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1.
Inorg Chem ; 62(49): 20194-20201, 2023 Dec 11.
Artigo em Inglês | MEDLINE | ID: mdl-37988673

RESUMO

Layered double hydroxides (LDHs) are some of the most promising precursors for the development of economically stable and efficient electrocatalysts for water splitting. An effective strategy for designing excellent performance electrocatalysts is to assemble core-shell heterostructures with a tunable electronic structure. In this work, three core-shell heterostructure electrocatalysts (NiCo@NiFe-LDH100/150/200) are developed by a simple hydrothermal and subsequent electrodeposition method on Ni foam. Among them, NiCo@NiFe-LDH150/NF exhibits the best oxygen evolution reaction electrocatalytic activity and long-term stability with a low overpotential of 197 mV to deliver a current density of 10 mA cm-2. In addition, an efficient and stable alkaline electrolytic cell with NiCo@NiFe-LDH150/NF both as the cathode and anode achieves a voltage of 1.66 V at a current density of 10 mA cm-2 and realization of ultralong stability at current densities of 20 and 200 mA cm-2 for 200 h. Density functional theory calculations reveal the strong electron interaction at the heterogeneous interface of the NiCo@NiFe-LDH150/NF core-shell structure, which effectively improves the intrinsic electron conductivity and ion diffusion kinetics and makes an important contribution to the electrocatalytic performance of the material. This work provides a new idea for the selection of materials for electrochemical water splitting by the construction of heterojunction interfaces.

2.
Inorg Chem ; 61(47): 19031-19038, 2022 Nov 28.
Artigo em Inglês | MEDLINE | ID: mdl-36374565

RESUMO

Highly active and stable oxygen evolution reaction (OER) electrocatalysts for water electrolysis are currently in high demand. Herein, a rationally designed three-dimensional (3D) CoFe selenide porous array (Fe-CoSe PA) is synthesized through ion exchange from zeolitic imidazolate framework-L (ZIF-L) nanoarray, followed by a facile selenization under hydrothermal conditions for OER electrocatalysis. During the OER process, the surface of Fe-CoSe PA is rapidly oxidized to CoFe oxides/hydroxides, which prevents the inner layer from being oxidized. Benefiting from the high porosity, abundant active sites, and the high conductivity of inner Fe-CoSe, Fe-CoSe PA exhibits excellent OER performance, with an overpotential of 285 mV at a current density of 10 mA cm-2, and a small Tafel slope of 68 mV dec-1, as well as high stability under 50 h of continuous testing. The present work could provide a facile route for fabricating 3D porous selenides for highly efficient OER catalysis.

3.
Risk Anal ; 41(11): 2046-2064, 2021 11.
Artigo em Inglês | MEDLINE | ID: mdl-33864640

RESUMO

Epidemic diseases (EDs) present a significant but challenging risk endangering public health, evidenced by the outbreak of COVID-19. Compared to other risks affecting public health such as flooding, EDs attract little attention in terms of risk assessment in the current literature. It does not well respond to the high practical demand for advanced techniques capable of tackling ED risks. To bridge this gap, an adapted fuzzy evidence reasoning method is proposed to realize the quantitative analysis of ED outbreak risk assessment (EDRA) with high uncertainty in risk data. The novelty of this article lies in (1) taking the lead to establish the outbreak risk evaluation system of epidemics covering the whole epidemic developing process, (2) combining quantitative and qualitative analysis in the fields of epidemic risk evaluation, (3) collecting substantial first-hand data by reviewing transaction data and interviewing the frontier experts and policymakers from Chinese Centers for Disease Control and Chinese National Medical Products Administration. This work provides useful insights for the regulatory bodies to (1) understand the risk levels of different EDs in a quantitative manner and (2) the sensitivity of different EDs to the identified risk factors for their effective control. For instance, in the case study, we use real data to disclose that influenza has the highest breakout risk level in Beijing. The proposed method also provides a potential tool for evaluating the outbreak risk of COVID-19.


Assuntos
COVID-19/epidemiologia , Surtos de Doenças , Lógica Fuzzy , Administração em Saúde Pública , Saúde Pública/métodos , Medição de Risco/métodos , Adulto , China , Epidemias , Humanos , Masculino , Pessoa de Meia-Idade , Análise de Componente Principal , Fatores de Risco , SARS-CoV-2 , Sensibilidade e Especificidade , Software
4.
Biochem Biophys Res Commun ; 527(1): 76-82, 2020 06 18.
Artigo em Inglês | MEDLINE | ID: mdl-32446394

RESUMO

Hepatitis B virus (HBV) is a major risk factor for liver diseases, in which HBV covalently closed circular DNA (cccDNA), as the genomic form that templates viral transcription, plays crucial roles in sustaining viral persistence. Clinically, the excessive ethanol intake accelerates the progression of liver diseases with HBV infection. Here, we supposed that ethanol might trigger HBV cccDNA in the liver. Interestingly, we observed that the ethanol remarkably elevated the levels of HBeAg, HBsAg, HBV DNA and cccDNA in HBV-expressing hepatoma cells. Mechanically, the ethanol increased the levels of HBx and MSL2 in vivo and in HBV-expressing HepG2 cells, but not in HBV-free HepG2 cells. Moreover, the down-regulation of MSL2 by small interference RNA could block the ethanol-promoted HBV cccDNA in HepG2.2.15 cells. As a commonly administered treatment for HBV, the effect of IFNα on ethanol-triggered HBV cccDNA remains poorly understood. Strikingly, we showed that the treatment with IFN-α2b inhibited the ethanol-promoted cccDNA through depressing MSL2 in the cells. Thus, we conclude that IFN-α2b inhibits the ethanol-enriched HBV cccDNA through blocking a positive feedback loop of HBx/MSL2/cccDNA/HBV/HBx. Our finding provides new insights into the mechanism by which IFN-α2b inhibits ethanol-enhanced HBV cccDNA. Therapeutically, IFNα may contribute to the cccDNA induced by ethanol in liver.


Assuntos
DNA Circular/genética , Etanol/farmacologia , Vírus da Hepatite B/genética , Hepatite B/complicações , Interferon-alfa/farmacologia , Fígado/efeitos dos fármacos , Adjuvantes Imunológicos/farmacologia , Consumo de Bebidas Alcoólicas/epidemiologia , DNA Viral/genética , Células Hep G2 , Hepatite B/tratamento farmacológico , Hepatite B/genética , Hepatite B/virologia , Antígenos de Superfície da Hepatite B/análise , Antígenos de Superfície da Hepatite B/genética , Antígenos E da Hepatite B/análise , Antígenos E da Hepatite B/genética , Vírus da Hepatite B/fisiologia , Humanos , Interferon alfa-2 , Fígado/metabolismo , Fígado/virologia , Ubiquitina-Proteína Ligases/análise , Ubiquitina-Proteína Ligases/genética , Replicação Viral/efeitos dos fármacos
5.
Med Sci Monit ; 26: e927869, 2020 Dec 28.
Artigo em Inglês | MEDLINE | ID: mdl-33361741

RESUMO

BACKGROUND Centrosome amplification is recognized as a hallmark of cancer. Kinesin family member C1 (KIFC1), a centrosome-clustering molecule, is essential for the viability of extra centrosome-bearing cancer cells and may be the basis for the progression of ovarian cancer. However, its biological function and mechanism in ovarian cancer have not yet been studied. MATERIAL AND METHODS Quantitative reverse-transcription polymerase chain reaction was performed to detect the levels of KIFC1 and centrosome protein E (CENPE). Further, cell viability was analyzed with CCK-8 assay, and immunofluorescence was used to measure the expression of Ki67 and PCNA. Cell migration was analyzed with wound healing and transwell assays. Western blot analysis was performed to measure the expression of proteins in ovarian cancer cells. The relationship between KIFC1 and CENPE was investigated by performing co-immunoprecipitation. RESULTS KIFC1 was upregulated in ovarian cancer cells, especially in SKOV3 cells. Additionally, we found that KIFC1 silencing in SKOV3 cells inhibited cell proliferation and downregulated the expression of Ki67 and PCNA. Further, the knockdown of KIFC1 suppressed cell migration and epithelial-mesenchymal transition (EMT) and regulated the expression of matrix metalloproteinase (MMP)2, MMP9, E-cadherin, N-cadherin, Snail, and ZEB1. Next, we found that KIFC1 bound to and positively regulated CENPE, a tumor promoter in certain human cancers. All the suppressive effects triggered by KIFC1 inhibition were reversed by CENPE overexpression. CONCLUSIONS KIFC1 contributed to cell proliferation, migration, and EMT via interacting with CENPE in ovarian cancer. KIFC1 might be a potential biomarker and therapeutic target in ovarian cancer patients.


Assuntos
Movimento Celular , Proteínas Cromossômicas não Histona/metabolismo , Transição Epitelial-Mesenquimal , Regulação Neoplásica da Expressão Gênica , Cinesinas/metabolismo , Neoplasias Ovarianas/genética , Neoplasias Ovarianas/patologia , Linhagem Celular Tumoral , Movimento Celular/genética , Proliferação de Células/genética , Proteínas Cromossômicas não Histona/genética , Regulação para Baixo/genética , Transição Epitelial-Mesenquimal/genética , Feminino , Técnicas de Silenciamento de Genes , Humanos , Cinesinas/genética
6.
Mol Cell Biochem ; 459(1-2): 113-120, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31114933

RESUMO

Encorafenib, a new-generation BRAF inhibitor, has been approved by FDA for the treatment of melanoma in combination with binimetinib. However, the mechanism of the drug works in colorectal cancer (CRC) is still unclear. In this study, the suppression of growth of CRC cells by encorafenib was investigated. The effects of treatment of encorafenib on pathways linked to cancer were studied, and the effective inhibition of cell proliferation was documented. Our findings showed that cell migration was inhibited by encorafenib through a likely involvement of MPP and TIMP modulation. Furthermore, encorafenib treatment also induced cell cycle arrest. In addition, induction of apoptosis in CRC cells by elevating levels of PUMA. These observations indicate the potential therapeutic efficacy of encorafenib on CRC.


Assuntos
Apoptose/efeitos dos fármacos , Carbamatos/farmacologia , Pontos de Checagem do Ciclo Celular/efeitos dos fármacos , Movimento Celular/efeitos dos fármacos , Neoplasias Colorretais/tratamento farmacológico , Sulfonamidas/farmacologia , Linhagem Celular Tumoral , Neoplasias Colorretais/metabolismo , Neoplasias Colorretais/patologia , Humanos
7.
J Craniofac Surg ; 28(6): 1628-1634, 2017 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-28796107

RESUMO

The aim of this study is to explore the effects of abnormal occlusion and functional recovery caused by functional mandible deviation on the head and neck muscles and muscle spindle sensory-motor system by electrophysiological response and endogenous monoamine neurotransmitters' distribution in the nucleus of the spinal tract. Seven-week-old male Wistar rats were randomly divided into 7 groups: normal control group, 2W experimental control group, 2W functional mandible deviation group, 2W functional mandible deviation recovery group, 4W experimental control group, 4W functional mandible deviation group, 4W functional mandible deviation recovery group. Chewing muscles, digastric muscle, splenius, and trapezius muscle spindles electrophysiological response activities at the opening and closing state were recorded. And then the chewing muscles, digastric, splenius, trapezius, and neck trigeminal nucleus were taken for histidine decarboxylase (HDC) detection by high performance liquid chromatography (HPLC), immunofluorescence, and reverse-transcription polymerase chain reaction (RT-PCR). Histamine receptor proteins in the neck nucleus of the spinal tract were also examined by immunofluorescence and RT-PCR. Electromyography activity of chewing muscles, digastric, and splenius muscle was significantly asymmetric; the abnormal muscle electromyography activity was mainly detected at the ipsilateral side. After functional mandibular deviation, muscle sensitivity on the ipsilateral sides of the chewing muscle and splenius decreased, muscle excitement weakened, modulation depth decreased, and the muscle spindle afferent impulses of excitation transmission speed slowed down. Changes for digastric muscle electrical activity were contrary. The functions recovered at different extents after removing the deflector. However, trapezius in all the experimental groups and recovery groups exhibited bilateral symmetry electrophysiological responses, and no significant difference compared with the control group. After functional mandibular deviation, HDC protein and messenger ribonucleic acid (mRNA) levels on the ipsilateral sides of the chewing muscle and splenius increased significantly. HDC level changes for digastric muscle were contrary. After the removal of the mandibular position deflector, HDC protein and mRNA levels decreased on the ipsilateral sides of the chewing muscle and splenius while they increased in the digastric muscle. The difference of histamine decarboxylase content in the bilateral trapezius in each experimental group was small. After functional mandibular deviation, the temporomandibular joint mechanical receptors not only caused the fusimotor fiber hypoallergenic fatigue slow response on the ipsilateral sides of splenius, but also increased the injury neurotransmitter histamine release. The authors' results further support the opinion that the temporomandibular joint receptors may be involved in the mechanical theory of the head and neck muscles nervous system regulation.


Assuntos
Histamina , Doenças Maxilomandibulares , Mandíbula , Fusos Musculares , Músculos do Pescoço , Animais , Histamina/análise , Histamina/metabolismo , Doenças Maxilomandibulares/metabolismo , Doenças Maxilomandibulares/fisiopatologia , Má Oclusão/metabolismo , Má Oclusão/fisiopatologia , Mandíbula/metabolismo , Mandíbula/fisiopatologia , Fusos Musculares/metabolismo , Fusos Musculares/fisiopatologia , Músculos do Pescoço/metabolismo , Músculos do Pescoço/fisiopatologia , Ratos , Ratos Wistar
8.
Appl Opt ; 55(5): 1095-100, 2016 Feb 10.
Artigo em Inglês | MEDLINE | ID: mdl-26906382

RESUMO

We have demonstrated an imaging-based amplitude laser-beam-shaping technique for material processing by 2D reflectivity tuning of a spatial light modulator. Intensity masks with 256 gray levels were designed to shape the input laser beam in the outline profile and inside intensity distribution. Squared and circular flattop beam shapes were obtained at the diffractive near-field and then reconstructed at an image plane of an f-theta lens (f∼100 mm). The observed intensity distribution inside the beam-shaping geometry was much more even than using binary masks. The ablation footprint well matches the desired beam shape.

9.
Nanomaterials (Basel) ; 13(19)2023 Sep 22.
Artigo em Inglês | MEDLINE | ID: mdl-37836262

RESUMO

Water electrolysis is a compelling method for the production of environmentally friendly hydrogen, minimizing carbon emissions. The electrolysis of water heavily relies on an effective and steady oxygen evolution reaction (OER) taking place at the anode. Herein, we introduce a highly promising catalyst for OER called CoSe2@NiFeOOH arrays, which are supported on nickel foam. This catalyst, referred to as CoSe2@NiFeOOH/NF, is fabricated through a two-step process involving the selenidation of a Co-based porous metal organic framework and subsequent electrochemical deposition on nickel foam. The CoSe2@NiFeOOH/NF catalyst demonstrates outstanding activity for the OER in an alkaline electrolyte. It exhibits a low overpotential (η) of 254 mV at 100 mA cm-2, a small Tafel slope of 73 mV dec-1, and excellent high stability. The good performance of CoSe2@NiFeOOH/NF can be attributed to the combination of the high conductivity of the inner layer and the synergistic effect between CoSe2 and NiFeOOH. This study offers an effective method for the fabrication of highly efficient catalysts for an OER.

10.
Dalton Trans ; 52(36): 12668-12676, 2023 Sep 19.
Artigo em Inglês | MEDLINE | ID: mdl-37646195

RESUMO

Designing highly-efficient, cost-effective, and stable electrocatalysts for water splitting is essential to producing green hydrogen. In this work, a nanoflower quaternary heterostructured Ni(NO3)2(OH)4/Ni(OH)2/Ni3S2/NiFe-LDH electrocatalyst is successfully synthesized by two-step hydrothermal reactions. The sulfur in the electrocatalyst induces higher valence state metal atoms as active sites to accelerate the formation of O2. As expected, benefiting from the unique structural features and solid electronic interactions, Ni(NO3)2(OH)4/Ni(OH)2/Ni3S2/NiFe-LDH exhibits remarkable oxygen evolution reaction performance with a low overpotential of 223 mV at a current density of 100 mA cm-2, a slight Tafel slope of 65.4 mV dec-1, and outstanding stability in alkaline media. Attractively, using Ni(NO3)2(OH)4/Ni(OH)2/Ni3S2/NiFe-LDH as both a cathode and an anode, the alkaline electrolyzer delivers a current density of 10 mA cm-2 only at a cell voltage of 1.67 V, accompanied by superior durability. This work provides a facile method for the rational design of high-performance quaternary electrocatalysts.

11.
Artigo em Inglês | MEDLINE | ID: mdl-36248404

RESUMO

Objective: The objective is to explore the action and mechanism of circ_0109046 on the malignant phenotypes of ovarian cancer cells. Methods: Circ_0109046 and miR-338-3p expression were detected by quantitative real-time polymerase chain reaction (qRT-PCR). In vitro assays were conducted to investigate the action of circ_0109046 and miR-338-3p on ovarian cancer cell growth and metastasis. Western blotting was utilized to investigate the contents of apoptosis-related markers. The binding between circ_0109046 and miR-338-3p was validated using dual-luciferase reporter assay. Results: Circ_0109046 was increased, while miR-338-3p content was decreased in ovarian cancer tissues. Deficiency of circ_0109046 or the upregulation of miR-338-3p was observed to weaken cell proliferative, migratory, and invasive abilities and elevated cell apoptosis rate in ovarian cancer. Circ_0109046 targetedly suppressed miR-338-3p. Down-regulation of miR-338-3p was able to reverse the repressing impacts of circ_0109046 silencing on ovarian cancer growth and mobility. Conclusion: Circ_0109046 silencing impaired the proliferation, migration, and invasion of ovarian cancer cells through negatively regulating miR-338-3p in vitro, indicating the potential implication of circ_0109046 in ovarian cancer progression.

12.
J Virol ; 84(6): 3023-32, 2010 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-20071585

RESUMO

The worst known H1N1 influenza pandemic in history resulted in more than 20 million deaths in 1918 and 1919. Although the underlying mechanism causing the extreme virulence of the 1918 influenza virus is still obscure, our previous functional genomics analyses revealed a correlation between the lethality of the reconstructed 1918 influenza virus (r1918) in mice and a unique gene expression pattern associated with severe immune responses in the lungs. Lately, microRNAs have emerged as a class of crucial regulators for gene expression. To determine whether differential expression of cellular microRNAs plays a role in the host response to r1918 infection, we compared the lung cellular "microRNAome" of mice infected by r1918 virus with that of mice infected by a nonlethal seasonal influenza virus, A/Texas/36/91. We found that a group of microRNAs, including miR-200a and miR-223, were differentially expressed in response to influenza virus infection and that r1918 and A/Texas/36/91 infection induced distinct microRNA expression profiles. Moreover, we observed significant enrichment in the number of predicted cellular target mRNAs whose expression was inversely correlated with the expression of these microRNAs. Intriguingly, gene ontology analysis revealed that many of these mRNAs play roles in immune response and cell death pathways, which are known to be associated with the extreme virulence of r1918. This is the first demonstration that cellular gene expression patterns in influenza virus-infected mice may be attributed in part to microRNA regulation and that such regulation may be a contributing factor to the extreme virulence of the r1918.


Assuntos
Vírus da Influenza A Subtipo H1N1/patogenicidade , Influenza Humana/epidemiologia , MicroRNAs/imunologia , Infecções por Orthomyxoviridae/epidemiologia , Orthomyxoviridae/patogenicidade , Animais , Proteína de Ligação ao Elemento de Resposta ao AMP Cíclico/metabolismo , Surtos de Doenças , Perfilação da Expressão Gênica , Regulação da Expressão Gênica , Humanos , Vírus da Influenza A Subtipo H1N1/genética , Vírus da Influenza A Subtipo H1N1/imunologia , Influenza Humana/imunologia , Influenza Humana/virologia , Interferon Tipo I/imunologia , Pulmão/imunologia , Pulmão/fisiologia , Pulmão/virologia , Camundongos , MicroRNAs/genética , Análise de Sequência com Séries de Oligonucleotídeos , Orthomyxoviridae/genética , Orthomyxoviridae/imunologia , Infecções por Orthomyxoviridae/imunologia , Infecções por Orthomyxoviridae/virologia
13.
Am J Pathol ; 175(3): 947-57, 2009 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-19700759

RESUMO

Liver regeneration after two-thirds partial hepatectomy (2/3 PH) results in synchronized proliferation of hepatocytes and rapid restoration of liver mass. Understanding the mechanisms that regulate this process has both biological and clinical importance. Using cDNA microarray analysis, we investigated whether gene activation after 2/3 PH is specifically related to liver growth and hepatocyte proliferation. We generated gene expression profiles at 4, 12, 20, and 30 hours after 2/3 PH and compared them with profiles obtained at the same time points after 1/3 PH, a procedure that causes minimal DNA replication. Surprisingly, a significant number of genes whose expression is altered after 2/3 PH are similarly up- or down-regulated after 1/3 PH, particularly at 4 hours. We identified a number of genes and transcription factors that are more highly expressed ("preferential expression") after 2/3 PH and show that a shift in transcriptional programs in the regenerating liver occurs between 4 and 12 hours after 2/3 PH, a time at which the decision to replicate appears to be made. These results show that the liver responds to PH with massive changes of gene expression, even in the absence of DNA replication. We suggest that the changes in gene expression during the first 4 to 6 hours after 2/3 PH may induce chromatin remodeling and facilitate the binding of new sets of transcription factors required for DNA replication.


Assuntos
Regulação da Expressão Gênica , Regeneração Hepática/genética , Fígado/fisiologia , Animais , Contagem de Células , Proliferação de Células , Montagem e Desmontagem da Cromatina , Replicação do DNA , Perfilação da Expressão Gênica , Hepatectomia , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Análise de Sequência com Séries de Oligonucleotídeos , Fatores de Tempo , Transcrição Gênica
14.
Am J Transl Res ; 12(10): 6445-6454, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33194042

RESUMO

OBJECTIVE: The dysregulation of deubiquitinating enzymes is important in the development of many cancers, including colorectal cancer (CRC). However, the precise function and potential mode of action of the deubiquitinating enzyme UCHL3 in CRC progression are poorly elucidated. METHODS: The expression levels of UCHL3 in patient samples were analyzed by western blotting, real-time PCR and immunohistochemistry and its association with overall survival was analyzed using Kaplan-Meier method. Colony formation, CCK-8 and Transwell were used to examine the effects of UCHL3 knockdown or over-expression on CRC cells growth, invasion and migration. The functional effects of UCHL3 and SOX12 on tumor growth were further examined using xenograft tumor mouse models in vivo. RESULTS: Here, we found high expression of UCHL3 in CRC tissues which showed an association with the development of tumor and CRC patient survival. Studies conducted in vitro showed that UCHL3 overexpression facilitates proliferation, invasion, migration, and EMT (epithelial-mesenchymal transition) in cells of CRC, and a knockdown of UCHL3 had a reverse effect. Likewise, experiments conducted in vivo also showed enhanced tumor growth due to UCHL3 overexpression. In addition, UCHL3 was found regulates SOX12 expression in CRC cells. PI3K/AKT/mTOR pathway is required for UCHL3-mediated SOX12 expression. Mechanically, UCHL3 regulates SOX12 via AKT/mTOR signaling pathway and facilitated tumor progression. CONCLUSION: UCHL3 plays an oncogenic role through the AKT/mTOR/SOX12 axis and can be considered as a potential target for therapy and CRC prognostic biomarker.

15.
Chemosphere ; 241: 125118, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31683416

RESUMO

Deltamethrin (DM) has become one of the most widely used insecticides in the world due to its low toxicity, high efficiency and low persistence in soil. However, it is still unknown whether DM exposure has any effects on the Hypothalamic-Pituitary-Thyroid (HPT) axis in adolescent mice. In this study, the open field test and circadian activity test showed that DM exposure increased activity. There was no significant difference between the groups in the light/dark box test and nest building test. Forced swimming test showed that after 6 and 12 mg kg-1 DM exposure 28 days, the immobility time was increased and the swimming time was reduced. After 6 mg kg-1 DM treatment, the thyroid stimulating hormone (TSH) content increased, and thyrotropin releasing hormone (TRH), triiodothyronine (T3) and thyroxine (T4) decreased. After exposure to 6 and 12 mg kg-1 DM, mRNA levels of HPT axis-related genes were destroyed. The histological examination showed that, the DM groups mice thyroid tissues appeared expanded thyroid follicles, scanty colloid and hyperplastic thyroid cells. Western blot results showed that the expression level of tyrosine hydroxylase (TH) protein decreased and the content of dopamine transporter (DAT) protein increased in DM treated mice striatum. Collectively, our results indicated that DM exposure could induce thyroid dysfunction and behavioral disorders in adolescent mice.


Assuntos
Transtornos Mentais/induzido quimicamente , Nitrilas/farmacologia , Piretrinas/farmacologia , Glândula Tireoide/fisiopatologia , Hormônios Tireóideos/metabolismo , Envelhecimento , Animais , Comportamento Animal/efeitos dos fármacos , Inseticidas/farmacologia , Masculino , Camundongos , Glândula Tireoide/metabolismo , Tireotropina/metabolismo , Hormônio Liberador de Tireotropina/metabolismo , Tiroxina/metabolismo , Tri-Iodotironina/metabolismo
16.
J Leukoc Biol ; 81(1): 328-35, 2007 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-17046970

RESUMO

We report the systematic use of large-scale cDNA microarrays to study the gene expression profiles of primary human peripheral blood monocytes (MONO) in comparison with in vitro-differentiated, M-CSF-induced MONO-derived macrophages (MAC) and primary human alveolar MAC (AM), obtained by bronchoalveolar lavage from the lungs of normal volunteers. These studies revealed large-scale differences in the gene expression profile between both MAC types (MAC and AM) and MONO. In addition, large differences were observed in the gene expression profiles of the two MAC types. Specifically, 21% of genes on the array (2904 out of 13,582) were differentially expressed between AM and MONO, and 2229 out of 13,583 probes were differentially expressed between MAC and AM. Our expression data show remarkable differences in gene expression between different MAC subpopulations and emphasize the heterogeneity of different MAC populations. This study underscores the need to scrutinize models of MAC biology for relevance to specific disease processes.


Assuntos
Perfilação da Expressão Gênica , Macrófagos Alveolares/metabolismo , Macrófagos/metabolismo , Monócitos/metabolismo , Análise de Sequência com Séries de Oligonucleotídeos/métodos , Adulto , Biomarcadores/análise , Feminino , Humanos , Masculino , Reprodutibilidade dos Testes , Reação em Cadeia da Polimerase Via Transcriptase Reversa
17.
Zhonghua Wai Ke Za Zhi ; 44(23): 1610-3, 2006 Dec 01.
Artigo em Zh | MEDLINE | ID: mdl-17359689

RESUMO

OBJECTIVE: To summarize the experience of surgical treatment of primary hepatolithiasis. METHODS: To analyze the clinical data, operation choice, postoperative complications of 2465 cases of primary hepatolithiasis retrospectively. RESULTS: Of the patients, 2034 received external drainage (82.5%) and 431 received internal drainage (17.5%) and 586 were performed adjunctive partial hepatectomy (23.8%). The postoperative complications were found in 211 cases (8.6%) and 17 cases (0.7%) died after the operation. One thousand seven hundred and sixty-seven cases (71.7%) have been followed up for 2 to 25 years, among them therapeutic effect of 1518 cases (85.9%) was excellent or good, 315 cases (17.8%) had residual stone and 115 cases (6.5%) recurred. CONCLUSIONS: It could decrease the incidence rate of complications, residual stone and recurrence in the patients with hepatolithiasis after surgical therapy to pinpoint the situs of the lithiasis and biliary stricture and managed properly before the surgery.


Assuntos
Ductos Biliares Intra-Hepáticos , Colelitíase/cirurgia , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Criança , Drenagem , Feminino , Seguimentos , Hepatectomia , Humanos , Masculino , Pessoa de Meia-Idade , Complicações Pós-Operatórias/prevenção & controle , Estudos Retrospectivos
18.
BMC Genomics ; 5: 87, 2004 Nov 08.
Artigo em Inglês | MEDLINE | ID: mdl-15533245

RESUMO

BACKGROUND: Microarray experiments are often performed with a small number of biological replicates, resulting in low statistical power for detecting differentially expressed genes and concomitant high false positive rates. While increasing sample size can increase statistical power and decrease error rates, with too many samples, valuable resources are not used efficiently. The issue of how many replicates are required in a typical experimental system needs to be addressed. Of particular interest is the difference in required sample sizes for similar experiments in inbred vs. outbred populations (e.g. mouse and rat vs. human). RESULTS: We hypothesize that if all other factors (assay protocol, microarray platform, data pre-processing) were equal, fewer individuals would be needed for the same statistical power using inbred animals as opposed to unrelated human subjects, as genetic effects on gene expression will be removed in the inbred populations. We apply the same normalization algorithm and estimate the variance of gene expression for a variety of cDNA data sets (humans, inbred mice and rats) comparing two conditions. Using one sample, paired sample or two independent sample t-tests, we calculate the sample sizes required to detect a 1.5-, 2-, and 4-fold changes in expression level as a function of false positive rate, power and percentage of genes that have a standard deviation below a given percentile. CONCLUSIONS: Factors that affect power and sample size calculations include variability of the population, the desired detectable differences, the power to detect the differences, and an acceptable error rate. In addition, experimental design, technical variability and data pre-processing play a role in the power of the statistical tests in microarrays. We show that the number of samples required for detecting a 2-fold change with 90% probability and a p-value of 0.01 in humans is much larger than the number of samples commonly used in present day studies, and that far fewer individuals are needed for the same statistical power when using inbred animals rather than unrelated human subjects.


Assuntos
Perfilação da Expressão Gênica/métodos , Genes/genética , Análise de Sequência com Séries de Oligonucleotídeos/métodos , Animais , Biomarcadores Tumorais/genética , Carcinoma Hepatocelular/genética , Hepacivirus/genética , Humanos , Fígado/química , Fígado/metabolismo , Fígado/virologia , Neoplasias Hepáticas/genética , Camundongos , Camundongos Endogâmicos , Modelos Estatísticos , RNA/genética , RNA Neoplásico/genética , Ratos , Ratos Endogâmicos , Tamanho da Amostra
19.
C R Biol ; 326(10-11): 1021-30, 2003.
Artigo em Inglês | MEDLINE | ID: mdl-14744109

RESUMO

We quantitatively address the effect of T7 RNA amplification on expression profiling data, and answer the following questions: (1) What fraction of genes sampled is amplified non-linearly? (2) What is the effect of RNA amplification on comparative expression measurements? (3) If there is amplification bias, is the bias dependent on the degree of amplification or the amount of starting material and (4) Does amplification increase the overall variability of the results? We show that while there is significant amplification bias, the bias is consistent and generally has little effect on array comparisons between amplified samples.


Assuntos
Técnicas de Amplificação de Ácido Nucleico , RNA/genética , Células HeLa , Humanos , Reprodutibilidade dos Testes
20.
Sci Data ; 1: 140033, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-25977790

RESUMO

The Systems Biology for Infectious Diseases Research program was established by the U.S. National Institute of Allergy and Infectious Diseases to investigate host-pathogen interactions at a systems level. This program generated 47 transcriptomic and proteomic datasets from 30 studies that investigate in vivo and in vitro host responses to viral infections. Human pathogens in the Orthomyxoviridae and Coronaviridae families, especially pandemic H1N1 and avian H5N1 influenza A viruses and severe acute respiratory syndrome coronavirus (SARS-CoV), were investigated. Study validation was demonstrated via experimental quality control measures and meta-analysis of independent experiments performed under similar conditions. Primary assay results are archived at the GEO and PeptideAtlas public repositories, while processed statistical results together with standardized metadata are publically available at the Influenza Research Database (www.fludb.org) and the Virus Pathogen Resource (www.viprbrc.org). By comparing data from mutant versus wild-type virus and host strains, RNA versus protein differential expression, and infection with genetically similar strains, these data can be used to further investigate genetic and physiological determinants of host responses to viral infection.


Assuntos
Interações Hospedeiro-Patógeno , Vírus da Influenza A , Influenza Humana/virologia , Infecções por Orthomyxoviridae/virologia , Animais , Coleta de Dados , Bases de Dados Factuais , Humanos , Vírus da Influenza A/patogenicidade , Vírus da Influenza A/fisiologia , Influenza Humana/fisiopatologia , Camundongos , Infecções por Orthomyxoviridae/fisiopatologia , Biologia de Sistemas
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