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1.
J Spinal Cord Med ; 40(3): 338-345, 2017 05.
Artigo em Inglês | MEDLINE | ID: mdl-27814138

RESUMO

BACKGROUND: Diffusion tensor imaging (DTI) shows great advantage in the diagnosis of brain diseases, including cervical spinal cord (CSC) disease. This study aims to obtain the normal values of the DTI parameters for a healthy population and to establish a baseline for CSC disease diagnosis using DTI. METHODS: A total of 36 healthy adults were subjected to magnetic resonance imaging (MRI) for the entire CSC using the Siemens 3.0 T MR System. Sagittal DTI acquisition was carried out with a single-shot spin-echo echo-planar imaging (EPI) sequence along 12 non-collinear directions. Fractional anisotropy (FA) and apparent diffusion coefficient (ADC) values were determined at different cervical levels using a region of interest (ROI) method, following which they were correlated with parameters, like age and sex. Further, diffusion tensor tracking (DTT) was carried out to reconstruct the white matter fiber bundles of the CSC. RESULTS: The full and complete fiber bundle structure of a normal CSC was confirmed in both the T2-weighted and DTI images. The FA and ADC values were significantly negatively correlated with each other and showed strongly negative and positive correlations with age, respectively, but not with sex. Additionally, there was no significant difference between the FA and the ADC values at different cervical levels. CONCLUSION: The DTI technique can act as an important supplement to the conventional MRI technique for CSC observation. Moreover, the FA and ADC values can be used as sensitive parameters in the DTI study on the CSC by taking the effects of age into consideration.


Assuntos
Medula Cervical/diagnóstico por imagem , Imagem de Tensor de Difusão/métodos , Adolescente , Adulto , Fatores Etários , Idoso , Medula Cervical/crescimento & desenvolvimento , Imagem de Tensor de Difusão/normas , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Fatores Sexuais
2.
Turk Neurosurg ; 26(3): 384-288, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27161465

RESUMO

AIM: To investigate the variation and significance of malondialdehyde (MDA) and superoxide dismutase (SOD) in brain tissue after secondary brain injury (SBI) with seawater immersion in rats. MATERIAL AND METHODS: We randomly divided 163 male Sprague Dawley rats into 4 groups, as normal (Group A), SBI (Group B), SBI with physiological saline immersion (Group C) and SBI with seawater immersion (Group D) groups. The animal model of ischemic SBI with seawater immersion was established based on the Marmarou's model of diffuse brain injury. The water content, and the MDA and SOD contents of brain tissue were detected at 1, 3, 6, 12, 24 and 48 hours after the injury. RESULTS: Compared to group A, there were significant changes of various indicators in group D after injury at 1 hour after injury (P < 0.05). The water content and MDA contents in brain tissue were persistently elevated and significantly higher than that in groups B and C at each time phase (P < 0.05). The SOD content showed a persistent decline and was significantly lower than that in groups B and C at each time phase (P < 0.05). The SOD content was negatively correlated with the MDA content with a correlation coefficient of -0.992 (P < 0.01). CONCLUSION: The SBI with seawater immersion is faster and more serious than the simple SBI.


Assuntos
Química Encefálica , Lesões Encefálicas/metabolismo , Lesões Encefálicas/fisiopatologia , Imersão/fisiopatologia , Malondialdeído/metabolismo , Água do Mar , Superóxido Dismutase/metabolismo , Animais , Antioxidantes/metabolismo , Lesões Encefálicas/enzimologia , Masculino , Ratos , Ratos Sprague-Dawley , Água/metabolismo
3.
Mol Med Rep ; 13(6): 4541-8, 2016 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-27081915

RESUMO

The aim of the present study was to investigate the in vitro and in vivo anticancer and apoptotic effects of taraxerol acetate in U87 human glioblastoma cells. The effects on cell cycle phase distribution, cell cycle-associated proteins, autophagy, DNA fragmentation and cell migration were assessed. Cell viability was determined using the MTT assay, and phase contrast and fluorescence microscopy was utilized to determine the viability and apoptotic morphological features of the U87 cells. Flow cytometry using propidium iodide and Annexin V-fluorescein isothiocyanate demonstrated the effect of taraxerol acetate on the cell cycle phase distribution and apoptosis induction. Western blot analysis was performed to investigate the effect of the taraxerol acetate on cell cycle­associated proteins and autophagy­linked LC3B­II proteins. The results demonstrated that taraxerol acetate induced dose­ and time­dependent cytotoxic effects in the U87 cells. Apoptotic induction following taraxerol acetate treatment was observed and the percentage of apoptotic cells increased from 7.3% in the control cells, to 16.1, 44.1 and 76.7% in the 10, 50 and 150 µM taraxerol acetate­treated cells, respectively. Furthermore, taraxerol acetate treatment led to sub­G1 cell cycle arrest with a corresponding decrease in the number of S­phase cells. DNA fragments were observed as a result of the gel electrophoresis experiment following taraxerol acetate treatment. To investigate the inhibitory effects of taraxerol acetate on the migration of U87 cell, a wound healing assay was conducted. The number of cells that migrated to the scratched area decreased significantly following treatment with taraxerol acetate. In addition, taraxerol acetate inhibited tumor growth in a mouse xenograft model. Administration of 0.25 and 0.75 µg/g taraxerol acetate reduced the tumor weight from 1.2 g in the phosphate­buffered saline (PBS)­treated group (control) to 0.81 and 0.42 g, respectively. Similarly, 0.25 and 0.75 µg/g taraxerol acetate injection reduced the tumor volume from 1.3 cm3 in the PBS-treated group (control) to 0.67 and 0.25 cm3, respectively.


Assuntos
Antineoplásicos Fitogênicos/farmacologia , Apoptose/efeitos dos fármacos , Autofagia/efeitos dos fármacos , Pontos de Checagem do Ciclo Celular/efeitos dos fármacos , Movimento Celular/efeitos dos fármacos , Triterpenos/farmacologia , Animais , Proteínas de Ciclo Celular/genética , Proteínas de Ciclo Celular/metabolismo , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Fragmentação do DNA/efeitos dos fármacos , Modelos Animais de Doenças , Feminino , Expressão Gênica , Glioblastoma/tratamento farmacológico , Glioblastoma/genética , Glioblastoma/metabolismo , Glioblastoma/patologia , Humanos , Camundongos , Carga Tumoral/efeitos dos fármacos , Ensaios Antitumorais Modelo de Xenoenxerto
4.
J Chem Neuroanat ; 71: 13-9, 2016 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-26698223

RESUMO

BACKGROUND: The hippocampus, central amygdaloid nucleus and the ventromedial region (marginal division) of the striatum have been reported to be involved in the mechanism of learning and memory. This study aimed elucidating anatomical and functional connections among these brain areas during learning and memory. RESULTS: In the first part of this study, the c-Fos protein was used to explore functional connections among these structures. Chemical stimulation of either hippocampus or central amygdaloid nucleus results in dense expression of c-Fos protein in nuclei of neurons in the marginal division of the striatum, indicating that the hippocampus and the central amygdaloid nucleus might be functionally connected with the marginal division. In the second part of the study, the cholera toxin subunit B-horseradish peroxidase was injected into the central amygdaloid nucleus to observe anatomical connections among them. The retrogradely transported conjugated horseradish peroxidase was observed in neurons of both the marginal division and dorsal part of the hippocampus following the injection. Hence, neural fibers from both the marginal division and the hippocampus directly projected to the central amygdaloid nucleus. CONCLUSION: The results implicated potential new functional and structural pathways through these brain areas during the process of learning and memory. The pathways ran from ventromedial portion (the marginal division) of the striatum to the central amygdaloid nucleus and then to the hippocampus before going back to the marginal division of the striatum. Two smaller circuits were between the marginal division and the central amygdaloid nucleus, and between the central amygdaloid nucleus and the hippocampus. These connections have added new dimensions of neural networks of learning and memory, and might be involved in the pathogenesis of dementia and Alzheimer disease.


Assuntos
Tonsila do Cerebelo/fisiologia , Corpo Estriado/fisiologia , Hipocampo/fisiologia , Aprendizagem , Animais , Núcleo Celular/metabolismo , Toxina da Cólera , Peroxidase do Rábano Silvestre , Masculino , Memória , Vias Neurais , Neurônios/metabolismo , Proteínas Proto-Oncogênicas c-fos/metabolismo , Ratos Sprague-Dawley
5.
Cell Physiol Biochem ; 32(4): 986-96, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-24107402

RESUMO

BACKGROUND: Increasing evidence shows that inflammation plays an important role in the occurrence and progression of acute ischemic stroke. The receptor for advanced glycation end products (RAGE) has been documented to involve in the pathogenic mechanisms of a variety of neurological diseases, including ischemic stroke (IS). However, the impact of RAGE gene polymorphisms on the susceptibility to IS has not been reported. We thus explored the association between RAGE gene polymorphisms and the susceptibility to IS. METHOD: A total of 384 patients with IS and 425 healthy controls were enrolled in this study. Three genetic polymorphisms of RAGE gene (82G/S, -429T/C and -374T/A) were determined. The serum levels of soluble RAGE (sRAGE), intetleukin-6 (IL-6), high sensitivity-C reaction protein (hs-CRP) and plasminogen activator inhibitor-1 (PAI-1) were detected. RESULTS: Among the studied polymorphisms, only the polymorphism at 82G/S of RAGE gene was associated with the risk for ischemic stroke irrespective of the stroke subtypes. The 82S/S homozygote carriers had a significantly increased risk for ischemic stroke [adjusted odds ratio (OR): 2.297; p<0.001]. The haplotype analyses showed that the C-429S82T-374 and T-429S82A-374 had higher risk to develop IS (OR=1.864 and 1.931, respectively, all p<0.01), while the C-429G82T-374 showed a protective effect against IS susceptibility (OR=0.568, p=0.001). In addition, the 82S/S homozygote carriers had a higher inflammatory level compared with 82G/S and 82G/G genotypes, indicated by lower serum sRAGE level, higher serum IL-6, hs-CRP and PAI-1 levels. The polymorphisms at -374 and -429 loci did not influence the stroke risk and the above mentioned inflammation cytokines. CONCLUSION: Our results showed a close correlation between the 82G/S polymorphism and the susceptibility to IS, suggesting the 82G/S polymorphism may be used as a genetic marker for the prediction of stroke occurrence in high risk subjects.


Assuntos
Polimorfismo de Nucleotídeo Único/genética , Receptores Imunológicos/genética , Acidente Vascular Cerebral/genética , Idoso , Grupo com Ancestrais do Continente Asiático , Proteína C-Reativa/metabolismo , Feminino , Frequência do Gene , Genótipo , Homozigoto , Humanos , Interleucina-6/sangue , Masculino , Pessoa de Meia-Idade , Inibidor 1 de Ativador de Plasminogênio/sangue , Receptor para Produtos Finais de Glicação Avançada , Acidente Vascular Cerebral/sangue
6.
Turk Neurosurg ; 23(4): 491-7, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-24101269

RESUMO

AIM: The current study aims to explore the clinical characteristics of craniocerebral firearm injury and to improve the diagnosis and treatment of this condition. MATERIAL AND METHODS: Data from 56 patients with craniocerebral firearm injury were analyzed retrospectively for projectile types, traumatic conditions, and treatment approaches. RESULTS: 43 patients exhibited intracranial foreign body residence. Of them, 40 were subjected to complete foreign body removal and 2 to partial removal, leaving 1 without receiving removal treatment. 54 patients (96.4%) survived and 2 (3.6%) died. Of the survivors, 36 (64.3%) recovered well, 15 (26.8%) were moderately disabled, 2 (3.6%) were severely disabled, and 1 (1.8%) lapsed into vegetative state. Patients receiving debridement within 8 h after injury had a significantly higher recovery rate than those receiving such treatment after 8 h (82.1% vs. 26.7%; P < 0.001). CONCLUSION: Craniocerebral firearm injury is characterized by rapid traumatic condition development as well as serious trauma and contamination. Accurately judging the traumatic condition and the ballistic tract, performing complete debridement as early as possible, reasonably deciding on the operative mode and approach for intracranial residing foreign body removal, and increasing vigilance regarding concomitant injuries are the keys to the improvement of the overall treatment of craniocerebral firearm injury.


Assuntos
Traumatismos Craniocerebrais/cirurgia , Procedimentos Neurocirúrgicos/métodos , Ferimentos por Arma de Fogo/cirurgia , Adolescente , Adulto , Criança , Pré-Escolar , Traumatismos Craniocerebrais/diagnóstico , Traumatismos Craniocerebrais/mortalidade , Desbridamento , Descompressão Cirúrgica , Feminino , Corpos Estranhos/cirurgia , Escala de Coma de Glasgow , Escala de Resultado de Glasgow , Humanos , Imagem por Ressonância Magnética , Masculino , Pessoa de Meia-Idade , Neuronavegação , Procedimentos Neurocirúrgicos/instrumentação , Admissão do Paciente , Tomografia Computadorizada por Raios X , Resultado do Tratamento , Ferimentos por Arma de Fogo/diagnóstico , Ferimentos por Arma de Fogo/mortalidade , Adulto Jovem
7.
Neurosci Lett ; 518(1): 1-4, 2012 Jun 14.
Artigo em Inglês | MEDLINE | ID: mdl-22465244

RESUMO

The aim of this study is to explore the association between the polymorphisms of galectin-3 gene and clinico-pathological characteristics and prognosis of gliomas. We enrolled 190 histologically diagnosed gliomas and 210 healthy controls in this study. Two genetic variants at galectin-3 single nucleotide polymorphism (SNP) sites (galectin-3 +191 A>C and +292 A>C) were determined. We found that the A/A genotype at galectin-3 gene +292 A>C was significantly more prevalent in gliomas patient than in controls (42.1% vs. 29.0%, P=0.021); the A allele frequency was markedly higher in gliomas subjects than in controls (61.8% vs. 45.0%, P=0.008). There was a markedly higher prevalence of AA carriers in high-grade subgroup than in low-grade subgroup (50.5% vs. 31.8%, P=0.012). The Kaplan-Meier analyses showed that the gliomas patients carrying AA genotype of galectin-3 gene +292 A>C had marked shorter overall survival period than those did not (AA vs. AC+CC, 22.2±3.8 months vs. 38.3 months±7.9; P=0.04). The SNPs at +191 A>C of galectin-3 gene did not show positive association with clinico-pathological characteristics and prognosis of gliomas. The results of this study suggest the SNPs at +292 A>C, not SNPs at +191 A>C, of galectin-3 gene were associated with the tumor grade and prognosis of gliomas.


Assuntos
Grupo com Ancestrais do Continente Asiático/genética , Galectina 3/genética , Predisposição Genética para Doença , Glioma/genética , Polimorfismo de Nucleotídeo Único , Adulto , Feminino , Galectina 3/análise , Genótipo , Glioma/diagnóstico , Glioma/mortalidade , Humanos , Masculino , Pessoa de Meia-Idade , Gradação de Tumores , Polimorfismo Genético , Prognóstico
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