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1.
Nature ; 616(7957): 488-494, 2023 04.
Artículo en Inglés | MEDLINE | ID: mdl-37076729

RESUMEN

Depolymerization is a promising strategy for recycling waste plastic into constituent monomers for subsequent repolymerization1. However, many commodity plastics cannot be selectively depolymerized using conventional thermochemical approaches, as it is difficult to control the reaction progress and pathway. Although catalysts can improve the selectivity, they are susceptible to performance degradation2. Here we present a catalyst-free, far-from-equilibrium thermochemical depolymerization method that can generate monomers from commodity plastics (polypropylene (PP) and poly(ethylene terephthalate) (PET)) by means of pyrolysis. This selective depolymerization process is realized by two features: (1) a spatial temperature gradient and (2) a temporal heating profile. The spatial temperature gradient is achieved using a bilayer structure of porous carbon felt, in which the top electrically heated layer generates and conducts heat down to the underlying reactor layer and plastic. The resulting temperature gradient promotes continuous melting, wicking, vaporization and reaction of the plastic as it encounters the increasing temperature traversing the bilayer, enabling a high degree of depolymerization. Meanwhile, pulsing the electrical current through the top heater layer generates a temporal heating profile that features periodic high peak temperatures (for example, about 600 °C) to enable depolymerization, yet the transient heating duration (for example, 0.11 s) can suppress unwanted side reactions. Using this approach, we depolymerized PP and PET to their monomers with yields of about 36% and about 43%, respectively. Overall, this electrified spatiotemporal heating (STH) approach potentially offers a solution to the global plastic waste problem.

2.
J Craniofac Surg ; 35(1): e56-e58, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-37955451

RESUMEN

Hydrocephalus is variously associated with syndromic craniosynostosis (CS), while it is randomly encountered in nonsyndromic CS. But actually, the ventriculomegaly in CS is less described. In this study, the authors aim to establish whether ventriculomegaly is common in patients with CS, in both syndromic and nonsyndromic. Retrospective measurements of Evans index (EI) were taken from thin-section computed tomography scans of 169 preoperative CS patients to assess cerebral ventricular volume. EI >0.3 indicates ventricular enlargement. A total of 169 CS patients who underwent computed tomography scan from February 2018 to December 2021 were retrospectively evaluated, including 114 males and 55 females. The average age at diagnosis was 16 months (range: 1-103 mo). Among them, 37 with syndromic CS, including 17 ventricular megaly patients, had an EI >0.3 (46.0%), and 4 of them had intracranial hypertension and needed ventriculoperitoneal shunt treatment before cranial vault remolding. One hundred and thirty-two had nonsyndromic CS (100 single-suture CS, 32 multisuture CS), and 26 of them had an EI of 0.3 or greater (19.7%). Ventrocular megaly is common among patients with CS. Early craniotomy may stabilize ventricular dilation.


Asunto(s)
Craneosinostosis , Hidrocefalia , Masculino , Femenino , Humanos , Lactante , Preescolar , Niño , Estudios Retrospectivos , Incidencia , Craneosinostosis/complicaciones , Craneosinostosis/diagnóstico por imagen , Craneosinostosis/epidemiología , Cráneo/cirugía , Hidrocefalia/diagnóstico por imagen , Hidrocefalia/epidemiología , Hidrocefalia/cirugía
3.
J Craniofac Surg ; 2024 Sep 06.
Artículo en Inglés | MEDLINE | ID: mdl-39248645

RESUMEN

OBJECT: Observations of preoperative and postoperative orbital morphology following fronto-orbital advancement and cranial vault remodeling (FOA and CVR) in patients with unilateral coronal synostosis (UCS). METHODS: This retrospective cohort included patients diagnosed with unilateral coronal synostosis and treated with fronto-orbital advancement and cranial vault remodeling at the Children's Hospital of Fudan University. The orbital height, orbital width, and orbital volume were obtained from head 3-dimensional computed tomography of preoperation and postoperation. The DICOM data of CT were then imported into mimics research version 21.0. The authors measured OH and OW according to the bony landmarks, then reset the parameters of the soft tissue window, and conducted a 3-dimensional reconstruction of the orbital soft tissue to get OV. The preoperative and postoperative measurements of the intact side were compared with the affected side, respectively. Statistical analysis was performed using SPSS version 25.0 (Ρ=0.05). RESULTS: Twelve patients with UCS (5 male, 7 female) meeting criteria were included in the study. There were 4 patients with UCS on the left and 8 on the right. The average age at initial surgery was 19.50 months. Before the operation, the data of the intact side and the affected side were compared, respectively, and the difference was found to be significant in OH (Ρ=0.005) and OW (Ρ=0.005), while the OV (Ρ=0.106) was not statistically significant. After procedures of FOA and CVR, the data of the intact side and the affected side were compared, respectively, the significant difference was found in OV (Ρ=0.002), while not in OH (Ρ=0.060) or OW (Ρ=0.066). CONCLUSION: After undergoing the operation of FOA and CVR, the OH and OW of the ipsilateral and contralateral sides of patients with UCS were basically symmetrical, while the volume of the affected orbit was still relatively smaller.

4.
Angew Chem Int Ed Engl ; 63(8): e202316005, 2024 Feb 19.
Artículo en Inglés | MEDLINE | ID: mdl-38063141

RESUMEN

Electrocatalysts with atomically dispersed metal sites (e.g., metal-nitrogen-carbon) have been deemed as promising alternatives for noble-metal catalysts in couples of electrocatalytic reactions. However, the modulation of such atomic sites and the understanding of their interactions are still highly challenging. Herein, we propose a unique supermolecule assembly-profile coating strategy to prepare a series of diatomic electrocatalysts by profile coating of eight Prussian blue analogues (PBAs) on supramolecular supports respectively as bimetallic sources. The detailed microstructure analysis revealed that the metal-nitrogen-carbon sites with four- (Zn-N4 ) and five-coordination (Fe-N5 ) via the nitrogen coordination are similar to the cytochrome c oxidases. For promising electrocatalysis, such unique microstructure is able to activate oxygen molecules due to nitrogen-bonding coordination with bimetal sites, thus leading to efficient four-electron oxygen reduction in alkaline, neutral, and acid electrolytes. Especially, zinc group elements (e.g., Zn and Cd) with d10 electron configuration would significantly boost the nitrogen-bonding coordination with bimetal sites to enhance electrocatalytic activity. The proof-of-concept for the general synthesis of advanced electrocatalysts with controllable bimetal active sites and the mechanistic understanding will promote the promising electrocatalysis by applying the similar principles.

5.
J Am Chem Soc ; 145(37): 20624-20633, 2023 Sep 20.
Artículo en Inglés | MEDLINE | ID: mdl-37695570

RESUMEN

With significant advances in metal-organic framework (MOF) nanostructure preparation, however, the facile synthesis of large-scale MOF films with precise control of the interface structure and surface chemistry is still challenging to achieve with satisfactory performance. Herein, we introduce a universal strategy bridging metal corrosion chemistry and bionic mineralization to synthesize 16 MOF films on 7 metal supports under ambient conditions. The robustness to explore unlimited libraries of MOF films (e.g., carboxylate-, N-heterocycle-, phenolic-, and phosphonate-MOFs) on supports is evoked by independently regulating the metal redox behavior, electrolyte properties, and organic ligands along with hydrogen evolution or oxygen reduction, which offers the basic guidelines for regulating the microstructure and composition of MOFs on the Pourbaix diagram. In conjunction with multiple manufacturing methods, we demonstrated proof of concept for "printing" a large variety of MOF patterns from micrometer to meter scales. Furthermore, a large-area electrolyzer (64 cm2) devised enables 5-hydroxymethylfurfural oxidation to achieve a record-breaking current of 3.0 A at 1.63 V with 2,5-furandicarboxylic acid production, leading to the simultaneous production of H2 gas and valuable feedstocks. The improved electrocatalytic activity for significantly boosting the 5-hydroxymethylfurfural oxidation exemplifies one of the functional MOF films for given applications beyond biomass upgrading.

6.
BMC Cardiovasc Disord ; 23(1): 2, 2023 01 04.
Artículo en Inglés | MEDLINE | ID: mdl-36600215

RESUMEN

BACKGROUND: Acute myocardial infarction (AMI) is a common cardiovascular disease. This study aimed to mine biomarkers associated with AMI to aid in clinical diagnosis and management. METHODS: All mRNA and miRNA data were downloaded from public database. Differentially expressed mRNAs (DEmRNAs) and differentially expressed miRNAs (DEmiRNAs) were identified using the metaMA and limma packages, respectively. Functional analysis of the DEmRNAs was performed. In order to explore the relationship between miRNA and mRNA, we construct miRNA-mRNA negative regulatory network. Potential biomarkers were identified based on machine learning. Subsequently, ROC and immune correlation analysis were performed on the identified key DEmRNA biomarkers. RESULTS: According to the false discovery rate < 0.05, 92 DEmRNAs and 272 DEmiRNAs were identified. GSEA analysis found that kegg_peroxisome was up-regulated in AMI and kegg_steroid_hormone_biosynthesis was down-regulated in AMI compared to normal controls. 5 key DEmRNA biomarkers were identified based on machine learning, and classification diagnostic models were constructed. The random forests (RF) model has the highest accuracy. This indicates that RF model has high diagnostic value and may contribute to the early diagnosis of AMI. ROC analysis found that the area under curve of 5 key DEmRNA biomarkers were all greater than 0.7. Pearson correlation analysis showed that 5 key DEmRNA biomarkers were correlated with most of the differential infiltrating immune cells. CONCLUSION: The identification of new molecular biomarkers provides potential research directions for exploring the molecular mechanism of AMI. Furthermore, it is important to explore new diagnostic genetic biomarkers for the diagnosis and treatment of AMI.


Asunto(s)
MicroARNs , Infarto del Miocardio , Humanos , Redes Reguladoras de Genes , Biomarcadores de Tumor/genética , Regulación Neoplásica de la Expresión Génica , MicroARNs/genética , Infarto del Miocardio/diagnóstico , Infarto del Miocardio/genética , Aprendizaje Automático , ARN Mensajero/genética
7.
J Nanobiotechnology ; 21(1): 362, 2023 Oct 04.
Artículo en Inglés | MEDLINE | ID: mdl-37794449

RESUMEN

PURPOSE: Endothelial cell dysfunction is a major cause of early atherosclerosis. Although the role of extracellular vesicles in stabilizing atherosclerotic plaques is well established, the effect of circulating exosomes on plaque formation is still unknown. Here, we explored the effect of exosomes on atherosclerosis based on the function that exosomes can act on intercellular communication. PATIENTS AND METHODS: We extracted serum exosomes from the blood of CHD patients (CHD-Exo) and healthy individuals (Con-Exo). The obtained exosomes were co-cultured with human umbilical vein endothelial cells (HUVECs) in vitro. In addition, we determined that circ_0001785 functions as a competing endogenous RNA (ceRNAs) in coronary artery disease by dual luciferase reporter gene analysis. The protective effect of circ_0001785 against endothelial cell injury was also verified using over-expression lentiviral transfection functional assays. In vivo experiments, we injected over-expressed circ_0001785 lentivirus into the tail vein of mice to observe its therapeutic effect on a mouse model of atherosclerosis. RESULTS: The vitro co-cultured results showed that the amount of plasma-derived exosomes have an increase in patients with coronary artery disease, and the inflammation and apoptosis of endothelial cells were exacerbated. Over-expression of circ_0001785 reduced endothelial cell injury through the ceRNA network pathway of miR-513a-5p/TGFBR3. Quantitative reverse transcription-polymerase chain reaction identified that the expressed amount of circ_0001785 was reduced in the circulating peripheral blood of CHD patients and increased within human and mouse atherosclerotic plaque tissue. The results of in vivo experiments showed that circ_0001785 reduced aortic endothelial cell injury and the formation of intraplaque neo-vascularization, and enhanced left ventricular diastolic function, thereby delaying the development of atherosclerosis in mice. CONCLUSION: Our results demonstrated a new biomarker, exosome-derived circ_0001785, for atherogenesis, which can reduce endothelial cell injury and thus delay atherogenesis through the miR-513a-5p/TGFBR3 ceRNA network mechanism, providing an exosome-based intervention strategy for atherosclerosis.


Asunto(s)
Aterosclerosis , Enfermedad de la Arteria Coronaria , Exosomas , MicroARNs , Placa Aterosclerótica , Humanos , Animales , Ratones , Aterosclerosis/genética , Células Endoteliales de la Vena Umbilical Humana , MicroARNs/genética , Proliferación Celular
8.
J Cell Sci ; 132(1)2019 01 02.
Artículo en Inglés | MEDLINE | ID: mdl-30498011

RESUMEN

Melanoma-associated antigen A1 (MAGEA1) and BORIS (also known as CTCFL) are members of the cancer testis antigen (CTA) family. Their functions and expression-regulation mechanisms are not fully understood. In this study, we reveal new functions and regulatory mechanisms of MAGEA1 and BORIS in breast cancer cells, which we investigated in parental and genetically manipulated breast cancer cells via gene overexpression or siRNA-mediated downregulation. We identified the interaction between MAGEA1 and CTCF, which is required for the binding of MAGEA1 to the BORIS promoter and is critical for the recruitment of DNMT3a. A protein complex containing MAGEA1, CTCF and DNMT3a was formed before or after conjunction with the BORIS promoter. The binding of this complex to the BORIS promoter accounts for the hypermethylation and repression of BORIS expression, which results in cell death in the breast cancer cell lines tested. Multiple approaches were employed, including co-immunoprecipitation, glutathione S-transferase pull-down assay, co-localization and cell death analyses using annexin V-FITC/propidium iodide double-staining and caspase 3 activation assays, chromatin immunoprecipitation and bisulfite sequencing PCR assays for methylation. Our results have implications for the development of strategies in CTA-based immune therapeutics.


Asunto(s)
Neoplasias de la Mama/patología , Metilación de ADN , Proteínas de Unión al ADN/genética , Regulación Neoplásica de la Expresión Génica , Antígenos Específicos del Melanoma/metabolismo , Neoplasias Ováricas/patología , Regiones Promotoras Genéticas , Neoplasias de la Mama/genética , Neoplasias de la Mama/metabolismo , Factor de Unión a CCCTC/genética , Factor de Unión a CCCTC/metabolismo , ADN (Citosina-5-)-Metiltransferasas/genética , ADN (Citosina-5-)-Metiltransferasas/metabolismo , ADN Metiltransferasa 3A , Proteínas de Unión al ADN/metabolismo , Epigénesis Genética , Femenino , Humanos , Antígenos Específicos del Melanoma/genética , Neoplasias Ováricas/genética , Neoplasias Ováricas/metabolismo , Células Tumorales Cultivadas
9.
Eur J Clin Invest ; 51(7): e13541, 2021 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-33797091

RESUMEN

BACKGROUND: Ferroptosis is an iron-dependent and oxidative cell death form. Recent studies suggested that circular RNAs (circRNAs) regulated ferroptosis in tumour cells. Circ_0007142 was identified as a carcinogenic molecule in colorectal cancer (CRC), but its function on ferroptosis in CRC remains unknown. METHODS: Circ_0007142, microRNA-874-3p (miR-874-3p) and glycerophosphodiester phosphodiesterase domain containing 5 (GDPD5) levels were assayed using the quantitative real-time polymerase chain reaction (qRT-PCR). Cell survival and proliferation were measured by Cell Counting Kit-8 (CCK-8) assay. Protein detection was performed by Western blot. Cell apoptosis was analysed by flow cytometry. Ferroptosis was assessed by iron accumulation and oxidative stress. Target binding was evaluated by dual-luciferase reporter assay. In vivo research was conducted by tumour xenograft in mice. RESULTS: Circ_0007142 was overexpressed in CRC. After expression inhibition of circ_0007142, proliferation was reduced, while apoptosis and ferroptosis were facilitated in CRC cells. Mechanically, circ_0007142 was found as a miR-874-3p sponge and miR-874-3p inhibitor eliminated the regulation of si-circ_0007142 in CRC cells. MiR-874-3p targeted GDPD5 and upregulation of GDPD5 reversed the miR-874-3p-triggered tumour inhibition and ferroptosis promotion in CRC cells. Moreover, GDPD5 was regulated by the circ_0007142/miR-874-3p axis. Circ_0007142 also affected CRC tumorigenesis in vivo through the regulation of miR-874-3p and GDPD5. CONCLUSION: All these findings proved that circ_0007142/miR-874-3p/GDPD5 axis regulated tumorigenesis and ferroptosis of CRC cells. Circ_0007142 might be an available marker for ferroptosis in CRC therapy.


Asunto(s)
Adenocarcinoma/genética , Neoplasias Colorrectales/genética , Ferroptosis/genética , MicroARNs/genética , Hidrolasas Diéster Fosfóricas/genética , ARN Circular/genética , Animales , Apoptosis/genética , Western Blotting , Proliferación Celular/genética , Supervivencia Celular/genética , Regulación hacia Abajo , Femenino , Células HCT116 , Humanos , Masculino , Ratones , Persona de Mediana Edad , Trasplante de Neoplasias , Estrés Oxidativo/genética
10.
FEMS Yeast Res ; 21(2)2021 03 18.
Artículo en Inglés | MEDLINE | ID: mdl-33606011

RESUMEN

SLX4 is a scaffold to coordinate the action of structure-specific endonucleases that are required for homologous recombination and DNA repair. In view of ScSLX4 functions in the maintenance and stability of the genome in Saccharomyces cerevisiae, we have explored the roles of CaSLX4 in Candida albicans. Here, we constructed slx4Δ/Δ mutant and found that it exhibited increased sensitivity to the DNA damaging agent, methyl methanesulfonate (MMS) but not the DNA replication inhibitor, hydroxyurea (HU). Accordingly, RT-qPCR and western blotting analysis revealed the activation of SLX4 expression in response to MMS. The deletion of SLX4 resulted in a defect in the recovery from MMS-induced filamentation to yeast form and re-entry into the cell cycle. Like many other DNA repair genes, SLX4 expression was activated by the checkpoint kinase Rad53 under MMS-induced DNA damage. In addition, SLX4 was not required for the inactivation of the DNA damage checkpoint, as indicated by normal phosphorylation of Rad53 in slx4Δ/Δ cells. Therefore, our results demonstrate SLX4 plays an important role in cell recovery from MMS-induced DNA damage in C. albicans.


Asunto(s)
Candida albicans/efectos de los fármacos , Candida albicans/genética , Daño del ADN/efectos de los fármacos , Endodesoxirribonucleasas/genética , Proteínas Fúngicas/genética , Metilmetanosulfonato/farmacología , Proteínas de Saccharomyces cerevisiae/genética , Saccharomyces cerevisiae/genética , Puntos de Control del Ciclo Celular/efectos de los fármacos , Endodesoxirribonucleasas/metabolismo , Proteínas Fúngicas/metabolismo , Hidroxiurea/farmacología , Fosforilación , Saccharomyces cerevisiae/metabolismo , Proteínas de Saccharomyces cerevisiae/metabolismo
11.
Int J Mol Sci ; 22(24)2021 Dec 19.
Artículo en Inglés | MEDLINE | ID: mdl-34948406

RESUMEN

Based on the strategy of the "tail approach", 15 novel saccharide-modified sulfonamides were designed and synthesised. The novel compounds were evaluated as inhibitors of three human carbonic anhydrase (CA) isoforms, namely cytoplasmic CA II, transmembrane CA IX, and XII. Most of these compounds showed good activity against CAs and high topological polar surface area (TPSA) values, which had a positive effect on the selective inhibition of transmembrane isoforms CA IX and XII. In the in vitro activity studies, compounds 16a, 16b, and 16e reduced the viability of HT-29 and MDA-MB-231 cells with a high expression of CA IX under hypoxia. The inhibitory activity of compound 16e on the human osteosarcoma cell line MG-63 with a high expression of CA IX and XII was better than that of AZM. Moreover, high concentrations of compounds 16a and 16b reversed the acidification of the tumour microenvironment. In addition, compound 16a had a certain inhibitory effect on the migration of MDA-MB-231 cells. All the above results indicate that the saccharide-modified sulfonamide has further research value for the development of CA IX inhibitors.


Asunto(s)
Anhidrasa Carbónica IX/antagonistas & inhibidores , Inhibidores de Anhidrasa Carbónica/química , Inhibidores de Anhidrasa Carbónica/farmacología , Sulfonamidas/química , Sulfonamidas/farmacología , Antígenos de Neoplasias/metabolismo , Anhidrasa Carbónica IX/metabolismo , Inhibidores de Anhidrasa Carbónica/síntesis química , Línea Celular Tumoral , Células HT29 , Humanos , Simulación del Acoplamiento Molecular , Isoformas de Proteínas/antagonistas & inhibidores , Isoformas de Proteínas/metabolismo , Sulfonamidas/síntesis química
12.
Biochem Biophys Res Commun ; 518(1): 19-25, 2019 10 08.
Artículo en Inglés | MEDLINE | ID: mdl-31405563

RESUMEN

INMAP was first identified as a spindle protein that plays important roles in cell-cycle progression, and previous studies have revealed that its abnormal expression leads to mitotic disorder and the growth inhibition of human tumor xenografts, but the underlying mechanism is still unclear. In this study, we knocked out INMAP in HEK293T cells, a strain of human embryonic renal cells, through CRISPR-Cas9 gene editing technology, resulting in obvious cell growth inhibition. In this system, the deletion of INMAP caused obviously apoptosis. And we also found that knockout of INMAP caused micronuclei formation, chromosome aberration, and γH2AX expression upregulation, suggesting DNA damage induction and genomic stability impairment. As a principal component of spindle, the expression of ß-tubulin, detected through Western blot, is obviously upregulated in HEK293T-INMAP-/-. Meanwhile, the level of Cyclin B is also upregulated, whereas, that of Cyclin E, downregulated, with the postponement of mitotic exit and the assembly anomaly of spindle. These results suggest that the deletion of INMAP block the formation of spindle, leading to arrest of cell cycle and DNA damage, finally blocking cell proliferation and inducing apoptosis. Therefore, INMAP is an indispensable factor for genomic integrity and normal mitotic exit.


Asunto(s)
Apoptosis , Proteínas de Ciclo Celular/metabolismo , Eliminación de Gen , Mitosis , Proteínas Nucleares/metabolismo , Huso Acromático/metabolismo , Puntos de Control del Ciclo Celular , Proliferación Celular , Daño del ADN , Células HEK293 , Humanos , Transducción de Señal , Tubulina (Proteína)/metabolismo
13.
Fungal Genet Biol ; 131: 103240, 2019 10.
Artículo en Inglés | MEDLINE | ID: mdl-31185286

RESUMEN

Protein phosphatase-2A (PP2A) is a heterotrimeric enzyme composed of a catalytic subunit, a regulatory subunit, and a structural subunit. In Candida albicans, Cdc55 and Rts1 have been identified as possible regulatory subunits of PP2A containing the catalytic subunit Pph21 and structural subunit Tpd3. The Tpd3-Pph21 phosphatase regulates cell morphogenesis and division. However, the functions of Cdc55 and Rts1 remain unclear. Here, we constructed cdc55Δ/Δ and rts1Δ/Δ mutants and found that they exhibit different defects in multiple phenotypes although both show similar hyperphosphorylation of the septin Sep7 and aberrant septin organization. Under yeast growth conditions, the cdc55Δ/Δ mutant grows slowly as pseudohyphae with some cells lacking the nucleus, while rts1Δ/Δ cells are round and enlarged and seem to undergo incomplete cell separation producing multinucleated cells. Strong chitin deposition occurs at the septum of cdc55Δ/Δ cells and on the surface of rts1Δ/Δ cells, which likely contributes to increased susceptibility to caspofungin. Also, cdc55Δ/Δ exhibits severe defects in hyphal and biofilm formation, while rts1Δ/Δ is partially defective. Both mutants show reduced virulence in mice, suggesting that PP2A-B subunits could serve as potential antifungal targets.


Asunto(s)
Candida albicans/crecimiento & desarrollo , Candida albicans/patogenicidad , Candidiasis/patología , Dominio Catalítico/genética , Proteínas de Ciclo Celular/metabolismo , Proteínas Fúngicas/metabolismo , Proteína Fosfatasa 2/metabolismo , Animales , Candida albicans/efectos de los fármacos , Candida albicans/genética , Candidiasis/microbiología , Caspofungina/farmacología , Proteínas de Ciclo Celular/genética , División Celular/genética , Modelos Animales de Enfermedad , Farmacorresistencia Fúngica/genética , Femenino , Proteínas Fúngicas/genética , Eliminación de Gen , Riñón/microbiología , Riñón/patología , Ratones , Ratones Endogámicos BALB C , Pruebas de Sensibilidad Microbiana , Fenotipo , Fosforilación/genética , Proteína Fosfatasa 2/genética , Virulencia/genética
14.
Small ; 14(20): e1800737, 2018 May.
Artículo en Inglés | MEDLINE | ID: mdl-29665265

RESUMEN

Zinc-air batteries with high-density energy are promising energy storage devices for the next generation of energy storage technologies. However, the battery performance is highly dependent on the efficiency of oxygen electrocatalyst in the air electrode. Herein, the N, F, and B ternary doped carbon fibers (TD-CFs) are prepared and exhibited higher catalytic properties via the efficient 4e- transfer mechanism for oxygen reduction in comparison with the single nitrogen doped CFs. More importantly, the primary and rechargeable Zn-air batteries using TD-CFs as air-cathode catalysts are constructed. When compared to batteries with Pt/C + RuO2 and Vulcan XC-72 carbon black catalysts, the TD-CFs catalyzed batteries exhibit remarkable battery reversibility and stability over long charging/discharging cycles.

15.
Adv Mater ; : e2409949, 2024 Sep 02.
Artículo en Inglés | MEDLINE | ID: mdl-39223931

RESUMEN

High-entropy oxides (HEOs) exhibit distinctive catalytic properties owing to their diverse elemental compositions, garnering considerable attention across various applications. However, the preparation of HEO nanoparticles with different spatial structures remains challenging due to their inherent structural instability. Herein, ultrasmall high-entropy oxide nanoparticles (less than 5 nm) with different spatial structures are synthesized on carbon supports via the rapid thermal shock treatment. The low-symmetry HEO, BiSbInCdSn-O4, demonstrates exceptional performance for electrocatalytic carbon dioxide reaction (eCO2RR), including a lower overpotential, high Faraday efficiency across a wide electrochemical range (-0.3 to -1.6 V), and sustained stability for over100 h. In the membrane electrode assembly electrolyzer, BiSbInCdSn-O4 achieves a current density of 350 mA cm-2 while maintaining good stability for 24 h. Both experimental observations and theoretical calculations reveal that the electron donor-acceptor interactions between bismuth and indium sites in BiSbInCdSn-O4 enable the electron delocalization to facilitate the efficient adsorption of CO2 and hydrogenation reactions. Thus, the energy barrier of the rate-determining step is reduced to enhance the electrocatalytic activity and stability. This study elucidates that the spatial structure of metal sites in HEOs is able to regulate CO2 adsorption status for eCO2RR, paving the way for the rational design of efficient HEO catalysts.

16.
J Cancer Res Clin Oncol ; 150(8): 388, 2024 Aug 09.
Artículo en Inglés | MEDLINE | ID: mdl-39120743

RESUMEN

BACKGROUND: Cancer-associated fibroblasts (CAFs) play a crucial role in the progression of colorectal cancer (CRC). However, the impact of CAF subpopulation trajectory differentiation on CRC remains unclear. METHODS: In this study, we first explored the trajectory differences of CAFs subpopulations using bulk and integrated single-cell sequencing data, and then performed consensus clustering of CRC samples based on the trajectory differential genes of CAFs subpopulations. Subsequently, we analyzed the heterogeneity of CRC subtypes using bioinformatics. Finally, we constructed relevant prognostic signature using machine learning and validated them using spatial transcriptomic data. RESULTS: Based on the differential genes of CAFs subpopulation trajectory differentiation, we identified two CRC subtypes (C1 and C2) in this study. Compared to C1, C2 exhibited worse prognosis, higher immune evasion microenvironment and high CAF characteristics. C1 was primarily associated with metabolism, while C2 was primarily associated with cell metastasis and immune regulation. By combining 101 combinations of 10 machine learning algorithms, we developed a High-CAF risk signatures (HCAFRS) based on the C2 characteristic gene. HCAFRS was an independent prognostic factor for CRC and, when combined with clinical parameters, significantly predicted the overall survival of CRC patients. HCAFRS was closely associated with epithelial-mesenchymal transition, angiogenesis, and hypoxia. Furthermore, the risk score of HCAFRS was mainly derived from CAFs and was validated in the spatial transcriptomic data. CONCLUSION: In conclusion, HCAFRS has the potential to serve as a promising prognostic indicator for CRC, improving the quality of life for CRC patients.


Asunto(s)
Fibroblastos Asociados al Cáncer , Neoplasias Colorrectales , Microambiente Tumoral , Neoplasias Colorrectales/genética , Neoplasias Colorrectales/patología , Humanos , Fibroblastos Asociados al Cáncer/patología , Fibroblastos Asociados al Cáncer/metabolismo , Pronóstico , Microambiente Tumoral/genética , Análisis por Conglomerados , Aprendizaje Automático , Biomarcadores de Tumor/genética , Transcriptoma , Regulación Neoplásica de la Expresión Génica , Perfilación de la Expresión Génica/métodos , Femenino , Masculino
17.
CNS Neurosci Ther ; 30(2): e14634, 2024 02.
Artículo en Inglés | MEDLINE | ID: mdl-38379112

RESUMEN

Ischemic stroke, accounting for the majority of stroke events, significantly contributes to global morbidity and mortality. Vascular recanalization therapies, namely intravenous thrombolysis and mechanical thrombectomy, have emerged as critical interventions, yet their success hinges on timely application and patient-specific factors. This review focuses on the early phase pathophysiological mechanisms of ischemic stroke and the nuances of recanalization. It highlights the dual role of neutrophils in tissue damage and repair, and the critical involvement of the blood-brain barrier (BBB) in stroke outcomes. Special emphasis is placed on ischemia-reperfusion injury, characterized by oxidative stress, inflammation, and endothelial dysfunction, which paradoxically exacerbates cerebral damage post-revascularization. The review also explores the potential of targeting molecular pathways involved in BBB integrity and inflammation to enhance the efficacy of recanalization therapies. By synthesizing current research, this paper aims to provide insights into optimizing treatment protocols and developing adjuvant neuroprotective strategies, thereby advancing stroke therapy and improving patient outcomes.


Asunto(s)
Isquemia Encefálica , Accidente Cerebrovascular Isquémico , Accidente Cerebrovascular , Humanos , Accidente Cerebrovascular Isquémico/terapia , Accidente Cerebrovascular/terapia , Terapia Trombolítica , Trombectomía/métodos , Inflamación , Isquemia Encefálica/terapia , Resultado del Tratamiento
18.
JMIR Public Health Surveill ; 10: e51802, 2024 Feb 16.
Artículo en Inglés | MEDLINE | ID: mdl-38149840

RESUMEN

BACKGROUND: Hypertension and diabetes are global health challenges requiring effective management to mitigate their considerable burden. The successful management of hypertension and diabetes requires the completion of a sequence of stages, which are collectively termed the care cascade. OBJECTIVE: This scoping review aimed to describe the characteristics of studies on the hypertension and diabetes care cascade and identify potential interventions as well as factors that impact each stage of the care cascade. METHODS: The method of this scoping review has been guided by the framework by Arksey and O'Malley. We systematically searched MEDLINE, Embase, and Web of Science using terms pertinent to hypertension, diabetes, and specific stages of the care cascade. Articles published after 2011 were considered, and we included all studies that described the completion of at least one stage of the care cascade of hypertension and diabetes. Study selection was independently performed by 2 paired authors. Descriptive statistics were used to elucidate key patterns and trends. Inductive content analysis was performed to generate themes regarding the barriers and facilitators for improving the care cascade in hypertension and diabetes management. RESULTS: A total of 128 studies were included, with 42.2% (54/128) conducted in high-income countries. Of them, 47 (36.7%) focused on hypertension care, 63 (49.2%) focused on diabetes care, and only 18 (14.1%) reported on the care of both diseases. The majority (96/128, 75.0%) were observational in design. Cascade stages documented in the literature were awareness, screening, diagnosis, linkage to care, treatment, adherence to medication, and control. Most studies focused on the stages of treatment and control, while a relative paucity of studies examined the stages before treatment initiation (76/128, 59.4% vs 52/128, 40.6%). There was a wide spectrum of interventions aimed at enhancing the hypertension and diabetes care cascade. The analysis unveiled a multitude of individual-level and system-level factors influencing the successful completion of cascade sequences in both high-income and low- and middle-income settings. CONCLUSIONS: This review offers a comprehensive understanding of hypertension and diabetes management, emphasizing the pivotal factors that impact each stage of care. Future research should focus on upstream cascade stages and context-specific interventions to optimize patient retention and care outcomes.


Asunto(s)
Diabetes Mellitus , Hipertensión , Humanos , Hipertensión/terapia , Hipertensión/epidemiología , Diabetes Mellitus/terapia , Diabetes Mellitus/epidemiología , Manejo de la Enfermedad
19.
Syst Appl Microbiol ; 47(6): 126555, 2024 Sep 24.
Artículo en Inglés | MEDLINE | ID: mdl-39342656

RESUMEN

Microbial communities in marine sediments represent some of the densest and most diverse biological communities known, with up to a billion cells and thousands of species per milliliter. Among this taxonomic diversity, the class Acidimicrobiia, within the phylum Actinomycetota, stands out for its consistent presence, yet its limited taxonomic understanding obscures its ecological role. We used metagenome-assembled genomes from a 5-year Arctic fjord sampling campaign and compared them to publicly available Acidimicrobiia genomes using 16S rRNA gene and whole-genome phylogenies, alongside gene prediction and annotation to study their taxonomy and genomic potential. Overall, we provide a taxonomic overview of the class Acidimicrobiia and show its significant prevalence in Isfjorden and Helgoland coastal sediments, representing over 90% of Actinomycetota 16S rRNA gene sequences, and 3-7% of Bacteria. We propose Benthobacter isfjordensis gen. nov., sp. nov., Hadalibacter litoralis gen. nov., sp. nov., and two new species from Ilumatobacter, following SeqCode guidelines. In addition, we report the first in situ quantification of the family Ilumatobacteraceae, revealing its substantial presence (1-6%) in coastal sediments. This work highlights the need of refining the taxonomy of Acidimicrobiia to better understand their ecological contributions.

20.
Discov Oncol ; 15(1): 107, 2024 Apr 07.
Artículo en Inglés | MEDLINE | ID: mdl-38583115

RESUMEN

Ferroptosis is a novel form of programmed death, dependent on iron ions and oxidative stress, with a predominant intracellular form of lipid peroxidation. In recent years, ferroptosis has gained more and more interest of people in the treatment mechanism of targeted tumors. mTOR, always overexpressed in the tumor, and controlling cell growth and metabolic activities, has an important role in both autophagy and ferroptosis. Interestingly, the selective types of autophay plays an important role in promoting ferroptosis, which is related to mTOR and some metabolic pathways (especially in iron and amino acids). In this paper, we list the main mechanisms linking ferroptosis with mTOR signaling pathway and further summarize the current compounds targeting ferroptosis in these ways. There are growing experimental evidences that targeting mTOR and ferroptosis may have effective impact in many tumors, and understanding the mechanisms linking mTOR to ferroptosis could provide a potential therapeutic approach for tumor treatment.

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