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1.
J Cardiovasc Pharmacol ; 81(3): 232-239, 2023 03 01.
Artigo em Inglês | MEDLINE | ID: mdl-36198097

RESUMO

ABSTRACT: Persistent pulmonary hypertension of the newborn (PPHN) is characterized by pulmonary arterial remodeling mainly because of apoptosis resistance and excessive proliferation of pulmonary artery smooth muscle cells (PASMCs). Sildenafil is a phosphodiesterase-5 inhibitor. Some reports have shown that sildenafil exerts protective effects against PPHN. However, the function of sildenafil in PPHN and the underlying molecular mechanisms is not clear. Here, we revealed that sildenafil effectively suppressed hypoxia-induced PASMC proliferation and apoptosis inhibition ( P < 0.05). Also, sildenafil obviously reduced ventricular hypertrophy, and inhibited pulmonary vascular remodeling in the PPHN model ( P < 0.05). Moreover, sildenafil treatment significantly attenuated the induction of Notch3 and Hes1 induced by hypoxia treatment ( P < 0.05). Furthermore, overexpression of Notch3 abolished the reduction of PASMC proliferation and promotion of PASMC apoptosis induced by sildenafil under hypoxia ( P < 0.05), whereas knockdown of Notch3 had an opposite effect ( P < 0.05). Together, our study demonstrates that sildenafil shows a potential benefit against the development of PPHN by inhibiting Notch3 signaling, providing a strategy for treating PPHN in the future.


Assuntos
Hipertensão Pulmonar , Animais , Ratos , Citrato de Sildenafila/farmacologia , Hipertensão Pulmonar/tratamento farmacológico , Remodelação Vascular , Artéria Pulmonar , Hipóxia/tratamento farmacológico
2.
Phys Chem Chem Phys ; 25(27): 18400-18405, 2023 Jul 12.
Artigo em Inglês | MEDLINE | ID: mdl-37401410

RESUMO

Two-dimensional (2D) ferroelectric materials have important application potential in device miniaturization due to their characteristics of only being a few atomic layers thick and non-volatility. How to design high-performance ferroelectric memory devices based on 2D ferroelectric materials has attracted extensive attention. In this work, based on the 2D organic ferroelectric material semi-hydroxylized graphane (SHLGA), which has in-plane ferroelectric polarization along three different directions, we construct a 2D organic ferroelectric tunnel junction (FTJ). By means of density functional theory (DFT) and the non-equilibrium Green's function (NEGF) method, we calculate the transport properties of the FTJ under different polarizations and obtain a giant tunnel electroresistance (TER) ratio of 7.55 × 104%. We find that the mechanism behind the TER effect in the organic SHLGA is based on the unique built-in electric field. That is, among the three ferroelectric polarization directions, any two directions have an angle of 120°. As a result, the built-in electric fields along the transport direction of the FTJ under different ferroelectric polarization directions are different. Moreover, our study shows that the giant TER effect can also be achieved by utilizing the asymmetry of the polarization along the transport direction of the ferroelectric material itself, which provides another route for the design of 2D FTJs.

3.
Phys Chem Chem Phys ; 25(42): 29241-29248, 2023 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-37874031

RESUMO

Ultrawide-bandgap semiconductors, possessing bandgaps distinctly larger than the 3.4 eV of GaN, have emerged as a promising class capable of achieving deep ultraviolet (UV) light detection. Based on first-principles calculations, we propose an unexplored two-dimensional (2D) InTeClO3 layered system with ultrawide bandgaps ranging from 4.34 eV of bulk to 4.54 eV of monolayer. Our calculations demonstrate that 2D InTeClO3 monolayer can be exfoliated from its bulk counterpart and maintain good thermal and dynamic stability at room temperature. The ultrawide bandgaps may be modulated by the small in-plane strains and layer thickness in a certain range. Furthermore, the 2D InTeClO3 monolayer shows promising electron transport behavior and strong optical absorption capacity in the deep UV range. A two-probe InTeClO3-based photodetection device has been constructed for evaluating the photocurrent. Remarkably, the effective photocurrent (5.7 A m-2 at photon energy of 4.2 eV) generation under polarized light has been observed in such a photodetector. Our results indicate that 2D InTeClO3 systems have strong photoresponse capacity in the deep UV region, accompanying the remarkable polarization sensitivity and high extinction ratio. These distinctive characteristics highlight the promising application prospects of InTeClO3 materials in the field of deep UV optoelectronics.

4.
J Chem Phys ; 159(13)2023 Oct 07.
Artigo em Inglês | MEDLINE | ID: mdl-37787137

RESUMO

Two-dimensional (2D) ferroelectric tunnel junctions (FTJs) have great potential in the design of non-volatile memory devices due to the tunneling electroresistance (TER) effect and the fact that it is not constrained by critical thickness. Incorporation of 2D ferroelectric materials in realistic FTJs inevitably involves the contacts to the traditional three-dimensional (3D) metals. However, how to design the FTJs by combining the 2D ferroelectric materials with the 3D metals still needs to be studied. In this work, we design a vertical 3D FTJ by adopting the 3D metal Au as the left and right electrodes and the 2D ferroelectric material In2Se3 together with h-BN as the central scattering region. By density functional theory combined with the non-equilibrium Green's function (NEGF) method, we demonstrate that the h-BN intercalation with a large bandgap plays the role of good "insulator," which breaks the symmetry of the left and right electrodes. As a result, we obtain the TER ratio of about 170%, and it can be further improved to about 1200% if two layers of In2Se3 (2L-In2Se3) are adopted as the tunneling barrier layer. Our results provide another way for the design and application of ferroelectric memory devices based on 2D ferroelectric materials.

5.
Health Res Policy Syst ; 21(1): 128, 2023 Dec 04.
Artigo em Inglês | MEDLINE | ID: mdl-38049859

RESUMO

BACKGROUND: The Chinese central government launched the third phase of health system reforms in 2009. After a decade since the initiation of the reform, the health system has witnessed noteworthy gains. However, there is no concurrent improvement in public satisfaction with the health system. This study analysed various factors that influence public satisfaction with the system and examined whether perceived quality of care affects public satisfaction. METHODS: A longitudinal nationally representative survey was used for this study. We used five waves of China Family Panel Studies (CFPS) survey data. The final sample consisted of 145 843 observations. A two-way fixed-effects ordered logistic model was used for the analysis. RESULTS: The results indicate that perceived good quality of care was positively associated with public satisfaction in health system regardless of rural-urban residence. Older adults and individuals with more than 3 years of college education were less likely to be satisfied with the system in rural areas. Personal income and the density of medical professionals in the geographic area tend to improve public satisfaction in rural areas. Having medical insurance coverage and fair or good self-rated health improved the probability of reporting public satisfaction in urban areas. Married people and individuals who lived in the West region were less likely to be satisfied with the health system in urban areas. CONCLUSIONS: Knowledge and skills of healthcare providers or physical quality of facilities are not sufficient in improving public satisfaction in the health system. Policymakers need to identify options to influence the important factors that affect public perception of the system. This analysis identified several policy-amenable factors to improve public perception of the health system in rural and urban China.


Assuntos
Programas Governamentais , Reforma dos Serviços de Saúde , Humanos , Idoso , Inquéritos e Questionários , Satisfação Pessoal , China , População Rural
6.
Zhonghua Yi Xue Yi Chuan Xue Za Zhi ; 40(8): 1015-1020, 2023 Aug 10.
Artigo em Zh | MEDLINE | ID: mdl-37532504

RESUMO

OBJECTIVE: To explore the clinical and genetic characteristics of a very early-onset inflammatory bowel disease (VEO-IBD) type 28 child with atypical clinical manifestations. METHODS: A VEO-IBD type 28 child with atypical clinical manifestations admitted to the Department of Neonatology, Children's Hospital Affiliated to Shandong University on November 5, 2021 was selected as the study subject. Clinical data of the child was collected. Peripheral venous blood samples of the child and his parents were collected for high-throughput sequencing. Candidate variants were verified by Sanger sequencing and bioinformatic analysis. RESULTS: The child, a 50-day-old male, had manifested bronchitis, ulcerative stomatitis, eczema and slightly loose stool. High-throughput sequencing revealed that he has harbored compound heterozygous variants of the IL-10RA gene, namely c.299T>G (p.V100G) and c.301C>T (p.R101W), which were inherited from his father and mother, respectively. Bioinformatic analysis showed that both variants have been recorded in the HGMD database, though the c.299T>G variant has not been included in the gnomAD, 1000 Genomes, ExAC and ESP6500 databases, while the c.301C>T variant has a low population frequency. Both variants were predicted to be deleterious by the online software including SIFT, PolyPhen-2 and Mutation Taster. Based on the guidelines from the American College of Medical Genetics and Genomics (ACMG), both variants were predicted to be pathogenic (PS3+PM2_Supporting+PP3). CONCLUSION: The c.299T>G and c.301C>T variants of the IL-10RA gene probably underlay the VEO-IBD type 28 in this child. Above finding has expanded the phenotypic spectrum of VEO-IBD type 28 due to variants of the IL-10RA gene and provided a reference for the clinical diagnosis of this disease.


Assuntos
Biologia Computacional , Doenças Inflamatórias Intestinais , Humanos , Criança , Masculino , Diarreia , Frequência do Gene , Doenças Inflamatórias Intestinais/genética , Mutação
7.
BMC Pediatr ; 22(1): 617, 2022 10 26.
Artigo em Inglês | MEDLINE | ID: mdl-36289463

RESUMO

BACKGROUND: Necrotizing enterocolitis (NEC) is a disastrous gastrointestinal disease of newborns, and the mortality rate of infants with NEC is approximately 20%-30%. The exploration of pathogenic targets of NEC will be conducive to timely diagnosis of NEC. METHODS: The whole transcriptome RNA sequencing was performed on NEC samples to reveal the expression of lncRNAs, circRNAs, miRNAs and mRNAs. Using differential expression analysis, cross analysis, target prediction, enrichment analysis, the pathogenic ceRNA network and target was found. RESULTS: Preliminarily, 281 DEmRNAs, 21 DEmiRNAs, 253 DElncRNAs and 207 DEcircRNAs were identified in NEC samples compared with controls. After target prediction and cross analyses, a key ceRNA regulatory network was built including 2 lncRNAs, 4 circRNAs, 2 miRNAs and 20 mRNAs. These 20 mRNAs were significantly enriched in many carbohydrate metabolism related pathways. After cross analysis of hypoxia-, carbohydrate metabolism-related genes, and 20 core genes, one gene HK2 was finally obtained. Dendritic cells activated were significantly differentially infiltrated and negatively correlated with HK2 expression in NEC samples. CONCLUSIONS: The promising pathogenic hypoxia-related gene HK2 has been firstly identified in NEC, which might also involve in the carbohydrate metabolism in NEC.


Assuntos
Enterocolite Necrosante , MicroRNAs , RNA Longo não Codificante , Humanos , Lactente , Recém-Nascido , Enterocolite Necrosante/genética , Enterocolite Necrosante/patologia , Hipóxia/genética , RNA Circular , RNA Longo não Codificante/genética , RNA Mensageiro/genética
8.
Phys Chem Chem Phys ; 23(30): 16349-16356, 2021 Aug 04.
Artigo em Inglês | MEDLINE | ID: mdl-34318829

RESUMO

Tunneling electroresistance (TER) is the change in tunneling resistance induced by ferroelectric polarization reversal in ferroelectric tunnel junctions (FTJs), and how to achieve a giant TER has always been a central topic in the study of FTJs. In this work, by considering the NaTiO3/BaTiO3/LaTiO3 junction with asymmetric polar interfaces as an example, we propose a novel scheme to realize a giant TER based on the reversible partial metallization of ferroelectric barrier upon the switching of ferroelectric polarization. Density functional theory calculations indicate that high on-state and low off-state conductances are obtained and the TER ratio is as high as 3.20 × 108% due to the reversible partial barrier metallization, which leads to a great difference in the effective tunneling barrier widths. The reversible partial barrier metallization, accompanied by the ferroelectric polarization reversal, is driven by the parallel or anti-parallel alignment of the depolarization electrical field of the ferroelectrical barrier and a strong built-in electrical field cooperatively contributed by the asymmetric polar interfaces and the difference in the work functions of the two leads. The findings suggest a feasible scheme for constructing promising high performance FTJ memory devices by combining both asymmetric polar interfaces and substantially different work functions.

9.
Hereditas ; 158(1): 45, 2021 Nov 12.
Artigo em Inglês | MEDLINE | ID: mdl-34772470

RESUMO

BACKGROUND: Septic shock is the most severe complication of sepsis, and is a major cause of childhood mortality, constituting a heavy public health burden. METHODS: We analyzed the gene expression profiles of septic shock and control samples from the Gene Expression Omnibus (GEO). Four differentially expressed genes (DEGs) from survivor and control groups, non-survivor and control groups, and survivor and non-survivor groups were selected. We used data about these genes to establish a logistic regression model for predicting the survival of septic shock patients. RESULTS: Leave-one-out cross validation and receiver operating characteristic (ROC) analysis indicated that this model had good accuracy. Differential expression and Gene Set Enrichment Analysis (GSEA) between septic shock patients stratified by prediction score indicated that the systemic lupus erythematosus pathway was activated, while the limonene and pinene degradation pathways were inactivated in the high score group. CONCLUSIONS: Our study provides a novel approach for the prediction of the severity of pathology in septic shock patients, which are significant for personalized treatment as well as prognostic assessment.


Assuntos
Sepse , Choque Séptico , Criança , Humanos , Modelos Logísticos , Prognóstico , Curva ROC , Choque Séptico/genética
10.
Cogn Emot ; 34(8): 1676-1689, 2020 12.
Artigo em Inglês | MEDLINE | ID: mdl-32698691

RESUMO

The effect of emotion on memory often leads to the trade-off: enhanced memory for emotional items comes at the cost of memory for background information. Although this effect is usually attributed to overt attention during encoding, Steinmetz and Kensinger (2013) proposed that such an effect might also be related to post-stimulus elaboration. Based on previous different viewpoints, we used the directed forgetting paradigm to further explore the effect of post-stimulus elaboration on the memory trade-off. In the meantime, we also tested the roles of background valence and item salience (high salient items were placed in the centre of backgrounds while low salient items were placed in the periphery of backgrounds) in modulating the memory trade-off. Our results showed that there was a memory trade-off when backgrounds were neutral, whereas this was no longer the case when backgrounds were negative. This indicated the memory trade-off might be affected by background valence. Meanwhile, we found post-stimulus elaboration contributed to selective memory enhancement for backgrounds, while item salience enhanced item memory performance in the memory trade-off. These findings suggest the emotion-induced memory trade-off may be a complex memory effect, which can be influenced by different factors to varying degrees.


Assuntos
Atenção/fisiologia , Emoções/fisiologia , Memória/fisiologia , Adolescente , Adulto , China , Cognição , Feminino , Humanos , Masculino , Estudantes/psicologia , Estudantes/estatística & dados numéricos , Adulto Jovem
11.
J Cell Biochem ; 120(3): 3664-3671, 2019 03.
Artigo em Inglês | MEDLINE | ID: mdl-30216518

RESUMO

OBJECTIVE: Sepsis represents a complex disease with the dysregulated inflammatory response. The purpose of this study is to explore the role of interleukin 17 (IL-17, also known as IL-17A) in the occurrence and development of pediatric sepsis. METHODS: We established the sepsis neonatal rat model with the method of intraperitoneal injection of Escherichia coli (E coli). At each target time point, we got the blood from heart after anesthetizing animals, and the lung and liver tissues were fixed in formalin. Immunohistochemistry and enzyme-linked immunosorbent assay assay was used to analyze the expression of IL-17A in the lung/liver and plasma respectively. A public data set of neonatal sepsis gene microarray was used to verify our result, and explore main functions of IL-17A in sepsis. RESULTS: The expression levels of IL-17A in the plasma, lung and liver gradually increased with the extension of the experimental time in sepsis group, and were significantly higher than control group at 4 hours after injection of E coli (P < 0.01). In our study, we found the levels of IL-17A mRNA in pediatric sepsis group were significantly higher than control group, which is consistent with the neonatal rat septicemia model. In addition, through the functional (GO) enrichment analysis, we found the genes associated with IL-17A in pediatric sepsis are mainly enriched in the functions of immune response and cell membrane formation. CONCLUSION: IL-17A might be a potential therapeutic target for pediatric sepsis.


Assuntos
Interleucina-17/sangue , Fígado/metabolismo , Pulmão/metabolismo , Sepse/metabolismo , Animais , Animais Recém-Nascidos , Modelos Animais de Doenças , Fígado/patologia , Pulmão/patologia , Ratos , Ratos Sprague-Dawley , Sepse/patologia
12.
Thromb J ; 17: 19, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31592240

RESUMO

BACKGROUND: Our objective was to study the phenotype of and molecular genetic mechanisms underlying congenital protein C (PC) deficiency in Chinese neonates. We report the case of a neonate who presented 4 h after birth with purpura fulminans of the skin and thrombosis in the kidney. We also carried out a through literature review to study the genotype and phenotype, relevance, diagnosis, management, and prognosis of neonates with congenital PC deficiency in China. CASE PRESENTATION AND LITERATURE REVIEW: Following a septic work-up and check of PC and protein S (PS) levels that showed PC deficiency, we investigated the patient's and her parents' genotypes. Our patient was found to have a plasma PC level of 0.8%. Molecular testing revealed a compound heterozygous mutation of the PROC gene: From the father, a c._262 G > T p. ASP88Tyr mutation in exon 4; from the mother, a C. 400 + 5G mutation in intron 5 that had been previously reported as likely pathogenic. Both parents were found to have heterozygous mutations for PC deficiency. In China, 5 other cases of congenital PC deficiency in the neonatal period were reported in the literature. In those cases, purpura fulminans and thrombosis were the main symptoms, and homozygous or compound heterozygous mutations of the PROC gene were identified. CONCLUSION: Congenital PC deficiency should be ruled out for neonates presenting with purpura fulminans and thrombosis.

13.
Horm Metab Res ; 50(5): 414-421, 2018 May.
Artigo em Inglês | MEDLINE | ID: mdl-29523003

RESUMO

Aquaporin-9 (AQP9) is an aquaglyceroporin that biophysically conducts water, glycerol, and other small solutes. AQP9 is expressed in hepatocytes on the sinusoidal surfaces of hepatocyte plates in the liver, where it is considered responsible for the glycerol uptake in gluconeogenesis. However, limited information is available on the expression and regulating mechanism of AQP9 in different hyperglycemia models. Thus, this study examined the expression patterns of AQP9 and mitogen-activated protein kinase (MAPK) in Types 1 and 2 diabetes mellitus (DM) to clarify the roles and regulating mechanism of AQP9 in gluconeogenesis. Compared with the control group, the AQP9 expression significantly increased in both Types 1 and 2 DM, and the increased expression was associated with the activation of phosphorylated JNK (p-JNK) and the inhibition of phosphorylated p38 (p-p38). By contrast, phosphorylated ERK remained stable in the liver with Type 1 or 2 DM. These effects could be reversed by insulin treatment. That is, insulin downregulated AQP9 by inhibiting p-JNK and activating p-p38. The upregulation of AQP9 could be involved in gluconeogenesis and co-regulated by the JNK and p38 MAPK pathway in both Types 1 and 2 DM.


Assuntos
Aquaporinas/biossíntese , Diabetes Mellitus Experimental/metabolismo , Diabetes Mellitus Tipo 1/metabolismo , Diabetes Mellitus Tipo 2/metabolismo , Regulação da Expressão Gênica , MAP Quinase Quinase 4/biossíntese , Proteínas Quinases p38 Ativadas por Mitógeno/biossíntese , Animais , Perfilação da Expressão Gênica , Masculino , Ratos , Ratos Sprague-Dawley
14.
Zhonghua Yi Xue Yi Chuan Xue Za Zhi ; 35(3): 422-425, 2018 Jun 10.
Artigo em Zh | MEDLINE | ID: mdl-29896746

RESUMO

OBJECTIVE: To explore the genetic basis for a neonate with bloody stool and thrombocytopenia. METHODS: Clinical data of the neonate was collected. Peripheral venous blood samples were extracted from the neonate and his parents. Next generation sequencing through target capturing was carried out to detect potential mutations of genes associated with thrombocytopenia. Suspected mutation was validated by Sanger sequencing. RESULTS: The 14-day-old male neonate was admitted to hospital for bloody stool for 8 days, decreased platelet count and reduced platelet volume. His liver function and blood coagulation were both normal. Genetic testing revealed a novel deletional mutation in c.1221delG (G407fsX444) of the WAS gene in the patient, which was inherited from his mother. CONCLUSION: The c.1221delG (G407fsX444) mutation of the WAS gene probably underlies the X-linked thrombocytopenia in the proband. Next generation sequencing can facilitate the diagnose and genetic counseling of such diseases.


Assuntos
Doenças Genéticas Ligadas ao Cromossomo X/genética , Trombocitopenia/genética , Sequência de Bases , Sequenciamento de Nucleotídeos em Larga Escala , Humanos , Recém-Nascido , Masculino , Dados de Sequência Molecular , Mutação , Proteína da Síndrome de Wiskott-Aldrich/genética
15.
J Cell Biochem ; 118(12): 4905-4913, 2017 12.
Artigo em Inglês | MEDLINE | ID: mdl-28569417

RESUMO

Glioma is the most common and lethal central nervous system tumors. Temozolomide (TMZ) is an effective drug for malignant glioma, however, the intracellular and molecular mechanisms behind this anti-cancer effect have yet to be fully understood. The aim of the present study was to determine whether TMZ inhibits proliferation, invasion of glioma cells in vitro and whether these effects can be mediated through modulation of aquaporin 4 (AQP4) and phosphorylation of the MAPK pathway. The viability of U87 and U251 human glioma cells was evaluated using MTT assay. The cell cycle distribution was detected with flow cytometry. Migration ability and invasion ability were tested by scratch assays and transwell assays, respectively. The levels of AQP4 and MAPK were measured using immunoblot analyses. Our results showed that TMZ inhibited proliferation, migration and invasion, and induced G2/M arrest in U87 and U251 glioma cell lines. These changes were associated with a decrease in the levels of AQP4 expression as well as activation phosphorylated level of p38. Treatment with a p38 chemical activator (anisomycin) resulted in similar effects as TMZ treatment on glioma cells. And p38 chemical inhibitor (SB203580) could block these effects in glioma treated with TMZ, suggesting a direct up-regulation of the p38 signaling pathway. Therefore, we identified that TMZ might have therapeutic potential for controlling proliferation, invasion of malignant glioma by inhibiting AQP4 expression through activation of p38 signal transduction pathway. J. Cell. Biochem. 118: 4905-4913, 2017. © 2017 Wiley Periodicals, Inc.


Assuntos
Aquaporina 4/biossíntese , Dacarbazina/análogos & derivados , Regulação para Baixo/efeitos dos fármacos , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Glioma/metabolismo , Sistema de Sinalização das MAP Quinases/efeitos dos fármacos , Proteínas de Neoplasias/metabolismo , Proteínas Quinases p38 Ativadas por Mitógeno/metabolismo , Aquaporina 4/genética , Linhagem Celular Tumoral , Dacarbazina/farmacologia , Glioma/patologia , Humanos , Sistema de Sinalização das MAP Quinases/genética , Invasividade Neoplásica , Proteínas de Neoplasias/genética , Temozolomida , Proteínas Quinases p38 Ativadas por Mitógeno/genética
16.
J Cell Mol Med ; 20(2): 294-301, 2016 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-26576513

RESUMO

Membrane sialic acid (SA) plays an important role in the survival of red blood cells (RBCs), the age-related reduction in SA content negatively impacts both the structure and function of these cells. We have therefore suggested that remodelling the SA in the membrane of aged cells would help recover cellular functions characteristic of young RBCs. We developed an effective method for the re-sialylation of aged RBCs by which the cells were incubated with SA in the presence of cytidine triphosphate (CTP) and α-2,3-sialytransferase. We found that RBCs could be re-sialylated if they had available SA-binding groups and after the re-sialylation, aged RBCs could restore their membrane SA to the level in young RBCs. Once the membrane SA was restored, the aged RBCs showed recovery of their biophysical and biochemical properties to similar levels as in young RBCs. Their life span in circulation was also extended to twofold. Our findings indicate that remodelling membrane SA not only helps restore the youth of aged RBCs, but also helps recover injured RBCs.


Assuntos
Envelhecimento Eritrocítico/fisiologia , Membrana Eritrocítica/metabolismo , Membrana Eritrocítica/fisiologia , Eritrócitos/metabolismo , Eritrócitos/fisiologia , Ácido N-Acetilneuramínico/metabolismo , Adulto , Animais , Contagem de Eritrócitos/métodos , Humanos , Masculino , Coelhos , Adulto Jovem
17.
Magn Reson Med ; 74(4): 1057-69, 2015 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-25311235

RESUMO

PURPOSE: To develop and evaluate a novel method of generalized auto-calibrating partially parallel acquisition (GRAPPA) with spatially varying calibration of self-constraint for parallel magnetic resonance imaging (MRI) reconstruction. THEORY AND METHODS: The conventional GRAPPA independently estimates each missing sample with adjacent acquired data over multiple coils, thereby ignoring correlations inside missing data. Self-constrained methods can exploit correlations inside missing data by imposing linear dependence within full neighborhood kernels and showing improved reconstruction compared with GRAPPA. However, self-constraint kernels are currently calibrated by using auto-calibration signals. Thus, they may be suboptimal for reconstructing outer k-space because of spatially varying correlations. This study proposes a novel GRAPPA method with separate self-constraints (SSC-GRAPPA). In this method, the spatially varying self-constraint coefficients are adaptively calibrated by separately exploiting correlations inside missing and acquired data in the outer k-space. Both phantom and in vivo imaging experiments were conducted with retrospective undersampling to evaluate the performance of the proposed method. RESULTS: Compared with GRAPPA and self-constrained GRAPPA, the proposed SSC-GRAPPA generates images with reduced artifacts and noise. CONCLUSION: The proposed method provides an effective and efficient approach to improve parallel MRI reconstruction, and has potential to benefit routine clinical practice in the future.


Assuntos
Processamento de Imagem Assistida por Computador/métodos , Imageamento por Ressonância Magnética/métodos , Algoritmos , Encéfalo/anatomia & histologia , Calibragem , Humanos , Neuroimagem , Imagens de Fantasmas
18.
J Pathol ; 231(3): 323-34, 2013 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-23878072

RESUMO

We sought to investigate the clinicopathological significance and biological function of hepatoma-derived growth factor (HDGF) in Ewing's sarcoma. Our results showed that HDGF expression is up-regulated in Ewing's sarcoma. Nuclear HDGF expression is significantly associated with tumour volume (p < 0.001), metastases at diagnosis (p < 0.001), low overall survival rate (p < 0.001) and low disease-free survival rate (p < 0.001). HDGF knock-down results in significant reduction of Ewing's sarcoma cell growth, proliferation and enhances tumourigenesis, both in vitro and in vivo. Meanwhile, HDGF knock-down causes cell cycle arrest and enhanced sensitization to serum starvation-induced apoptosis. Furthermore, recombinant HDGF promotes proliferation and colony formation of Ewing's sarcoma cells. Ninety-eight candidate HDGF downstream genes were identified in Ewing's sarcoma cells using cDNA microarray analysis. In addition, we found that HDGF knock-down inhibited FLI1 expression in Ewing's sarcoma cells at the mRNA and protein levels. Our findings suggest that HDGF exhibits oncogenic properties and may be a novel prognostic factor in Ewing's sarcoma. Targeting HDGF might be a potential therapeutic strategy for Ewing's sarcoma.


Assuntos
Biomarcadores Tumorais/metabolismo , Neoplasias Ósseas/metabolismo , Peptídeos e Proteínas de Sinalização Intercelular/metabolismo , Sarcoma de Ewing/metabolismo , Animais , Apoptose , Biomarcadores Tumorais/genética , Neoplasias Ósseas/genética , Neoplasias Ósseas/mortalidade , Neoplasias Ósseas/patologia , Pontos de Checagem do Ciclo Celular , Linhagem Celular Tumoral , Proliferação de Células , Distribuição de Qui-Quadrado , Intervalo Livre de Doença , Feminino , Regulação Neoplásica da Expressão Gênica , Humanos , Peptídeos e Proteínas de Sinalização Intercelular/genética , Estimativa de Kaplan-Meier , Camundongos , Camundongos Endogâmicos BALB C , Camundongos Nus , Análise Multivariada , Modelos de Riscos Proporcionais , Interferência de RNA , Sarcoma de Ewing/genética , Sarcoma de Ewing/mortalidade , Sarcoma de Ewing/secundário , Fatores de Tempo , Transfecção , Carga Tumoral , Regulação para Cima
19.
Psychol Res Behav Manag ; 17: 201-216, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38264346

RESUMO

Objective: This study was conducted to identify the factors (especially parental involvement, academic self-efficacy, and depression) associated with academic performance among Chinese K-12 students during the COVID-19 pandemic. Methods: This cross-sectional study used data from the 2020 China Family Panel Studies (CFPS). The CFPS was conducted from July to December 2020 during the COVID-19 pandemic. A multistage probability sample proportional to size was used for the survey. The final sample consisted of 1747 K-12 students. This study used the 14-item Chinese Parental Involvement and Support Scale, the Responsibility Scale, and the 8-item Center for Epidemiologic Studies Depression Scale to measure parental involvement, academic self-efficacy, and depression, respectively. An ordered probit regression and structural equation models were employed to analyze the factors associated with academic performance. A multiple imputation technique was applied to compute missing values in selected variables. Results: We found that parental involvement and academic self-efficacy were positively associated with good academic performance. In contrast, depression was negatively associated with good academic performance. Moreover, academic stress, male, rural residency, middle school, family size, high income, online gaming daily, reading, and intelligence quotient were statistically significant predictors on academic performance. Conclusion: The empirical findings suggested that parental involvement and academic self-efficacy were positively and significantly associated with good academic performance. However, depression was negatively and significantly associated with good academic performance. These results showed that policymakers and practitioners can help improve academic success and address educational inequalities among K-12 students by implementing a series of reforms.

20.
Heliyon ; 9(12): e22157, 2023 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-38076088

RESUMO

Within the context of mounting competition faced by Hollywood movies in the global cinema market, particularly in emerging markets, this paper examines the influence of review disagreements and cultural capital on the cultural discount of imported Hollywood blockbusters in China's movie market. Using a dataset of 652 movies from the U.S. spanning 1994-2019, we find that review disagreements between U.S. and Chinese consumers exacerbate the cultural discount on imported Hollywood movies in China. However, cultural capital, measured by the accumulated revenue of specific imported movie genres in China, effectively mitigates this discount. We also observe a reduction in the discount for movie genres with fewer language barriers. Accounting for endogeneity due to reverse causality and selection bias, we identify a significant structural break in 2012. In the post-2012 era, collaboration involving China's censorship, quota rules, and film-production laws has improved the market mechanism and cultural capital accumulation, enhancing the performance of imported Hollywood movies in China. Minority movies, characterized by being less mainstream and commercial, are more sensitive to review disagreements, while cultural capital plays a greater role in mitigating the discount for mainstream Hollywood movies. These findings have significant implications for professionals involved in the distribution and screening of Hollywood movies in China.

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