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1.
Eur Radiol ; 34(1): 236-246, 2024 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-37505251

RESUMO

OBJECTIVES: To retrospectively evaluate the safety and efficacy of computed tomography (CT)-guided percutaneous microwave ablation in treating early-stage non-small cell lung cancer (NSCLC) adjacent to bronchovascular bundles. METHODS: Two hundred and thirty-one patients with early-stage NSCLC who underwent CT-guided microwave ablation of the tumor were included for analysis. Among these, 66 lesions were located adjacent to the bronchovascular bundle. Achievement of the specific ablation range (defined as the ablation zone encompassing the tumor and the adjacent vessel) was assessed after ablation. Complications and tumor progression after treatment were examined and compared between the bronchovascular bundle and non-bronchovascular bundle groups. RESULTS: A total of 231 patients were included. Overall, 1-, 2-, and 3-year local progression-free survival (LPFS) was 77.4%, 70.5%, and 63.8%, respectively. Bronchovascular bundle proximity, pure-solid tumor, tumor size, and ablation margin < 5 mm were independent risk factors for local progression in multivariate analysis. In the bronchovascular bundle group, the 1-, 2- and 3-year LPFS rates were 63.0%, 50.7%, and 43.4%, respectively; vessel proximity and specific ablation range failure were independent risk factors for local progression. Overall survival in the entire cohort was 93.0% at 1 year, 76.1% at 2 years, and 55.0% at 3 years. The incidence of postoperative complications did not significantly differ between the two groups (p > 0.05). The most common complication was pneumothorax. Severe hemoptysis did not occur. CONCLUSION: Tumor location near the bronchovascular bundles was a significant risk factor for local progression after microwave ablation. Achieving a specific ablation range may increase LPFS for these lesions. CLINICAL RELEVANCE STATEMENT: Achieving the specific ablation range may improve local efficacy for early-stage non-small cell lung cancer located adjacent to the bronchovascular bundle. KEY POINTS: • Local efficacy of percutaneous microwave ablation in treating early-stage non-small cell lung cancer was affected by bronchovascular bundle proximity. • Achieving the specific ablation range may improve local efficacy for lesions located adjacent to the bronchovascular bundle.


Assuntos
Carcinoma Pulmonar de Células não Pequenas , Ablação por Cateter , Neoplasias Pulmonares , Carcinoma de Pequenas Células do Pulmão , Humanos , Carcinoma Pulmonar de Células não Pequenas/diagnóstico por imagem , Carcinoma Pulmonar de Células não Pequenas/cirurgia , Neoplasias Pulmonares/diagnóstico por imagem , Neoplasias Pulmonares/cirurgia , Micro-Ondas/uso terapêutico , Estudos Retrospectivos , Ablação por Cateter/métodos , Tomografia Computadorizada por Raios X/métodos , Resultado do Tratamento
2.
J Hepatocell Carcinoma ; 10: 2187-2196, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-38084210

RESUMO

Purpose: To investigate the feasibility and efficacy of implanting an iodine-125 (125I) seed strand inside a portal vein stent (PVS) in the treatment of patients with hepatocellular carcinoma (HCC) and main portal vein tumor thrombus (mPVTT). Patients and Methods: Twenty-three patients who diagnosed with HCC and mPVTT and underwent endovascular implantation 125I seed strands and portal vein stenting were included in this study. Patients were divided into two groups. For patients in group A (n = 12), the 125I seed strand was placed outside the PVS, and for those in group B (n = 11), the strand was placed inside the PVS. Technical success, pain intensity during the procedure (numeric rating scale), procedure-related complications, changes in liver function, stent patency, and survival rates were recorded and analyzed. Results: The procedures were successful in all patients, and no serious procedure-related complications occurred in either group. Pain intensity during the procedure was significantly lower in group B than in group A (2.64 ± 1.50 vs 4.08 ± 1.78, p = 0.048), and there were no significant differences between pre- and post-procedure liver function in either group. The median duration of stent patency was 9 months (95% CI 2.21-15.79 months) in group A and 12 months (95% CI 3.63-18.37 months) in group B (p = 0.670). Median survival was 12 months (95% CI 10.30-13.70 months) in group A and 13 months (95% CI 10.03-15.97 months) in group B (p = 0.822). The cumulative stent patency and survival rates at 3, 6, and 12 months were 75%, 50%, and 41.7%, and 83.3%, 75%, and 50% in group A and 72.7%, 62.3%, and 31.2%, and 90.9%, 80.8%, and 50.5%, respectively. Conclusion: Implantation of 125I seed strand inside the PVS is effective and feasible for treating patients with HCC and mPVTT.

3.
Int Immunopharmacol ; 118: 110107, 2023 May.
Artigo em Inglês | MEDLINE | ID: mdl-37028274

RESUMO

In recent years, the study of NOD-like receptor thermal protein domain associated protein 3 (NLRP3) inflammasome has become a hot topic, especially its role in various tumors. The incidence of hepatocellular carcinoma is ranked in the top five in China. Hepatocellular carcinoma (HCC) is the predominant and typical form of primary liver cancer. Due to the close relationship between NLRP3 inflammasome and cancers, many studies have investigated its role in HCC. The results suggest that NLRP3 inflammasome participates in both tumor growth inhibition and tumor growth promotion in HCC. Therefore, this review elaborates on the relationship between NLRP3 and HCC and explains its role in HCC. In addition, the potential of NLRP3 as a therapeutic target for cancer therapy is explored, summarizing and classifying impacts of and processes underlying different NLRP3 inflammasome-targeting drugs on HCC.


Assuntos
Carcinoma Hepatocelular , Neoplasias Hepáticas , Humanos , Inflamassomos/metabolismo , Carcinoma Hepatocelular/tratamento farmacológico , Carcinoma Hepatocelular/metabolismo , Proteína 3 que Contém Domínio de Pirina da Família NLR/metabolismo , Neoplasias Hepáticas/metabolismo , China , Piroptose
4.
IEEE Trans Neural Netw Learn Syst ; 34(6): 3205-3219, 2023 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-35622806

RESUMO

Real-time semantic segmentation is widely used in autonomous driving and robotics. Most previous networks achieved great accuracy based on a complicated model involving mass computing. The existing lightweight networks generally reduce the parameter sizes by sacrificing the segmentation accuracy. It is critical to balance the parameters and accuracy for real-time semantic segmentation. In this article, we propose a lightweight multiscale-feature-fusion network (LMFFNet) mainly composed of three types of components: split-extract-merge bottleneck (SEM-B) block, feature fusion module (FFM), and multiscale attention decoder (MAD), where the SEM-B block extracts sufficient features with fewer parameters. FFMs fuse multiscale semantic features to effectively improve the segmentation accuracy and the MAD well recovers the details of the input images through the attention mechanism. Without pretraining, LMFFNet-3-8 achieves 75.1% mean intersection over union (mIoU) with 1.4 M parameters at 118.9 frames/s using RTX 3090 GPU. More experiments are investigated extensively on various resolutions on other three datasets of CamVid, KITTI, and WildDash2. The experiments verify that the proposed LMFFNet model makes a decent tradeoff between segmentation accuracy and inference speed for real-time tasks. The source code is publicly available at https://github.com/Greak-1124/LMFFNet.

5.
Acta Radiol ; 64(3): 918-925, 2023 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-35593049

RESUMO

BACKGROUND: Iodine concentrations measured using dual-energy spectral CT (DESCT) have been recently proposed as providing good performance for examining tissues hemodynamics. PURPOSE: To evaluate the diagnostic efficacy of DESCT-derived parameters in evaluating portal venous pressure in patients with liver cirrhosis. MATERIAL AND METHODS: A total of 71 patients with liver cirrhosis who underwent percutaneous transhepatic portal vein puncture procedures were included in this study. All participants underwent DESCT and gastrointestinal endoscopy within one month before the operation. The direct portal venous pressure of each participant was measured preoperatively. RESULTS: Stepwise multivariate linear regression analysis showed that the iodine concentrations in the portal vein and hepatic parenchyma during the portal venous phase and the platelet count were independently correlated with the direct portal venous pressure (P < 0.001, P < 0.001, and P = 0.030, respectively). Receiver operating characteristic analysis revealed that the normalized iodine concentration of the hepatic parenchyma had the best performance for identifying clinically significant portal hypertension (≥10 mmHg), esophageal varices, and high-risk esophageal varices (the area under the curve values were 0.951, 0.932, and 0.960, respectively). CONCLUSION: The normalized iodine concentration of the hepatic parenchyma is a reliable parameter to non-invasively assess portal venous pressure in patients with liver cirrhosis.


Assuntos
Varizes Esofágicas e Gástricas , Hipertensão Portal , Iodo , Humanos , Varizes Esofágicas e Gástricas/diagnóstico por imagem , Hipertensão Portal/complicações , Hipertensão Portal/diagnóstico por imagem , Cirrose Hepática/complicações , Cirrose Hepática/diagnóstico por imagem , Tomografia Computadorizada por Raios X/métodos
6.
Front Immunol ; 13: 1069192, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-36569954

RESUMO

Introduction: To investigate immunogenic changes after percutaneous microwave ablation (MWA) in pulmonary malignancies. Methods: Twenty-two consecutive patients with pulmonary malignancies who underwent percutaneous lung tumor MWA were prospectively enrolled in this study. Peripheral blood samples were collected on the day before (D0) and one month (M1) after MWA. Changes in immune cell subsets (CD3+, CD4+, and CD8+ T cells, and B, natural killer, regulatory T (Treg), and CD3-CD20+ cells) and cytokines (interleukin [IL]-2, 4, 6, 10, 17A, tumor necrosis factor [TNF]-α, and interferon-γ) were noted and compared. Progression-free survival (PFS) and potentially related factors were analyzed. Results: The proportion of CD8+ T cells increased from 22.95 ± 7.38% (D0) to 25.95 ± 9.16% (M1) (p = 0.031). The proportion of Treg cells decreased from 10.82 ± 4.52% (D0) to 8.77 ± 2.05% (M1) (p = 0.049). The IL-2 concentration was also decreased from 1.58 ± 0.46 pg/mL (D0) to 1.26 ± 0.60 pg/mL (M1) (p = 0.028). The reduction in Treg cells predicted PFS independently of clinical prognostic features in multivariate analysis (hazard ratio = 4.97, 95% confidence interval: 1.32-18.66, p = 0.018). A reduction in the proportion of Treg cells was observed in 15 patients (68.2%) and the average of the reduction was 2.05 ± 4.60%. Those patients with a reduction in the proportion of Treg cells that was more than average showed a significantly longer median PFS time than those with a reduction that was less than average (16 months vs. 8.5 months, p = 0.025). Discussion: Percutaneous MWA of pulmonary malignancies leads to immunogenic changes. The reduction in the proportion of Treg cells was independently associated with PFS.


Assuntos
Citocinas , Neoplasias Pulmonares , Humanos , Micro-Ondas/uso terapêutico , Linfócitos T Reguladores , Interferon gama , Neoplasias Pulmonares/cirurgia , Fator de Necrose Tumoral alfa
7.
J Hazard Mater ; 423(Pt B): 127158, 2022 02 05.
Artigo em Inglês | MEDLINE | ID: mdl-34555765

RESUMO

Nanotechnology has provided a new opportunity for water decontamination from trace heavy metals, yet the relatively poor acidic stability remains a major obstacle for the nano-adsorbents, given that acidic treatment is frequently used to regenerate the heavy metal-saturated adsorbents. Zirconium phosphate (ZrP) is very promising for water treatment due to its absolute insoluble nature, though it interacts with heavy metals mainly through the non-specific electrostatic attraction. Herein, we prepared the ultrafine ZrP (~3.9 nm) inside the commercially available gel-type cation exchanger (N001), i.e., the sulfonated poly(styrene-co-divinylbenzene) bead. The resultant nanocomposite ZrP@N001 contained the amorphous nanoparticles (NPs) with metastable γ-ZrP structure as the main phase, unlike the layered α-ZrP formed inside the macroporous cation exchanger D001 (referred to as ZrP@D001). As a result, ZrP@N001 could selectively adsorb heavy metals through inner-sphere coordination, possessing a much stronger adsorption affinity than ZrP@D001, as confirmed by XPS analysis. In both batch and column assays on the Pb(II)-polluted water, ZrP@N001 exhibited superior adsorption performance over ZrP@D001. After adsorption, the exhausted ZrP@N001 was fully refreshed by acidic treatment for a 5-cyclic adsorption-regeneration run with constant removal efficiencies. This study may open a door for the rational design of highly efficient water purifiers for heavy metal control.


Assuntos
Metais Pesados , Poluentes Químicos da Água , Adsorção , Fosfatos , Zircônio
8.
Artigo em Inglês | MEDLINE | ID: mdl-34360405

RESUMO

The widespread usage of antibiotics in human and animal medication has brought global concerns over environmental contamination of antibiotic residues. In this study, 16 kinds of antibiotics in different environmental media of water, sediments, and soils in Anqing city, Anhui province were determined by ultra-performance liquid chromatography tandem mass spectrometry. A total of fourteen kinds of antibiotics were detected in surface water, with a total concentration up to 479 ng·L-1, while six kinds of antibiotics were detected in sediment and soil with concentrations ranging from 15.1 to 108 µg·kg-1. Ciprofloxacin (12.8-99.5 ng·L-1) and tetracycline (17.2-225 µg·kg-1) antibiotics exhibited the highest concentration in water and soil, respectively. In spatial distribution, the total concentration of antibiotics in surface water from the highest to the lowest followed the order of urban area, mainstream of Wan River, suburbs, tributaries of Wan River, indicating that the level of antibiotic concentration in surface water is positively associated with the frequency of human activities. In addition, the antibiotic mass fraction in agriculture land and fishpond were found higher than that in other sampling sites. Moreover, the environmental risk assessment results showed that ciprofloxacin, erythromycin, ofloxacin, enrofloxacin and tetracycline might pose medium to high risks to algae and bacteria in aquatic ecosystem.


Assuntos
Antibacterianos , Poluentes Químicos da Água , Animais , Antibacterianos/análise , China , Ecossistema , Monitoramento Ambiental , Humanos , Medição de Risco , Rios , Poluentes Químicos da Água/análise
9.
Nanotechnology ; 32(7): 075601, 2020 Nov 26.
Artigo em Inglês | MEDLINE | ID: mdl-33241789

RESUMO

The poor light absorption of visible light for Cs4PbBr6 nanocrystals (NCs) has severely impeded their practical applications. Although the semiconductor/perovskite heterostructure holds great promise for enhancement in absorption, it has remained a serious challenge for synthesizing a semiconductor/perovskite heterostructure. In this work, monodispersed Janus heterostructures composed of Cs4PbBr6 decorated with either multiple Ag or single Ag on its surface (named as mAg/Cs4PbBr6 and sAg/Cs4PbBr6 respectively), are successfully prepared. The size of Ag seeds has an important effect on the shape of the products. Small-sized Ag seeds lead to the formation of mAg/Cs4PbBr6 Janus NCs, while relatively large-sized Ag seeds produce sAg/Cs4PbBr6 Janus NCs. It is noted that this work not only provides a novel method for the modification of individual Cs4PbBr6 NCs, but also enhances the absorption of the Cs4PbBr6 in the visible region, indicating great potential for optoelectronic applications, such as photocatalysis and solar cells.

10.
Cardiovasc Intervent Radiol ; 43(9): 1353-1361, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32607616

RESUMO

PURPOSE: To evaluate whether anti-CTLA-4 therapy could suppress residual tumor progression and improve survival after insufficient radiofrequency ablation (RFA) in a subcutaneous murine hepatocellular carcinoma (HCC) model. MATERIALS AND METHODS: Forty mice with tumors established on their right flanks were randomly divided into four groups: control group (no treatment), RFA group (insufficient RFA alone), anti-CTLA-4 group (anti-CTLA-4 monotherapy), and RFA + anti-CTLA-4 group (insufficient RFA + anti-CTLA-4). In each group, eight mice were assessed for residual tumors and survival; another two mice were killed on day 14 for histopathologic studies. On day 42, a re-challenge test was performed in the survived mice of RFA + anti-CTLA-4 group to determine whether systemic anti-tumor immunity was established. RESULTS: The specific growth rate of residual tumors was significantly less in RFA + anti-CTLA-4 group than that of the other three groups (all p < 0.05). The disease control rate was 50% in RFA + anti-CTLA-4 group, while no animals in the other three groups showed disease control. Animals in RFA + anti-CTLA-4 group had longer survival times than those in the other three groups (all p < 0.05). Expression of CD4+ lymphocytes in residual tumors and IFN-γ production in response to H22 tumor cells were significantly higher in RFA + anti-CTLA-4 group than those in the other three groups (all p < 0.05). Three of the five survived mice in RFA + anti-CTLA-4 group underwent tumor re-challenge exhibited tumor rejection. CONCLUSIONS: The present study demonstrated that CTLA-4 blockade injection could suppress the growth of residual tumors and improve survival after insufficient RFA in a subcutaneous murine HCC model.


Assuntos
Antígeno CTLA-4/antagonistas & inibidores , Carcinoma Hepatocelular/cirurgia , Ablação por Cateter/métodos , Inibidores de Checkpoint Imunológico/uso terapêutico , Neoplasias Hepáticas/cirurgia , Neoplasias Experimentais , Animais , Carcinoma Hepatocelular/metabolismo , Carcinoma Hepatocelular/patologia , Progressão da Doença , Neoplasias Hepáticas/metabolismo , Neoplasias Hepáticas/patologia , Masculino , Camundongos , Camundongos Endogâmicos BALB C , Período Pós-Operatório
11.
Biomed Res Int ; 2020: 8851950, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33415166

RESUMO

OBJECTIVE: To explore the role of interventional radiology (IR) in the management of late postpancreaticoduodenectomy hemorrhage (PPH). MATERIALS AND METHODS: Patients who had late PPH (occurring >24 h after index operation) managed by the IR procedure in our institution between 2013 and 2018 were retrospectively analyzed. RESULT: Hired patients who were diagnosed with grade B (n = 10) and C (n = 22) late PPH underwent 40 transcatheter arterial angiographies (TAA). The overall positive rate of angiography was 45.0% (18/40). Eighteen transcatheter arterial embolizations (TAEs) were performed, and the technical success rate was 88.89% (16/18). The rebleeding rate after embolization was 18.8% (3/16), and no severe procedure-related complications were recorded. The overall mortality of late PPH was 25.0% (8/32). CONCLUSION: Nearly half of hemorrhagic sites in late PPH could be identified by TAA. TAE is an effective and safe method for the hemostasia of late PPH in patients with positive angiography results.


Assuntos
Hemorragia/diagnóstico por imagem , Hemorragia/etiologia , Pancreaticoduodenectomia/efeitos adversos , Radiologia Intervencionista , Adolescente , Adulto , Idoso , Angiografia , Procedimentos Endovasculares , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Adulto Jovem
12.
Thorac Cancer ; 9(9): 1194-1208, 2018 09.
Artigo em Inglês | MEDLINE | ID: mdl-30039918

RESUMO

Lung cancer ranks first in incidence and mortality in China. Surgery is the primary method to cure cancer, but only 20-30% of patients are eligible for curative resection. In recent years, in addition to surgery, other local therapies have been developed for patients with numerous localized primary and metastatic pulmonary tumors, including stereotactic body radiation therapy and thermal ablative therapies through percutaneously inserted applicators. Percutaneous thermal ablation of pulmonary tumors is minimally invasive, conformal, repeatable, feasible, cheap, has a shorter recovery time, and offers reduced morbidity and mortality. Radiofrequency ablation (RFA), the most commonly used thermal ablation technique, has a reported 80-90% rate of complete ablation, with the best results obtained in tumors < 3 cm in diameter. Because the clinical efficacy of RFA of pulmonary tumors has not yet been determined, this clinical guideline describes the techniques used in the treatment of localized primary and metastatic pulmonary tumors in nonsurgical candidates, including mechanism of action, devices, indications, techniques, potential complications, clinical outcomes, post-ablation surveillance, and use in combination with other therapies. In the future, the role of RFA in the treatment of localized pulmonary tumors should ultimately be determined by evidence from prospective randomized controlled trials comparing sublobar resection or stereotactic body radiation therapy.


Assuntos
Neoplasias Pulmonares/diagnóstico , Neoplasias Pulmonares/terapia , Ablação por Radiofrequência , Terapia Assistida por Computador , Humanos , Ablação por Radiofrequência/efeitos adversos , Ablação por Radiofrequência/métodos , Terapia Assistida por Computador/métodos
14.
Chin Med J (Engl) ; 125(18): 3217-322, 2012 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-22964312

RESUMO

BACKGROUND: It was still rare for the quantitative magnetic resonance imaging (MRI) research of regional changes in hippocampus sclerosis (HS) in Chinese patients with epilepsy. This study aimed to study the hippocampal volumes (HVs) with quantitative MRI measurement in Chinese patients with epilepsy. METHODS: Forty-six Chinese patients with epilepsy (intractable epilepsy (IE), n = 21; non-intractable epilepsy (NIE), n = 25) and 25 normal controls were collected between July 2007 and March 2008. All of the subjects underwent a 3T high-resolution MRI with oblique coronal thin sections oriented perpendicular to the hippocampal long axis. Hippocampal structures were assessed by visual detection, and HVs were quantitatively studied with a Picture Archiving and Communication System (PACS). RESULTS: Our study suggested that there was no significant difference in gender (P > 0.05) while the right hippocampal head volume (HHV), hippocampal body volume (HBV), and the whole hippocampal volume (HCV) were greater than the left one (P < 0.05), but no significant difference was found in bilateral hippocampal tail volume (HTV) (P > 0.05) in normal controls. That unilateral/diffuse (64%/21%) and bilateral/focal (86%/20%) hippocampal atrophy (HA) were significant in IE and NIE patients, respectively. Anterior hippocampus, especially HHV (26% in IE and 20% in NIE) and HBV (29% in IE and 12% in NIE), had more significant atrophy than the HTV (5% in IE and 0% in NIE) in patients with epilepsy. CONCLUSION: By assessing the volumes of the regional hippocampus with 3T MRI, we could better define the range and distribution of HS, since regional or subtle changes in HVs could be detected earlier with 3T MRI.


Assuntos
Epilepsia/diagnóstico , Hipocampo/patologia , Imageamento por Ressonância Magnética/métodos , Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Adulto Jovem
15.
J Comput Assist Tomogr ; 35(2): 167-73, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-21412085

RESUMO

PURPOSE: The objective of our study was to determine the usefulness of the diffusion-weighted magnetic resonance imaging and proton magnetic resonance spectroscopy (H-MRS) of hepatic malignancies for the assessment of response to locoregional treatment. METHODS: Forty-four patients (29 men; mean age, 58 years) with hepatic malignancies were treated locally. Magnetic resonance imaging examinations obtained before and at 1 and 6 months after transarterial chemoembolization were analyzed retrospectively. Imaging criteria included change in tumor size, percentage of enhancement in the arterial and portal venous phases, diffusion-weighted magnetic resonance imaging apparent diffusion coefficients, and choline concentration by quantitative H-MRS. Response to treatment was grouped according to RECIST (Response Evaluation Criteria in Solid Tumors) and European Association for the Study of the Liver (EASL) criteria based on magnetic resonance imaging at 6 months after treatment. Statistical analysis used paired t test, Fisher exact test, and univariate and multivariate Cox proportional hazards models. RESULTS: Before treatment, the median tumor diameter was 6 cm; at 6 months after treatment, median tumor diameter was 5.1 cm. According to RECIST and EASL, 66% of the patients achieved partial response, 31% had stable disease, and 3% of the patients showed progressive disease. One month after transarterial chemoembolization, apparent diffusion coefficient increased (P < 0.14), and mean choline concentration of the tumors decreased (P < 0.008). CONCLUSIONS: Diffusion-weighted imaging and hepatic choline levels by H-MRS could predict response to locoregional therapy.


Assuntos
Biomarcadores Tumorais/análise , Colina/análise , Imagem de Difusão por Ressonância Magnética/métodos , Neoplasias Hepáticas/diagnóstico , Neoplasias Hepáticas/terapia , Espectroscopia de Ressonância Magnética/métodos , Avaliação de Resultados em Cuidados de Saúde/métodos , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Prognóstico , Reprodutibilidade dos Testes , Sensibilidade e Especificidade , Resultado do Tratamento
16.
J Biochem ; 148(3): 263-71, 2010 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-20538716

RESUMO

Cell surface carbohydrate chains are widely known to contribute to cell migration, recognition and proliferation. beta1,4-Galactosyltransferase I (beta1,4GalT I) transfers galactose to the terminal N-acetylglucosamine of complex-type N-glycan, and contributes to cell proliferation, differentiation and migration. Here, we identified beta1,4GalT I as a novel target gene of cell cycle regulator E2F1. E2F1 proteins interact with the promoter of the beta1,4GalT I gene in vivo, and E2F1 over-expression stimulates the activity of beta1,4GalT I promoter and the mRNA and protein expression of beta1,4GalT I, and augments the level of beta1, 4-galactosyltion. Site-specific mutagenesis revealed that this region which contains two E2F1 binding site (nt -215 to -207 and +1 to +6) is necessary for beta1,4GalT I activation by E2F1. Furthermore, down-regulation of beta1,4GalT I expression attenuates E2F1-induced DNA synthesis and cell cycle progression as well as the expression of cell-cycle regulator Cyclin D1. Thus, beta1,4GalT I is an important E2F1 target gene that is required for cell cycle progression in mammalian cells, which elicits a new mechanism of cell growth and a new mechanism of beta1,4GalT I transcription.


Assuntos
Fator de Transcrição E2F1/genética , Galactosiltransferases/genética , Regiões Promotoras Genéticas , Sítios de Ligação , Ciclo Celular/genética , Processos de Crescimento Celular/genética , Linhagem Celular , Regulação da Expressão Gênica , Humanos
17.
Mol Cell Biol ; 27(24): 8770-82, 2007 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-17938207

RESUMO

Transcription factor E1AF is widely known to play critical roles in tumor metastasis via directly binding to the promoters of genes involved in tumor migration and invasion. Here, we report for the first time E1AF as a novel binding partner for ubiquitously expressed Sp1 transcription factor. E1AF forms a complex with Sp1, contributes to Sp1 phosphorylation and transcriptional activity, and functions as a mediator between epidermal growth factor and Sp1 phosphorylation and activity. Sp1 functions as a carrier bringing E1AF to the promoter region, thus activating transcription of glioma-related gene for beta1,4-galactosyltransferase V (GalT V; EC 2.4.1.38). Biologically, E1AF functions as a positive invasion regulator in glioma in cooperation with Sp1 partly via up-regulation of GalT V. This report describes a new mechanism of glioma invasion involving a cooperative effort between E1AF and Sp1 transcription factors.


Assuntos
Proteínas E1A de Adenovirus/metabolismo , Glioma/metabolismo , Glioma/patologia , Proteínas Proto-Oncogênicas/metabolismo , Fator de Transcrição Sp1/metabolismo , Proteínas E1A de Adenovirus/genética , Sequência de Bases , Linhagem Celular Tumoral , Movimento Celular/efeitos dos fármacos , Regulação para Baixo/efeitos dos fármacos , Fator de Crescimento Epidérmico/farmacologia , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Glioma/genética , Humanos , Dados de Sequência Molecular , Invasividade Neoplásica , Fosforilação/efeitos dos fármacos , Regiões Promotoras Genéticas/genética , Ligação Proteica/efeitos dos fármacos , Proteínas Proto-Oncogênicas/genética , Proteínas Proto-Oncogênicas c-ets , Ativação Transcricional/efeitos dos fármacos
18.
Mol Cell Biochem ; 304(1-2): 361-7, 2007 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-17557191

RESUMO

Previous study indicated that beta1,4-galactosyltransferase I (beta1,4GT1) was up-regulated by cycloheximide (CHX) and thus enhanced apoptosis induced by CHX in SMMC-7721 cells. In this study, we reported that constitutively active Akt protein (myr-Akt) inhibited CHX-induced apoptosis in SMMC-7721 cells through down-regulating beta1,4GT1. However, the two PI3K inhibitors LY294002 and wortmannin treatment up-regulated beta1,4GT1 through enhancing Sp1 protein expression and consequently increased CHX-induced SMMC-7721 cells apoptosis. Besides, our results suggested that beta1,4GT1 and cell surface galactose residues synthesized by elevated beta1,4GT1 played an important role in SMMC-7721 cells apoptosis treated with CHX and PI3K inhibitor together. Moreover, we found that CHX accentuated beta1,4GT1 through down-regulating Akt expression to mediate SMMC-7721 cells apoptosis. Taken together, PI3K inhibitors LY294002 and wortmannin up-regulated beta1,4GT1 and enhanced CHX-induced apoptosis in SMMC-7721 cells, which suggested that PI3K inhibitors might have therapeutic potential when combined with CHX in the treatment of hepatoma.


Assuntos
Androstadienos/farmacologia , Apoptose/efeitos dos fármacos , Carcinoma Hepatocelular/genética , Cromonas/farmacologia , Cicloeximida/farmacologia , Galactosiltransferases/genética , Neoplasias Hepáticas/genética , Morfolinas/farmacologia , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Carcinoma Hepatocelular/tratamento farmacológico , Linhagem Celular Tumoral , Avaliação Pré-Clínica de Medicamentos , Sinergismo Farmacológico , Galactosiltransferases/fisiologia , Regulação Enzimológica da Expressão Gênica/efeitos dos fármacos , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Humanos , Neoplasias Hepáticas/tratamento farmacológico , Fosfatidilinositol 3-Quinases , Especificidade por Substrato , Regulação para Cima/efeitos dos fármacos , Wortmanina
19.
Biochem Biophys Res Commun ; 358(1): 41-6, 2007 Jun 22.
Artigo em Inglês | MEDLINE | ID: mdl-17470362

RESUMO

beta1,4-Galactosyltransferase II (beta4GalT-II) is one of the enzymes transferring galactose to the terminal N-acetylglucosamine of complex-type N-glycans and its expression is significantly altered during oncogenesis with unknown functions. Here, we reported for the first time the pro-apoptotic role of beta4GalT-II in tumor cells. The level of beta4GalT-II mRNA expression was obviously decreased during HeLa cell apoptosis induced by cisplatin. Interestingly, the ectopic expression of beta4GalT-II in HeLa cells markedly increased apoptosis and cleavage of PARP induced by cisplatin as well as the expression of pro-apoptotic protein Bax. Furthermore, deletion of Golgi localization domain abolished the apoptotic role of beta4GalT-II in HeLa cells. Collectively, these results suggest that beta4GalT-II increases HeLa cell apoptosis induced by cisplatin depending on its Golgi localization, which indicates that beta4GalT-II might contribute to the therapeutic efficiency of cisplatin for cervix cancer.


Assuntos
Antineoplásicos/farmacologia , Apoptose/fisiologia , Cisplatino/farmacologia , Galactosiltransferases/metabolismo , Complexo de Golgi/enzimologia , Apoptose/efeitos dos fármacos , Colágeno Tipo XI/metabolismo , Galactosiltransferases/biossíntese , Galactosiltransferases/genética , Complexo de Golgi/efeitos dos fármacos , Células HeLa , Humanos , Mutação , RNA Mensageiro/biossíntese , Proteína X Associada a bcl-2/metabolismo
20.
Biochem Biophys Res Commun ; 358(1): 53-8, 2007 Jun 22.
Artigo em Inglês | MEDLINE | ID: mdl-17467662

RESUMO

E1AF transcription factor, a member of Ets family, is deregulated in many tumors and widely known to play critical roles in tumor metastasis via directly binding to the promoter of genes involved in tumor migration and invasion. Here, we found that E1AF overexpression promoted breast cancer cell cycle progression and growth in vivo as well as the transcription of cell cycle-related protein Cyclin D3. And, the interference of Cyclin D3 expression by transfecting with Cyclin D3 RNAi inhibited the positive role of E1AF in cell cycle progression. We further showed that decreasing the expression of E1AF by E1AF RNAi reduced Cyclin D3 transcription and expression, and inhibited cell cycle progression that was abrogated by Cyclin D3 overexpression. Taken together, E1AF increases cell cycle progression via upregulation of Cyclin D3 transcription, which elicits a new mechanism of breast cancer growth and a new mechanism of Cyclin D3 transcription.


Assuntos
Proteínas E1A de Adenovirus/fisiologia , Neoplasias da Mama/patologia , Ciclo Celular/fisiologia , Ciclinas/biossíntese , Proteínas Proto-Oncogênicas/fisiologia , Regulação para Cima , Animais , Neoplasias da Mama/metabolismo , Linhagem Celular Tumoral , Ciclina D3 , Feminino , Humanos , Camundongos , Transplante de Neoplasias , Proteínas Proto-Oncogênicas c-ets , Ensaios Antitumorais Modelo de Xenoenxerto
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