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Chemotherapy resistance to colon cancer is an unavoidable obstacle in the clinical management of the disease. Clitocine, an adenosine analog, played a significant role in the chemosensitivity of human colon cancer cells by promoting MCL-1 protein degradation. However, the detailed mechanism remains to be further elucidated. We found that clitocine up-regulates the expression of FBXW7, a ubiquitin ligase involved in the MCL-1 degradation. Transcriptome sequencing analysis revealed that clitocine significantly inhibits the cAMP and ERK downstream signaling pathways in colon cancer cells, thereby enhancing FBXW7 expression and subsequently promoting the ubiquitination degradation of MCL-1 protein. We verified that clitocine regulated intracellular cAMP levels by competitive binding with the adenosine receptor A2B. Molecular docking assay also verified the binding relationship. By decreasing intracellular cAMP levels, clitocine blocks the activation of downstream signaling pathways, which ultimately enhances the drug sensitivity of colon cancer cells through increased FBXW7 expression due to the inhibition of its promoter DNA methylation. Both knock-out of adenosine receptor A2B and Br-cAMP treatment can effectively attenuate the function of clitocine in vitro and in vivo. This study clarified that clitocine enhanced the drug sensitivity of colon cancer cells by promoting FBXW7-mediated MCL-1 degradation via inhibiting the A2B/cAMP/ERK axis, providing further knowledge of the clinical application for clitocine.
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A phase error correction method is proposed to compensate for the phase error in super-resolution correlated imaging based on metamaterial antennas. The varying carrier frequencies of a metamaterial antenna can generate the random radiation field for super-resolution correlation imaging, but the variation of the signal carrier frequency leads to large phase errors in the imaging results. In this proposed method, the sampling matrix in the super-resolution correlated imaging algorithm is used to compensate for the phase errors. Each element of the matrix is multiplied by a compensation phase corresponding to the phase error, and the error is subtly removed from the algorithm. In the experiment, the antenna pattern at each frequency of the metamaterial antenna is measured and recorded. In addition, an external field experiment is also carried out, and the collected data are imaged with the improved algorithm. Experimental results show that this technology can effectively solve the effect of phase errors on imaging results caused by signal carrier frequency changes.
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Deoxynivalenol (DON) or "vomitoxin" is a mycotoxin produced by Fusarium species. Few food poisoning cases caused by DON have been reported since the 1990s in China. However, on May 16, 2019, the Zhuhai Center for Disease Control and Prevention received a case report from primary school "S" that many students began vomiting after eating breakfast. To discern the cause and control the outbreak effectively, an epidemiological investigation was carried out. This retrospective cohort study defined both suspected and probable cases of food poisoning using ultra-high-performance liquid chromatography coupled with triple quadrupole mass spectrometry to detect 16 mycotoxins simultaneously. A total of 101 cases (14 suspected and 87 probable) were identified, with an overall attack rate of 8.1%. All cases were in grades 1-3. The main symptoms of probable cases were vomiting (100%) and nausea (63%). The average incubation time was 25 min after eating. Comparison of students who ate breakfast provided by the school with those who did not revealed the relative risk was 6.0 (95% confidence intervals [CI] = 2.2-16) among students in grades 1-3. The concentration of DON in the leftover raw breakfast noodles ranged from 6856 to 11,982 µg/kg and 878.3 to 1074.2 µg/kg in leftover cooked noodles. DON exposure was 1.3-1.6 µg/kg body weight for grades 1-2 and 1.7-2.1 µg/kg body weight for grade 3. The attack rate of grade 3 was 4.3 times higher than that for grades 1-2 (95% CI = 3.0-6.3). The food poisoning outbreak on May 16, 2019 in primary school "S" in China, was determined to be caused by DON-contaminated commercial raw noodles.
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Contaminação de Alimentos/análise , Microbiologia de Alimentos/estatística & dados numéricos , Doenças Transmitidas por Alimentos/microbiologia , Micotoxinas/toxicidade , Tricotecenos/toxicidade , Criança , China , Cromatografia Líquida de Alta Pressão , Feminino , Serviços de Alimentação , Doenças Transmitidas por Alimentos/epidemiologia , Humanos , Masculino , Micotoxinas/análise , Estudos Retrospectivos , Serviços de Saúde Escolar , Instituições Acadêmicas , Espectrometria de Massas em Tandem , Tricotecenos/análiseRESUMO
BACKGROUND Microvascular endothelial inflammation and apoptosis are responsible for septic acute lung injury (ALI). Ripasudil is a novel Rho/Rho kinase (ROCK) inhibitor which shows therapeutic effects on several vascular diseases. The aim of this study was to investigate the protective effects and correlated molecular mechanisms of ripasudil on lipopolysaccharide- induced inflammation and apoptosis of pulmonary microvascular endothelial cells (PMVECs). MATERIAL AND METHODS Cultured PMVECs were exposed to lipopolysaccharide (LPS). Ripasudil at various concentrations was used to treat the cells. Several cells were also co-administrated with the endothelial nitric oxide synthase (eNOS) inhibitor Nω-Nitro-L-arginine methyl ester hydrochloride (L-NAME). Cell viability was assessed by MTT assay. Terminal dUTP transferase nick-end labeling (TUNEL) assay was used to detect the apoptosis. The colorimetric method was used to measure the activity of eNOS and ROCK2. Protein phosphorylation and expression were assessed by Western blotting. RESULTS Ripasudil attenuated the LPS-induced inflammation and apoptosis in PMVECs, which was reversed by L-NAME. Ripasudil suppressed ROCK2 activity and further increased the eNOS activity. Ripasudil treatment increased the phosphorylation of eNOS, increased the expression level of Bcl2, and decreased the expression level of active caspase3 in LPS-treated PMVECs. Moreover, the ripasudil treatment also inhibited the nuclear translocation of NF-κB and further suppressed the levels of interleukin (IL) 6 and tumor necrosis factor (TNF) α. The co-treatment with L-NAME, however, impaired the anti-apoptotic and anti-inflammatory effects of ripasudil on PMVECs without affecting ROCK2. CONCLUSIONS The novel ROCK2 inhibitor ripasudil suppressed LPS-induced apoptosis and inflammation in PMVECs by regulating the ROCK2/eNOS signaling pathway.
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Apoptose/efeitos dos fármacos , Células Endoteliais/patologia , Inflamação/patologia , Isoquinolinas/farmacologia , Lipopolissacarídeos/toxicidade , Pulmão/patologia , Óxido Nítrico Sintase Tipo III/metabolismo , Sulfonamidas/farmacologia , Quinases Associadas a rho/metabolismo , Caspase 3/metabolismo , Sobrevivência Celular/efeitos dos fármacos , Células Endoteliais/efeitos dos fármacos , Células Endoteliais/enzimologia , Humanos , Interleucina-6/metabolismo , Modelos Biológicos , NG-Nitroarginina Metil Éster/farmacologia , Proteínas Proto-Oncogênicas c-bcl-2/metabolismo , Transdução de Sinais/efeitos dos fármacos , Fator de Necrose Tumoral alfa/metabolismoRESUMO
Among anti-cancer candidate drugs, TRAIL might be the most specific agent against cancer cells due to its low toxicity to normal cells. Unfortunately, cancer cells usually develop drug resistance to TRAIL, which is a major obstacle for its clinical application. One promising strategy is co-administrating with sensitizer to overcome cancer cells resistance to TRAIL. Clitocine, a natural amino nucleoside purified from wild mushroom, is recently demonstrated that can induce apoptosis in multidrug-resistant human cancer cells by targeting Mcl-1. In the present study,we found that pretreatment with clitocine dramatically enhances TRAIL lethality in its resistant human colon cancer cells by inducing apoptosis. More importantly, combination of clitocine and TRAIL also effectively inhibits xenograft growth and induces tumor cells apoptosis in athymic mice. The disruption of the binding between Mcl-1 and Bak as well as mitochondrial translocation of Bax mediated by clitocine are identified as the key underlying mechanisms, which leading to mitochondrial membrane permeabilization. Enforced exogenous Mcl-1 can effectively attenuate clitocine/TRAIL-induced apoptosis by suppressing the activation of intrinsic apoptotic pathway. Furthermore, clitocine regulates Mcl-1 expression at the posttranslational level as no obvious change is observed on mRNA level and proteasome inhibitor MG132 almost blocks the Mcl-1 suppression by clitocine. In fact, more ubiquitinated Mcl-1 was detected under clitocine treatment. Our findings indicate that clitocine is potentially an effective adjuvant agent in TRAIL-based cancer therapy.
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Apoptose/efeitos dos fármacos , Neoplasias do Colo/tratamento farmacológico , Neoplasias do Colo/metabolismo , Proteína de Sequência 1 de Leucemia de Células Mieloides/metabolismo , Nucleosídeos de Pirimidina/administração & dosagem , Ligante Indutor de Apoptose Relacionado a TNF/metabolismo , Animais , Antineoplásicos , Linhagem Celular Tumoral , Neoplasias do Colo/genética , Neoplasias do Colo/fisiopatologia , Humanos , Camundongos Nus , Proteína de Sequência 1 de Leucemia de Células Mieloides/genética , Proteólise/efeitos dos fármacos , Proteínas Proto-Oncogênicas c-bcl-2/genética , Proteínas Proto-Oncogênicas c-bcl-2/metabolismoRESUMO
The detection of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) nucleic acid detection provides a direct basis for diagnosing Coronavirus Disease 2019. However, nucleic acid test false-negative results are common in practice and may lead to missed diagnosis. Certain biomarkers, clinical symptoms, and imaging examinations are related to SARS-CoV-2 nucleic acid detection and potential predictors. We examined nucleic acid test results, biomarkers, clinical symptoms, and imaging examination data for 116 confirmed cases and asymptomatic infections in Zhuhai, China. Patients were divided into nucleic acid-positive and -false-negative groups. Predictive values of biomarkers, symptoms, and imaging for the nucleic acid-positive rate were calculated by Least Absolute Shrinkage and Selection Operators regression analysis and binary logistic regression analysis, and areas under the curve of these indicators were calculated. Hemoglobin (ORâ =â 1.018, 95% CI: 1.006-1.030; Pâ =â .004) was higher in the respiratory tract-positive group than the nucleic acid-negative group, but platelets (ORâ =â 0.996, 95% CI: 0.993-0.999; Pâ =â .021) and eosinophils (ORâ =â 0.013, 95% CI: 0.001-0.253; Pâ =â .004) were lower; areas under the curve were 0.563, 0.614, and 0.642, respectively. Some biomarkers can predict SARS-CoV-2 viral nucleic acid detection rates in Coronavirus Disease 2019 and are potential auxiliary diagnostic tests.
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Biomarcadores , Teste de Ácido Nucleico para COVID-19 , COVID-19 , SARS-CoV-2 , Humanos , COVID-19/diagnóstico , Masculino , Feminino , Pessoa de Meia-Idade , Biomarcadores/sangue , Adulto , Teste de Ácido Nucleico para COVID-19/métodos , China , Modelos Logísticos , Idoso , Valor Preditivo dos TestesRESUMO
ABSTRACT: Glucagon-like peptide 1 (GLP-1) analogs are used to treat type 2 diabetes, and they can regulate insulin secretion, energy homeostasis, inflammation, and immune cell function. This study sought to determine whether the GLP-1 analog liraglutide exerts a beneficial action in an acute lung injury model of pneumonia-induced sepsis. Methods: Wild-type FVB/NJ mice (n = 114) were infected by intratracheal injection with Pseudomonas aeruginosa Xen5 (4 × 10 4 CFU/mouse) or an equal volume (50 µL) of saline (control) with or without a subcutaneous injection of liraglutide (2 mg/kg, 30 min after infection). Mice were killed 24 h after infection. Lung tissues and BALF were analyzed. In separate experiments, the dynamic growth of bacteria and animal mortality was monitored using in vivo imaging system within 48 h after infection. In addition, primary lung alveolar type II cells isolated from mice were used to study the mechanism of liraglutide action. Result: Liraglutide improved survival ( P < 0.05), decreased bacterial loads in vivo , and reduced lung injury scores ( P < 0.01) in septic mice. Liraglutide-treated mice showed decreased levels of inflammatory cells ( P < 0.01) and proinflammatory cytokines (TNF-α and IL-6) ( P < 0.01) in the lung compared with septic controls. Liraglutide significantly increased pulmonary surfactant proteins (SP-A and SP-B) expression/secretion ( P < 0.01) and phospholipid secretion ( P < 0.01) in vivo . Primary alveolar type II cells pretreated with liraglutide improved SP-A and SP-B expression after LPS exposure ( P < 0.01). Conclusion: Liraglutide attenuates mortality and lung inflammation/injury in pneumonia-induced sepsis. The increased surfactant expression/secretion and anti-inflammatory effects of liraglutide represent potential mechanisms by GLP-1 agonists potentiate host defense and maintain alveolar respiratory function in acute lung injury.
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Lesão Pulmonar Aguda , Diabetes Mellitus Tipo 2 , Pneumonia , Surfactantes Pulmonares , Sepse , Camundongos , Animais , Liraglutida/efeitos adversos , Surfactantes Pulmonares/efeitos adversos , Tensoativos , Lesão Pulmonar Aguda/metabolismo , Peptídeo 1 Semelhante ao Glucagon , Inflamação , Sepse/tratamento farmacológicoRESUMO
Thrombosis and plasma leakage are two of the most frequent dysfunctions of polypropylene (PP) hollow fiber membrane (PPM) used in extracorporeal membrane oxygenation (ECMO) therapy. In this study, a superhydrophilic endothelial membrane mimetic coating (SEMMC) was constructed on polydopamine-polyethyleneimine pre-coated surfaces of the PPM oxygenator and its ECMO circuit to explore safer and more sustainable ECMO strategy. The SEMMC is fabricated by multi-point anchoring of a phosphorylcholine and carboxyl side chained copolymer (PMPCC) and grafting of heparin (Hep) to form PMPCC-Hep interface, which endows the membrane superior hemocompatibility and anticoagulation performances. Furthermore, the modified PPM reduces protein adsorption amount to less than 30 ng/cm2. More significantly, the PMPCC-Hep coated ECMO system extends the anti-leakage and non-clotting oxygenation period to more than 15 h in anticoagulant-free animal extracorporeal circulation, much better than the bare and conventional Hep coated ECMO systems with severe clots and plasma leakage in 4 h and 8 h, respectively. This SEMMC strategy of grafting bioactive heparin onto bioinert zwitterionic copolymer interface has great potential in developing safer and longer anticoagulant-free ECMO systems. STATEMENT OF SIGNIFICANCE: A superhydrophilic endothelial membrane mimetic coating was constructed on surfaces of polypropylene hollow fiber membrane (PPM) oxygenator and its ECMO circuit by multi-point anchoring of a phosphorylcholine and carboxyl side chain copolymer (PMPCC) and grafting of heparin (Hep). The strong antifouling nature of the PMPCC-Hep coating resists the adsorption of plasma bio-molecules, resulting in enhanced hemocompatibility and anti-leakage ability. The grafted heparin on the zwitterionic PMPCC interface exhibits superior anticoagulation property. More significantly, the PMPCC-Hep coating achieves an extracorporeal circulation in a pig model for at least 15 h without any systemic anticoagulant. This endothelial membrane mimetic anticoagulation strategy shows great potential for the development of safer and longer anticoagulant-free ECMO systems.
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BACKGROUND: Noroviruses are the most common cause of epidemic gastroenteritis worldwide. Noroviruses are comprised of at least five genogroups (GI-GV) and >35 genotypes. GII.7 is a nonpredominant genotype associated with Norovirus outbreaks. On November 17, 2011, Zhuhai Center for Disease Control monitored an increasing number of gastroenteritis cases at a local college. To determine the causes and control the outbreak effectively, we carried out an epidemiologic investigation. METHODS: Suspected cases were defined as those with one of the following symptoms: nausea, vomiting, abdominal pain, or diarrhea presenting on or after November 15 among the people who lived at the college. Probable cases were defined as cases with vomiting or diarrhea over three times per day on or after November 15. Confirmed cases were suspected or probable cases positive for Norovirus (nucleic acid). We conducted a case-control study to identify risk factors of the outbreak. Norovirus was tested by real-time reverse transcription-polymerase chain reaction, and Norovirus polymerase chain reaction products were further sequenced. RESULTS: In total, 63 cases were identified, which were scattered in all 14 departments of the college. The outbreak lasted for 84 h. Time distribution mode indicated a point-source outbreak. Fifty-one cases and 94 controls were contacted. Seventy-five percent of the cases compared to 19% of the controls were exposed to delicatessens (various salad and meat products) from the "Y" convenience store (odds ratio=12, 95% confidence interval 5.4-28). Laboratory tests showed 14 of the 15 cases and two asymptomatic food handlers were positive for Norovirus nucleic acid. There was 100% similarity between the cases and the food handlers when we compared the nucleotide sequences of Norovirus, which clustered with GII.7 genotype. CONCLUSIONS: Delicatessens from the "Y" convenience store were associated with the GII.7 Norovirus outbreak. We strongly recommend food supervision and quality control in convenience stores to decrease the risk of future Norovirus outbreaks.
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Infecções por Caliciviridae/epidemiologia , Surtos de Doenças , Doenças Transmitidas por Alimentos/epidemiologia , Gastroenterite/epidemiologia , Norovirus/isolamento & purificação , Adolescente , Infecções por Caliciviridae/virologia , Estudos de Casos e Controles , China/epidemiologia , Diarreia , Fezes/virologia , Feminino , Contaminação de Alimentos , Manipulação de Alimentos , Doenças Transmitidas por Alimentos/virologia , Gastroenterite/virologia , Genótipo , Humanos , Masculino , Norovirus/genética , Filogenia , RNA Viral/química , RNA Viral/genética , Universidades , Vômito , Adulto JovemRESUMO
There is an urgent need for potential pharmaceutics for lung cancer treatment due to the increased number of lung cancer deaths and the resistance of cancer cells to present therapeutics. The present work aims to discover the anticancer potential of the natural compound chaetocin as a therapeutic for lung cancer treatment. Results showed the significance of chaetocin-induced cell growth inhibition by the expression of G2 /M phase arrest and reactive oxygen species (ROS) dependent apoptosis in A549 lung cancer cells. Results concluded that chaetocin could produce ROS and nuclear damage against A549 lung cancer cells. Interestingly, chaetocin exhibits a significant level of CD47 that down-regulates the expression of CD47 at mRNA levels. PBMC biocompatibility study revealed that chaetocin is non-toxic to normal cells. Overall, experimental results suggested that chaetocin induces A549 cell apoptosis, by causing ROS and nuclear damage activation pathways. In the future, chaetocin might be an effective bio-safe anticancer agent for lung cancer treatments.
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Antígeno CD47 , Neoplasias Pulmonares , Humanos , Espécies Reativas de Oxigênio/metabolismo , Células A549 , Linhagem Celular Tumoral , Leucócitos Mononucleares/metabolismo , Apoptose , Neoplasias Pulmonares/tratamento farmacológico , Proliferação de Células , Dano ao DNARESUMO
ABSTRACT: Traumatic brain injury is one of the main causes of death and disability worldwide, and results in multisystem complications. However, the mechanism of mild traumatic brain injury (MTBI) on lung injury remains unclear. In this study, we used a murine model of MTBI and pneumonia ( Pseudomonas aeruginosa ;) to explore the relationship between these conditions and the underlying mechanism. Methods: Mice (n = 104) were divided into control, MTBI, pneumonia, and MTBI + pneumonia groups. MTBI was induced by the weight-drop method. Pneumonia was induced by intratracheal injection with P. aeruginosa Xen5 strain. Animals were killed 24 h after bacterial challenging. Histological, cellular, and molecular indices of brain and lung injury were assessed using various methods. Results: Mice in both the MTBI and pneumonia groups had more Fluoro-Jade C-positive neurons than did the controls ( P < 0.01), but mice in the MTBI + pneumonia group had fewer Fluoro-Jade C-positive cells than did the pneumonia group ( P < 0.01). The MTBI + pneumonia mice showed decreased bacterial load ( P < 0.05), reduced lung injury score and pulmonary permeability ( P < 0.01), less inflammatory cells, and lower levels of proinflammatory cytokines (TNF-α and IL-1ß; P < 0.01) when compared with the pneumonia group. Molecular analysis indicated lower levels of phosphorylated nuclear factor-κB in the lung of MTBI + pneumonia mice compared with the pneumonia group ( P < 0.01). Furthermore, alveolar macrophages from MTBI mice exhibited enhanced bactericidal capacity compared with those from controls ( P < 0.01). Moreover, MTBI + pneumonia mice exhibited less CD86-positive M1 macrophages compared with the pneumonia group ( P < 0.01). Conclusions: MTBI attenuates pneumonia-induced acute lung injury through the modulation of alveolar macrophage bactericidal capacity and M1 polarization in bacterial pneumonia model.
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Lesão Pulmonar Aguda , Concussão Encefálica , Pneumonia Bacteriana , Animais , Camundongos , Lesão Pulmonar Aguda/induzido quimicamente , Concussão Encefálica/patologia , Lipopolissacarídeos , Pulmão/patologia , Macrófagos Alveolares/patologia , NF-kappa B , Pneumonia Bacteriana/patologiaRESUMO
OBJECTIVE: At present, there are some no-notice drill mode evaluation systems for public health emergencies in Chinese hospitals, which are the subjects of assessment in this study. However, there is a lack of CDC. This study builds a set of no-notice drill mode evaluation systems for public health emergencies that involve the CDC. METHODS: The indexes for these systems were based on the performance of two no-notice drills for public health emergencies in Guangdong Province. Twenty experts were invited to screen the indicators during two rounds of the Delphi method to determine the weight of first- and second-level indexes through the analytic hierarchy process, and the weight of the third-level index was calculated using the percentage method. RESULTS: After two rounds of expert consultation, we obtained four first-level indicators, twenty-six second-level indicators and eighty-six third-level indicators. According to the weight calculated by analytic hierarchy process, the weights of the first-level indicators are emergency preparation (0.2775), verification and consultation regarding an epidemic situation (0.165), field investigation and control (0.3925) and summary report (0.165). Sensitivity analysis shows that the stability of the index is good. CONCLUSION: The no-notice drill mode evaluation system for public health emergencies constructed in this study can be applied to public health departments such as the CDC. Through promotion, it can provide a scientific basis for epidemiological investigation assessment.
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Emergências , Saúde Pública , Técnica Delphi , Hospitais , Humanos , Inquéritos e QuestionáriosRESUMO
Much work has been done recently to make neural networks more interpretable, and one approach is to arrange for the network to use only a subset of the available features. In linear models, Lasso (or â 1-regularized) regression assigns zero weights to the most irrelevant or redundant features, and is widely used in data science. However the Lasso only applies to linear models. Here we introduce LassoNet, a neural network framework with global feature selection. Our approach achieves feature sparsity by allowing a feature to participate in a hidden unit only if its linear representative is active. Unlike other approaches to feature selection for neural nets, our method uses a modified objective function with constraints, and so integrates feature selection with the parameter learning directly. As a result, it delivers an entire regularization path of solutions with a range of feature sparsity. In experiments with real and simulated data, LassoNet significantly outperforms state-of-the-art methods for feature selection and regression. The LassoNet method uses projected proximal gradient descent, and generalizes directly to deep networks. It can be implemented by adding just a few lines of code to a standard neural network.
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Q fever is a worldwide zoonosis caused by Coxiella burnetii (Cb). From January 2018 to November 2019, plasma samples from 2,382 patients with acute fever of unknown cause at a hospital in Zhuhai city of China were tested using metagenomic next-generation sequencing (mNGS). Of those tested, 138 patients (5.8%) were diagnosed with Q fever based on the presence of Cb genomic DNA detected by mNGS. Among these, 78 cases (56.5%) presented from Nov 2018 to Mar 2019, suggesting an outbreak of Q fever. 55 cases with detailed clinical information that occurred during the outbreak period were used for further analysis. The vast majority of plasma samples from those Cb-mNGS-positive patients were positive in a Cb-specific quantitative polymerase chain reaction (n = 38) and/or indirect immunofluorescence assay (n = 26). Mobile phone tracing data was used to define the area of infection during the outbreak. This suggested the probable infection source was Cb-infected goats and cattle at the only official authorized slaughterhouse in Zhuhai city. Phylogenic analysis based on genomic sequences indicated Cb strains identified in the patients, goat and cattle were formed a single branch, most closely related to the genomic group of Cb dominated by strains isolated from goats. Our study demonstrates Q fever was epidemic in 2018-2019 in Zhuhai city, and this is the first confirmed epidemic of Q fever in a contemporary city in China.
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Coxiella burnetii/isolamento & purificação , Febre Q/microbiologia , Adulto , Animais , Bovinos , Doenças dos Bovinos/epidemiologia , Doenças dos Bovinos/microbiologia , Doenças dos Bovinos/transmissão , China/epidemiologia , Coxiella burnetii/classificação , Coxiella burnetii/genética , Surtos de Doenças , Feminino , Doenças das Cabras/epidemiologia , Doenças das Cabras/microbiologia , Doenças das Cabras/transmissão , Cabras , Sequenciamento de Nucleotídeos em Larga Escala , Humanos , Masculino , Metagenômica , Pessoa de Meia-Idade , Filogenia , Febre Q/diagnóstico , Febre Q/epidemiologia , Febre Q/transmissão , Adulto Jovem , Zoonoses/diagnóstico , Zoonoses/epidemiologia , Zoonoses/microbiologia , Zoonoses/transmissãoRESUMO
From June to July 2007, 36 cases of Guillain-Barre syndrome (GBS) occurred in a township in north China. Serological study and bacteria culture were performed to investigate the association between preceding Campylobacter jejuni infection and this GBS outbreak. Anti-C. jejuni antibodies were found in significantly higher numbers of GBS patients (IgM 84%, IgG 87.5%) than in healthy inspection cases (IgM 33%, IgG 27%). IgG anti-GM1 was the dominant anti-ganglioside antibody among the GBS patients. Seven C. jejuni isolates (four from human stool and three from poultry specimens taken from the patients' houses) were obtained. Serotyping and molecular analysis were used to investigate the genetic relatedness among these C. jejuni isolates. The four human isolates, collected from residents of the same district, were indistinguishable by both pulsed-field gel electrophoresis and multilocus sequence typing, suggesting these patients had a common source of infection. A new sequence type, sequence type-2993, was assigned to the human C. jejuni isolates, three of which belonged to Penner serotype heat-stable (HS):41. Both serotype and molecular subtype of the human C. jejuni isolates were different from those of isolates obtained from poultry specimens. Our results suggest that the antecedent C. jejuni infection triggered this GBS outbreak in China.
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Infecções por Campylobacter/complicações , Campylobacter jejuni/classificação , Campylobacter jejuni/isolamento & purificação , Surtos de Doenças , Síndrome de Guillain-Barré/complicações , Síndrome de Guillain-Barré/epidemiologia , Adulto , Animais , Antibacterianos/farmacologia , Anticorpos Antibacterianos/sangue , Anticorpos Antibacterianos/imunologia , Infecções por Campylobacter/genética , Infecções por Campylobacter/imunologia , Infecções por Campylobacter/microbiologia , Campylobacter jejuni/efeitos dos fármacos , Campylobacter jejuni/imunologia , Galinhas/microbiologia , China/epidemiologia , Fezes/microbiologia , Feminino , Microbiologia de Alimentos , Gangliosídeo G(M1)/imunologia , Síndrome de Guillain-Barré/sangue , Síndrome de Guillain-Barré/classificação , Humanos , Imunoglobulina G/sangue , Imunoglobulina G/imunologia , Masculino , Carne/microbiologia , Testes de Sensibilidade Microbiana , Estudos Retrospectivos , Sorotipagem , Adulto JovemRESUMO
INTRODUCTION: Achilles tendon rupture is common, but bilateral ruptures are very rare. Treatment of chronic Achilles tendon rupture is very challenging due tendon retraction and atrophied. We report a case of bilateral asynchronous Achilles tendon rupture patient who was treated with modified minimally invasive whole flexor hallucis longus (FHL) tendon transfer to repair the defects. PATIENT CONCERNS: A 52-year-old male farmer presented to our hospital complaining of bilateral heel pain that had disrupted his walking for 6 months. The patient had been misdiagnosed and under-treated for 1 year. Physical examination showed that his plantar flexors were tender and weak, with marked hypotrophy of the calf muscles. Bilateral ankle radiographs of both X-ray and computed topography (CT) revealed no bone injure. DIAGNOSIS: Magnetic resonance imaging (MRI) indicated a bilateral Achilles tendon rupture. The diagnosis was further confirmed by postoperative histological examination, which revealed Achilles tendonitis accompanied by regional calcification and chondrometaplasia. INTERVENTIONS: Surgical reconstruction of the ruptured Achilles tendons was done through a modified minimally invasive whole FHL tendon transfer followed by physiotherapy. OUTCOMES: The patient was immobilized in a cast for the next 6 weeks, gradual weight bearing gradually was then encouraged for another 6 weeks, and full weight-bearing started 3 months after surgery. By 6-month postoperation, the patient could walk and jog normally returned to his pre-injury working condition. CONCLUSION: Surgical intervention is among the primary treatment of chronic Achilles tendon rupture. However, one of the challenges in its treatment is providing suitable graft for tendon reconstruction. Our case presents a successful reconstruction procedure using less-invasive whole FHL transfer technique. This surgical technique provides satisfactory clinical and functional outcome and can be considered for future therapy.
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Tendão do Calcâneo/cirurgia , Traumatismos dos Tendões/cirurgia , Transferência Tendinosa , Tendão do Calcâneo/diagnóstico por imagem , Tendão do Calcâneo/lesões , Doença Crônica , Humanos , Masculino , Pessoa de Meia-Idade , Traumatismos dos Tendões/diagnóstico por imagemRESUMO
Surfactant protein B (SP-B) is essential for life and plays critical roles in host defense and lowering alveolar surface tension. A single-nucleotide polymorphism (SNP rs1130866) of human SP-B (hSP-B) alters the N-linked glycosylation, thus presumably affecting SP-B function. This study has investigated the regulatory roles of hSP-B genetic variants on lung injury in pneumonia-induced sepsis. METHODS: Wild-type (WT) FVB/NJ and humanized transgenic SP-B-T and SP-B-C mice (expressing either hSP-B C or T allele without mouse SP-B gene) were infected intratracheally with 50âµL (4â×â10âcolony-forming units [CFUs]/mouse) Pseudomonas aeruginosa Xen5 or saline, and then killed 24 or 48 h after infection. Bacterial dynamic growths were monitored from 0 to 48 h postinfection by in vivo imaging. Histopathological, cellular, and molecular changes of lung tissues and bronchoalveolar lavage fluid (BALF) were analyzed. Surface tension of surfactants was determined with constrained drop surfactometry. RESULTS: SP-B-C mice showed higher bioluminescence and CFUs, increased inflammation and mortality, the higher score of lung injury, and reduced numbers of lamellar bodies in type II cells compared with SP-B-T or WT (Pâ<â0.05). Minimum surface tension increased dramatically in infected mice (Pâ<â0.01) with the order of SP-B-C > SP-B-T > WT. Levels of multiple cytokines in the lung of infected SP-B-C were higher than those of SP-B-T and WT (Pâ<â0.01). Furthermore, compared with SP-B-T or WT, SP-B-C exhibited lower SP-B, higher NF-κB and NLRP3 inflammasome activation, and higher activated caspase-3. CONCLUSIONS: hSP-B variants differentially regulate susceptibility through modulating the surface activity of surfactant, cell death, and inflammatory signaling in sepsis.
Assuntos
Pneumonia/metabolismo , Pneumonia/microbiologia , Pseudomonas aeruginosa/patogenicidade , Proteína B Associada a Surfactante Pulmonar/genética , Sepse/metabolismo , Sepse/microbiologia , Animais , Ensaio de Imunoadsorção Enzimática , Predisposição Genética para Doença/genética , Humanos , Marcação In Situ das Extremidades Cortadas , Inflamação/metabolismo , Inflamação/microbiologia , Camundongos , Microscopia Eletrônica de TransmissãoRESUMO
Rheumatoid arthritis (RA) is a common autoimmune disease characterized by joint synovial inflammation and is a challenge for researchers and clinicians. MicroRNAs (miRNAs/miRs) represent a group of small non-coding RNA molecules that post-transcriptionally regulate mRNA expression and are involved in various diseases, including cancer, autoimmune and metabolic diseases, as well as neurological disorders. In the present study, various experiments were performed to investigate the effects and underlying mechanism of miR-155 in RA using rat synoviocytes induced by lipopolysaccharide (LPS) to model rheumatoid arthritis. It was revealed that synovial fibroblasts exhibited significantly higher miR-155 mRNA levels than the control group. Compared with the RA group, the viability of synovial fibroblasts was significantly decreased in the miR-155 mimics + RA group, but markedly increased in the miR-155 inhibitor + RA group. Compared with that in the RA + NC mimic or RA + NC inhibitor groups, the apoptosis of synovial fibroblasts increased significantly in the miR-155 mimics + RA group, but was significantly decreased in the miR-155 inhibitor + RA group. The miR-155 mimics + RA group exhibited higher expression levels of ß-catenin, matrix metalloproteinase 7 and cyclin D1 compared with the miR-155 inhibitor + RA group, and the glycogen synthase kinase protein levels was lower compared with the miR-155 inhibitor + RA group. In brief, it was inferred that the Wnt signaling pathway is involved in the miR-155-associated inhibition of RA synovial fibroblast viability and induction of cell apoptosis. Inhibition of miR-155 may be an effective treatment for RA through regulation of the Wnt signaling pathway to reduce cell apoptosis and enhance cell viability.
RESUMO
Human menstrual blood-derived stem cells (hMBSCs) are a novel type of mesenchymal stem cells (MSCs) that have a high proliferative rate, multilineage differentiation potential, low immunogenicity, and low oncogenicity, making them suitable candidates for regenerative medicine. The therapeutic efficacy of hMBSCs has been demonstrated in some diseases; however, their effects on cervical cancer remain unclear. In the present study, we investigated whether hMBSCs have anticancer properties on cervical cancer cells in vivo and in vitro, which has not yet been reported. In vitro, transwell coculturing experiments revealed that hMBSCs suppress the proliferation and invasion of HeLa cervical cancer cells by inducing G0/G1 cell cycle arrest. In vivo, we established a xenografted BALB/c nude mouse model by subcutaneously coinjecting HeLa cells with hMBSCs for 21 days. We found that hMBSCs significantly decrease the average volume and average weight of xenografted tumors. ELISA, TGF-ß1 antibody, and recombinant human TGF-ß1 (rhTGF-ß1) were used to analyze whether TGF-ß1 contributed to cell cycle arrest. We found that hMBSC-secreted TGF-ß1 and rhTGF-ß1 induced cell cycle arrest and increased the expression of phospho-JNK and phospho-P21 in HeLa cells, which was mostly reversed by TGF-ß1 antibody. These results indicate that hMBSCs have antitumor properties on cervical cancer in vitro and in vivo, mediated by the TGF-ß1/JNK/p21 signaling pathway. In conclusion, this study suggests that hMBSC-based therapy is promising for the treatment of cervical cancer.