Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 13 de 13
Filtrar
Más filtros

Banco de datos
Tipo del documento
País de afiliación
Intervalo de año de publicación
1.
BMC Bioinformatics ; 24(1): 89, 2023 Mar 09.
Artículo en Inglés | MEDLINE | ID: mdl-36894886

RESUMEN

BACKGROUND: Hepatocellular carcinoma (HCC) has a high incidence and mortality worldwide, which seriously threatens people's physical and mental health. Coagulation is closely related to the occurrence and development of HCC. Whether coagulation-related genes (CRGs) can be used as prognostic markers for HCC remains to be investigated. METHODS: Firstly, we identified differentially expressed coagulation-related genes of HCC and control samples in the datasets GSE54236, GSE102079, TCGA-LIHC, and Genecards database. Then, univariate Cox regression analysis, LASSO regression analysis, and multivariate Cox regression analysis were used to determine the key CRGs and establish the coagulation-related risk score (CRRS) prognostic model in the TCGA-LIHC dataset. The predictive capability of the CRRS model was evaluated by Kaplan-Meier survival analysis and ROC analysis. External validation was performed in the ICGC-LIRI-JP dataset. Besides, combining risk score and age, gender, grade, and stage, a nomogram was constructed to quantify the survival probability. We further analyzed the correlation between risk score and functional enrichment, pathway, and tumor immune microenvironment. RESULTS: We identified 5 key CRGs (FLVCR1, CENPE, LCAT, CYP2C9, and NQO1) and constructed the CRRS prognostic model. The overall survival (OS) of the high-risk group was shorter than that of the low-risk group. The AUC values for 1 -, 3 -, and 5-year OS in the TCGA dataset were 0.769, 0.691, and 0.674, respectively. The Cox analysis showed that CRRS was an independent prognostic factor for HCC. A nomogram established with risk score, age, gender, grade, and stage, has a better prognostic value for HCC patients. In the high-risk group, CD4+T cells memory resting, NK cells activated, and B cells naive were significantly lower. The expression levels of immune checkpoint genes in the high-risk group were generally higher than that in the low-risk group. CONCLUSIONS: The CRRS model has reliable predictive value for the prognosis of HCC patients.


Asunto(s)
Carcinoma Hepatocelular , Neoplasias Hepáticas , Humanos , Pronóstico , Carcinoma Hepatocelular/genética , Neoplasias Hepáticas/genética , Nomogramas , Factores de Riesgo , Microambiente Tumoral
2.
EMBO J ; 34(21): 2671-85, 2015 Nov 03.
Artículo en Inglés | MEDLINE | ID: mdl-26346275

RESUMEN

Glucose metabolic reprogramming is a hallmark of cancer. Cancer cells rapidly adjust their energy source from oxidative phosphorylation to glycolytic metabolism in order to efficiently proliferate in a hypoxic environment, but the mechanism underlying this switch is still incompletely understood. Here, we report that hypoxia potently induces the RNA-binding protein HuR to specifically bind primary miR-199a transcript to block miR-199a maturation in hepatocellular carcinoma (HCC) cells. We demonstrate that this hypoxia-suppressed miR-199a plays a decisive role in limiting glycolysis in HCC cells by targeting hexokinase-2 (Hk2) and pyruvate kinase-M2 (Pkm2). Furthermore, systemically delivered cholesterol-modified agomiR-199a inhibits [(18)F]-fluorodeoxyglucose uptake and attenuates tumor growth in HCC tumor-bearing mice. These data reveal a novel mechanism of reprogramming of cancer energy metabolism in which HuR suppresses miR-199a maturation to link hypoxia to the Warburg effect and suggest a promising therapeutic strategy that targets miR-199a to interrupt cancerous aerobic glycolysis.


Asunto(s)
Carcinoma Hepatocelular/genética , Proteína 1 Similar a ELAV/fisiología , Regulación Neoplásica de la Expresión Génica , Neoplasias Hepáticas/genética , MicroARNs/genética , Animales , Secuencia de Bases , Carcinoma Hepatocelular/metabolismo , Proteínas Portadoras/genética , Proteínas Portadoras/metabolismo , Hipoxia de la Célula , Línea Celular Tumoral , Glucólisis , Hexoquinasa/genética , Hexoquinasa/metabolismo , Humanos , Neoplasias Hepáticas/metabolismo , Masculino , Proteínas de la Membrana/genética , Proteínas de la Membrana/metabolismo , Ratones Endogámicos BALB C , Ratones Desnudos , MicroARNs/metabolismo , Trasplante de Neoplasias , Unión Proteica , Hormonas Tiroideas/genética , Hormonas Tiroideas/metabolismo , Proteínas de Unión a Hormona Tiroide
3.
EMBO J ; 31(8): 1985-98, 2012 Apr 18.
Artículo en Inglés | MEDLINE | ID: mdl-22354042

RESUMEN

Cancer cells preferentially metabolize glucose through aerobic glycolysis. This phenomenon, known as the Warburg effect, is an anomalous characteristic of glucose metabolism in cancer cells. Chronic inflammation is a key promoting factor of tumourigenesis. It remains, however, largely unexplored whether and how pro-tumourigenic inflammation regulates glucose metabolism in cancer cells. Here, we show that pro-inflammatory cytokines promote glycolysis in breast cancer cells, and that the inflammation-induced miR-155 functions as an important mediator in this process. We further show that miR-155 acts to upregulate hexokinase 2 (hk2), through two distinct mechanisms. First, miR-155 promotes hk2 transcription by activation of signal transducer and activator of transcription 3 (STAT3), a transcriptional activator for hk2. Second, via targeting C/EBPß (a transcriptional activator for mir-143), miR-155 represses mir-143, a negative regulator of hk2, thus resulting in upregulation of hk2 expression at the post-transcriptional level. The miR-155-mediated hk2 upregulation also appears to operate in other types of cancer cells examined. We suggest that the miR-155/miR-143/HK2 axis may represent a common mechanism linking inflammation to the altered metabolism in cancer cells.


Asunto(s)
Glucólisis , Hexoquinasa/biosíntesis , MicroARNs/metabolismo , Animales , Neoplasias de la Mama/fisiopatología , Línea Celular Tumoral , Humanos , Ratones
4.
Sci Rep ; 14(1): 15811, 2024 07 09.
Artículo en Inglés | MEDLINE | ID: mdl-38982221

RESUMEN

The Microsoft Kinect depth sensor, with its built-in software that automatically captures joint coordinates without markers, could be a potential tool for ergonomic studies. This study investigates the performance of Kinect in limb segment lengths using dual-energy X-ray absorptiometry (DXA) as a reference. Healthy children and adults (n = 76) were recruited for limb length measurements by Kinect and DXA. The results showed consistent ratios of arm, forearm, thigh, and leg lengths to height, which were 0.16, 0.14, 0.23, and 0.22 respectively, for both age groups and methods. Kinect exhibited perfect correlation among all limb lengths, indicating fixed proportions assumed by its algorithm. Comparing the two methods, there was a strong correlation (R = 0.850-0.985) and good to excellent agreement (ICC = 0.829-0.977), except for the right leg in adults, where agreement was slightly lower but still moderate (ICC = 0.712). The measurement bias between the methods ranged from - 1.455 to 0.536 cm. In conclusion, Kinect yields outcomes similar to DXA, indicating its potential utility as a tool for ergonomic studies. However, the built-in algorithm of Kinect assumes fixed limb proportions for individuals, which may not be ideal for studies focusing on investigating limb discrepancies or anatomical differences.


Asunto(s)
Absorciometría de Fotón , Humanos , Adulto , Masculino , Niño , Femenino , Absorciometría de Fotón/métodos , Adulto Joven , Algoritmos , Programas Informáticos , Adolescente , Persona de Mediana Edad , Antropometría/métodos
5.
EMBO J ; 28(18): 2719-32, 2009 Sep 16.
Artículo en Inglés | MEDLINE | ID: mdl-19696742

RESUMEN

We here report that miR-17-92 cluster is a novel target for p53-mediated transcriptional repression under hypoxia. We found the expression levels of miR-17-92 cluster were reduced in hypoxia-treated cells containing wild-type p53, but were unchanged in hypoxia-treated p53-deficient cells. The repression of miR-17-92 cluster under hypoxia is independent of c-Myc. Luciferase reporter assays mapped the region responding to p53-mediated repression to a p53-binding site in the proximal region of the miR-17-92 promoter. Chromatin immunoprecipitation (ChIP), Re-ChIP and gel retardation assays revealed that the binding sites for p53- and the TATA-binding protein (TBP) overlap within the miR-17-92 promoter; these proteins were found to compete for binding. Finally, we show that pri-miR-17-92 expression correlated well with p53 status in colorectal carcinomas. Over-express miR-17-92 cluster markedly inhibits hypoxia-induced apoptosis, whereas blocked miR-17-5p and miR-20a sensitize the cells to hypoxia-induced apoptosis. These data indicated that p53-mediated repression of miR-17-92 expression likely has an important function in hypoxia-induced apoptosis, and thus further our understanding of the tumour suppressive function of p53.


Asunto(s)
Apoptosis , MicroARNs/genética , Familia de Multigenes , Proteína p53 Supresora de Tumor/genética , Sitios de Unión , Células CACO-2 , Línea Celular Tumoral , Inmunoprecipitación de Cromatina , Humanos , Hipoxia , Cinética , Luciferasas/metabolismo , Modelos Biológicos , Regiones Promotoras Genéticas , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa
6.
BMC Genomics ; 13: 232, 2012 Jun 12.
Artículo en Inglés | MEDLINE | ID: mdl-22691069

RESUMEN

BACKGROUND: The morphogenesis of the cerebral cortex depends on the precise control of gene expression during development. Small non-coding RNAs, including microRNAs and other groups of small RNAs, play profound roles in various physiological and pathological processes via their regulation of gene expression. A systematic analysis of the expression profile of small non-coding RNAs in developing cortical tissues is important for clarifying the gene regulation networks mediating key developmental events during cortical morphogenesis. RESULTS: Global profiling of the small RNA transcriptome was carried out in rat cerebral cortex from E10 till P28 using next-generation sequencing technique. We found an extraordinary degree of developmental stage-specific expression of a large group of microRNAs. A group of novel microRNAs with functional hints were identified, and brain-enriched expression and Dicer-dependent production of high-abundant novel microRNAs were validated. Profound editing of known microRNAs at "seed" sequence and flanking sequence was observed, with much higher editing events detected at late postnatal stages than embryonic stages, suggesting the necessity of microRNA editing for the fine tuning of gene expression during the formation of complicated synaptic connections at postnatal stages. CONCLUSION: Our analysis reveals extensive regulation of microRNAs during cortical development. The dataset described here will be a valuable resource for clarifying new regulatory mechanisms for cortical development and diseases and will greatly contribute to our understanding of the divergence, modification, and function of microRNAs.


Asunto(s)
Corteza Cerebral/embriología , Perfilación de la Expresión Génica , Regulación del Desarrollo de la Expresión Génica , MicroARNs/metabolismo , Animales , Análisis por Conglomerados , Ratas , Ratas Sprague-Dawley , Análisis de Secuencia de ARN
7.
Urol Int ; 89(4): 425-32, 2012.
Artículo en Inglés | MEDLINE | ID: mdl-23075831

RESUMEN

PURPOSE: To investigate the optimal schemes of prostate biopsy according to prostate volume (PV), age and transrectal ultrasound (TRUS) status in Chinese men. METHODS: 923 consecutive patients who underwent initial TRUS-guided systematic 12-core prostate biopsy (12PBx) were enrolled in this study. The 12PBx was obtained by overlapping of conventional sextant, lateral base, mid-gland of peripheral zone and apex. Each sample was individually marked and inked before fixation. Patients were divided into 8 subgroups on the basis of independent risk factors investigated using logistic regression model. Subsequently, 12PBx was defined as self-control for the analysis of biopsy schemes (6-, 8- and 10PBx) on individual core basis. The prostate cancer detection rates (CDRs) of 6-, 8-, 10- and 12PBx were compared for each individual subgroup. RESULTS: The 12PBx detected 253 (27.4%) cases of prostate cancer (PCa), of which 67.2, 47.1 and 61.3% were located in the base, mid-gland and apex, respectively. Multivariate analysis indicated that age, TRUS status and PV were independent risk factors for PCa detection. CDR increased with increasing biopsy cores. However, for patients with age ≥65 years, positive TRUS and PV <38.5 cm(3), CDR of 8PBx (30.6%) was similar to 10PBx (32.2%) and 12PBx (32.2%); for patients with age ≥65 years, negative TRUS and PV <38.5 cm(3) or ones with age ≥65 years, positive TRUS and PV ≥38.5 cm(3), 10PBx was as effective as 12PBx in detecting PCa (27.8, 27.5 vs. 28.9, 29.3%, respectively). CONCLUSION: Age, TRUS status and PV were independent risk factors for PCa detection. Traditional sextant biopsy is not recommended. 8-, 10-, or 12PBx as an individual biopsy scheme might be adopted according to these risk factors for Chinese patients.


Asunto(s)
Próstata/patología , Anciano , Anciano de 80 o más Años , Pueblo Asiatico , Biopsia con Aguja/métodos , Humanos , Biopsia Guiada por Imagen , Masculino , Persona de Mediana Edad , Próstata/diagnóstico por imagen , Ultrasonografía Intervencional
8.
Front Neurol ; 13: 1014346, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-36545400

RESUMEN

Background: The incidence, prevalence, and mortality of ischemic stroke (IS) continue to rise, resulting in a serious global disease burden. The prediction models have a great value in the early prediction and diagnosis of IS. Methods: The R software was used to screen the differentially expressed genes (DEGs) of IS and control samples in the datasets GSE16561, GSE58294, and GSE37587 and analyze DEGs for enrichment analysis. The feature genes of IS were obtained by several machine learning algorithms, including the least absolute shrinkage and selector operation (LASSO) logistic regression, the support vector machine-recursive feature elimination (SVM-RFE), and the Random Forest (RF). The IS diagnostic models were constructed based on transcriptomics by machine learning and artificial neural network (ANN). Results: A total of 69 DEGs, mainly involved in immune and inflammatory responses, were identified. The pathways enriched in the IS group were complement and coagulation cascades, lysosome, PPAR signaling pathway, regulation of autophagy, and toll-like receptor signaling pathway. The feature genes selected by LASSO, SVM-RFE, and RF were 17, 10, and 12, respectively. The area under the curve (AUC) of the LASSO model in the training dataset, GSE22255, and GSE195442 was 0.969, 0.890, and 1.000. The AUC of the SVM-RFE model was 0.957, 0.805, and 1.000, respectively. The AUC of the RF model was 0.947, 0.935, and 1.000, respectively. The models have good sensitivity, specificity, and accuracy. The AUC of the LASSO+ANN, SVM-RFE+ANN, and RF+ANN models was 1.000, 0.995, and 0.997, respectively, in the training dataset. However, the AUC of LASSO+ANN, SVM-RFE+ANN, and RF+ANN models was 0.688, 0.605, and 0.619, respectively, in the GSE22255 dataset. The AUC of the LASSO+ANN and RF+ANN models was 0.740 and 0.630, respectively, in the GSE195442 dataset. In the training dataset, the sensitivity, specificity, and accuracy of the LASSO+ANN model were 1.000, 1.000, and 1.000, respectively; of the SVM-RFE+ANN model were 0.946, 0.982, and 0.964, respectively; and of the RF+ANN model were 0.964, 1.000, and 0.982, respectively. In the test datasets, the sensitivity was very satisfactory; however, the specificity and accuracy were not good. Conclusion: The LASSO, SVM-RFE, and RF models have good prediction abilities. However, the ANN model is efficient at classifying positive samples and is unsuitable at classifying negative samples.

9.
Zhonghua Yi Xue Za Zhi ; 88(44): 3141-4, 2008 Dec 02.
Artículo en Zh | MEDLINE | ID: mdl-19159599

RESUMEN

OBJECTIVE: To summarize the experience in diagnosis and treatment of pulmonary hypertension caused by sleep hypoventilation. METHODS: The clinical data of 4 patients in a family with pulmonary hypertension caused by sleep hypoventilation, full brothers and sisters, 2 (Cases 1 and 2) being treated presently and 2 (Cases 3 and 4) being deceased and traced by family medical history, were retrospectively analyzed. RESULTS: Three of the 4 cases (cases 1, 3, and 4) were misdiagnosed as with cor pulmonale combined with pulmonary hypertension, and one case (case 2) was misdiagnosed as with primary pulmonary hypertension. Polysomnography (PSG) revealed alveolar hypoventilation-induced long period of oxygen desaturation at sleep in Cases 1 and 2, thus confirming the diagnosis. Pulmonary function test showed that the percentage of maximum inspiratory pressure (PImax) in predicted value (51.5% and 20.9%) and the maximum expiratory pressure (PEmax) in predicted value (51.3% and 29.6%) decreased, the percentage of mouth occlusion pressure (P0.1) in predicted value (141% and 133%) compensatively increased, and the respiratory muscle strength decreased in Cases 1 and 2, which suggested that there was neuromuscular disorder in these patients. Treated by noninvasive ventilation the symptoms of these 2 patients were improved and they were discharge at last. Subsequently, they were treated by long-term night noninvasive ventilation at home, and returned to normal work and life. During the follow-up for 22 and 12 months respectively after discharge, PSG showed that the alveolar hypoventilation-induced long period oxygen desaturation at sleep had been greatly improved, and echocardiogram showed that the pulmonary pressure was greatly decreased. CONCLUSION: For the patients with unexplained pulmonary hypertension, PSG monitoring and pulmonary function tests such as PImax, PEmax, and P0.1 help determine the etiology, and long-term night noninvasive ventilation at home can improve the outcome of sleep hypoventilation-induced pulmonary hypertension.


Asunto(s)
Hipertensión Pulmonar/etiología , Hipoventilación/complicaciones , Sueño , Femenino , Humanos , Hipertensión Pulmonar/diagnóstico , Hipertensión Pulmonar/genética , Hipoventilación/diagnóstico , Hipoventilación/genética , Masculino , Persona de Mediana Edad , Linaje , Estudios Retrospectivos
10.
Zhonghua Jie He He Hu Xi Za Zhi ; 29(5): 320-3, 2006 May.
Artículo en Zh | MEDLINE | ID: mdl-16759490

RESUMEN

OBJECTIVE: To investigate the perioperative management, recipient selection of end-stage lung diseases dependent on ventilator, and the strategy of ventilator weaning. METHODS: Fifteen patients underwent lung transplantation in our hospital from 2002 to 2005. Of them, three were dependent on ventilator for 89, 120 and 107 days respectively because of end-stage pulmonary emphysema before operation. Single-lung transplantation was performed in one patient and sequential bilateral single-lung transplantations were performed in two patients without extracorporeal circulation. RESULTS: The three patients were weaned from ventilator in the sixth, eleventh and twenty second day respectively after operation. They were discharged from hospital 71 d, 41 d, and 67 d respectively after operation. They had been followed up for 22, 4, and 2 months respectively before this analysis. Their quality of life improved significantly. CONCLUSION: Lung transplantation is effective for the treatment of ventilator dependent end-stage lung diseases.


Asunto(s)
Trasplante de Pulmón , Enfermedad Pulmonar Obstructiva Crónica/cirugía , Ventiladores Mecánicos/efectos adversos , Humanos , Masculino , Persona de Mediana Edad
12.
Urology ; 76(4): 815-20, 2010 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-20579695

RESUMEN

OBJECTIVES: To compare the clinical value of single B-mode ultrasonography and B-mode combined with color Doppler ultrasonography in the guidance of mini-invasive percutaneous nephrolithotomy (m-PCNL) to decrease the incidence of hemorrhagic complications. METHODS: A total of 297 patients with renal stones who had undergone m-PCNL were retrospectively categorized into 2 groups. Group 1 (187 patients) underwent m-PCNL with single B-mode ultrasound guidance and group 2 (110 patients) underwent m-PCNL with combined B-mode and color Doppler ultrasound guidance. The clinical characteristics of the patients, intraoperative and postoperative characteristics, complications, especially hemorrhagic complications, and blood transfusion rate were recorded and compared. RESULTS: No statistically significant differences in age, height, weight, stone burden, operative time, stone-free rate, or length of postoperative hospital stay were found between the 2 groups. In group 2, a statistically significant decrease in the transfusion rate was found compared with group 1 (P <.05). In group 1, 5 patients (2.6%) required a blood transfusion, 2 (1.1%) developed a renal arteriovenous fistula and required embolotherapy, 2 (1.1%) developed hemorrhage and required embolotherapy after surgery, 16 (8.6%) developed capillary hemorrhage during surgery but had no hemorrhage postoperatively. However, no serious hemorrhagic complications were found in group 2. Only 3 patients (2.7%) developed capillary hemorrhage during surgery, and no hemorrhage occurred postoperatively. CONCLUSIONS: Using combined B-mode and color Doppler ultrasound guidance during in m-PCNL resulted in the real-time detection and avoidance of the renal blood vessels during puncture and decreased the incidence of hemorrhagic complications, especially in the patients with a solitary and compensative kidney.


Asunto(s)
Pérdida de Sangre Quirúrgica/prevención & control , Nefrolitiasis/cirugía , Nefrostomía Percutánea/métodos , Hemorragia Posoperatoria/prevención & control , Cirugía Asistida por Computador/métodos , Ultrasonografía Doppler en Color , Ultrasonografía Intervencional/métodos , Cálculos Ureterales/cirugía , Adolescente , Adulto , Anciano , Femenino , Hematuria/epidemiología , Humanos , Masculino , Persona de Mediana Edad , Procedimientos Quirúrgicos Mínimamente Invasivos , Complicaciones Posoperatorias/epidemiología , Estudios Retrospectivos , Resultado del Tratamiento , Adulto Joven
13.
Cancer Res ; 70(8): 3119-27, 2010 Apr 15.
Artículo en Inglés | MEDLINE | ID: mdl-20354188

RESUMEN

MicroRNA-155 (miR-155) is overexpressed in many human cancers; however, the mechanisms by which miR-155 functions as a putative oncomiR are largely unknown. Here, we report that the tumor suppressor gene suppressor of cytokine signaling 1 (socs1) is an evolutionarily conserved target of miR-155 in breast cancer cells. We found that mir-155 expression is inversely correlated with socs1 expression in breast cancer cell lines as well as in a subset of primary breast tumors. We also identified a 24A-->G mutation in the miR-155 binding site of the SOCS1 3' untranslated region in a breast tumor that reduced miR-155 repression, implicating a mechanism for miRNA targets to avoid repression. Ectopic expression of miR-155 significantly promoted the proliferation of breast cancer cells, the formation of soft agar foci in vitro, and the development of tumors in nude mice. In breast cancer cells, RNA interference silencing of socs1 recapitulates the oncogenic effects of miR-155, whereas restoration of socs1 expression attenuates the protumorigenesis function of miR-155, suggesting that miR-155 exerts its oncogenic role by negatively regulating socs1. Overexpression of miR-155 in breast cancer cells leads to constitutive activation of signal transducer and activator of transcription 3 (STAT3) through the Janus-activated kinase (JAK) pathway, and stimulation of breast cancer cells by the inflammatory cytokines IFN-gamma and interleukin-6 (IL-6), lipopolysaccharide (LPS), and polyriboinosinic:polyribocytidylic acid [poly(I:C)] significantly upregulates mir-155 expression, suggesting that miR-155 may serve as a bridge between inflammation and cancer. Taken together, our study reveals that miR-155 is an oncomiR in breast cancer and that miR-155 may be a potential target in breast cancer therapy.


Asunto(s)
Neoplasias de la Mama/metabolismo , Regulación Enzimológica de la Expresión Génica , Regulación Neoplásica de la Expresión Génica , MicroARNs/fisiología , Proteínas Supresoras de la Señalización de Citocinas/metabolismo , Línea Celular , Línea Celular Tumoral , Proliferación Celular , Proteínas Fluorescentes Verdes/química , Humanos , Janus Quinasa 2/metabolismo , MicroARNs/metabolismo , Mutación , Oligonucleótidos/química , Factor de Transcripción STAT3/metabolismo , Proteína 1 Supresora de la Señalización de Citocinas , Regulación hacia Arriba
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA