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1.
Proc Natl Acad Sci U S A ; 121(25): e2406788121, 2024 Jun 18.
Artigo em Inglês | MEDLINE | ID: mdl-38865267

RESUMO

Heritable symbionts are common among animals in nature, but the molecular mechanisms underpinning symbiont invasions of host populations have been elusive. In this study, we demonstrate the spread of Rickettsia in an invasive agricultural pest, the whitefly Bemisia tabaci Mediterranean (MED), across northeastern China from 2018 to 2023. Here, we show that the beneficial symbiont Rickettsia spreads by manipulating host hormone signals. Our analyses suggest that Rickettsia have been horizontally acquired by B. tabaci MED from another invasive whitefly B. tabaci Middle East-Asia Minor 1 during periods of coexistence. Rickettsia is transmitted maternally and horizontally from female B. tabaci MED individuals. Rickettsia infection enhances fecundity and results in female bias among whiteflies. Our findings reveal that Rickettsia infection stimulates juvenile hormone (JH) synthesis, in turn enhancing fecundity, copulation events, and the female ratio of the offspring. Consequently, Rickettsia infection results in increased whitefly fecundity and female bias by modulating the JH pathway. More female progeny facilitates the transmission of Rickettsia. This study illustrates that the spread of Rickettsia among invasive whiteflies in northeastern China is propelled by host hormone regulation. Such symbiont invasions lead to rapid physiological and molecular evolution in the host, influencing the biology and ecology of an invasive species.


Assuntos
Fertilidade , Hemípteros , Rickettsia , Razão de Masculinidade , Simbiose , Animais , Rickettsia/fisiologia , Hemípteros/microbiologia , Hemípteros/fisiologia , Feminino , Masculino , Hormônios Juvenis/metabolismo , China
2.
Proc Natl Acad Sci U S A ; 119(12): e2116543119, 2022 03 22.
Artigo em Inglês | MEDLINE | ID: mdl-35298336

RESUMO

Here, we report the use of an amphiphilic Pt(II) complex, K[Pt{(O3SCH2CH2CH2)2bzimpy}Cl] (PtB), as a model to elucidate the key role of Pt···Pt interactions in directing self-assembly by combining temperature-dependent ultraviolet-visible (UV-Vis) spectroscopy, stopped-flow kinetic experiments, quantum mechanics (QM) calculations, and molecular dynamics (MD) simulations. Interestingly, we found that the self-assembly mechanism of PtB in aqueous solution follows a nucleation-free isodesmic model, as revealed by the temperature-dependent UV-Vis experiments. In contrast, a cooperative growth is found for the self-assembly of PtB in acetone­water (7:1, vol/vol) solution, which is further verified by the stopped-flow experiments, which clearly indicates the existence of a nucleation phase in the acetone­water (7:1, vol/vol) solution. To reveal the underlying reasons and driving forces for these self-assembly processes, we performed QM calculations and show that the Pt···Pt interactions arising from the interaction between the pz and dz2 orbitals play a crucial role in determining the formation of ordered self-assembled structures. In subsequent oligomer MD simulations, we demonstrate that this directional Pt···Pt interaction can indeed facilitate the formation of linear structures packed in a helix-like fashion. Our results suggest that the self-assembly of PtB in acetone­water (7:1, vol/vol) solution is predominantly driven by the directional noncovalent Pt···Pt interaction, leading to the cooperative growth and the formation of fibrous nanostructures. On the contrary, the self-assembly in aqueous solution forms spherical nanostructures of PtB, which is primarily due to the predominant contribution from the less directional hydrophobic interactions over the directional Pt···Pt and π−π interactions that result in an isodesmic growth.

3.
Langmuir ; 40(1): 614-623, 2024 Jan 09.
Artigo em Inglês | MEDLINE | ID: mdl-38150370

RESUMO

Solar-energy-driven CO2 hydrogenation is a promising strategy to alleviate the climate crisis. Methane is a desirable derivative of CO2 reduction. However, developing a photocatalyst for highly active and selective CH4 generation remains challenging. Herein, we report a double Z-scheme Bi3O4Cl/g-C3N4/Cd0.5Zn0.5S photocatalyst for efficient reduction of CO2 to CH4. In situ characterization techniques confirmed that the charge migration mechanism in Bi3O4Cl/g-C3N4/Cd0.5Zn0.5S promotes charge separation through double internal electric fields. As a result, the optimized C0.01B0.02C catalyst displayed a formation rate high up to 25.34 µmol g-1 h-1 and a selectivity of 96.52% of CH4. Moreover, the AQY of CO2 conversion on C0.01B0.02C (1.84%) was almost 41 times higher than that of the bare CN. This study provides a novel perspective to develop heterojunction photocatalysts for selective CO2 conversion to CH4.

4.
Faraday Discuss ; 249(0): 181-194, 2024 Feb 06.
Artigo em Inglês | MEDLINE | ID: mdl-37791622

RESUMO

The nanoconfinement of water can result in dramatic differences in its physical and chemical properties compared to bulk water. However, a detailed molecular-level understanding of these properties is still lacking. Vibrational spectroscopy, such as Raman and infrared, is a popular experimental tool for studying the structure and dynamics of water, and is often complemented by atomistic simulations to interpret experimental spectra, but there have been few theoretical spectroscopy studies of nanoconfined water using first-principles methods at ambient conditions, let alone under extreme pressure-temperature conditions. Here, we compute the Raman and IR spectra of water nanoconfined by graphene at ambient and extreme pressure-temperature conditions using ab initio simulations. Our results revealed alterations in the Raman stretching and low-frequency bands due to the graphene confinement. We also found spectroscopic evidence indicating that nanoconfinement considerably changes the tetrahedral hydrogen bond network, which is typically found in bulk water. Furthermore, we observed an unusual bending band in the Raman spectrum at ∼10 GPa and 1000 K, which is attributed to the unique molecular structure of confined ionic water. Additionally, we found that at ∼20 GPa and 1000 K, confined water transformed into a superionic fluid, making it challenging to identify the IR stretching band. Finally, we computed the ionic conductivity of confined water in the ionic and superionic phases. Our results highlight the efficacy of Raman and IR spectroscopy in studying the structure and dynamics of nanoconfined water in a large pressure-temperature range. Our predicted Raman and IR spectra can serve as a valuable guide for future experiments.

5.
Zhongguo Zhong Yao Za Zhi ; 49(10): 2776-2782, 2024 May.
Artigo em Chinês | MEDLINE | ID: mdl-38812178

RESUMO

This study explore the molecular mechanism of the synergistic effect of Chinese Yam polysaccharides and nucleoside analogues(NAs) on hepatitis B virus(HBV) resistance. Different concentrations of Chinese Yam polysaccharide and entecavir were ad-ded to HepG2.2.15 cells. After the cytotoxicity was detected by cell counting kit-8(CCK-8), the optimal concentration and time of the two drugs to inhibit HepG2.2.15 cells were screened out. They were divided into control group, Chinese Yam polysaccharide group, entecavir group and combination drug group(Chinese Yam polysaccharide + entecavir). The drugs were added to HepG2.2.15 cells, ELISA was used to detect the effects of each group of drugs on the secretion of hepatitis B virus surface antigen(HBsAg) and hepatitis B virus e antigen(HBeAg) in cell supernatant, probe quantitative real-time PCR(probe qRT-PCR) was used to detect the effects of drugs on HBV-DNA in HepG2.2.15 cells, and Western blot was used to detect the effects of each group of drugs on the expression of p38 MAPK, p-p38 MAPK, NTCP proteins in HepG2.2.15 cells. The qRT-PCR was used to detect the effect of drugs on the expression of p38 MAPK and NTCP mRNA in HepG2.2.15 cells. The results showed that compared with control group, the concentrations of HBeAg and HBsAg in Chinese Yam polysaccharide group, entecavir group and combination group decreased(P<0.01 or P<0.001), and both of them inhibited HBV-DNA in HepG2.2.15 cells(P<0.01), and the HBV-DNA inhibition of HepG2.2.15 cells in the combination group was more obvious(P<0.001), and the protein expression levels of p-p38 MAPK and NTCP were significantly decreased(P<0.05 or P<0.01), the mRNA expression level of p38 MAPK increased, and the mRNA expression level of NTCP decreased(P<0.05 or P<0.01). To sum up, Chinese Yam polysaccharide can reduce the expression of NTCP protein and mRNA through p38 MAPK signaling pathway and cooperate with entecavir in anti-HBV.


Assuntos
Antivirais , Dioscorea , Vírus da Hepatite B , Polissacarídeos , Proteínas Quinases p38 Ativadas por Mitógeno , Humanos , Vírus da Hepatite B/efeitos dos fármacos , Vírus da Hepatite B/genética , Polissacarídeos/farmacologia , Proteínas Quinases p38 Ativadas por Mitógeno/metabolismo , Proteínas Quinases p38 Ativadas por Mitógeno/genética , Células Hep G2 , Antivirais/farmacologia , Dioscorea/química , Sinergismo Farmacológico , Nucleosídeos/farmacologia , Sistema de Sinalização das MAP Quinases/efeitos dos fármacos , Antígenos de Superfície da Hepatite B/metabolismo , Antígenos de Superfície da Hepatite B/genética , Antígenos E da Hepatite B/metabolismo , Hepatite B/tratamento farmacológico , Hepatite B/virologia , Medicamentos de Ervas Chinesas/farmacologia , Medicamentos de Ervas Chinesas/química , Guanina/análogos & derivados , Guanina/farmacologia
6.
Small ; 19(22): e2300460, 2023 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-36855324

RESUMO

Photocatalysis driven by solar energy is a feasible strategy to alleviate energy crises and environmental problems. In recent years, significant progress has been made in developing advanced photocatalysts for efficient solar-to-chemical energy conversion. Single-atom catalysts have the advantages of highly dispersed active sites, maximum atomic utilization, unique coordination environment, and electronic structure, which have become a research hotspot in heterogeneous photocatalysis. This paper introduces the potential supports, preparation, and characterization methods of single-atom photocatalysts in detail. Subsequently, the fascinating effects of single-atom photocatalysts on three critical steps of photocatalysis (the absorption of incident light to produce electron-hole pairs, carrier separation and migration, and interface reactions) are analyzed. At the same time, the applications of single-atom photocatalysts in energy conversion and environmental protection (CO2 reduction, water splitting, N2 fixation, organic macromolecule reforming, air pollutant removal, and water pollutant degradation) are systematically summarized. Finally, the opportunities and challenges of single-atom catalysts in heterogeneous photocatalysis are discussed. It is hoped that this work can provide insights into the design, synthesis, and application of single-atom photocatalysts and promote the development of high-performance photocatalytic systems.

7.
Small ; 19(48): e2303632, 2023 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-37541658

RESUMO

Covalent organic frameworks (COFs) are one type of porous organic materials linked by covalent bonds. COFs materials exhibit many outstanding characteristics such as high porosity, high chemical and thermal stability, large specific surface area, efficient electron transfer efficiency, and the ability for predesigned structures. These exceptional advantages enable COFs materials to exhibit remarkable performance in photocatalysis. Additionally, the activity of COFs materials as photocatalysts can be significantly upgraded by ion doping and the formation of heterojunctions. This paper summarizes the latest research progress on COF-based materials applied in photocatalytic systems. Initially, typical structures and preparation methods of COFs are analyzed and compared. Moreover, the essential principles of photocatalytic reactions over COFs-based materials and the latest research developments in photocatalytic hydrogen production, CO2 reduction, pollutants elimination, organic transformation, and overall water splitting are indicated. At last, the outlook and challenges of COF-based materials in photocatalysis are discussed. This review is intended to permit instructive guidance for the efficient use of photocatalysis based on COFs in the future.

8.
Small ; 19(19): e2207875, 2023 May.
Artigo em Inglês | MEDLINE | ID: mdl-36772913

RESUMO

Converting CO2 into value-added products by photocatalysis, electrocatalysis, and photoelectrocatalysis is a promising method to alleviate the global environmental problems and energy crisis. Among the semiconductor materials applied in CO2 catalytic reduction, Cu2 O has the advantages of abundant reserves, low price and environmental friendliness. Moreover, Cu2 O has unique adsorption and activation properties for CO2 , which is conducive to the generation of C2+ products through CC coupling. This review introduces the basic principles of CO2 reduction and summarizes the pathways for the generation of C1 , C2 , and C2+ products. The factors affecting CO2 reduction performance are further discussed from the perspective of the reaction environment, medium, and novel reactor design. Then, the properties of Cu2 O-based catalysts in CO2 reduction are summarized and several optimization strategies to enhance their stability and redox capacity are discussed. Subsequently, the application of Cu2 O-based catalysts in photocatalytic, electrocatalytic, and photoelectrocatalytic CO2 reduction is described. Finally, the opportunities, challenges and several research directions of Cu2 O-based catalysts in the field of CO2 catalytic reduction are presented, which is guidance for its wide application in the energy and environmental fields is provided.

9.
Small ; 19(38): e2301892, 2023 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-37194985

RESUMO

Photocatalytic CO2 reduction to valuable fuels is a promising way to alleviate anthropogenic CO2 emissions and energy crises. Perovskite oxides have attracted widespread attention as photocatalysts for CO2 reduction by virtue of their high catalytic activity, compositional flexibility, bandgap adjustability, and good stability. In this review, the basic theory of photocatalysis and the mechanism of CO2 reduction over perovskite oxide are first introduced. Then, perovskite oxides' structures, properties, and preparations are presented. In detail, the research progress on perovskite oxides for photocatalytic CO2 reduction is discussed from five aspects: as a photocatalyst in its own right, metal cation doping at A and B sites of perovskite oxides, anion doping at O sites of perovskite oxides and oxygen vacancies, loading cocatalyst on perovskite oxides, and constructing heterojunction with other semiconductors. Finally, the development prospects of perovskite oxides for photocatalytic CO2 reduction are put forward. This article should serve as a useful guide for creating perovskite oxide-based photocatalysts that are more effective and reasonable.

10.
Chemistry ; 29(36): e202300776, 2023 Jun 27.
Artigo em Inglês | MEDLINE | ID: mdl-37073779

RESUMO

The incorporation of the privileged amino functionality is of paramount importance in organic synthesis. In contrast to the well-developed amination methods for alkenes, the dearomative amination of arenes is largely underexplored due to the inherently inert reactivity of arene π-bonds and selectivity challenges. Herein, we report an intermolecular dearomative aminofunctionalization via direct nucleophilic addition of simple amines to chromium-bound arenes. This multicomponent 1,2-amination/carbonylation reaction enables rapid access to complicated alicyclic compounds containing amino and amide functionalities from benzene derivatives under CO-gas-free conditions, which also represents the first application of nitrogen-based nucleophiles in η6 -coordination-induced arene dearomatizations.

11.
BMC Cancer ; 23(1): 920, 2023 Sep 29.
Artigo em Inglês | MEDLINE | ID: mdl-37773106

RESUMO

BACKGROUND: Despite major advances in cancer therapeutics, the therapeutic options of Lung Squamous Cell Carcinoma (LSCC)-specific remain limited. Furthermore, the current staging system is imperfect for defining a prognosis and guiding treatment due to its simplicity and heterogeneity. We sought to develop prognostic decision tools for individualized survival prediction and treatment optimization in elderly patients with LSCC. METHODS: Clinical data of 4564 patients (stageIB-IIIB) diagnosed from 2010 to 2015 were extracted from the Surveillance, Epidemiology, and End Results (SEER) database for prognostic nomograms development. The proposed models were externally validated using a separate group consisting of 1299 patients (stage IB-IIIB) diagnosed from 2012-2015 in China. The prognostic performance was measured using the concordance index (C-index), calibration curves, the average time-dependent area under the receiver operator characteristic curves (AUC), and decision curve analysis. RESULTS: Eleven candidate prognostic variables were identified by the univariable and multivariable Cox regression analysis. The calibration curves showed satisfactory agreement between the actual and nomogram-estimated Lung Cancer-Specific Survival (LCSS) rates. By calculating the c-indices and average AUC, our nomograms presented a higher prognostic accuracy than the current staging system. Clinical usefulness was revealed by the decision curve analysis. User-friendly online decision tools integrating proposed nomograms were created to estimate survival for patients with different treatment regimens. CONCLUSIONS: The decision tools for individualized survival prediction and treatment optimization might facilitate clinicians with decision-making, medical teaching, and experimental design. Online tools are expected to be integrated into clinical practice by using the freely available website ( https://loyal-brand-611803.framer.app/ ).


Assuntos
Carcinoma Pulmonar de Células não Pequenas , Carcinoma de Células Escamosas , Neoplasias Pulmonares , Humanos , Idoso , Estadiamento de Neoplasias , Estudos Retrospectivos , Prognóstico , Carcinoma de Células Escamosas/patologia , Nomogramas , Carcinoma Pulmonar de Células não Pequenas/patologia , Neoplasias Pulmonares/diagnóstico , Neoplasias Pulmonares/terapia , Pulmão/patologia , Programa de SEER
12.
Arch Microbiol ; 205(1): 49, 2023 Jan 03.
Artigo em Inglês | MEDLINE | ID: mdl-36595076

RESUMO

Campylobacter is regarded as the leading cause of zoonotic diseases and Campylobacter jejuni (C. jejuni) is one of the predominant pathogenic species. To track C. jejuni infections, various genotyping methods have been used. In this study, amplified intergenic locus polymorphism (AILP) was used to type C. jejuni for the first time. To confirm its feasibility, pulsed-field gel electrophoresis (PFGE) was performed as a control, and the results obtained by the AILP and PFGE methods were compared. Fifty-one isolates were resolved into 34 and 29 different genotypes with Simpson's indices of 0.976 and 0.967 using the AILP and PFGE methods, respectively. The adjusted Rand coefficient of the two approaches was as high as 0.845. In summary, the data showed that the two genotyping methods were similar for discriminating isolates and were both appropriate methods to distinguish whether two isolates were indistinguishable, but the AILP was faster and less costly than PFGE. Therefore, the AILP is a reliable, rapid, and highly discriminative method to genotype C. jejuni collected from poultry meat, which is helpful to effectively monitor C. jejuni.


Assuntos
Infecções por Campylobacter , Campylobacter jejuni , Animais , Campylobacter jejuni/genética , Eletroforese em Gel de Campo Pulsado , Tipagem Molecular , Polimorfismo Genético , Genótipo , Galinhas , Técnicas de Tipagem Bacteriana/métodos
13.
Phys Chem Chem Phys ; 25(7): 5627-5637, 2023 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-36727641

RESUMO

One of the challenging problems in the research field of polymer nanocomposites is how to prepare nanocomposites with high grafting density and strong ability of dispersion at the same time. For nanocomposites composed of bimodal bidisperse polymer chains and nanoparticles, the above requirements can be met by rationally adjusting the ratio of long and short polymer chains. In this study, the process of grafting bimodal bidisperse polymer chains onto the surface of nanoparticles in a grafting-to manner was investigated via computer simulation and theoretical methods. Three grafting strategies were designed: first short then long (SL) system, both short and long (Both) system and first long then short (LS) system. An abnormal phenomenon for the Both system was found by analyzing the grafting density of long and short polymer chains on the surface of nanoparticles. We speculate that the reason for this anomalous phenomenon is the "depletion effect" brought about by the long chains in the Both system. We employ the Polymer Reference Interaction Site Model (PRISM) theory to investigate this anomaly in-depth. By comparing the radial distribution function (RDF) predicted by the PRISM theory with the RDF results obtained by the molecular dynamics (MD) simulation, we found that with the increase of the number of long chains in the system, the grafting density of short polymer chains on the nanoparticle surface showed an obvious upward trend. The "depletion effect" brought by long chains was the main reason for higher short chains' grafting density of the Both system compared to the SL system. Our findings provide effective guidance for the design of nanoparticle-grafted bimodal bidisperse polymer chains and provide a theoretical basis for experimentation and production of polymer nanocomposites with better performance.

14.
Curr Microbiol ; 80(12): 402, 2023 Nov 06.
Artigo em Inglês | MEDLINE | ID: mdl-37930435

RESUMO

The genotyping of Campylobacter coli was done using three methods, pulsed-field gel electrophoresis (PFGE), Sau-polymerase chain reaction (Sau-PCR), and denaturing gradient gel electrophoresis assay of flagellin gene (fla-DGGE) and the characteristics of these assays were compared. The results showed that a total of 53 strains of C. coli were isolated from chicken and duck samples in three markets. All isolates were clustered into 31, 33, and 15 different patterns with Simpson's index of diversity (SID) values of 0.972, 0.974, and 0.919, respectively. Sau-PCR assay was simpler, more rapid, and had higher discriminatory power than PFGE assay. Fla-DGGE assay could detect and illustrate the number of contamination types of C. jejuni and C. coli without cultivation, which saved more time and cost than Sau-PCR and PFGE assays. Therefore, Sau-PCR and fla-DGGE assays are both rapid, economical, and easy to perform, which have the potential to be promising and accessible for primary laboratories in genotyping C. coli strains.


Assuntos
Campylobacter coli , Animais , Campylobacter coli/genética , Eletroforese em Gel de Campo Pulsado , Flagelina/genética , Genótipo , Aves Domésticas , Reação em Cadeia da Polimerase
15.
Pharm Stat ; 22(1): 79-95, 2023 01.
Artigo em Inglês | MEDLINE | ID: mdl-36054538

RESUMO

We propose a model selection criterion for correlated survival data when the cluster size is informative to the outcome. This approach, called Resampling Cluster Survival Information Criterion (RCSIC), uses the Cox proportional hazards model that is weighted with the inverse of the cluster size. The RCSIC based on the within-cluster resampling idea takes into account the possible variability of the within-cluster subsampling and the possible informativeness of cluster sizes. The RCSIC allows for easy execution for the within-cluster resampling idea without a large number of resamples of the data. In contrast with the traditional model selection method in survival analysis, the RCSIC has an additional penalization for the within-cluster subsampling variability. Our simulations show the satisfactory results where the RCSIC provides a more robust power for variable selection in terms of clustered survival analysis, regardless of whether informative cluster size exists or not. Applying the RCSIC method to a periodontal disease studies, we identify the tooth loss in patients associated with the risk factors, Age, Filled Tooth, Molar, Crown, Decayed Tooth, and Smoking Status, respectively.


Assuntos
Análise por Conglomerados , Humanos , Modelos de Riscos Proporcionais , Análise de Sobrevida , Fatores de Risco , Simulação por Computador
16.
Nano Lett ; 22(13): 5575-5583, 2022 07 13.
Artigo em Inglês | MEDLINE | ID: mdl-35763414

RESUMO

Synthetic biology has promoted the development of microbial therapy, but the scope of applicable microbial species is limited and transgenic microorganisms also display safety risks for in vivo applications. Interestingly, symbiotic microorganisms in nature can achieve functional updates by metabolic cooperation. Here, we report on a nongenetic method for engineering microorganisms to construct a heavy metal ion reduction system, which was prepared by linking Shewanella oneidensis MR-1 (SO) and Lactobacillus rhamnosus GG (LGG). SO could reduce metal ions but is limited by finite substrates in vivo. LGG could metabolize glucose to lactate as a substrate for SO, promoting extracellular electron transfer by SO and heavy metal ion reduction. Meanwhile, SO could generate electron donor cytochrome C to promote metabolism of LGG, forming metabolic synergy and circulation between these two bacteria. The SO-LGG system shows splendid ability to remove heavy metal ions and inflammatory modulation in acute or chronic heavy metal poisoning.


Assuntos
Metais Pesados , Shewanella , Transporte de Elétrons , Íons
17.
Molecules ; 28(14)2023 Jul 14.
Artigo em Inglês | MEDLINE | ID: mdl-37513270

RESUMO

The activation of innate antiviral immunity is a promising approach for combatting viral infections. In this study, we screened Chinese herbs that activated human immunity and identified coptisine as a potent inhibitor of the influenza virus with an EC50 of 10.7 µM in MDCK cells. The time of an addition assay revealed that pre-treatment with coptisine was more effective at reducing viral replication than co-treatment or post-treatment. Our bulk RNA-sequencing data showed that coptisine upregulated the p21 signaling pathway in MDCK cells, which was responsible for its antiviral effects. Specifically, coptisine increased the expression of p21 and FOXO1 in a dose-dependent manner while leaving the MELK expression unchanged. Docking analysis revealed that coptisine likely inhibited MELK activity directly by forming hydrogen bonds with ASP-150 and GLU-87 in the catalytic pocket. These findings suggest that coptisine may be a promising antiviral agent that regulates the p21 signaling pathway to inhibit viral replication.


Assuntos
Berberina , Influenza Humana , Humanos , Influenza Humana/tratamento farmacológico , Antivirais/farmacologia , Antivirais/uso terapêutico , Berberina/farmacologia , Replicação Viral , Proteínas Serina-Treonina Quinases
18.
Pharm Biol ; 61(1): 362-371, 2023 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-36740871

RESUMO

CONTEXT: Kazinol B (KB), an isoprenylated flavan derived from Broussonetia kazinoki Sieb. (Moraceae) root, has long been used in folk medicine. OBJECTIVE: This study examines the protective effects of KB and its underlying mechanisms in hypoxia and reoxygenation (H/R)-induced cardiac injury in H9c2 rat cardiac myoblasts. MATERIALS AND METHODS: H9c2 cells were incubated with various concentrations of KB (0, 0.3, 1, 3, 10 and 30 µM) for 2 h and then subjected to H/R insults. The protective effects of KB and its underlying mechanisms were explored. RESULTS: KB significantly elevated cell viability (1 µM, 1.21-fold; 3 µM, 1.36-fold, and 10 µM, 1.47-fold) and suppressed LDH release (1 µM, 0.77-fold; 3 µM, 0.68-fold, and 10 µM, 0.59-fold) in H/R-induced H9c2 cells. Further, 10 µM KB blocked apoptotic cascades, as shown by the Annexin-V/PI (0.41-fold), DNA fragmentation (0.51-fold), caspase-3 (0.52-fold), PARP activation (0.27-fold) and Bax/Bcl-2 expression (0.28-fold) assays. KB (10 µM) downregulated reactive oxygen species production (0.51-fold) and lipid peroxidation (0.48-fold); it upregulated the activities of GSH-Px (2.08-fold) and SOD (1.72-fold). KB (10 µM) induced Nrf2 nuclear accumulation (1.94-fold) and increased ARE promoter activity (2.15-fold), HO-1 expression (3.07-fold), AKT (3.07-fold) and AMPK (3.07-fold) phosphorylation. Nrf2 knockdown via using Nrf2 siRNA abrogated KB-mediated protective effects against H/R insults. Moreover, pharmacological inhibitors of AKT and AMPK also abrogated KB-induced Nrf2 activation and its protective function. DISCUSSION AND CONCLUSIONS: KB prevented H/R-induced cardiomyocyte injury via modulating the AKT and AMPK-mediated Nrf2 induction. KB might be a promising drug candidate for managing ischemic cardiac disorders.


Assuntos
Miócitos Cardíacos , Proteínas Proto-Oncogênicas c-akt , Ratos , Animais , Proteínas Proto-Oncogênicas c-akt/metabolismo , Fator 2 Relacionado a NF-E2/metabolismo , Proteínas Quinases Ativadas por AMP/metabolismo , Hipóxia/tratamento farmacológico , Hipóxia/metabolismo , Apoptose , Estresse Oxidativo
19.
Hu Li Za Zhi ; 70(1): 48-59, 2023 Feb.
Artigo em Chinês | MEDLINE | ID: mdl-36647310

RESUMO

BACKGROUND: Brain tumors are mainly treated with surgery. However, patients still experience many symptoms and nursing needs due to disease and treatment-related factors that, if not improved in a timely manner, may result in depression. PURPOSE: The purpose of this study was to examine the effectiveness of supportive caring on symptom distress, nursing needs, and depressive symptoms in patients with brain tumor after surgery. METHODS: This study adopted a two-group, pre- and post-test experimental design. The enrolled participants were randomized into two groups. Those in the experimental group received a phone-based supportive caring intervention twice at 1 and 3 months after surgery. Those in the control group received usual discharge care. The measurement outcomes included a supportive care needs survey, symptom distress scales, and the center for epidemiological studies of depression. Baseline data was collected prior to hospital discharge (T0), with follow-up data collected at one month (T1), three months (T2), and six months (T3) after surgery. RESULTS: The results of the generalized estimating equation analysis showed that nursing needs in the experimental group at T1 (ß = -23.61, p < .001), T2 (ß = -22.51, p < .001), and T3 (ß = -22.26, p < .001) were significant lower than in the control group. Also, symptom distress in the experimental group at T1 (ß = -7.03, p = .019) and T2 (ß = -8.39, p = .003) was significantly lower than in the control group. However, depressive symptoms in the experimental group were lower than in the control group only at T2 (ß = -8.55, p = .005). CONCLUSIONS: The results of this study confirm that supportive care helps improve nursing needs, symptoms distress, and depressive symptoms in patients with brain tumor after surgery. Medical team members should pay attention to these issues following surgery.


Assuntos
Neoplasias Encefálicas , Depressão , Humanos , Depressão/diagnóstico , Pacientes , Neoplasias Encefálicas/cirurgia , Qualidade de Vida
20.
Hu Li Za Zhi ; 70(5): 54-65, 2023 Oct.
Artigo em Chinês | MEDLINE | ID: mdl-37740265

RESUMO

BACKGROUND: Approximately 70% of postpartum women in Taiwan choose postpartum care institutions for their postpartum confinement. However, few studies have explored the follow-up relationship between confinement location and, respectively, maternal psychological and role adaptation. PURPOSE: To explore the differences in psychology and maternal role adaptation between postpartum women in two different confinement locations and to analyze the predictors of maternal confidence and maternal competence at six-months postpartum. METHODS: A comparative and follow-up research design was adopted. We recruited a convenience sample of two groups of women confined, respectively, at postpartum nursing centers and at home. One hundred fifty-seven mothers recruited after G-power estimation were enrolled as participants and completed demographic data and six scales at one-week, one-month, and six-months postpartum. The statistical analysis was performed mainly using generalized estimating equations. RESULTS: For all participants, maternal confidence was positively associated with time, being multipara, having religious beliefs, and having better mother-infant bonding (p < .05). In addition, being confined at home, being unemployed, having religious beliefs, perceiving lower levels of stress and depression, having better sleep quality, and having better mother-infant bonding were associated with higher maternal competence (p < .05). CONCLUSIONS / IMPLICATIONS FOR PRACTICE: Based on the findings of this study, postpartum nursing institutions should actively promote strategies to improve maternal competence to help mothers staying in postpartum nursing centers strike an optimal balance between recuperation and parenting preparation. Furthermore, obstetric health professionals should implement policies related to mother-infant bonding to increase maternal confidence and competence and, subsequently, facilitate maternal role adjustment.


Assuntos
Depressão Pós-Parto , Relações Mãe-Filho , Lactente , Gravidez , Feminino , Humanos , Seguimentos , Mães/psicologia , Período Pós-Parto , Poder Familiar/psicologia , Depressão Pós-Parto/psicologia
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