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1.
Eur Heart J ; 43(14): 1416-1424, 2022 04 06.
Artigo em Inglês | MEDLINE | ID: mdl-34910136

RESUMO

AIMS: REVEAL was the first randomized controlled trial to demonstrate that adding cholesteryl ester transfer protein inhibitor therapy to intensive statin therapy reduced the risk of major coronary events. We now report results from extended follow-up beyond the scheduled study treatment period. METHODS AND RESULTS: A total of 30 449 adults with prior atherosclerotic vascular disease were randomly allocated to anacetrapib 100 mg daily or matching placebo, in addition to open-label atorvastatin therapy. After stopping the randomly allocated treatment, 26 129 survivors entered a post-trial follow-up period, blind to their original treatment allocation. The primary outcome was first post-randomization major coronary event (i.e. coronary death, myocardial infarction, or coronary revascularization) during the in-trial and post-trial treatment periods, with analysis by intention-to-treat. Allocation to anacetrapib conferred a 9% [95% confidence interval (CI) 3-15%; P = 0.004] proportional reduction in the incidence of major coronary events during the study treatment period (median 4.1 years). During extended follow-up (median 2.2 years), there was a further 20% (95% CI 10-29%; P < 0.001) reduction. Overall, there was a 12% (95% CI 7-17%, P < 0.001) proportional reduction in major coronary events during the overall follow-up period (median 6.3 years), corresponding to a 1.8% (95% CI 1.0-2.6%) absolute reduction. There were no significant effects on non-vascular mortality, site-specific cancer, or other serious adverse events. Morbidity follow-up was obtained for 25 784 (99%) participants. CONCLUSION: The beneficial effects of anacetrapib on major coronary events increased with longer follow-up, and no adverse effects emerged on non-vascular mortality or morbidity. These findings illustrate the importance of sufficiently long treatment and follow-up duration in randomized trials of lipid-modifying agents to assess their full benefits and potential harms. TRIAL REGISTRATION: International Standard Randomized Controlled Trial Number (ISRCTN) 48678192; ClinicalTrials.gov No. NCT01252953; EudraCT No. 2010-023467-18.


Assuntos
Aterosclerose , Infarto do Miocárdio , Oxazolidinonas , Adulto , Aterosclerose/tratamento farmacológico , Atorvastatina/uso terapêutico , Método Duplo-Cego , Humanos , Infarto do Miocárdio/tratamento farmacológico , Oxazolidinonas/efeitos adversos , Resultado do Tratamento
2.
J Small Anim Pract ; 62(5): 385-390, 2021 May.
Artigo em Inglês | MEDLINE | ID: mdl-33300156

RESUMO

OBJECTIVE: To determine the feasibility of three-dimensional conformal radiation therapy for canine aortic body tumours. MATERIALS AND METHODS: Medical records of dogs that had undergone three-dimensional conformal radiation therapy with presumptive diagnosis of aortic body tumour were reviewed for clinical characteristics, treatment modality and outcomes. RESULTS: Eight dogs were diagnosed with aortic body tumour and were treated with three-dimensional conformal radiation therapy. One dog had proliferation of a mass in the right atrium during treatment and died of respiratory distress. Another dog did not undergo follow-up CT to evaluate the treatment response due to the increased blood urea nitrogen values. The remaining 6 dogs were included in the case series. Radiotherapy was performed using a median dose per fraction of 7 Gy (3.3-7.14 Gy), a median of seven divided doses (7-15) and a total median dose of 49 Gy (45-50 Gy). The median number of CT scans during the follow-up period was 5 (range: 3-8 times). CT revealed acute side effects in four dogs-grade 1 effects related to the lung (n = 4) and skin (n = 2). Self-limiting or asymptomatic late side effects (grade 1 lung-related effect) were observed in three dogs. After therapy, one dog demonstrated a complete response, another demonstrated a partial response and the disease remained stable in four animals. The median follow-up period was 514.5 (235-1219) days. After three-dimensional conformal radiation therapy, the aortic body tumour reduced gradually over time without regrowth in all these 6 dogs. CLINICAL SIGNIFICANCE: In this small case series, aortic body tumours responded to three-dimensional conformal radiation therapy. Transient and self-limiting side effects of the treatments were common. Further controlled studies are required to prove the effectiveness and the safety of this intervention.


Assuntos
Doenças do Cão , Neoplasias , Radioterapia Conformacional , Animais , Corpos Aórticos , Doenças do Cão/radioterapia , Cães , Neoplasias/veterinária , Radioterapia Conformacional/veterinária , Estudos Retrospectivos
3.
Cytopathology ; 28(2): 116-121, 2017 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-27527114

RESUMO

OBJECTIVE: Biliary brush cytology is an important diagnostic tool in the evaluation of pancreatobiliary malignancies. However, it is difficult to distinguish between malignant and benign cells. The present study evaluated the utility of immunocytochemical expression of Claudin-18 and Maspin in brushing cytology specimens of pancreatobiliary lesions in the diagnosis of pancreatobiliary malignancies. METHODS: The study retrospectively assessed biliary and pancreatic duct brushing cytology specimens of 43 patients whose pancreatobiliary lesions were histologically diagnosed at the University of Miyazaki Hospital. Scanty cellularity slides and cases with no histological confirmation were excluded. Alcohol-fixed and Papanicolaou-stained slides were immunostained with monoclonal antibodies to Claudin-18 and Maspin. RESULTS: Of the 43 patients, 35 (81.4%) were finally histologically diagnosed with invasive adenocarcinomas. The sensitivity of routine cytology for the detection of malignancy was 63%, and the specificity was 100%. The sensitivity of cytology in combination with immunocytochemical expression of Claudin-18 (89%) or Claudin-18 and/or Maspin (97%) was significantly higher than that of cytology alone (P < 0.01). CONCLUSION: Immunocytochemical staining for Claudin-18 and Maspin improved the diagnostic sensitivity for pancreatobiliary adenocarcinomas.


Assuntos
Neoplasias dos Ductos Biliares/diagnóstico , Claudinas/metabolismo , Imuno-Histoquímica , Ductos Pancreáticos/patologia , Neoplasias Pancreáticas/diagnóstico , Serpinas/metabolismo , Adenocarcinoma/diagnóstico , Adenocarcinoma/patologia , Adulto , Idoso , Idoso de 80 Anos ou mais , Neoplasias dos Ductos Biliares/patologia , Feminino , Humanos , Imuno-Histoquímica/métodos , Hibridização in Situ Fluorescente/métodos , Masculino , Pessoa de Meia-Idade , Neoplasias Pancreáticas/patologia , Estudos Retrospectivos , Sensibilidade e Especificidade
4.
Cytopathology ; 28(3): 228-234, 2017 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-27995658

RESUMO

OBJECTIVE: Although microvascular proliferation is a key feature in the diagnosis of high-grade glioma, the characteristics of metastatic tumour vessels in smear preparations have not been documented. In this study, the vascular changes in metastatic brain tumours, using squash cytology to examine the vascular patterns in brain metastases, were reviewed. METHODS: One hundred and forty-three squash smears of brain tissue, including 25 normal or reactive tissue, 23 malignant lymphomas, 8 grade I glioma (pilocytic astrocytoma), 23 grade II glioma (diffuse astrocytoma and oligodendroglioma), 42 grade IV glioma (glioblastoma), and 22 metastasis, were assessed. Two vascular patterns were assessed: thick and branching, and glomeruloid. The vessel density, nuclear layer and the number of vessel branches were compared. Furthermore, tumour vessels of brain metastases were analysed by histology and for immunohistochemical expression of CD34, α-smooth muscle actin (SMA) and high-molecular-weight caldesmon (h-CD). RESULTS: Among 22 metastatic tumours, thick and branching vessels were found in 17 (77%) and glomeruloid vessels in 13 (59%). These incidences of microvascular proliferation patterns were similar to those of glioblastomas or pilocytic astrocytomas. Vessel density, nuclear layer and vessel wall branches were significantly higher in metastatic tumours than malignant lymphomas, grade II gliomas or normal brain tissues. Glomeruloid vessels consisted of CD34-positive cells and α-SMA-positive cells, and α-SMA-positive cells had a low h-CD expression. These immunohistochemical patterns were similar to those of high-grade gliomas. CONCLUSIONS: The vascular features of metastatic brain tumours are similar to those of glioblastomas, suggesting that these microvascular proliferations contribute to the progression of metastatic tumours.


Assuntos
Neoplasias Encefálicas/patologia , Proliferação de Células/fisiologia , Glioblastoma/patologia , Microvasos/patologia , Actinas/metabolismo , Antígenos CD34/metabolismo , Astrocitoma/metabolismo , Astrocitoma/patologia , Encéfalo/metabolismo , Encéfalo/patologia , Neoplasias Encefálicas/metabolismo , Citodiagnóstico/métodos , Feminino , Glioblastoma/metabolismo , Glioma/metabolismo , Glioma/patologia , Humanos , Masculino , Pessoa de Meia-Idade , Oligodendroglioma/metabolismo , Oligodendroglioma/patologia
5.
Sci Rep ; 6: 33228, 2016 09 14.
Artigo em Inglês | MEDLINE | ID: mdl-27624220

RESUMO

Structural materials used for safety critical applications require high strength and simultaneously high resistance against crack growth, referred to as damage tolerance. However, the two properties typically exclude each other and research efforts towards ever stronger materials are hampered by drastic loss of fracture resistance. Therefore, future development of novel ultra-strong bulk materials requires a fundamental understanding of the toughness determining mechanisms. As model material we use today's strongest metallic bulk material, namely, a nanostructured pearlitic steel wire, and measured the fracture toughness on micron-sized specimens in different crack growth directions and found an unexpected strong anisotropy in the fracture resistance. Along the wire axis the material reveals ultra-high strength combined with so far unprecedented damage tolerance. We attribute this excellent property combination to the anisotropy in the fracture toughness inducing a high propensity for micro-crack formation parallel to the wire axis. This effect causes a local crack tip stress relaxation and enables the high fracture toughness without being detrimental to the material's strength.

6.
Cell Death Discov ; 1: 15051, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-27551480

RESUMO

We previously demonstrated PAR2 starts upstreamed with tissue factor (TF) and factor VII (FVII), inhibited autophagy via mTOR signaling in HCC. However, the mechanism underlying for merging functions of PAR2 with the coagulation system in HCC progression remained unclear. The present study aimed to investigate the role of TF, FVII and PAR2 in tumor progression of HCC. The expressions of TF, FVII and PAR2 from HCC specimens were evaluated by immunohistochemical stains and western blotting. We found that the expression of FVII, but not TF and PAR2, directly related to the vascular invasion and the clinical staging. Importantly, a lower level of FVII expression was significantly associated with the longer disease-free survival. The addition of FVII but not TF induced the expression of PAR2 and phosphorylation of ERK1/2, whereas knockdown of FVII decreased PAR2 expression and ERK1/2 phosphorylation in HCC cell lines. Furthermore, levels of phosphor-TSC2 (Ser664) were increased after treatment with FVII and PAR2 agonist whereas these were significantly abolished in the presence of a potent and specific MEK/ERK inhibitor U0126. Moreover, mTOR knockdown highly reduced Hep3B migration, which could be reverted by FVII but not TF and PAR2. These results indicated that FVII/PAR2 signaling through MEK/ERK and TSC2 axis for mTOR activation has potent effects on the migration of HCC cells. In addition, FVII/PAR2 signaling elicits an mTOR-independent signaling, which promotes hepatoma cell migration in consistent with the clinical observations. Our study indicates that levels of FVII, but not TF, are associated with tumor migration and invasiveness in HCC, and provides clues that evaluation of FVII expression in HCC may be useful as a prognostic indicator in patients with HCC and may form an alternative target for further therapy.

7.
Hernia ; 19(4): 595-8, 2015 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-25367201

RESUMO

PURPOSE: The current study aimed to verify the usefulness of preoperative ultrasonographic evaluation of contralateral patent processus vaginalis (PPV) at the level of the internal inguinal ring. METHODS: This was a prospective study of patients undergoing unilateral inguinal hernia repair at two institutions during 2010-2011. The sex, age at initial operation, birth weight, initial operation side, and the preoperative diameter of the contralateral PPV as determined using ultrasonography (US) were recorded. We analyzed the incidence of contralateral inguinal hernia, risk factors, and the usefulness of the preoperative major diameter of the contralateral PPV. The follow-up period was 36 months. RESULTS: All 105 patients who underwent unilateral hernia repair completed 36 months of follow-up, during which 11 patients (10.5 %) developed a contralateral hernia. The following covariates were not associated with contralateral hernia development: sex (p = 0.350), age (p = 0.185), birth weight (p = 0.939), and initial operation side (p = 0.350). The preoperative major diameter of the contralateral PPV determined using US was significantly wider among patients with a contralateral hernia than those without a contralateral hernia (p = 0.001). When the 105 patients were divided into two groups according to cut-off values of the preoperative major diameter of the contralateral PPV (wide group, >2.0 mm; narrow group, ≤2.0 mm), a significant association was observed between the preoperative major diameter of the contralateral PPV and patient outcomes (p = 0.001). CONCLUSIONS: We used US and confirmed the usefulness of a preoperative evaluation of the major diameter of the contralateral PPV at the level of the internal inguinal ring in pediatric patients with unilateral inguinal hernias.


Assuntos
Hérnia Inguinal/diagnóstico por imagem , Canal Inguinal/diagnóstico por imagem , Adolescente , Criança , Pré-Escolar , Feminino , Hérnia Inguinal/cirurgia , Humanos , Incidência , Lactente , Recém-Nascido , Masculino , Valor Preditivo dos Testes , Cuidados Pré-Operatórios , Estudos Prospectivos , Fatores de Risco , Ultrassonografia
8.
Int J Oral Maxillofac Surg ; 44(2): 259-66, 2015 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-25457826

RESUMO

The aim of this study was to investigate the 3-year morbidity of coronectomy of the lower third molar and to monitor the behaviour and migration pattern of the retained roots postoperatively. A total of 92 patients (111 teeth) who had undergone a coronectomy between October 2005 and July 2009 were investigated. Patients were followed up at 3 months and 1, 2, and 3 years for clinical evaluation and dental computed tomography imaging of the coronectomy sites. In total, 10 cases (9%) required tooth root extraction within the 3 years after coronectomy. In seven of them, the distal pocket of the lower second molars remained connected to the roots within the first year. Of the cases in whom a pocket did not remain at an early stage, none showed peri-apical lesions on transmission images of the retained roots in the apical area, which usually result from necrosis of the pulp. Root migration increased in the first 2 years after coronectomy but stabilized between the second and third years. In addition, a significant difference was noted in root migration between patients of different ages and sex. Retained roots after coronectomy in the lower third molars led to no complications in terms of infection or the development of pathologies within the first 3 years postoperatively.


Assuntos
Dente Serotino/cirurgia , Coroa do Dente/cirurgia , Adulto , Feminino , Seguimentos , Humanos , Masculino , Mandíbula , Dente Serotino/diagnóstico por imagem , Tomografia Computadorizada por Raios X , Coroa do Dente/diagnóstico por imagem , Extração Dentária , Migração de Dente/etiologia , Raiz Dentária/diagnóstico por imagem , Raiz Dentária/cirurgia , Resultado do Tratamento
9.
Cell Death Dis ; 5: e1244, 2014 May 22.
Artigo em Inglês | MEDLINE | ID: mdl-24853422

RESUMO

Autophagy has an important role in tumor biology of hepatocellular carcinoma (HCC). Recent studies demonstrated that tissue factor (TF) combined with coagulation factor VII (FVII) has a pathological role by activating a G-protein-coupled receptor called protease-activated receptor 2 (PAR2) for tumor growth. The present study aimed to investigate the interactions of autophagy and the coagulation cascade in HCC. Seventy HCC patients who underwent curative liver resection were recruited. Immunohistochemical staining and western blotting were performed to determine TF, FVII, PAR2 and light chain 3 (LC3A/B) expressions in tumors and their contiguous normal regions. We found that the levels of autophagic marker LC3A/B-II and coagulation proteins (TF, FVII and PAR2) were inversely correlated in human HCC tissues. Treatments with TF, FVII or PAR2 agonist downregulated LC3A/B-II with an increased level of mTOR in Hep3B cells; in contrast, knockdown of TF, FVII or PAR2 increased LC3A/B. Furthermore, mTOR silencing restored the impaired expression of LC3A/B-II in TF-, FVII- or PAR2-treated Hep3B cells and activated autophagy. Last, as an in vivo correlate, we administered TF, FVII or PAR2 agonist in a NOD/severe combined immunodeficiency xenograft model and showed decreased LC3A/B protein levels in HepG2 tumors with treatments. Overall, our present study demonstrated that TF, FVII and PAR2 regulated autophagy mainly via mTOR signaling. The interaction of coagulation and autophagic pathways may provide potential targets for further therapeutic application in HCC.


Assuntos
Autofagia , Coagulação Sanguínea , Carcinoma Hepatocelular/sangue , Carcinoma Hepatocelular/patologia , Neoplasias Hepáticas/sangue , Neoplasias Hepáticas/patologia , Animais , Antineoplásicos/farmacologia , Autofagia/efeitos dos fármacos , Carcinoma Hepatocelular/tratamento farmacológico , Carcinoma Hepatocelular/genética , Proliferação de Células , Fator VII/administração & dosagem , Fator VII/genética , Fator VII/metabolismo , Células Hep G2 , Humanos , Neoplasias Hepáticas/tratamento farmacológico , Neoplasias Hepáticas/genética , Camundongos , Camundongos Endogâmicos NOD , Camundongos SCID , Proteínas Associadas aos Microtúbulos/genética , Proteínas Associadas aos Microtúbulos/metabolismo , Oligopeptídeos/farmacologia , Interferência de RNA , Receptor PAR-2/agonistas , Receptor PAR-2/genética , Receptor PAR-2/metabolismo , Transdução de Sinais , Serina-Treonina Quinases TOR/genética , Serina-Treonina Quinases TOR/metabolismo , Tromboplastina/administração & dosagem , Tromboplastina/genética , Tromboplastina/metabolismo , Fatores de Tempo , Transfecção , Carga Tumoral , Ensaios Antitumorais Modelo de Xenoenxerto
10.
Transplant Proc ; 46(4): 1198-200, 2014 May.
Artigo em Inglês | MEDLINE | ID: mdl-24815159

RESUMO

Adipose-derived mesenchymal stem cells (ASCs) have been considered to be attractive and readily available adult mesenchymal stem cells (MSCs) and are becoming increasingly popular for use in regenerating cell therapy. However, recent evidence attributed a fibrotic potential to MSCs which differentiated into myofibroblasts with highly increased α-smooth muscle actin (α-SMA) expression while transplanted into an injured/regenerating liver in mice. In this study, we studied the role of miR-27b in ASCs and their regenerative potential after partial liver resection in rats. ASCs transfected with control siRNA or miR-27b were intravenously injected into autologous rats undergoing 70% partial hepatectomy (PH). Our data showed that the regenerative capacities of ASCs with overexpressed miR-27b were significantly higher compared with control ASCs. However, the enhanced regeneration, hepatic differentiation, and suppressed liver inflammation, as well as fibrotic activity, were significantly reverted by ZnPP coadministration (heme oxygenase-1 [HO-1] inhibitor) indicating an important role of HO-1 in the regenerating and cytoprotective activities of miR-27b-transfected ASCs. We demonstrated that administration of autologous ASCs overexpressed with miR-27b enhances rapid and early liver regeneration and, importantly, preserves function after PH. The ASCs with miR-27b overexpression might offer a viable therapeutic option to facilitate rapid recovery after liver resection.


Assuntos
Tecido Adiposo/transplante , Proliferação de Células , Heme Oxigenase (Desciclizante)/metabolismo , Regeneração Hepática , Fígado/enzimologia , Transplante de Células-Tronco Mesenquimais , Células-Tronco Mesenquimais/metabolismo , MicroRNAs/metabolismo , Tecido Adiposo/citologia , Tecido Adiposo/imunologia , Tecido Adiposo/metabolismo , Animais , Proliferação de Células/efeitos dos fármacos , Células Cultivadas , Inibidores Enzimáticos/farmacologia , Feminino , Regulação Enzimológica da Expressão Gênica , Heme Oxigenase (Desciclizante)/antagonistas & inibidores , Heme Oxigenase (Desciclizante)/genética , Hepatectomia , Hepatite/enzimologia , Hepatite/patologia , Hepatite/prevenção & controle , Fígado/efeitos dos fármacos , Fígado/imunologia , Fígado/patologia , Cirrose Hepática/enzimologia , Cirrose Hepática/patologia , Cirrose Hepática/prevenção & controle , Regeneração Hepática/efeitos dos fármacos , Masculino , Células-Tronco Mesenquimais/imunologia , MicroRNAs/genética , Modelos Animais , Interferência de RNA , Ratos Endogâmicos Lew , Fatores de Tempo , Transfecção
11.
Transplant Proc ; 46(3): 894-6, 2014 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-24767374

RESUMO

Orthotopic liver transplantation (OLT) is the gold standard procedure for treating end-stage liver disease resulting from a variety of causes. Psychiatric comorbidities are common problems among patients who have undergone OLT; however, the association between psychiatric comorbidity and biological factors in OLT has not been investigated. In our previous study, we found a positive correlation between serum C-reactive protein (CRP) level after OLT and the prevalence of psychiatric comorbidities in recipients. In this retrospective cohort analysis, we enrolled 279 recipients who underwent OLT during a 3-year period (from 2008 to 2011) at a single center. Our retrospective study showed that the recipients with a higher serum CRP level at 1 month after OLT had higher psychiatric comorbidities compared with the recipients with a normal serum CRP level. Additionally, an in vitro study demonstrated that the down-regulation of brain-derived neurotrophic factor (BDNF) gene expression by CRP treatment in retinoic acid (RA) differentiated SH-SY5Y neuroblastoma cells. These clinical and experimental results indicated that the overexpression of CRP may induce psychiatric comorbidities through suppressed expression of the BDNF, suggesting that OLT recipients who developed psychiatric comorbidities might be accompanied by an immunological or acute-phase protein response. In conclusion, an activation of systemic inflammatory processes may be one of the predictable signatures for psychiatric comorbidities in OLT recipients.


Assuntos
Proteína C-Reativa/metabolismo , Transplante de Fígado/efeitos adversos , Transtornos Mentais/etiologia , Fator Neurotrófico Derivado do Encéfalo/genética , Linhagem Celular Tumoral , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos
12.
Hernia ; 18(3): 333-7, 2014 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-23644774

RESUMO

PURPOSE: Previously, we established a pre-operative risk scoring system to predict contralateral inguinal hernia in children with unilateral inguinal hernias. The current study aimed to verify the usefulness of our pre-operative scoring system. METHODS: This was a prospective study of patients undergoing unilateral inguinal hernia repair from 2006 to 2009 at a single institution. Gender, age at initial operation, birth weight, initial operation side, and the pre-operative risk score were recorded. We analyzed the incidence of contralateral inguinal hernia, risk factors, and the usefulness of our pre-operative risk scoring system. The follow-up period was 36 months. We used forward multiple logistic regression analysis to predict contralateral hernia. RESULTS: Of the 372 patients who underwent unilateral hernia repair, 357 (96.0 %) were completely followed-up for 36 months, and 23 patients (6.4 %) developed a contralateral hernia. Left-sided hernia (OR = 5.5, 95 %, CI = 1.3-24.3, p = 0.023) was associated with an increased risk of contralateral hernia. The following covariates were not associated with contralateral hernia development: gender (p = 0.702), age (p = 0.215), and birth weight (p = 0.301). The pre-operative risk score (cut-off point = 4.5) of the patients with a contralateral hernia was significantly higher, compared with the patients without a contralateral hernia using the area under the receiver operating characteristic curve (p = 0.024). CONCLUSIONS: Using multivariate analysis, we confirmed usefulness of our pre-operative scoring system and initial side of the inguinal hernia, together, for the prediction of contralateral inguinal hernia in children.


Assuntos
Hérnia Inguinal/epidemiologia , Adolescente , Criança , Pré-Escolar , Feminino , Indicadores Básicos de Saúde , Hérnia Inguinal/diagnóstico , Hérnia Inguinal/cirurgia , Humanos , Incidência , Lactente , Recém-Nascido , Masculino , Análise Multivariada , Estudos Prospectivos , Fatores de Risco , Tóquio/epidemiologia
14.
J Synchrotron Radiat ; 20(Pt 2): 219-25, 2013 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-23412477

RESUMO

A Si(111) winged crystal has been designed to minimize anticlastic bending and improve sagittal focusing efficiency. The crystal was thin with wide stiffening wings. The length-to-width ratio of the crystal was optimized by finite element analysis, and the optimal value was larger than the `golden value'. The analysis showed that the slope error owing to anticlastic bending is less than the Darwin width. The X-rays were focused two-dimensionally using the crystal and a tangentially bent mirror. The observed profiles of the focal spot agreed well with the results of a ray-tracing calculation in the energy range from 8 to 17.5 keV. X-ray diffraction measurements with a high signal-to-noise ratio using this focusing system were demonstrated for a small protein crystal.


Assuntos
Muramidase/química , Difração de Raios X/métodos , Animais , Cristalização/instrumentação , Desenho de Equipamento , Síncrotrons
15.
Ultramicroscopy ; 132: 233-8, 2013 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-23237772

RESUMO

A local electrode atom probe has been employed to analyze the redistribution of alloying elements including Si, Mn, and Cr in pearlitic steel wires upon cold-drawing and subsequent annealing. It has been found that the three elements undergo mechanical mixing upon cold-drawing at large strains, where Mn and Cr exhibit a nearly homogeneous distribution throughout both ferrite and cementite, whereas Si only dissolves slightly in cementite. Annealing at elevated temperatures leads to a reversion of the mechanical alloying. Si atoms mainly segregate at well-defined ferrite (sub)grain boundaries formed during annealing. Cr and Mn are strongly concentrated in cementite adjacent to the ferrite/cementite interface due to their lower diffusivities in cementite than in ferrite.

16.
Eur J Vasc Endovasc Surg ; 44(3): 287-92, 2012 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-22824348

RESUMO

OBJECTIVE: To determine whether statin therapy reduces the growth rate of small abdominal aortic aneurysms (AAAs). DESIGN: A meta-analysis and a meta-regression of comparative studies. MATERIALS: Eligible studies were randomized controlled trials or observational comparative studies of statin therapy versus placebo or no statin, enrolling individuals with small (<55 mm in diameter) AAAs and reporting AAA growth rate as an outcome. METHODS: Study-specific estimates (standardized mean differences [SMDs]) were combined in the fixed- and random-effects model. RESULTS: Seven adjusted and 4 unadjusted observational comparative studies enrolling 4647 patients with a small AAA were identified. Pooled analysis of all 11 studies suggested a significant reduction in AAA growth rate among patients assigned to statin therapy versus no statin (SMD, -0.420; 95% confidence interval [CI], -0.651 to -0.189). Combining the 7 high-quality studies providing adjusted data for growth rates generated an attenuated but still statistically significant result favoring statin therapy (SMD, -0.367; 95% CI, -0.566 to -0.168). The meta-regression coefficient for the baseline diameter was statistically significant (-0.096; 95% CI, -0.132 to -0.061). CONCLUSION: Statin therapy is likely effective in prevention of the growth of small AAAs, and may be more beneficial as the baseline diameter increases.


Assuntos
Aneurisma da Aorta Abdominal/prevenção & controle , Inibidores de Hidroximetilglutaril-CoA Redutases/uso terapêutico , Aneurisma da Aorta Abdominal/patologia , Progressão da Doença , Humanos , Prognóstico , Fatores de Tempo
17.
J Dent Res ; 91(8): 771-6, 2012 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-22674934

RESUMO

In osteoprotegerin-deficient (OPG-/-) mice, osteoclast activity causes bone resorption to outpace bone formation, leading to the development of severe osteoporosis. Such mice are therefore useful for investigating the alveolar bone of patients with osteoporosis. Reveromycin A (RM-A) was recently identified as the unique agent acting on osteoclast activation. This study aimed to analyze the effect of RM-A on the orthodontic treatment of OPG-/- mice (a model of osteoporosis patients with high levels of bone turnover). We examined alveolar bone remodeling in OPG-/- and wild-type (WT) mice during continuous tooth movement. The orthodontic force was induced by means of a Ni-Ti closed-coil spring to move the maxillary first molar for 14 days. RM-A sodium salt (1 mg/kg) was administered intraperitoneally twice daily. In OPG-/- mice, the tooth movement distance was longer, alveolar bone resorption was enhanced, the osteoclast count was greater, and serum alkaline phosphatase and tartrate-resistant acid phosphatase levels were higher relative to those in WT mice. However, the administration of RM-A in OPG-/- mice reduced these parameters. We conclude that RM-A normalizes bone metabolism and loss of alveolar bone during continuous tooth movement in OPG-/- mice.


Assuntos
Processo Alveolar/efeitos dos fármacos , Conservadores da Densidade Óssea/farmacologia , Remodelação Óssea/efeitos dos fármacos , Piranos/farmacologia , Compostos de Espiro/farmacologia , Técnicas de Movimentação Dentária , Fosfatase Ácida/sangue , Fosfatase Alcalina/sangue , Processo Alveolar/patologia , Animais , Biomarcadores/sangue , Conservadores da Densidade Óssea/administração & dosagem , Reabsorção Óssea/patologia , Reabsorção Óssea/fisiopatologia , Contagem de Células , Ligas Dentárias/química , Modelos Animais de Doenças , Injeções Intraperitoneais , Isoenzimas/sangue , Masculino , Maxila/efeitos dos fármacos , Maxila/patologia , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Endogâmicos , Camundongos Knockout , Mutação/genética , Níquel/química , Fios Ortodônticos , Osteíte Deformante/genética , Osteíte Deformante/fisiopatologia , Osteoclastos/efeitos dos fármacos , Osteoclastos/patologia , Osteoporose/genética , Osteoporose/fisiopatologia , Osteoprotegerina/genética , Piranos/administração & dosagem , Compostos de Espiro/administração & dosagem , Fosfatase Ácida Resistente a Tartarato , Titânio/química , Microtomografia por Raio-X
18.
Cell Death Differ ; 19(4): 573-81, 2012 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-21959934

RESUMO

The programmed cell death 4 (Pdcd4), a translation inhibitor, plays an essential role in tumor suppression, but its role in apoptosis remains unclear. Here we show that Pdcd4 is a critical suppressor of apoptosis by inhibiting the translation of procaspase-3 mRNA. Pdcd4 protein decreased more rapidly through microRNA-mediated translational repression following apoptotic stimuli than did the activation of procaspase-3, cleavage of poly(ADP)ribose polymerase (PARP) by active caspase-3, and nuclear fragmentation. Strikingly, the loss of Pdcd4 by the specific RNA interference increased procaspase-3 expression, leading to its activation and PARP cleavage even without apoptotic stimuli, and sensitized the cells to apoptosis. Thus, our findings provide insight into a novel mechanism for Pdcd4 as a regulator of apoptosis.


Assuntos
Proteínas Reguladoras de Apoptose/metabolismo , Apoptose/fisiologia , Caspase 3/biossíntese , Regulação Enzimológica da Expressão Gênica/fisiologia , Biossíntese de Proteínas/fisiologia , Proteínas de Ligação a RNA/metabolismo , Proteínas Reguladoras de Apoptose/genética , Caspase 3/genética , Células HeLa , Humanos , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Proteínas de Ligação a RNA/genética
19.
Ultramicroscopy ; 111(6): 628-32, 2011 May.
Artigo em Inglês | MEDLINE | ID: mdl-21146309

RESUMO

Atom Probe Tomography (APT) was used to analyze the carbon distribution in a heavily cold drawn pearlitic steel wire with a true strain of 6.02. The carbon concentrations in cementite and ferrite were separately measured by a sub-volume method and compared with the literature data. It is found that the carbon concentration in ferrite saturates with strain. The carbon concentration in cementite decreases with the lamellar thickness, while the carbon atoms segregate at dislocations or cell/grain boundaries in ferrite. The mechanism of cementite decomposition is discussed in terms of the evolution of dislocation structure during severe plastic deformation.

20.
J Thromb Haemost ; 9(1): 201-8, 2011 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-21029360

RESUMO

BACKGROUND: High plasma levels of C-reactive protein (CRP) constitute a powerful predictive marker of cardiovascular events. Several lines of evidence suggest that CRP has prothrombogenic effects. However, whether CRP directly participates in the pathogenesis of thrombosis in vivo has not been fully clarified. OBJECTIVE: To test whether human CRP (hCRP) affects arterial thrombus formation after balloon injury of smooth muscle cell (SMC)-rich or macrophage-rich neointima. METHODS: We compared the susceptibility of transgenic (Tg) rabbits expressing hCRP (46.21 ± 13.85 mg L(-1), n = 22) and non-Tg rabbits to arterial thrombus formation after balloon injury of SMC-rich or macrophage-rich neointima. RESULTS: Thrombus size on SMC-rich or macrophage-rich neointima was significantly increased, and was accompanied by an increase in fibrin content in hCRP-Tg rabbits, as compared with non-Tg rabbits. Thrombus size did not significantly differ between SMC-rich and macrophage-rich neointima in hCRP-Tg rabbits. Tissue factor (TF) mRNA expression and activity in these neointimal lesions were significantly increased in hCRP-Tg rabbits as compared with non-Tg rabbits. The degree of CRP deposition correlated with the elevated TF expression and thrombus size on injured neointima. In addition, hCRP isolated from hCRP-Tg rabbit plasma induced TF mRNA expression and activity in rabbit cultured vascular SMCs. CONCLUSIONS: These results suggest that elevated plasma hCRP levels promote thrombus formation on injured SMC-rich neointima by enhancing TF expression, but have no additive effects in macrophage-rich neointima.


Assuntos
Proteína C-Reativa/metabolismo , Artéria Femoral/metabolismo , Músculo Liso Vascular/metabolismo , Miócitos de Músculo Liso/metabolismo , Trombose/genética , Túnica Íntima/metabolismo , Lesões do Sistema Vascular/metabolismo , Animais , Animais Geneticamente Modificados , Proteína C-Reativa/genética , Cateterismo , Proliferação de Células , Células Cultivadas , Modelos Animais de Doenças , Artéria Femoral/lesões , Artéria Femoral/patologia , Humanos , Hiperlipidemias/genética , Hiperlipidemias/metabolismo , Macrófagos/metabolismo , Masculino , Músculo Liso Vascular/lesões , Músculo Liso Vascular/patologia , Miócitos de Músculo Liso/patologia , RNA Mensageiro/metabolismo , Coelhos , Tromboplastina/genética , Trombose/sangue , Trombose/metabolismo , Trombose/patologia , Fatores de Tempo , Túnica Íntima/lesões , Túnica Íntima/patologia , Regulação para Cima , Lesões do Sistema Vascular/sangue , Lesões do Sistema Vascular/genética , Lesões do Sistema Vascular/patologia
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