimus-eluting stents (SES) for re-intervention against ISR that was originally treated with sirolimus-eluting or bare-metal (BMS) stents. METHODS AND RESULTS This prospective single-center registry investigated 179 ISR lesions in 158 consecutive patients (53 lesions in 49, and 126 in 109 patients originally treated with SES and BMS, respectively), who had undergone re-intervention with SES. The patients were clinically and angiographically followed up at 8 months after re-PCI. The incidence of re-restenosis (29 vs 12%, P<0.01), ischemia-driven target lesion revascularization (TLR; 21 vs 8%, P<0.05) and major adverse cardiac events (MACE; 21 vs 9%, P<0.05) were significantly greater in ISR lesions originally treated with SES than in those originally treated with BMS at 8 months after re-PCI. Moreover, late luminal loss was significantly greater in the group with post-SES restenosis (P<0.05). Even after adjustment, post-SES restenosis was the only independent predictor of re-restenosis and MACE (P<0.05, each). CONCLUSIONS Although the re-restenosis rate is acceptable, the incidence rates of late restenosis, ischemia-driven TLR and MACE are higher after repeated SES implantation to treat SES, than BMS restenosis. These results might affect the mid-term clinical outcomes of re-intervention with SES.
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Ogawa T, Kawano Y, Imamura T, Kawakita K, Sagara M, Matsuo T, Kakitsubata Y, Ishikawa T, Kitamura K, Hatakeyama K, Asada Y, Kodama T. Reciprocal contribution of pentraxin 3 and C-reactive protein to obesity and metabolic syndrome. Obesity (Silver Spring) 2010; 18:1871-4. [PMID: 20111016 DOI: 10.1038/oby.2009.507] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Pentraxin 3 (PTX3) is an acute-phase protein that shares structural homology with C-reactive protein (CRP). PTX3 is produced in macrophages, endothelial cells, and adipocytes in response to inflammatory stimuli, whereas hepatocytes are the main source of CRP. Because obesity and metabolic syndrome (MetS) are considered chronic inflammatory states, PTX3 might be involved in the pathogenesis of obesity and MetS as well as CRP. Levels of CRP correlated positively with body weight, BMI, waist circumference (WC), fasting plasma glucose and interleukin (IL)-6, and negatively with high-density lipoprotein cholesterol and adiponectin in healthy males. In contrast, PTX3 correlated positively with adiponectin, and negatively with body weight, BMI, WC, and triglyceride. Plasma CRP significantly increased, whereas plasma PTX3 significantly decreased with increasing BMI. Plasma CRP and PTX3 levels were significantly higher and lower, respectively, in individuals who had more than one MetS component compared with those who had none. In conclusion, PTX3 and CRP antagonistically participate in the development of obesity or MetS.
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Imamura T, Branch J, Ohta B, Ohbuchi H, Yamagami H, Umezawa K. 361: Bloodstream Infections by Extended-Spectrum β-Lactamase-Producing Enterobacteriaceae In the Emergency Department: Risk Factors for Infection. Ann Emerg Med 2010. [DOI: 10.1016/j.annemergmed.2010.06.418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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119
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Sumi T, Yamashita A, Matsuda S, Goto S, Nishihira K, Furukoji E, Sugimura H, Kawahara H, Imamura T, Kitamura K, Tamura S, Asada Y. Disturbed blood flow induces erosive injury to smooth muscle cell-rich neointima and promotes thrombus formation in rabbit femoral arteries. J Thromb Haemost 2010; 8:1394-402. [PMID: 20230423 DOI: 10.1111/j.1538-7836.2010.03843.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND Plaque erosion is a cause of atherothrombosis that preferentially occurs on smooth muscle cell (SMC)- and proteoglycan-rich rather than lipid-rich plaques. However, its underlying mechanisms remain unknown. OBJECTIVE To determine whether disturbed blood flow induces erosive injury and thrombus formation on SMC-rich neointima. METHODS Three weeks after balloon injury, SMC-rich neointima with increased tissue factor (TF) activity developed in rabbit femoral arteries that were narrowed with a vascular occluder to disturb blood flow after stenosis. Neointimal injury and thrombus formation were assessed at 15, 30, and 180 min after the vascular narrowing. RESULTS Endothelial detachment, platelet adhesion and neointimal cell apoptosis became evident at the post-stenotic regions of all femoral arteries (n = 5) within 15 min of narrowing. Mural thrombi composed of platelet and fibrin developed after 30 min, and then occlusive thrombi were generated in three out of five vessels after 180 min. The identical vascular narrowing of normal femoral arteries also induced endothelial detachment with small platelet thrombi at post-stenotic regions, but fibrin and occlusive thrombi did not develop. Computational simulation analysis indicated that oscillatory shear stress contributes to the development of erosive damage to the neointima. CONCLUSIONS These results suggest that disturbed post-stenotic blood flow can induce erosive injury in SMC-rich plaques and promote thrombus formation that results in vascular events.
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Ide H, Terado Y, Tokiwa S, Nishio K, Saito K, Isotani S, Kamiyama Y, Muto S, Imamura T, Horie S. Novel Germ Line Mutation p53-P177R in Adult Adrenocortical Carcinoma Producing Neuron-specific Enolase as a Possible Marker. Jpn J Clin Oncol 2010; 40:815-8. [DOI: 10.1093/jjco/hyq045] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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121
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Tsuruda T, Imamura T, Hatakeyama K, Asada Y, Kitamura K. Stromal cell biology--a way to understand the evolution of cardiovascular diseases. Circ J 2010; 74:1042-50. [PMID: 20378995 DOI: 10.1253/circj.cj-10-0024] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Stromal cells, composed of fibroblasts, microvascular endothelial cells, immune cells and inflammatory cells, are critical determinants of the mechanical properties and function of the heart and vasculature, and the mechanisms whereby these types of cells are activated are important to understand the progression of cardiovascular diseases. Emerging studies have suggested that the activation of autocrine and paracrine signaling pathways by stromal cell-derived growth factors, cytokines and bioactive molecules contributes to disease progression. Disruption of the stromal network will result in alterations in the geometry and function in these organs. Interventions targeting the stromal cells (eg, myofibroblasts, microvascular endothelial cells, inflammatory cells) by pharmacological agents or direct gene delivery/small interfering RNA would be potential novel therapeutic strategies to prevent/attenuate the progression of cardiovascular disorders.
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Yano Y, Matsuda S, Hatakeyama K, Sato Y, Imamura T, Shimada K, Kodama T, Kario K, Asada Y. Plasma Pentraxin 3, but not high-sensitivity C-reactive protein, is a useful inflammatory biomarker for predicting cognitive impairment in elderly hypertensive patients. J Gerontol A Biol Sci Med Sci 2010; 65:547-52. [PMID: 20203097 DOI: 10.1093/gerona/glq030] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Due to the increasing longevity of human populations worldwide, there is need of a useful biomarker for the early detection of cognitive impairment in elderly persons. Both high blood pressure (BP) and inflammatory processes have been reported to be involved in cognitive impairment via cerebrovascular atherosclerosis or neuronal cell damage. METHODS In this cross-sectional study of 210 ambulatory elderly hypertensive patients without clinically evident dementia (mean age: 74 years; 44% men), we measured 24-hour BP, circulatory pentraxin 3 (PTX3) and high-sensitivity C-reactive protein (hs-CRP) levels, and cognitive function (Mini-Mental State Examination [MMSE]). RESULTS A high plasma PTX3 level was observed in lean subjects, especially in those whose current body weight was lower than that measured 5 years earlier, whereas a high hs-CRP level was associated with obesity (all p < .05). Both PTX3 and hs-CRP levels were significantly associated with the MMSE score (r = -.248, p<0.001 and r = -.153, p<0.05, respectively); however, in multiple regression analysis, the PTX3 level, but not the hs-CRP level, was inversely associated with the MMSE score independently of patient demographics, glucose and lipid metabolic parameters, 24-hour systolic BP (SBP) level, and the atherosclerotic burden (all p < .05). Moreover, there was a significant interaction between the PTX3 and 24-hour SBP levels in the determinants of MMSE score (p < .05). CONCLUSIONS A high plasma PTX3 level in elderly hypertensive patients, particularly in those with a high 24-hour BP level, could be a significant predictor of cognitive impairment. A high PTX3 level may be a marker of frailty in elderly hypertensive patients.
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Matsuura Y, Imamura T, Hatakeyama K, Shibata Y, Kodama T, Kitamura K, Asada Y. PENTRAXIN 3 IS INVOLVED IN PATHOGENESIS OF UNSTABLE PLAQUE ASSOCIATED WITH INTRAPLAQUE HEMORRHAGE. J Am Coll Cardiol 2010. [DOI: 10.1016/s0735-1097(10)61538-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Kawagoe J, Imamura T, Kubo K, Sakamoto S, Nagatomo E, Matsuura Y, Ideguchi T, Tsuruda T, Onitsuka H, Kawamoto R, Ishikawa T, Nagoshi T, Date H, Kitamura K. SIGNIFICANCE OF CARDIAC TROPONIN T LEVELS IN SUPRAVENTRICULAR TACHYCARDIA. J Am Coll Cardiol 2010. [DOI: 10.1016/s0735-1097(10)60079-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Go H, Hashimoto K, Imamura T, Sato M, Kawasaki Y, Momoi N, Hosoya M. An extremely low body weight infant born to a mother with measles. J Perinatol 2010; 30:146-8. [PMID: 20118942 DOI: 10.1038/jp.2009.111] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The incidence of measles epidemics has decreased recently owing to the development and widespread use of measles vaccine in the United States of America and Europe. However, repeated measles epidemics have been reported in Japan. Here, the authors report a case of an extremely low body weight infant (ELBWI) whose mother had a measles virus infection. Real-time PCR was performed on the infant's blood and urine samples and skin, nasal secretion, and anal swabs, as well as on the mother's breast milk, blood samples and throat swabs. The infant was found to be positive for measles virus by PCR, but not immunoglobulin M positive. An earlier report showed that there were no such cases in which the patient was found to be positive for measles virus by real-time PCR but was not infected by the measles virus.
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Imamura T. Should β-Blockers Be Prescribed More Frequently to Japanese Patients With Coronary Artery Disease? Circ J 2010; 74:848-9. [DOI: 10.1253/circj.cj-10-0236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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127
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Yamashita A, Matsuda S, Matsumoto T, Moriguchi-Goto S, Takahashi M, Sugita C, Sumi T, Imamura T, Shima M, Kitamura K, Asada Y. Thrombin generation by intimal tissue factor contributes to thrombus formation on macrophage-rich neointima but not normal intima of hyperlipidemic rabbits. Atherosclerosis 2009; 206:418-26. [DOI: 10.1016/j.atherosclerosis.2009.03.014] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2008] [Revised: 03/02/2009] [Accepted: 03/15/2009] [Indexed: 11/25/2022]
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128
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Imamura T, Ohta B, Tanaka E, Branch J. 121: Prognosis of Urosepsis Patients Who Are Treated by Inappropriate Initial Antimicrobial Therapy in the Emergency Department. Ann Emerg Med 2009. [DOI: 10.1016/j.annemergmed.2009.06.148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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129
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Tsuruda T, Hatakeyama K, Masuyama H, Sekita Y, Imamura T, Asada Y, Kitamura K. Pharmacological stimulation of soluble guanylate cyclase modulates hypoxia-inducible factor-1alpha in rat heart. Am J Physiol Heart Circ Physiol 2009; 297:H1274-80. [PMID: 19684186 DOI: 10.1152/ajpheart.00503.2009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Mechanical load and ischemia induce a series of adaptive physiological responses by activating the expression of O(2)-regulated genes, such as hypoxia inducible factor-1alpha (HIF-1alpha). The aim of this study was to explore the interaction between HIF-1alpha and soluble guanylate cyclase (sGC) and its second messenger cGMP in cultured cardiomyocytes exposed to hypoxia and in pressure-overloaded heart. In cultured cardiomyocytes of neonatal rats, either sGC stimulator BAY 41-2272 or cGMP analog 8-bromo-cGMP decreased the hypoxia (1% O(2)/5% CO(2))-induced HIF-1alpha expression, whereas the inhibition of protein kinase G by KT-5823 reversed the effect of BAY 41-2272 on the expression under hypoxic conditions. In pressure-overloaded heart induced by suprarenal aortic constriction (AC) in 7-wk-old male Wistar rats, the administration of BAY 41-2272 (2 mg.kg(-1).day(-1)) for 14 days significantly suppressed the protein expression of HIF-1alpha (P < 0.05), vascular endothelial growth factor (P < 0.01), and the number of capillary vessels (P < 0.01) induced by pressure overload. This study suggests that the pharmacological sGC-cGMP stimulation modulates the HIF-1alpha expression in response to hypoxia or mechanical load in the heart.
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Satoh T, Imamura T, Hashimoto GL, Iwagami N, Mitsuyama K, Sorahana S, Drossart P, Piccioni G. Cloud structure in Venus middle‐to‐lower atmosphere as inferred from VEX/VIRTIS 1.74μm data. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008je003184] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Akiyoshi H, Zhou LB, Yamashita Y, Sakamoto K, Yoshiki M, Nagashima T, Takahashi M, Kurokawa J, Takigawa M, Imamura T. A CCM simulation of the breakup of the Antarctic polar vortex in the years 1980–2004 under the CCMVal scenarios. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2007jd009261] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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132
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Etoh T, Kato J, Takenaga M, Imamura T, Kitamura K, Koiwaya Y, Eto T. Differential hormonal profiles of adrenomedullin and proadrenomedullin N-terminal 20 peptide in patients with heart failure and effect of treatment on their plasma levels. Clin Cardiol 2009; 22:113-7. [PMID: 10068849 PMCID: PMC6655257 DOI: 10.1002/clc.4960220211] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
BACKGROUND Adrenomedullin (AM) is a potent vasodilatory peptide discovered in human pheochromocytoma tissue. Proadrenomedullin N-terminal 20 peptide (PAMP) processed from an AM precursor is also a novel hypotensive peptide which inhibits catecholamine secretion from sympathetic nerve endings. HYPOTHESIS The present study sought to examine the relationships between the two peptides and other clinical parameters by measuring the plasma AM and PAMP concentrations in 98 patients with heart failure. METHODS In all, 98 patients [65 men and 33 women, aged 58.2 +/- 11.0 years, mean +/- standard deviation (SD)] with heart failure and 26 healthy volunteers (12 men and 14 women, aged 54.1 +/- 8.6 years) were examined in this study. Heart failure was secondary to previous myocardial infarction in 58 patients, valvular disease in 28, cardiomyopathy in 9, and congenital heart disease in 3. All patients were classified into two groups of class I or II (Group 1) and class III or IV (Group 2) according to the New York Heart Association (NYHA) functional classification. RESULTS Both plasma AM and PAMP concentrations in the patients were significantly higher than those in healthy volunteers. In addition, plasma AM and PAMP concentrations in patients in class III or IV of New York Heart Association (NYHA) classification were significantly higher than those in NYHA class I or II. The elevated plasma concentrations of these peptides in patients in NYHA class III or IV significantly decreased in response to the treatment for 7 days. There was a significant correlation between plasma AM and PAMP, though the plasma concentration of PAMP was one-fifth to one-seventh of that of AM in patients and controls. The plasma AM concentration correlated significantly with the plasma concentrations of atrial and brain natriuretic peptides, epinephrine, and right atrial pressure, whereas such a relationship was not noted for the plasma PAMP concentration. CONCLUSIONS Judging from the difference in not only the biological actions but also the hormonal profiles between AM and PAMP, they may differentially modulate the cardiovascular system in patients with heart failure, although they are processed from the same precursor.
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Suzuki H, Takasawa H, Kobayashi K, Terashima Y, Shimada Y, Ogawa I, Tanaka J, Imamura T, Miyazaki A, Hayashi M. Evaluation of a liver micronucleus assay with 12 chemicals using young rats (II): a study by the Collaborative Study Group for the Micronucleus Test/Japanese Environmental Mutagen Society-Mammalian Mutagenicity Study Group. Mutagenesis 2008; 24:9-16. [DOI: 10.1093/mutage/gen047] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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134
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Kawagoe J, Imamura T, Date H, Ideguchi T, Koyama S, Nagoshi Y, Tatsumoto M, Onitsuka H, Iwakiri H, Kitamura K. Reciprocal production of adiponectin and C-reactive protein in coronary circulation of patients with and without coronary artery disease. Horm Metab Res 2008; 40:578-80. [PMID: 18459084 DOI: 10.1055/s-2008-1073150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Katsuno Y, Hanyu A, Kanda H, Ishikawa Y, Akiyama F, Iwase T, Ogata E, Ehata S, Miyazono K, Imamura T. Bone morphogenetic protein signaling enhances invasion and bone metastasis of breast cancer cells through Smad pathway. Oncogene 2008; 27:6322-33. [PMID: 18663362 DOI: 10.1038/onc.2008.232] [Citation(s) in RCA: 175] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Transforming growth factor (TGF)-beta is known to promote tumor invasion and metastasis. Although bone morphogenetic proteins (BMPs), members of the TGF-beta family, are expressed in a variety of human carcinoma cell lines, their roles in tumor progression have not been fully clarified. In this study, we sought to determine the roles of BMPs in the progression of breast cancer bone metastasis using human breast cancer samples and a mouse xenograft model. Immunohistochemical analysis of samples from breast cancer patients as well as a mouse xenograft model of MDA-231-D, highly metastatic human breast cancer cells, revealed phospho-Smad2 and phospho-Smad1/5/8 staining in the nuclei of cancer cells in primary tumor and/or bone metastasis. Using a functional in vivo bioluminescence imaging system, we showed that TGF-beta- and BMP-induced transcriptional pathways are active in bone metastatic lesions in vivo. In addition, both TGF-beta3 and BMP-2 promoted the motility and invasiveness of the MDA-231-D cells in vitro. Moreover, expression of dominant-negative receptors for TGF-beta and/or BMPs in the MDA-231-D cells inhibited invasiveness in vitro and bone metastasis in the xenograft model. These results suggest that BMPs as well as TGF-beta promote invasion and bone metastasis of breast cancer.
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Kashihara K, Ohno M, Kawada S, Imamura T. Frequent nocturnal vocalization in pure autonomic failure. J Int Med Res 2008; 36:489-95. [PMID: 18534130 DOI: 10.1177/147323000803600313] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Nocturnal vocalization is frequent in Parkinson's disease patients with rapid eye movement (REM) sleep behaviour disorder (RBD). We investigated the frequency of nocturnal vocalization and other sleep problems in patients with pure autonomic failure (PAF) and compared the results with idiopathic Parkinson's disease (IPD) and dementia with Lewy bodies (DLB). We interviewed consecutive patient-caregiver pairs with PAF (n = 13), IPD (n = 200) and DLB (n = 19), and ischaemic stroke patients (controls, n = 43). Nocturnal vocalization was similarly frequent in PAF, IPD and DLB. Other dream enactments and vivid dreams also were more frequent in PAF, IPD and DLB compared with controls. Excessive night-time awakenings and daytime sleepiness were frequent in IPD but rare in PAF and controls. Clinical manifestation of sleep disturbances, at least of RBD-like symptoms including nocturnal vocalization and other dream enactments, may occur in PAF, as in IPD and DLB.
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Khan KN, Kitajima M, Imamura T, Hiraki K, Fujishita A, Sekine I, Ishimaru T, Masuzaki H. Toll-like receptor 4-mediated growth of endometriosis by human heat-shock protein 70. Hum Reprod 2008; 23:2210-9. [DOI: 10.1093/humrep/den195] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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138
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Nishihira K, Yamashita A, Tanaka N, Moriguchi-Goto S, Imamura T, Ishida T, Kawashima S, Yamamoto R, Kitamura K, Asada Y. Serotonin induces vasoconstriction of smooth muscle cell-rich neointima through 5-hydroxytryptamine2A receptor in rabbit femoral arteries. J Thromb Haemost 2008; 6:1207-14. [PMID: 18435827 DOI: 10.1111/j.1538-7836.2008.02996.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Smooth muscle cell (SMC)-rich intima is a morphological feature of atherosclerotic lesions that is observed in eroded plaque and spastic arteries. Arteries with SMC-rich intima are susceptible to vasoconstriction or vasospasm against some vasoactive agents. OBJECTIVE The present study evaluates the contribution of SMC-rich intima to thrombogenic vasoconstriction. METHODS We established SMC-rich neointima by damaging rabbit femoral arteries using balloons and then measured the isometric tension of the femoral strips against 5-hydroxytryptamine (5-HT), adenosine diphosphate, adenosine triphosphate and thrombin. RESULTS Among these agents, only 5-HT induced a hypercontractile response of the injured arteries with SMC-rich neointima, compared with non-injured arteries. Smooth muscle cells of both the neointima and media expressed 5-HT(2A) receptor, and sarpogrelate, a selective 5-HT(2A) receptor antagonist significantly inhibited the hypercontraction. Furthermore, 5-HT induced contraction of separated neointima and hypercontraction of separated media compared with non-injured media. Sarpogrelate and fasudil, a specific Rho-kinase inhibitor, significantly suppressed such contraction of both the neointima and media of injured arteries. CONCLUSIONS These results suggest that 5-HT plays a crucial role in thrombogenic vasoconstriction, and that SMC-rich intima as well as media directly contributes to the hypercontractile response of atherosclerotic vessels through the 5-HT(2A) receptor and the Rho-kinase pathway.
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Imamura T, Kanagawa Y, Ebisawa M. A survey of patients with self-reported severe food allergies in Japan. Pediatr Allergy Immunol 2008; 19:270-4. [PMID: 18397411 DOI: 10.1111/j.1399-3038.2007.00621.x] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Food allergies have increased in recent years in Japan. Details of causative foods, places where anaphylaxis developed, and other allergic factors remain unknown, and we investigated them. A'questionnaire survey for the prevention of food allergies' was conducted using a nationwide group of patients with food allergies. A total of 1383 patients from 878 families (including 319 patients who experienced anaphylaxis) provided valid answers to the questionnaire. The average age of the first anaphylactic attack was 3.20 +/- 6.327 yr. The most common allergens causing anaphylaxis were in order milk, eggs, wheat, peanuts, and soybeans, followed by sesame and buckwheat. The most common place where anaphylaxis developed was the patient's own home, followed by fast food restaurants, places visited, restaurants, and schools. In patients' own homes, fast food restaurants (buffet), places visited and schools, the most common allergens were milk, eggs, and wheat. In restaurants and accommodation facilities, eggs were the most common allergen followed by milk. As possible food allergies can cause anaphylaxis, it is necessary to provide precise information for consumers regarding packaged and processed foods.
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Tsuruda T, Kato J, Hatakeyama K, Kojima K, Yano M, Yano Y, Nakamura K, Nakamura-Uchiyama F, Matsushima Y, Imamura T, Onitsuka T, Asada Y, Nawa Y, Eto T, Kitamura K. Adventitial mast cells contribute to pathogenesis in the progression of abdominal aortic aneurysm. Circ Res 2008; 102:1368-77. [PMID: 18451339 DOI: 10.1161/circresaha.108.173682] [Citation(s) in RCA: 114] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abdominal aortic aneurysm (AAA) is histologically characterized by medial degeneration and various degrees of chronic adventitial inflammation, although the mechanisms for progression of aneurysm are poorly understood. In the present study, we carried out histological study of AAA tissues of patients, and interventional animal and cell culture experiments to investigate a role of mast cells in the pathogenesis of AAA. The number of mast cells was found to increase in the outer media or adventitia of human AAA, showing a positive correlation between the cell number and the AAA diameter. Aneurysmal dilatation of the aorta was seen in the control (+/+) rats following periaortic application of calcium chloride (CaCl2) treatment but not in the mast cell-deficient mutant Ws/Ws rats. The AAA formation was accompanied by accumulation of mast cells, T lymphocytes and by activated matrix metalloproteinase 9, reduced elastin levels and augmented angiogenesis in the aortic tissue, but these changes were much less in the Ws/Ws rats than in the controls. Similarly, mast cells were accumulated and activated at the adventitia of aneurysmal aorta in the apolipoprotein E-deficient mice. The pharmacological intervention with the tranilast, an inhibitor of mast cell degranulation, attenuated AAA development in these rodent models. In the cell culture experiment, a mast cell directly augmented matrix metalloproteinase 9 activity produced by the monocyte/macrophage. Collectively, these data suggest that adventitial mast cells play a critical role in the progression of AAA.
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Nishihira K, Yamashita A, Imamura T, Hatakeyama K, Sato Y, Nakamura H, Yodoi J, Ogawa H, Kitamura K, Asada Y. Thioredoxin in coronary culprit lesions: possible relationship to oxidative stress and intraplaque hemorrhage. Atherosclerosis 2008; 201:360-7. [PMID: 18420212 DOI: 10.1016/j.atherosclerosis.2008.03.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2007] [Revised: 03/06/2008] [Accepted: 03/10/2008] [Indexed: 11/25/2022]
Abstract
The present study investigated the expression of thioredoxin (TRX), an important anti-oxidative protein, and its relationship to plaque instability in atherectomy specimens from 43 and 42 patients with stable (SAP) and unstable (UAP) angina pectoris, respectively. We histologically assessed thrombus formation, cellular elements, localization of TRX and of oxidized low density lipoprotein (ox-LDL), intraplaque hemorrhage, and transition metal iron (Fe(2+), Fe(3+)) deposition in these specimens. The clinical characteristics of the two groups did not differ except for aspirin administration. The incidence of thrombus formation was more frequent (P=0.005) and immunopositive areas of macrophage, TRX and ox-LDL were significantly larger in patients with UAP than SAP (P<0.001, each). Macrophages were mainly immunoreactive for TRX and ox-LDL. Intraplaque hemorrhage evaluated by glycophorin A immunoreactivity and Fe(2+)/Fe(3+) deposition was also more obvious in lesions from patients with UAP than SAP (P<0.001, each). Additionally, immunopositive areas of TRX and ox-LDL positively correlated with Fe(2+)/Fe(3+) deposition and were also associated with thrombus formation. Although the underlying mechanisms remain unknown, TRX was up-regulated in response to increased oxidative stress and associated with intraplaque hemorrhage of coronary culprit lesions, and thus might be a potent marker of plaque instability.
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Uehara A, Imamura T, Potempa J, Travis J, Takada H. Gingipains from Porphyromonas gingivalis synergistically induce the production of proinflammatory cytokines through protease-activated receptors with Toll-like receptor and NOD1/2 ligands in human monocytic cells. Cell Microbiol 2008; 10:1181-9. [PMID: 18182086 DOI: 10.1111/j.1462-5822.2008.01119.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Gingipains (HRgpA, RgpB and Kgp) are cysteine proteinases and virulence factors of Porphyromonas gingivalis, the major causative bacterium of periodontal disease. To study synergistic effects of gingipains and signalling via Toll-like receptors (TLRs) and NOD1/2, we investigated effects of a gingipain on the secretion of proinflammatory cytokines from monocytic THP-1 cells in the presence of pathogen-associated molecular patterns (PAMPs). Gingipains stimulated interleukin (IL)-8's secretion from THP-1 cells, which was completely inhibited by proteinase inhibitors of gingipain and increased in the presence of PAMPs. Synergistic effects of gingipains and PAMPs were also seen in the secretion of IL-6 and MCP-1 and reduced to about 50% the secretion of IL-8 from THP-1 cells treated with siRNA targeting either protease-activated receptor (PAR)-1, -2 or -3. PAR agonist peptides mimicked the synergistic effects of gingipains with PAMPs. These results indicate that gingipains stimulate the secretion of cytokines from monocytic cells through the activation of PARs with synergistic effects by PAMPs. This is the first report of synergism of signalling via PARs, and TLRs or NOD1/2. The host defence system against P. gingivalis may be triggered through the activation of PARs by gingipains and augmented by PAMPs from this pathogen via TLRs or NOD1/2.
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Ebisuzaki T, Uehara Y, Ohmori H, Kawai K, Kawasaki Y, Sato M, Takizawa Y, Bertaina M, Kajino F, Sawabe T, Inoue K, Sasaki A, Sakata M, Yamamoto Y, Nagano M, Inoue N, Shibata T, Sakaki N, Uchihori Y, Takahashi Y, Shimizu H, Arai Y, Kurihara Y, Fujimoto H, Yoshida S, Mizumoto Y, Inoue S, Asano K, Sugiyama T, Watanabe J, Ikeda H, Suzuki M, Imamura T, Yano H, Murakami T, Yonetoku D, Itow Y, Taguchi M, Nagata M, Nagataki S, Abe S, Tajima T, Adams J, Mitchell S, Christl M, Watts J, English A, Takahashi Y, Pitalo K, Hadaway J, Geary J, Readon P, Crawford H, Pennypacker C, Arisaka K, Cline D, Gorodetsky P, Salin P, Patzark T, Maurissen A, Valentin M. The JEM-EUSO Project: Observing Extremely High Energy Cosmic Rays and Neutrinos from the International Space Station. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.nuclphysbps.2007.11.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Pätzold M, Häusler B, Bird MK, Tellmann S, Mattei R, Asmar SW, Dehant V, Eidel W, Imamura T, Simpson RA, Tyler GL. The structure of Venus’ middle atmosphere and ionosphere. Nature 2007; 450:657-60. [DOI: 10.1038/nature06239] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2007] [Accepted: 09/05/2007] [Indexed: 11/09/2022]
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Saito A, Okano H, Bamba H, Hisa Y, Oomura Y, Imamura T, Tooyama I. Low expression of FGF1 (fibroblast growth factor-1) in rat parasympathetic preganglionic neurons. Histol Histopathol 2007; 22:1327-35. [PMID: 17701912 DOI: 10.14670/hh-22.1327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Fibroblast growth factor-1 (FGF1), a member of the FGF family of growth factors, is localized in cholinergic neurons where it has trophic activity. We recently reported that cholinergic neurons in the dorsal motor nucleus of the vagus (DMNV) contain little FGF1, raising the possibility that FGF1 is not localized to parasympathetic preganglionic cholinergic neurons. To clarify this issue, we investigated the co-localization of FGF1 with cholinergic neuron markers in the Edinger-Westphal nucleus (EWN), salivatory nucleus, DMNV, and sacral parasympathetic nucleus by double immunofluorescence using antibodies to FGF1 and choline acetyltransferase (ChAT). The neurons in the EWN were devoid of FGF1. In the salivatory nucleus, 13% of ChAT-positive neurons were also positive for FGF1. In the DMNV, only 8% of ChAT-positive neurons contained FGF1, and in the sacral parasympathetic nucleus, 18% of ChAT-positive neurons were FGF1-positive. We also confirmed that a large number of ChAT-positive motor neurons in the oculomotor nucleus, facial nucleus, hypoglossal nucleus, and spinal motor neurons contained FGF1. The results confirmed that parasympathetic preganglionic neurons are largely devoid of FGF1, which is a unique feature among cholinergic neurons.
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Tsuruda T, Kato J, Sumi T, Mishima K, Masuyama H, Nakao H, Imamura T, Eto T, Kitamura K. Combined use of brain natriuretic peptide and C-reactive protein for predicting cardiovascular risk in outpatients with type 2 diabetes mellitus. Vasc Health Risk Manag 2007; 3:417-23. [PMID: 17969372 PMCID: PMC2291340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Appropriate tools are necessary for predicting cardiovascular events in patients with diabetes mellitus because of their high incidence. In this study, we assessed whether a combination of brain natriuretic peptide (BNP) and C-reactive protein (CRP) measurement were useful prognosticators in patients with type 2 diabetes mellitus. One hundred and nine patients with type 2 diabetes mellitus, aged 52 to 93 years, were examined at outpatient clinics for blood, urinary samples, and echocardiography. They were then followed prospectively. During the average follow-up period of 30 months (range, 3 to 37), 15 patients (14%) had cardiovascular events: This was the first event in 5 patients and a recurrence in 10. Cox regression analysis showed that the past event (hazard ratio [HR] 4.819 [95% confidence interval (CI): 1.299-17.881]; p = 0.019) and plasma BNP level (HR 1.007 [95% CI: 1.002-1.012]; p = 0.010] were independently significant factors for the cardiovascular events during the follow-up period. Patients with plasma BNP > or =53 pg/mL and CRP > or =0.95 mg/dL demonstrated the highest incidence in cardiovascular event, compared to those categorized into either or both low levels of BNP and CRP. This study suggests that combination of plasma BNP and CRP measurement provides the additive prognostic information of cardiovascular events in patients with type 2 diabetes mellitus.
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Hatakeyama K, Imamura T, Nishihira K, Tsuruda T, Shibata Y, Ito Y, Miyamoto K, Sagara M, Kodama T, Asada Y. PO9-264 RELATION OF PTX3 TO PLAQUE INSTABILITY AND RESTENOSIS IN ATHERECTOMY SPECIMENS FROM PATIENTS WITH STABLE ANGINA AND ACUTE CORONARY SYNDROMES. ATHEROSCLEROSIS SUPP 2007. [DOI: 10.1016/s1567-5688(07)71274-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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148
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Nishihira K, Imamura T, Hatakeyama K, Yamashita A, Shibata Y, Date H, Manabe I, Nagai R, Kitamura K, Asada Y. Expression of interleukin-18 in coronary plaque obtained by atherectomy from patients with stable and unstable angina. Thromb Res 2007; 121:275-9. [PMID: 17512041 DOI: 10.1016/j.thromres.2007.04.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2007] [Revised: 03/29/2007] [Accepted: 04/09/2007] [Indexed: 10/23/2022]
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Imamura T, Konishi K, Yokoyama M, Konishi K. High-Speed Gel Filtration of Polypeptides in Some Denaturants. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/01483918108059959] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Shimanuki T, Hara T, Furuya T, Imamura T, Miyazono K. Modulation of the functional binding sites for TGF-β on the type II receptor leads to suppression of TGF-β signaling. Oncogene 2006; 26:3311-20. [PMID: 17146441 DOI: 10.1038/sj.onc.1210123] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Transforming growth factor-beta (TGF-beta) binds to two different types of serine/threonine kinase receptors termed type II (TbetaR-II) and type I (TbetaR-I). TGF-beta is unable to bind to TbetaR-I in the absence of TbetaR-II, and initiates receptor assembly by binding with high affinity to TbetaR-II. Previous structural analysis of the TGF-beta3-TbetaR-II complex has suggested that two charged amino acid residues, D55 and E142 of TbetaR-II, are binding sites of TGF-beta. In the present study, we have shown that mutations of the amino-acid residues, D55 and E142 of TbetaR-II, resulted in loss of TGF-beta binding and downstream signaling activity. Moreover, we found that 3,5,7,2',4'-pentahydroxyflavone (Morin) inhibits TGF-beta binding to TbetaR-II, and suppresses phosphorylation of Smad2 and expression of a TGF-beta target gene Smad7 induced by TGF-beta. Our findings may thus provide useful information for designing therapeutic agents for various diseases induced by TGF-beta, including advanced cancers.
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