Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 81
Filtrar
1.
Front Med (Lausanne) ; 11: 1301588, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38435385

RESUMEN

Objectives: To investigate the characteristic cytokine profile of the aqueous humor in eyes with congenital cataract and pre-existing posterior capsule dysfunction (PCD). Methods: In this cross-sectional study, the enrolled eyes with congenital cataract and PCD were included in the PCD group, while those with an intact posterior capsule were included in the control group. Demographic data and biometric parameters were recorded. The levels of 17 inflammatory factors in the aqueous humor collected from the enrolled eyes were detected using Luminex xMAP technology, and intergroup differences in the collected data were analyzed. Results: The PCD group comprised 41 eyes from 31 patients with congenital cataract and PCD, whereas the control group comprised 42 eyes from 27 patients with congenital cataract and an intact posterior capsule. Lens thickness was significantly thinner in the PCD group than in the control group. However, the levels of monocyte chemoattractant protein-1 (MCP-1), transforming growth factor-ß2 (TGF-ß2), and vascular endothelial growth factor (VEGF) were significantly higher in the PCD group than in the control group. Multivariate logistic regression confirmed that lens thickness and TGF-ß2 level were independent risk factors for PCD. Conclusion: A thinner lens thickness in eyes with congenital cataract and PCD could serve as a biometric feature of these eyes. The higher levels of MCP-1, TGF-ß2, and VEGF in eyes with PCD indicated a change in their intraocular inflammatory microenvironment, which possibly led to cataract progression. Lens thickness and TGF-ß2 level are independent risk factors for PCD.

2.
Artículo en Inglés | MEDLINE | ID: mdl-37874671

RESUMEN

Metal-organic frameworks (MOFs)-derived nanocomposite has attracted extensive attention due to its tunable nanoscale cavities and high chemical tailorability. Herein, with the aim of developing a sensitive electrochemical sensor for p-nitrophenol, a novel MOFs-derived nanocomposite was prepared by the solvothermal method using Zr-MOFs, thiourea, and sodium molybdate as raw materials. By controlling the growth mode and reaction time, the nanohybrids displayed a superstructure composed of MOFs-derived carbon (MOFs-C) and MoS2. Scanning electron microscopy images indicated that MOFs-C/MoS2 was a flower-like porous sphere. Transmission electron microscopic images showed that the MOFs-C/MoS2 had a unique arrow target-like structure. The porous structure held great promise for the fast mass transfer into the material, while the layer-by-layer distributed carbon and MoS2 provided a great structure for the synergistic catalysis. The electrochemical oxidation of (hydroxyamino)phenol to nitrosophenol, which is an important process for the electrochemical behavior of p-nitrophenol, can be selectively catalyzed by the MOFs-C/MoS2. Therefore, the electrochemical sensor based on the MOFs-C/MoS2 material exhibited excellent analytical performance in the determination of p-nitrophenol. Using the technique of square wave voltammetry, the peak current varied quantitatively with the presence of p-nitrophenol in the wide concentration range of 0.5-500 µM. Furthermore, the electrochemical sensor exhibited good practicability in real sample analysis.

3.
Invest Ophthalmol Vis Sci ; 64(13): 43, 2023 10 03.
Artículo en Inglés | MEDLINE | ID: mdl-37883092

RESUMEN

Purpose: This study aimed to establish an image-based classification that can reveal the clinical characteristics of patients with dry eye using unsupervised learning methods. Methods: In this study, we analyzed 82,236 meibography images from 20,559 subjects. Using the SimCLR neural network, the images were categorized. Data for each patient were averaged and subjected to mini-batch k-means clustering, and validated through consensus clustering. Statistical metrics determined optimal category numbers. Using a UNet model, images were segmented to identify meibomian gland (MG) areas. Clinical features were assessed, including tear breakup time (BUT), tear meniscus height (TMH), and gland atrophy. A thorough ocular surface evaluation was conducted on 280 cooperative patients. Results: SimCLR neural network achieved clustering patients with dry eye into six image-based subtypes. Patients in different subtypes harbored significantly different noninvasive BUT, significantly correlated with TMH. Subtypes 1 and 5 had the most severe MG atrophy. Subtype 2 had the highest corneal fluorescent staining (CFS). Subtype 4 had the lowest TMH, whereas subtype 5 had the highest. Subtypes 3 and 6 had the largest MG areas, and the upper MG areas of a person's bilateral eyes were highly correlated. Image-based subtypes are related to meibum quality, CFS, and morphological characteristics of MG. Conclusions: In this study, we developed an unsupervised neural network model to cluster patients with dry eye into image-based subtypes using meibography images. We annotated these subtypes with functional and morphological clinical characteristics.


Asunto(s)
Síndromes de Ojo Seco , Aprendizaje Automático no Supervisado , Humanos , Síndromes de Ojo Seco/diagnóstico por imagen , Síndromes de Ojo Seco/patología , Glándulas Tarsales/patología , Lágrimas , Atrofia/patología
4.
Anal Chim Acta ; 1272: 341522, 2023 Sep 01.
Artículo en Inglés | MEDLINE | ID: mdl-37355338

RESUMEN

The interesting adsorption affinity of two-dimensional nanosheets to single stranded over double stranded nucleic acids have stimulated the exploration of these materials in biosensing. Herein, MoS2 nanosheets decorated anodic aluminum oxide (AAO) membrane was simply prepared by suction filtration. The MoS2/AAO hybrid membrane was initially applied to the electrochemical detection of microRNA using let-7a as the model. When let-7a was incubated with its complementary DNA, double stranded DNA-RNA formed and which displayed weak adsorption capability to the hybrid membrane. And thus the steric effect combining the electrostatic repulsion of the backbone phosphate of nucleic acids for [Fe(CN)6]3- transport across the hybrid membrane varied with the concentration of let-7a. In this way, a label-free electrochemical detection method for microRNA was established by monitoring the change of the redox current of [Fe(CN)6]3-. To further improve the detection sensitivity of the method, we proposed two separate strategies focusing on the amplification of the target-induced steric hindrance with DNA nanostructure and the magnification of the electrode sensitivity for [Fe(CN)6]3- by electrode modification. By using the two strategies, the hybrid membrane based-detection method exhibited broad linear range, low detection limit and good selectivity as well as reproducibility. Therefore, this study provided a proof-of-concept for the application of two-dimensional material to nucleic acids detection.


Asunto(s)
Técnicas Biosensibles , MicroARNs , Óxido de Aluminio/química , Molibdeno/química , Reproducibilidad de los Resultados , Límite de Detección , ADN/química , Electrodos , Técnicas Electroquímicas/métodos , Técnicas Biosensibles/métodos
5.
Biochim Biophys Acta Mol Basis Dis ; 1869(5): 166670, 2023 06.
Artículo en Inglés | MEDLINE | ID: mdl-36822449

RESUMEN

Radiotherapy is an essential treatment modality for the management of non-small cell lung cancer (NSCLC) patients. Tumor radioresistance is the major factor limiting the efficacy of radiotherapy in NSCLC patients. Our study aimed to reveal whether cancer-associated fibroblasts (CAFs), one main component of the tumor microenvironment, regulated DNA damage response of NSCLC cells following irradiation and clarify the involved mechanisms. We found CAFs inhibited irradiation-induced DNA damage while promoted DNA repair of NSCLC cells and caused cell cycle arrest in the radioresistant S phase. CAFs have the ability of up-regulating and stabilizing c-Myc, leading to the transcription activation of HK2 kinase, a key rate-limiting enzyme in glycolysis by activating Wnt/ß-catenin pathway. Attenuation of glycolysis significantly reversed the effect of CAFs on DNA damage response of NSCLC cells. By high-throughput screening of human cytokines/chemokines array, we found CAFs-secreted midkine led to the promotion of glycolysis by activating Wnt/ß-catenin pathway in NSCLC cells. In vivo, CAFs caused the radioresistance of NSCLC cells also by promoting the glycolysis in a ß-catenin signaling-dependent manner. These findings may provide novel strategies for reversing the radioresistance of NSCLC cells.


Asunto(s)
Fibroblastos Asociados al Cáncer , Carcinoma de Pulmón de Células no Pequeñas , Neoplasias Pulmonares , Humanos , Carcinoma de Pulmón de Células no Pequeñas/genética , Carcinoma de Pulmón de Células no Pequeñas/radioterapia , Carcinoma de Pulmón de Células no Pequeñas/metabolismo , Fibroblastos Asociados al Cáncer/patología , beta Catenina/genética , beta Catenina/metabolismo , Neoplasias Pulmonares/genética , Neoplasias Pulmonares/radioterapia , Neoplasias Pulmonares/metabolismo , Reparación del ADN , Vía de Señalización Wnt/genética , Daño del ADN , Glucólisis , Microambiente Tumoral
6.
Mikrochim Acta ; 190(2): 53, 2023 01 14.
Artículo en Inglés | MEDLINE | ID: mdl-36640214

RESUMEN

A nanochannel-based electrochemical immunoassay was developed for the detection of human epidermal growth factor receptor 2 (HER2), with molybdate as the reporter to explore the interaction occurring into the nanochannels. The presence of target increased steric hindrance of the antibody-functionalized nanochannels, thereby hindering the transport of molybdate. And the reporter could be monitored by working electrode modified with hydroxyapatite nanoparticles, based on the formation of the redox-active molybdophosphate. As a result, peak current obtained at ca. - 0.28 V in square wave voltammograms could be applied to quantitative determination of HER2. The electrochemical signal increased linearly with the logarithm of the concentration of HER2 in a broad dynamic range of 0.1 pg∙mL-1 to 10 ng∙mL-1 with a detection limit of 0.05 pg∙mL-1. The reliability of this immunoassay was validated by a recovery range of 99.5% to 111.7% for the detection of three different levels of HER2 in human serum samples. Integrating with multiple bionanochannels, this immunoassay is expected to provide a versatile approach for quantitative detection of various biomarkers in related disease diagnosis and therapy.


Asunto(s)
Biomimética , Molibdeno , Humanos , Reproducibilidad de los Resultados , Inmunoensayo
7.
Anal Chim Acta ; 1239: 340690, 2023 Jan 25.
Artículo en Inglés | MEDLINE | ID: mdl-36628709

RESUMEN

Sensitive and accurate detection of tumor suppressor genes is vastly important to the related therapeutic research. Herein, a ratiometric electrochemical method for let-7a detection was established by integrating a ferrocene (Fc) doped MoS2 nanoplates modified electrode into the nanochannels-based biosensing platform. The ratiometric signal was developed by the redox current of methylene blue (MB) which reflects the target recognition occurred into the nanochannels and the redox current of Fc which corrects the slight signal deviation caused by some analyte-independent factors. And thus, the ratio of peak current of MB and Fc (IMB/IFc) measured at differential pulse voltammogram varied precisely with the increment of the concentration of let-7a incubated in the bioinspired nanochannels. The strategy of spherical DNAzyme induced deposition in nanochannels was utilized to further amplify the signal. Under optimal conditions, a wide linear dynamic range of 50 aM to 10 pM spanning five orders of magnitude was obtained. The developed electrochemical method, with attomole level of detection limit, was successfully applied to the determination of let-7a in human serum and tumor cells. The study not only offers a new route for reliable nucleic acid detection, but also provides an excellent opportunity to extend the application of the two-dimensional transition-metal dichalcogenides.


Asunto(s)
Técnicas Biosensibles , Molibdeno , Humanos , Metalocenos , Oro , Técnicas Biosensibles/métodos , Límite de Detección , Técnicas Electroquímicas/métodos , Azul de Metileno
8.
J Control Release ; 355: 54-67, 2023 03.
Artículo en Inglés | MEDLINE | ID: mdl-36693527

RESUMEN

Liver fibrosis is one of the most common liver diseases with substantial morbidity and mortality. However, effective therapy for liver fibrosis is still lacking. Considering the key fibrogenic role of activated hepatic stellate cells (aHSCs), here we reported a strategy to deplete aHSCs by inducing apoptosis as well as quiescence. Therefore, we engineered biomimetic all-trans retinoic acid (ATRA) loaded PLGA nanoparticles (NPs). HSC (LX2 cells) membranes, presenting the tumor necrosis factor-related apoptosis-inducing ligand (TRAIL), were coated on the surface of the nanoparticles, while the clinically approved agent ATRA with anti-fibrosis ability was encapsulated in the inner core. The biomimetic coating of TRAIL-expressing HSC membranes does not only provide homologous targeting to HSCs, but also effectively triggers apoptosis of aHSCs. ATRA could induce quiescence of activated fibroblasts. While TM-NPs (i.e. membrane coated NPs without ATRA) and ATRA/NPs (i.e. non-coated NPs loaded with ATRA) only showed the ability to induce apoptosis and decrease the α-SMA expression in aHSCs, respectively, TM-ATRA/NPs induced both apoptosis and quiescence in aHSCs, ultimately leading to improved fibrosis amelioration in both carbon tetrachloride-induced and methionine and choline deficient L-amino acid diet induced liver fibrosis mouse models. We conclude that biomimetic TM-ATRA/NPs may provide a novel strategy for effective antifibrosis therapy.


Asunto(s)
Células Estrelladas Hepáticas , Nanopartículas , Ratones , Animales , Células Estrelladas Hepáticas/metabolismo , Biomimética , Cirrosis Hepática/metabolismo , Modelos Animales de Enfermedad , Tretinoina/farmacología , Nanopartículas/química , Apoptosis , Hígado/metabolismo
9.
Front Public Health ; 10: 956463, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-36530683

RESUMEN

Objective: The aim of this study was to analyze the epidemiological characteristics of the causes of chronic kidney disease (CKD) stage 5 patients in North China and to investigate the economic burden of those on hemodialysis (HD) or peritoneal dialysis (PD), as well as the associated influencing factors. Methods: General clinical information, etiological categories, and hospitalization costs for HD or PD were collected from 1,515 patients hospitalized with stage 5 CKD at the Affiliated Hospital of Hebei University from 2016 to 2018. Logistic regression analysis was used to analyze the independent influencing factors affecting patients' financial burden. Results: The highest rate of DN was found in patients aged 70 years or older (27.0%) and the highest incidence of primary glomerulopathy was found in patients aged <50 years (24.3%). Age, type of dialysis, and type of health insurance were independent influences on the total financial burden of patients, and the results of multifactorial logistic regression analysis showed that age [OR (95% CI): 1.009 (1.002, 1.020)] and type of dialysis [OR (95% CI): 1.746 (1.149, 2.659)] would increase the total financial burden. The type of health insurance would reduce the total financial burden [OR (95% CI): 0.222 (0.108, 0.418)]. Conclusion: Chronic kidney disease, with its complex etiology and the heavy financial burden required for treatment, remains a more serious public health problem globally, and it is therefore necessary to further improve medical coverage for dialysis patients, increase management efforts, broaden pro-poor policies and increase the accessibility of medical services in low- and middle-income areas.


Asunto(s)
Fallo Renal Crónico , Insuficiencia Renal Crónica , Humanos , Pacientes Internos , Fallo Renal Crónico/epidemiología , Fallo Renal Crónico/terapia , Diálisis Renal/métodos , Insuficiencia Renal Crónica/epidemiología , Insuficiencia Renal Crónica/terapia , China/epidemiología
10.
Nanomaterials (Basel) ; 12(15)2022 Aug 04.
Artículo en Inglés | MEDLINE | ID: mdl-35957107

RESUMEN

0.9KNbO3-0.1BaTiO3 ceramics, with a bimodal grain size distribution and typical tetragonal perovskite structure at room temperature, were prepared by using an induced abnormal grain growth (IAGG) method at a relatively low sintering temperature. In this bimodal grain size distribution structure, the extra-large grains (~10-50 µm) were evolved from the micron-sized filler powders, and the fine grains (~0.05-0.35 µm) were derived from the sol precursor matrix. The 0.9KNbO3-0.1BaTiO3 ceramics exhibit relaxor-like behavior with a diffused phase transition near room temperature, as confirmed by the presence of the polar nanodomain regions revealed through high resolution transmission electron microscope analyses. A large room-temperature electrocaloric effect (ECE) was observed, with an adiabatic temperature drop (ΔT) of 1.5 K, an isothermal entropy change (ΔS) of 2.48 J·kg-1·K-1, and high ECE strengths of |ΔT/ΔE| = 1.50 × 10-6 K·m·V-1 and ΔS/ΔE = 2.48 × 10-6 J·m·kg-1·K-1·V-1 (directly measured at E = 1.0 MV·m-1). These greatly enhanced ECEs demonstrate that our simple IAGG method is highly appreciated for synthesizing high-performance electrocaloric materials for efficient cooling devices.

11.
Cancer Lett ; 546: 215860, 2022 10 10.
Artículo en Inglés | MEDLINE | ID: mdl-35948121

RESUMEN

Esophageal squamous cell carcinoma (ESCC) is one of the most common human malignancies worldwide and is associated with high morbidity and mortality. More than 70% of ESCC patients are diagnosed at the intermediate or advanced stage. Concurrent chemoradiotherapy is the standard treatment regimen for patients with advanced ESCC. However, ESCC patients show a poor 5-year survival rate of around 20%. Cancer-associated fibroblasts (CAFs) are a major component of the tumor microenvironment and control tumor initiation and progression. CAFs create a pro-survival and immunosuppressive microenvironment by crosstalk with cancer cells. Moreover, CAFs lead the collective invasion of cancer cells of the epithelial phenotype by remodeling the extracellular matrix. In this review, we highlight the impact of CAFs on ESCC, including induction of chemo- and radio-resistance, migration, invasion, and immune escape. The origin of CAFs and the influence of ESCC cells on CAF activation are also described. Furthermore, we highlight the clinical prospects and future trends of CAFs-targeted therapies in ESCC. A better understanding of the molecular biology of CAFs may contribute to the development of novel anti-ESCC strategies.


Asunto(s)
Fibroblastos Asociados al Cáncer , Carcinoma de Células Escamosas , Neoplasias Esofágicas , Carcinoma de Células Escamosas de Esófago , Línea Celular Tumoral , Fibroblastos , Humanos , Microambiente Tumoral
12.
Gigascience ; 112022 07 12.
Artículo en Inglés | MEDLINE | ID: mdl-35818690

RESUMEN

Open Science has gained momentum over the past decade, and embracing that, GigaScience, from its launch a decade ago has aimed at pushing scientific publishing beyond just making articles open access toward making the entire research process open and available as an embedded part of the publishing process. Before the journal's launch in July 2012, the editors aimed to make publishing more than a narrative presentation of work already done into a fully open process. Major milestones include creating our own data repository, embracing FAIR principles, promoting and integrating preprints, and working with other platforms to contribute to a 21st century publishing infrastructure. Almost 10 years after GigaScience's launch, UNESCO published its Open Science Recommendations. With these in mind, looking back, we are happy to have contributed in various ways to UNESCO's aim to "foster a culture of Open Science and aligning incentives for Open Science" from the very beginning, and, more, to use those recommendations to guide our path into the future: to truly embrace the full spectrum of information, tools, and access to Open Science for all participants in scientific endeavours.

13.
Microbiol Spectr ; 10(4): e0276421, 2022 08 31.
Artículo en Inglés | MEDLINE | ID: mdl-35856709

RESUMEN

One of the challenges associated with the treatment of Pseudomonas aeruginosa infections is the high prevalence of multidrug resistance (MDR). Since conventional antibiotics are ineffective at treating such bacterial infections, innovative antibiotics acting upon novel targets or via mechanisms are urgently required. In this study, we identified a quorum sensing inhibitor (QSI), norharmane, that uniquely shows weak antibacterial activity but strongly inhibits pyocyanin production and biofilm formation of MDR P. aeruginosa. Biophysical experiments and molecular docking studies showed that norharmane competes with anthraniloyl-AMP for anthranilyl-CoA synthetase PqsA of P. aeruginosa at the ligand-binding pocket, which is not exploited by current inhibitors, thereby altering transcription regulatory activity. Moreover, norharmane exhibits synergy with polymyxin B. This synergism exhibits a high killing rate, low probability of resistance selection, and minimal cytotoxicity. Notably, norharmane can effectively boost polymyxin B activity against MDR P. aeruginosa-associated infections in animal models. Together, our findings provide novel insight critical to the design of improved PqsA inhibitors, and an effective combination strategy to overcome multiantibiotic bacterial resistance using conventional antibiotics and QSIs. IMPORTANCE Pseudomonas aeruginosa is a dominant hospital-acquired bacterial pathogen typically found in immunocompromised individuals. It is particularly dangerous for patients with chronic lung diseases and was identified as a serious threat for patients in the 2019 Antimicrobial Resistance Threats report (https://www.cdc.gov/drugresistance/biggest-threats.html). In this study, we used activity-based high-throughput screening to identify norharmane, a potent and selective inhibitor of P. aeruginosa PqsA, which is a well-conserved master quorum sensing (QS) regulator in multidrug resistant (MDR) P. aeruginosa. This compound competitively binds anthranilyl-CoA synthetase PqsA at the anthraniloyl-AMP binding domain, which has not been exploited by known inhibitors. Remarkably, norharmane can significantly block the production of the virulence factor, pyocyanin (87%), and biofilm formation (80%) in MDR P. aeruginosa. Furthermore, norharmane is capable of augmenting polymyxin B activity against MDR P. aeruginosa in cell cultures and animal models. Taken together, these results suggest that norharmane may be an effective adjuvant for combating multiantibiotic bacterial resistance.


Asunto(s)
Infecciones por Pseudomonas , Pseudomonas aeruginosa , Animales , Antibacterianos/farmacología , Proteínas Bacterianas/metabolismo , Biopelículas , Coenzima A/antagonistas & inhibidores , Ligasas/antagonistas & inhibidores , Simulación del Acoplamiento Molecular , Polimixina B/farmacología , Pseudomonas aeruginosa/metabolismo , Infecciones por Pseudomonas/tratamiento farmacológico , Infecciones por Pseudomonas/microbiología , Piocianina/metabolismo , Percepción de Quorum , Factores de Virulencia/metabolismo
15.
Drug Discov Today ; 27(7): 1862-1873, 2022 07.
Artículo en Inglés | MEDLINE | ID: mdl-35390545

RESUMEN

Clostridioides difficile bacteria can cause life-threatening diarrhea and colitis owing to limited treatment options and unacceptably high recurrence rates among infected patients. This necessitates the development of alternative routes for C. difficile treatment. Drug repurposing with new indications represents a proven shortcut. Here, we present a refined focus on 16 FDA-approved drugs that would be suitable for further development as potential anti-C. difficile drugs. Of these drugs, clinical trials have been conducted on five currently used drugs; however, ursodeoxycholic acid is the only drug to enter Phase IV clinical trials to date. Thus, drug repurposing promotes the study of mechanistic and therapeutic strategies, providing new options for the development of next-generation anti-C. difficile agents.


Asunto(s)
Clostridioides difficile , Infecciones por Clostridium , Antibacterianos/uso terapéutico , Clostridioides , Infecciones por Clostridium/tratamiento farmacológico , Infecciones por Clostridium/microbiología , Reposicionamiento de Medicamentos , Humanos
16.
Front Microbiol ; 13: 835058, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-35283837

RESUMEN

Both Gram-positive and Gram-negative bacteria can secrete extracellular vesicles (EVs), which contain numerous active substances. EVs mediate bacterial interactions with their hosts or other microbes. Bacterial EVs play a double-edged role in infections through various mechanisms, including the delivery of virulence factors, modulating immune responses, mediating antibiotic resistance, and inhibiting competitive microbes. The spread of antibiotic resistance continues to represent a difficult clinical challenge. Therefore, the investigation of novel therapeutics is a valuable research endeavor for targeting antibiotic-resistant bacterial infections. As a pathogenic substance of bacteria, bacterial EVs have gained increased attention. Thus, EV inhibitors are expected to function as novel antimicrobial agents. The inhibition of EV production, EV activity, and EV-stimulated inflammation are considered potential pathways. This review primarily introduces compounds that effectively inhibit bacterial EVs and evaluates the prospects of their application.

17.
Biosens Bioelectron ; 201: 113963, 2022 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-35007994

RESUMEN

Controllable transport of ions, molecules or fluids in bioinspired nanochannels is crucial to study biointeraction occurred in confined space and also develop biosensing platforms or devices. Herein, ferrofluids transport in biofunctionalized nanochannels was investigated and a novel electrochemical biosensing platform with the characteristic of label-free, high sensitivity and rapid response was constructed. The hydrophilic ferrofluids can flux swiftly through the antibody-immobilized nanochannels with the assistance of a permanent magnet. It was initially found that the presence of ferrofluids would depress the redox current of the electrochemical probe [Fe(CN)6]3-. The mechanism of the depressing effect was ascribed to the constrained diffusion of [Fe(CN)6]3- which lowered the concentration of it at the electrode surface and the weak adsorption of the ferrofluids which increased the charge transfer resistance of the interface. Therefore, redox current of the probe was applied to indicate the amount of the ferrofluids fluxing through the bioinspired nanochannels. The steric hindrance of the bioinspired nanochannels changed with the amount of the corresponding target being incubated, resulting in quantitative variation of the redox current. In this way, electrochemical biosensing platform based on ferrofluids transport was constructed. Using carbohydrate antigen 153 (CA153) as a model target, a low detection limit of 0.0013 U·mL-1 was acquired. This magnetic-controlled bioelectrochemical platform was expected to be expanded to other applications such as genetic testing, drug analysis, and molecular identification.


Asunto(s)
Técnicas Biosensibles , Técnicas Electroquímicas , Electrodos , Fenómenos Magnéticos
18.
World J Clin Cases ; 9(30): 9050-9058, 2021 Oct 26.
Artículo en Inglés | MEDLINE | ID: mdl-34786387

RESUMEN

BACKGROUND: Since December 2019, there have been many new cases of coronavirus pneumonia in Wuhan, Hubei Province, which has gradually spread throughout the country. AIM: To explore our hospital's innovative management system to ensure the efficient operation of fever clinics during the epidemic, since controlling the spread of disease is an important way to prevent and control the epidemic. METHODS: In total, 200 outpatients with fever at our hospital between November 2019 and July 2020 were selected and allocated into two groups. RESULTS: The fever clinic in our hospital operated smoothly, and infection with the novel coronavirus disease (COVID-19) has not been reported in our hospital. Additionally, we did not have any cases of missed diagnosis. The awareness regarding COVID-19 infection sources, transmission routes, early symptoms, and preventive measures was significantly higher in our fever clinic than in those of the pre-management group. CONCLUSION: "An integrated system, three separate responsibilities" ensured the efficient functioning of our fever outpatient clinic and early screening of COVID-19 cases, which effectively curbed the transmission of COVID-19 and hence prevented COVID-19 pneumonia epidemic in our hospital, ultimately achieving the maximum effect of epidemic prevention and control.

19.
Int J Mol Sci ; 22(19)2021 Sep 25.
Artículo en Inglés | MEDLINE | ID: mdl-34638680

RESUMEN

Medium-chain triglycerides (MCTs) are an emerging choice to treat neurodegenerative disorders such as Alzheimer's disease. They are triesters of glycerol and three medium-chain fatty acids, such as capric (C8) and caprylic (C10) acids. The availability of C8-C10 methyl esters (C8-C10 ME) from vegetable oil processes has presented an opportunity to use methyl esters as raw materials for the synthesis of MCTs. However, there are few reports on enzymes that can efficiently hydrolyse C8-C10 ME to industrial specifications. Here, we report the discovery and identification of a novel lipase from Lasiodiplodia theobromae fungus (LTL1), which hydrolyses C8-C10 ME efficiently. LTL1 can perform hydrolysis over pH ranges from 3.0 to 9.0 and maintain thermotolerance up to 70 °C. It has high selectivity for monoesters over triesters and displays higher activity over commercially available lipases for C8-C10 ME to achieve 96.17% hydrolysis within 31 h. Structural analysis by protein X-ray crystallography revealed LTL1's well-conserved lipase core domain, together with a partially resolved N-terminal subdomain and an inserted loop, which may suggest its hydrolytic preference for monoesters. In conclusion, our results suggest that LTL1 provides a tractable route towards to production of C8-C10 fatty acids from methyl esters for the synthesis of MCTs.


Asunto(s)
Ascomicetos/metabolismo , Ésteres/metabolismo , Lipasa/metabolismo , Secuencia de Aminoácidos , Ácidos Grasos/metabolismo , Glicerol/metabolismo , Hidrólisis , Aceites de Plantas/metabolismo , Triglicéridos/metabolismo
20.
ASN Neuro ; 13: 17590914211016217, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-34053243

RESUMEN

Parkinson's disease (PD) ranks the second place among neurodegenerative diseases in terms of its morbidity, which affects 1-2% people aged over 65 years. In addition to genetics, some environmental factors may exert vital parts in PD occurrence as well. At present, more and more studies are conducted to elucidate the association between gut microbial dysbiosis and the incidence of PD. Gut microbial dysbiosis has a certain effect on both the central nervous system (CNS) and the enteric nervous system (ENS), which indicates that there is a gut-microbiota-brain axis that induces CNS disorders. Some gut microbial strains are suggested to suppress or weaken the neuroinflammation- and gut-inflammation-immune responses, which suggests the protective and pathogenic effects of certain gut microbial species on PD progression. Therefore, gut microbiome may contain plenty of targets for preventing and managing PD. Faecal microbiota transplantation (FMT) may serve as a direct and useful treatment for PD in the future. Nonetheless, there is little available scientific research in this field. The present work reviewed the latest research to examine the association of gut microbiota with PD, and the future prospects of FMT treatment.


Asunto(s)
Disbiosis/terapia , Trasplante de Microbiota Fecal/métodos , Microbioma Gastrointestinal/fisiología , Enfermedad de Parkinson/terapia , Animales , Disbiosis/diagnóstico , Humanos , Enfermedad de Parkinson/diagnóstico , Enfermedad de Parkinson/microbiología
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA
...