Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 43
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
J Hazard Mater ; 470: 134179, 2024 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-38565011

RESUMO

Microplastics (MPs) and fluoxetine are ubiquitous emerging pollutants in aquatic environments that may interact with each other due to the carrier effects of MPs, posing unpredictable risks to non-target organisms. However, limited studies have focused on the carrier effects of MPs in the aquatic food chain. This study evaluated the influences of polystyrene MPs on the trophic transfer and biotoxicity of fluoxetine in a simple food chain composed of brine shrimp (Artemia nauplii) and zebrafish (Danio rerio). The finding reveals that carrier effects of MPs enhanced the accumulation of waterborne fluoxetine in brine shrimp, but suppressed that in zebrafish due to the distinct retention times. The accumulated fluoxetine in shrimp was further transferred to fish through the food chain, which was alleviated by MPs due to their cleaning effects. In addition, the specific neurotransmission biotoxicity in fish induced by fluoxetine was mitigated by MPs, whilst the oxidative damage, apoptosis, and immune responses in zebrafish were reversely enhanced by MPs due to the stimulating effect. These findings highlight the alleviating effects of MPs on the trophic transfer and specific biotoxicity of fluoxetine in the food chain, providing new insights into the carrier effects of MPs in aquatic environments in the context of increasing global MP pollution.


Assuntos
Artemia , Fluoxetina , Cadeia Alimentar , Microplásticos , Poliestirenos , Poluentes Químicos da Água , Peixe-Zebra , Animais , Fluoxetina/toxicidade , Microplásticos/toxicidade , Poluentes Químicos da Água/toxicidade , Poliestirenos/toxicidade , Artemia/efeitos dos fármacos
2.
Huan Jing Ke Xue ; 45(3): 1859-1868, 2024 Mar 08.
Artigo em Chinês | MEDLINE | ID: mdl-38471897

RESUMO

To investigate the influences of functional groups on the biological effects caused by microplastics, the accumulation of three polystyrene microplastics (PS, PS-NH2, and PS-COOH) in zebrafish (Danio rerio) embryos were analyzed, and then the responses of metabolic functions and microbial communities in zebrafish larvae were revealed using the combination of the microbiome and metabolome methods. The results showed that all microplastics could accumulate in zebrafish with concentrations ranging from 143 to 175 µg·g-1, and there were no significant differences in the accumulation potentials among different PS treatments. Exposure to plain PS significantly affected the metabolic capacity of aminoglycosides in zebrafish larvae, whereas the metabolic processes of amino acids were affected by PS-NH2. In the PS-COOH treatment, the metabolic pathways of the tricarboxylic acid cycle, amino acids, and glycolysis in zebrafish were markedly altered. The metabolic functions of zebrafish larvae were changed by all PS microplastics, resulting in toxic effects on zebrafish, and the functional group modification of microplastics may have further enhanced these toxicities. Compared to that in the control, exposure to PS-NH2 significantly reduced the diversity of microbial communities in zebrafish larvae and increased the proportion of Proteobacteria in the composition, leading to an imbalance of the bacterial community in zebrafish and thus disrupting the metabolic functions in the fish. Therefore, the functional modifications of microplastics may significantly alter the related stresses on aquatic organisms, leading to unpredictable ecological risks.


Assuntos
Microplásticos , Poluentes Químicos da Água , Animais , Peixe-Zebra/metabolismo , Plásticos , Poluentes Químicos da Água/metabolismo , Poliestirenos , Larva/metabolismo , Aminoácidos
3.
Phytomedicine ; 125: 155276, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38295661

RESUMO

BACKGROUND: Coronary microembolism (CME) is commonly seen in the peri-procedural period of Percutaneous Coronary Intervention (PCI), where local platelet activation and endothelial cell inflammation crosstalk may lead to micro thrombus erosion and rupture, with serious consequences. Qihuang Zhuyu Formula (QHZYF) is a Chinese herbal compound with high efficacy against coronary artery disease, but its antiplatelet mechanism is unclear. HYPOTHESIS/PURPOSE: This study aimed to elucidate the effects and mechanisms of QHZYF on sodium laurate-induced CME using network pharmacology and in vitro and in vivo experiments. METHODS: We employed high-performance liquid chromatography mass spectrometry to identify the main components of QHZYF. Network pharmacology analysis, molecular docking and surface plasmon resonance (SPR) were utilized to predict the primary active components, potential therapeutic targets, and intervention pathways mediating the effects of QHZYF on platelet activation. Next, we pretreated a sodium laurate-induced minimally invasive CME rat model with QHZYF. In vivo experiments were performed to examine cardiac function in rats, to locate coronary arteries on heart sections to observe internal microthrombi, to extract rat Platelet-rich plasma (PRP) for adhesion assays and CD62p and PAC-1 (ITGB3/ITGA2B) flow assays, and to measure platelet-associated protein expression in PRP. In vitro clot retraction and Co-culture of HUVECs with PRP were performed and the gene pathway was validated through flow cytometry and immunofluorescence. RESULTS: Combining UPLC-Q-TOF/MS technology and database mining, 78 compounds were finally screened as the putative and representative compounds of QHZYF, with 75 crossover genes associated with CME. QHZYF prevents CME mainly by regulating key pathways of the inflammation and platelets, including Lipid and atherosclerosis, Fluid shear stress, platelet activation, and PI3K-Akt signaling pathways. Five molecules including Calyson, Oroxin A, Protosappanin A,Kaempferol and Geniposide were screened and subjected to molecular docking and SPR validation in combination with Lipinski rules (Rule of 5, Ro5). In vivo experiments showed that QHZYF not only improved myocardial injury but also inhibited formation of coronary microthrombi. QHZYF inhibited platelet activation by downregulating expression of CD62p receptor and platelet membrane protein αIIbß3 and reduced the release of von Willebrand Factor (vWF), Ca2+ particles and inflammatory factor IL-6. Further analysis revealed that QHZYF inhibited the activation of integrin αIIbß3, via modulating the PI3K/Akt pathways. In in vitro experiments, QHZYF independently inhibited platelet clot retraction. Upon LPS induction, the activation of platelet membrane protein ITGB3 was inhibited via the PI3K/Akt pathway, revealing an important mechanism for attenuating coronary microthrombosis. We performed mechanistic validation using PI3K inhibitor LY294002 and Akt inhibitor MK-2206 to show that QHZYF inhibited platelet membrane protein activation and inflammation to improved coronary microvessel embolism by regulating PI3K/Akt/αIIbß3 pathways, mainly by inhibiting PI3K and Akt phosphorylation. CONCLUSION: QHZYF interferes with coronary microthrombosis through inhibition of platelet adhesion, activation and inflammatory crosstalk, thus has potential in clinical anti-platelet applications. Calyson, Oroxin A, Protosappanin A, Kaempferol and Geniposide may be the major active ingredient groups of QHZYF that alleviate coronary microthrombosis.


Assuntos
Medicamentos de Ervas Chinesas , Iridoides , Intervenção Coronária Percutânea , Fenóis , Trombose , Ratos , Animais , Fosfatidilinositol 3-Quinases/metabolismo , Proteínas Proto-Oncogênicas c-akt/metabolismo , Quempferóis/farmacologia , Agregação Plaquetária , Simulação de Acoplamento Molecular , Ativação Plaquetária , Complexo Glicoproteico GPIIb-IIIa de Plaquetas/metabolismo , Trombose/tratamento farmacológico , Inflamação , Medicamentos de Ervas Chinesas/farmacologia
4.
J Hazard Mater ; 463: 132951, 2024 02 05.
Artigo em Inglês | MEDLINE | ID: mdl-37951174

RESUMO

The concerns on the carriers of microplastics (MPs) on co-existing pollutants in aquatic environments are sharply rising in recent years. However, little is known about their interactions on the colonization of microbiota, especially for the spread of pathogens and antibiotic resistance genes (ARGs). Therefore, this study aimed to investigate the influences on the propagation of ARGs in sediments by the co-exposure of different MPs and sulfamethoxazole (SMX). The results showed that the presence of MPs significantly enhanced the contents of total organic carbon, while having no effects on the removal of SMX in sediments. Exposure to SMX and MPs obviously activated the microbial carbon utilization capacities based on the BIOLOG method. The propagation of ARGs in sediments was activated by SMX, which was further promoted by the presence of polylactic acid (PLA) MPs, but significantly lowered by the co-exposed polyethylene (PE) MPs. This apparent difference may be attributed to the distinct influence on the antibiotic efflux pumps of two MPs. Moreover, the propagation of ARGs may be also dominated by microbial carbon metabolism in sediments, especially through regulating the carbon sources of carboxylic acids, carbohydrates, and amino acids. This study provides new insights into the carrier effects of MPs in sediments.


Assuntos
Antibacterianos , Sulfametoxazol , Antibacterianos/farmacologia , Microplásticos/toxicidade , Plásticos , Carbono , Resistência Microbiana a Medicamentos/genética , Polietileno , Genes Bacterianos
5.
ChemistryOpen ; 11(11): e202200161, 2022 11.
Artigo em Inglês | MEDLINE | ID: mdl-36351758

RESUMO

Three-dimensional porous graphene (3D-PG) has attracted much attention due to its excellent electrochemical performance. Chemical reduction is one of common methods for preparing porous graphene. In order to develop a green and facile method for preparing three-dimensional porous graphene, in this paper, 3D-PG was fabricated by reduction of graphene oxide (GO) with ascorbic acid (AA) as reductant in hydrothermal condition based on non-toxic, non-flammable and mild reducing performance of ascorbic acid. It was found that the size and distribution of pores could be controlled by the reduction time and the concentration of AA in the solution. The pore sizes in R0, R1 and R2 were in the range of 0.5-1 µm, 1-1.5 µm, and 1.5-3 µm, respectively. It was found that the average pore size and volume increased along with the amount of reductants. Under optimal conditions - a reaction time of 20 h and a ratio of GO to AA=1 : 1 - the CV area of the so-obtained sample R1-20 at 100 mV was 0.06 and the specific capacitance of the 3D-PG electrode reaches 153.5 F ⋅ g-1 , which is suitable for use in supercapacitors.


Assuntos
Grafite , Grafite/química , Ácido Ascórbico/química , Técnicas Eletroquímicas/métodos , Porosidade
6.
Food Chem ; 386: 132808, 2022 Aug 30.
Artigo em Inglês | MEDLINE | ID: mdl-35364493

RESUMO

With the expansion of the functional food market, the qualification assessment of these products has become a major challenge, and efficient analytical tools are urgently needed. Here, a miniature mass spectrometer (MS) with self-aspiration capillary electrospray ionization (SACESI) source and ion trap analyzer was developed for rapid screening of various illegally added drugs in functional foods. No chromatographic separation was required, but a simplified two-step pretreatment method was developed to reduce the operational procedures and time consumption of the entire analysis. SACESI source uses capillary action to drive solution injection, which utilizes a simple structure and convenient operation to constitute a kind of disposable MS detection solution. To achieve accurate and automatic identification, an intelligent recognition algorithm with steps of spectrum preprocessing, characteristic peak matching, and support vector machine learning was constructed. The relative accuracy of rapid screening of 31 suspicious drugs in various samples is up to 99.78%. It achieves 100% correct identification for the 55 batches of actual samples captured by on-site inspection, which demonstrates the feasibility of the proposed analytical system and strategy in food safety applications.


Assuntos
Alimento Funcional , Espectrometria de Massas
7.
Metabolites ; 12(2)2022 Jan 19.
Artigo em Inglês | MEDLINE | ID: mdl-35208168

RESUMO

Plants are continuously interacting with other organisms to optimize their performance in a changing environment. Mycorrhization is known to affect the plant growth and nutrient status, but it also can lead to adjusted plant defense and alter interactions with other trophic levels. Here, we studied the effect of Laccaria bicolor-mycorrhization on the poplar (Populus x canescens) metabolome and volatilome on trees with and without a poplar leaf beetle (Chrysomela populi) infestation. We analyzed the leaf and root metabolomes employing liquid chromatography-mass spectrometry, and the leaf volatilome employing headspace sorptive extraction combined with gas-chromatography-mass spectrometry. Mycorrhization caused distinct metabolic adjustments in roots, young/infested leaves and old/not directly infested leaves. Mycorrhization adjusted the lipid composition, the abundance of peptides and, especially upon herbivory, the level of various phenolic compounds. The greatest change in leaf volatile organic compound (VOC) emissions occurred four to eight days following the beetle infestation. Together, these results prove that mycorrhization affects the whole plant metabolome and may influence poplar aboveground interactions. The herbivores and the mycorrhizal fungi interact with each other indirectly through a common host plant, a result that emphasizes the importance of community approach in chemical ecology.

8.
Plant J ; 108(3): 617-631, 2021 11.
Artigo em Inglês | MEDLINE | ID: mdl-34369010

RESUMO

Plants interact with other organisms employing volatile organic compounds (VOCs). The largest group of plant-released VOCs are terpenes, comprised of isoprene, monoterpenes, and sesquiterpenes. Mono- and sesquiterpenes are well-known communication compounds in plant-insect interactions, whereas the smallest, most commonly emitted terpene, isoprene, is rather assigned a function in combating abiotic stresses. Recently, it has become evident that different volatile terpenes also act as plant-to-plant signaling cues. Upon being perceived, specific volatile terpenes can sensitize distinct signaling pathways in receiver plant cells, which in turn trigger plant innate immune responses. This vastly extends the range of action of volatile terpenes, which not only protect plants from various biotic and abiotic stresses, but also convey information about environmental constraints within and between plants. As a result, plant-insect and plant-pathogen interactions, which are believed to influence each other through phytohormone crosstalk, are likely equally sensitive to reciprocal regulation via volatile terpene cues. Here, we review the current knowledge of terpenes as volatile semiochemicals and discuss why and how volatile terpenes make good signaling cues. We discuss how volatile terpenes may be perceived by plants, what are possible downstream signaling events in receiver plants, and how responses to different terpene cues might interact to orchestrate the net plant response to multiple stresses. Finally, we discuss how the signal can be further transmitted to the community level leading to a mutually beneficial community-scale response or distinct signaling with near kin.


Assuntos
Plantas/metabolismo , Terpenos/química , Terpenos/metabolismo , Compostos Orgânicos Voláteis/metabolismo , Células Vegetais/metabolismo , Reguladores de Crescimento de Plantas/metabolismo , Imunidade Vegetal , Plantas/imunologia , Transdução de Sinais/fisiologia , Especificidade da Espécie , Compostos Orgânicos Voláteis/química
9.
J Org Chem ; 85(15): 9503-9513, 2020 Aug 07.
Artigo em Inglês | MEDLINE | ID: mdl-32600039

RESUMO

An efficient and practical protocol for visible-light-induced decarboxylative cyclization of 2-alkenylarylisocyanides with α-oxocarboxylic acids has been developed, which afforded a broad range of 2-acylindoles in moderate to good yields. The reaction proceeds through a cascade of acyl radical addition/cyclization reactions under irradiation of an Ir3+ photoredox catalyst without external oxidants and features simple operation, scalability, a broad substrate scope, and good functional group tolerance.

10.
Chem Asian J ; 15(7): 1175-1179, 2020 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-32056375

RESUMO

A practical silver-catalyzed decarboxylative allylation of α,α-difluoroarylacetic acids with allyl sulfones is described, which provides a variety of ß,ß-difluorinated alkenes in good yields. Notably, the reaction proceeds smoothly in water with good functional group tolerance. The practicality and synthetic value of this process was demonstrated by scaled-up experiment and elaboration of the products via reduction or Heck reaction. Primary mechanism investigations suggest that a radical process might be involved.

11.
Vox Sang ; 114(7): 694-700, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31286533

RESUMO

OBJECTIVE: Fresh whole blood (WB) has been used in military applications and cardiac surgery. We undertook a study of the coagulation properties of refrigerated WB stored for 21 days and compared them with the properties of reconstituted WB. STUDY DESIGN AND METHODS: Ten WB units were obtained from healthy volunteer donors and stored at 4 ± 2°C. Samples were obtained on Days 1, 2, 4, 6, 8, 10, 14 and 21 from the WB units. Ten units of reconstituted WB were prepared with a ratio of red cells, platelets and plasma of 1:1:1. Tests included complete blood count, electrolyte, routine coagulation, blood coagulation factor and thromboelastography. RESULTS: There was a progressive decline in Hb, WBC, PLT, sodium and coagulation factors but a progressive increase in APTT, PT and potassium in WB. The concentrations of factor (F)V and FVIII as well as FII and FX of WB were higher before Days 4, 2, 8 and 14, respectively, compared with the concentrations of reconstituted WB. The concentrations of FVII, FIX, FXI and FXII in WB were found to be equal to or higher than those in reconstituted WB throughout the course of 21 days. TEG variables in all WB units were normal throughout the course of 10 days. The mean PT and APTT of WB were lower than those of reconstituted WB before Days 14 and 10, respectively. CONCLUSION: This study suggests that the coagulation properties of refrigerated WB were equal to or superior to those of reconstituted WB for a minimum of 10 days.


Assuntos
Coagulação Sanguínea , Preservação de Sangue/métodos , Criopreservação/métodos , Preservação de Sangue/efeitos adversos , Humanos , Tromboelastografia/métodos , Tempo de Coagulação do Sangue Total/métodos
12.
Zhongguo Shi Yan Xue Ye Xue Za Zhi ; 26(5): 1553-1558, 2018 Oct.
Artigo em Chinês | MEDLINE | ID: mdl-30295283

RESUMO

OBJECTIVE: To study the coagulation properties the refrigerated whole blood stored at 4℃. METHODS: Ten units of whole blood were obtained from healthy volunteer donors and stored at 4±2℃ for 21 days. Samples were collected on the day after donation and on days 2, 4, 6, 8, 10, 14 and 21 for delection including complete blood count, electrolyte, APTT, PT, Fg, blood coagulation factors, and thromboelastography(TEG). RESULTS: The levels of Hb, WBC, Plt, sodium and potassium in each sample accorded with standard of storing whole blood. The level of Hb, WBC, Plt and Na+ decreased along with prolonging of storage time, while the K+ level increased along with prolonging of stored time, APTT and PT prolonged along with prolonging of thored time, PT>17 min at d 21, the Fg level change was no-obvious, The level of factor Ⅴ and Ⅷ decreased more than 50 % of baseline on d 6 and 4 respectively; the levels of factor Ⅱ, Ⅶ, Ⅸ, Ⅹ, Ⅺ, Ⅻ showed decreasing trend, but their levels were less than 40 % of baseline values at d 21. TEG test showed that no abnormalily of R value was found, the abnormal valnes of K and Angle were observed at d 21, the abnormal value of MA was observed at d 14. CONCLUSION: The whole blood stored for 10 days possesses normal coagulation function showing important significance for treatment of hemorrhage from war injury and surgical openation of heart and chest.


Assuntos
Coagulação Sanguínea , Tromboelastografia , Fatores de Coagulação Sanguínea , Testes de Coagulação Sanguínea , Hemorragia , Humanos
13.
Biomed Pharmacother ; 105: 204-214, 2018 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-29857300

RESUMO

Platelets are implicated as key players in the metastatic dissemination of tumor cells. Previous evidence demonstrated platelets retained cytoplasmic RNAs with physiologically activity, splicing pre-mRNA to mRNA and translating into functional proteins in response to external stimulation. Recently, platelets gene profile of healthy or diseased individuals were characterized with the help of RNA sequencing (RNA-Seq) in some studies, leading to new insights into the mechanisms underlying disease pathogenesis. In this study, we performed RNA-seq in platelets from 7 healthy individuals and 15 non-small cell lung cancer (NSCLC) patients. Our data revealed a subset of near universal differently expressed gene (DEG) profiles in platelets of metastatic NSCLC compared to healthy individuals, including 626 up-regulated RNAs (mRNAs and ncRNAs) and 1497 down-regulated genes. The significant over-expressed genes showed enrichment in focal adhesion, platelets activation, gap junction and adherens junction pathways. The DEGs also included previously reported tumor-related genes such as PDGFR, VEGF, EGF, etc., verifying the consistence and significance of platelet RNA-Seq in oncology study. We also validated several up-regulated DEGs involved in tumor cell-induced platelet aggregation (TCIPA) and tumorigenesis. Additionally, transcriptomic comparison analyses of NSCLC subgroups were conducted. Between non-metastatic and metastatic NSCLC patients, 526 platelet DEGs were identified with the most altered expression. The outcomes from subgroup analysis between lung adenocarcinoma and lung squamous cell carcinoma demonstrated the diagnostic potential of platelet RNA-Seq on distinguishing tumor histological types.


Assuntos
Plaquetas/metabolismo , Carcinoma Pulmonar de Células não Pequenas/sangue , Carcinoma Pulmonar de Células não Pequenas/genética , Neoplasias Pulmonares/sangue , Neoplasias Pulmonares/genética , Análise de Sequência de RNA , Transcriptoma/genética , Adulto , Feminino , Perfilação da Expressão Gênica , Regulação Neoplásica da Expressão Gênica , Ontologia Genética , Humanos , Masculino , Pessoa de Meia-Idade , Poliadenilação , RNA/metabolismo , Reprodutibilidade dos Testes , Regulação para Cima/genética
14.
Clin Lab ; 60(6): 1049-54, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-25016712

RESUMO

BACKGROUND: Human chimerism with normal phenotype derived from the fusion of two different zygotes is a rare phenomenon. We describe a case of a phenotypically normal 17-year-old diagnosed with dispermic chimerism during routine ABO blood grouping. METHODS: ABO grouping, ABO genotyping, karyotyping, human leukocyte antigen (HLA) typing, and short tandem repeat (STR) analysis were performed. RESULTS: Forward typing with anti-A and anti-B sera resulted in mixed-field agglutination of red blood cells. The mother and father were blood group O and AB, respectively. The proposita had O1, A201 and B alleles in the ABO locus; O1 was a maternal allele, while A201 and B were the paternal alleles. The proposita karyotype was 46,XX/46,XY. HLA typing revealed that the proposita had three alleles (46, 51, 54) at the HLA-B locus, with the additional allele of paternal origin. STR analysis identified three alleles for five of the 15 markers (D2S1338, TPOX, D8S1179, D19S433, and D21S11) analyzed in the proposita's blood- and skin fibroblast-derived DNA. The additional alleles of TPOX, D8S1179, and D21S11 were of paternal origin. CONCLUSIONS: The genetic findings suggest that this proposita was produced by dispermic fertilization of two identical haploid ova formed by parthenogenetic activation.


Assuntos
Sistema ABO de Grupos Sanguíneos/sangue , Tipagem e Reações Cruzadas Sanguíneas , Quimera/sangue , Adolescente , Feminino , Humanos , Repetições de Microssatélites , Fenótipo
15.
Biosens Bioelectron ; 58: 9-16, 2014 Aug 15.
Artigo em Inglês | MEDLINE | ID: mdl-24607616

RESUMO

Sensitive determination of carcinoembryonic antigen (CEA) is very important in clinical research and diagnosis. Herein we report the design and synthesis of a new kind of immunosensor based on the benefits of hyperbranched structure. The hyperbranched polyester was grafted to the surface of indium tin oxides glass (ITO) electrode, and the grafting processes were characterized by attentuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). After CEA and horse radish peroxidase (HRP)-labeled antibody-conjugated AuNPs (HRP-Ab2-AuNPs) bioconjugates were immobilized on the surface of the hyperbranched structure-modified electrode, the optimized conditions of the above electrode were investigated. Moreover, the analytical performance of the proposed immunosensor showed a high sensitivity, a linear range from 0.01 to 80ng/mL with a low detection limit of 2.36pg/mL, and good selectivity for CEA. The designed immunoassay system holds great potential for ultrasensitive electrochemical biosensing of other analytes.


Assuntos
Técnicas Biossensoriais/instrumentação , Antígeno Carcinoembrionário/análise , Condutometria/instrumentação , Imunoensaio/instrumentação , Microquímica/instrumentação , Antígeno Carcinoembrionário/imunologia , Dendrímeros , Eletrodos , Desenho de Equipamento , Análise de Falha de Equipamento
16.
Colloids Surf B Biointerfaces ; 104: 61-5, 2013 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-23298589

RESUMO

The poly(N-isopropylacrylamide)-g-poly(N-isopropylacrylamide-co-styrene) microspheres (PNNS-MSs) were prepared by an emulsifier-free emulsion polymerization method. The blood compatibility of PNNS-MSs was characterized by in vitro for coagulation tests, hemolysis assay, plasma recalcification time, complement activation, platelet activation, and cytotoxicity experiments. The results showed that the PNNS-MSs have good blood compatibility and lack cytotoxicity, which may be attributed to the formation of a strong interfacial hydration layer that result from amphiphilic molecular structure of the PNIPAM shell and minimal interaction between PNNS-MSs interfaces and blood components. The PNNS-MSs provide a promising platform of blood circulation system for early illness diagnosis and therapy.


Assuntos
Resinas Acrílicas/farmacologia , Anticoagulantes/farmacologia , Materiais Biocompatíveis/farmacologia , Coagulação Sanguínea/efeitos dos fármacos , Plaquetas/efeitos dos fármacos , Microesferas , Resinas Acrílicas/síntese química , Resinas Acrílicas/química , Animais , Anticoagulantes/síntese química , Anticoagulantes/química , Materiais Biocompatíveis/síntese química , Materiais Biocompatíveis/química , Testes de Coagulação Sanguínea , Hemólise , Humanos , Tamanho da Partícula , Coelhos , Propriedades de Superfície
17.
J Mater Chem B ; 1(6): 801-809, 2013 Feb 14.
Artigo em Inglês | MEDLINE | ID: mdl-32260738

RESUMO

Analysts are always enthusiastic about finding new materials with good biocompatibility to improve the behavior of biosensors. In this case, a novel electrochemical biosensor, which can be conveniently applied to veraciously evaluate the level of blood glucose with the help of antibiofouling technology, was prepared and investigated. More details of the preparation of polyurethane-Pluronic F127 (PU-F127) nanospheres and immobilizing glucose oxidase (GOx) on (PU-F127)-glass carbon electrode (GCE) were presented. The electrochemical behavior of the biosensor in whole blood was studied. The cyclic voltammetric results indicated that GOx immobilized on the PU-F127 nanospheres exhibited direct electron transfer reaction, which led to stable amperometric biosensing for glucose with a detection limit of 1.14 × 10-5 M (S/N = 3) in whole blood. The PU-F127 nanospheres modified GCE also offered good anti-interference ability to ascorbic acid (AA) and uric acid (UA), especially when a detection potential of -0.49 V was employed. The good stability and repeatability of this biosensor were also proved. The integration of the technologies, which include anticoagulants, sensors and nanoscience, will have significant input to high-performance biosensors relevant to diagnostics and therapies of interest for human health.

18.
J Mater Chem B ; 1(4): 447-453, 2013 Jan 28.
Artigo em Inglês | MEDLINE | ID: mdl-32260815

RESUMO

Recent advances in micro- and nanotechnology have provided a variety of particles with highly controlled shapes, sizes, chemical composition, and interesting properties. In this work, a novel kind of heparin-functionalized polyurethane microsphere (Hep-PU MS) was synthesized by a single-step phase separation method. The blood compatibility and anticoagulant effect of the Hep-PU MSs were investigated using coagulation tests, hemolysis assay, complement and platelet activation detection, cytotoxicity analysis, and drug loading and release study. The results confirmed that the heparin can substantially enhance the anticoagulant properties of PU MSs, and the Hep-PU MSs have the potential to be used as a mild anticoagulant compared to heparin. With the simplicity of the functionalized method, the excellent hemocompatibility and the slow-release of heparin, the Hep-PU MSs with desirable bioproperties can be readily tailored to cater to various biomedical applications.

19.
Zhongguo Shi Yan Xue Ye Xue Za Zhi ; 17(4): 879-82, 2009 Aug.
Artigo em Chinês | MEDLINE | ID: mdl-19698221

RESUMO

The aim of the present study was to investigate the anti-proliferation and pro-apoptosis effect of Coix lachrymajobi L varma-yuan on acute T lymphoblast leukemia cell line Jurkat cells and its mechanism. Jurkat cells were treated with Coix lachrymajobi L varma-yuan of various concentrations (0, 0.4, 0.8, 1.6 mg/ml) for 24h. The inhibitory ratio was measured by Cell Counting Kit-8. The effects of Coix lachrymajobi L varma-yuan on apoptosis of Jurkat cells were determined by Hoechst 33258, PI and Annexin V-FITC/PI double staining. The mitochondrial membrane potential was analyzed by JC-1 staining. The results demonstrated that Coix lachrymajobi L varma-yuan inhibited the proliferation of Jurkat cells, and induced chromatin condensation and fragmentation (characteristic of apoptosis) and loss of mitochondrial membrane potential. In conclusion, Coix lachrymajobi L varma-yuan can inhibit the cell proliferation and induce the apoptosis of Jurkat cells. These effects relate to loss of mitochondrial membrane potential. These results suggest that Coix lachrymajobi L varma-yuan may be of value in treating lymphoma.


Assuntos
Apoptose/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Coix/química , Óleos de Plantas/farmacologia , Humanos , Células Jurkat , Potencial da Membrana Mitocondrial
20.
Zhongguo Shi Yan Xue Ye Xue Za Zhi ; 16(4): 922-5, 2008 Aug.
Artigo em Chinês | MEDLINE | ID: mdl-18718091

RESUMO

This study was purposed to investigate the effect of highway transportation on the quality of blood components so as to provide experimental basis to meet the needs of military operations. The transport condition was simulated by random vibration test. The red blood cells, leukocyte-reduced red blood cells, washed red blood cells were randomly vibrated (C Road) for 4 hours. Then, these blood components were stored in refrigerator for 15 days (4 degrees C). Six milliliters of blood were collected before vibration, after vibration, and at day 15 days of storage after vibration, respectively. The suspension was isolated. The free hemoglobin (FHb), routine hematological parameters, and biochemical indexes were determined. The results showed that FHb, lactate dehydrogenase (LDH), K(+) of red blood cells and leukocyte-reduced red blood cells did not significantly change after vibration and storage. However, FHb, LDH and K(+) of washed red blood cells increased significantly after simulated transportation (p < 0.05). The levels of these parameters at day 15 of storage after vibration were also significantly higher than those after vibration (p < 0.01). The changes of other hematological parameters were not significant in three blood components after vibration (C Road) and storage for 15 day. In conclusion, red blood cells and leukocyte-reduced red blood cells were qualified for clinic transfusion even after transportation within 4 hours for 15 day storage later, if they were kept in proper blood container and protected from damping. However, the washed red blood cells could not be used for clinic after similar transport in the military operations.


Assuntos
Preservação de Sangue , Criopreservação , Eritrócitos , Meios de Transporte , Eritrócitos/química , Humanos , L-Lactato Desidrogenase/sangue , Vibração
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...