Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 95
Filtrar
1.
China CDC Wkly ; 5(8): 180-183, 2023 Feb 24.
Artigo em Inglês | MEDLINE | ID: mdl-37008671

RESUMO

Introduction: In November 2021, the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Omicron variant was identified as the variant of concern and has since spread globally, replacing other cocirculating variants. To better understand the dynamic changes in viral load over time and the natural history of the virus infection, we analyzed the expression of the open reading frames 1ab (ORF1ab) and nucleocapsid (N) genes in patients infected with Omicron. Methods: We included patients initially admitted to the hospital for SARS-CoV-2 infection between November 5 and December 25, 2022. We collected daily oropharyngeal swabs for quantitative reverse transcriptase-polymerase chain reaction tests using commercial kits. We depicted the cycle threshold (Ct) values for amplification of ORF1ab and N genes from individual patients in age-specific groups in a time series. Results: A total of 480 inpatients were included in the study, with a median age of 59 years (interquartile range, 42 to 78; range, 16 to 106). In the <45-year-old age group, the Ct values for ORF1ab and N gene amplification remained below 35 for 9.0 and 11.5 days, respectively. In the ≥80-year-old age group, the Ct values for ORF1ab and N genes stayed below 35 for 11.5 and 15.0 days, respectively, which was the longest among all age groups. The Ct values for N gene amplification took longer to rise above 35 than those for ORF1ab gene amplification. Conclusion: The time to test negative varied among different age groups, with viral nucleic acid shedding taking longer in older age groups compared to younger age groups. As a result, the time to resolution of Omicron infection increased with increasing age.

2.
Biomed Pharmacother ; 156: 113949, 2022 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-36411634

RESUMO

Autism spectrum disorder (ASD) is a complex neurodevelopmental disorder with a rapidly increasing global prevalence. Early unstable and immature microbiota are often observed in ASD patients, resulting in neurobehavioral dysfunction. Since the establishment of stable gut microbiota in early life falls into the same critical time window as neurodevelopment, manipulations of the gut microbiota during early life could become a promising strategy for ASD. Melatonin is an endogenous hormone and can restore gut microbial dysbiosis under various disease conditions. Here, we explored the effects of melatonin supplementation during early life on the gut microbiota of the offspring and the subsequent impact on ASD-associated behaviors. Using the valproic acid (VPA) - induced mouse model of autism, we found that melatonin supplementation during late gestation and early postnatal development rescued the social deficits of the offspring. In addition, melatonin restored gut microbial dysbiosis in the VPA-exposed offspring, which was characterized by the significant upregulation of Akkermansia spp. Furthermore, supplementation of Akkermansia spp. alleviated the social deficits induced by VPA exposure via activating the dopaminergic neurons in the ventral tegmental area. These findings discover a novel mechanism underlying the gut microbiota regulation of social behaviors and provide the biological basis for developing gut microbiota-based therapeutics for ASD.


Assuntos
Transtorno do Espectro Autista , Transtorno Autístico , Microbioma Gastrointestinal , Melatonina , Camundongos , Gravidez , Animais , Feminino , Transtorno Autístico/tratamento farmacológico , Melatonina/farmacologia , Melatonina/uso terapêutico , Disbiose/tratamento farmacológico , Transtorno do Espectro Autista/tratamento farmacológico , Modelos Animais de Doenças , Akkermansia , Ácido Valproico/farmacologia , Suplementos Nutricionais
3.
Curr Med Sci ; 42(4): 863-870, 2022 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-35678908

RESUMO

OBJECTIVE: Lianhuaqingwen and Shuanghuanglian are drug treatment options for Corona Virus Disease 2019 (COVID-19). In China, use of traditional Chinese medicine with Shuanghuanglian or Lianhuaqingwen (for them, forsythiaside is the active antiviral and antibacterial component) in combination with azithromycin is common for the treatment of pediatric pneumonia. It is important to understand the reason why the combination of these compounds is better than a single drug treatment. This study aimed to explore the pharmacokinetic interaction between forsythiaside and azithromycin. METHODS: Twelve male Sprague-Dawley rats were randomly divided into an experimental group (Forsythia suspensa extract and azithromycin) and a control group (a single dose of Forsythia suspensa extract in 5% glucose solution). Plasma samples were collected at scheduled time points, and the high-performance liquid chromatography combined with ultraviolet method was used to determine the plasma forsythiaside concentration. Non-compartmental analysis and population pharmacokinetic methods were used to investigate the forsythiaside pharmacokinetic difference between the experimental and control group. RESULTS: Compared with a single administration, the area under the curve and half-life of forsythiaside increased, and forsythiaside clearance decreased significantly after co-administration with azithromycin. The in vivo behavior of forsythiaside could be described by the one compartment model. The forsythiaside clearance decreased when combined with azithromycin. Visual evaluation and bootstrap results suggested that the final model was precise and stable. CONCLUSION: Co-administration of azithromycin can significantly decrease the forsythiaside clearance and increase drug exposure. A lower dose of azithromycin can obtain sufficient forsythiaside concentration to provide antiviral and antibacterial activity.


Assuntos
Azitromicina , Tratamento Farmacológico da COVID-19 , Animais , Antibacterianos/farmacologia , Antivirais , Azitromicina/farmacocinética , Glicosídeos , Humanos , Masculino , Ratos , Ratos Sprague-Dawley
4.
Phytomedicine ; 98: 153979, 2022 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-35176533

RESUMO

BACKGROUND: Capsule of alkaloids from leaf of Alstonia scholaris (CALAS) is a new investigational botanical drug (No. 2011L01436) for respiratory disease. Clinical population pharmacokinetics (PK), metabolomics and therapeutic data are essential to guide dosing in patients. Previous research has demonstrated the potential therapeutic effect of CALAS on acute bronchitis. Further clinical trial data are needed to verify its clinical efficacy, pharmacokinetics behavior, and influence of dosage and other factors. PURPOSE: To verify the clinical efficacy and explore the potential biomarkers related to CALAS treatment for acute bronchitis. MATERIALS AND METHODS: Oral CALAS was assessed in a randomized, double-blind, placebo-controlled trial. Fifty-five eligible patients were randomly assigned to four cohorts to receive 20, 40 or 80 mg, of CALAS three times daily for seven days, or placebo. Each CALAS cohort included 15 subjects, and the placebo group included 10 subjects. A population PK model of CALAS was developed using plasma with four major alkaloid components. Metabolomics analysis was performed to identify biomarkers correlated with the therapeutic effect of CALAS, and efficacy and safety were assessed based on clinical symptoms and adverse events. RESULTS: The symptoms of acute bronchitis were alleviated by CALAS treatment without serious adverse events or clinically significant changes in vital signs, electrocardiography or upper abdominal Doppler ultrasonography. Moreover, one compartment model with first-order absorption showed that an increase in aspartate transaminase will reduce the clearance (CL) of scholaricine, and picrinine CL was inversely proportional to body mass index, while 19-epischolaricine and vallesamine CL increased with aging. The serum samples from acute bronchitis patients at different time points were analyzed using UPLC-QTOF in combination with the orthogonal projection to latent structures-discriminant analysis, which indicated higher levels of lysophosphatidylcholines, lysophosphatidylethanolamines and amino acids with CALAS treatment than with placebo. CONCLUSION: This is the first study to evaluate the clinical efficacy and explored the potential biomarkers related to CALAS therapeutic mechanism of acute bronchitis by means of clinical trial combined the metabolomics study. This exploratory study provides a basis for further research on clinical efficacy and optimal dosing regimens based on pharmacokinetics behavior. Additional acute bronchitis patients and CALAS PK samples collected in future studies may be used to improve model performance and maximize its clinical value.

6.
Cell Cycle ; 20(1): 54-64, 2021 01.
Artigo em Inglês | MEDLINE | ID: mdl-33345691

RESUMO

Studies have extensively focused on the involvement of microRNAs (miRNAs) in cerebral ischemia/reperfusion (I/R) injury but not much on the specific role of miR-20a. Hence, this study is purposed to decipher whether miR-20a could regulate cadherin 1 (CDH1) to affect cerebral I/R injury in rats. Rat transient middle cerebral artery occlusion model (MCAO) was established. Rats were injected with lentiviral solution containing miR-20a inhibitor, or overexpressed CDH1 or combined depleted miR-20a and CDH1 to explore their roles in cerebral I/R injury. Oxidative stress-related factors, miR-20a, CDH1, nuclear factor-kappaB (NF-κB) and Nestin expression in brain tissues were detected by RT-qPCR and western blot assay. The target relation between miR-20a and CDH1 was predicted by online website and further confirmed by luciferase activity assay. In rats with cerebral I/R injury, increased miR-20a and decreased CDH1 were found in brain tissues. Reduction of miR-20a or elevation of CDH1 attenuated behavior function in MCAO rats. Inhibiting miR-20a or restoring CDH1 restrained oxidative stress, attenuated pathological damage of neurons, promoted neuron survival, and down-regulated NF-κB and Nestin expression in brain tissues of MCAO rats. CDH1 was determined to a target gene of miR-20a. This study elucidates that down-regulating miR-20a elevates CDH1 to protect neurons from cerebral I/R injury, which paves a new way for treatment of cerebral I/R injury.


Assuntos
Isquemia Encefálica/genética , Caderinas/genética , Regulação para Baixo/genética , MicroRNAs/genética , Traumatismo por Reperfusão/genética , Animais , Apoptose/genética , Sobrevivência Celular/genética , Modelos Animais de Doenças , Infarto da Artéria Cerebral Média/genética , Masculino , NF-kappa B/genética , Neurônios/patologia , Estresse Oxidativo/genética , Ratos , Ratos Sprague-Dawley , Regulação para Cima/genética
7.
Front Immunol ; 11: 1281, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32765489

RESUMO

Background: The tumor microenvironment (TME) of human glioblastoma (GBM) exhibits considerable immune cell infiltration, and such cell types have been shown to be widely involved in the development of GBM. Here, weighted correlation network analysis (WGCNA) was performed on publicly available datasets to identify immune-related molecules that may contribute to the progression of GBM and thus be exploited as potential therapeutic targets. Methods: WGCNA was used to identify highly correlated gene clusters in Chinese Glioma Genome Atlas glioma dataset. Immune-related genes in significant modules were subsequently validated in the Cancer Genome Atlas (TCGA) and Rembrandt databases, and impact on GBM development was examined in migration and vascular mimicry assays in vitro and in an orthotopic xenograft model (GL261 luciferase-GFP cells) in mice. Results: WGCNA yielded 14 significant modules, one of which (black) contained genes involved in immune response and extracellular matrix formation. The intersection of these genes with a GO immune-related gene set yielded 47 immune-related genes, five of which exhibited increased expression and association with worse prognosis in GBM. One of these genes, TREM1, was highly expressed in areas of pseudopalisading cells around necrosis and associated with other proteins induced in angiogenesis/hypoxia. In macrophages induced from THP1 cells, TREM1 expression levels were increased under hypoxic conditions and associated with markers of macrophage M2 polarization. TREM1 siRNA knockdown in induced macrophages reduced their ability to promote migration and vascular mimicry in GBM cells in vitro, and treatment of mice with LP-17 peptide, which blocks TREM1, inhibited growth of GL261 orthotopic xenografts. Finally, blocking the cytokine receptor for CSF1 in induced macrophages also impeded their potential to promote tumor migration and vascular mimicry in GBM cells. Conclusions: Our results demonstrated that TREM1 could be used as a novel immunotherapy target for glioma patients.


Assuntos
Biomarcadores Tumorais , Regulação Neoplásica da Expressão Gênica , Redes Reguladoras de Genes , Predisposição Genética para Doença , Glioblastoma/genética , Glioblastoma/imunologia , Imunidade/genética , Animais , Linhagem Celular Tumoral , Movimento Celular , Biologia Computacional , Bases de Dados Genéticas , Modelos Animais de Doenças , Progressão da Doença , Imunofluorescência , Perfilação da Expressão Gênica , Inativação Gênica , Glioblastoma/mortalidade , Glioblastoma/patologia , Humanos , Camundongos , Neovascularização Patológica/genética , Neovascularização Patológica/metabolismo , Prognóstico , Transcriptoma , Receptor Gatilho 1 Expresso em Células Mieloides/genética
8.
Chin J Nat Med ; 18(3): 234-240, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32245594

RESUMO

Azithromycin and Chinese medicine forsythia are often used together to treat pediatric mycoplasma infections in China. We aimed to investigate the pharmacokinetic interaction of Forsythia suspensa extract and azithromycin after single and co-intravenous administration in rats. Male Sprague-Dawley rats received single (Forsythia suspensa extract or azithromycin) treatment or co-administration of Forsythia suspensa extract and azithromycin. Blood samples were collected at scheduled times, and drug concentrations were determined by HPLC-UV or HPLC-MS/MS methods. Both non-compartmental analyses and nonlinear mixed-effects modeling approaches were applied to fit pharmacokinetic data and evaluate the impact of co-administration. Pharmacokinetic analysis showed that the area under the curve of azithromycin and forsythiaside increased, and clearance decreased significantly (P < 0.05), after co-administration. The in vivo behavior of both azithromycin and forsythiaside could be appropriately described by the two-compartmental model. The final population pharmacokinetic model indicated that co-administration decreased the central volume of azithromycin and forsythiaside clearance significantly. Co-administration of Forsythia suspensa extract and azithromycin significantly decreased the clearance and increased exposure for both drugs. Pharmacokinetic data suggest that drug co-administration may increase efficiency.


Assuntos
Azitromicina/farmacocinética , Glicosídeos/farmacocinética , Extratos Vegetais/farmacocinética , Administração Intravenosa , Animais , Área Sob a Curva , Quimioterapia Combinada , Forsythia/química , Masculino , Ratos Sprague-Dawley
10.
J Pharm Sci ; 108(12): 3923-3931, 2019 12.
Artigo em Inglês | MEDLINE | ID: mdl-31562869

RESUMO

Because voriconazole metabolism is highly influenced by liver function, the dose regimen of voriconazole should be carefully assessed in patients with liver cirrhosis. We aimed to identify significant factors associated with plasma concentrations. Blood samples were collected from patients with liver cirrhosis who received voriconazole, and voriconazole concentrations were determined. One-compartment model with first-order absorption and elimination appropriately characterized the in vivo process of voriconazole. The typical population value of voriconazole clearance (CL) was 1.45 L/h and the volume of distribution (V) was 132.12 L. The covariate analysis identified that CYP2C19 gene phenotype and Child-Pugh classification were strongly associated with CL and body weight had a significant influence on V. The results of the Monte Carlo simulation suggested that CYP2C19 gene phenotype was a critical factor for determining voriconazole dosage in patients with liver cirrhosis. The extensive metabolizer patients with Aspergillus fumigatus infections could be treated effectively with a recommended dose of 75 mg twice daily in mild to moderate liver cirrhosis and 100 mg once daily in moderate severe liver cirrhosis. However, the recommended dosage for Candida albicans infections patients was not achieved in present study.


Assuntos
Antifúngicos/farmacocinética , Cirrose Hepática/metabolismo , Voriconazol/farmacocinética , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Citocromo P-450 CYP2C19/metabolismo , Feminino , Humanos , Masculino , Testes de Sensibilidade Microbiana , Pessoa de Meia-Idade , Método de Monte Carlo , Fenótipo , Estudos Retrospectivos , Adulto Jovem
11.
EBioMedicine ; 43: 159-170, 2019 May.
Artigo em Inglês | MEDLINE | ID: mdl-30987862

RESUMO

BACKGROUND: Dysregulation of immune checkpoint molecules leads to immune evasion in human tumours but has become a viable target for tumour therapy. Here, we examined expression of Herpes virus entry mediator (HVEM), an immune checkpoint molecule, in human glioblastoma (GBM) to assess its potential as a molecular target for treatment. METHODS: Molecular and clinical data from publicly available genomic databases containing WHO grade II-IV human glioma cases (n = 1866) were analyzed. Immunohistochemistry was applied to assess HVEM protein levels in primary tumour sections. Statistical analysis was performed using Matlab and R language. FINDINGS: HVEM was found to be elevated in aggressive gliomas, particularly in the mesenchymal and isocitrate dehydrogenase (IDH) wild-type molecular subtypes of GBM. HVEMhigh tumours tended to be associated with amplification of EGFR and loss of PTEN, while HVEMlow tumours harbored mutations in IDH1 (93%). HVEM exhibited potential as a prognostic marker based on Cox regression and nomogram models. HVEM displayed intra-tumour heterogeneity and was more highly expressed in peri-necrotic and microvascular regions. Gene ontology and pathway analysis revealed enrichment of HVEM in multiple immune regulatory processes, such as suppression of T cell mediated immunity in GBM. Finally, in cell lineage analysis, HVEM was found to be tightly associated with several infiltrating immune and stromal cell types which localized to the tumour microenvironment. INTERPRETATION: Our data highlights the importance of HVEM in the development of GBM and as a potential molecular target in combination with current immune checkpoint blockades for treatment of GBM.


Assuntos
Biomarcadores Tumorais , Regulação Neoplásica da Expressão Gênica , Glioblastoma/genética , Glioblastoma/mortalidade , Membro 14 de Receptores do Fator de Necrose Tumoral/genética , Progressão da Doença , Heterogeneidade Genética , Variação Genética , Genômica/métodos , Glioblastoma/imunologia , Glioblastoma/patologia , Humanos , Imuno-Histoquímica , Imunomodulação/genética , Estimativa de Kaplan-Meier , Gradação de Tumores , Prognóstico , Células Estromais/metabolismo , Linfócitos T/imunologia , Linfócitos T/metabolismo , Microambiente Tumoral/genética , Microambiente Tumoral/imunologia
13.
Front Neurosci ; 12: 329, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29872374

RESUMO

Hereditary Inclusion Body Myopathy (HIBM) is a rare autosomal dominant or recessive adult onset muscle disease which affects one to three individuals per million worldwide. This disease is autosomal dominant or recessive [corrected] and occurs in adulthood. Our previous study reported a new subtype of HIBM linked to the susceptibility locus at 7q22.1-31.1. The present study is aimed to identify the candidate gene responsible for the phenotype in HIBM pedigree. After multipoint linkage analysis, we performed targeted capture sequencing on 16 members and whole-exome sequencing (WES) on 5 members. Bioinformatics filtering was performed to prioritize the candidate pathogenic gene variants, which were further genotyped by Sanger sequencing. Our results showed that the highest peak of LOD score (4.70) was on chromosome 7q22.1-31.1.We identified 2 and 22 candidates using targeted capture sequencing and WES respectively, only one of which as CFTRc.1666A>G mutation was well cosegregated with the HIBM phenotype. Using transcriptome analysis, we did not detect the differences of CFTR's mRNA expression in the proband compared with healthy members. Due to low incidence of HIBM and there is no other pedigree to assess, mutation was detected in three patients with duchenne muscular dystrophyn (DMD) and five patients with limb-girdle muscular dystrophy (LGMD). And we found that the frequency of mutation detected in DMD and LGMD patients was higher than that of being expected in normal population. We suggested that the CFTRc.1666A>G may be a candidate marker which has strong genetic linkage with the causative gene in the HIBM family.

14.
Exp Ther Med ; 15(1): 39-46, 2018 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29399056

RESUMO

Cryptogenic organizing pneumonia (COP) is a rare pulmonary disorder of unknown etiology. COP with hemoptysis as the primary presenting symptom has rarely been reported. The present study reported a case of COP that resembled lung carcinoma with hemoptysis as the only clinical symptom. The patient recovered well following thoracoscope surgery. A literature review of 119 COP cases between 1995 and 2015 was presented. Cough, fever and dyspnea were the most common clinical manifestations. The most common imaging manifestations were multiple or single consolidation, lung nodules, migratory sign, reversed halo sign, and multiple ground-glass opacity. A total of 3 cases exhibited COP accompanied by lung cancer. Glucocorticoids were effective for the majority of cases and invasive surgeries were implemented in most cases. The majority of cases recovered or relieved, and the prognosis of COP was relatively good. COP was easily confused with lung tumor and it is necessary to make differential diagnosis between COP and lung cancer. Invasive surgery should be avoided when possible to avoid or reduce patient trauma.

15.
J Exp Clin Cancer Res ; 36(1): 162, 2017 Nov 16.
Artigo em Inglês | MEDLINE | ID: mdl-29145888

RESUMO

BACKGROUND: Glioblastoma multiforme (GBM) is characterized by lethal aggressiveness and patients with GBM are in urgent need for new therapeutic avenues to improve quality of life. Current studies on tumor invasion focused on roles of cytokines in tumor microenvironment and numerous evidence suggests that TGF-ß2 is abundant in glioma microenvironment and vital for glioma invasion. Autopagy is also emerging as a critical factor in aggressive behaviors of cancer cells; however, the relationship between TGF-ß2 and autophagy in glioma has been poorly understood. METHODS: U251, T98 and U87 GBM cell lines as well as GBM cells from a primary human specimen were used in vitro and in vivo to evaluate the effect of TGF-ß2 on autophagy. Western blot, qPCR, immunofluorescence and transmission-electron microscope were used to detect target molecular expression. Lentivirus and siRNA vehicle were introduced to establish cell lines, as well as mitotracker and seahorse experiment to study the metabolic process in glioma. Preclinical therapeutic efficacy was evaluated in orthotopic xenograft mouse models. RESULTS: Here we demonstrated that TGF-ß2 activated autophagy in human glioma cell lines and knockdown of Smad2 or inhibition of c-Jun NH2-terminal kinase, attenuated TGF-ß2-induced autophagy. TGF-ß2-induced autophagy is important for glioma invasion due to the alteration of epithelial-mesenchymal transition and metabolism conversion, particularly influencing mitochondria trafficking and membrane potential (△Ψm). Autopaghy also initiated a feedback on TGF-ß2 in glioma by keeping its autocrine loop and affecting Smad2/3/7 expression. A xenograft model provided additional confirmation on combination of TGF-ß inhibitor (Galunisertib) and autophagy inhibitor (CQ) to better "turn off" tumor growth. CONCLUSION: Our findings elucidated a potential mechanism of autophagy-associated glioma invasion that TGF-ß2 could initiate autophagy via Smad and non-Smad pathway to promote glioma cells' invasion.


Assuntos
Autofagia , Neoplasias Encefálicas/patologia , Glioblastoma/patologia , Transdução de Sinais , Fator de Crescimento Transformador beta2/metabolismo , Animais , Autofagia/efeitos dos fármacos , Neoplasias Encefálicas/metabolismo , Linhagem Celular Tumoral , Cloroquina/administração & dosagem , Cloroquina/farmacologia , Transição Epitelial-Mesenquimal/efeitos dos fármacos , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Glioblastoma/tratamento farmacológico , Glioblastoma/metabolismo , Humanos , Potencial da Membrana Mitocondrial/efeitos dos fármacos , Camundongos , Proteína Quinase 9 Ativada por Mitógeno/metabolismo , Invasividade Neoplásica , Transplante de Neoplasias , Pirazóis/administração & dosagem , Pirazóis/farmacologia , Qualidade de Vida , Quinolinas/administração & dosagem , Quinolinas/farmacologia , Transdução de Sinais/efeitos dos fármacos , Proteínas Smad/metabolismo , Regulação para Cima/efeitos dos fármacos
16.
J Exp Clin Cancer Res ; 36(1): 155, 2017 11 06.
Artigo em Inglês | MEDLINE | ID: mdl-29110682

RESUMO

BACKGROUND: Transgelin-2 (TAGLN2) is a member of the calponin family of actin-bundling proteins that is involved in the regulation of cell morphology, motility, and cell transformation. Here, the clinical significance and potential function of TAGLN2 in malignant gliomas were investigated. METHODS: Molecular and clinical data was obtained from The Cancer Genome Atlas (TCGA) database. Gene ontology and pathway analysis was used to predict potential functions of TAGLN2. RNA knockdown was performed using siRNA or lentiviral contructs in U87MG and U251 glioma cell lines. Cells were characterized in vitro or implanted in vivo to generate orthotopic xenografts in order to assess molecular status, cell proliferation/survival, and invasion by Western blotting, flow cytometry, and 3D tumor spheroid invasion assay, respectively. RESULTS: Increased TAGLN2 expression was associated with increasing tumor grade (P < 0.001), the mesenchymal molecular glioma subtype and worse prognosis in patients (P < 0.001). Immunohistochemistry performed with anti-TAGLN2 on an independent cohort of patients (n = 46) confirmed these results. Gene silencing of TAGLN2 in U87MG and U251 significantly inhibited invasion and tumor growth in vitro and in vivo. Western blot analysis revealed that epithelial-mesenchymal transition (EMT) molecular markers, such as N-cadherin, E-cadherin, and Snail, were regulated in a manner corresponding to suppression of the EMT phenotype in knockdown experiments. Finally, TAGLN2 was induced ~ 2 to 3-fold in U87MG and U251 cells by TGFß2, which was also elevated in GBM and highly correlated with TAGLN2 mRNA levels (P < 0.001). CONCLUSIONS: Our findings indicate that TAGLN2 exerts a role in promoting the development of human glioma. The regulation and function of TAGLN2 therefore renders it as a candidate molecular target for the treatment of GBM.


Assuntos
Biomarcadores Tumorais/genética , Neoplasias Encefálicas/patologia , Glioma/patologia , Proteínas dos Microfilamentos/genética , Proteínas Musculares/genética , Regulação para Cima , Animais , Biomarcadores Tumorais/metabolismo , Neoplasias Encefálicas/genética , Neoplasias Encefálicas/metabolismo , Linhagem Celular Tumoral , Proliferação de Células , Progressão da Doença , Transição Epitelial-Mesenquimal , Feminino , Regulação Neoplásica da Expressão Gênica , Glioma/genética , Glioma/metabolismo , Humanos , Masculino , Camundongos , Proteínas dos Microfilamentos/metabolismo , Proteínas Musculares/metabolismo , Gradação de Tumores , Invasividade Neoplásica , Transplante de Neoplasias , Prognóstico
18.
Postgrad Med J ; 93(1103): 555-559, 2017 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-28280103

RESUMO

INTRODUCTION: The risk of recurrent ischaemic events is related to platelet function, which is often assessed by thromboelastography (TEG). TEG has high interindividual variability. OBJECTIVE: To identify causal variants associated with TEG parameters in patients who receive aspirin and clopidogrel after intra- or extracranial stenting. METHODS: Patients who underwent stenting for extracranial or intracranial stenosis (70-99%) were recruited into the study. Blood samples were obtained for TEG to assess the platelet function before stenting. Aspirin- and clopidogrel-related genetic polymorphisms were determined by the MassARRAY method. Minor allele frequency and Hardy-Weinberg equilibrium (HWE) tests and linkage disequilibrium (LD) analysis were carried out. The influences of genetic polymorphism on TEG parameters were analysed by linear regression. RESULTS: A total of 249 patients were included in this study. Twenty-two selected single nucleotide polymorphisms (SNPs) were genotyped, and no significant deviation from HWE was found for any SNP in the study patients. Four SNPs-rs2104543, rs12772169, rs1998591 and rs1042194-within CYP2C18 were in high LD, and the genetic polymorphisms had a significant impact on the TEG parameters maximal clot strength (MAThrombin) and ADP-induced platelet-fibrin clot strength (MAADP). Patients who carried the loss-of-function CYP2C19*2 (rs4244285) allele were also at risk of increased MAThrombin and MAADP. CONCLUSIONS: Testing for these polymorphisms may be valuable in the identification of patients at high risk of recurrent ischaemic events. Alternative treatments may be considered for these high-risk patients. TRIAL REGISTRATION NUMBER: NCT01925872.


Assuntos
Isquemia Encefálica/genética , Isquemia Encefálica/terapia , Polimorfismo de Nucleotídeo Único , Stents , Acidente Vascular Cerebral/genética , Acidente Vascular Cerebral/terapia , Adulto , Idoso , Idoso de 80 Anos ou mais , Alelos , Aspirina/administração & dosagem , Clopidogrel , Feminino , Variação Genética , Genótipo , Humanos , Desequilíbrio de Ligação , Masculino , Pessoa de Meia-Idade , Inibidores da Agregação Plaquetária/administração & dosagem , Recidiva , Tromboelastografia , Ticlopidina/administração & dosagem , Ticlopidina/análogos & derivados
19.
Oncol Rep ; 37(2): 903-912, 2017 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-28075478

RESUMO

The Ras-related GTP-binding protein (RAB) family plays an important role in regulating signal transduction and cellular processes including vesicle transport, cytoskeleton formation and membrane trafficking. More recently, several RAB members have been reported to promote tumorigenesis in many types of cancers. However, the clinical significance and potential function of RAB43 in gliomas remain unclear. Herein, we found that RAB43 was upregulated and positively correlated with the grade of progression in glioma patients by in silico analysis and immunohistochemistry (IHC). Patients with high RAB43 displayed worse clinical outcomes in comparison to those with low RAB43. RAB43 was also highly expressed in mesenchymal and G3 subtypes, and isocitrate dehydrogenase 1 (IDH1) wild-type gliomas. Moreover, transcriptomic analyses via Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways revealed that RAB43­related gene sets were mainly involved in the regulation of cell adhesion and cell migration processes. Further investigation indicated that RAB43 downregulation significantly suppressed the migratory and invasive ability of glioma cells, as well as decreased the expression of epithelial-mesenchymal transition (EMT) markers (N-cadherin, vimentin and Snail). In conclusion, a high level of RAB43 was significantly associated with the malignant phenotypes of gliomas, which suggests that RAB43 may serve as a novel biomarker and a potential therapeutic target for gliomas.


Assuntos
Biomarcadores Tumorais/metabolismo , Neoplasias Encefálicas/patologia , Transição Epitelial-Mesenquimal , Glioma/patologia , Proteínas rab de Ligação ao GTP/metabolismo , Biomarcadores Tumorais/genética , Western Blotting , Neoplasias Encefálicas/genética , Neoplasias Encefálicas/metabolismo , Adesão Celular , Movimento Celular , Progressão da Doença , Feminino , Seguimentos , Perfilação da Expressão Gênica , Regulação Neoplásica da Expressão Gênica , Glioma/genética , Glioma/metabolismo , Humanos , Técnicas Imunoenzimáticas , Masculino , Pessoa de Meia-Idade , Gradação de Tumores , Prognóstico , Taxa de Sobrevida , Células Tumorais Cultivadas , Proteínas rab de Ligação ao GTP/genética
20.
J Neurointerv Surg ; 9(2): 192-195, 2017 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-26041100

RESUMO

BACKGROUND AND PURPOSE: Thrombelastography (TEG) is widely used for the measurement of platelet function. However, few studies have investigated the TEG parameters in patients receiving extracranial or intracranial artery stenting for ischemic cerebrovascular disease. This study sought to describe the association of TEG parameters before the procedure with post-procedural ischemic events after extracranial or intracranial artery stenting. METHODS: Patients in whom stenting was performed for extracranial or intracranial artery stenosis (70-99%) were recruited into the study. Blood samples were obtained for TEG to assess platelet function before stenting. The primary endpoint was ischemic stroke or transient ischemic attack in the territory of the stented artery. RESULTS: A total of 218 patients were included in the study. During a mean follow-up period of 132 days (range 98-226 days), 18 (8.3%) primary endpoint events were recorded. Compared with patients without ischemic events, the ADP-induced platelet-fibrin clot strength (MAADP) was significantly higher (41.57±15.10 vs 33.50±13.86, p=0.020) and the ADP inhibition rate (ADP%) was significantly lower in patients with ischemic events (39.54±23.15 vs 55.29±24.43, p=0.009). Multivariate analysis identified MAADP and ADP% as significant independent predictors of subsequent ischemic events with HRs of 1.036 and 0.965, respectively. From receiver operating characteristic curve analysis, MAADP >49.95 mm had the best predictive value of ischemic events. CONCLUSIONS: Our study suggests that TEG parameters MAADP and ADP% are associated with subsequent ischemic events in patients with extracranial or intracranial stents. CLINICAL TRIAL NUMBER: NCT01925872.


Assuntos
Isquemia Encefálica/diagnóstico , Stents/efeitos adversos , Tromboelastografia/métodos , Difosfato de Adenosina/farmacologia , Idoso , Estudos de Coortes , Constrição Patológica , Determinação de Ponto Final , Feminino , Seguimentos , Humanos , Ataque Isquêmico Transitório , Masculino , Pessoa de Meia-Idade , Inibidores da Agregação Plaquetária/uso terapêutico , Testes de Função Plaquetária , Valor Preditivo dos Testes , Estudos Prospectivos , Análise de Sobrevida , Tromboelastografia/normas
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...