Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 28
Filtrar
1.
Microbes Infect ; : 105350, 2024 May 07.
Artigo em Inglês | MEDLINE | ID: mdl-38723999

RESUMO

The widespread transmission of SARS-CoV-2 in humans poses a serious threat to public health security, and a growing number of studies have discovered that SARS-CoV-2 infection in wildlife and mutate over time. This article mainly reports the first systematic review and meta-analysis of the prevalence of SARS-CoV-2 in wildlife. The pooled prevalence of the 29 included articles was calculated by us using a random effects model (22.9%) with a high heterogeneity (I2 = 98.7%, p = 0.00). Subgroup analysis and univariate regression analysis found potential risk factors contributing to heterogeneity were country, wildlife species, sample type, longitude, and precipitation. In addition, the prevalence of SARS-CoV-2 in wildlife increased gradually over time. Consequently, it is necessary to comprehensively analyze the risk factors of SARS-CoV-2 infection in wildlife and develop effective control policies, as well as to monitor the mutation of SARS-CoV-2 in wildlife at all times to reduce the risk of SARS-CoV-2 transmission among different species.

2.
Int J Biol Macromol ; 269(Pt 2): 132141, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38723809

RESUMO

To enhance the flame retardancy and mechanical performance of PLA, a polyelectrolyte complex predicated on lignin was obtained by electrostatic mutual adsorption of ammonium polyphosphate (APP), polyethyleneimine (PEI), and copper ions as raw materials. The FT-IR spectra and EDX analysis confirmed the successful synthesis of a lignin-based flame retardant hybrid (APL-Cu2+) containing copper, phosphorus, and nitrogen elements. The combustion test results showed that the peak heat release rate and total heat release of the PLA composite containing 12 wt% APL-Cu2+ were decreased by 15.1 % and 18.2 %, respectively, as compared to those of pure PLA. The char residue morphology observation revealed that the addition of APL-Cu2+ could promote the formation of a highly dense and stable graphitized char layer, while TG-MS detected the emission of refractory gases such as ammonia gas, carbon dioxide, and water during combustion. The strong hydrogen bonding between APL-Cu2+ and the PLA matrix kept the composite maintaining good strength and toughness. The tensile strength and impact strength of PLA/6APL-Cu2+ increased by 4.73 % and 65.71 %, respectively, due to its high crystallinity and good interfacial compatibility. This work provides a feasible method to develop biobased flame retardant hybrids for PLA composites with better fire safety and improved mechanical properties.


Assuntos
Cobre , Retardadores de Chama , Lignina , Poliésteres , Lignina/química , Cobre/química , Poliésteres/química , Incêndios/prevenção & controle , Fenômenos Mecânicos , Resistência à Tração , Espectroscopia de Infravermelho com Transformada de Fourier , Polietilenoimina/química
3.
Int Immunopharmacol ; 130: 111710, 2024 Mar 30.
Artigo em Inglês | MEDLINE | ID: mdl-38394888

RESUMO

Influenza virus is a kind of virus that poses several hazards of animal and human health. Therefore, it is important to develop an effective vaccine to prevent influenza. To this end we successfully packaged recombinant adenovirus rAd-NP-M2e-GFP expressing multiple copies of influenza virus conserved antigens NP and M2e and packaged empty vector adenovirus rAd-GFP. The effect of rAd-NP-M2e-GFP on the activation of dendritic cell (DC) in vitro and in vivo was detected by intranasal immunization. The results showed that rAd-NP-M2e-GFP promoted the activation of DC in vitro and in vivo. After the primary immunization and booster immunization of mice through the nasal immune way, the results showed that rAd-NP-M2e-GFP induced enhanced local mucosal-specific T cell responses, increased the content of SIgA in broncho alveolar lavage fluids (BALF) and triggered the differentiation of B cells in the germinal center. It is proved that rAd-NP-M2e-GFP can significantly elicit mucosal immunity and systemic immune response. In addition, rAd-NP-M2e-GFP could effectively protect mice after H1N1 influenza virus challenge. To lay the foundation and provide reference for further development of influenza virus mucosal vaccine in the future.


Assuntos
Vacinas contra Adenovirus , Vírus da Influenza A Subtipo H1N1 , Vacinas contra Influenza , Infecções por Orthomyxoviridae , Animais , Camundongos , Humanos , Adenoviridae/genética , Imunização , Vacinas Sintéticas , Imunidade nas Mucosas , Camundongos Endogâmicos BALB C , Anticorpos Antivirais
4.
Microb Pathog ; 182: 106237, 2023 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-37422174

RESUMO

A healthy organism is the result of host-microbiome co-evolution. Microbial metabolites can also stimulate immune cells to reduce intestinal inflammation and permeability. Gut dysbiosis will lead to a variety of autoimmune diseases, such as Type 1 diabetes (T1D). Most of probiotics, such as Lactobacillus casei, Lactobacillus reuteri, Bifidobacterium bifidium, and Streptococcus thermophiles, can improve the intestinal flora structure of the host, reduce intestinal permeability, and relieve symptoms of T1D patients if ingested above probiotics in sufficient amounts. Lactobacillus Plantarum NC8, a kind of Lactobacillus, whether it has an effect on T1D, and the mechanism of it regulating T1D is still unclear. As a member of the inflammatory family, NLRP3 inflammasome can enhance inflammatory responses by promoting the production and secretion of proinflammatory cytokines. Many previous studies had shown that NLRP3 also plays an important role in the development of T1D. When the NLRP3 gene is deleted, the disease progression of T1D will be delayed. Therefore, this study investigated whether Lactobacillus Plantarum NC8 can alleviate T1D by regulating NLRP3. The results demonstrated that Lactobacillus Plantarum NC8 and its metabolites acetate play a role in T1D by co-modulating NLRP3. Lactobacillus Plantarum NC8 and acetate can reduce the damage of T1D in the model mice, even if orally administered them in the early stage of T1D. The number of Th1/Th17 cells in the spleen and pancreatic lymph nodes (PLNs) of T1D mice were significantly reduced by oral Lactobacillus Plantarum NC8 or acetate. The expression of NLRP3 in the pancreas of T1D mice or murine macrophages of inflammatory model were significantly inhibited by treatment with Lactobacillus Plantarum NC8 or acetate. In addition, the number of macrophages in the pancreas were significantly reduced by the treatment with Lactobacillus Plantarum NC8 or acetate. In summary, this study indicated that the regulatory mechanism of Lactobacillus Plantarum NC8 and its metabolite acetate to T1D maybe via inhibiting NLRP3 and provides a novel insights into the mechanism of the alleviated role of probiotics to T1D.


Assuntos
Diabetes Mellitus Tipo 1 , Lactobacillus plantarum , Probióticos , Animais , Camundongos , Lactobacillus plantarum/metabolismo , Diabetes Mellitus Tipo 1/terapia , Proteína 3 que Contém Domínio de Pirina da Família NLR/metabolismo , Lactobacillus/genética , Células Th1 , Probióticos/farmacologia
5.
Sci Rep ; 13(1): 7090, 2023 05 01.
Artigo em Inglês | MEDLINE | ID: mdl-37127654

RESUMO

Biogenesis of organelles requires targeting of a subset of proteins to specific subcellular domains by signal peptides or mechanisms controlling mRNA localization and local translation. How local distribution and translation of specific mRNAs for organelle biogenesis is achieved remains elusive and likely to be dependent on the cellular context. Here we identify Trinucleotide repeat containing-6a (Tnrc6a), a component of the miRNA pathway, distinctively localized to apical granules of differentiating airway multiciliated cells (MCCs) adjacent to centrioles. In spite of being enriched in TNRC6A and the miRNA-binding protein AGO2, they lack enzymes for mRNA degradation. Instead, we found these apical granules enriched in components of the mRNA translation machinery and newly synthesized proteins suggesting that they are specific hubs for target mRNA localization and local translation in MCCs. Consistent with this, Tnrc6a loss of function prevented formation of these granules and led to a broad reduction, rather than stabilization of miRNA targets. These included downregulation of key genes involved in ciliogenesis and was associated with defective multicilia formation both in vivo and in primary airway epithelial cultures. Similar analysis of Tnrc6a disruption in yolk sac showed stabilization of miRNA targets, highlighting the potential diversity of these mechanisms across organs.


Assuntos
Centríolos , MicroRNAs , Centríolos/metabolismo , MicroRNAs/genética , Proteínas/metabolismo , Epitélio/metabolismo , RNA Mensageiro/metabolismo
6.
Int J Biol Macromol ; 242(Pt 2): 124943, 2023 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-37210051

RESUMO

Biodegradable polylactide/poly(butylene adipate-co-terephthalate) (PLA/PBAT) blends have been widely utilized as packaging materials. However, it is urgent to develop a biocompatibilizer to improve the interfacial interaction of the biodegradable immiscible polymer blends in practice. In this paper, a novel type of hyperbranched polysiloxane (HBPSi) with terminal methoxy groups was synthesized and then utilized to functionalize lignin through a hydrosilation reaction. The HBPSi modified lignin (lignin@HBPSi) was incorporated into immiscible PLA/PBAT blends to serve as a biocompatibilizer. The lignin@HBPSi was uniformly dispersed in the PLA/PBAT matrix with improved interfacial compatibility. Dynamic rheological results revealed that the addition of lignin@HBPSi reduced the complex viscosity, improving the processing ability of the PLA/PBAT composite. The PLA/PBAT composite containing 5 wt% lignin@HBPSi had a superior toughness with an elongation at break of 300.2 % and a slight enhancement in tensile stress (34.47 MPa). In addition, the presence of lignin@HBPSi contributed to blocking ultraviolet rays in the full ultraviolet band. This work provides a feasible way to develop highly ductile PLA/PBAT/lignin composites with good UV-shielding properties for the packaging applications.


Assuntos
Lignina , Siloxanas , Raios Ultravioleta , Poliésteres , Polímeros , Adipatos
7.
Bioresour Technol ; 380: 129064, 2023 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-37068526

RESUMO

Effectively reduce antibiotic resistance genes (ARGs) in ectopic fermentation system (EFS) is essential for practical production. In this study, three experiments were performed to explore how to remove ARGs in EFS effectively. Results demonstrated that ARGs were easily enriched in rice-husk-sawdust padding; simultaneous addition of laccase and cellulase suppressed the ARGs, mainly by increasing soluble carbohydrate concentration and promoting humic acid concentration; addition of corn stalks into rice-husk-sawdust decreased the abundance of ARGs by improving the carbon source structure and enhancing cellulase activity. In conclusion, the present study provides a guidance to reduce the threat of ARGs in EFS, which paved a potential pathway to safely utilize manure resources.


Assuntos
Antibacterianos , Celulases , Antibacterianos/farmacologia , Genes Bacterianos , Carbono , Fermentação , Resistência Microbiana a Medicamentos/genética , Esterco
8.
Int J Biol Macromol ; 236: 123947, 2023 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-36898460

RESUMO

The inherent shortcomings such as flammability, brittleness, and low crystallinity limit the broad applications of poly(lactic acid) (PLA). To improve the fire resistance and mechanical properties of PLA, a chitosan-based core-shell flame retardant additive (APBA@PA@CS) was prepared for PLA via the self-assembly of interionic interactions among chitosan (CS), phytic acid (PA), and 3-aminophenyl boronic acid (APBA). The peak heat release rate (pHRR) and total heat release rate (THR) of PLA composite containing 3 wt% APBA@PA@CS decreased from 460.1 kW/m2 and 75.8 MJ/m2 to 419.0 kW/m2 and 53.1 MJ/m2, respectively. The presence of APBA@PA@CS contributed to the formation of a high-quality char layer rich in phosphorus and boron in the condensed phase and released non-flammable gases in the gas phase to hinder the exchange of heat and O2, thereby having a synergistic flame retardant effect. Meanwhile, the tensile strength, elongation at break, impact strength, and crystallinity of PLA/APBA@PA@CS were increased by 3.7 %, 17.4 %, 5.3 %, and 55.2 %, respectively. This study provides a feasible route to construct a chitosan-based N/B/P tri-element hybrid to improve the fire safety performance and mechanical properties of PLA biocomposites.


Assuntos
Quitosana , Retardadores de Chama , Poliésteres , Temperatura Alta , Ácido Fítico
9.
Polymers (Basel) ; 14(23)2022 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-36501647

RESUMO

Biodegradable polylactide (PLA) has been widely utilized in people's daily lives. In order to improve the fire safety of PLA, ammonium polyphosphate (APP) was self-assembled onto the surface of serpentine Ni3Si2O5(OH)4 through the electrostatic method, followed by mixing with PLA by melt compounding. The APP-modified serpentine (serpentine@APP) dispersed uniformly in the PLA matrix. Compared with pure PLA, the PLA composite with 2 wt% serpentine@APP reduced the peak heat release rate (pHRR) and total heat release (THR) by 43.9% and 16.3%, respectively. The combination of APP and serpentine exhibited suitable synergistic flame-retardant effects on the fire safety enhancement of PLA. In addition, the dynamical rheological tests revealed that the presence of APP and serpentine could reduce the viscosity of PLA composites. The plasticizing effects of APP and serpentine benefited the processing of PLA. The mechanical properties of PLA/serpentine@APP maintained suitable performance as pure PLA. This study provided a feasible way to enhance the fire safety of PLA without sacrificing its mechanical properties.

10.
Adv Healthc Mater ; 11(19): e2200859, 2022 10.
Artigo em Inglês | MEDLINE | ID: mdl-35906730

RESUMO

Although combination drugs and P-glycoprotein inhibitors are the main methods to solve multidrug resistance, these methods ignore the pathological structure of drug-resistant cells and extremely limit curative effect. Herein, a new paradigm of reversing multidrug resistance with abnormal expression of cholesterol as the target is proposed, which uses the cascade catalysis of "natural enzyme" cholesterol oxidase (COD) and "nanoenzyme" Cu2+ -modified zirconium-based metal-organic framework (ZrMOF(Cu)) to convert cholesterol into the highly cytotoxic hydroxyl radicals. The doxorubicin (DOX)-loaded nanoparticles (DOX@COD-MOF) can significantly reduce the cholesterol content of cancer cells via COD, which decrease the rigidity of drug resistant cancer cell membranes and restore the sensitivity of multidrug-resistant cells to DOX. Afterward, DOX@COD-MOF is encapsulated by cancer cell membranes (CCM) to construct a bionic "dual enzyme catalytic cascade nanoreactor" (DOX@COD-MOF@CCM). Such a rational design presents a preferential accumulation tendency to tumor sites due to the homologous targeting mechanism of CCM, and affords 94.4% in tumor growth suppression without systemic toxicity in vivo. This work aims to achieve the therapeutic purpose of high efficiency and low toxicity. It has the characteristics of "converting enemy into friend, " and opens up a promising way for effectively reversing multidrug resistance of tumors.


Assuntos
Estruturas Metalorgânicas , Nanopartículas , Neoplasias , Subfamília B de Transportador de Cassetes de Ligação de ATP , Catálise , Linhagem Celular Tumoral , Colesterol , Colesterol Oxidase/metabolismo , Colesterol Oxidase/farmacologia , Doxorrubicina/química , Resistência a Múltiplos Medicamentos , Resistencia a Medicamentos Antineoplásicos , Humanos , Estruturas Metalorgânicas/química , Estruturas Metalorgânicas/farmacologia , Nanopartículas/química , Neoplasias/tratamento farmacológico , Zircônio
11.
J Nanobiotechnology ; 20(1): 209, 2022 May 02.
Artigo em Inglês | MEDLINE | ID: mdl-35501796

RESUMO

Multidrug resistance is still a major obstacle to cancer treatment. The most studies are to inhibit the activity of the drug transporter P-glycoprotein (P-gp), but the effect is not ideal. Herein, a nanosystem was built based on cascade catalytic consumption of cholesterol. Cholesterol oxidase (natural enzyme, COD) was immobilized on the carrier (NH2-MIL-88B, MOF) through amide reaction, COD catalyzed the consumption of cholesterol, the reaction product H2O2 was further produced by the MOF with its peroxidase-like activity to produce hydroxyl radicals (•OH) with killing effect. Due to the high expression of CD44 receptor on the surface of tumor cells, we encapsulated chondroitin sulfate gel shell (CS-shell) with CD44 targeting and apoptosis promoting effect on the surface of DOX@MOF-COD nanoparticles, which can accurately and efficiently deliver the drugs to the tumor site and improve the effect of reversing drug resistance. Taking drug-resistant cell membrane as "breakthrough", this paper will provide a new idea for reversing multidrug resistance of tumor.


Assuntos
Peróxido de Hidrogênio , Neoplasias , Catálise , Colesterol , Resistência a Múltiplos Medicamentos , Humanos , Neoplasias/tratamento farmacológico
12.
Sensors (Basel) ; 22(3)2022 Jan 18.
Artigo em Inglês | MEDLINE | ID: mdl-35161450

RESUMO

Infrared thermography (IRT) imaging technology, as a convenient, efficient, and contactless temperature measurement technology, has been widely applied to animal production. In this review, we systematically summarized the principles and influencing parameters of IRT imaging technology. In addition, we also summed up recent advances of IRT imaging technology in monitoring the temperature of animal surfaces and core anatomical areas, diagnosing early disease and inflammation, monitoring animal stress levels, identifying estrus and ovulation, and diagnosing pregnancy and animal welfare. Finally, we made prospective forecast for future research directions, offering more theoretical references for related research in this field.


Assuntos
Raios Infravermelhos , Termografia , Animais , Temperatura Corporal , Feminino , Estudos Prospectivos , Tecnologia
13.
Int J Biol Macromol ; 188: 323-332, 2021 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-34375661

RESUMO

The demand for biodegradable and renewable UV-shielding materials is ever increasing due to the rising concern for the environment. In this paper, biobased lignin was functionalized by polyhedral oligomeric silsesquioxane (POSS) with an epoxy substituent. Then the POSS decorated lignin (lignin-POSS) was mixed with polylactide (PLA) to act as UV-shielding filler by melt compounding. The SEM observation revealed that the presence of POSS contributed to improving the homogeneous dispersion of lignin-POSS in the PLA matrix with good compatibility when the content of lignin-POSS was lower than 5 wt%. The synergistic effects of lignin and POSS endowed PLA composite films with a good balance of UV-shielding ability and transparency in the visible light region. With the addition of 5 wt% lignin-POSS, the PLA composite film absorbed almost all UV irradiation across the entire UV spectrum. In addition, the presence of lignin-POSS could serve as a nucleating agent to increase the degree of crystallinity of PLA. The dynamical rheological tests revealed that the lignin-POSSS reduced the complex viscosity and storage modulus of PLA composites, improving the flowability of PLA composites. This work presents a viable pathway to prepare biodegradable and renewable UV-shielding materials for potential packaging applications.


Assuntos
Plásticos Biodegradáveis/química , Lignina/química , Poliésteres/química , Lignina/ultraestrutura , Compostos de Organossilício/química , Raios Ultravioleta
14.
Nanomedicine ; 35: 102307, 2021 07.
Artigo em Inglês | MEDLINE | ID: mdl-32987192

RESUMO

Recently, studies showed that the drug-resistant cell membranes have formed high-density lipid rafts regions; traditional targeted drug delivery systems can hardly break through the hard shell and deliver drugs to drug-resistant cells. Here, α-tocopherol polyethylene glycol 2000 succinate (TPGS2k) was successfully synthesized and used to modify poly (lactic-glycolic acid) nanoparticles co-loaded with doxorubicin (DOX) and simvastatin (SV) (SV/DOX@TPGS2k-PLGA NPs). The purpose of this study is to explore the synergistic effect between SV consuming cholesterol in lipid rafts and directly down-regulating P-gp expression on the intracellular drugs retention. The research highlights these nanoparticles interrupted lipid rafts (cholesterol-rich domains, where P-gp is often located), which inhibited drug efflux by down-regulating P-gp, promoted the mitochondria apoptosis and made SW620/AD300 cells (DOX-resistant colon cancer cell line) re-sensitized to DOX. Therefore, the carrier can become a promising SV-based nano-delivery system with depleting cholesterol in lipid rafts to reverse drug resistance.


Assuntos
Doxorrubicina , Portadores de Fármacos , Resistencia a Medicamentos Antineoplásicos/efeitos dos fármacos , Lipídeos de Membrana/metabolismo , Microdomínios da Membrana/metabolismo , Nanopartículas , Sinvastatina , Linhagem Celular Tumoral , Doxorrubicina/química , Doxorrubicina/farmacologia , Portadores de Fármacos/síntese química , Portadores de Fármacos/química , Portadores de Fármacos/farmacologia , Humanos , Nanopartículas/química , Nanopartículas/uso terapêutico , Polietilenoglicóis/química , Polietilenoglicóis/farmacologia , Copolímero de Ácido Poliláctico e Ácido Poliglicólico/química , Copolímero de Ácido Poliláctico e Ácido Poliglicólico/farmacologia , Sinvastatina/química , Sinvastatina/farmacologia , alfa-Tocoferol/química , alfa-Tocoferol/farmacologia
15.
Front Immunol ; 11: 547144, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33072088

RESUMO

Porcine reproductive and respiratory syndrome (PRRS) caused by a single-stranded RNA virus (PRRSV) is a highly infectious respiratory disease and leads to huge economic losses to the swine industry worldwide. To investigate the role of miRNAs in the infection and lung injury induced by PRRSV, the differentially expressed miRNAs (DE-miRs) were isolated from PRRSV-2 infected/mock-infected PAMs of Meishan, Landrace, Pietrain, and Qingping pigs at 9, 36, and 60 hpi. Mir-331-3p was the only common DE-miR in each set of miRNA expression profile at 36 hpi. Mir-210 was one of 7 common DE-miRs between PRRSV infected and mock-infected PAMs of Meishan, Pietrain, and Qingping pigs at 60 hpi. Mir-331-3p/mir-210 could target PRRSV-2 ORF1b, bind and downregulate porcine TNF-α/STAT1 expression, and inhibit PRRSV-2 replication, respectively. Furthermore, STAT1 and TNF-α could mediate the transcriptional activation of MCP-1, VCAM-1, and ICAM-1. STAT1 could also upregulate the expression of TNF-α by binding to its promoter region. In vivo, pEGFP-N1-mir-331-3p could significantly reduce viral replication and pathological changes in PRRSV-2 infected piglets. Taken together, Mir-331-3p/mir-210 have significant roles in the infection and lung injury caused by PRRSV-2, and they may be promising therapeutic targets for PRRS and lung injury/inflammation.


Assuntos
Pulmão/metabolismo , Pulmão/virologia , MicroRNAs/genética , Síndrome Respiratória e Reprodutiva Suína/genética , Síndrome Respiratória e Reprodutiva Suína/virologia , Vírus da Síndrome Respiratória e Reprodutiva Suína/fisiologia , Replicação Viral , Animais , Biomarcadores , Biópsia , Linhagem Celular , Regulação da Expressão Gênica , Interações Hospedeiro-Patógeno , Pulmão/patologia , Vírus da Síndrome Respiratória e Reprodutiva Suína/classificação , Interferência de RNA , Fator de Transcrição STAT1/genética , Suínos , Fator de Necrose Tumoral alfa/genética , Replicação Viral/genética
16.
J Mater Chem B ; 2020 Sep 18.
Artigo em Inglês | MEDLINE | ID: mdl-32945310

RESUMO

In tumor immunotherapy, Treg cells are immunosuppressive cells. In general, the main strategy of chemo immune-therapy for Treg cells is to eliminate them using chemotherapy drugs combined with immune checkpoint inhibitors. However, the dead Treg cells still exert immunosuppressive effects via the nucleoside adenosine pathway. To improve immunosuppression, we designed a nanosystem to deliver synthetic chemotherapeutics and immune activators. The homemade curcumin analog (CA) was encapsulated by α-lactalbumin (α-LA), and the Treg cell specific antibody (mAb), as a therapeutic agent, was linked to the drug-loaded protein via matrix metalloproteinase-responded peptide (P). After the cleavage peptide responded to matrix metalloproteinase (MMP-2), the CA@α-LA-P-mAb nanoparticles were separated into CA@α-LA and antibody, which can specifically enter cancer cells and Treg cells via membrane fusion and Nrp-1 receptors, respectively. Finally, we found that CA can not only lead to cell death by the chondriosome apoptosis approach but also reduce the production of Treg cells by inhibiting the expression of foxp3 (a key transcription factor of Treg cells). In addition, specific antibodies can improve the immunosuppression of existing Treg cells. The combined effect of CA and antibodies amplifies the role of chemotherapy in metastatic breast cancer.

17.
J Mater Chem B ; 7(31): 4784-4793, 2019 08 07.
Artigo em Inglês | MEDLINE | ID: mdl-31389949

RESUMO

An ideal cancer therapeutic strategy should not only reverse multidrug resistance (MDR), but also prevent cancer metastasis. In this study, bovine serum albumin (BSA) was hybridized with Mn2+via biomineralization to develop a hybrid protein oxygen nanocarrier, which contained doxorubicin (DOX) and small interfering RNA (siRNA). The nanohybrid has the function of producing oxygen and chemotherapy synergistic gene therapy. FA-BSA-MnO2/DOX/siRNA was favorable for increasing the sensitivity of MCF-7/ADR cells to DOX. Moreover, FA-BSA-MnO2/DOX/siRNA NPs were also able to generate oxygen (O2) by reaction with endogenous hydrogen peroxide (H2O2) in tumor, thereby down-regulating the expression of hypoxia inducible factor-1α (HIF-1α), and then the expression of the vascular endothelial growth factor (VEGF) was down-regulated. At the same time, siRNA can directly or indirectly suppress the expression of the VEGF and HIF-1α. Therefore, the combination of two pathways and the chemo-gene therapy strategy can interactively overcome tumor hypoxia-associated MDR and metastasis, which will enhance therapeutic efficacy in the future.


Assuntos
Antineoplásicos/uso terapêutico , Neoplasias da Mama/tratamento farmacológico , Portadores de Fármacos/química , Resistência a Múltiplos Medicamentos/efeitos dos fármacos , Resistencia a Medicamentos Antineoplásicos/efeitos dos fármacos , Nanopartículas Metálicas/química , Animais , Bovinos , Movimento Celular/efeitos dos fármacos , Regulação para Baixo/efeitos dos fármacos , Doxorrubicina/uso terapêutico , Portadores de Fármacos/toxicidade , Feminino , Ácido Fólico/química , Ácido Fólico/toxicidade , Humanos , Peróxido de Hidrogênio/química , Peróxido de Hidrogênio/metabolismo , Concentração de Íons de Hidrogênio , Subunidade alfa do Fator 1 Induzível por Hipóxia/metabolismo , Células MCF-7 , Compostos de Manganês/química , Nanopartículas Metálicas/toxicidade , Camundongos Endogâmicos BALB C , Metástase Neoplásica/prevenção & controle , Óxidos/química , Óxidos/toxicidade , Oxigênio/metabolismo , RNA Interferente Pequeno/uso terapêutico , Soroalbumina Bovina/química , Soroalbumina Bovina/toxicidade , Fator A de Crescimento do Endotélio Vascular/metabolismo
18.
Sci Rep ; 6: 20758, 2016 Feb 11.
Artigo em Inglês | MEDLINE | ID: mdl-26865000

RESUMO

Meishan boars are known for their early sexual maturity. However, they exhibit a significantly smaller testicular size and a reduced proportion of Sertoli cells and daily sperm production compared with Duroc boars. The testes of Duroc and Meishan boars at 20, 75 and 270 days of age were used for histological and transcriptome analyses. Haematoxylin-eosin staining was conducted to observe histological structure of the testes in Duroc and Meishan boars at different ages. Although spermatogenesis occurred prior to 75 days in Meishan boars, the number of spermatogonia and Sertoli cells in Meishan boars were less than in Duroc boars at adulthood. The diameters of the seminiferous tubules of the testes differed significantly during the initiation of development of the seminiferous tubules between the two breeds. We obtained differentially expressed functional genes and analysed seven pathways involved in male sexual maturity and spermatogenesis using RNA-seq. We also detected four main alternative splicing events and many single nucleotide polymorphisms from testes. Eight functionally important genes were validated by qPCR, and Neurotrophin 3 was subjected to quantification and cellular localization analysis. Our study provides the first transcriptome evidence for the differences in sexual function development between Meishan and Duroc boars.


Assuntos
Túbulos Seminíferos/metabolismo , Células de Sertoli/metabolismo , Maturidade Sexual/genética , Espermatogênese/genética , Espermatozoides/metabolismo , Transcriptoma , Animais , Cruzamento , Amarelo de Eosina-(YS) , Perfilação da Expressão Gênica , Regulação da Expressão Gênica no Desenvolvimento , Hematoxilina , Masculino , Neurotrofina 3/genética , Neurotrofina 3/metabolismo , Tamanho do Órgão , Polimorfismo de Nucleotídeo Único , Túbulos Seminíferos/ultraestrutura , Análise de Sequência de RNA , Células de Sertoli/ultraestrutura , Especificidade da Espécie , Contagem de Espermatozoides , Espermatozoides/ultraestrutura , Suínos
19.
J Res Med Sci ; 21: 99, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-28163745

RESUMO

BACKGROUND: It is intriguing and imperative that the comparison of the iron preparations in hemodialysis (HD) patients. This study aimed to observe the short-term efficacy of parenteral iron sucrose and ferric chloride in HD patients. MATERIALS AND METHODS: This was a consecutive 10-week single-blind study in Taiwan. An intravenous iron supplement of 100 mg/week was administered as an infusion in 100 ml of normal saline, until a total dose of 1000 mg was achieved. The primary outcome was evaluated by the changes in serum hematocrit (Hct) levels. The changes in serum Hct and iron indices were evaluated every 2 weeks for 10 weeks. The results were collected from 21 April to 4 July 2013. RESULTS: A total of 56 HD patients completed the study. Subjects were randomized into an iron sucrose group (26 patients) and a ferric chloride group (30 patients). Between the two treatment groups, there were no statistically significant differences in the change in serum Hct, ferritin, iron, or total iron binding capacity (P > 0.05). In the iron sucrose group, the increase in Hct levels was statistically significant at weeks 4, 8, and 10. In the ferric chloride group, the increase in Hct levels was statistically significant at week 8. No obvious major side effects were observed in both groups. CONCLUSION: In the study subjects, parenteral iron sucrose was as effective and safe as ferric chloride for treating anemia in HD patients.

20.
Complement Ther Med ; 23(3): 363-71, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-26051571

RESUMO

BACKGROUND: Complementary and alternative medicine such as traditional Chinese medicine (TCM) is now frequently used combined with Western medicine for treatment in chronic kidney disease (CKD). OBJECTIVE: We designed an open-label trial to investigate the safety and potential therapeutic effects of Ren Shen Yang Rong Tang (R-S-Y-R-T) in hemodialysis (HD) patients. METHODS: The experimental group was treated with additional R-S-Y-R-T combined with routine western medicine, while the control group was treated only with routine western medicine. The duration of study was 6 months. Primary outcomes were to evaluate the changes in serum hematocrit and albumin levels. Secondary outcomes including blood inflammatory markers (c-reactive protein [CRP], interleukin-6 [IL-6], and tumor necrosis factor-α [TNF-α]) were checked. Finally we also followed up the change of quality of life (QOL) in our subjects. RESULTS: Sixty nine respondents were enrolled in this trial. Finally a total of 59 patients (27 R-S-Y-R-T group, 32 control group) completed the 6-month follow-up. Primary outcomes showed no significant statistical change of hematocrit in either 2 group (P>0.05). But the R-S-Y-R-T group had a statistical increase in serum albumin (P<0.05). Secondary outcomes were that both TNF-α (P=0.003) and IL-6 (P=0.001) showed evident decrease in the R-S-Y-R-T group. CRP was identified without statistical difference in both groups (P=0.226). The R-S-Y-R-T group also had a significant improvement in QOL (P<0.05). CONCLUSIONS: Our study suggests that R-S-Y-R-T could decrease chronic inflammation and increase the life quality in HD patients. Further larger clinical trial of long-term treatment with R-S-Y-R-T is necessary for evaluating treatment use.


Assuntos
Medicamentos de Ervas Chinesas/uso terapêutico , Inflamação/terapia , Medicina Tradicional Chinesa , Diálise Renal/efeitos adversos , Idoso , Pressão Sanguínea , Proteína C-Reativa/análise , Medicamentos de Ervas Chinesas/efeitos adversos , Feminino , Humanos , Inflamação/epidemiologia , Interleucina-6/sangue , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Qualidade de Vida , Fator de Necrose Tumoral alfa/sangue
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA