Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 109
Filtrar
Más filtros

Banco de datos
País/Región como asunto
Tipo del documento
Intervalo de año de publicación
1.
Ecotoxicol Environ Saf ; 283: 116842, 2024 Sep 15.
Artículo en Inglés | MEDLINE | ID: mdl-39106568

RESUMEN

Numerous studies have highlighted the correlation between metal intake and deteriorated pulmonary function, emphasizing its pivotal role in the progression of Chronic Obstructive Pulmonary Disease (COPD). However, the efficacy of traditional models is often compromised due to overfitting and high bias in datasets with low-level exposure, rendering them ineffective in delineating the contemporary risk trends associated with pulmonary diseases. To address these limitations, we embarked on developing advanced, interpretable models, crucial for elucidating the intricate mechanisms of metal toxicity and enriching the domain knowledge embedded in toxicity models. In this endeavor, we scrutinized extensive, long-term metal exposure datasets from NHANES to explore the interplay between metal and pulmonary functionality. Employing a variety of machine-learning approaches, we opted for the "Mixer of Experts" model for its proficiency in identifying a myriad of toxicological trends and sensitivities. We conceptualized and illustrated the TSAP (Toxicity Score at Population-level), a metal interpretable scoring system offering performance nearly equivalent to the amalgamation of standard interpretable methods addressing the "black box" conundrum. This streamlined, bifurcated procedural analysis proved instrumental in discerning established risk factors, thereby uncovering Tungsten as a novel contributor to COPD risk. SYNOPSIS: TSAP achieved satisfied performance with transparent interpretability, suggesting tungsten intake need further action for COPD prevention.


Asunto(s)
Enfermedad Pulmonar Obstructiva Crónica , Tungsteno , Enfermedad Pulmonar Obstructiva Crónica/inducido químicamente , Tungsteno/toxicidad , Tungsteno/efectos adversos , Humanos , Factores de Riesgo , Medición de Riesgo , Encuestas Nutricionales , Exposición a Riesgos Ambientales/efectos adversos , Exposición a Riesgos Ambientales/estadística & datos numéricos , Aprendizaje Automático , Metales/toxicidad
2.
Funct Integr Genomics ; 23(2): 79, 2023 Mar 08.
Artículo en Inglés | MEDLINE | ID: mdl-36882550

RESUMEN

As a well-known behavioral risk factor for human health, smoking is involved in carcinogenesis, tumor progression, and therapeutic interventions of head and neck squamous cell carcinoma (HNSCC). The stratification of disease subtypes according to tobacco use is expressively needed for HNSCC precision therapy. High-throughput transcriptome profiling by RNA sequencing (RNA-seq) from The Cancer Genome Atlas (TCGA) was collected and collated for differential expression analysis and pathway enrichment analysis to characterize the molecular landscape for non-smoking HNSCC patients. Molecular prognostic signatures specific to non-smoking HNSCC patients were identified by the least absolute shrinkage and selection operator (LASSO) analysis and were then verified via internal and external validation cohorts. While proceeding to immune cell infiltration and after drug sensitivity analysis was further carried out, a proprietary nomogram was finally developed for their respective clinical applications. In what it relates to the non-smoking cohort, the enrichment analysis pointed to human papillomavirus (HPV) infection and PI3K-Akt signaling pathway, with the prognostic signature consisting of another ten prognostic genes (COL22A1, ADIPOQ, RAG1, GREM1, APBA2, SPINK9, SPP1, ARMC4, C6, and F2RL2). These signatures showed to be independent factors, and the related nomograms were, thus, constructed for their further and respective clinical applications. While the molecular landscapes and proprietary prognostic signature were characterized based on non-smoking HNSCC patients, a clinical nomogram was constructed to provide better HNSCC patient classification and guide treatment for non-smoking HNSCC patients. Nonetheless, there are still significant challenges in the recognition, diagnosis, treatment, and understanding of the potentially efficient mechanisms of HNSCC with no tobacco use.


Asunto(s)
Neoplasias de Cabeza y Cuello , Carcinoma de Células Escamosas de Cabeza y Cuello , Transcriptoma , Humanos , Neoplasias de Cabeza y Cuello/diagnóstico , Neoplasias de Cabeza y Cuello/genética , Fosfatidilinositol 3-Quinasas/genética , Pronóstico , Carcinoma de Células Escamosas de Cabeza y Cuello/diagnóstico , Carcinoma de Células Escamosas de Cabeza y Cuello/genética
3.
J Gene Med ; 25(7): e3495, 2023 07.
Artículo en Inglés | MEDLINE | ID: mdl-36894497

RESUMEN

Immunogenic cell death (ICD) is one of the mechanisms regulating cell death, which activates adaptive immunity in immunocompetent hosts and is associated with tumor progression, prognosis and therapeutic response. Endometrial cancer (EC) is one of the most common malignancies of the female genital tract, and the potential role of immunogenic cell death-related genes (IRGs) in the tumor microenvironment (TME) remains unclear. We describe the variation of IRGs and assess the expression patterns in EC samples from The Cancer Genome Atlas and Gene Expression Omnibus cohorts. Based on the expression of 34 IRGs, we identified two different ICD-related clusters and subsequently differentially expressed genes between the two ICD-related clusters were used for the identification of two ICD gene clusters. We identified the clusters and found that alterations in the multilayer IRG were associated with patient prognosis and TME cell infiltration characteristics. On this basis, ICD score risk scores were calculated, and ICD signatures were constructed and validated for their predictive power in EC patients. To help clinicians better apply the ICD signature, an accurate nomogram was constructed. The low ICD risk group was characterized by high microsatellite instability, high tumor mutational load, high IPS score and stronger immune activation. Our comprehensive analysis of IRGs in EC patients suggested a potential role in the tumor immune interstitial microenvironment, clinicopathological features and prognosis. These findings may improve our understanding of the role of ICDs, and provide a new basis for assessing prognosis and developing more effective immunotherapeutic strategies in EC.


Asunto(s)
Neoplasias Endometriales , Muerte Celular Inmunogénica , Humanos , Femenino , Microambiente Tumoral/genética , Neoplasias Endometriales/genética , Familia de Multigenes , Mutación
4.
Gut ; 69(4): 630-640, 2020 04.
Artículo en Inglés | MEDLINE | ID: mdl-31409603

RESUMEN

OBJECTIVE: While oesophageal squamous cell carcinoma remains infrequent in Western populations, the incidence of oesophageal adenocarcinoma (EAC) has increased sixfold to eightfold over the past four decades. We aimed to characterise oesophageal cancer-specific and subtypes-specific gene regulation patterns and their upstream transcription factors (TFs). DESIGN: To identify regulatory elements, we profiled fresh-frozen oesophageal normal samples, tumours and cell lines with chromatin immunoprecipitation sequencing (ChIP-Seq). Mathematical modelling was performed to establish (super)-enhancers landscapes and interconnected transcriptional circuitry formed by master TFs. Coregulation and cooperation between master TFs were investigated by ChIP-Seq, circularised chromosome conformation capture sequencing and luciferase assay. Biological functions of candidate factors were evaluated both in vitro and in vivo. RESULTS: We found widespread and pervasive alterations of the (super)-enhancer reservoir in both subtypes of oesophageal cancer, leading to transcriptional activation of a myriad of novel oncogenes and signalling pathways, some of which may be exploited pharmacologically (eg, leukemia inhibitory factor (LIF) pathway). Focusing on EAC, we bioinformatically reconstructed and functionally validated an interconnected circuitry formed by four master TFs-ELF3, KLF5, GATA6 and EHF-which promoted each other's expression by interacting with each super-enhancer. Downstream, these master TFs occupied almost all EAC super-enhancers and cooperatively orchestrated EAC transcriptome. Each TF within the transcriptional circuitry was highly and specifically expressed in EAC and functionally promoted EAC cell proliferation and survival. CONCLUSIONS: By establishing cancer-specific and subtype-specific features of the EAC epigenome, our findings promise to transform understanding of the transcriptional dysregulation and addiction of EAC, while providing molecular clues to develop novel therapeutic modalities against this malignancy.


Asunto(s)
Adenocarcinoma/genética , Neoplasias Esofágicas/genética , Carcinoma de Células Escamosas de Esófago/genética , Redes Reguladoras de Genes/fisiología , Factores de Transcripción/genética , Adenocarcinoma/patología , Estudios de Casos y Controles , Línea Celular Tumoral , Proliferación Celular , Proteínas de Unión al ADN/genética , Neoplasias Esofágicas/patología , Carcinoma de Células Escamosas de Esófago/patología , Factor de Transcripción GATA6/genética , Humanos , Factores de Transcripción de Tipo Kruppel/genética , Proteínas Proto-Oncogénicas c-ets/genética
5.
J Cell Physiol ; 235(9): 6218-6229, 2020 09.
Artículo en Inglés | MEDLINE | ID: mdl-32091625

RESUMEN

Although great progress has been made in surgical techniques, traditional radiotherapy, and chemotherapy, gastric cancer (GC) is still the most common malignant tumor and has a high mortality, which highlights the importance of novel diagnostic markers. Emerging studies suggest that different microRNAs (miRNAs) are involved in tumorigenesis of GC. In this study, we found that miRNA-192 and -215 are significantly upregulated in GC and promote cell proliferation and migration. Adenomatous polyposis coli (APC), a well-known negative regulator in Wnt signaling, has been proved to be a target of miRNA-192 and -215. Inhibition of miRNA-192 or -215 reduced the Topflash activities and repressed the expression of Wnt signaling pathway proteins, while APC small interfering RNAs reversed the inhibitory effects, suggesting that miRNA-192 and -215 activate Wnt signaling via APC. In addition, APC mediates the cell proliferation and migration regulated by miRNA-192 and -215. Furthermore, APC is downregulated in GC tissues and negatively correlated with the expression of miRNA-192 and -215. In summary, miRNA-192 and -215 target APC and function as oncogenic miRNAs by activating Wnt signaling in GC, revealing to be potential therapeutic targets.


Asunto(s)
Proteína de la Poliposis Adenomatosa del Colon/genética , MicroARNs/genética , Neoplasias Gástricas/genética , Línea Celular Tumoral , Movimiento Celular/genética , Proliferación Celular/genética , Femenino , Regulación Neoplásica de la Expresión Génica/genética , Humanos , Masculino , Neoplasias Gástricas/patología , Vía de Señalización Wnt
6.
Gen Comp Endocrinol ; 287: 113347, 2020 02 01.
Artículo en Inglés | MEDLINE | ID: mdl-31794730

RESUMEN

Many marine invertebrate larvae undergo a dramatic morphological and physiological transition from a planktonic larva to a benthic juvenile. The mechanisms of this metamorphosis in bivalves are mainly unknown. The recent identification in bivalves of a thyroid hormone receptor (TR) gene raises the possibility that as occurs in vertebrate metamorphosis, TRs regulate this developmental process. An evolutionary study of TR receptors revealed they are ubiquitous in the molluscs. Knock-down of the TR gene in pediveliger larvae of the hard-shelled mussel, Mytilus coruscus (Mc), using electroporation of siRNA significantly (p < 0.01) reduced TR gene expression. TR gene knock-down decreased pediveliger larval metamorphosis by 54% and was associated with a significant (p < 0.01) reduction in viability compared to control larvae. The TR in the hard-shelled mussel appears to be an essential regulatory factor for the successful epinephrine-induced metamorphosis of the pediveliger larvae to post-larvae. It is hypothesised that the knock-down of TR by siRNA transfection affects the "competence" of pediveliger larvae for the metamorphic transition by reducing their ability to respond to the inducer. The involvement of TR in the epinephrine-induced metamorphosis of a mollusc, the hard-shelled mussel, suggests the role of TR in this process probably emerged early during evolution.


Asunto(s)
Epinefrina/efectos adversos , Larva/metabolismo , Metamorfosis Biológica/fisiología , Mytilus , Receptores de Hormona Tiroidea/metabolismo , Animales , Transfección
7.
Lab Invest ; 99(10): 1442-1453, 2019 10.
Artículo en Inglés | MEDLINE | ID: mdl-31217510

RESUMEN

MicroRNAs (miRs) are post-transcriptional regulators involved in the initiation and progression of many tumors. Recently, naturally occurring circular RNAs (circRNAs) have been described in eukaryotic cells:;they comprise a new class of gene regulators. Naturally occurring circular miR sponges, which induce miR loss-of-function, can prevent endogenous onco-miRs from binding to their cognate mRNA targets. These findings suggest that synthetic (artificial) circular RNAs could be constructed as therapeutic molecular sponges to suppress harmful onco-miRs. Using enzymatic ligation, we designed and constructed a circular RNA containing both miR-21 and miR-93 binding sites. The synthetic circular sponge was resistant to digestion with RNase R. Luciferase assays and functional experiments showed that the circular multi-miR sponge was more stable than its linear counterpart. Moreover, endogenous miR-21 and miR-93 were inhibited by the circular sponge. In addition, the synthetic sponge significantly suppressed cellular proliferation and migration while promoting apoptosis in esophageal carcinoma cells. Finally, in a murine xenograft model, the circular sponge significantly inhibited tumor growth in vivo. Taken together, these findings establish that the design and construction of efficient artificial miR sponges represent a novel strategy to achieve miR loss-of-function in molecular cancer therapeutics.


Asunto(s)
Carcinoma/tratamiento farmacológico , Neoplasias Esofágicas/tratamiento farmacológico , MicroARNs/antagonistas & inhibidores , ARN Circular/uso terapéutico , Animales , Línea Celular Tumoral , Femenino , Humanos , Ratones Desnudos , ARN Circular/farmacología , Ensayos Antitumor por Modelo de Xenoinjerto
11.
Proc Natl Acad Sci U S A ; 112(35): E4894-900, 2015 Sep 01.
Artículo en Inglés | MEDLINE | ID: mdl-26283398

RESUMEN

Barrett's esophagus (BE) is a common disease in which the lining of the esophagus transitions from stratified squamous epithelium to metaplastic columnar epithelium that predisposes individuals to developing esophageal adenocarcinoma (EAC). We hypothesized that BE provides a unique environment for increased long-interspersed element 1 (LINE-1 or L1) retrotransposition. To this end, we evaluated 5 patients with benign BE, 5 patients with BE and concomitant EAC, and 10 additional patients with EAC to determine L1 activity in this progressive disease. After L1-seq, we confirmed 118 somatic insertions by PCR in 10 of 20 individuals. We observed clonal amplification of several insertions which appeared to originate in normal esophagus (NE) or BE and were later clonally expanded in BE or in EAC. Additionally, we observed evidence of clonality within the EAC cases; specifically, 22 of 25 EAC-only insertions were present identically in distinct regions available from the same tumor, suggesting that these insertions occurred in the founding tumor cell of these lesions. L1 proteins must be expressed for retrotransposition to occur; therefore, we evaluated the expression of open reading frame 1 protein (ORF1p), a protein encoded by L1, in eight of the EAC cases for which formalin-fixed paraffin embedded tissue was available. With immunohistochemistry, we detected ORF1p in all tumors evaluated. Interestingly, we also observed dim ORF1p immunoreactivity in histologically NE of all patients. In summary, our data show that somatic retrotransposition occurs early in many patients with BE and EAC and indicate that early events occurring even in histologically NE cells may be clonally expanded in esophageal adenocarcinogenesis.


Asunto(s)
Adenocarcinoma/genética , Esófago de Barrett/genética , Neoplasias Esofágicas/genética , Elementos de Nucleótido Esparcido Largo/genética , Retroelementos , Secuencia de Bases , ADN , Humanos , Datos de Secuencia Molecular
12.
Cancer ; 123(20): 3916-3924, 2017 Oct 15.
Artículo en Inglés | MEDLINE | ID: mdl-28640357

RESUMEN

BACKGROUND: Studies of chromosomal rearrangements and fusion transcripts have elucidated mechanisms of tumorigenesis and led to targeted cancer therapies. This study was aimed at identifying novel fusion transcripts in esophageal adenocarcinoma (EAC). METHODS: To identify new fusion transcripts associated with EAC, targeted RNA sequencing and polymerase chain reaction (PCR) verification were performed in 40 EACs and matched nonmalignant specimens from the same patients. Genomic PCR and Sanger sequencing were performed to find the breakpoint of fusion genes. RESULTS: Five novel in-frame fusion transcripts were identified and verified in 40 EACs and in a validation cohort of 15 additional EACs (55 patients in all): fibroblast growth factor receptor 2 (FGFR2)-GRB2-associated binding protein 2 (GAB2) in 2 of 55 or 3.6%, Niemann-Pick C1 (NPC1)-maternal embryonic leucine zipper kinase (MELK) in 2 of 55 or 3.6%, ubiquitin-specific peptidase 54 (USP54)-calcium/calmodulin dependent protein kinase II γ (CAMK2G) in 2 of 55 or 3.6%, megakaryoblastic leukemia (translocation) 1 (MKL1)-fibulin 1 (FBLN1) in 1 of 55 or 1.8%, and CCR4-NOT transcription complex subunit 2 (CNOT2)-chromosome 12 open reading frame 49 (C12orf49) in 1 of 55 or 1.8%. A genomic analysis indicated that NPC1-MELK arose from a complex interchromosomal translocation event involving chromosomes 18, 3, and 9 with 3 rearrangement points, and this was consistent with chromoplexy. CONCLUSIONS: These data indicate that fusion transcripts occur at a stable frequency in EAC. Furthermore, our results indicate that chromoplexy is an underlying mechanism that generates fusion transcripts in EAC. These and other fusion transcripts merit further study as diagnostic markers and potential therapeutic targets in EAC. Cancer 2017;123:3916-24. © 2017 American Cancer Society.


Asunto(s)
Adenocarcinoma/genética , Neoplasias Esofágicas/genética , Reordenamiento Génico/genética , Proteínas Mutantes Quiméricas/genética , ARN Mensajero/metabolismo , Proteínas Adaptadoras Transductoras de Señales/genética , Adulto , Anciano , Anciano de 80 o más Años , Proteínas de Unión al Calcio/genética , Proteína Quinasa Tipo 2 Dependiente de Calcio Calmodulina/genética , Proteínas Portadoras/genética , Estudios de Casos y Controles , Línea Celular Tumoral , Femenino , Humanos , Péptidos y Proteínas de Señalización Intracelular , Masculino , Glicoproteínas de Membrana/genética , Persona de Mediana Edad , Proteína Niemann-Pick C1 , Proteínas Serina-Treonina Quinasas/genética , Receptor Tipo 2 de Factor de Crecimiento de Fibroblastos/genética , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa , Análisis de Secuencia de ARN , Transactivadores/genética , Proteasas Ubiquitina-Específicas/genética
13.
Cancer ; 123(9): 1507-1515, 2017 05 01.
Artículo en Inglés | MEDLINE | ID: mdl-28081303

RESUMEN

BACKGROUND: Novel fusion transcripts (FTs) caused by chromosomal rearrangement are common factors in the development of cancers. In the current study, the authors used massively parallel RNA sequencing to identify new FTs in colon cancers. METHODS: RNA sequencing (RNA-Seq) and TopHat-Fusion were used to identify new FTs in colon cancers. The authors then investigated whether the novel FT nuclear receptor subfamily 5, group A, member 2 (NR5A2)-Kelch-like family member 29 FT (KLHL29FT) was transcribed from a genomic chromosomal rearrangement. Next, the expression of NR5A2-KLHL29FT was measured by quantitative real-time polymerase chain reaction in colon cancers and matched corresponding normal epithelia. RESULTS: The authors identified the FT NR5A2-KLHL29FT in normal and cancerous epithelia. While investigating this transcript, it was unexpectedly found that it was due to an uncharacterized polymorphic germline insertion of the NR5A2 sequence from chromosome 1 into the KLHL29 locus at chromosome 2, rather than a chromosomal rearrangement. This germline insertion, which occurred at a population frequency of 0.40, appeared to bear no relationship to cancer development. Moreover, expression of NR5A2-KLHL29FT was validated in RNA specimens from samples with insertions of NR5A2 at the KLHL29 gene locus, but not from samples without this insertion. It is interesting to note that NR5A2-KLH29FT expression levels were significantly lower in colon cancers than in matched normal colonic epithelia (P =.029), suggesting the potential participation of NR5A2-KLHL29FT in the origin or progression of this tumor type. CONCLUSIONS: NR5A2-KLHL29FT was generated from a polymorphism insertion of the NR5A2 sequence into the KLHL29 locus. NR5A2-KLHL29FT may influence the origin or progression of colon cancer. Moreover, researchers should be aware that similar FTs may occur due to transchromosomal insertions that are not correctly annotated in genome databases, especially with current assembly algorithms. Cancer 2017;123:1507-1515. © 2017 American Cancer Society.


Asunto(s)
Proteínas Adaptadoras Transductoras de Señales/genética , Colon/metabolismo , Neoplasias del Colon/genética , Mutagénesis Insercional , Proteínas de Fusión Oncogénica/genética , ARN Mensajero/metabolismo , Receptores Citoplasmáticos y Nucleares/genética , Neoplasias del Colon/metabolismo , Mutación de Línea Germinal , Secuenciación de Nucleótidos de Alto Rendimiento , Humanos , Reacción en Cadena en Tiempo Real de la Polimerasa , Análisis de Secuencia de ARN
14.
Tumour Biol ; 37(8): 10923-34, 2016 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-26886285

RESUMEN

Esophageal squamous cell carcinoma (ESCC) has a poor prognosis due to high lymphatic metastatic recurrence rates after Ivor Lewis esophagectomy. We sought to investigate the correlation between tumor necrosis factor alpha-induced protein 8 (TNFAIP8) expression and postoperative lymphatic recurrence in patients with pN0 ESCC. One hundred twenty-two patients with pN0 ESCC undergoing Ivor Lewis esophagectomy were enrolled in this study. TNFAIP8 overexpression was found in 73 (59.8 %) tumor specimens. The 3-year lymphatic metastatic recurrence rate among TNFAIP8-overexpressing patients was significantly higher than in TNFAIP8-negative patients (p = 0.003). Multivariate Cox regression identified TNFAIP8 overexpression as an independent risk factor for lymphatic recurrence (p = 0.048). TNFAIP8 messenger RNA (mRNA) levels were significantly higher in patients with lymphatic recurrence than in patients without tumor recurrence (p = 0.019). Stable silencing of TNFAIP8 expression in ESCC-derived cells (Eca109) reduced proliferation, motility, and invasion and induced apoptosis. In addition, transient silencing of TNFAIP8 expression decreased cell motility and invasion and increased apoptosis in a second ESCC-derived cell line (KYSE150). Taken together, these findings suggest that TNFAIP8 overexpression is a potential biomarker to identify pN0 ESCC patients at higher risk of lymphatic recurrence who may benefit from adjuvant therapy.


Asunto(s)
Proteínas Reguladoras de la Apoptosis/biosíntesis , Biomarcadores de Tumor/análisis , Carcinoma de Células Escamosas/patología , Neoplasias Esofágicas/patología , Metástasis Linfática/patología , Recurrencia Local de Neoplasia/patología , Adulto , Anciano , Proteínas Reguladoras de la Apoptosis/análisis , Western Blotting , Carcinoma de Células Escamosas/metabolismo , Neoplasias Esofágicas/metabolismo , Carcinoma de Células Escamosas de Esófago , Esofagectomía , Femenino , Técnicas de Silenciamiento del Gen , Humanos , Inmunohistoquímica , Masculino , Persona de Mediana Edad , Recurrencia Local de Neoplasia/metabolismo , Reacción en Cadena de la Polimerasa , Modelos de Riesgos Proporcionales , Factores de Riesgo
15.
Gut ; 63(6): 881-90, 2014 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-24000294

RESUMEN

OBJECTIVES: Long non-coding RNAs (lncRNA) have been shown to play important roles in the development and progression of cancer. However, functional lncRNAs and their downstream mechanisms are largely unknown in the molecular pathogenesis of oesophageal adenocarcinoma (EAC) and its progression. DESIGN: lncRNAs that are abnormally upregulated in EACs were identified by RNA-sequencing analysis, followed by quantitative RT-PCR (qRTPCR) validation using tissues from 25 EAC patients. Cell biological assays in combination with small interfering RNA-mediated knockdown were performed in order to probe the functional relevance of these lncRNAs. RESULTS: We discovered that a lncRNA, HNF1A-AS1, is markedly upregulated in human primary EACs relative to their corresponding normal oesophageal tissues (mean fold change 10.6, p<0.01). We further discovered that HNF1A-AS1 knockdown significantly inhibited cell proliferation and anchorage-independent growth, suppressed S-phase entry, and inhibited cell migration and invasion in multiple in vitro EAC models (p<0.05). A gene ontological analysis revealed that HNF1A-AS1 knockdown preferentially affected genes that are linked to assembly of chromatin and the nucleosome, a mechanism essential to cell cycle progression. The well known cancer-related lncRNA, H19, was the gene most markedly inhibited by HNF1A-AS1 knockdown. Consistent to this finding, there was a significant positive correlation between HNF1A-AS1 and H19 expression in primary EACs (p<0.01). CONCLUSIONS: We have discovered abnormal upregulation of a lncRNA, HNF1A-AS1, in human EAC. Our findings suggest that dysregulation of HNF1A-AS1 participates in oesophageal tumorigenesis, and that this participation may be mediated, at least in part, by modulation of chromatin and nucleosome assembly as well as by H19 induction.


Asunto(s)
Adenocarcinoma/genética , Neoplasias Esofágicas/genética , Expresión Génica , ARN Largo no Codificante/genética , ARN Largo no Codificante/fisiología , Adenocarcinoma/patología , Línea Celular Tumoral , Movimiento Celular/genética , Proliferación Celular , Neoplasias Esofágicas/patología , Técnicas de Silenciamiento del Gen , Humanos , ARN Interferente Pequeño , Puntos de Control de la Fase S del Ciclo Celular/genética , Regulación hacia Arriba
16.
Gastroenterology ; 144(5): 956-966.e4, 2013 May.
Artículo en Inglés | MEDLINE | ID: mdl-23333711

RESUMEN

BACKGROUND & AIMS: Alterations in methylation of protein-coding genes are associated with Barrett's esophagus (BE) and esophageal adenocarcinoma (EAC). Dysregulation of noncoding RNAs occurs during carcinogenesis but has never been studied in BE or EAC. We applied high-resolution methylome analysis to identify changes at genomic regions that encode noncoding RNAs in BE and EAC. METHODS: We analyzed methylation of 1.8 million CpG sites using massively parallel sequencing-based HELP tagging in matched EAC, BE, and normal esophageal tissues. We also analyzed human EAC (OE33, SKGT4, and FLO-1) and normal (HEEpic) esophageal cells. RESULTS: BE and EAC exhibited genome-wide hypomethylation, significantly affecting intragenic and repetitive genomic elements as well as noncoding regions. These methylation changes targeted small and long noncoding regions, discriminating normal from matched BE or EAC tissues. One long noncoding RNA, AFAP1-AS1, was extremely hypomethylated and overexpressed in BE and EAC tissues and EAC cells. Its silencing by small interfering RNA inhibited proliferation and colony-forming ability, induced apoptosis, and reduced EAC cell migration and invasion without altering the expression of its protein-coding counterpart, AFAP1. CONCLUSIONS: BE and EAC exhibit reduced methylation that includes noncoding regions. Methylation of the long noncoding RNA AFAP1-AS1 is reduced in BE and EAC, and its expression inhibits cancer-related biologic functions of EAC cells.


Asunto(s)
Adenocarcinoma/genética , Esófago de Barrett/genética , ADN de Neoplasias/genética , Neoplasias Esofágicas/genética , Regulación Neoplásica de la Expresión Génica , Proteínas de Microfilamentos/genética , ARN Largo no Codificante/genética , Adenocarcinoma/metabolismo , Adenocarcinoma/patología , Esófago de Barrett/metabolismo , Esófago de Barrett/patología , Línea Celular Tumoral , Proliferación Celular , Transformación Celular Neoplásica/genética , Metilación de ADN , Neoplasias Esofágicas/metabolismo , Neoplasias Esofágicas/patología , Humanos , Proteínas de Microfilamentos/metabolismo , Regiones Promotoras Genéticas , ARN Interferente Pequeño/genética
17.
BMC Cancer ; 14: 345, 2014 May 20.
Artículo en Inglés | MEDLINE | ID: mdl-24885118

RESUMEN

BACKGROUND: Esophageal cancer ranks eighth among frequent cancers worldwide. Our aim was to investigate whether and at which neoplastic stage promoter hypermethylation of CAV1 is involved in human esophageal carcinogenesis. METHODS: Using real-time quantitative methylation-specific PCR (qMSP), we examined CAV1 promoter hypermethylation in 260 human esophageal tissue specimens. Real-time RT-PCR and qMSP were also performed on OE33 esophageal cancer cells before and after treatment with the demethylating agent, 5-aza-2'-deoxycytidine (5-Aza-dC). RESULTS: CAV1 hypermethylation showed highly discriminative ROC curve profiles, clearly distinguishing esophageal adenocarcinomas (EAC) and esophageal squamous cell carcinomas (ESCC) from normal esophagus (NE) (EAC vs. NE, AUROC = 0.839 and p < 0.0001; ESCC vs. NE, AUROC = 0.920 and p < 0.0001). Both CAV1 methylation frequency and normalized methylation value (NMV) were significantly higher in Barrett's metaplasia (BE), low-grade and high-grade dysplasia occurring in BE (D), EAC, and ESCC than in NE (all p < 0.01, respectively). Meanwhile, among 41 cases with matched NE and EAC or ESCC, CAV1 NMVs in EAC and ESCC (mean = 0.273) were significantly higher than in corresponding NE (mean = 0.146; p < 0.01, Student's paired t-test). Treatment of OE33 EAC cells with 5-Aza-dC reduced CAV1 methylation and increased CAV1 mRNA expression. CONCLUSIONS: CAV1 promoter hypermethylation is a frequent event in human esophageal carcinomas and is associated with early neoplastic progression in Barrett's esophagus.


Asunto(s)
Adenocarcinoma/metabolismo , Esófago de Barrett/metabolismo , Carcinoma de Células Escamosas/metabolismo , Caveolina 1/metabolismo , Metilación de ADN , Neoplasias Esofágicas/metabolismo , Adenocarcinoma/genética , Adenocarcinoma/patología , Área Bajo la Curva , Azacitidina/análogos & derivados , Azacitidina/farmacología , Esófago de Barrett/genética , Esófago de Barrett/patología , Carcinoma de Células Escamosas/genética , Carcinoma de Células Escamosas/patología , Caveolina 1/genética , Línea Celular Tumoral , Metilasas de Modificación del ADN/antagonistas & inhibidores , Metilasas de Modificación del ADN/metabolismo , Decitabina , Progresión de la Enfermedad , Inhibidores Enzimáticos/farmacología , Neoplasias Esofágicas/genética , Neoplasias Esofágicas/patología , Regulación Neoplásica de la Expresión Génica , Humanos , Regiones Promotoras Genéticas , ARN Mensajero/metabolismo , Curva ROC , Factores de Tiempo
18.
Am Psychol ; 79(2): 285-298, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-37982780

RESUMEN

Many of us interact with voice- or text-based conversational agents daily, but these conversational agents may unintentionally retrieve misinformation from human knowledge databases, confabulate responses on their own, or purposefully spread disinformation for political purposes. Does such misinformation or disinformation become part of our memory to further misguide our decisions? If so, can we prevent humans from suffering such social contagion of false memory? Using a social contagion of memory paradigm, here, we precisely controlled a social robot as an example of these emerging conversational agents. In a series of two experiments (ΣN = 120), the social robot occasionally misinformed participants prior to a recognition memory task. We found that the robot was as powerful as humans at influencing others. Despite the supplied misinformation being emotion- and value-neutral and hence not intrinsically contagious and memorable, 77% of the socially misinformed words became the participants' false memory. To mitigate such social contagion of false memory, the robot also forewarned the participants about its reservation toward the misinformation. However, one-time forewarnings failed to reduce false memory contagion. Even relatively frequent, item-specific forewarnings could not prevent warned items from becoming false memory, although such forewarnings helped increase the participants' overall cautiousness. Therefore, we recommend designing conversational agents to, at best, avoid providing uncertain information or, at least, provide frequent forewarnings about potentially false information. (PsycInfo Database Record (c) 2024 APA, all rights reserved).


Asunto(s)
Robótica , Humanos , Recuerdo Mental/fisiología , Interacción Social , Memoria/fisiología , Reconocimiento en Psicología/fisiología , Comunicación
19.
Aging (Albany NY) ; 16(5): 4348-4362, 2024 03 01.
Artículo en Inglés | MEDLINE | ID: mdl-38431308

RESUMEN

Diesel exhaust particles (DEPs) are major air pollutants emitted from automobile engines. Prenatal exposure to DEPs has been linked to neurodevelopmental and neurodegenerative diseases associated with aging. However, the specific mechanism by DEPs impair the hippocampal synaptic plasticity in the offspring remains unclear. Pregnant C57BL/6 mice were administered DEPs solution via the tail vein every other day for a total of 10 injections, then the male offsprings were studied to assess learning and memory by the Morris water maze. Additionally, protein expression in the hippocampus, including CPEB3, NMDAR (NR1, NR2A, NR2B), PKA, SYP, PSD95, and p-CREB was analyzed using Western blotting and immunohistochemistry. The alterations in the histomorphology of the hippocampus were observed in male offspring on postnatal day 7 following prenatal exposure to DEPs. Furthermore, 8-week-old male offspring exposed to DEPs during prenatal development exhibited impairments in the Morris water maze test, indicating deficits in learning and memory. Mechanistically, the findings from our study indicate that exposure to DEPs during pregnancy may alter the expression of CPEB3, SYP, PSD95, NMDAR (NR1, NR2A, and NR2B), PKA, and p-CREB in the hippocampus of both immature and mature male offspring. The results offer evidence for the role of the NMDAR/PKA/CREB and CPEB3 signaling pathway in mediating the learning and memory toxicity of DEPs in male offspring mice. The alterations in signaling pathways may contribute to the observed damage to synaptic structure and transmission function plasticity caused by DEPs. The findings hold potential for informing future safety assessments of DEPs.


Asunto(s)
Efectos Tardíos de la Exposición Prenatal , Emisiones de Vehículos , Femenino , Embarazo , Humanos , Ratones , Animales , Masculino , Emisiones de Vehículos/toxicidad , Aprendizaje por Laberinto , Efectos Tardíos de la Exposición Prenatal/metabolismo , Ratones Endogámicos C57BL , Receptores de N-Metil-D-Aspartato/metabolismo , Hipocampo/metabolismo , Plasticidad Neuronal , Proteínas de Unión al ARN/metabolismo
20.
ACS Nano ; 18(19): 12105-12116, 2024 May 14.
Artículo en Inglés | MEDLINE | ID: mdl-38669469

RESUMEN

Early detection of cancer is critical to improving clinical outcomes, especially in territories with limited healthcare resources. DNA methylation biomarkers have shown promise in early cancer detection, but typical workflows require highly trained personnel and specialized equipment for manual and lengthy processing, limiting use in resource-constrained areas. As a potential solution, we introduce the Automated Cartridge-based Cancer Early Screening System (ACCESS), a compact, portable, multiplexed, automated platform that performs droplet magnetofluidic- and methylation-specific qPCR-based assays for the detection of DNA methylation cancer biomarkers. Development of ACCESS focuses on esophageal cancer, which is among the most prevalent cancers in low- and middle-income countries with extremely low survival rates. Upon implementing detection assays for two esophageal cancer methylation biomarkers within ACCESS, we demonstrated successful detection of both biomarkers from esophageal tumor tissue samples from eight esophageal cancer patients while showing specificity in paired normal esophageal tissue samples. These results illustrate ACCESS's potential as an amenable epigenetic diagnostic tool for resource-constrained areas toward early detection of esophageal cancer and potentially other malignancies.


Asunto(s)
Biomarcadores de Tumor , Metilación de ADN , Neoplasias Esofágicas , Humanos , Biomarcadores de Tumor/análisis , Biomarcadores de Tumor/genética , Neoplasias Esofágicas/diagnóstico , Neoplasias Esofágicas/genética , Detección Precoz del Cáncer/instrumentación , Automatización , Técnicas Analíticas Microfluídicas/instrumentación
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA