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1.
Hum Brain Mapp ; 45(2): e26575, 2024 Feb 01.
Artículo en Inglés | MEDLINE | ID: mdl-38339909

RESUMEN

Functional signals emerge from the structural network, supporting multiple cognitive processes through underlying molecular mechanism. The link between human brain structure and function is region-specific and hierarchical across the neocortex. However, the relationship between hierarchical structure-function decoupling and the manifestation of individual behavior and cognition, along with the significance of the functional systems involved, and the specific molecular mechanism underlying structure-function decoupling remain incompletely characterized. Here, we used the structural-decoupling index (SDI) to quantify the dependency of functional signals on the structural connectome using a significantly larger cohort of healthy subjects. Canonical correlation analysis (CCA) was utilized to assess the general multivariate correlation pattern between region-specific SDIs across the whole brain and multiple cognitive traits. Then, we predicted five composite cognitive scores resulting from multivariate analysis using SDIs in primary networks, association networks, and all networks, respectively. Finally, we explored the molecular mechanism related to SDI by investigating its genetic factors and relationship with neurotransmitter receptors/transporters. We demonstrated that structure-function decoupling is hierarchical across the neocortex, spanning from primary networks to association networks. We revealed better performance in cognition prediction is achieved by using high-level hierarchical SDIs, with varying significance of different brain regions in predicting cognitive processes. We found that the SDIs were associated with the gene expression level of several receptor-related terms, and we also found the spatial distributions of four receptors/transporters significantly correlated with SDIs, namely D2, NET, MOR, and mGluR5, which play an important role in the flexibility of neuronal function. Collectively, our findings corroborate the association between hierarchical macroscale structure-function decoupling and individual cognition and provide implications for comprehending the molecular mechanism of structure-function decoupling. PRACTITIONER POINTS: Structure-function decoupling is hierarchical across the neocortex, spanning from primary networks to association networks. High-level hierarchical structure-function decoupling contributes much more than low-level decoupling to individual cognition. Structure-function decoupling could be regulated by genes associated with pivotal receptors that are crucial for neuronal function flexibility.


Asunto(s)
Conectoma , Neocórtex , Fenómenos Fisiológicos del Sistema Nervioso , Humanos , Imagen por Resonancia Magnética/métodos , Cognición/fisiología , Encéfalo/fisiología , Conectoma/métodos , Neocórtex/diagnóstico por imagen
2.
Vet Res ; 55(1): 83, 2024 Jun 28.
Artículo en Inglés | MEDLINE | ID: mdl-38943190

RESUMEN

Migratory birds are important vectors for virus transmission, how migratory birds recognize viruses and viruses are sustained in birds is still enigmatic. As an animal model for waterfowl among migratory birds, studying and dissecting the antiviral immunity and viral evasion in duck cells may pave a path to deciphering these puzzles. Here, we studied the mechanism of antiviral autophagy mediated by duck STING in DEF cells. The results collaborated that duck STING could significantly enhance LC3B-II/I turnover, LC3B-EGFP puncta formation, and mCherry/EGFP ratio, indicating that duck STING could induce autophagy. The autophagy induced by duck STING is not affected by shRNA knockdown of ATG5 expression, deletion of the C-terminal tail of STING, or TBK1 inhibitor BX795 treatment, indicating that duck STING activated non-classical selective autophagy is independent of interaction with TBK1, TBK1 phosphorylation, and interferon (IFN) signaling. The STING R235A mutant and Sar1A/B kinase mutant abolished duck STING induced autophagy, suggesting binding with cGAMP and COPII complex mediated transport are the critical prerequisite. Duck STING interacted with LC3B through LIR motifs to induce autophagy, the LIR 4/7 motif mutants of duck STING abolished the interaction with LC3B, and neither activated autophagy nor IFN expression, indicating that duck STING associates with LC3B directed autophagy and dictated innate immunity activation. Finally, we found that duck STING mediated autophagy significantly inhibited duck plague virus (DPV) infection via ubiquitously degraded viral proteins. Our study may shed light on one scenario about the control and evasion of diseases transmitted by migratory birds.


Asunto(s)
Autofagia , Patos , Transducción de Señal , Animales , Mardivirus/fisiología , Interferones/metabolismo , Alphaherpesvirinae/fisiología , Inmunidad Innata , Proteínas de la Membrana/metabolismo , Proteínas de la Membrana/genética , Infecciones por Poxviridae/veterinaria , Infecciones por Poxviridae/inmunología , Infecciones por Poxviridae/virología
3.
Cereb Cortex ; 33(14): 9165-9174, 2023 07 05.
Artículo en Inglés | MEDLINE | ID: mdl-37310142

RESUMEN

It has been proved that unilateral hearing loss (UHL) can cause functional connectivity alterations in adults. However, the mechanism of the human brain coping with the challenge of unilateral hearing deprivation at very early developmental phases remains poorly understood. Here, we performed a resting-state functional near-infrared spectroscopy (fNIRS) study on 3- to 10-month-old infants with varying degrees of unilateral hearing loss to investigate the effect of unilateral auditory deprivation in infants. Using network-based statistics, increased functional connectivity was observed in single-sided deafness (SSD) compared with normal hearing infants, and the right middle temporal gyrus was the most involved nodes. In addition, changes in cortical function in infants were related to the degree of hearing loss, with significantly increased functional connectivity in infants with severe to profound unilateral hearing loss compared with the ones with mild to moderate. Moreover, more significant cortical functional recombination changes were found in right-SSD than in left-SSD infants. For the first time, our study provides evidence for the effects of unilateral hearing deprivation on the early cortical development of the human brain, which would also act as a reference for intervention decisions in children with unilateral hearing loss in clinical settings.


Asunto(s)
Pérdida Auditiva Unilateral , Pérdida Auditiva , Adulto , Niño , Humanos , Lactante , Pérdida Auditiva Unilateral/diagnóstico por imagen , Encéfalo , Mapeo Encefálico , Tiempo
4.
Calcif Tissue Int ; 112(3): 363-376, 2023 03.
Artículo en Inglés | MEDLINE | ID: mdl-36566445

RESUMEN

Osteoarthritis (OA) is a major health problem, characterized by progressive cartilage degeneration. Previous works have shown that mechanical loading can alleviate OA symptoms by suppressing catabolic activities. This study evaluated whether mechanical loading can enhance anabolic activities by facilitating the recruitment of stem cells for chondrogenesis. We evaluated cartilage degradation in a mouse model of OA through histology with H&E and safranin O staining. We also evaluated the migration and chondrogenic ability of stem cells using in vitro assays, including immunohistochemistry, immunofluorescence, and Western blot analysis. The result showed that the OA mice that received mechanical loading exhibited resilience to cartilage damage. Compared to the OA group, mechanical loading promoted the expression of Piezo1 and the migration of stem cells was promoted via the SDF-1/CXCR4 axis. Also, the chondrogenic differentiation was enhanced by the upregulation of SOX9, a transcription factor important for chondrogenesis. Collectively, the results revealed that mechanical loading facilitated cartilage repair by promoting the migration and chondrogenic differentiation of endogenous stem cells. This study provided new insights into the loading-driven engagement of endogenous stem cells and the enhancement of anabolic responses for the treatment of OA.


Asunto(s)
Condrogénesis , Osteoartritis , Ratones , Animales , Condrogénesis/fisiología , Cartílago/patología , Células Madre/metabolismo , Diferenciación Celular , Osteoartritis/metabolismo , Condrocitos/metabolismo , Células Cultivadas , Canales Iónicos/metabolismo
5.
J Craniofac Surg ; 34(2): 834-838, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-36745106

RESUMEN

The authors browsed through past genetic findings in hemifacial microsomia along with our previously identified mutations in ITGB4 and PDE4DIP from whole genome sequencing of hemifacial microsomia patients. Wondering whether these genes influence mandibular bone modeling by regulation on osteogenesis, the authors approached mechanisms of hemifacial microsomia through this investigation into gene knockdown effects in vitro. MC3T3E1 cells were divided into 5 groups: the negative control group without osteogenesis induction or siRNA, the positive control group with only osteogenesis induction, and 3 gene silenced groups with both osteogenesis induction and siRNA. Validation of transfection was through fluorescence microscopy and quantitative real-time Polymerase chain reaction on knockdown efficiency. Changes in expression levels of the 3 genes during osteogenesis and impact of Itgb4 and Pde4dip knockdown on osteogenesis were examined by quantitative real-time Polymerase chain reaction, alkaline phosphatase, and alizarin red staining. Elevation of osteogenic genes Alpl, Col1a1, Bglap, Spp1, and Runx2 verified successful osteogenesis. Both genes were upregulated under osteogenic induction, while they had different trends over time. Intracellular fluorophores under microscope validated successful transfection and si-m-Itgb4_003, si-m-Pde4dip_002 had satisfactory knockdown effects. During osteogenesis, Pde4dip knockdown enhanced Spp1 expression (1.95±0.13 folds, P =0.045). The authors speculated that these genes may have different involvements in osteogenesis. Stimulated expression of Spp1 by Pde4dip knockdown may suggest that Pde4dip inhibits osteogenesis.


Asunto(s)
Síndrome de Goldenhar , Humanos , Diferenciación Celular/genética , Relevancia Clínica , Osteogénesis/genética , ARN Interferente Pequeño/genética , ARN Interferente Pequeño/metabolismo , Células Cultivadas
6.
J Craniofac Surg ; 34(2): 575-579, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-36731104

RESUMEN

The authors attempt to approach hemifacial microsomia with macroscopic techniques and look for a link between clinical manifestations with pathogenesis. In this study, for the first time mandibular medullary cavities as essential parts of the mandible were intravitally measured based on the 3-dimensional models. A total of 153 patients were included. The 3-dimensional models of patients' mandibles were reconstructed and medullary cavity volumes (mm 3 ) were measured. The ratio of medullary cavity volume to mandible volume was calculated to determine the proportion of the marrow in the bone. Statistical significance was found in mandible volumes ( P <0.001) and medullary cavity volumes ( P <0.001) on different sides. Medullary cavity volumes were significantly related to mandible volumes on both sides (both P <0.001). Medullary cavity volumes on the nonaffected and affected side were both in correlation with age but in different degrees ( r =0.214, P =0.008 versus r =0.170, P =0.036). The ratios of medullary cavity volume and the mandible were significantly different ( P <0.001) on 2 sides. The volume ratio on the nonaffected side correlated to age while this correlation did not exist on the affected side ( r =0.195, P =0.016 versus r =0.129, P =0.112). A smaller medullary cavity found on the affected side could lead to a reduced amount of bone marrow cells and consequently reduced osteogenic and hematopoietic potential. This could result in abnormal bone formation on the affected side of mandible. Proportions of marrow in bone on the affected side irrelevant to patients' ages signify a poorer potential of expansion. This may explain a higher reluctancy of growth in affected mandibular sides.


Asunto(s)
Síndrome de Goldenhar , Humanos , Mandíbula/patología , Asimetría Facial/patología
7.
J Craniofac Surg ; 34(2): 813-816, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-36730634

RESUMEN

Since our team reported the application of robot-assisted surgery in facial contouring surgery in 2020, further clinical trials with large samples have been conducted. This paper will report the interim results of a single-center, large-sample randomized controlled trial of the first robot developed by our team for facial contouring surgery. Meanwhile, this research field will be systematically reviewed and prospected.


Asunto(s)
Procedimientos Ortopédicos , Procedimientos Quirúrgicos Robotizados , Humanos , Procedimientos Quirúrgicos Robotizados/métodos , Cara , Huesos Faciales
8.
Environ Geochem Health ; 45(6): 3789-3804, 2023 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-36580188

RESUMEN

Chlorinated paraffins (CPs) are ubiquitous anthropogenic contaminants that have been found in various environmental media. The objective of this study was to determine concentrations, spatial distribution, possible sources and potential health risk of SCCPs and MCCPs in urban road dust collected from Shanghai, China. The concentrations ranged from 9.74 to 11,400 ng g-1 for ΣSCCPs, 44.1 to 49,900 ng g-1 for ΣMCCPs and 53.9 to 61,400 ng g-1 for total CPs, respectively. MCCPs were the dominant component in all road dust, averagely accounting for 82.8% of total CPs. The concentrations of CPs in dust collected from traffic and commercial areas were significantly higher than those from campus, industrial, park and residential areas (p < 0.01), which could be attributed to tire wear in heavy traffic. All dust samples were divided into two groups by hierarchical cluster analysis for both SCCPs and MCCPs, and the most abundant homologue groups in most samples were C10Cl7-10 and C13Cl7-9 for SCCPs, and C14Cl7-9 and C15Cl8-9 for MCCPs. Correlation analysis showed that all carbon homologues in road dusts were highly correlated each other, suggesting SCCPs and MCCPs in dust maybe came from similar sources. Three sources for CPs in dust samples were apportioned by the PMF model; their relative contributions to the total CPs burden in dust were 25.6% for factor 1 (commercial CP mixture), 13.7% for factor 2 (long-distance transport) and 60.7% for factor 3 (commercial CP mixture). The median estimated daily intakes of total CPs via road dust were 1.78 × 10-5 for children and 3.0 × 10-6 mg kg-1 day-1 for adults, respectively. Quantitative risk assessment using non-cancer hazard index and total margin of exposure of total CPs indicated that total CPs at the present level in road dust pose no significant risk for both children and adults in Shanghai.


Asunto(s)
Polvo , Hidrocarburos Clorados , Adulto , Niño , Humanos , China , Polvo/análisis , Parafina/análisis , Monitoreo del Ambiente , Hidrocarburos Clorados/análisis
9.
Calcif Tissue Int ; 111(2): 171-184, 2022 08.
Artículo en Inglés | MEDLINE | ID: mdl-35429248

RESUMEN

Osteoarthritis (OA) is a whole joint disorder that is characterized by cartilage damage and abnormal remodeling of subchondral bone. Injecting adipose-derived stem cells (ASCs) into the knee joint cavity can assist in repairing osteoarthritic joints, but their ability to migrate to the damaged site is limited. Our previous studies have shown that knee loading can improve the symptoms of OA, but the effect and mechanism of knee loading on the migration of ASCs in OA remain unclear. We employed a mouse model of OA in the knee and applied knee loading (1 N at 5 Hz for 6 min/day for 2 weeks) after the intra-articular injection of ASCs. The cartilage and subchondral bone repair were assessed by histopathological analysis. Immunofluorescence assays were also used to analyze the migration of ASCs. Using cell cultures, we evaluated the migration of ASCs using the transwell migration and wound healing assays. In vivo experiments showed that knee loading promoted the migration of ASCs, increased the local SDF-1 level, and accelerated the repair of the OA-damaged sites. Mechanistically, the observed effects were blocked by the SDF-1/CXCR4 inhibitor. The in vitro results further revealed that knee loading promoted the migration of ASCs and the inhibition of SDF-1/CXCR4 significantly suppressed the beneficial loading effect. The results herein suggested that the migration of ASCs was enhanced by knee loading through the SDF-1/CXCR4 regulatory axis, and mechanical loading promoted the joint-protective effect of ASCs.


Asunto(s)
Articulación de la Rodilla , Osteoartritis , Tejido Adiposo , Animales , Ratones , Transducción de Señal , Células Madre
10.
FASEB J ; 35(1): e21150, 2021 01.
Artículo en Inglés | MEDLINE | ID: mdl-33161580

RESUMEN

Exosomes are important transporters of miRNAs, which play varying roles in the healing of the bone fracture. Angiogenesis is one of such critical events in bone healing, and we previously reported the stimulatory effect of mechanical loading in vessel remodeling. Focusing on type H vessels and exosomal miR-214-3p, this study examined the mechanism of loading-driven angiogenesis. MiRNA sequencing and qRT-PCR revealed that miR-214-3p was increased in the exosomes of the bone-losing ovariectomized (OVX) mice, while it was significantly decreased by knee loading. Furthermore, compared to the OVX group, exosomes, derived from the loading group, promoted the angiogenesis of endothelial cells. In contrast, exosomes, which were transfected with miR-214-3p, decreased the angiogenic potential. Notably, knee loading significantly improved the microvascular volume, type H vessel formation, and bone mineral density and contents, as well as BV/TV, Tb.Th, Tb.N, and Tb.Sp. In cell cultures, the overexpression of miR-214-3p in endothelial cells reduced the tube formation and cell migration. Collectively, this study demonstrates that knee loading promotes angiogenesis by enhancing the formation of type H vessels and downregulating exosomal miR-214-3p.


Asunto(s)
Células de la Médula Ósea/metabolismo , Exosomas/metabolismo , Articulación de la Rodilla , Células Madre Mesenquimatosas/metabolismo , MicroARNs/metabolismo , Neovascularización Fisiológica , Animales , Exosomas/genética , Femenino , Articulación de la Rodilla/irrigación sanguínea , Articulación de la Rodilla/metabolismo , Ratones , MicroARNs/genética , Soporte de Peso
11.
J Biomed Inform ; 125: 103978, 2022 01.
Artículo en Inglés | MEDLINE | ID: mdl-34922021

RESUMEN

Alzheimer's disease is a common neurodegenerative brain disease that affects the elderly population worldwide. Its early automatic detection is vital for early intervention and treatment. A common solution is to perform future cognitive score prediction based on the baseline brain structural magnetic resonance image (MRI), which can directly infer the potential severity of disease. Recently, several studies have modelled disease progression by predicting the future brain MRI that can provide visual information of brain changes over time. Nevertheless, no studies explore the intra correlation of these two solutions, and it is unknown whether the predicted MRI can assist the prediction of cognitive score. Here, instead of independent prediction, we aim to predict disease progression in multi-view, i.e., predicting subject-specific changes of cognitive score and MRI volume concurrently. To achieve this, we propose an end-to-end integrated framework, where a regression model and a generative adversarial network are integrated together and then jointly optimized. Three integration strategies are exploited to unify these two models. Moreover, considering that some brain regions, such as hippocampus and middle temporal gyrus, could change significantly during the disease progression, a region-of-interest (ROI) mask and a ROI loss are introduced into the integrated framework to leverage this anatomical prior knowledge. Experimental results on the longitudinal Alzheimer's Disease Neuroimaging Initiative dataset demonstrated that the integrated framework outperformed the independent regression model for cognitive score prediction. And its performance can be further improved with the ROI loss for both cognitive score and MRI prediction.


Asunto(s)
Enfermedad de Alzheimer , Anciano , Enfermedad de Alzheimer/diagnóstico por imagen , Encéfalo/diagnóstico por imagen , Progresión de la Enfermedad , Humanos , Imagen por Resonancia Magnética , Neuroimagen
12.
Ophthalmic Res ; 65(6): 712-721, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-35926478

RESUMEN

INTRODUCTION: Crystalline lens is the major dioptric component and varies with refractive status. In this study, we aim to evaluate the changes of dimensions and functions of crystalline lens in high myopia (HM) and its correlated variables using CASIA2 swept-source optical coherence tomography. METHODS: One hundred and thirty eligible eyes of myopic patients from 18 to 40 years old were enrolled and divided into low-to-moderate myopia (LMM) and HM groups according to spherical equivalent (SE). Anterior segment features, including lens thickness (LT), anterior radius of curvature (ARC), posterior radius of curvature (PRC), anterior chamber depth (ACD), and lens tilt were obtained by CASIA2. Lens power was calculated using Bennett's formula. Sixty-seven participants were imaged at the static state and the accommodative state induced by -3 diopter (D) stimulus. RESULTS: Compared to the LMM group, the HM group exhibited a significantly reduction in LT, ARC, and lens tilt (all p < 0.01). Each parameter correlated positively with SE (all p < 0.01). Lens power increased with LT and tilt (r = 0.42, 0.45) but decreased with ARC and axial length (AL) (r = -0.37, -0.62) among highly myopic eyes. Multivariate regression analysis revealed that lower lens power appeared to be independently associated with axial elongation in both groups (LMM: ß = -1.124, p = 0.002; HM: ß = -1.603, p < 0.001, respectively). Decreases in ARC and ACD were accompanied by accommodative response in each group, while PRC reduced during accommodation (p = 0.009) only in HM. CONCLUSIONS: Young adults with HM presented a thinner thickness, smaller tilt, less lens power, and higher accommodative response. Lens shape was closely associated with SE; however, AL was a meaningful indicator of lens power.


Asunto(s)
Cristalino , Tomografía de Coherencia Óptica , Humanos , Adolescente , Adulto Joven , Adulto , Cristalino/diagnóstico por imagen
13.
Neuroimage ; 238: 118252, 2021 09.
Artículo en Inglés | MEDLINE | ID: mdl-34116155

RESUMEN

Resting-state functional connectivity (RSFC) can be used for mapping large-scale human brain networks during rest. There is considerable interest in distinguishing the individual-shared and individual-specific components in RSFC for the better identification of individuals and prediction of behavior. Therefore, we propose a multi-task learning based sparse convex alternating structure optimization (MTL-sCASO) method to decompose RSFC into individual-specific connectivity and individual-shared connectivity. We used synthetic data to validate the efficacy of the MTL-sCASO method. In addition, we verified that individual-specific connectivity achieves higher identification rates than the Pearson correlation (PC) method, and the individual-specific components observed in 886 individuals from the Human Connectome Project (HCP) examined in two sessions over two consecutive days might serve as individual fingerprints. Individual-specific connectivity has low inter-subject similarity (-0.005±0.023), while individual-shared connectivity has high inter-subject similarity (0.822±0.061). We also determined the anatomical locations (region or subsystem) related to individual attributes and common features. We find that individual-specific connectivity exhibits low degree centrality in the sensorimotor processing system but high degree centrality in the control system. Importantly, the individual-specific connectivity estimated by the MTL-sCASO method accurately predicts behavioral scores (improved by 9.4% compared to the PC method) in the cognitive dimension. The decomposition of individual-specific and individual-shared components from RSFC provides a new approach for tracing individual traits and group analysis using functional brain networks.


Asunto(s)
Encéfalo/diagnóstico por imagen , Conectoma , Aprendizaje Automático , Red Nerviosa/diagnóstico por imagen , Adulto , Humanos , Imagen por Resonancia Magnética
14.
Microb Pathog ; 149: 104317, 2020 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-32512153

RESUMEN

INTRODUCTION: Staphylococcus aureus is a common human pathogen that causes various diseases including infections on the skin, in the bloodstream and the lower respiratory tracts. The emergence of methicillin-resistant S. aureus (MRSA) made the treatment of the bacterial infection more difficult, calling for development of new therapeutics. Compared with conventional antibiotic therapy, phage therapy offers a promising alternative to combat infections caused by MRSA. RESULTS: Here we showed that phage VB_SauS_SH-St 15644 isolated from sewage inhibited MRSA isolates in vitro and in the murine skin infection model. Phage VB_SauS_SH-St 15644 belongs to Siphoviridae. The genome of the phage is a linear, 45,111 bp double-stranded DNA with GC content of 33.35%. Among the 37 clinical MRSA isolates tested, 12 (32%) were lysed by the phage in vitro. The phage was relatively stable at temperatures up to 40 °C or between pH 6 and 9. However, the phage was sensitive to UV light. 80% of the phage was approximately adsorbed to the host MRSA isolate in 4 min. The one-step growth curve showed that the latent period was about 12 min followed by the growth period (about 9 min). The burst size was estimated at 13 PFU per infected cell. Furthermore, in a murine skin infection model, the phage significantly inhibited MRSA infection. CONCLUSIONS: Our study suggested that phage VB_SauS_SH-St 15644 has a potential to inhibit MRSA skin infection.


Asunto(s)
Bacteriófagos , Staphylococcus aureus Resistente a Meticilina , Siphoviridae , Infecciones Estafilocócicas , Animales , Bacteriófagos/genética , Humanos , Ratones , Infecciones Estafilocócicas/terapia , Staphylococcus aureus
15.
Molecules ; 24(23)2019 Nov 20.
Artículo en Inglés | MEDLINE | ID: mdl-31757097

RESUMEN

An effective approach for amino protection and construction of a seven-membered ring has been developed. The method uses imidazolium chloride to carry out the Michael addition reaction at low temperatures and perform amino deprotection or construction of a seven-membered ring at high temperatures.


Asunto(s)
Compuestos Heterocíclicos , Imidazoles/química , Compuestos Heterocíclicos/síntesis química , Compuestos Heterocíclicos/química
16.
Molecules ; 24(1)2019 Jan 04.
Artículo en Inglés | MEDLINE | ID: mdl-30621218

RESUMEN

A simple, economical and metal-free approach to the synthesis of 2-substituted benzoxazoles and 2-substituted benzothiazoles from 2-aminophenols, 2-aminothiophenols and DMF derivatives, only using imidazolium chloride (50% mmol) as promoter without any other additive, was reported. Various 2-substituted benzoxazoles and 2-substituted benzothiazoles were thus prepared in moderate to excellent yields.


Asunto(s)
Aminofenoles/química , Benzotiazoles/síntesis química , Benzoxazoles/síntesis química , Compuestos de Anilina/química , Benzotiazoles/química , Benzoxazoles/química , Catálisis , Imidazoles/química , Metales/química , Fenoles/química , Compuestos de Sulfhidrilo/química
17.
Hum Brain Mapp ; 39(5): 2098-2110, 2018 05.
Artículo en Inglés | MEDLINE | ID: mdl-29400420

RESUMEN

Playing music requires a strong coupling of perception and action mediated by multimodal integration of brain regions, which can be described as network connections measured by anatomical and functional correlations between regions. However, the structural and functional connectivities within and between the auditory and sensorimotor networks after long-term musical training remain largely uninvestigated. Here, we compared the structural connectivity (SC) and resting-state functional connectivity (rs-FC) within and between the two networks in 29 novice healthy young adults before and after musical training (piano) with those of another 27 novice participants who were evaluated longitudinally but with no intervention. In addition, a correlation analysis was performed between the changes in FC or SC with practice time in the training group. As expected, participants in the training group showed increased FC within the sensorimotor network and increased FC and SC of the auditory-motor network after musical training. Interestingly, we further found that the changes in FC within the sensorimotor network and SC of the auditory-motor network were positively correlated with practice time. Our results indicate that musical training could induce enhanced local interaction and global integration between musical performance-related regions, which provides insights into the mechanism of brain plasticity in young adults.


Asunto(s)
Percepción Auditiva/fisiología , Encéfalo/fisiología , Aprendizaje/fisiología , Música , Vías Nerviosas/fisiología , Plasticidad Neuronal/fisiología , Desempeño Psicomotor/fisiología , Estimulación Acústica , Adulto , Análisis de Varianza , Encéfalo/diagnóstico por imagen , Mapeo Encefálico , Femenino , Humanos , Procesamiento de Imagen Asistido por Computador , Imagen por Resonancia Magnética , Masculino , Vías Nerviosas/diagnóstico por imagen , Factores de Tiempo , Adulto Joven
18.
Appl Environ Microbiol ; 84(12)2018 06 15.
Artículo en Inglés | MEDLINE | ID: mdl-29625990

RESUMEN

The quorum sensing (QS) system controls bacterial group behaviors in response to cell density. In vibrios, LuxR and AphA are two master QS regulators (MQSRs) controlling gene expression in response to high or low cell density. Other regulators involved in the regulation of these two MQSRs and QS pathways remain to be determined. Here, we performed bacterial one-hybrid (B1H)-assay-based screens of transcriptional factors (TFs) to identify TFs that can directly regulate the expression of luxR and aphA from a library of 285 TFs encoded by the fish pathogen Vibrio alginolyticus A total of 7 TFs were identified to bind to the promoters of both luxR and aphA Among these TFs, the novel LysR-type transcriptional regulator (LTTR) VqsA could activate LuxR and repress AphA transcription. Meanwhile, LuxR and AphA exerted feedback inhibition and activation of vqsA expression, respectively, indicating that VqsA coordinates QS and is also regulated by QS. In addition, VqsA inhibited its own expression by directly binding to its own promoter region. The VqsA-binding sites in the promoter regions of luxR and aphA as well as the binding sites of LuxR, AphA, and VqsA in the vqsA gene were uncovered by electrophoretic mobility shift assays (EMSAs) and DNase I footprinting analysis. Finally, VqsA was verified to play essential roles in QS-regulated phenotypes, i.e., type VI secretion system 2 (T6SS2)-dependent interbacterial competition, biofilm formation, exotoxin production, and in vivo virulence of V. alginolyticus Collectively, our data showed that VqsA is an important QS regulator in V. alginolyticusIMPORTANCE Investigation of the mechanism of regulation of quorum sensing (QS) systems will facilitate an understanding of bacterial pathogenesis and the identification of effective QS interference (QSI) targets. Here, we systematically screened transcriptional factors (TFs) that modulate the expression of the master QS regulators (MQSRs) LuxR and AphA, and a novel LysR-type transcriptional regulator, VqsA, was identified. Our data illuminated the mechanisms mediating the interaction among LuxR, AphA, and VqsA as well as the effects of these regulators on the expression and output of QS. The impaired expression of virulence genes as a result of vqsA disruption demonstrated that VqsA is an important player in QS regulation and pathogenesis and may be the third MQSR involved in sensing environmental signals by vibrios to coordinate QS responses. This study will facilitate the development of strategies to interfere with QS and effectively control this pathogen that plagues the aquaculture industry.


Asunto(s)
Proteínas Bacterianas/genética , Regulación Bacteriana de la Expresión Génica , Percepción de Quorum/genética , Factores de Transcripción/genética , Vibrio alginolyticus/genética , Vibrio alginolyticus/patogenicidad , Sitios de Unión , Regiones Promotoras Genéticas , Proteínas Represoras/genética , Transactivadores/genética , Virulencia
19.
Molecules ; 23(9)2018 Sep 02.
Artículo en Inglés | MEDLINE | ID: mdl-30200533

RESUMEN

A highly efficient and convenient protocol of imidazolium chloride (30 mol %) catalyzed amidation of amines with moderate to excellent yields was reported. The protocol shows broad substrate scope for aromatic, aliphatic, and heterocyclic primary amines.


Asunto(s)
Amidas/química , Aminas/química , Imidazoles/química , Benzamidas/química , Catálisis , Preparaciones Farmacéuticas/química
20.
Neural Plast ; 2016: 3462309, 2016.
Artículo en Inglés | MEDLINE | ID: mdl-27057360

RESUMEN

Previous studies have demonstrated that amnestic mild cognitive impairment (aMCI) has disrupted properties of large-scale cortical networks based on cortical thickness and gray matter volume. However, it is largely unknown whether the topological properties of cortical networks based on geometric measures (i.e., sulcal depth, curvature, and metric distortion) change in aMCI patients compared with normal controls because these geometric features of cerebral cortex may be related to its intrinsic connectivity. Here, we compare properties in cortical networks constructed by six different morphological features in 36 aMCI participants and 36 normal controls. Six cortical features (3 volumetric and 3 geometric features) were extracted for each participant, and brain abnormities in aMCI were identified by cortical network based on graph theory method. All the cortical networks showed small-world properties. Regions showing significant differences mainly located in the medial temporal lobe and supramarginal and right inferior parietal lobe. In addition, we also found that the cortical networks constructed by cortical thickness and sulcal depth showed significant differences between the two groups. Our results indicated that geometric measure (i.e., sulcal depth) can be used to construct network to discriminate individuals with aMCI from controls besides volumetric measures.


Asunto(s)
Amnesia/diagnóstico por imagen , Corteza Cerebral/diagnóstico por imagen , Disfunción Cognitiva/diagnóstico por imagen , Red Nerviosa/diagnóstico por imagen , Anciano , Anciano de 80 o más Años , Amnesia/patología , Amnesia/fisiopatología , Mapeo Encefálico , Corteza Cerebral/patología , Corteza Cerebral/fisiopatología , Disfunción Cognitiva/patología , Disfunción Cognitiva/fisiopatología , Femenino , Humanos , Imagen por Resonancia Magnética , Masculino , Persona de Mediana Edad , Red Nerviosa/patología , Red Nerviosa/fisiopatología
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