Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 28
Filtrar
Mais filtros

Base de dados
País/Região como assunto
Tipo de documento
Intervalo de ano de publicação
1.
Nucleic Acids Res ; 52(10): 5698-5719, 2024 Jun 10.
Artigo em Inglês | MEDLINE | ID: mdl-38587186

RESUMO

AT-rich interaction domain protein 1A (ARID1A), a SWI/SNF chromatin remodeling complex subunit, is frequently mutated across various cancer entities. Loss of ARID1A leads to DNA repair defects. Here, we show that ARID1A plays epigenetic roles to promote both DNA double-strand breaks (DSBs) repair pathways, non-homologous end-joining (NHEJ) and homologous recombination (HR). ARID1A is accumulated at DSBs after DNA damage and regulates chromatin loops formation by recruiting RAD21 and CTCF to DSBs. Simultaneously, ARID1A facilitates transcription silencing at DSBs in transcriptionally active chromatin by recruiting HDAC1 and RSF1 to control the distribution of activating histone marks, chromatin accessibility, and eviction of RNAPII. ARID1A depletion resulted in enhanced accumulation of micronuclei, activation of cGAS-STING pathway, and an increased expression of immunomodulatory cytokines upon ionizing radiation. Furthermore, low ARID1A expression in cancer patients receiving radiotherapy was associated with higher infiltration of several immune cells. The high mutation rate of ARID1A in various cancer types highlights its clinical relevance as a promising biomarker that correlates with the level of immune regulatory cytokines and estimates the levels of tumor-infiltrating immune cells, which can predict the response to the combination of radio- and immunotherapy.


Assuntos
Cromatina , Reparo do DNA , Proteínas de Ligação a DNA , Imunidade , Fatores de Transcrição , Humanos , Linhagem Celular Tumoral , Cromatina/metabolismo , Montagem e Desmontagem da Cromatina/genética , Quebras de DNA de Cadeia Dupla , Reparo do DNA/genética , Proteínas de Ligação a DNA/deficiência , Proteínas de Ligação a DNA/genética , Proteínas de Ligação a DNA/metabolismo , Histona Desacetilase 1/genética , Histona Desacetilase 1/metabolismo , Recombinação Homóloga/genética , Imunidade/genética , Neoplasias/diagnóstico , Neoplasias/genética , Neoplasias/imunologia , Proteínas Nucleares/metabolismo , Proteínas Nucleares/genética , Nucleotidiltransferases/genética , Nucleotidiltransferases/metabolismo , Transativadores , Fatores de Transcrição/deficiência , Fatores de Transcrição/genética , Fatores de Transcrição/metabolismo
2.
Nat Methods ; 16(5): 401-404, 2019 05.
Artigo em Inglês | MEDLINE | ID: mdl-30988467

RESUMO

Profiling of both the genome and the transcriptome promises a comprehensive, functional readout of a tissue sample, yet analytical approaches are required to translate the increased data dimensionality, heterogeneity and complexity into patient benefits. We developed a statistical approach called Texomer ( https://github.com/KChen-lab/Texomer ) that performs allele-specific, tumor-deconvoluted transcriptome-exome integration of autologous bulk whole-exome and transcriptome sequencing data. Texomer results in substantially improved accuracy in sample categorization and functional variant prioritization.


Assuntos
Perfilação da Expressão Gênica/métodos , Genoma Humano , Genômica/métodos , Sequenciamento de Nucleotídeos em Larga Escala/métodos , Neoplasias/genética , Transcriptoma/genética , Alelos , DNA de Neoplasias/genética , Exoma/genética , Humanos , Mutação , Polimorfismo de Nucleotídeo Único
3.
Environ Sci Technol ; 52(10): 6009-6022, 2018 05 15.
Artigo em Inglês | MEDLINE | ID: mdl-29634279

RESUMO

Hyalella azteca is a cryptic species complex of epibenthic amphipods of interest to ecotoxicology and evolutionary biology. It is the primary crustacean used in North America for sediment toxicity testing and an emerging model for molecular ecotoxicology. To provide molecular resources for sediment quality assessments and evolutionary studies, we sequenced, assembled, and annotated the genome of the H. azteca U.S. Lab Strain. The genome quality and completeness is comparable with other ecotoxicological model species. Through targeted investigation and use of gene expression data sets of H. azteca exposed to pesticides, metals, and other emerging contaminants, we annotated and characterized the major gene families involved in sequestration, detoxification, oxidative stress, and toxicant response. Our results revealed gene loss related to light sensing, but a large expansion in chemoreceptors, likely underlying sensory shifts necessary in their low light habitats. Gene family expansions were also noted for cytochrome P450 genes, cuticle proteins, ion transporters, and include recent gene duplications in the metal sequestration protein, metallothionein. Mapping of differentially expressed transcripts to the genome significantly increased the ability to functionally annotate toxicant responsive genes. The H. azteca genome will greatly facilitate development of genomic tools for environmental assessments and promote an understanding of how evolution shapes toxicological pathways with implications for environmental and human health.


Assuntos
Anfípodes , Poluentes Químicos da Água , Animais , Ecotoxicologia , Sedimentos Geológicos , América do Norte , Testes de Toxicidade
4.
BMC Genomics ; 17: 220, 2016 Mar 11.
Artigo em Inglês | MEDLINE | ID: mdl-26969372

RESUMO

BACKGROUND: Recent advances in sequencing technology have opened a new era in RNA studies. Novel types of RNAs such as long non-coding RNAs (lncRNAs) have been discovered by transcriptomic sequencing and some lncRNAs have been found to play essential roles in biological processes. However, only limited information is available for lncRNAs in Drosophila melanogaster, an important model organism. Therefore, the characterization of lncRNAs and identification of new lncRNAs in D. melanogaster is an important area of research. Moreover, there is an increasing interest in the use of ChIP-seq data (H3K4me3, H3K36me3 and Pol II) to detect signatures of active transcription for reported lncRNAs. RESULTS: We have developed a computational approach to identify new lncRNAs from two tissue-specific RNA-seq datasets using the poly(A)-enriched and the ribo-zero method, respectively. In our results, we identified 462 novel lncRNA transcripts, which we combined with 4137 previously published lncRNA transcripts into a curated dataset. We then utilized 61 RNA-seq and 32 ChIP-seq datasets to improve the annotation of the curated lncRNAs with regards to transcriptional direction, exon regions, classification, expression in the brain, possession of a poly(A) tail, and presence of conventional chromatin signatures. Furthermore, we used 30 time-course RNA-seq datasets and 32 ChIP-seq datasets to investigate whether the lncRNAs reported by RNA-seq have active transcription signatures. The results showed that more than half of the reported lncRNAs did not have chromatin signatures related to active transcription. To clarify this issue, we conducted RT-qPCR experiments and found that ~95.24% of the selected lncRNAs were truly transcribed, regardless of whether they were associated with active chromatin signatures or not. CONCLUSIONS: In this study, we discovered a large number of novel lncRNAs, which suggests that many remain to be identified in D. melanogaster. For the lncRNAs that are known, we improved their characterization by integrating a large number of sequencing datasets (93 sets in total) from multiple sources (lncRNAs, RNA-seq and ChIP-seq). The RT-qPCR experiments demonstrated that RNA-seq is a reliable platform to discover lncRNAs. This set of curated lncRNAs with improved annotations can serve as an important resource for investigating the function of lncRNAs in D. melanogaster.


Assuntos
Drosophila melanogaster/genética , RNA Longo não Codificante/genética , Animais , Cromatina/genética , Imunoprecipitação da Cromatina , Anotação de Sequência Molecular , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Análise de Sequência de RNA
5.
Curr Environ Health Rep ; 11(3): 329-339, 2024 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-38886298

RESUMO

PURPOSE OF REVIEW: Numerous epidemiological studies have shown increased health risks among workers and residents living near nuclear power plants exposed to radiation levels meeting regulatory dose limits. This study aimed to evaluate the association between radiation exposure and disease risks among these populations exposed to radiation levels meeting the current regulatory dose limits. RECENT FINDINGS: We searched four databases (Cochrane Library, PubMed, ScienceDirect, and Web of Science) for studies published before August 2023, screened eligible studies (inclusion and exclusion criteria based on population, exposure, comparator, and outcome framework), and collected data on exposure indicators and disease risks. We applied random-effects models of meta-analysis to estimate the pooled effects and meta-regression to assess the dose-response relationship (radiation dose rate for workers and distance for residents). We identified 47 studies, 13 with worker and 34 with resident samples, covering 175 nuclear power plants from 17 countries, encompassing samples of 480,623 workers and 7,530,886 residents. Workers had a significantly lower risk for all-cancer and a significantly higher risk for mesothelioma. Residents had significantly higher risks for all-cancer, thyroid cancer, and leukemia. Notably, children under 5 years old showed the highest risk for all-cancer. Our meta-regression showed a significantly positive dose-response relationship between cumulative dose of radiation exposure and risk for circulatory disease among workers. Our findings demonstrated higher risks for mesothelioma for workers and all-cancer, thyroid cancer, and leukemia for residents exposed to low-dose radiation from nuclear power plants. Some included studies did not adjust for cancer risk confounders, which could overestimate the association between radiation exposure and cancer risk and increase the risk of bias.


Assuntos
Exposição Ambiental , Centrais Nucleares , Exposição Ocupacional , Exposição à Radiação , Humanos , Exposição Ocupacional/efeitos adversos , Exposição Ocupacional/análise , Exposição à Radiação/efeitos adversos , Exposição Ambiental/efeitos adversos , Neoplasias Induzidas por Radiação/epidemiologia , Neoplasias Induzidas por Radiação/etiologia
6.
Nat Commun ; 14(1): 6731, 2023 10 23.
Artigo em Inglês | MEDLINE | ID: mdl-37872136

RESUMO

Immunotherapies targeting cancer-specific neoantigens have revolutionized the treatment of cancer patients. Recent evidence suggests that epigenetic therapies synergize with immunotherapies, mediated by the de-repression of endogenous retroviral element (ERV)-encoded promoters, and the initiation of transcription. Here, we use deep RNA sequencing from cancer cell lines treated with DNA methyltransferase inhibitor (DNMTi) and/or Histone deacetylase inhibitor (HDACi), to assemble a de novo transcriptome and identify several thousand ERV-derived, treatment-induced novel polyadenylated transcripts (TINPATs). Using immunopeptidomics, we demonstrate the human leukocyte antigen (HLA) presentation of 45 spectra-validated treatment-induced neopeptides (t-neopeptides) arising from TINPATs. We illustrate the potential of the identified t-neopeptides to elicit a T-cell response to effectively target cancer cells. We further verify the presence of t-neopeptides in AML patient samples after in vivo treatment with the DNMT inhibitor Decitabine. Our findings highlight the potential of ERV-derived neoantigens in epigenetic and immune therapies.


Assuntos
Retrovirus Endógenos , Neoplasias , Humanos , Retrovirus Endógenos/genética , Inibidores de Histona Desacetilases/farmacologia , Linfócitos T , Antígenos de Histocompatibilidade Classe I
7.
Materials (Basel) ; 15(10)2022 May 19.
Artigo em Inglês | MEDLINE | ID: mdl-35629667

RESUMO

To lower the charge leakage of a floating gate device and improve the operation performance of memory devices toward a smaller structure size and a higher component capability, two new types of floating gates composed of pn-type polysilicon or np-type polysilicon were developed in this study. Their microstructure and elemental compositions were investigated, and the sheet resistance, threshold voltages and erasing voltages were measured. The experimental results and charge simulation indicated that, by forming an n-p junction in the floating gate, the sheet resistance was increased, and the charge leakage was reduced because of the formation of a carrier depletion zone at the junction interface serving as an intrinsic potential barrier. Additionally, the threshold voltage and erasing voltage of the np-type floating gate were elevated, suggesting that the performance of the floating gate in the operation of memory devices can be effectively improved without the application of new materials or changes to the physical structure.

8.
Membranes (Basel) ; 11(10)2021 Sep 30.
Artigo em Inglês | MEDLINE | ID: mdl-34677524

RESUMO

By a sol-gel method, a BiFeO3 (BFO) capacitor is fabricated and connected with the control thin film transistor (TFT). Compared with a control thin-film transistor, the proposed BFO TFT achieves 56% drive current enhancement and 7-28% subthreshold swing (SS) reduction. Moreover, the effect of the proposed BiFeO3 capacitor on IDS-VGS hysteresis in the BFO TFT is 0.1-0.2 V. Because dVint/dVGS > 1 is obtained at a wide range of VGS, it reveals that the incomplete dipole flipping is a major mechanism to obtain improved SS and a small hysteresis effect in the BFO TFT. Experimental results indicate that sol-gel BFO TFT is a potential candidate for digital application.

9.
Cancers (Basel) ; 13(10)2021 May 18.
Artigo em Inglês | MEDLINE | ID: mdl-34070078

RESUMO

Radiotherapy, a common component in cancer treatment, can induce adverse effects including fibrosis in co-irradiated tissues. We previously showed that differential DNA methylation at an enhancer of diacylglycerol kinase alpha (DGKA) in normal dermal fibroblasts is associated with radiation-induced fibrosis. After irradiation, the transcription factor EGR1 is induced and binds to the hypomethylated enhancer, leading to increased DGKA and pro-fibrotic marker expression. We now modulated this DGKA induction by targeted epigenomic and genomic editing of the DGKA enhancer and administering epigenetic drugs. Targeted DNA demethylation of the DGKA enhancer in HEK293T cells resulted in enrichment of enhancer-related histone activation marks and radiation-induced DGKA expression. Mutations of the EGR1-binding motifs decreased radiation-induced DGKA expression in BJ fibroblasts and caused dysregulation of multiple fibrosis-related pathways. EZH2 inhibitors (GSK126, EPZ6438) did not change radiation-induced DGKA increase. Bromodomain inhibitors (CBP30, JQ1) suppressed radiation-induced DGKA and pro-fibrotic marker expression. Similar drug effects were observed in donor-derived fibroblasts with low DNA methylation. Overall, epigenomic manipulation of DGKA expression may offer novel options for a personalized treatment to prevent or attenuate radiotherapy-induced fibrosis.

10.
Eur J Oral Sci ; 118(2): 151-8, 2010 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-20487004

RESUMO

Osteoarthritis (OA) sometimes occurs as a consequence of repeated microtrauma involved in parafunction, which may lead to microfracture in the subchondral bone. The aim of this in vitro study was to evaluate the effects of subchondral osteoblasts in loading with repeated excessive mechanical stress on the metabolism of overlying chondrocytes. A high-magnitude cyclic tensile stress of 15 kPa (30 cycles min(-1)) was applied to the cultured osteoblasts obtained from porcine mandibular condyles. The chondrocytes in alginate beads were then co-cultured with mechanically stressed or unstressed osteoblasts. Chondrocytes co-cultured with unstressed osteoblasts showed a phenotypic shift to hypertrophic chondrocytes, characterized by decreased expression of type II collagen, aggrecan, Sry-related HMG box (SOX-9), and cartilage oligomeric matrix protein (COMP) genes and increased expression of type X collagen and bone sialoprotein (BSP) genes, suggesting that the co-culture may change the chondrocyte differentiation to some extent. These changes were more distinct in chondrocytes co-cultured with excessively mechanically stressed osteoblasts. After co-culture with stressed osteoblasts, the expressions of matrix metalloproteinase (MMP)1, MMP3 and MMP13 genes were also enhanced and the synthesis of DNA, proteoglycan and collagen were significantly decreased in chondrocytes. These results demonstrate that alterations in cartilage metabolism can be induced by stressed osteoblasts, indicating a possible explanation for the onset and progression of OA.


Assuntos
Condrócitos/metabolismo , Osteoblastos/fisiologia , Agrecanas/análise , Fosfatase Alcalina/análise , Animais , Fenômenos Biomecânicos , Cartilagem Articular/citologia , Diferenciação Celular/fisiologia , Células Cultivadas , Técnicas de Cocultura , Colágeno/análise , Colágeno Tipo II/análise , Colágeno Tipo X/análise , DNA/análise , Proteínas da Matriz Extracelular/análise , Glicoproteínas/análise , Hipertrofia , Sialoproteína de Ligação à Integrina , Côndilo Mandibular/citologia , Proteínas Matrilinas , Metaloproteinase 1 da Matriz/análise , Metaloproteinase 13 da Matriz/análise , Metaloproteinase 3 da Matriz/análise , Fenótipo , Proteoglicanas/análise , Fatores de Transcrição SOX9/análise , Sialoglicoproteínas/análise , Estresse Mecânico , Suínos , Fator de Crescimento Transformador beta/análise
11.
Mol Biol Cell ; 18(5): 1710-22, 2007 May.
Artigo em Inglês | MEDLINE | ID: mdl-17332505

RESUMO

Podocalyxin/Gp135 was recently demonstrated to participate in the formation of a preapical complex to set up initial polarity in MDCK cells, a function presumably depending on the apical targeting of Gp135. We show that correct apical sorting of Gp135 depends on a bipartite signal composed of an extracellular O-glycosylation-rich region and the intracellular PDZ domain-binding motif. The function of this PDZ-binding motif could be substituted with a fusion construct of Gp135 with Ezrin-binding phosphoprotein 50 (EBP50). In accordance with this observation, EBP50 binds to newly synthesized Gp135 at the Golgi apparatus and facilitates oligomerization and sorting of Gp135 into a clustering complex. A defective connection between Gp135 and EBP50 or EBP50 knockdown results in a delayed exit from the detergent-resistant microdomain, failure of oligomerization, and basolateral missorting of Gp135. Furthermore, the basolaterally missorted EBP50-binding defective mutant of Gp135 was rapidly retrieved via a PKC-dependent mechanism. According to these findings, we propose a model by which a highly negative charged transmembrane protein could be packed into an apical sorting platform with the aid of its cytoplasmic partner EBP50.


Assuntos
Sialoglicoproteínas/metabolismo , Motivos de Aminoácidos , Animais , Sequência de Bases , Sítios de Ligação , Proteínas de Transporte/antagonistas & inibidores , Proteínas de Transporte/genética , Polaridade Celular , Células Cultivadas , Proteínas do Citoesqueleto/metabolismo , Cães , Endocitose , Glicosilação , Microdomínios da Membrana/metabolismo , Modelos Biológicos , Mutação , Proteína Quinase C/metabolismo , Sinais Direcionadores de Proteínas/genética , Estrutura Terciária de Proteína , RNA Interferente Pequeno/genética , Sialoglicoproteínas/química , Sialoglicoproteínas/genética , Transdução de Sinais
12.
Arch Oral Biol ; 53(4): 330-6, 2008 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-18160062

RESUMO

Hyaluronan (HA) exists in various living tissues as one of the major matrix macromolecules, and is well known to play an integral role in cell differentiation and proliferation. The present study was conducted to elucidate whether or not the proliferation of periodontal ligament (PDL) cells are affected specifically by the degradation of HA by hyaluronidasze (HAase). Human PDL fibroblasts were isolated and cultured with and without 15-150U/ml bovine testicular HAase from 1 to 11 days after seeding. The cells were also cultured with anti-CD44 antibody of 2 microg/ml. For the control against the anti-CD44 antibody treatment, 2 microg/ml IgG was used. The HA-dependent pericellular matrix was visualized by particle-exclusion assay. The number of cells was counted by MTT assay during the proliferation. The mRNA levels of HA synthases (HASs), HAases (HYALs) and CD44s were examined by a quantitative real-time PCR analysis. The cell proliferation was inhibited by the treatment with HAase and anti-CD44 antibody in cultured PDL fibroblasts. HASs mRNAs were down-regulated, whereas HYALs mRNAs were up-regulated significantly by the treatment with HAase and anti-CD44 antibody. The CD44s mRNA level exhibited no significant changes. These results suggest that HA may contribute to modulate the proliferation of cultured human PDL cells through a CD44-mediated mechanism.


Assuntos
Hialuronoglucosaminidase/farmacologia , Ligamento Periodontal/efeitos dos fármacos , Anticorpos Monoclonais/metabolismo , Ligação Competitiva , Proliferação de Células/efeitos dos fármacos , Células Cultivadas , Relação Dose-Resposta a Droga , Fibroblastos/citologia , Fibroblastos/efeitos dos fármacos , Fibroblastos/metabolismo , Regulação da Expressão Gênica/efeitos dos fármacos , Glucuronosiltransferase/biossíntese , Glucuronosiltransferase/genética , Humanos , Receptores de Hialuronatos/biossíntese , Receptores de Hialuronatos/genética , Receptores de Hialuronatos/imunologia , Hialuronan Sintases , Hialuronoglucosaminidase/biossíntese , Hialuronoglucosaminidase/genética , Ligamento Periodontal/citologia , Ligamento Periodontal/metabolismo , Reação em Cadeia da Polimerase/métodos , RNA Mensageiro/genética
13.
Methods Mol Biol ; 1757: 557-577, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29761470

RESUMO

The i5k Workspace@NAL is a genome database tailored toward newly sequenced arthropod genomes and their research communities. With 56 arthropod genomes and counting, the i5k Workspace strives to facilitate public data access, visualization, and community curation across arthropod species. Any researcher with an arthropod genome project who would like to take advantage of the i5k Workspace facilities is encouraged to submit their data. In this chapter, we explain how to use the i5k Workspace@NAL to submit, find, and improve arthropod genomics data.


Assuntos
Artrópodes/genética , Bases de Dados Genéticas , Genoma , Genômica , Animais , Biologia Computacional/métodos , Genômica/métodos , Anotação de Sequência Molecular , Software , Interface Usuário-Computador , Navegador
14.
PeerJ ; 6: e5852, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30397550

RESUMO

BACKGROUND: The need for read-based phasing arises with advances in sequencing technologies. The minimum error correction (MEC) approach is the primary trend to resolve haplotypes by reducing conflicts in a single nucleotide polymorphism-fragment matrix. However, it is frequently observed that the solution with the optimal MEC might not be the real haplotypes, due to the fact that MEC methods consider all positions together and sometimes the conflicts in noisy regions might mislead the selection of corrections. To tackle this problem, we present a hierarchical assembly-based method designed to progressively resolve local conflicts. RESULTS: This study presents HAHap, a new phasing algorithm based on hierarchical assembly. HAHap leverages high-confident variant pairs to build haplotypes progressively. The phasing results by HAHap on both real and simulated data, compared to other MEC-based methods, revealed better phasing error rates for constructing haplotypes using short reads from whole-genome sequencing. We compared the number of error corrections (ECs) on real data with other methods, and it reveals the ability of HAHap to predict haplotypes with a lower number of ECs. We also used simulated data to investigate the behavior of HAHap under different sequencing conditions, highlighting the applicability of HAHap in certain situations.

18.
Oncotarget ; 7(37): 59845-59859, 2016 Sep 13.
Artigo em Inglês | MEDLINE | ID: mdl-27542222

RESUMO

Recent reports demonstrate that the expression of protein kinase C alpha (PKCα) in triple-negative breast cancer (TNBC) correlates with decreased survival outcomes. However, off-target effects of targeting PKCα and limited understanding of the signaling mechanisms upstream of PKCα have hampered previous efforts to manipulate this ubiquitous gene. This study shows that the expression of both myeloid zinc finger 1 (MZF-1) and Ets-like protein-1 (Elk-1) correlates with PKCα expression in TNBC. We found that the acidic domain of MZF-1 and the heparin-binding domain of Elk-1 facilitate the heterodimeric interaction between the two genes before the complex formation binds to the PKCα promoter. Blocking the formation of the heterodimer by transfection of MZF-160-72 or Elk-1145-157 peptide fragments at the MZF-1 / Elk-1 interface decreases DNA-binding activity of the MZF-1 / Elk-1 complex at the PKCα promoter. Subsequently, PKCα expression, migration, tumorigenicity, and the epithelial-mesenchymal transition potential of TNBC cells decrease. These subsequent effects are reversed by transfection with full-length PKCα, confirming that the MZF-1/Elk-1 heterodimer is a mediator of PKCα in TNBC cells. These data suggest that the next therapeutic strategy in treating PKCα-related cancer will be developed from blocking MZF-1/Elk-1 interaction through their binding domain.


Assuntos
Fatores de Transcrição Kruppel-Like/metabolismo , Fragmentos de Peptídeos/metabolismo , Proteína Quinase C-alfa/metabolismo , Neoplasias de Mama Triplo Negativas/metabolismo , Proteínas Elk-1 do Domínio ets/metabolismo , Carcinogênese , Linhagem Celular Tumoral , Movimento Celular , Transição Epitelial-Mesenquimal , Feminino , Humanos , Fatores de Transcrição Kruppel-Like/genética , Fragmentos de Peptídeos/genética , Regiões Promotoras Genéticas/genética , Ligação Proteica , Domínios Proteicos/genética , Proteína Quinase C-alfa/genética , Transdução de Sinais , Neoplasias de Mama Triplo Negativas/tratamento farmacológico , Proteínas Elk-1 do Domínio ets/genética
19.
J Econ Entomol ; 109(3): 1378-1386, 2016 Apr 22.
Artigo em Inglês | MEDLINE | ID: mdl-27106222

RESUMO

Pesticide resistance poses many challenges for pest control, particularly for destructive pests such as diamondback moths ( Plutella xylostella ). Organophosphates have been used in the field since the 1950s, leading to selection for resistance-related gene variants and the development of resistance to new insecticides in the diamondback moth. Identifying actual and potential genes involved in resistance could offer solutions for control. This study established resistant diamondback moth strains from two different collections using mevinphos. Two sets of transcriptome sequencing (RNA-Seq) data were generated for pairs of mevinphos-resistant versus susceptible (wild-type) strains. One susceptible strain containing 14 giga base pairs was assembled into a reference-based assembly using published scaffold sequences as reference. Differential expression data between resistant and susceptible strains revealed 944 transcripts (803 with annotations) showing upregulation and 427 transcripts (150 with annotations) showing downregulation. Around 6.8% of the differential expression transcripts (65) could be categorized as associated with well-known resistance mechanisms such as penetration, detoxification, and behavior response; of these 65 transcripts, 38 showed upregulation, and 12 relating to penetration were upregulated when the transcripts of 19 cytochrome P450s, 2 zeta-class glutathione S-transferases, and 4 ATP-binding cassette transporters showed upregulation. In addition, 11 groups of transcripts related to olfactory perception appeared to be downregulated in trade-off situations. Quantitative polymerase chain reaction expression results were consistent with RNA-Seq data. Possible roles of these differentially expressed genes in resistance mechanisms are discussed in this study.

20.
Mol Med Rep ; 14(2): 1636-42, 2016 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-27357025

RESUMO

AXL receptor tyrosine kinase is overexpressed in triple-negative breast cancer (TNBC), and has a function in cancer progression and metastases. However, the mechanism underlying AXL gene regulation in TNBC remains unknown. In this study, the involvement of protein kinase C α (PKCα) in the expression of AXL was investigated in human TNBC cells. The microarray data from other studies showed that PKCα is significantly correlated with AXL expression in TNBC cell lines. Tissue array analysis also confirmed their correlation in TNBC. The PKCα inhibitor Go6976 was used to treat MDA­MB­231 and Hs578T TNBC cells, which resulted in decreased expression of AXL and epithelia-mesenchymal transition-related gene vimentin, and decreased cell proliferation. An MZF­1 acidic domain fragment (MZF-1 peptide), which was designed to downregulate PKCα expression, was transfected into the cells and resulted in inhibition of AXL expression. This effect was reversed by co­treatment with the constitutive form of PKCα. Moreover, the downregulation of PKCα was also confirmed by treatment with TAT­fused MZF­1 peptide. Thus, the current study proposes that AXL may be correlated with PKCα­dependent TNBC cells, and could be modulated by MZF­1 peptides.


Assuntos
Regulação Neoplásica da Expressão Gênica , Proteína Quinase C-alfa/metabolismo , Proteínas Proto-Oncogênicas/genética , Receptores Proteína Tirosina Quinases/genética , Neoplasias de Mama Triplo Negativas/genética , Neoplasias de Mama Triplo Negativas/metabolismo , Adulto , Idoso , Linhagem Celular Tumoral , Feminino , Perfilação da Expressão Gênica , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Humanos , Fatores de Transcrição Kruppel-Like/química , Fatores de Transcrição Kruppel-Like/metabolismo , Pessoa de Meia-Idade , Gradação de Tumores , Estadiamento de Neoplasias , Fragmentos de Peptídeos/farmacologia , Proteína Quinase C-alfa/genética , Proteoma , Proteômica/métodos , Proteínas Proto-Oncogênicas/metabolismo , Receptores Proteína Tirosina Quinases/metabolismo , Neoplasias de Mama Triplo Negativas/patologia , Receptor Tirosina Quinase Axl
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA