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1.
Genome Res ; 32(3): 534-544, 2022 03.
Artículo en Inglés | MEDLINE | ID: mdl-35105668

RESUMEN

Enhancer-promoter communication is known to regulate spatiotemporal dynamics of gene expression. Several methods are available to capture enhancer-promoter interactions, but they either require large amounts of starting materials and are costly, or provide a relative low resolution in chromatin contact maps. Here, we present nicking enzyme-assisted open chromatin interaction capture (NicE-C), a method that leverages nicking enzyme-mediated open chromatin profiling and chromosome conformation capture to enable robust and cost-effective detection of open chromatin interactions at high resolution, especially enhancer-promoter interactions. Using TNF stimulation and mouse kidney aging as models, we applied NicE-C to reveal characteristics of dynamic enhancer-promoter interactions.


Asunto(s)
Cromatina , Elementos de Facilitación Genéticos , Animales , Cromatina/genética , Cromosomas/genética , Ratones , Regiones Promotoras Genéticas
2.
J Am Chem Soc ; 2024 Apr 11.
Artículo en Inglés | MEDLINE | ID: mdl-38602146

RESUMEN

Multidrug resistance is the main obstacle to cancer chemotherapy. Overexpression of drug efflux pumps causes excessive drug efflux from cancer cells, ultimately leading to drug resistance. Hereby, we raise an effective strategy to overcome multidrug resistance using a synergistic combination of membranolytic antitumor ß-peptide polymer and chemotherapy drugs. This membrane-active ß-peptide polymer promotes the transmembrane transport of chemotherapeutic drugs by increasing membrane permeability and enhances the activity of chemotherapy drugs against multidrug-resistant cancer cells. As a proof-of-concept demonstration, the synergistic combination of ß-peptide polymer and doxorubicin (DOX) is substantially more effective than DOX alone against drug-resistant cancer both in vitro and in vivo. Notably, the synergistic combination maintains a potent anticancer activity after continuous use. Collectively, this combination therapy using membrane lytic ß-peptide polymer appears to be an effective strategy to reverse anticancer drug resistance.

3.
Echocardiography ; 41(3): e15762, 2024 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-38520248

RESUMEN

Cardiac contractility modulation (CCM) is a novel device-based therapy used to treat patients with heart failure with reduced ejection fraction (HFrEF). In both randomized clinical trials and real-life studies, CCM has been shown to improve exercise tolerance and quality of life, reverse left ventricular remodeling, and reduce hospitalization in patients with HFrEF. In this case report, we describe for the first time the use of CCM combined with left bundle branch pacing (LBBP) cardiac resynchronization therapy pacemaker (CRT-P) implantation therapy in a female with a 22-year history of non-ischemic dilated cardiomyopathy. With the optimal medical therapy and cardiac resynchronization therapy (CRT) strategies, the patient's quality of life initially recovered to some extent, but began to deteriorate in the past year. Additionally, heart transplantation was not considered due to economic reasons and late stage systolic heart failure. This is the first case of CCM implantation in Fujian Province and the first report of a combined CCM and left bundle branch pacing CRT-P implantation strategy in a patient with non-ischemic etiology dilated cardiomyopathy in China.


Asunto(s)
Terapia de Resincronización Cardíaca , Cardiomiopatía Dilatada , Insuficiencia Cardíaca , Marcapaso Artificial , Disfunción Ventricular Izquierda , Humanos , Femenino , Insuficiencia Cardíaca/terapia , Calidad de Vida , Cardiomiopatía Dilatada/complicaciones , Cardiomiopatía Dilatada/terapia , Volumen Sistólico , Resultado del Tratamiento , Disfunción Ventricular Izquierda/terapia , Electrocardiografía , Función Ventricular Izquierda
4.
J Am Chem Soc ; 145(47): 25753-25765, 2023 11 29.
Artículo en Inglés | MEDLINE | ID: mdl-37966432

RESUMEN

Invasive fungal infections, including meningitis, cause a high mortality rate due to few available antifungal drugs and frequently associated side effects and quick emergence of drug-resistant fungi. The restrictive permeability of the blood-brain barrier (BBB) further limits the efficacy of antifungal agents substantially in treating meningitis. Hereby, we design and synthesize guanidinium-functionalized poly(2-oxazoline)s by mimicking cell-penetrating peptides. The optimal polymer, PGMeOx10 bearing a methylene spacer arm, displays potent activities against the drug-resistant fungi and biofilm, negligible toxicity, and insusceptibility to antimicrobial resistance. Moreover, PGMeOx10 can break BBB retractions to exert promising antifungal functions in the brain. PGMeOx10 demonstrates potent in vivo antifungal therapeutic efficacy in mouse models including skin infection, systemic infections, and meningitis. PGMeOx10 effectively rescues infected mice and reduces fungal burden and inflammation in the brain. These results and the excellent biosafety of poly(2-oxazoline)s indicate the effectiveness and potential of our strategy to design promising antifungal agents in treating systemic infections and meningitis.


Asunto(s)
Antifúngicos , Meningitis , Animales , Ratones , Antifúngicos/farmacología , Antifúngicos/uso terapéutico , Antifúngicos/química , Barrera Hematoencefálica , Hongos , Péptidos/farmacología , Meningitis/tratamiento farmacológico , Pruebas de Sensibilidad Microbiana
5.
Microb Pathog ; 184: 106362, 2023 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-37741305

RESUMEN

BACKGROUND: Previous studies have shown that sepsis is implicated in a reduction in the number and function of CD4+ T cells. TCF7 and LEF-1 facilitate early T cell development and lineage selection of CD4+ T cells. However, the function and mechanism of TCF7 and LEF-1 in sepsis are uncharacterized. This study intended to delineate effect of TCF7 and LEF-1 on sepsis and the impact on proliferation of CD4+ T cells in sepsis. METHODS: A mouse sepsis model was constructed by cecal ligation and puncture (CLP) method. Expression of TCF7 and LEF-1 in sepsis was investigated using bioinformatics analysis and molecular experiments. We then constructed TCF7 and LEF-1 overexpression cell lines to investigate their effects on proliferation, apoptosis, effector activation, and immunosuppressive molecules of CD4+ T cells in sepsis. RESULTS: TCF7 and LEF-1 were downregulated in sepsis. As the duration of sepsis induction increased, the levels of TCF7 and LEF-1 gradually decreased, as did the number of CD4+ T cells. Cell experiments showed that overexpression of TCF7 and LEF-1 enhanced proliferation and effector activation of CD4+ T cells, reduced apoptosis, decreased PD-1 and LAG3 expression, and promoted immune response in sepsis. CONCLUSION: In conclusion, this study confirmed that downregulation of TCF7 and LEF-1 expression in sepsis inhibited proliferation of CD4+ T cells, leading to immune suppression. This finding suggested that TCF7 and LEF-1 were potential biological targets for sepsis and indicated that immunotherapy aimed at improving CD4+ T cell proliferation may be a new strategy for immune therapy in sepsis patients.


Asunto(s)
Sepsis , Linfocitos T , Animales , Humanos , Ratones , Linfocitos T CD4-Positivos , Proliferación Celular , Regulación hacia Abajo , Ratones Endogámicos C57BL , Sepsis/metabolismo , Factor 1 de Transcripción de Linfocitos T/genética , Factor 1 de Transcripción de Linfocitos T/metabolismo
6.
J Am Chem Soc ; 144(16): 7283-7294, 2022 04 27.
Artículo en Inglés | MEDLINE | ID: mdl-35420800

RESUMEN

Multidrug resistance to chemotherapeutic drugs is one of the major causes for the failure of cancer treatment. Therefore, there is an urgent need to develop anticancer agents that can combat multidrug-resistant cancers effectively and mitigate drug resistance. Here, we report a rational design of anticancer heterochiral ß-peptide polymers as synthetic mimics of host defense peptides to combat multidrug-resistant cancers. The optimal polymer shows potent and broad-spectrum anticancer activities against multidrug-resistant cancer cells and is insusceptible to anticancer drug resistance owing to its membrane-damaging mechanism. The in vivo study indicates that the optimal polymer efficiently inhibits the growth and distant transfer of solid tumors and the metastasis and seeding of circulating tumor cells. Moreover, the polymer shows excellent biocompatibility during anticancer treatment on animals. In addition, the ß-peptide polymers address those prominent shortcomings of anticancer peptides and have superior stability against proteolysis, easy synthesis in large scale, and low cost. Collectively, the structural diversity and superior anticancer performance of ß-peptide polymers imply an effective strategy in designing and finding anticancer agents to combat multidrug-resistant cancers effectively while mitigating drug resistance.


Asunto(s)
Antineoplásicos , Neoplasias , Animales , Péptidos Catiónicos Antimicrobianos , Antineoplásicos/química , Antineoplásicos/farmacología , Antineoplásicos/uso terapéutico , Resistencia a Múltiples Medicamentos , Resistencia a Antineoplásicos , Neoplasias/tratamiento farmacológico , Polímeros/química , Polímeros/farmacología
7.
Chemistry ; 28(65): e202202226, 2022 Nov 21.
Artículo en Inglés | MEDLINE | ID: mdl-35996361

RESUMEN

The high-mortality invasive fungal infections seriously threaten the lives of immunocompromised people. Host defense peptides and cell-penetrating peptides are representative membrane-active peptides with different functions. Among them, host defense peptides mimicking is a valid strategy in the design of synthetic antifungal agents. Despite the brilliance in the field of intracellular delivery, the potential of cell-penetrating peptides and their mimics for designing antifungal agents has been overlooked. In this concept article, we describe the structural design of synthetic antifungal polymers as mimics of host defense peptides, and highlight the effectiveness and potential of cell-penetrating peptide-inspired strategy in designing potent and selective antifungal polymeric agents. In addition, an outlook for further expanding the design horizons of antifungal polymers is also presented.


Asunto(s)
Antifúngicos , Péptidos de Penetración Celular , Humanos , Antifúngicos/farmacología , Antifúngicos/química , Pruebas de Sensibilidad Microbiana , Péptidos de Penetración Celular/química , Péptidos Catiónicos Antimicrobianos , Polímeros
8.
Clin J Sport Med ; 32(6): 623-626, 2022 11 01.
Artículo en Inglés | MEDLINE | ID: mdl-36315821

RESUMEN

OBJECTIVE: Visinin-like protein 1 (VILIP-1) is a neuron-specific calcium sensor protein rapidly released into blood after mild traumatic brain injury (mTBI) and may be a suitable biomarker for identification of sports-related concussion (SRC). The objective of the study is to test if quantification of a specific post-translationally modified (ubiquitinated) form of VILIP-1 (ubVILIP-1) from a fingerstick blood sample using a point of care (POC) lateral flow device (LFD) can be used to rapidly identify athletes with SRC. DESIGN: Prospective cohort study. SETTING: Side-line blood collection at football, soccer, and volleyball games/practices. PARTICIPANTS: Division I athletes with/without SRC. MAIN OUTCOME MEASURES: Blood ubVILIP-1 concentrations. RESULTS: Data collected over 2 athletic seasons from non-SRC athletes (controls) show a small but statistically significant elevation of ubVILIP-1 over an individual season for male athletes (P = 0.02) dependent on sport (P = 0.014) and no significant changes in ubVILIP-1 levels between seasons. For SRC athletes, the data show ubVILIP-1 levels substantially increase above baseline as soon as 30 minutes postdiagnosis with peak concentrations and times postinjury that vary based on injury severity. CONCLUSION: Results of the study suggest quantification of blood ubVILIP-1 levels measured using an LFD may provide an objective identification of athletes with SRC, setting the stage for further study with a larger number of SRC patients.


Asunto(s)
Traumatismos en Atletas , Conmoción Encefálica , Fútbol Americano , Fútbol , Voleibol , Humanos , Masculino , Atletas , Traumatismos en Atletas/diagnóstico , Conmoción Encefálica/diagnóstico , Fútbol Americano/lesiones , Sistemas de Atención de Punto , Pruebas en el Punto de Atención , Estudios Prospectivos , Fútbol/lesiones , Voleibol/lesiones
9.
Sensors (Basel) ; 21(21)2021 Nov 06.
Artículo en Inglés | MEDLINE | ID: mdl-34770693

RESUMEN

Phased array technology features rapid and directional scanning and has become a promising approach for remote sensing and wireless communication. In addition, element-level digitization has increased the feasibility of complicated signal processing and simultaneous multi-beamforming processes. However, the high cost and bulky characteristics of beam-steering systems have prevented their extensive application. In this paper, an X-band element-level digital phased array radar utilizing fully integrated complementary metal-oxide-semiconductor (CMOS) transceivers is proposed for achieving a low-cost and compact-size digital beamforming system. An 8-10 GHz transceiver system-on-chip (SoC) fabricated in 65 nm CMOS technology offers baseband filtering, frequency translation, and global clock synchronization through the proposed periodic pulse injection technique. A 16-element subarray module with an SoC integration, antenna-in-package, and tile array configuration achieves digital beamforming, back-end computing, and dc-dc conversion with a size of 317 × 149 × 74.6 mm3. A radar demonstrator with scalable subarray modules simultaneously realizes range sensing and azimuth recognition for pulsed radar configurations. Captured by the suggested software-defined pulsed radar, a complete range-azimuth figure with a 1 km maximum observation range can be displayed within 150 ms under the current implementation.

10.
Angew Chem Int Ed Engl ; 60(50): 26063-26071, 2021 12 06.
Artículo en Inglés | MEDLINE | ID: mdl-34569145

RESUMEN

We design the tetraalkylammonium carboxylate-initiated superfast polymerization on α-amino acid N-carboxyanhydrides (NCA) for efficient synthesis of polypeptides. Carboxylates, as a new class of initiator for NCA polymerization, can initiate the superfast NCA polymerization without the need of extra catalysts and the polymerization can be operated in open vessels at ambient condition without the use of glove box. Tetraalkylammonium carboxylate-initiated polymerization on NCA easily affords block copolymers with at least 15 blocks. Moreover, this method avoids tedious purification steps and enables direct polymerization on crude NCAs in aqueous environments to prepare polypeptides and one-pot synthesis of polypeptide nanoparticles. These advantages and the mild polymerization condition of tetraalkylammonium carboxylate-initiated NCA polymerization imply its great potential in functional exploration and application of polypeptides.

11.
Angew Chem Int Ed Engl ; 59(18): 7240-7244, 2020 04 27.
Artículo en Inglés | MEDLINE | ID: mdl-32061180

RESUMEN

Biocompatible and proteolysis-resistant poly-ß-peptides have broad applications and are dominantly synthesized via the harsh and water-sensitive ring-opening polymerization of ß-lactams in a glovebox or using a Schlenk line, catalyzed by the strong base LiN(SiMe3 )2 . We have developed a controllable and water-insensitive ring-opening polymerization of ß-amino acid N-thiocarboxyanhydrides (ß-NTAs) that can be operated in open vessels to prepare poly-ß-peptides in high yields, with diverse functional groups, variable chain length, narrow dispersity and defined architecture. These merits imply wide applications of ß-NTA polymerization and resulting poly-ß-peptides, which is validated by the finding of a HDP-mimicking poly-ß-peptide with potent antimicrobial activities. The living ß-NTA polymerization enables the controllable synthesis of random, block copolymers and easy tuning of both terminal groups of polypeptides, which facilitated the unravelling of the antibacterial mechanism using the fluorophore-labelled poly-ß-peptide.


Asunto(s)
Antibacterianos/farmacología , Bacillus subtilis/efectos de los fármacos , Péptidos/farmacología , Staphylococcus/efectos de los fármacos , Agua/química , Aminoácidos/química , Aminoácidos/farmacología , Anhídridos/química , Anhídridos/farmacología , Antibacterianos/síntesis química , Antibacterianos/química , Pruebas de Sensibilidad Microbiana , Estructura Molecular , Péptidos/síntesis química , Péptidos/química , Polimerizacion , Compuestos de Sulfhidrilo/química , Compuestos de Sulfhidrilo/farmacología
12.
J Sci Food Agric ; 99(1): 100-108, 2019 Jan 15.
Artículo en Inglés | MEDLINE | ID: mdl-29797328

RESUMEN

BACKGROUND: Peptide absorption from the forestomach plays a vital role in protein nutrition of dairy cows. This study was conducted to investigate the mechanism of dipeptide absorption in the forestomach of dairy cows using isolated omasal epithelial cells (OECs) and ruminal epithelial cells (RECs). RESULTS: Compared with RECs, the OECs formed a less tight monolayer, but had greater ability to transport glycylsarcosine (Gly-Sar) (P < 0.05). The OEC monolayers were immunopositive for the antibodies of anti-junction proteins. Gly-Sar transport was significantly greater at 37 °C than that at 4 °C, with an optimal pH of 6.0-6.5, and was decreased significantly by diethylpyrocarbonate and dipeptide Met-Gly (P < 0.05). The apical-to-basolateral transport was significantly greater than basolateral-to-apical transport (P < 0.05). Knockdown of peptide transporter 1 (PepT1) resulted in less Gly-Sar uptake in OECs, whereas overexpression of PepT1 in OECs resulted in higher Gly-Sar uptake (P < 0.05). Additionally, the expression of PepT1 was upregulated by the treatment with various dipeptides (P < 0.05). CONCLUSION: The OECs have a greater ability to transport Gly-Sar than RECs do. Both passive and active routes are involved in the process of Gly-Sar absorption in the isolated cultured forestomach epithelial cells from dairy cows. © 2018 Society of Chemical Industry.


Asunto(s)
Bovinos/metabolismo , Dipéptidos/metabolismo , Células Epiteliales/metabolismo , Omaso/citología , Rumen/citología , Animales , Transporte Biológico , Células Cultivadas , Células Epiteliales/química , Concentración de Iones de Hidrógeno , Omaso/química , Omaso/metabolismo , Rumen/química , Rumen/metabolismo
13.
Arch Anim Nutr ; 73(4): 324-337, 2019 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-31192701

RESUMEN

This experiment was conducted to evaluate the effects of different sources and levels of trace elements on growth performance, carcass composition and mineral excretion levels of broilers. In a completely randomised experimental design, 900 one-day-old male Ross-308 broilers were assigned to 5 treatments, with 6 replicates of 30 birds each. The control group (CITE) was fed with a basal diet containing regular inclusion levels of inorganic trace elements. Treatment groups were supplied with reduced levels (30% and 50% of the regular level) of inorganic (ITE) or organic trace elements (OTE), respectively. Groups 50% ITE, 30% OTE and 50% OTE diets had equivalent average daily gain (ADG), average daily feed intake (ADFI), feed to gain ratio (F/G ratio) and mortality rate compared with group CITE in any phase. However, compared with group CITE chicks in group 30% ITE have lower ADG and ADFI and higher F/G ratio. The carcass yields were not affected by dietary treatments. Compared with group CITE, in groups 30% ITE, 50% ITE, 30% OTE and 50% OTE the shear force values of the breast muscle were only 71.8%, 83.4%, 63.5% and 59.4% (p < 0.05), respectively. Birds received diets containing reduced levels of trace elements had diminished excretions of Mn and Zn throughout the entire period (p < 0.01). In conclusion, the reduced supplementation of trace elements had no or slightly negative impact on growth performance, carcass yield and meat quality, but decreased faecal mineral excretion. Moreover, the trace element supply as OTE played a limited role on performance and excretion and was only partly beneficial for animal performance in case the trace element supply was reduced to 30%.


Asunto(s)
Pollos/fisiología , Dieta/veterinaria , Eliminación Intestinal , Minerales/metabolismo , Oligoelementos/metabolismo , Alimentación Animal/análisis , Fenómenos Fisiológicos Nutricionales de los Animales/efectos de los fármacos , Animales , Pollos/crecimiento & desarrollo , Cobre/administración & dosificación , Cobre/química , Cobre/metabolismo , Suplementos Dietéticos/análisis , Relación Dosis-Respuesta a Droga , Heces/química , Hierro/administración & dosificación , Hierro/química , Hierro/metabolismo , Masculino , Manganeso/administración & dosificación , Manganeso/química , Manganeso/metabolismo , Carne/análisis , Distribución Aleatoria , Oligoelementos/administración & dosificación , Zinc/administración & dosificación , Zinc/química , Zinc/metabolismo
14.
Water Sci Technol ; 79(6): 1184-1194, 2019 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-31070598

RESUMEN

In this study, Eriochrome Black T (EBT) in water was decolorized by means of argon atmospheric pressure plasma jet (APPJ), which showed great decolorization performance. The results showed that the relatively high decolorization rate (approximately 80%) was obtained after plasma treatment for 6 min. Changes to some reactive oxygen and nitrogen species (RONS) in the liquid phase were detected. The contents of peroxide, HO·, O2 -·, and NO· in the plasma-treated EBT solution were much less than those in the activated water. The roles of H2O2 and HO· in the decolorization of EBT solution were explored by evaluating the effects of their scavengers, and by exploring the direct effect of H2O2. The results indicated that reactive oxygen species (ROS), especially HO· and O2 -·, played significant roles in the decolorization of the EBT solution. Analysis of degradation by-products indicated that plasma discharge could destroy the azo bond first and gradually break the aromatic rings of EBT molecules into small molecular compounds.


Asunto(s)
Presión Atmosférica , Compuestos Azo/química , Peróxido de Hidrógeno , Contaminantes Químicos del Agua/química , Purificación del Agua/métodos , Compuestos Azo/análisis , Nitrógeno , Contaminantes Químicos del Agua/análisis
15.
Cancer Invest ; 35(5): 289-300, 2017 May 28.
Artículo en Inglés | MEDLINE | ID: mdl-28368679

RESUMEN

Although diagnosis and treatment of gastric cancer have improved, the prognosis of patients remains poor. The majority of patients should be treated with chemotherapy or other follow-up treatment. However, the drug resistance of chemotherapy and heterogeneity of tumor itself lead to differences of sensitivity of chemotherapy drugs for different patients. Therefore, it is mandatory to develop better methods of treatment for treatment of gastric cancer. Calycosin has been used in several types of cancer cells. Cisplatin, 5-fluorouracil (5-FU), and adriamycin (ADM) are most widely used drugs for chemotherapy, and they improve the overall survival of cancer patients. To study whether and how calycosin enhances their inhibition of gastric cancer cells, we detected the signaling pathway in which calycosin and cisplatin, 5-FU, and ADM play role in human gastric cells lines. We found that calycosin can enhance the suppression of cisplatin to gastric cell line by inhibiting the phosphorylation of protein kinase B (Akt). So, when cisplatin/5-FU/ADM is combined with calycosin, it can achieve better therapeutic effect in lower concentration.


Asunto(s)
Protocolos de Quimioterapia Combinada Antineoplásica/farmacología , Cisplatino/farmacología , Doxorrubicina/farmacología , Fluorouracilo/farmacología , Isoflavonas/farmacología , Inhibidores de Proteínas Quinasas/farmacología , Proteínas Proto-Oncogénicas c-akt/antagonistas & inhibidores , Transducción de Señal/efectos de los fármacos , Neoplasias Gástricas/tratamiento farmacológico , Apoptosis/efectos de los fármacos , Proteínas Reguladoras de la Apoptosis/metabolismo , Proteínas de Ciclo Celular/metabolismo , Línea Celular Tumoral , Proliferación Celular/efectos de los fármacos , Relación Dosis-Respuesta a Droga , Resistencia a Antineoplásicos , Activación Enzimática , Humanos , Fosforilación , Proteínas Proto-Oncogénicas c-akt/metabolismo , Interferencia de ARN , Neoplasias Gástricas/enzimología , Neoplasias Gástricas/genética , Neoplasias Gástricas/patología , Factores de Tiempo , Transfección
16.
Sydowia ; 69: 229-264, 2017.
Artículo en Inglés | MEDLINE | ID: mdl-29386695

RESUMEN

The present study introduces seven new species, one new combination, one new variety and several interesting taxonomical notes and/or geographical records. Most of the new taxa are Ascomycetes, but the study also includes a new variety of a Basidiomycete. Novel species include Gyromitra khanspurensis (Discinaceae, Pezizales, Pezizomycetes) from Pakistan growing near Cedrus deoadara and Paramyrothecium guiyangense and Paramyrothecium verruridum (Stachybotriaceae, Hypocreales, Sordariomycetes) both isolated from soil in China. New species from South Africa are Sclerostagonospora elegiae on culm litter of Elegia equisetacea, Sclerostagonospora fusiformis on culm litter of Thamnochortus spicigerus, Sclerostagonospora pinguis on culm litter of Cannomois virgata and Sclerostagonospora sulcata on culm litter of Ischyrolepis subverticellata (Phaeosphaeriaceae, Pleosporales, Dothideomycetes). Hapalocystis berkeleyi var. kickxii with its basionym Hypoxylon kickxii is shown to be a taxon on species level and thus recombined as Hapalocystis kickxii (Sydowiellaceae, Diaporthales, Sordariomycetes), and it is lecto- and epitypified. The new variety Pluteus romellii var. luteoalbus (Pluteaceae, Agaricales, Agaricomycetes) growing on a mossy fallen stem of a deciduous tree is described from Czech Republic. Cortinarius scaurocaninus (Cortinariaceae, Agaricales, Agaricomycetes) is new for Austria, Humicola grisea (Chaetomiaceae, Sordariales, Sordariomycetes) is an interesting new record for Chile. Two taxa are reported as new for Turkey: the lichenicolous fungus Opegrapha parasitica (Opegraphaceae, Arthoniales, Arthoniomycetes) growing partly immersed in the thallus of Aspicilia and the lichen Rinodina zwackhiana (Physciaceae, Teloschistales, Lecanoromycetes) from calcareous rock. Finally, Xerula strigosa (Physalacriaceae, Agaricales, Agaricomycetes), described from China, is confirmed to be present also in Pakistan.

17.
Macromol Biosci ; 24(2): e2300327, 2024 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-37714144

RESUMEN

The infections associated with implantable medical devices can greatly affect the therapeutic effect and impose a heavy financial burden. Therefore, it is of great significance to develop antimicrobial biomaterials for the prevention and mitigation of healthcare-associated infections. Here, a facile construction of antimicrobial surface via one-step co-deposition of peptide polymer and dopamine is reported. The co-deposition of antimicrobial peptide polymer DLL60 BLG40 with dopamine (DA) on the surface of thermoplastic polyurethane (TPU) provides peptide polymer-modified TPU surface (TPU-DLL60 BLG40 ). The antimicrobial test shows that the TPU-DLL60 BLG40 surfaces of the sheet and the catheter both exhibit potent killing of 99.9% of methicillin-resistant Staphylococcus aureus (MRSA) and Escherichia coli (E. coli). In addition, the TPU-DLL60 BLG40 surface also exhibits excellent biocompatibility. This one-step antimicrobial modification method is fast and efficient, implies promising application in surface antimicrobial modification of implantable biomaterials and medical devices.


Asunto(s)
Antiinfecciosos , Staphylococcus aureus Resistente a Meticilina , Polímeros/farmacología , Polímeros/química , Dopamina/farmacología , Escherichia coli , Péptidos/química , Materiales Biocompatibles/farmacología , Poliuretanos/farmacología , Poliuretanos/química
18.
ACS Infect Dis ; 10(4): 1370-1378, 2024 04 12.
Artículo en Inglés | MEDLINE | ID: mdl-38503263

RESUMEN

Sepsis is a severe syndrome characterized by organ dysfunction, resulting from a systemic imbalance in response to infection. PAK1 plays a critical role in various diseases. The present study aimed to explore and delineate the mechanism of PAK1 in inflammation induced by sepsis. Bioinformatics analysis was performed to assess PAK1, snail, and CXCL2 expression in the whole blood of septic patients and the pathways enriched with PAK1. To simulate the sepsis model, THP-1 cells were stimulated with lipopolysaccharide. Gene expression was evaluated using qRT-PCR, while cell viability was assessed using CCK-8 assay. Cell apoptosis was tested with flow cytometry. Expression of inflammatory factors in cells following different treatments was analyzed using the enzyme linked immunosorbent assay (ELISA). Dual-luciferase and chromatin immunoprecipitation assays were conducted to verify the binding relationship between PAK1 and the snail. Mouse models of cecal ligation and puncture were established, and hematoxylin and eosin staining and ELISA were employed to detect the infiltration levels of inflammatory cells and the expression of related protective factors in lung, liver, and kidney tissues. The results demonstrated upregulation of PAK1, snail, and CXCL2 in the whole blood of septic patients, with PAK1 being enriched in the chemokine-related pathway. Knockdown of PAK1 significantly promoted the apoptosis of LPS-stimulated THP-1 cells and inhibited the expression of inflammatory factors. PAK1 upregulated the expression of the snail, which in turn promoted the expression of CXCL2. Thus, PAK1 mediated the sepsis-induced inflammatory response through the snail/CXCL2 pathway. In conclusion, PAK1 played a role in promoting inflammation induced by sepsis through the snail/CXCL2 axis, thereby providing a potential therapeutic target for the management of sepsis.


Asunto(s)
Sepsis , Transducción de Señal , Ratones , Animales , Humanos , Inflamación , Apoptosis , Hígado/metabolismo , Quimiocina CXCL2/genética , Quimiocina CXCL2/metabolismo , Quinasas p21 Activadas/genética , Quinasas p21 Activadas/metabolismo
19.
Int J Biol Macromol ; 270(Pt 2): 132227, 2024 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-38734339

RESUMEN

Fusarium crown rot, caused by Fusarium pseudograminearum, is a devastating disease affecting the yield and quality of cereal crops. Peroxisomes are single-membrane organelles that play a critical role in various biological processes in eukaryotic cells. To functionally characterise peroxisome biosynthetic receptor proteins FpPEX5 and FpPEX7 in F. pseudograminearum, we constructed deletion mutants, ΔFpPEX5 and ΔFpPEX7, and complementary strains, ΔFpPEX5-C and ΔFpPEX7-C, and analysed the functions of FpPEX5 and FpPEX7 proteins using various phenotypic observations. The deletion of FpPEX5 and FpPEX7 resulted in a significant deficiency in mycelial growth and conidiation and blocked the peroxisomal targeting signal 1 and peroxisomal targeting signal 2 pathways, which are involved in peroxisomal matrix protein transport, increasing the accumulation of lipid droplets and reactive oxygen species. The deletion of FpPEX5 and FpPEX7 may reduce the formation of toxigenic bodies and decrease the pathogenicity of F. pseudograminearum. These results indicate that FpPEX5 and FpPEX7 play vital roles in the growth, asexual reproduction, virulence, and fatty acid utilisation of F. pseudograminearum. This study provides a theoretical basis for controlling stem rot in wheat.


Asunto(s)
Proteínas Fúngicas , Fusarium , Peroxisomas , Fusarium/patogenicidad , Fusarium/genética , Fusarium/metabolismo , Fusarium/crecimiento & desarrollo , Proteínas Fúngicas/genética , Proteínas Fúngicas/metabolismo , Virulencia/genética , Peroxisomas/metabolismo , Peroxisomas/genética , Tricotecenos/metabolismo , Enfermedades de las Plantas/microbiología , Esporas Fúngicas/crecimiento & desarrollo , Triticum/microbiología , Especies Reactivas de Oxígeno/metabolismo , Receptor de la Señal 1 de Direccionamiento al Peroxisoma/genética , Receptor de la Señal 1 de Direccionamiento al Peroxisoma/metabolismo , Eliminación de Gen , Regulación Fúngica de la Expresión Génica , Receptor de la Señal 2 de Direccionamiento al Peroxisoma , Micelio/crecimiento & desarrollo , Micelio/metabolismo
20.
Nat Microbiol ; 9(5): 1325-1339, 2024 May.
Artículo en Inglés | MEDLINE | ID: mdl-38589468

RESUMEN

Drug-resistant fungal infections pose a significant threat to human health. Dual-targeting compounds, which have multiple targets on a single pathogen, offer an effective approach to combat drug-resistant pathogens, although ensuring potent activity and high selectivity remains a challenge. Here we propose a dual-targeting strategy for designing antifungal compounds. We incorporate DNA-binding naphthalene groups as the hydrophobic moieties into the host defence peptide-mimicking poly(2-oxazoline)s. This resulted in a compound, (Gly0.8Nap0.2)20, which targets both the fungal membrane and DNA. This compound kills clinical strains of multidrug-resistant fungi including Candida spp., Cryptococcus neoformans, Cryptococcus gattii and Aspergillus fumigatus. (Gly0.8Nap0.2)20 shows superior performance compared with amphotericin B by showing not only potent antifungal activities but also high antifungal selectivity. The compound also does not induce antimicrobial resistance. Moreover, (Gly0.8Nap0.2)20 exhibits promising in vivo therapeutic activities against drug-resistant Candida albicans in mouse models of skin abrasion, corneal infection and systemic infection. This study shows that dual-targeting antifungal compounds may be effective in combating drug-resistant fungal pathogens and mitigating fungal resistance.


Asunto(s)
Antifúngicos , Pruebas de Sensibilidad Microbiana , Antifúngicos/farmacología , Antifúngicos/química , Animales , Ratones , Humanos , Farmacorresistencia Fúngica Múltiple , Modelos Animales de Enfermedad , Cryptococcus neoformans/efectos de los fármacos , Aspergillus fumigatus/efectos de los fármacos , Candida albicans/efectos de los fármacos , Naftalenos/farmacología , Naftalenos/química , Oxazoles/farmacología , Oxazoles/química , Candida/efectos de los fármacos , Micosis/tratamiento farmacológico , Micosis/microbiología
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