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1.
Phys Rev Lett ; 131(20): 201802, 2023 Nov 17.
Artigo em Inglês | MEDLINE | ID: mdl-38039466

RESUMO

We search for energetic electron recoil signals induced by boosted dark matter (BDM) from the galactic center using the COSINE-100 array of NaI(Tl) crystal detectors at the Yangyang Underground Laboratory. The signal would be an excess of events with energies above 4 MeV over the well-understood background. Because no excess of events are observed in a 97.7 kg·yr exposure, we set limits on BDM interactions under a variety of hypotheses. Notably, we explored the dark photon parameter space, leading to competitive limits compared to direct dark photon search experiments, particularly for dark photon masses below 4 MeV and considering the invisible decay mode. Furthermore, by comparing our results with a previous BDM search conducted by the Super-Kamionkande experiment, we found that the COSINE-100 detector has advantages in searching for low-mass dark matter. This analysis demonstrates the potential of the COSINE-100 detector to search for MeV electron recoil signals produced by the dark sector particle interactions.

2.
Eye (Lond) ; 31(1): 119-126, 2017 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-27662466

RESUMO

PurposeTo evaluate a progression-detecting algorithm for a new automated matched alternation flicker (AMAF) in glaucoma patients.MethodsOpen-angle glaucoma patients with a baseline mean deviation of visual field (VF) test>-6 dB were included in this longitudinal and retrospective study. Functional progression was detected by two VF progression criteria and structural progression by both AMAF and conventional comparison methods using optic disc and retinal nerve fiber layer (RNFL) photography. Progression-detecting performances of AMAF and the conventional method were evaluated by an agreement between functional and structural progression criteria. RNFL thickness changes measured by optical coherence tomography (OCT) were compared between progressing and stable eyes determined by each method.ResultsAmong 103 eyes, 47 (45.6%), 21 (20.4%), and 32 (31.1%) eyes were evaluated as glaucoma progression using AMAF, the conventional method, and guided progression analysis (GPA) of the VF test, respectively. The AMAF showed better agreement than the conventional method, using GPA of the VF test (κ=0.337; P<0.001 and κ=0.124; P=0.191, respectively). The rates of RNFL thickness decay using OCT were significantly different between the progressing and stable eyes when progression was determined by AMAF (-3.49±2.86 µm per year vs -1.83±3.22 µm per year; P=0.007) but not by the conventional method (-3.24±2.42 µm per year vs -2.42±3.33 µm per year; P=0.290).ConclusionsThe AMAF was better than the conventional comparison method in discriminating structural changes during glaucoma progression, and showed a moderate agreement with functional progression criteria.


Assuntos
Técnicas de Diagnóstico Oftalmológico , Glaucoma de Ângulo Aberto/diagnóstico , Fibras Nervosas/patologia , Disco Óptico/patologia , Doenças do Nervo Óptico/diagnóstico , Fotografação/métodos , Adulto , Idoso , Algoritmos , Progressão da Doença , Feminino , Glaucoma de Ângulo Aberto/fisiopatologia , Humanos , Masculino , Pessoa de Meia-Idade , Disco Óptico/diagnóstico por imagem , Disco Óptico/fisiopatologia , Retina/diagnóstico por imagem , Estudos Retrospectivos , Tomografia de Coerência Óptica/métodos , Campos Visuais/fisiologia , Adulto Jovem
3.
Br J Cancer ; 107(1): 91-9, 2012 Jun 26.
Artigo em Inglês | MEDLINE | ID: mdl-22644307

RESUMO

BACKGROUND: The purpose of this study was to identify genes that are differentially expressed in chemosensitive serous papillary ovarian carcinomas relative to those expressed in chemoresistant tumours. METHODS: To identify novel candidate biomarkers, differences in gene expression were analysed in 26 stage IIIC/IV serous ovarian adenocarcinomas (12 chemosensitive tumours and 14 chemoresistant tumours). We subsequently investigated the immunohistochemical expression of GRIA2 in 48 independent sets of advanced ovarian serous carcinomas. RESULTS: Microarray analysis revealed a total of 57 genes that were differentially expressed in chemoresistant and chemosensitive tumours. Of the 57 genes, 39 genes were upregulated and 18 genes were downregulated in chemosensitive tumours. Five differentially expressed genes (CD36, LIFR, CHL1, GRIA2, and FCGBP) were validated by quantitative real-time PCR. The expression of GRIA2 was validated at the protein level by immunohistochemistry, and patients with GRIA2 expression showed a longer progression-free and overall survival (P=0.051 and P=0.031 respectively). CONCLUSIONS: We found 57 differentially expressed genes to distinguish between chemosensitive and chemoresistant tumours. We also demonstrated that the expression of GRIA2 among the differentially expressed genes provides better prognosis of patients with advanced serous papillary ovarian adenocarcinoma.


Assuntos
Cistadenocarcinoma Seroso/genética , Neoplasias Epiteliais e Glandulares/genética , Neoplasias Ovarianas/genética , Receptores de AMPA/genética , Adulto , Idoso , Carcinoma Epitelial do Ovário , Cistadenocarcinoma Seroso/mortalidade , Intervalo Livre de Doença , Feminino , Perfilação da Expressão Gênica , Humanos , Pessoa de Meia-Idade , Neoplasias Epiteliais e Glandulares/mortalidade , Neoplasias Ovarianas/mortalidade , Prognóstico
4.
Hernia ; 15(6): 655-8, 2011 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-21691736

RESUMO

PURPOSE: This retrospective chart review was designed to compare outcomes for open and laparoscopic repair of inguinal hernias in the population over the age of 80. METHODS: A retrospective chart review was conducted for 104 patients over 80 years old who underwent inguinal hernia repair (2005-2008) at The Mount Sinai Medical Center. Patients were grouped into laparoscopic or open repair cohorts and compared accordingly. RESULTS: The open group (n = 73) and the laparoscopic group (n = 31) had mean ages of 84 and 83 years, respectively. The mean American Society of Anesthesiologists score was 2.6 for the open cohort and 2.3 for the laparoscopic group (P < 0.05). Peri-operative complications in the open and laparoscopic groups were not found to be statistically significant. There was no mortality in either group. CONCLUSIONS: With octogenarians, laparoscopic inguinal hernia repair can be performed as a safe alternative to open repair with comparable rates of morbidity and mortality.


Assuntos
Hérnia Inguinal/cirurgia , Herniorrafia/efeitos adversos , Herniorrafia/métodos , Idoso de 80 Anos ou mais , Anestesia Geral , Arritmias Cardíacas/etiologia , Feminino , Humanos , Hipotensão/etiologia , Laparoscopia , Tempo de Internação , Masculino , Dor Pós-Operatória/etiologia , Estudos Retrospectivos , Fatores de Tempo , Resultado do Tratamento , Retenção Urinária/etiologia
5.
Clin Radiol ; 66(7): 609-13, 2011 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-21450282

RESUMO

AIM: To estimate the acceptable compression ratio of full-field digital mammography (FFDM) using the Joint Photographic Experts Group (JPEG) 2000 compression algorithm. MATERIALS AND METHODS: Eighty cases that included images of 40 masses (20 benign, 20 malignant) and 40 microcalcifications (20 benign, 20 malignant) were collected. The images were compressed to five different lossy ratios: 20:1, 40:1, 60:1, 80:1, and 100:1, and four radiologists independently determined whether the compressed group was distinguishable from the control group. The ratio of the compressed group that was rated indistinguishable from the control group was compared for each reviewer, and the results were analysed for agreements of three or more reviewers. RESULTS: The ability to distinguish the compressed image from the control group is given as a range across the four reviewers: 0-1.3% (0/80 to 1/80) of the 20:1, 0-2.5% (0/80 to 2/80) of the 40:1, 5-7.5% (4/80 to 6/80) of the 60:1, 10-37.5% (8/80 to 30/80) of the 80:1, and 30-87.5% (24/80 to 70/80) of the 100:1. For three compression groups (20:1, 40:1, and 60:1), three or more reviewers agreed that there was a distinguishable difference for 0/80, 0/80, and 3/80 images, respectively. Thus, the compressed images do not differ significantly from the control group (p>0.05). However, the 80:1 and 100:1 compressed images were different for 9/80 and 29/80 images, respectively, which is significantly different from the control group (p<0.05). CONCLUSION: The lossy 60:1 compression ratio for FFDM is visually identical to the control image and, therefore, potentially acceptable for primary interpretation.


Assuntos
Neoplasias da Mama/diagnóstico por imagem , Calcinose/diagnóstico por imagem , Compressão de Dados/métodos , Processamento de Imagem Assistida por Computador/métodos , Mamografia/métodos , Intensificação de Imagem Radiográfica/métodos , Adulto , Idoso , Algoritmos , Feminino , Humanos , Mamografia/instrumentação , Pessoa de Meia-Idade
6.
Lupus ; 18(2): 133-8, 2009 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-19151114

RESUMO

Patients with antiphospholipid syndrome (APS) have an increased risk for the development of thrombotic complications. Recent studies indicate that osteoprotegerin (OPG) acts as an important molecule in the development of vascular diseases. The aim of the present study was to examine the association between serum OPG levels and APS manifestations in patients with SLE. Seventy-nine patients with SLE and ninety-two healthy controls, matched for age and sex, were included in this study. Serum levels of OPG, monocyte chemoattractant protein(MCP)-1 and soluble E-selectin were determined by ELISA. At the time of serum sampling, various clinical and laboratory parameters were assessed. We found that serum levels of OPG were significantly higher in patients with SLE than in healthy controls (1236 +/- 82 vs 967 +/- 37 pg/mL, P = 0.003). Particularly, serum OPG levels were significantly higher in SLE patients with APS than those without (1615 +/- 191 vs 1171 +/- 91 pg/mL, P = 0.006). Serum OPG levels correlated with titres of IgG anti-cardiolipin antibody (P = 0.026) and anti-beta(2)-glycoprotein I antibody (P < 0.001). Moreover, serum OPG also correlated with serum levels of sE-selectin (P = 0.002), which is an endothelial cell activation marker, and MCP-1 (P = 0.003), a well known chemokine implicated in thrombogenesis. Collectively, serum OPG levels were increased in SLE patients with APS and correlated with titres of antiphospholipid antibodies, suggesting that OPG might be linked to the development of APS.


Assuntos
Anticorpos Antifosfolipídeos/sangue , Osteoprotegerina/sangue , Adulto , Estudos de Casos e Controles , Quimiocina CCL2/sangue , Selectina E/sangue , Feminino , Humanos , Lúpus Eritematoso Sistêmico/sangue , Masculino
7.
Clin Exp Immunol ; 153(2): 269-76, 2008 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-18713142

RESUMO

Mesenchymal stem cells (MSCs) have the inherent ability to migrate to multiple organs and to exert immunosuppressive activity. The aim of this study was to investigate the anti-arthritogenic effects of interleukin (IL)-10-transduced MSCs (IL-10-MSC) on the development of inflammatory arthritis. DBA/1 mice were immunized with type II collagen (CII) to induce inflammatory arthritis and then injected weekly three times with IL-10-MSCs 21 days after primary immunization. Control mice received vehicle or MSCs alone. Serum anti-CII antibody and T cell response to CII were determined. The results showed that cultured IL-10-MSCs were able to secrete high amounts of IL-10 in vitro. Injection of IL-10-MSCs decreased the severity of arthritis significantly. However, there was no difference in arthritis severity between mice treated with MSC and vehicle alone. Anti-CII antibody titres in the sera and T cell proliferative response to CII in lymph node cells were decreased significantly in mice treated with IL-10-MSCs compared with vehicle-treated mice. Serum IL-6 level was also decreased by the administration of IL-10-MSCs. In contrast, spleen cells of IL-10-MSC-treated mice produced higher amounts of IL-4 than those of control mice. Interestingly, although not as potent as IL-10-MSCs, injection of naive MSCs alone decreased serum levels of IL-6 and anti-CII antibody, while increasing IL-4 production from cultured splenic cells. Taken together, systemic administration of genetically modified MSCs overexpressing IL-10 inhibits experimental arthritis not only by suppressing autoimmune response to CII but also by regulating cytokine production, and thus would be a new strategy for treating rheumatoid arthritis.


Assuntos
Artrite Experimental/cirurgia , Interleucina-10/imunologia , Transplante de Células-Tronco Mesenquimais , Células-Tronco Mesenquimais/imunologia , Animais , Artrite Experimental/imunologia , Proliferação de Células , Colágeno Tipo II/imunologia , Citometria de Fluxo , Expressão Gênica , Vetores Genéticos/administração & dosagem , Vetores Genéticos/genética , Imunoglobulina G/análise , Interleucina-10/análise , Interleucina-4/análise , Interleucina-4/imunologia , Masculino , Camundongos , Camundongos Endogâmicos DBA , Retroviridae/genética , Transdução Genética/métodos
8.
Rev Sci Instrum ; 79(5): 054702, 2008 May.
Artigo em Inglês | MEDLINE | ID: mdl-18513083

RESUMO

We present a systematic study of the development of a novel atmospheric microwave plasma system for material processing in the pressure range up to 760 torr and the microwave input power up to 6 kW. Atmospheric microwave plasma was reliably produced and sustained by using a cylindrical resonator with the TM(011) cavity mode. The applicator and the microwave cavity, which is a cylindrical resonator, are carefully designed and optimized with the time dependent finite element Maxwell equation solver. The azimuthal apertures are placed at the maximum magnetic field positions between the cavity and the applicator to maximize the coupling efficiency into the microwave plasma at a resonant frequency of 2.45 GHz. The system consists of a magnetron power supply, a circulator, a directional coupler, a three-stub tuner, a dummy load, a coaxial cavity, and a central cavity. Design and construction of the resonant structures and diagnostics of atmospheric plasma using optical experiments are discussed in various ranges of pressure and microwave input power for different types of gases.

9.
Funct Integr Genomics ; 8(4): 341-59, 2008 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-18414911

RESUMO

Soybean rust caused by Phakopsora pachyrhizi Sydow is a devastating foliar disease that has spread to most soybean growing regions throughout the world, including the USA. Four independent rust resistance genes, Rpp1-Rpp4, have been identified in soybean that recognize specific isolates of P. pachyrhizi. A suppressive subtraction hybridization (SSH) complementary DNA (cDNA) library was constructed from the soybean accession PI200492, which contains Rpp1, after inoculation with two different isolates of P. pachyrhizi that result in susceptible or immune reactions. Both forward and reverse SSH were performed using cDNA from messenger RNA pooled from 1, 6, 12, 24, and 48 h post-inoculation. A total of 1,728 SSH clones were sequenced and compared to sequences in GenBank for similarity. Microarray analyses were conducted on a custom 7883 soybean-cDNA clone array encompassing all of the soybean-rust SSH clones and expressed sequence tags from four other soybean cDNA libraries. Results of the microarray revealed 558 cDNA clones differentially expressed in the immune reaction. The majority of the upregulated cDNA clones fell into the functional category of defense. In particular, cDNA clones with similarity to peroxidases and lipoxygenases were prevalent. Downregulated cDNA clones included those with similarity to cell-wall-associated protein, such as extensins, proline-rich proteins, and xyloglucan endotransglycosylases.


Assuntos
Basidiomycota/patogenicidade , Glycine max/enzimologia , Glycine max/genética , Lipoxigenase/metabolismo , Perfilação da Expressão Gênica , Regulação Enzimológica da Expressão Gênica , Regulação da Expressão Gênica de Plantas , Dados de Sequência Molecular , Análise de Sequência com Séries de Oligonucleotídeos , Peroxidases/metabolismo , Proteínas de Plantas/genética , Glycine max/microbiologia , Glycine max/fisiologia
10.
Int J Gynecol Cancer ; 18(2): 300-5, 2008.
Artigo em Inglês | MEDLINE | ID: mdl-17587322

RESUMO

The purpose of this study was to determine whether Toll-like receptor 5 (TLR5) expression was associated with disease progression in cervical neoplasia. TLR5 expression was evaluated by immunohistochemistry (IHC) in 55 formalin-fixed paraffin-embedded cervical tissues; 10 normal cervical specimens, 9 low-grade cervical intraepithelial neoplasias (CINs), 12 high-grade CINs, and 24 invasive squamous cell carcinomas (ISCCs). TLR5 expression was also evaluated at the RNA level, in fresh, frozen cervical carcinoma tissues by real-time quantitative RT-PCR. TLR5 expression, which was mainly observed as cytoplasmic staining, gradually increased in accordance with the histopathologic grade in the following order: low-grade CIN less than high-grade CIN less than ISCC (P < 0.001). Immunohistochemical staining showed that TLR5 expression was undetectable (80%) or weak (20%) in normal cervical squamous epithelial tissues. However, moderate expression was detected in 33.3% of low-grade CIN (3/9), 41.7% of high-grade CIN (5/12), and 45.8% of ISCC (11/24). Strong expression was detected in as much as 33.3% of high-grade CIN (4/12) and 50% of ISCC (12/24). Contrary to IHC results, real-time quantitative RT-PCR revealed that TLR5 expression in tumors was not statistically different compared to normal cervical tissues (P = 0.1452). The IHC result suggests that TLR5 may play a significant role in tumor progression of cervical neoplasia and may represent a useful marker for malignant transformation of cervical squamous cells.


Assuntos
Biomarcadores Tumorais/biossíntese , Carcinoma de Células Escamosas/metabolismo , Receptor 5 Toll-Like/biossíntese , Displasia do Colo do Útero/metabolismo , Neoplasias do Colo do Útero/metabolismo , Progressão da Doença , Feminino , Humanos
11.
Phys Med Biol ; 52(18): 5509-30, 2007 Sep 21.
Artigo em Inglês | MEDLINE | ID: mdl-17804879

RESUMO

The deposition of gadolinium through ultrasound-induced blood-brain barrier (BBB) openings in the murine hippocampus was investigated. First, wave propagation simulations through the intact mouse skull revealed minimal beam distortion while thermal deposition simulations, at the same sonication parameters used to induce BBB opening in vivo, revealed temperature increases lower than 0.5 degrees C. The simulation results were validated experimentally in ex vivo skulls (m = 6) and in vitro tissue specimens. Then, in vivo mice (n = 9) were injected with microbubbles (Optison; 25-50 microl) and sonicated (frequency: 1.525 MHz, pressure amplitudes: 0.5-1.1 MPa, burst duration: 20 ms, duty cycle: 20%, durations: 2-4 shots, 30 s per shot, 30 s interval) at the left hippocampus, through intact skin and skull. Sequential, high-resolution, T1-weighted MRI (9.4 Tesla, in-plane resolution: 75 microm, scan time: 45-180 min) with gadolinium (Omniscan; 0.5 ml) injected intraperitoneally revealed a threshold of the BBB opening at 0.67 MPa and BBB closing within 28 h from opening. The contrast-enhancement area and gadolinium deposition path were monitored over time and the influence of vessel density, size and location was determined. Sonicated arteries, or their immediate surroundings, depicted greater contrast enhancement than sonicated homogeneous brain tissue regions. In conclusion, gadolinium was delivered through a transiently opened BBB and contained to a specific brain region (i.e., the hippocampus) using a single-element focused ultrasound transducer. It was also found that the amount of gadolinium deposited in the hippocampal region increased with the acoustic pressure and that the spatial distribution of the BBB opening was determined not only by the ultrasound beam, but also by the vasculature of the targeted brain region.


Assuntos
Barreira Hematoencefálica/metabolismo , Barreira Hematoencefálica/efeitos da radiação , Sistemas de Liberação de Medicamentos/métodos , Gadolínio/farmacocinética , Hipocampo/metabolismo , Modelos Biológicos , Sonicação , Albuminas/uso terapêutico , Animais , Simulação por Computador , Feminino , Fluorocarbonos/uso terapêutico , Hipocampo/irrigação sanguínea , Masculino , Taxa de Depuração Metabólica , Camundongos , Camundongos Endogâmicos C57BL , Distribuição Tecidual
12.
Water Sci Technol ; 55(5): 203-8, 2007.
Artigo em Inglês | MEDLINE | ID: mdl-17489411

RESUMO

This paper reviews taste and odour (T&O) issues of South Korea's water industry. For this purpose, an overview of the water supply systems and drinking water standards is presented and some results from citizen surveys for customer satisfaction are included. A case study is presented in which the water intake was shifted from inside a main reservoir to a downstream location due to T&O problems. It is true that the South Korean water industry has long relied on the tolerance of consumers for periodic T&O events. Recently the South Korean water industry has become aware that the T&O problems are at the centre of consumers' concerns and has taken several positive approaches. These include monitoring T&O events using sensory and instrumental methods, installation of a baffled-channel PAC contactor and application of advanced water treatment processes.


Assuntos
Odorantes/análise , Paladar , Poluentes Químicos da Água/análise , Purificação da Água/métodos , Comportamento do Consumidor , Monitoramento Ambiental/métodos , Humanos , Coreia (Geográfico) , Inquéritos e Questionários , Água/análise , Poluentes da Água , Poluição da Água , Abastecimento de Água
13.
Clin Exp Immunol ; 147(3): 573-9, 2007 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-17302909

RESUMO

Interleukin (IL)-4 has been demonstrated to have anti-inflammatory and anti-tumour activity. Because aberrant angiogenesis is a significant pathogenic component of tumour growth and chronic inflammation, we investigated the effect of IL-4 on the production of vascular endothelial growth factor (VEGF) by synovial fibroblasts derived from patients with rheumatoid arthritis (RA). Fibroblast-like synoviocytes (FLS) were prepared from synovial tissues of RA and incubated with different concentrations of IL-4 in the presence or absence of transforming growth factor (TGF)-beta. VEGF level was measured by enzyme-linked immunosorbent assay and semiquantitative reverse transcription--polymerase chain reaction. Treatment of FLS with IL-4 alone caused a dose-dependent increase in VEGF levels. In contrast, IL-4 exhibited the inhibitory effect on VEGF production when FLS were stimulated with TGF-beta. Combined treatment of IL-4 and IL-10 inhibited TGF-beta-induced VEGF production in an additive fashion. TGF-beta increased the induction of cyclooxygenase-2 mRNA, which was inhibited significantly by the treatment of IL-4. NS-398, a COX-2 inhibitor, inhibited TGF-beta-induced VEGF production in a dose-dependent manner. Furthermore, exogenous addition of prostaglandin E2 (PGE2) restored IL-4 inhibition on TGF-beta induced VEGF production. Collectively, our results suggest that IL-4 have an anti-angiogenic effect, especially in the inflammatory milieu of RA by inhibiting the VEGF production in synovial fibroblasts.


Assuntos
Artrite Reumatoide/metabolismo , Fibroblastos/efeitos dos fármacos , Interleucina-4/farmacologia , Membrana Sinovial/metabolismo , Fator A de Crescimento do Endotélio Vascular/biossíntese , Artrite Reumatoide/patologia , Células Cultivadas , Dinoprostona/biossíntese , Dinoprostona/fisiologia , Relação Dose-Resposta a Droga , Regulação para Baixo/efeitos dos fármacos , Fibroblastos/metabolismo , Regulação da Expressão Gênica/efeitos dos fármacos , Humanos , RNA Mensageiro/genética , Reação em Cadeia da Polimerase Via Transcriptase Reversa/métodos , Membrana Sinovial/patologia , Fator de Crescimento Transformador beta/antagonistas & inibidores , Fator de Crescimento Transformador beta/farmacologia , Fator A de Crescimento do Endotélio Vascular/genética
14.
Clin Exp Immunol ; 146(2): 362-70, 2006 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-17034590

RESUMO

Connective tissue growth factor (CTGF) plays a role in the fibrotic process of systemic sclerosis (SSc). Because hypoxia is associated with fibrosis in several profibrogenic conditions, we investigated whether CTGF expression in SSc fibroblasts is regulated by hypoxia. Dermal fibroblasts from patients with SSc and healthy controls were cultured in the presence of hypoxia or cobalt chloride (CoCl(2)), a chemical inducer of hypoxia-inducible factor (HIF)-1alpha. Expression of CTGF was evaluated by Northern and Western blot analyses. Dermal fibroblasts exposed to hypoxia (1% O(2)) or CoCl(2) (1-100 microM) enhanced expression of CTGF mRNA. Skin fibroblasts transfected with HIF-1alpha showed the increased levels of CTGF protein and mRNA, as well as nuclear staining of HIF-1alpha, which was enhanced further by treatment of CoCl(2). Simultaneous treatment of CoCl(2) and transforming growth factor (TGF)-beta additively increased CTGF mRNA in dermal fibroblasts. Interferon-gamma inhibited the TGF-beta-induced CTGF mRNA expression dose-dependently in dermal fibroblasts, but they failed to hamper the CoCl(2)-induced CTGF mRNA expression. In addition, CoCl(2) treatment increased nuclear factor (NF)-kappaB binding activity for CTGF mRNA, while decreasing IkappaBalpha expression in dermal fibroblasts. Our data suggest that hypoxia, caused possibly by microvascular alterations, up-regulates CTGF expression through the activation of HIF-1alpha in dermal fibroblasts of SSc patients, and thereby contributes to the progression of skin fibrosis.


Assuntos
Fibroblastos/metabolismo , Proteínas Imediatamente Precoces/biossíntese , Peptídeos e Proteínas de Sinalização Intercelular/biossíntese , Escleroderma Sistêmico/metabolismo , Pele/metabolismo , Hipóxia Celular/fisiologia , Células Cultivadas , Cobalto/farmacologia , Fator de Crescimento do Tecido Conjuntivo , Humanos , Subunidade alfa do Fator 1 Induzível por Hipóxia/genética , Subunidade alfa do Fator 1 Induzível por Hipóxia/metabolismo , Proteínas Imediatamente Precoces/genética , Peptídeos e Proteínas de Sinalização Intercelular/genética , NF-kappa B/fisiologia , RNA Mensageiro/genética , Transdução de Sinais/fisiologia , Transfecção , Fator de Crescimento Transformador beta/farmacologia , Regulação para Cima/efeitos dos fármacos , Regulação para Cima/fisiologia
15.
Br J Cancer ; 94(11): 1678-82, 2006 Jun 05.
Artigo em Inglês | MEDLINE | ID: mdl-16721365

RESUMO

Phosphorylated AKT (pAKT) is a major contributor to radioresistance in human cancers. The aim of this study was to investigate the association of pAKT expression and radiation resistance in cervical cancer. A retrospective review was made of the records of 27 women who received primary radiation therapy due to locally advanced cervical cancer (LACC) with FIGO stage IIB-IVA. Nine patients regarded as radiation resistant developed local recurrences with a median progression free interval of 9 months. Eighteen patients did not show local recurrences, and were regarded as a radiation-sensitive group. Using pretreatment paraffin-embedded tissues, we evaluated pAKT expression by immunohistochemistry. A significant association was found between the level of pAKT expression and local recurrence. Immunohistochemical staining for pAKT was significantly more frequent in the radiation-resistant than in the radiation-sensitive group (P=0.004). The mean progression-free survival was 86 months for patients with pAKT-negative staining (19 cases) and 44 months for patients with pAKT-positive expression (eight cases) (P=0.008). These results suggest that signalling from phosphatidylinositide 3-kinase/pAKT can lead to radiation resistance, and that evaluation of pAKT may be a prognostic marker for response to radiotherapy in LACC.


Assuntos
Proteína Oncogênica v-akt/genética , Tolerância a Radiação/genética , Neoplasias do Colo do Útero/genética , Adulto , Idoso , Idoso de 80 Anos ou mais , Progressão da Doença , Feminino , Regulação Neoplásica da Expressão Gênica/efeitos da radiação , Humanos , Imuno-Histoquímica , Pessoa de Meia-Idade , Estadiamento de Neoplasias , Proteína Oncogênica v-akt/metabolismo , Fosforilação , Recidiva , Neoplasias do Colo do Útero/patologia , Neoplasias do Colo do Útero/radioterapia
16.
Artigo em Inglês | MEDLINE | ID: mdl-16422409

RESUMO

Nonlinear beam mixing with microbubbles was explored to create a pseudo point source for aberration correction of therapeutic ultrasound. A damping coefficient for a bubble driven by a dual frequency sound field was derived by revisiting Prosperetti's linearized damping model. As a result, the overall damping term for dual frequency was obtained by linear summation of two damping terms for each frequency. The numerical simulation based on the bubble model suggests that the most efficient size range to generate a 1 MHz frequency from 4 MHz and 5 MHz sound sources is 2.6 to 3.0 microm. Furthermore, this size range constitutes the primary distribution of a specific ultrasound contrast agent. When a chamber of 0.1% of the diluted agent is sonified by 4 MHz and 5 MHz sound beams with 80 degrees incident angle between them, an approximately 100 Pa, 1 MHz difference frequency signal can be measured approximately 10 cm away. In addition, the received 1 MHz difference frequency signal shows omni-directional characteristics, even though the overlap zone of the two sound beams is on the order of the difference frequency wavelength. Therefore, the induced sound source can be considered as a pseudo point source and is expected to be useful for aberration correction for therapeutic ultrasound.


Assuntos
Artefatos , Tecido Conjuntivo/fisiologia , Tecido Conjuntivo/efeitos da radiação , Modelos Biológicos , Radiometria/métodos , Terapia por Ultrassom/métodos , Animais , Simulação por Computador , Humanos , Dinâmica não Linear , Doses de Radiação , Espalhamento de Radiação , Ultrassom
17.
Scand J Immunol ; 60(1-2): 159-66, 2004.
Artigo em Inglês | MEDLINE | ID: mdl-15238085

RESUMO

DNA is a nuclear macromolecule that circulates in the blood where its levels can reflect the activity of inflammatory and malignant diseases. While dead and dying cells have usually been considered the source of blood DNA, the mechanisms for its release during apoptosis and necrosis are not well defined. To elucidate DNA release, an in vitro model system was used, assessing DNA in the media of living, apoptotic or necrotic Jurkat and U937 cells. Apoptosis was induced by etoposide, camptothecin or staurosporine, while necrosis was induced by heating at 56 degrees C. DNA release was measured by fluorometry with the dye PicoGreen while the extent of death was measured by fluorescence-activated cell sorter analysis with propidium iodide and annexin. Apoptotic Jurkat cells released significantly more DNA in the media than untreated cells while necrotic cells did not show significant DNA release. U937 cells showed similar findings. Pretreatment of Jurkat cells with z-VAD-fmk, a caspase inhibitor, reduced both apoptosis and DNA release. By gel electrophoresis, extracellular DNA from apoptotic cells showed laddering with low molecular weight fragments. These studies suggest that extracellular release of DNA is a consequence of apoptosis and may account for some of the DNA in the blood.


Assuntos
Apoptose/imunologia , DNA/imunologia , Linfócitos/metabolismo , Monócitos/metabolismo , Clorometilcetonas de Aminoácidos/farmacologia , Anexina A5 , Apoptose/genética , Camptotecina/farmacologia , Inibidores Enzimáticos/farmacologia , Etoposídeo/farmacologia , Citometria de Fluxo , Corantes Fluorescentes/metabolismo , Fluorometria , Humanos , Células Jurkat , Linfócitos/imunologia , Monócitos/imunologia , Necrose , Compostos Orgânicos , Propídio , Estatísticas não Paramétricas , Estaurosporina/farmacologia , Células U937
18.
Rheumatology (Oxford) ; 42(5): 665-72, 2003 May.
Artigo em Inglês | MEDLINE | ID: mdl-12709543

RESUMO

OBJECTIVE: PG201 has been formulated using 12 herbs known to have anti-inflammatory and protective effects on damaged tissue and bone among other functions. The present study was done in order to assess the therapeutic effects of PG201 in collagen-induced arthritis (CIA) in mice. METHODS: DBA/1 mice were immunized with bovine type II collagen. After a second collagen immunization, mice were treated with PG201 orally at 10 mg/kg once a day for 18 days. Paws were evaluated macroscopically for redness, swelling and deformities. The levels of TNF-alpha and IL-1beta in the ankle were examined. The severity of arthritis within the knee joints was evaluated by histological assessment of cartilage destruction and pannus formation. Molecular indicators related to CIA pathology were analysed by measuring the serum levels of matrix metalloproteinase 2 (MMP-2), tissue inhibitor of matrix metalloproteinase 2 (TIMP-2) and the anti-inflammatory cytokines interleukin (IL)-4 and IL-10. RESULTS: Administration of PG201 significantly suppressed the progression of CIA and inhibited the production of TNF-alpha and IL-1beta in the paws. The erosion of cartilage was dramatically reduced in mouse knees after treatment with PG201. In the serum of PG201-treated mice, the level of TIMP-2 and the ratio of TIMP-2 to MMP-2 were significantly elevated, and the level of IL-4, but not of IL-10, was increased. CONCLUSION: Administration of PG201 has therapeutic effects on CIA. Protection of cartilage was particularly prominent. PG201 is a potential therapy for rheumatoid arthritis.


Assuntos
Antirreumáticos/uso terapêutico , Artrite Experimental/prevenção & controle , Medicamentos de Ervas Chinesas/uso terapêutico , Fitoterapia , Extratos Vegetais/uso terapêutico , Animais , Antirreumáticos/toxicidade , Artrite Experimental/metabolismo , Artrite Experimental/patologia , Colágeno , Progressão da Doença , Relação Dose-Resposta a Droga , Medicamentos de Ervas Chinesas/toxicidade , Etanol , Feminino , Interleucina-1/análise , Interleucinas/sangue , Masculino , Metaloproteinase 2 da Matriz/sangue , Camundongos , Camundongos Endogâmicos DBA , Fitoterapia/efeitos adversos , Ratos , Ratos Sprague-Dawley , Inibidores Teciduais de Metaloproteinases/sangue , Fator de Necrose Tumoral alfa/análise
19.
IEEE Trans Neural Netw ; 14(6): 1437-48, 2003.
Artigo em Inglês | MEDLINE | ID: mdl-18244589

RESUMO

Models of real-world applications often include a large number of parameters with a wide dynamic range, which contributes to the difficulties of neural network training. Creating the training data set for such applications becomes costly, if not impossible. In order to overcome the challenge, one can employ an active learning technique known as query-based learning (QBL) to add performance-critical data to the training set during the learning phase, thereby efficiently improving the overall learning/generalization. The performance-critical data can be obtained using an inverse mapping called network inversion (discrete network inversion and continuous network inversion) followed by oracle query. This paper investigates the use of both inversion techniques for QBL learning, and introduces an original heuristic to select the inversion target values for continuous network inversion method. Efficiency and generalization was further enhanced by employing node decoupled extended Kalman filter (NDEKF) training and a causality index (CI) as a means to reduce the input search dimensionality. The benefits of the overall QBL approach are experimentally demonstrated in two aerospace applications: a classification problem with large input space and a control distribution problem.

20.
Neuropharmacology ; 43(3): 408-17, 2002 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-12243770

RESUMO

Previously we have reported that astrocytes deprived of glucose were highly vulnerable to peroxynitrite (Choi and Kim, J. Neurosci. Res. 54 (1998) 870; Neurosci. Lett. 256 (1988) 109; Ju et al., J. Neurochem. 74 (2000) 1989). Here we report that ciclopirox, which is clinically used as an anti-fungal agent, completely prevents the increased death in glucose-deprived astrocytes exposed to 3-morpholinosydnonimine (SIN-1, a peroxynitrite-releasing reagent). The increased vulnerability was in good correlation with the peroxynitrite-evoked decrease of mitochondrial transmembrane potential (MTP) in astrocytes. A simultaneous exposure to glucose deprivation and SIN-1 rapidly depolarized MTP and depleted ATP in astrocytes. Inclusion of ciclopirox initially increased the MTP, maintained it high, and blocked the ATP depletion in glucose-deprived SIN-1-treated astrocytes. However, ciclopirox did not prevent the depletion of reduced glutathione in glucose-deprived SIN-1-treated astrocytes. Consistently, ciclopirox did not scavenge various kinds of oxidants including peroxynitrite, nitric oxide, superoxide anion, hydrogen peroxide and hydroxyl radical. Ciclopirox has been experimentally used as a cell cycle G1/S phase transition blocker (Hoffman et al., Cytometry 12 (1991) 26). Flow cytometry analysis, however, showed that the cytoprotective effect of ciclopirox was not attributed to its inhibition of the cell cycle progression. The present results indicate that ciclopirox protects astrocytes from peroxynitrite cytotoxicity by attenuating peroxynitrite-induced mitochondrial dysfunction.


Assuntos
Astrócitos/efeitos dos fármacos , Mitocôndrias/efeitos dos fármacos , Molsidomina/análogos & derivados , Fármacos Neuroprotetores/farmacologia , Ácido Peroxinitroso/antagonistas & inibidores , Ácido Peroxinitroso/toxicidade , Piridonas/farmacologia , Trifosfato de Adenosina/metabolismo , Animais , Ciclo Celular/efeitos dos fármacos , Morte Celular/efeitos dos fármacos , Células Cultivadas , Ciclopirox , Citometria de Fluxo , Glutationa/metabolismo , Peróxido de Hidrogênio/metabolismo , Radical Hidroxila/metabolismo , L-Lactato Desidrogenase/metabolismo , Potenciais da Membrana/efeitos dos fármacos , Molsidomina/farmacologia , Óxido Nítrico/metabolismo , Oxirredução , Ratos , Ratos Sprague-Dawley , Rodaminas , Soroalbumina Bovina/química , Soroalbumina Bovina/metabolismo , Superóxidos/metabolismo , Tirosina/metabolismo
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