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1.
J Cell Sci ; 135(5)2022 03 01.
Artigo em Inglês | MEDLINE | ID: mdl-33414166

RESUMO

Ferroptosis is a regulated, non-apoptotic form of cell death, characterized by hydroxy-peroxidation of discrete phospholipid hydroperoxides, particularly hydroperoxyl (Hp) forms of arachidonoyl- and adrenoyl-phosphatidylethanolamine, with a downstream cascade of oxidative damage to membrane lipids, proteins and DNA, culminating in cell death. We recently showed that human trophoblasts are particularly sensitive to ferroptosis caused by depletion or inhibition of glutathione peroxidase 4 (GPX4) or the lipase PLA2G6. Here, we show that trophoblastic ferroptosis is accompanied by a dramatic change in the trophoblast plasma membrane, with macro-blebbing and vesiculation. Immunofluorescence revealed that ferroptotic cell-derived blebs stained positive for F-actin, but negative for cytoplasmic organelle markers. Transfer of conditioned medium that contained detached macrovesicles or co-culture of wild-type target cells with blebbing cells did not stimulate ferroptosis in target cells. Molecular modeling showed that the presence of Hp-phosphatidylethanolamine in the cell membrane promoted its cell ability to be stretched. Together, our data establish that membrane macro-blebbing is characteristic of trophoblast ferroptosis and can serve as a useful marker of this process. Whether or not these blebs are physiologically functional remains to be established.


Assuntos
Ferroptose , Feminino , Humanos , Peroxidação de Lipídeos , Fosfolipídeo Hidroperóxido Glutationa Peroxidase , Placenta , Gravidez , Trofoblastos
2.
Ann Lab Med ; 42(1): 24-35, 2022 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-34374346

RESUMO

Background: Laboratory parameter abnormalities are commonly observed in COVID-19 patients; however, their clinical significance remains controversial. We assessed the prevalence, characteristics, and clinical impact of laboratory parameters in COVID-19 patients hospitalized in Daegu, Korea. Methods: We investigated the clinical and laboratory parameters of 1,952 COVID-19 patients on admission in nine hospitals in Daegu, Korea. The average patient age was 58.1 years, and 700 (35.9%) patients were men. The patients were classified into mild (N=1,612), moderate (N=294), and severe (N=46) disease groups based on clinical severity scores. We used chi-square test, multiple comparison analysis, and multinomial logistic regression to evaluate the correlation between laboratory parameters and disease severity. Results: Laboratory parameters on admission in the three disease groups were significantly different in terms of hematologic (Hb, Hct, white blood cell count, lymphocyte%, and platelet count), coagulation (prothrombin time and activated partial thromboplastin time), biochemical (albumin, aspartate aminotransferase, alanine aminotransferase, lactate, blood urea nitrogen, creatinine, and electrolytes), inflammatory (C-reactive protein and procalcitonin), cardiac (creatinine kinase MB isoenzyme and troponin I), and molecular virologic (Ct value of SARS-CoV-2 RdRP gene) parameters. Relative lymphopenia, prothrombin time prolongation, and hypoalbuminemia were significant indicators of COVID-19 severity. Patients with both hypoalbuminemia and lymphopenia had a higher risk of severe COVID-19. Conclusions: Laboratory parameter abnormalities on admission are common, are significantly associated with clinical severity, and can serve as independent predictors of COVID-19 severity. Monitoring the laboratory parameters, including albumin and lymphocyte count, is crucial for timely treatment of COVID-19.


Assuntos
COVID-19 , Análise de Dados , Humanos , Laboratórios , Masculino , Pessoa de Meia-Idade , República da Coreia/epidemiologia , Estudos Retrospectivos , SARS-CoV-2
3.
Ann Lab Med ; 42(1): 71-78, 2022 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-34374351

RESUMO

Background: Seroprevalence studies of coronavirus disease 2019 (COVID-19) cases, including asymptomatic and past infections, are important to estimate the scale of the disease outbreak and to establish quarantine measures. We evaluated the clinical performance of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antibody assays available in Korea for use in seroprevalence studies. Methods: The sensitivity, specificity, cross-reactivity, and interference of five SARS-CoV-2 antibody assays were evaluated using the following: 398 serum samples from confirmed COVID-19 patients, 510 negative control samples from before 2018 (pre-pandemic), 163 serum samples from patients with SARS, Middle East respiratory syndrome (MERS), and other viral infections, and five samples for the interference study. Results: The sensitivities of the five assays ranged from 92.2% to 98%, and their specificities, including cross-reactivity and interference, ranged from 97.5% to 100%. The agreement rates were excellent (kappa >0.9). Adjustment of the cutoff values could be considered through ROC curve analysis. The positive predictive values of the individual assays varied from 3.5% to 100% at a 0.1% prevalence but were as high as ≥95% when two assays were combined. Conclusions: The prevalence of COVID-19 in Korea is considered to be exceptionally low at present; thus, we recommend using a combination of two or more SARS-CoV-2 antibody assays rather than a single assay. These results could help select SARS-CoV-2 antibody assays for COVID-19 seroprevalence studies in Korea.


Assuntos
COVID-19 , SARS-CoV-2 , Anticorpos Antivirais , Humanos , Pandemias , Sensibilidade e Especificidade , Estudos Soroepidemiológicos
4.
Ann Lab Med ; 42(1): 96-99, 2022 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-34374354

RESUMO

The sensitivity of molecular diagnostics could be affected by nucleotide variants in pathogen genes, and the sites affected by such variants should be monitored. We report a single-nucleotide variant (SNV) in the nucleocapsid (N) gene of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), i.e., G29179T, which impairs the diagnostic sensitivity of the Xpert Xpress SARS-CoV-2 assay (Cepheid, Sunnyvale, CA, USA). We observed significant differences between the threshold cycle (Ct) values for envelope (E) and N genes and confirmed the SNV as the cause of the differences using Sanger sequencing. This SNV, G29179T, is the most prevalent in Korea and is associated with the B.1.497 virus lineage, which is dominant in Korea. Clinical laboratories should be aware of the various SNVs in the SARS-CoV-2 genome and consider their potential effects on the diagnosis of coronavirus disease 2019.


Assuntos
COVID-19 , SARS-CoV-2 , Humanos , Técnicas de Diagnóstico Molecular , Nasofaringe , Nucleotídeos , Prevalência , República da Coreia , Sensibilidade e Especificidade
5.
Ann Lab Med ; 42(1): 100-104, 2022 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-34374355

RESUMO

Standard tests for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) detect the presence of viral RNA using real-time reverse transcription (rRT)-PCR. Recently, convenient, rapid, and relatively inexpensive SARS-CoV-2 antigen (Ag) detection methods have been developed. The STANDARD Q COVID-19 Ag test (SD Biosensor, Inc., Suwon, Korea) is a rapid immunochromatography test that qualitatively detects the nucleocapsid protein of SARS-CoV-2 using gold conjugated antibodies. We evaluated its performance in comparison with that of Allplex 2019-nCoV Assay (Seegene, Seoul, Korea) in a retrospective case-control study using residual samples. The sensitivity and specificity of the STANDARD Q COVID-19 Ag test were 89.2% (58/65) and 96.0% (96/100), respectively. Cycle threshold (Ct) values for the three target SARS-CoV-2 genes (envelope, RNA-dependent RNA polymerase, and nucleocapsid genes) included in Allplex 2019-nCoV Assay were significantly lower in Ag test-positive patients than in Ag test-negative patients (P<0.001). The Ag test sensitivity was higher in samples with Ct≤30 and those collected one to five days post symptom onset. In conclusion, the STANDARD Q COVID-19 Ag test can serve as an alternative in high-prevalence settings, when the low sensitivity is compensated or when rRT-PCR tests are limited.


Assuntos
COVID-19 , SARS-CoV-2 , Estudos de Casos e Controles , Humanos , Nasofaringe , Estudos Retrospectivos , Sensibilidade e Especificidade
8.
Esc. Anna Nery Rev. Enferm ; 26(spe): e20210208, 2022. ilus
Artigo em Português | LILACS, BDENF - Enfermagem | ID: biblio-1292780

RESUMO

Objetivo: compreender a ausência de rituais fúnebres na pandemia de COVID-19 no processo de viver o luto das famílias brasileiras que perderam entes queridos por COVID-19. Método: pesquisa qualitativa documental realizada em três jornais disponibilizados online. Foram analisadas 67 reportagens, divididas em duas categorias; a primeira trata dos sofrimentos psicológicos derivados do isolamento social, como ansiedade, depressão, solidão e medo; e a segunda trata das diferentes manifestações do luto e o efeito psicológico das perdas em meio à pandemia. Resultado: a ritualização da morte é indissociável do processo de elaboração das perdas. A ausência de rituais fúnebres, aliada ao distanciamento social, repercute de forma desafiadora para a sociedade e para os profissionais da saúde mental. Estratégias não presenciais de demonstração de afeto e elaboração da perda podem amenizar o isolamento imposto pela pandemia. Conclusões e implicações para a prática: o processo de viver humano é repleto de ritos de passagem e a ritualística na morte-morrer se mostra necessária para a vivência da despedida, da certeza do distanciamento ocorrido entre entes e família. Implica em modos resolutivos de registro emocional, mental e mesmo físico da expressão pública de sofrimento do enlutado e do não esquecimento do Ser à morte. Impacta na prática assistencial para o acolhimento, orientação e elaboração das perdas para a manutenção de vida saudável das pessoas enlutadas, o que propõe argumentos teórico-reflexivos no cuidado em saúde mental e na guarida de pessoas enlutadas decorrentes da pandemia


Objective: to understand the absence of funeral rituals in the process of living the grief process of Brazilian families who lost loved ones by COVID-19. Method: this is a qualitative documental research carried out in three newspapers available online. Sixty-seven reports were analyzed, divided into two categories; the first deals with psychological suffering derived from social isolation, such as anxiety, depression, loneliness and fear; and the second deals with the different manifestations of grief and the psychological effect of losses amidst the pandemic. Result: the ritualization of death is inseparable from the process of elaboration of the losses. The absence of funeral rituals combined with social dictatorship can have a challenging impact on society and mental healthcare professionals. Non-presential strategies for showing affection and elaborating the loss can ease the isolation imposed by the pandemic. Conclusions and implications for practice: the human living process is full of rites of passage and death-dying rituals prove to be necessary for the experience of farewell, of the certainty of the distance between loved ones and family. It implies resolving modes of emotional, mental and even physical recording of the public expression of the griever's suffering and not forgetting the Being's to death. It impacts care practice for reception, guidance and elaboration of losses for the maintenance of a healthy life for grievers, which proposes theoretical-reflective arguments in mental healthcare and in the shelter of grievers resulting from the pandemic


Objetivo: comprender la ausencia de rituales funerarios en el proceso de dolor de las familias brasileñas que perdieron a sus seres queridos por COVID-19. Método: una investigación documental cualitativa realizada en tres periódicos disponibles en línea. Se analizaron 67 informes, divididos en dos categorías; el primero trata sobre el sufrimiento psicológico derivado del aislamiento social, como la ansiedad, la depresión, la soledad y el miedo; y el segundo trata de las diferentes manifestaciones del dolor y el efecto psicológico de las pérdidas en medio de la pandemia. Resultado: la ritualización de la muerte es inseparable del proceso de elaboración de las pérdidas. La ausencia de rituales funerarios combinada con la dictadura social puede tener un impacto desafiante en la sociedad y los profesionales de la salud mental. Las estrategias no presenciales para mostrar afecto y explicar la pérdida pueden aliviar el aislamiento impuesto por la pandemia. Conclusiones e implicaciones para la práctica: el proceso del vivir humano está lleno de ritos de paso y los rituales de la muerte-morir resultan necesarios para la experiencia de la despedida, de la certeza de la distancia entre los seres queridos y la familia. Implica resolver modos de registro emocional, mental e incluso físico de la expresión pública del sufrimiento del doliente y del no olvido del Ser hasta la muerte. Incide en la práctica asistencial para la recepción, orientación y elaboración de las pérdidas para el mantenimiento de una vida sana de las personas en dolor, el cual propone argumentos teórico-reflexivos en la atención de la salud mental y en el refugio de personas en dolor producto de la pandemia


Assuntos
Humanos , Luto , Família/psicologia , Morte , Pandemias , Rituais Fúnebres/psicologia , COVID-19 , Pesquisa Qualitativa , Distanciamento Físico
9.
Esc. Anna Nery Rev. Enferm ; 26(spe): e20210179, 2022. ilus
Artigo em Português | LILACS, BDENF - Enfermagem | ID: biblio-1292850

RESUMO

Objetivo: O estudo objetivou compreender as repercussões da pandemia da Covid-19 no cuidado de lactentes prematuros, na perspectiva de mães e profissionais de saúde. Método: Foram realizadas entrevistas semiestruturadas nos meses de junho e julho de 2020, por meio de ligação telefônica, com 14 mães e quatro profissionais de saúde do serviço de follow-up de uma maternidade pública da Paraíba, Brasil. Resultados: A partir da análise temática indutiva, os impactos da pandemia no cuidado ao lactente nascido prematuro, foram: sobrecarga e afastamento dos profissionais dos serviços de saúde, desativação temporária da unidade mãe canguru, descontinuidade da assistência ao prematuro, medo materno de expor a criança à Covid-19 e baixa condição socioeconômica. Foram elencadas estratégias de enfrentamento para o cuidado dos lactentes durante a pandemia, como: maior espaçamento das consultas, acompanhamento por meio telefônico e cumprimento das medidas de biossegurança. Conclusão e implicações para a prática: A pandemia exigi adaptações na assistência, tornando necessárias novas formas de cuidado a essas crianças, como exemplo, as consultas de acompanhamento remotas, a fim de garantir o seu direito à vida e saúde


Objective: The study aimed at understanding the repercussions of the Covid-19 pandemic in the care of premature infants, from the perspective of mothers and health professionals. Method: Semi-structured interviews were conducted in the months of June and July 2020, over the telephone, with 14 mothers and four health professionals from the follow-up service of a public maternity hospital in Paraíba, Brazil. Results: From the inductive thematic analysis, the impacts of the pandemic on the care of premature infants were as follows: overload and distancing of health service professionals, temporary deactivation of the Kangaroo mother unit, discontinuity of care for the premature infant, maternal fear of exposing the child to Covid-19 and low socioeconomic status. Coping strategies for the care of infants during the pandemic were listed, such as: greater spacing between consultations, phone follow-up and compliance with biosafety measures. Conclusion and implications for the practice: The pandemic required adaptations in care, which make new forms of care necessary for these children, such as remote follow-up consultations, in order to guarantee their right to life and health


Objetivo: El estudio tuvo como objetivo comprender las repercusiones de la pandemia de Covid-19 en la atención de bebés prematuros, desde la perspectiva de las madres y los profesionales de la salud. Método: Se realizaron entrevistas semiestructuradas en los meses de junio y julio de 2020, por medio de llamadas telefónicas, a 14 madres y cuatro profesionales de la salud del servicio de seguimiento de una maternidad pública en Paraíba, Brasil. Resultados: A partir del análisis temático inductivo, los efectos de la pandemia en la atención de bebés prematuros fueron los siguientes: sobrecarga y distanciamiento de profesionales de los servicios de salud, inhabilitación temporal de la unidad Madre Canguro, discontinuidad de la atención al bebé prematuro, miedo materno a exponer al niño al Covid-19 y nivel socioeconómico bajo. Se enumeraron estrategias de afrontamiento para la atención infantil durante la pandemia, tales como: mayor intervalo entre consultas, seguimiento telefónico y cumplimiento de medidas de bioseguridad. Conclusión e implicaciones para la práctica: La pandemia requirió adaptaciones en la atención, que hacen necesarias nuevas formas de atención para estos niños, como las consultas de monitoreo remoto, para garantizar su derecho a la vida y a la salud


Assuntos
Humanos , Feminino , Lactente , Adulto , Pessoa de Meia-Idade , Recém-Nascido Prematuro/crescimento & desenvolvimento , Pessoal de Saúde , Serviços de Saúde Materno-Infantil , COVID-19 , Cuidado do Lactente , Mães , Carga de Trabalho/psicologia , Consulta Remota , Pesquisa Qualitativa , Cobertura Vacinal , Medo , Método Canguru , Higiene das Mãos , Distanciamento Físico , COVID-19/prevenção & controle
10.
Talanta ; 236: 122837, 2022 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-34635227

RESUMO

A quartz crystal microbalance (QCM) sensor was developed in this study with the vegetable oil from olive (OLV-QCM) to detect an important volatile organic compound, ß-pinene in Indian cardamom. Hydrophobic vegetable oil from olive, which contains oleic acid and omega-9, a monounsaturated fatty acid was found to be suitable for binding ß-pinene through non-covalent bonds. The fabricated QCM sensor coating was examined with the field emission scanning electron microscope (FESEM) and Fourier-transform infrared spectroscopy (FTIR) to determine its surface morphology and chemical compositions. The sensitivity, reproducibility, repeatability, and reusability were studied for the developed sensor. Notably, the sensor was observed to be highly selective towards ß-pinene as compared to the other volatile components present in cardamom. The limit of detection (LOD) and limit of quantitation (LOQ) parameters were determined as 5.57 mg L-1 and 18.57 mg L-1, respectively. Moreover, the adsorption isotherm models of the sensor were studied to validate the physical adsorption affinity towards ß-pinene applying Langmuir, Freundlich, and Langmuir-Freundlich isotherm models. The sensor showed a correlation factor of 0.99 with the peak area percentage of gas chromatography-mass spectrometry (GC-MS) analysis for ß-pinene in cardamom samples. The sensor was prepared with natural vegetable oil, unlike health hazard chemicals. In addition to this, the low-cost, easy fabrication process ensured the suitability of the sensor for practical deployment.


Assuntos
Elettaria , Impressão Molecular , Monoterpenos Bicíclicos , Óleos Vegetais , Polímeros , Técnicas de Microbalança de Cristal de Quartzo , Reprodutibilidade dos Testes
11.
Talanta ; 236: 122843, 2022 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-34635233

RESUMO

In our study, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF/MS) is proposed as a novel tool, which can be applied to analyze lipids in urine samples. For this reason, the main aim of the study was to develop and optimize the preparation protocol for urine samples in lipidomics, using urine samples obtained from patients with diagnosed cancer and non-cancer controls. Several conditions like extraction method and types of matrices were evaluated. For this purpose, two methods for the extraction of lipids, namely modified Folch and Bligh & Dyer were employed. Furthermore, two types of matrices (α-cyano-4-hydroxycinnamic acid (HCCA) and 2,5-dihydroxybenzoic acid (DHB)) for the separation of lipids into individual components was tested. The results of this study can serve as an essential source for the selection of appropriate extraction methods and the appropriate choice of a matrix for the purification and identification of a particular class of lipid in human biological fluids. Based on it, Bligh & Dyer method associated with the usage of HCCA matrix was found to be the most effective for lipidomics using MALDI-TOF/MS. The optimized method was applied to compare the lipid profile of 139 urine samples collected from both healthy individuals and patients with prostate cancer. The tandem spectroscopic analysis allowed to identify lysophosphatidylcholine, phosphatidylcholine, phosphatidylethanolamine, phosphatidylinositol, and triacylglycerols in urine samples. Finally, MALDI-TOF/MS analysis enabled to discriminate between the two tested groups (healthy individuals and patients with prostate cancer). A preliminary statistical model suggested that classification accuracy ranging from 83.3 to100.0% may be achieved by using pre-selected MS signals.


Assuntos
Fosfatidilcolinas , Neoplasias da Próstata , Humanos , Masculino , Neoplasias da Próstata/diagnóstico , Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz , Triglicerídeos
12.
Talanta ; 236: 122849, 2022 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-34635239

RESUMO

Lipidomics has great potential for the discovery of biomarkers, elucidation of metabolic processes and identifying dysregulations in complex biological systems. Concerning biofluids like plasma or cerebrospinal fluid, several studies for the comparison of lipid extraction solvents have already been conducted. With respect to tissues, which can differ significantly in terms of dry matter content and composition, only few studies are available. The proper selection of an extraction method that covers the complexity and individuality of different tissues is challenging. The goal of this work was to provide a systematic overview on the potential of different extraction methods for a broad applicability. This study covers six different extraction procedures and four different reconstitution solvents applied to ten different porcine tissues. To get an overview of the individual lipid profiles, a workflow was developed for a fast and reliable tentative lipid annotation. Therefore, several machine learning tools were utilized, like the prediction of collision cross sections to support the tentative lipid identification in case of untargeted lipidomics. In terms of data evaluation, unsupervised (e.g. principal component analysis) and supervised (e.g. partial least square - discriminant analysis) methods were applied to visualize and subsequently interpret all generated information. Furthermore, the influence of the tissue composition on the extraction performance was investigated. It could be shown that the ten porcine tissues can be distinguished based on their lipid profile with the applied workflow and that the methyl-tert-butyl ether (MTBE) based extraction method (two-phase) showed the best overall performance for the 16 examined lipid species. With this method the highest number of features (428 in lung tissue) could be annotated. Upcoming one-phase extractions also showed a high potential concerning total number of extracted lipids. Methanol/MTBE/chloroform (MMC) extracted slightly less lipids (393 in lung and liver) than MTBE but turned out to be the best one-phase extraction method. Additionally, the numbers of extracted lipids obtained by isopropanol/water 90:10 (IPA90) (399 in stomach) and by isopropanol/methanol/chloroform (IMC) (395 in stomach) were similar to those of the modified Folch method (402 in stomach). One-phase extractions can therefore clearly be seen as preferable when a high throughput is needed.


Assuntos
Lipidômica , Lipídeos , Animais , Espectrometria de Massas , Solventes , Suínos , Fluxo de Trabalho
13.
Talanta ; 236: 122875, 2022 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-34635255

RESUMO

Molecularly imprinted polymers (MIPs) have aroused great attention as a new material for the removal or detection of pharmaceuticals and personal care products (PPCPs). However, it is not clear about the superiority and deficiency of MIPs in the process of removing or detecting PPCPs. Herein, we evaluated the performance of MIPs in the aspects of adsorption capacity, binding affinity, adsorption rate, and compatibility to other techniques, and proposed ways to improve its performance. Without regard to the selectivity of MIPs, for the PPCPs adsorption, MIPs surprisingly did not always perform better than the conventional adsorbents (non-imprinted polymers, biochar, activated carbon and resin), indicating that MIPs should be used where selectivity is crucial, for example recovery of specific PPCPs in an environmental sample extraction process. Compared to the traditional solid-phase extraction for PPCPs detection pretreatment, the usage of MIPs as substitute extraction agents could obtain high selectivity of specific substance, due to the uniformity and effectiveness of the specific sites. A promising development in the future would be to combine other simple and rapid quantitative technologies, such as electro/photochemical sensor and catalytic degradation, to realize rapid and sensitive detection of trace PPCPs.


Assuntos
Impressão Molecular , Adsorção , Polímeros Molecularmente Impressos , Polímeros , Extração em Fase Sólida
14.
Talanta ; 236: 122899, 2022 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-34635272

RESUMO

A real-time quartz crystal microbalance (QCM) cytosensor was first developed for dynamical and noninvasive monitoring of cell viscoelasticity for evaluation of apoptosis degree. In this work, human breast cancer cells MCF-7 and MDA-MB-231 were employed as cell model and respectively captured on the surface of QCM electrode modified with mercaptosuccinic acid and poly-l-lysine. Cell viscoelasticity was measured dynamically by real-time monitoring energy dissipation with QCM, and the dynamic diagram of the energy dissipation of MDA-MB-231 cells treated with curcumin was first obtained. The results displayed that the changes of energy dissipation in MDA-MB-231 cells and MCF-7 cells were 8.81 × 10-6 and 5.29 × 10-6, particularly due to the difference in cell viscoelasticity. Furthermore, curcumin was used to induce cell apoptosis and suppress energy dissipation of MDA-MB-231 cells. Combining apoptosis assay with QCM measurement, the results revealed good linear relationship between cell viscoelasticity inhibition and apoptosis rate with correlation coefficient R = 0.9908. The QCM cytosensor could rapidly, accurately, dynamically, and noninvasively monitor the changes of cell viscoelasticity for evaluation of apoptosis degree in MDA-MB-231 cells. The study established a new model for cell apoptosis assessment, facilitating understanding of the mechanisms of cell apoptosis on the aspect of mechanical properties.


Assuntos
Técnicas Biossensoriais , Neoplasias da Mama , Curcumina , Apoptose , Neoplasias da Mama/tratamento farmacológico , Curcumina/farmacologia , Feminino , Humanos , Viscosidade
15.
Gene ; 806: 145935, 2022 Jan 05.
Artigo em Inglês | MEDLINE | ID: mdl-34478821

RESUMO

Soluble molecules of programmed death ligand 1 (sPD-L1) are known to modulate T-cell depletion, an important mechanism of hepatitis B virus (HBV) persistence and liver disease progression. In addition, PD-L1 polymorphisms in the 3'-UTR can influence PD-L1 expression and have been associated with cancer risk, although not definitively. The purpose of this study was to investigate the association of PD-L1 polymorphisms and circulating levels of sPD-L1 in HBV infection and live disease progression. In this study, five hundred fifty-one HBV infected patients of the three clinically well-defined subgroups chronic hepatitis B (CHB, n = 186), liver cirrhosis (LC, n = 142) and hepatocellular carcinoma (HCC, n = 223) and 240 healthy individuals (HC) were enrolled. PD-L1 polymorphisms (rs2297136 and rs4143815) were genotyped by in-house validated ARMS assays. Logistic regression models were applied in order to determine the association of PD-L1 polymorphisms with HBV infection as well as with progression of related liver diseases. Plasma sPD-L1 levels were quantified by ELISA assays. The PD-L1 rs2297136 AA genotype was associated with HBV infection susceptibility (HBV vs. HC: OR = 1.6; 95%CI = 1.1-2.3; p = 0.0087) and disease progression (LC vs. CHB: OR = 1.8; 95%CI = 1.1-2.9; p = 0.018). Whereas, the rs2297136 GG genotype was a protective factor for HCC development. Plasma sPD-L1 levels were significantly high in HBV patients (p < 0.0001) and higher in the LC followed by CHB and HCC groups. High sPD-L1 levels correlated with increased liver enzymes and with advanced liver disease progression (Child-pugh C > B > A, p < 0.0001) and BCLC classification (BCLC D > C > B > A, p = 0.031). We could, for the first time, conclude that PD-L1 rs2297136 polymorphism and plasma sPD-L1 protein levels associate with HBV infection and HBV-related liver disease progression.


Assuntos
Antígeno B7-H1/genética , Carcinoma Hepatocelular/genética , Vírus da Hepatite B/patogenicidade , Hepatite B Crônica/genética , Cirrose Hepática/genética , Neoplasias Hepáticas/genética , Polimorfismo Genético , Regiões 3' não Traduzidas , Adulto , Idoso , Antígeno B7-H1/sangue , Biomarcadores/sangue , Carcinoma Hepatocelular/diagnóstico , Carcinoma Hepatocelular/etiologia , Carcinoma Hepatocelular/virologia , Estudos de Casos e Controles , Progressão da Doença , Feminino , Expressão Gênica , Predisposição Genética para Doença , Vírus da Hepatite B/crescimento & desenvolvimento , Hepatite B Crônica/complicações , Hepatite B Crônica/diagnóstico , Hepatite B Crônica/virologia , Humanos , Fígado/metabolismo , Fígado/patologia , Fígado/virologia , Cirrose Hepática/diagnóstico , Cirrose Hepática/etiologia , Cirrose Hepática/virologia , Neoplasias Hepáticas/diagnóstico , Neoplasias Hepáticas/etiologia , Neoplasias Hepáticas/virologia , Masculino , Pessoa de Meia-Idade , Valor Preditivo dos Testes
16.
Food Chem ; 366: 130559, 2022 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-34289440

RESUMO

In order to realize rapid and non-destructive detection of hardness for maize kernels, a method for quantitative hardness measurement was proposed based on hyperspectral imaging technology. Firstly, the regression model of hardness and moisture content was established. Then, based on reflectance hyperspectral imaging at wavelengths within 399.75-1005.80 nm, the prediction model of the moisture content was studied by the partial least squares regression (PLSR) based on the characteristic wavelengths, which was selected through successive projection algorithm (SPA). Finally, the hardness prediction model was validated by combing the prediction model of moisture content with the regression model of hardness. The coefficient of determination (R2), the root mean square error (RMSE) the ratio of performance-to-deviation (RPD) and the ratio of error range (RER) of hardness prediction were 0.912, 17.76 MPa, 3.41 and 14, respectively. Therefore, this study provided a method for rapid and non-destructive detection of hardness of maize kernels.


Assuntos
Imageamento Hiperespectral , Zea mays , Dureza , Análise dos Mínimos Quadrados , Espectroscopia de Luz Próxima ao Infravermelho
17.
Food Chem ; 366: 130589, 2022 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-34311241

RESUMO

Bioactive plant-derived molecules have emerged as therapeutic alternatives in the fight against the COVID-19 pandemic. In this investigation, principal bioactive compounds of the herbal infusion "horchata" from Ecuador were studied as potential novel inhibitors of the SARS-CoV-2 virus. The chemical composition of horchata was determined through a HPLC-DAD/ESI-MSn and GC-MS analysis while the inhibitory potential of the compounds on SARS-CoV-2 was determined by a computational prediction using various strategies, such as molecular docking and molecular dynamics simulations. Up to 51 different compounds were identified. The computational analysis of predicted targets reveals the compounds' possible anti-inflammatory (no steroidal) and antioxidant effects. Three compounds were identified as candidates for Mpro inhibition: benzoic acid, 2-(ethylthio)-ethyl ester, l-Leucine-N-isobutoxycarbonyl-N-methyl-heptyl and isorhamnetin and for PLpro: isorhamnetin-3-O-(6-Orhamnosyl-galactoside), dihydroxy-methoxyflavanone and dihydroxyphenyl)-5-hydroxy-4-oxochromen-7-yl]oxy-3,4,5-trihydroxyoxane-2-carboxylic acid. Our results suggest the potential of Ecuadorian horchata infusion as a starting scaffold for the development of new inhibitors of the SARS-CoV-2 Mpro and PLpro enzymes.


Assuntos
COVID-19 , Humanos , Simulação de Acoplamento Molecular , Simulação de Dinâmica Molecular , Pandemias , Inibidores de Proteases , SARS-CoV-2
18.
Food Chem ; 366: 130636, 2022 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-34314929

RESUMO

The study aimed to determine the efficiency of advanced chelate compounds-based trace minerals (OTM) in laying hens. Laying hens (240, 32 weeks old) were assigned to one of the following five groups: NOTM (no added trace minerals), CONTM (standard mineral salts), and three experimental groups in which chelates were used to replace 33, 66, and 100% of mineral salts (OTM33, OTM66, and OTM100, respectively). Each treatment had six replicates with eight hens per replicate. After 18 weeks, performance and physicochemical properties of eggs in all experimental groups was better than those in the NOTM group. Among the treatments, OTM66 and OTM100 produced the best results in terms of laying performance, yolk PUFA/SFA ratio, Zn and Se contents, and malondialdehyde concentration in both serum and yolk. In conclusion, up to 66% OTM supplementation was beneficial for performance, lipid and mineral composition of yolk, and oxidative status.


Assuntos
Galinhas , Ácidos Graxos , Ração Animal/análise , Animais , Dieta , Suplementos Nutricionais , Gema de Ovo/metabolismo , Ácidos Graxos/metabolismo , Feminino , Minerais/metabolismo , Estresse Oxidativo
19.
Food Chem ; 367: 130668, 2022 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-34343814

RESUMO

A novel polynomial correction method, order-adaptive polynomial correction (OAPC), was proposed to correct reflectance spectra with operator differences, and convolutional neural network (CNN) was used to develop analysis model to predict behenic acid in edible oils. With application of OAPC, CNN performed well with coefficient of determination of correction (R2cor) of 0.8843 and root mean square error of correction (RMSEcor) of 0.1182, outperforming partial least squares regression, support vector regression and random forest with OAPC, as well as the cases without OAPC. Based on 16 effective wavelengths selected by combination of bootstrapping soft shrinkage, random frog and Pearson's correlation, CNN and OAPC exhibited excellent performance with R2cor of 0.9560 and RMSEcor of 0.0730. Meanwhile, only 5% correction samples were selected by Kennard-Stone for OAPC. Overall, the proposed method could alleviate the impact of operator differences on spectral analysis, thereby providing potential to correct differences from measurement instruments or environments.


Assuntos
Óleos Vegetais , Máquina de Vetores de Suporte , Ácidos Graxos , Redes Neurais de Computação , Análise Espectral , Verduras
20.
Food Chem ; 366: 130689, 2022 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-34343950

RESUMO

This research established the optimal conditions for infusion extraction (IE) and ultrasound-assisted extraction (UAE) of bioactive components from laver (Porphyra dentata) using response surface methodology (RSM) and artificial neural network coupled with genetic algorithm (RSM-ANN-GA). The variables, temperatures (60, 80, and 100 ℃) and times (10, 15, and 20 min) were designed to optimise total phenolic, total flavonoid, total amino acid, a* value, and R-phycoerythrin content of laver extract. The optimised condition for IE and UAE was achieved at 60 ℃ for 18.08 min and 80.66℃ for 14.76 min in RSM while showing 60 ℃ for 19 min and 80℃ for 15 min in the RSM-ANN-GA mode, respectively. Results revealed that RSM-ANN-GA provided better predictability and greater accuracy than the RSM model and laver extract from UAE gave the higher values of responses compared to those from IE. These findings highlight the high-efficient extraction method along with better statistical approach.


Assuntos
Porphyra , Flavonoides , Redes Neurais de Computação , Fenóis , Extratos Vegetais
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