Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 317
Filtrar
Más filtros

Base de datos
Tipo del documento
Intervalo de año de publicación
1.
Artículo en Inglés | MEDLINE | ID: mdl-38849114

RESUMEN

OBJECTIVES: Hypervirulent carbapenem-resistant Klebsiella pneumoniae (hv-CRKp) poses a significant threat to public health. This study reports an infection related to hv-CRKp in a premature infant and reveals its colistin resistance and evolutionary mechanisms within the host. METHODS: Three KPC-producing CRKp strains were isolated from a patient with sepsis and CRKp osteoarthritis who had been receiving colistin antimicrobial therapy. The minimum inhibitory concentrations (MICs) of Ceftazidime,Ceftazidime-Avibactam(CAZ-AVI),Meropenem,Imipenem,Tigecycline,Amikacin,Minocycline,Sulfamethoxazole/Trimethoprim,Ciprofloxacin,Levofloxacin,Aztreonam,Cefepime,Cefoperazone/Sulbactam,Piperacillin/Tazobactam and colistin were determined using the microbroth dilution method.The whole-genome sequencing analysis was conducted to determine the STs, virulence genes, and antibiotic resistance genes of three CRKp strains. RESULTS: Whole-genome sequencing revealed that all three CRKp strains belonged to the sequence type (ST) 11 clone and carried a plasmid encoding blaKPC-2. The three strains all possessed the iucABCDiutA virulence cluster, peg-344 gene, and rmpA/rmpA2 genes, defining them as hv-CRKp. Further experiments and whole-genome analysis revealed that a strain of Kp has developed resistance to colistin. The mechanism found to be responsible for the colistin resistance was a deletion mutation of approximately 9000 bp including mgrB gene. CONCLUSION: This study characterizes the colistin resistance of ST11 clone hv-CRKp during colistin treatment and its rapid evolution within the host.

2.
Clin Lung Cancer ; 2024 May 29.
Artículo en Inglés | MEDLINE | ID: mdl-38879394

RESUMEN

BACKGROUND: The ADAURA trial confirmed adjuvant Osimertinib's efficacy in EGFR-mutated Non-small-cell lung cancer (NSCLC), yet the limited mature overall survival (OS) data at approval poses a challenge. This study explores patient preferences in the absence of complete OS information, hypothesizing that disease-free survival (DFS) benefit alone may influence adjuvant Osimertinib pursuit. METHODS: At Roswell Park Comprehensive Cancer Center (Jan-Dec 2021), patients assessed for adjuvant therapy received a survey probing OS and DFS preferences. Scenarios were (a) minimum OS justifying Osimertinib, (b) minimum DFS improvement justifying 3-years of adjuvant Osimertinib, (c) minimum 5-year DFS percent change, and (d) minimum OS justifying copay changes. Results were analyzed. RESULTS: Of 524 NSCLC patients, 51 participated. Scenario 1 saw 56% requiring a 12-month OS benefit for Osimertinib justification. In scenario 2, 72% deemed a 12-month DFS benefit sufficient. Scenario 3 revealed 31% opting out despite a 10% OS increase. Scenario 4 showed varied willingness to pay, with 33% unwilling to any shoulder copayment even with a 10-year OS benefit. CONCLUSION: This study explores patient preferences without complete OS data, revealing diverse thresholds. Factors include employment, education, and willingness to pay. Findings underscore shared decision-making importance. Limitations include sample size, potential biases, and regional focus; larger cohorts are needed for validation.

4.
Org Lett ; 26(24): 5196-5201, 2024 Jun 21.
Artículo en Inglés | MEDLINE | ID: mdl-38858221

RESUMEN

A novel strategy for incorporating a trifluoroacetyl functionality into a range of structurally varied unsaturated bonds was developed by using PhI(OCOMe)2 as an oxidant with a masked trifluoroacyl reagent as a trifluoroacetyl radical precursor. The oxidative decarboxylation of the masked trifluoroacyl precursor followed by a tandem radical process provides versatile access to 5-exo-trig cyclization of N-arylacrylamides, direct C(sp2)-H trifluoroacetylation of quinolines, isoquinoline, 2H-indazole, and quinoxalin-2(1H)-ones, and C(sp)-H trifluoroacetylation of alkynes. This protocol is characterized by mild reaction conditions, operational simplicity, and broad functional group compatibility.

5.
Water Res ; 259: 121850, 2024 Aug 01.
Artículo en Inglés | MEDLINE | ID: mdl-38851109

RESUMEN

Iron (Fe0, Fe (II), and Fe (III)) has been previously documented to upregulate the expression of key genes, enhancing the production of volatile fatty acids (VFAs) to achieve waste/wastewater resource recovery. However, the precise mechanism by why iron influences gene expression remains unclear. This study applied iron-assisted fermentation systems to explore the behind enhancing mechanism by constructing regulon networks among genes, microbes, and transcription factors. In iron-conditioned systems, a significant enhancement in VFAs production and upregulation of genes expression (1.19-3.92 folds) related to organic conversion and the electron transfer chain was observed. Besides, gene co-expression network and Procrustes analysis identified ten hub transcription factors (e.g., arsR, crp, iscR, perR) and their major contributors (genus) (e.g., Paludibacter, Acinetobacter, Tolumonas). Further analysis suggested that most of hub transcription factors were implicated in iron homeostasis regulation, which speculated that the induced iron homeostasis transcription factors probably effectively regulated the expression of genes encoding enzymes involving in VFAs production and electron transfer of functional microbes, in the case of Paludibacter, Acinetobacter, and Tolumonas while regulating the iron homeostasis, resulting in the efficient production of VFAs in iron-conditioned systems. This study might contribute to an enhanced understanding of the underlying genetic mechanisms by why iron influences gene expression regulation of microbes, which also provides a genetic theoretical basis for improving system VFAs production and resource recovery.


Asunto(s)
Ácidos Grasos Volátiles , Fermentación , Hierro , Factores de Transcripción , Hierro/metabolismo , Factores de Transcripción/metabolismo , Factores de Transcripción/genética , Ácidos Grasos Volátiles/metabolismo , Homeostasis , Regulación Bacteriana de la Expresión Génica , Bacterias/metabolismo , Bacterias/genética
6.
Clin Nutr ; 43(7): 1816-1831, 2024 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-38870662

RESUMEN

BACKGROUND: Optical atrophy 1 (OPA1), a protein accountable for mitochondrial fusion, facilitates the restoration of mitochondrial structure and function following cerebral ischemia/reperfusion (I/R) injury. The OPA1-conferred mitochondrial protection involves its expression and activity, which can be improved by SIRT3 in non-cerebral ischemia. Nevertheless, it remains obscure whether SIRT3 enhances the expression and activity of OPA1 after cerebral I/R injury. METHODS: Mature male Sprague Dawley rats were intracranially injected with adeno-associated viral-Sirtuin-3(AAV-SIRT3) and AAV-sh_OPA1, followed by a 90-min temporary blockage of the middle cerebral artery and subsequent restoration of blood flow. Cultured cortical neurons of rats were transfected with LV-SIRT3 or LV-sh_OPA1 before a 2-h oxygen-glucose deprivation and reoxygenation. The rats and neurons were subsequently treated with a selective OPA1 activity inhibitor (MYLS22). The interaction between SIRT3 and OPA1 was assessed by molecular dynamics simulation technology and co-immunoprecipitation. The expression, function, and specific protective mechanism of SIRT3 were examined by various analyses. RESULTS: SIRT3 interacted with OPA1 in the rat cerebral cortex before and after cerebral I/R. After cerebral I/R damage, SIRT3 upregulation increased the OPA1 expression, which enhanced deacetylation and OPA1 activity, thus alleviating cerebral infarct volume, neuronal apoptosis, oxidative pressure, and impairment in mitochondrial energy production; SIRT3 upregulation also improved neuromotor performance, repaired mitochondrial ultrastructure and membrane composition, and promoted the mitochondrial biogenesis. These neuroprotective effects were partly reversed by OPA1 expression interference and OPA1 activity inhibitor MYLS22. CONCLUSION: In rats, SIRT3 enhances the expression and activity of OPA1, facilitating the repair of mitochondrial structure and functional recovery following cerebral I/R injury. These findings highlight that regulating SIRT3 may be a promising therapeutic strategy for ischemic stroke.


Asunto(s)
GTP Fosfohidrolasas , Accidente Cerebrovascular Isquémico , Mitocondrias , Ratas Sprague-Dawley , Sirtuina 3 , Animales , Masculino , GTP Fosfohidrolasas/metabolismo , GTP Fosfohidrolasas/genética , Sirtuina 3/metabolismo , Sirtuina 3/genética , Ratas , Mitocondrias/metabolismo , Accidente Cerebrovascular Isquémico/metabolismo , Neuronas/metabolismo , Daño por Reperfusión/metabolismo , Modelos Animales de Enfermedad , Recuperación de la Función , Sirtuinas
7.
Cell Rep ; 43(6): 114351, 2024 Jun 25.
Artículo en Inglés | MEDLINE | ID: mdl-38923465

RESUMEN

Klebsiella pneumoniae carbapenemase (KPC) poses a major public health risk. Understanding its transmission dynamics requires examining the epidemiological features of related plasmids. Our study compiled 15,660 blaKPC-positive isolates globally over the past two decades. We found extensive diversity in the genetic background of KPC, with 23 Tn4401-related and 341 non-Tn4401 variants across 163 plasmid types in 14 genera. Intra-K. pneumoniae and cross-genus KPC transmission patterns varied across four distinct periods. In the initial periods, plasmids with narrow host ranges gradually established a survival advantage. In later periods, broad-host-range plasmids became crucial for cross-genera transmission. In total, 61 intra-K. pneumoniae and 66 cross-genus transmission units have been detected. Furthermore, phylogenetic reconstruction dated the origin of KPC transmission back to 1991 and revealed frequent exchanges across countries. Our research highlights the frequent and transient spread events of KPC mediated by plasmids across multiple genera and offers theoretical support for high-risk plasmid monitoring.


Asunto(s)
Proteínas Bacterianas , Klebsiella pneumoniae , Filogenia , Plásmidos , beta-Lactamasas , Plásmidos/genética , Plásmidos/metabolismo , beta-Lactamasas/genética , beta-Lactamasas/metabolismo , Klebsiella pneumoniae/genética , Proteínas Bacterianas/genética , Proteínas Bacterianas/metabolismo , Humanos , Infecciones por Klebsiella/transmisión , Infecciones por Klebsiella/microbiología , Infecciones por Klebsiella/epidemiología
8.
Cell Biol Toxicol ; 40(1): 31, 2024 May 20.
Artículo en Inglés | MEDLINE | ID: mdl-38767771

RESUMEN

Mitochondrial dysfunction contributes to cerebral ischemia-reperfusion (CI/R) injury, which can be ameliorated by Sirtuin-3 (SIRT3). Under stress conditions, the SIRT3-promoted mitochondrial functional recovery depends on both its activity and expression. However, the approach to enhance SIRT3 activity after CI/R injury remains unelucidated. In this study, Sprague-Dawley (SD) rats were intracranially injected with either adeno-associated viral Sirtuin-1 (AAV-SIRT1) or AAV-sh_SIRT1 before undergoing transient middle cerebral artery occlusion (tMCAO). Primary cortical neurons were cultured and transfected with lentiviral SIRT1 (LV-SIRT1) and LV-sh_SIRT1 respectively before oxygen-glucose deprivation/reoxygenation (OGD/R). Afterwards, rats and neurons were respectively treated with a selective SIRT3 inhibitor, 3-(1H-1,2,3-triazol-4-yl) pyridine (3-TYP). The expression, function, and related mechanism of SIRT1 were investigated by Western Blot, flow cytometry, immunofluorescence staining, etc. After CI/R injury, SIRT1 expression decreased in vivo and in vitro. The simulation and immune-analyses reported strong interaction between SIRT1 and SIRT3 in the cerebral mitochondria before and after CI/R. SIRT1 overexpression enhanced SIRT3 activity by increasing the deacetylation of SIRT3, which ameliorated CI/R-induced cerebral infarction, neuronal apoptosis, oxidative stress, neurological and motor dysfunction, and mitochondrial respiratory chain dysfunction, promoted mitochondrial biogenesis, and retained mitochondrial integrity and mitochondrial morphology. Meanwhile, SIRT1 overexpression alleviated OGD/R-induced neuronal death and mitochondrial bioenergetic deficits. These effects were reversed by AAV-sh_SIRT1 and the neuroprotective effects of SIRT1 were partially offset by 3-TYP. These results suggest that SIRT1 restores the structure and function of mitochondria by activating SIRT3, offering neuroprotection against CI/R injury, which signifies a potential approach for the clinical management of cerebral ischemia.


Asunto(s)
Isquemia Encefálica , Mitocondrias , Neuronas , Ratas Sprague-Dawley , Daño por Reperfusión , Sirtuina 1 , Sirtuina 3 , Animales , Sirtuina 1/metabolismo , Sirtuina 1/genética , Daño por Reperfusión/metabolismo , Daño por Reperfusión/patología , Mitocondrias/metabolismo , Masculino , Sirtuina 3/metabolismo , Sirtuina 3/genética , Neuronas/metabolismo , Neuronas/patología , Ratas , Isquemia Encefálica/metabolismo , Isquemia Encefálica/patología , Infarto de la Arteria Cerebral Media/metabolismo , Infarto de la Arteria Cerebral Media/patología , Apoptosis , Sirtuinas
9.
Foods ; 13(10)2024 May 16.
Artículo en Inglés | MEDLINE | ID: mdl-38790856

RESUMEN

Harvested wampee fruit is susceptible to disease, resulting in postharvest losses. Acidic electrolyzed water (AEW), a safe and innovative sterilization technology, plays a role in enhancing disease resistance in harvested produce. In this study, the efficacy of AEW in delaying wampee disease development was assessed, along with its association with disease resistance metabolism. Wampee fruit was treated with AEW (pH 2.5) at different available chlorine concentrations (ACCs) (20, 40, 60, and 80 mg/L) and subsequently stored at 25 °C for 8 days. Results revealed that 40 mg/L ACC in AEW (pH 2.5) was most effective in improving the postharvest quality of wampee fruit. Compared with control wampee fruit, those treated with 40 mg/L ACC in AEW exhibited lower incidence of fruit disease, higher pericarp lignin content, and higher activities of pericarp disease resistance enzymes (DREs), such as cinnamate-4-hydroxylase, phenylalanine ammonia-lyase, chitinase, ß-1,3-glucanase, polyphenol oxidase, 4-coumarate CoA ligase, and cinnamyl alcohol dehydrogenase. These results suggested that AEW elevated DRE activities, promoted lignin accumulation, and ultimately enhanced disease resistance, suppressed disease development, and improved storage quality in harvested wampee fruit. Consequently, AEW emerged as a safe technology to mitigate the disease development and enhance the storage quality of harvested wampee fruit.

10.
Scand J Clin Lab Invest ; 84(3): 202-210, 2024 May.
Artículo en Inglés | MEDLINE | ID: mdl-38683948

RESUMEN

Early and differential diagnosis of sepsis is essential to avoid unnecessary antibiotic use and further reduce patient morbidity and mortality. Here, we aimed to identify predictors of sepsis and advance a machine-learning strategy to predict sepsis-induced respiratory tract infection (RTI). Patients with sepsis and RTI were selected via retrospective analysis, and essential population characteristics and laboratory parameters were recorded. To improve the performance of the primary model and avoid over-fitting, a recursive feature elimination with cross-validation (RFECV) strategy was used to screen the optimal subset of biomarkers and construct nine machine-learning models based on this subset; the average accuracy, precision, recall, and F1-score were used for evaluation of the models. We identified 430 patients with sepsis and 686 patients with RTI. A total of 39 features were collected, with 23 features identified for initial model construction. Using the RFECV algorithm, we found that the XGBoost classifier, which only needed to include seven biomarkers, demonstrated the best performance among all prediction models, with an average accuracy of 89.24 ± 2.28, while the Ridge classifier, which included 11 biomarkers, had an average accuracy of only 83.87 ± 4.69. The remaining models had prediction accuracies greater than 88%. We developed nine models for predicting sepsis using a strategy that combined RFECV with machine learning. Among these models, the XGBoost classifier, which included seven biomarkers, showed the best performance and highest accuracy for predicting sepsis and may be a promising tool for the timely identification of sepsis.


Asunto(s)
Algoritmos , Biomarcadores , Aprendizaje Automático , Infecciones del Sistema Respiratorio , Sepsis , Humanos , Sepsis/diagnóstico , Sepsis/sangre , Biomarcadores/sangre , Infecciones del Sistema Respiratorio/diagnóstico , Masculino , Femenino , Anciano , Persona de Mediana Edad , Estudios Retrospectivos
12.
Environ Sci Pollut Res Int ; 31(22): 32519-32537, 2024 May.
Artículo en Inglés | MEDLINE | ID: mdl-38658508

RESUMEN

The transformation of solid wastes from industrial production into effective adsorbents could significantly contribute to wastewater treatment. In this study, after acidizing and burning soft scale (SS) from coal gasification system, two magnetic adsorbents (mag-ASS and mag-BASS) were prepared via the combination of magnetite with ultrasonic, respectively. The treatment effects of mag-ASS and mag-BASS were then investigated for simulated wastewater containing macromolecular organic matter [i.e., methylene blue (MB)] and Ca2+. The results indicated that the pseudo second order kinetic, Elovich, Freundlich, Langmuir and Temkin model could well describe the adsorption behavior of MB and Ca2+ onto mag-ASS and mag-BASS. The maximum adsorption capacities of mag-ASS for MB and mag-BASS for Ca2+ were 600.53 mg/g and 102.54 mg/g, respectively. Surprisingly, the adsorption abilities of mag-ASS for MB and mag-BASS for Ca2+ show significantly higher than the others. The adsorption mechanisms of MB mainly included electrostatic interaction, π-π conjugate interaction and cation exchange, while those of Ca2+ were mainly electrostatic interaction and cation exchange. The diffusion of MB and Ca2+ onto the magnetic adsorbents might be controlled by the combined effects of intraparticle and liquid film diffusion. There was no significant reduction in adsorption capacity after 8 cycles of adsorption and desorption, indicating that SS-based magnetic adsorbents had good recyclability and stability. Moreover, the removal efficiency of mag-BASS for total hardness and total organic carbon in real coal gasification gray water (CGGW) was 82.60 and 64.10%, respectively. The treatment of CGGW and the resource of wastes would significantly promote the reasonable disposal of coal gasification scales.


Asunto(s)
Calcio , Carbón Mineral , Azul de Metileno , Azul de Metileno/química , Adsorción , Calcio/química , Aguas Residuales/química , Cinética , Contaminantes Químicos del Agua/química , Purificación del Agua/métodos
13.
Food Chem ; 447: 138873, 2024 Jul 30.
Artículo en Inglés | MEDLINE | ID: mdl-38452536

RESUMEN

Food-derived angiotensin-converting enzyme-inhibitory (ACE-I) peptides have attracted extensive attention. Herein, the ACE-I peptides from Scomber japonicus muscle hydrolysates were screened, and their mechanisms of action and inhibition stability were explored. The quantitative structure-activity relationship (QSAR) model based on 5z-scale metrics was developed to rapidly screen for ACE-I peptides. Two novel potential ACE-I peptides (LTPFT, PLITT) were predicted through this model coupled with in silico screening, of which PLITT had the highest activity (IC50: 48.73 ± 7.59 µM). PLITT inhibited ACE activity with a mixture of non-competitive and competitive mechanisms, and this inhibition mainly contributed to the hydrogen bonding based on molecular docking study. PLITT is stable under high temperatures, pH, glucose, and NaCl. The zinc ions (Zn2+) and copper ions (Cu2+) enhanced ACE-I activity. The study suggests that the QSAR model is effective in rapidly screening for ACE-I inhibitors, and PLITT can be supplemented in foods to lower blood pressure.


Asunto(s)
Hidrolisados de Proteína , Relación Estructura-Actividad Cuantitativa , Simulación del Acoplamiento Molecular , Hidrolisados de Proteína/farmacología , Hidrolisados de Proteína/química , Péptidos/farmacología , Péptidos/química , Músculos/metabolismo , Iones , Angiotensinas , Peptidil-Dipeptidasa A/metabolismo
14.
Small ; 20(24): e2311561, 2024 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-38546001

RESUMEN

Balancing the rigid backbones and flexible side chains of light-harvesting materials is crucially important to reach optimized intermolecular packing, micromorphology, and thus photovoltaic performance of organic solar cells (OSCs). Herein, based on a distinctive CH-series acceptor platform with 2D conjugation extended backbones, a series of nonfullerene acceptors (CH-6F-Cn) are synthesized by delicately tuning the lengths of flexible side chains from n-octyl to n-amyl. A systemic investigation has revealed that the variation of the side chain's length can not only modulate intermolecular packing modes and crystallinity but also dramatically improve the micromorphology of the active layer and eventual photovoltaic parameters of OSCs. Consequently, the highest PCE of 18.73% can be achieved by OSCs employing D18:PM6:CH-6F-C8 as light-harvesting materials.

15.
Sci Total Environ ; 922: 171339, 2024 Apr 20.
Artículo en Inglés | MEDLINE | ID: mdl-38428595

RESUMEN

Inappropriate sterilization strategies inhibit microalgal growth when culturing microalgae with anaerobic digestate. This study aimed to scientifically select a low-cost disinfection pretreatment of anaerobic digestate for large-scale microalgae cultivations. In this work, three different methods, including autoclaving, ultraviolet or NaClO treatments, were employed to sterilize the municipal anaerobic digestate. Scenedesmus quadricauda was then cultured in diluted liquid digestate for the simultaneous lipid production and nutrient removal. The results indicated that the growth of S. quadricauda was inhibited after NaClO treatment due to the residual free chlorine. The 15-min ultraviolet effectively mitigated microbial contamination and increasing nutrient availability, enhancing the electron transport of microalgal photosynthesis. After 6-days cultivation, the microalgal biomass concentration of the ultraviolet group was 1.09 g/L, comparable to that of the autoclaving group (1.15 g/L). High nutrient removal efficiency was observed: COD (93.30 %), NH4+-N (92.56 %), TN (85.82 %) and TP (95.12 %). Moreover, S. quadricauda outcompeted the indigenous microorganisms, contributing to its dominance in the culture system of ultraviolet group. The facultative anaerobe Comamonadaceae and aerobes Moraxellaceae, rather than strict anaerobe Paludibacteraceae and Bacteroidetes_vadinHA17, played vital roles in synergistic removal of contaminants by bacteria and algae. The potential competition for nitrogen and phosphorus by bacteria contributed to the ultraviolet group having the greatest lipid content (48.19 %). Therefore, this work suggested using 15-min ultraviolet treatment for anaerobic digestate in large-scale microalgae cultivation.


Asunto(s)
Microalgas , Scenedesmus , Rayos Ultravioleta , Anaerobiosis , Bacterias , Biomasa , Nitrógeno , Bacteroidetes , Lípidos
16.
CNS Neurosci Ther ; 30(3): e14650, 2024 03.
Artículo en Inglés | MEDLINE | ID: mdl-38514905

RESUMEN

AIMS: To explore the pharmacological treatment of vascular depression (VaDep) and whether the blood levels of neurotransmitters can reflect the VaDep severity. METHODS: VaDep patients with somatic symptoms were enrolled and randomly received venlafaxine + tandospirone (Combined Group) or venlafaxine (Monotherapy Group). The treatment efficacy was assessed by Hamilton Depression Scale (HAMD), Hamilton Anxiety Scale (HAMA), and Patient Health Questionnaire-15 (PHQ-15). The levels of blood monoamine neurotransmitters were measured by enzyme-linked immunosorbent assay. RESULTS: Both groups reported a progressive decrease in HAMD, HAMA, and PHQ-15 scores to below the baseline after the respective treatment. Compared with the Monotherapy Group, the Combined Group reported a significant decrease in HAMD score at week 2 and markedly lower HAMA and PHQ-15 scores at weeks 1, 2, 4, and 8. Both groups showed a decrease in the levels of blood monoamine neurotransmitters at weeks 4 and 8 when compared with the baseline. A strong positive association was evident between the plasma 5-HT levels and the HAMD score. CONCLUSION: The combined therapy rapidly acts on VaDep comorbid with anxiety and somatic symptoms and significantly alleviates the anxiety and somatic symptoms. The plasma levels of 5-HT may serve as potential objective candidates in evaluating VaDep severity and the efficacy of the undertaken treatment regimen.


Asunto(s)
Ansiolíticos , Isoindoles , Síntomas sin Explicación Médica , Piperazinas , Pirimidinas , Depresión Vascular , Humanos , Citratos , Depresión/tratamiento farmacológico , Inhibidores Selectivos de la Recaptación de Serotonina , Serotonina , Resultado del Tratamiento , Clorhidrato de Venlafaxina/uso terapéutico , Quimioterapia Combinada/efectos adversos
17.
Molecules ; 29(5)2024 Mar 03.
Artículo en Inglés | MEDLINE | ID: mdl-38474646

RESUMEN

Food-derived angiotensin-I-converting enzyme (ACE)-inhibitory peptides have gained attention for their potent and safe treatment of hypertensive disorders. However, there are some limitations of conventional methods for preparing ACE-inhibitory peptides. In this study, in silico hydrolysis, the quantitative structure-activity relationship (QSAR) model, LC-MS/MS, inhibition kinetics, and molecular docking were used to investigate the stability, hydrolyzability, in vitro activity, and inhibition mechanism of bioactive peptides during the actual hydrolysis process. Six novel ACE-inhibitory peptides were screened from the Larimichthys crocea protein (LCP) and had low IC50 values (from 0.63 ± 0.09 µM to 10.26 ± 0.21 µM), which were close to the results of the QSAR model. After in vitro gastrointestinal simulated digestion activity of IPYADFK, FYEPFM and NWPWMK were found to remain almost unchanged, whereas LYDHLGK, INEMLDTK, and IHFGTTGK were affected by gastrointestinal digestion. Meanwhile, the inhibition kinetics and molecular docking results were consistent in that ACE-inhibitory peptides of different inhibition forms could effectively bind to the active or non-central active centers of ACE through hydrogen bonding. Our proposed method has better reproducibility, accuracy, and higher directivity than previous methods. This study can provide new approaches for the deep processing, identification, and preparation of Larimichthys crocea.


Asunto(s)
Inhibidores de la Enzima Convertidora de Angiotensina , Peptidil-Dipeptidasa A , Inhibidores de la Enzima Convertidora de Angiotensina/química , Simulación del Acoplamiento Molecular , Peptidil-Dipeptidasa A/metabolismo , Cromatografía Liquida , Reproducibilidad de los Resultados , Espectrometría de Masas en Tándem , Péptidos/química , Angiotensinas
18.
Org Lett ; 26(10): 2108-2113, 2024 Mar 15.
Artículo en Inglés | MEDLINE | ID: mdl-38440974

RESUMEN

A metal-free photosensitized 1,2-imino-sulfamoylation of olefins by employing a tailor-made sulfamoyl carbamate as the difunctionalization reagent has been established. This protocol exhibits versatility across a broad substrate scope, including aryl and aliphatic alkenes, leading to the synthesis of diverse ß-imino sulfonamides in moderate to good yields. This method is characterized by its metal-free reaction system, mild reaction conditions, excellent regioselectivity, and high atom economy, serving as a promising platform for the preparation of ß-amino sulfonamide-containing molecules, particularly in the context of drug discovery.

19.
Natl Sci Rev ; 11(3): nwad311, 2024 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-38312386

RESUMEN

Optical communication is a particularly compelling technology for tackling the speed and capacity bottlenecks in data communication in modern society. Currently, the silicon photodetector plays a dominant role in high-speed optical communication across the visible-near-infrared spectrum. However, its intrinsic rigid structure, high working bias and low responsivity essentially limit its application in next-generation flexible optoelectronic devices. Herein, we report a narrow-bandgap non-fullerene acceptor (NFA) with a remarkable π-extension in the direction of both central and end units (CH17) with respect to the Y6 series, which demonstrates a more effective and compact 3D molecular packing, leading to lower trap states and energetic disorders in the photoactive film. Consequently, the optimized solution-processed organic photodetector (OPD) with CH17 exhibits a remarkable response time of 91 ns (λ = 880 nm) due to the high charge mobility and low parasitic capacitance, exceeding the values of most commercial Si photodiodes and all NFA-based OPDs operating in self-powered mode. More significantly, the flexible OPD exhibits negligible performance attenuation (<1%) after bending for 500 cycles, and maintains 96% of its initial performance even after 550 h of indoor exposure. Furthermore, the high-speed OPD demonstrates a high data transmission rate of 80 MHz with a bit error rate of 3.5 [Formula: see text] 10-4, meaning it has great potential in next-generation high-speed flexible optical communication systems.

20.
Sci Bull (Beijing) ; 69(7): 968-977, 2024 Apr 15.
Artículo en Inglés | MEDLINE | ID: mdl-38331705

RESUMEN

Lake-effect snowfall (LES) occurs when cold air moves across open lakes. LES is expected to occur more frequently over the TP, due to the intensified lake expansion caused by intensified global warming. Thus, there is an urgent need to comprehensively assess the LES over the TP. Here, we revealed that the LES is triggered by westerly southward shift leading to the drop in air temperature and is positively correlated with lake area, wind speed and longitude across 12 large lakes (>300 km2) based on satellite observations and reanalysis data. Using a sensitivity model simulation, we determined that large lakes in the southern TP contributed to more than 50% of the snowfall in the downwind area in 2013. Projections indicate that the westerly-triggered LES will increase under the future RCP4.5 climate warming scenario, highlighting the importance of developing adaptive policies to address the growing risks associated with future LES.

SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA