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Hirata K, Wake M, Takahashi T, Nakazato J, Yagi N, Miyagi T, Shimotakahara J, Mototake H, Tengan T, Takara TR, Yamaguchi Y. Clinical Predictors for Delayed or Inappropriate Initial Diagnosis of Type A Acute Aortic Dissection in the Emergency Room. PLoS One 2015; 10:e0141929. [PMID: 26559676 PMCID: PMC4641684 DOI: 10.1371/journal.pone.0141929] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 10/14/2015] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Initial diagnosis of acute aortic dissection (AAD) in the emergency room (ER) is sometimes difficult or delayed. The aim of this study is to define clinical predictors related to inappropriate or delayed diagnosis of Stanford type A AAD. METHODS We conducted a retrospective analysis of 127 consecutive patients with type A AAD who presented to the ER within 12 h of symptom onset (age: 69.0 ± 15.4 years, male/female = 49/78). An inappropriate initial diagnosis (IID) was considered if AAD was not included in the differential diagnosis or if chest computed tomography or echocardiography was not performed as initial imaging tests. Clinical variables were compared between IID and appropriate diagnosis group. The time to final diagnosis (TFD) was also evaluated. Delayed diagnosis (DD) was defined as TFD > third quartile. Clinical factors predicting DD were evaluated in comparison with early diagnosis (defined as TFD within the third quartile). In addition, TFD was compared with respect to each clinical variable using a rank sum test. RESULTS An IID was determined for 37% of patients. Walk-in (WI) visit to the ER [odds ratio (OR) 2.6, 95% confidence interval (CI) = 1.01-6.72, P = 0.048] and coronary malperfusion (CM, OR = 6.48, 95% CI = 1.14-36.82, P = 0.035) were predictors for IID. Overall, the median TFD was 1.5 h (first/third quartiles = 0.5/4.0 h). DD (>4.5 h) was observed in 27 cases (21.3%). TFD was significantly longer in WI patients (median and first/third quartiles = 1.0 and 0.5/2.85 h for the ambulance group vs. 3.0 and 1.0/8.0 h for the WI group, respectively; P = 0.003). Multivariate analysis revealed that WI visit was the only predictor for DD (OR = 3.72, 95% CI = 1.39-9.9, P = 0.009). TFD was significantly shorter for appropriate diagnoses than for IIDs (1.0 vs. 6.0 h, respectively; P < 0.0001). CONCLUSIONS WI visit to the ER and CM were predictors for IID, and WI was the only predictor for DD in acute type A AAD in the community hospital.
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Miyagi T, Itonaga H, Aosai F, Taguchi J, Norose K, Mochizuki K, Fujii H, Furumoto A, Ohama M, Karimata K, Yamanoha A, Taniguchi H, Sato S, Taira N, Moriuchi Y, Fukushima T, Masuzaki H, Miyazaki Y. Successful treatment of toxoplasmic encephalitis diagnosed early by polymerase chain reaction after allogeneic hematopoietic stem cell transplantation: two case reports and review of the literature. Transpl Infect Dis 2015; 17:593-8. [PMID: 25970830 DOI: 10.1111/tid.12401] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Revised: 03/31/2015] [Accepted: 04/17/2015] [Indexed: 11/26/2022]
Abstract
Toxoplasmic encephalitis represents a rare, but often fatal infection after allogeneic hematopoietic stem cell transplantation. Polymerase chain reaction (PCR)-based preemptive therapy is considered promising for this disease, but is not routinely applied, especially in low seroprevalence countries including Japan. We encountered 2 cases of toxoplasmic encephalitis after transplantation that were successfully treated. The diagnosis of toxoplasmic encephalitis in these cases was confirmed by PCR testing when neurological symptoms were observed. Both patients received pyrimethamine and sulfadiazine treatments within 2 weeks of the development of neurological symptoms, and remained free of recurrence for 32 and 12 months. These results emphasized the importance of the PCR test and immediate treatment after diagnosis for the management of toxoplasmic encephalitis.
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Hirata K, Wake M, Takahashi T, Nakazato J, Yagi N, Miyagi T, Shimotakahara J, Takara T, Tengan T. CLINICAL PREDICTORS FOR INAPPROPRIATE INITIAL DIAGNOSIS OF ACUTE TYPE A AORTIC DISSECTION IN THE EMERGENCY ROOM. J Am Coll Cardiol 2015. [DOI: 10.1016/s0735-1097(15)62104-0] [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: 10/23/2022]
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Oze T, Hiramatsu N, Yakushijin T, Yamada R, Harada N, Morishita N, Oshita M, Mita E, Ito T, Inui Y, Inada M, Tamura S, Yoshihara H, Imai Y, Kato M, Miyagi T, Yoshida Y, Tatsumi T, Kasahara A, Hayashi N, Takehara T. The real impact of telaprevir dosage on the antiviral and side effects of telaprevir, pegylated interferon and ribavirin therapy for chronic hepatitis C patients with HCV genotype 1. J Viral Hepat 2015; 22:254-62. [PMID: 25081140 DOI: 10.1111/jvh.12289] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2014] [Accepted: 05/14/2014] [Indexed: 01/28/2023]
Abstract
Triple therapy with telaprevir, pegylated interferon and ribavirin has been reported to improve antiviral efficacy but have potentially severe adverse effects in patients with chronic hepatitis C. To avoid the severe effects of telaprevir, lowering the dose has been suggested. However, impact of dosage changes on antiviral and adverse effects remains unclear. One hundred and sixty-six Japanese patients with HCV genotype 1 were treated with triple therapy. The drug exposure of each medication was calculated by averaging the dose actually taken. The overall SVR rate was 82%. The telaprevir discontinuation rate was 26%. The factors associated with discontinuation were an older age (≥65 y.o.) and a higher average dose during treatment. The telaprevir discontinuation rates were 42%, 25% and 14% in patients at ≥35, 25-35 and <25 mg/kg/day of telaprevir and 58% in older patients at ≥35 mg/kg/day of TVR. The factors associated with SVR were treatment-naïve, relapse to previous treatment, higher average telaprevir dose during treatment and completion of treatment. The SVR rate was higher, at 91%, in patients at 25-35 mg/kg/day of telaprevir than the 71% and 78% observed in those at <25 and ≥35 mg/kg/day of drug. In Japanese patients, a mean telaprevir dose of 25-35 mg/kg/day during treatment can augment its efficacy in triple therapy for patients with HCV genotype 1.
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Asaumi Y, Noguchi T, Morita Y, Fujiwara R, Kanaya T, Matsuyama TA, Kawasaki T, Fujino M, Yamane T, Nagai T, Miyagi T, Ishibashi-Ueda H, Higashi M, Komori Y, Ishihara M, Ogawa H, Yasuda S. High-Intensity Plaques on Noncontrast T1-Weighted Imaging as a Predictor of Periprocedural Myocardial Injury. JACC Cardiovasc Imaging 2014; 8:741-3. [PMID: 25457759 DOI: 10.1016/j.jcmg.2014.07.020] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 06/26/2014] [Accepted: 07/10/2014] [Indexed: 11/28/2022]
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Honda S, Asaumi Y, Yamane T, Nagai T, Miyagi T, Noguchi T, Anzai T, Goto Y, Ishihara M, Nishimura K, Ogawa H, Ishibashi-Ueda H, Yasuda S. Trends in the clinical and pathological characteristics of cardiac rupture in patients with acute myocardial infarction over 35 years. J Am Heart Assoc 2014; 3:e000984. [PMID: 25332178 PMCID: PMC4323797 DOI: 10.1161/jaha.114.000984] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Background There is little known about whether the clinical and pathological characteristics and incidence of cardiac rupture (CR) in patients with acute myocardial infarction (AMI) have changed over the years. Methods and Results The incidence and clinical characteristics of CR were investigated in patients with AMI, who were divided into 3 cohorts: 1977–1989, 1990–2000, and 2001–2011. Of a total of 5699 patients, 144 were diagnosed with CR and 45 survived. Over the years, the incidence of CR decreased (1977–1989, 3.3%; 1990–2000, 2.8%; 2001–2011, 1.7%; P=0.002) in association with the widespread adoption of reperfusion therapy. The mortality rate of CR decreased (1977–1989, 90%; 1990–2000, 56%; 2001–2011, 50%; P=0.002) in association with an increase in the rate of emergent surgery. In multivariable analysis, first myocardial infarction, anterior infarct, female sex, hypertension, and age >70 years were significant risk factors for CR, whereas impact of hypertension on CR was weaker from 2001 to 2011. Primary percutaneous coronary intervention (PPCI) was a significant protective factor against CR. In 64 autopsy cases with CR, myocardial hemorrhage occurred more frequently in those who underwent PPCI or fibrinolysis than those who did not receive reperfusion therapy (no reperfusion therapy, 18.0%; fibrinolysis, 71.4%; PPCI, 83.3%; P=0.001). Conclusions With the development of medical treatment, the incidence and mortality rate of CR have decreased. However, first myocardial infarction, anterior infarct, female sex, and old age remain important risk factors for CR. Adjunctive cardioprotection against reperfusion‐induced myocardial hemorrhage is emerging in the current PPCI era.
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Hirata K, Yagi N, Wake M, Takahashi T, Nakazato J, Miyagi T, Shimotakahara J. Coronary steal due to ruptured right coronary aneurysm causing myocardial infarction in a patient with systemic lupus erythematosus. Cardiovasc Diagn Ther 2014; 4:333-6. [PMID: 25276619 DOI: 10.3978/j.issn.2223-3652.2014.07.02] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2014] [Accepted: 06/24/2014] [Indexed: 11/14/2022]
Abstract
A 34-year-old female with a history of systemic lupus erythematosus (SLE) developed an acute inferior myocardial infarction while hospitalized for methicillin-resistant Staphylococcus Aureus sepsis. An emergent coronary angiography revealed an ectatic proximal left coronary artery and a huge aneurysm (37 mm × 32 mm) in the mid-portion of the right coronary artery, which had ruptured into the right atrium. A "steal phenomenon" due to significant left to right shunt resulting from the ruptured aneurysm was the cause of the myocardial infarction. Infection of the wall of the aneurysm might have contributed to the growth and the rupture in the presence of a pre-existing coronary aneurysm.
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Harada N, Hiramatsu N, Oze T, Morishita N, Yamada R, Hikita H, Miyazaki M, Yakushijin T, Miyagi T, Yoshida Y, Tatsumi T, Kanto T, Kasahara A, Oshita M, Mita E, Hagiwara H, Inui Y, Katayama K, Tamura S, Yoshihara H, Imai Y, Inoue A, Hayashi N, Takehara T. Risk factors for hepatocellular carcinoma in hepatitis C patients with normal alanine aminotransferase treated with pegylated interferon and ribavirin. J Viral Hepat 2014; 21:357-65. [PMID: 24716638 DOI: 10.1111/jvh.12151] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Accepted: 06/20/2013] [Indexed: 12/09/2022]
Abstract
Pegylated interferon (Peg-IFN) plus ribavirin combination therapy is effective in patients with hepatitis C virus (HCV) infection and normal alanine aminotransferase levels (NALT). However, it remains unclear whether the risk of hepatocellular carcinoma (HCC) incidence is actually reduced in virological responders. In this study, HCC incidence was examined for 809 patients with NALT (ALT ≤ 40 IU/mL) treated with Peg-IFN alpha-2b and ribavirin for a mean observation period of 36.2 ± 16.5 months. The risk factors for HCC incidence were analysed by Kaplan-Meier method and Cox proportional hazards model. On multivariate analysis among NALT patients, the risk of HCC incidence was significantly reduced in patients with sustained virological response (SVR) or relapse compared with those showing nonresponse (NR) (SVR vs NR, hazard ratio (HR): 0.16, P = 0.009, relapse vs NR, HR: 0.11, P = 0.037). Other risk factors were older age (≥65 years vs <60 years, HR: 6.0, P = 0.032, 60-64 vs <60 years, HR: 3.2, P = 0.212) and male gender (HR: 3.9, P = 0.031). Among 176 patients with PNALT (ALT ≤ 30 IU/mL), only one patient developed HCC and no significant risk factors associated with HCC development were found. In conclusion, antiviral therapy for NALT patients with HCV infection can lower the HCC incidence in responders, particularly for aged and male patients. The indication of antiviral therapy for PNALT (ALT ≤ 30 IU/mL) patients should be carefully determined.
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Moriyama N, Ishihara M, Noguchi T, Nakanishi M, Arakawa T, Asaumi Y, Kumasaka L, Kanaya T, Miyagi T, Nagai T, Yamane T, Fujino M, Honda S, Fujiwara R, Anzai T, Kusano K, Goto Y, Yasuda S, Ogawa H. Admission Hyperglycemia Is an Independent Predictor of Acute Kidney Injury in Patients With Acute Myocardial Infarction. Circ J 2014; 78:1475-80. [DOI: 10.1253/circj.cj-14-0117] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Honda S, Yasuda S, Yamane T, Adachi T, Nagai T, Miyagi T, Kotani J, Sakamoto H, Ishihara M, Ogawa H. Trend of decreased incidence and mortality of right ventricular infarction in association with increased use of reperfusion therapy; results from over 30-year database of acute myocardial infarction. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht307.p456] [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: 11/14/2022] Open
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Fujino A, Sakamoto H, Fujino M, Yamane T, Nagai T, Asaumi Y, Miyagi T, Ishihara M, Yasuda S, Ogawa H. Long-term survival benefit of revascularization for chronic total occlusions in patients with reduced left ventricular ejection fraction in comparison with medical treatment. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht310.p5323] [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: 11/12/2022] Open
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Miyagi T, Sakamoto H, Noguchi T, Fujita T, Anzai T, Shimizu W, Ishihara M, Kobayashi J, Ogawa H, Yasuda S. Vein graft vs. native coronary artery as the optimal target of percutaneous coronary intervention in patients with previous coronary artery bypass graft surgery. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht308.p2199] [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: 11/13/2022] Open
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63
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Fujino A, Sakamoto H, Fujino M, Yamane T, Nagai T, Asaumi Y, Miyagi T, Ishihara M, Yasuda S, Ogawa H. No added benefits of percutaneous coronary intervention over medical treatment in patients with chronic total occlusions. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht310.p5319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Honda S, Asaumi Y, Fujino M, Yamane T, Kumasaka R, Nagai T, Adachi T, Miyagi T, Arakawa T, Nakanishi M, Sakamoto H, Kotani J, Noguchi T, Goto Y, Anzai T, Shimizu W, Ishihara M, Ogawa H, Yasuda S. CHANGING INCIDENCE OF CARDIAC RUPTURE AND ITS DETERMINANTS IN PATIENTS WITH ACUTE MYOCARDIAL INFARCTION: RESULTS FROM 5,694 PATIENTS DATABASE OVER 35 YEARS. J Am Coll Cardiol 2013. [DOI: 10.1016/s0735-1097(13)60024-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Matsumoto M, Yasuda S, Yamane T, Adachi T, Miyagi T, Nagai T, Fujino M, Asaumi Y, Kumasaka R, Arakawa T, Kotani JI, Sakamoto H, Noguchi T, Goto Y, Yokoyama H, Anzai T, Shimizu W, Ishihara M, Nakatani T, Kobayashi J, Ogawa H. OVER 20-YEAR TREND OF IN-HOSPITAL MORTALITY IN PATIENTS WITH CARDIOGENIC SHOCK USING PERCUTANEOUS EXTRACORPOREAL MEMBRANE OXYGENATION: COMPARISON BETWEEN ACS AND NON-ACS PATIENTS. J Am Coll Cardiol 2013. [DOI: 10.1016/s0735-1097(13)60019-4] [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: 11/24/2022]
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Iseki K, Arima H, Kohagura K, Komiya I, Ueda S, Tokuyama K, Shiohira Y, Uehara H, Toma S, Tomiyama N, Arima H, Chinen S, Tokashiki K, Hirano-Nakasone A, Nohara C, Ueda S, Ueda S, Kohagura K, Toma S, Tana T, Higa A, Yamazato M, Ishida Y, Tokuyama K, Nagayoshi N, Miyagi S, Asato T, Kobayashi R, Shiohira Y, Yonaha T, Uezu Y, Kuwae N, Nakasato S, Oshiro Y, Nashiro K, Asato T, Katsuren H, Kagawa H, Naika-Geka K, Higa T, Ikema M, Akamine K, Nishihira M, Jahana M, Imai C, Yonaha T, Ikemura M, Uechi M, Yamazato M, Yoshihara K, Arakaki M, Iha K, Afuso H, Kiyuna S, Shiroma K, Miyara T, Itokazu M, Naka T, Naka S, Yamaguchi E, Uechi Y, Kowatari T, Yamada H, Yoshi S, Sunagawa H, Tozawa M, Uechi M, Adaniya M, Afuso H, Uehara H, Miyazato H, Sakuda C, Taminato T, Uchima H, Nakasone Y, Funakoshi T, Nakazato M, Nagata N, Miyazato S, Katsuren H, Miyagi T, Hirano H, Iwashiro K, Sunagawa T, Yoshida H, Oshiro Y, Shimabukuro T, Oura T, Henzan H, Kyan I, Maeshiro S, Wake T, Tagawa S, Inoue T, Tokashiki T, Ishii H, Miyagi S, Takishita S, Saito S, Shimizu K, Ohya Y, Barzi F. Effects of angiotensin receptor blockade (ARB) on mortality and cardiovascular outcomes in patients with long-term haemodialysis: a randomized controlled trial. Nephrol Dial Transplant 2013; 28:1579-89. [DOI: 10.1093/ndt/gfs590] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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67
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Hoshino K, Shibata D, Miyagi T, Yamamoto Y, Arakaki S, Maeshiro T, Hokama A, Kinjo F, Takahashi K, Fujita J. Cytomegalovirus-associated gastric ulcers in a patient with dermatomyositis treated with steroid and cyclophosphamide pulse therapy. Endoscopy 2012; 43 Suppl 2 UCTN:E277-8. [PMID: 21915824 DOI: 10.1055/s-0030-1256422] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Kawamura S, Sato I, Wada T, Yamaguchi K, Li Y, Li D, Zhao X, Ueno S, Aoki H, Tochigi T, Kuwahara M, Kitamura T, Takahashi K, Moriya S, Miyagi T. Plasma membrane-associated sialidase (NEU3) regulates progression of prostate cancer to androgen-independent growth through modulation of androgen receptor signaling. Cell Death Differ 2011; 19:170-9. [PMID: 21681193 DOI: 10.1038/cdd.2011.83] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Prostate cancers generally become androgen-independent and resistant to hormone therapy with progression. To understand the underlying mechanisms and facilitate the development of novel treatments for androgen-independent prostate cancer, we have investigated plasma membrane-associated sialidase (NEU3), the key enzyme for ganglioside hydrolysis participating in transmembrane signaling. We have discovered NEU3 to be upregulated in human prostate cancer compared with non-cancerous tissue, correlating with the Gleason score. NEU3 silencing with siRNA in prostate cancer PC-3 and LNCaP cells resulted in increased expression of differentiation markers and in cell apoptosis, but decrease in Bcl-2 as well as a progression-related transcription factor, early growth response gene (EGR-1). In androgen-sensitive LNCaP cells, forced overexpression of NEU3 significantly induced expression of EGR-1, androgen receptor (AR) and PSA both with and without androgen, the cells becoming sensitive to androgen. The NEU3-mediated induction was abrogated by inhibitors for PI-3 kinase and MAP kinase and more specifically by their silencing in the absence of androgen, being confirmed by increased phosphorylation of AKT and ERK1/2 in NEU3 overexpressing cells. NEU3 siRNA introduction caused reduction of cell growth of an androgen-independent PC-3 cells in culture and of transplanted tumors in nude mice. These data suggest that NEU3 regulates tumor progression through AR signaling, and thus be a potential tool for diagnosis and therapy of androgen-independent prostate cancer.
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Yamamoto M, Tatsumi T, Miyagi T, Tsunematsu H, Aketa H, Hosui A, Kanto T, Hiramatsu N, Hayashi N, Takehara T. α-Fetoprotein impairs activation of natural killer cells by inhibiting the function of dendritic cells. Clin Exp Immunol 2011; 165:211-9. [PMID: 21592114 DOI: 10.1111/j.1365-2249.2011.04421.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
α-Fetoprotein (AFP) is a tumour-associated antigen in hepatocellular carcinoma (HCC). The biological properties of AFP have been identified in its regulatory effects on immune responses of T cells and B cells. However, AFP effects on natural killer (NK) cells are still unclear. In this study, we examined the immunoregulation of AFP on NK activity. The cytolytic activity against K562 cells and Huh7 cells of NK cells co-cultured with AFP-treated dendritic cells (DCs) (AFP-DCs) was lower than that with albumin-treated DCs (Alb-DCs). Direct addition of AFP to NK cells did not alter the cytolytic activity of NK cells. Adding AFP inhibited the interleukin (IL)-12 production of DCs after stimulation with lipopolysaccharide (LPS) [Toll-like receptor (TLR)-4 ligand], or Poly(I:C) (TLR-3 ligand), but not IL-18 production. The mRNAs of IL-12p35 and IL-12p40 were significantly inhibited in AFP-DCs compared with Alb-DCs, but those of TLR-4 or TLR-3 were not. Transwell experiments revealed that soluble factors derived from DCs played roles in inhibition of the ability of activating NK cells by AFP-DCs. Adding the neutralizing antibody of IL-12 to NK cells co-cultured with Alb-DCs resulted in a decrease of cytolytic activity to the levels of NK cells co-cultured with AFP-DCs. Adding IL-12 to NK cells co-cultured with AFP-DCs resulted in an increase of cytolytic activity to the levels of NK cells co-cultured with Alb-DCs. These demonstrated that the impairment of IL-12 production from AFP-DCs resulted in inhibition of the ability of the activation of NK cells by DCs, and thus suggests a role of AFP in HCC development.
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Fujiyama N, Hasegawa T, Suda T, Yamamoto T, Miyagi T, Yamada K, Karen A. A beneficial application of backside SIMS for the depth profiling characterization of implanted silicon. SURF INTERFACE ANAL 2010. [DOI: 10.1002/sia.3646] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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71
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Yanagisawa H, Koshimura S, Miyagi T, Imamura F. Tsunami damage reduction performance of a mangrove forest in Banda Aceh, Indonesia inferred from field data and a numerical model. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jc005587] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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72
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Katoh S, Maeda S, Fukuoka H, Wada T, Moriya S, Mori A, Yamaguchi K, Senda S, Miyagi T. A crucial role of sialidase Neu1 in hyaluronan receptor function of CD44 in T helper type 2-mediated airway inflammation of murine acute asthmatic model. Clin Exp Immunol 2010; 161:233-41. [PMID: 20491786 DOI: 10.1111/j.1365-2249.2010.04165.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
CD44 is a highly glycosylated cell adhesion molecule that is involved in lymphocyte infiltration of inflamed tissues. We have demonstrated previously that sialic acid residues of CD44 negatively regulates its receptor function and CD44 plays an important role in the accumulation of T helper type 2 (Th2) cells in the airway of a murine model of acute asthma. Here we evaluated the role of sialidase in the hyaluronic acid (HA) receptor function of CD44 expressed on CD4+ T cells, as well as in the development of a mite antigen-induced murine model of acute asthma. Splenic CD4+ T cell binding of HA was examined with flow cytometry. Expression of sialidases (Neu1, Neu2, Neu3 and Neu4) in spleen cells was evaluated by quantitative real-time reverse transcription-polymerase chain reaction. Airway inflammation and airway hyperresponsiveness (AHR) were evaluated in the asthmatic Neu1-deficient mouse strain SM/J model. Splenic CD4+ T cells from asthmatic model mice displayed increased HA receptor activity of CD44 after culture with the antigen, along with characteristic parallel induction of sialidase (Neu1) expression. This induction of HA binding was suppressed significantly by a sialidase inhibitor and was not observed in SM/J mice. Th2 cytokine concentration and absolute number of Th2 cells in the bronchoalveolar lavage fluid, and AHR were decreased in SM/J mice. In conclusion, HA receptor activity of CD44 and acute asthmatic reactions, including Th2-mediated airway inflammation and AHR, are dependent upon Neu1 enzymatic activity. Our observation suggests that Neu1 may be a target molecule for the treatment of asthma.
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Inoue Y, Hiramatsu N, Oze T, Yakushijin T, Mochizuki K, Hagiwara H, Oshita M, Mita E, Fukui H, Inada M, Tamura S, Yoshihara H, Hayashi E, Inoue A, Imai Y, Kato M, Miyagi T, Hohsui A, Ishida H, Kiso S, Kanto T, Kasahara A, Takehara T, Hayashi N. Factors affecting efficacy in patients with genotype 2 chronic hepatitis C treated by pegylated interferon alpha-2b and ribavirin: reducing drug doses has no impact on rapid and sustained virological responses. J Viral Hepat 2010; 17:336-44. [PMID: 19678893 DOI: 10.1111/j.1365-2893.2009.01182.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Reducing the dose of drug affects treatment efficacy in pegylated interferon (Peg-IFN) and ribavirin combination therapy for patients with hepatitis C virus (HCV) genotype 1. The aim of this study was to investigate the impact of drug exposure, as well as the baseline factors and the virological response on the treatment efficacy for genotype 2 patients. Two-hundred and fifty patients with genotype 2 HCV who were to undergo combination therapy for 24 weeks were included in the study, and 213 completed the treatment. Significantly more patients who achieved a rapid virological response (RVR), defined as HCV RNA negativity at week 4, achieved a sustained virological response (SVR) (92%, 122/133) compared with patients who failed to achieve RVR (48%, 38/80) (P < 0.0001). Multivariate logistic-regression analysis showed that only platelet counts [odds ratio (OR), 1.68; confidence interval (CI), 1.002-1.139] and RVR (OR, 11.251; CI, 5.184-24.419) were independently associated with SVR, with no correlation being found for the mean dose of Peg-IFN and ribavirin for RVR and SVR. Furthermore, in the stratification analysis of the timing of viral clearance, neither mean dose of Peg-IFN (P = 0.795) nor ribavirin (P = 0.649) affected SVR in each group. Among the patients with RVR, the lowest dose group of Peg-IFN (0.77 +/- 0.10 microg/kg/week) and ribavirin (6.9 +/- 0.90 mg/kg/day) showed 100% and 94% of SVR. Hence, RVR served as an important treatment predictor, and drug exposure had no impact on both SVR and RVR in combination therapy for genotype 2 patients.
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Sheikh MA, Fujimura H, Miyagi T, Uechi Y, Yokota T, Yasumura S, Oomori T. Detection and ecological threats of PSII herbicide diuron on coral reefs around the Ryukyu Archipelago, Japan. MARINE POLLUTION BULLETIN 2009; 58:1922-1926. [PMID: 19837441 DOI: 10.1016/j.marpolbul.2009.09.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2009] [Revised: 09/09/2009] [Accepted: 09/09/2009] [Indexed: 05/28/2023]
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Tokutomi T, Miyagi T, Katsuki H, Takeuchi Y, Shigemori M. Cerebral oxygenation monitoring in critical care patients with traumatic brain injury. Crit Care 2009. [PMCID: PMC4083981 DOI: 10.1186/cc7259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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