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Tumor necrosis factor-alpha-308G/A single nucleotide polymorphism and red-complex periodontopathogens are independently associated with increased levels of tumor necrosis factor-alpha in diseased periodontal tissues

TROMBONE, A. P. F.; CARDOSO, C. R.; REPEKE, C. E.; FERREIRA JR., S. B.; MARTINS JR., W.; CAMPANELLI, A. P.; AVILA-CAMPOS, M. J.; TREVILATTO, P. C.; SILVA, J. S.; GARLET, G. P.
Fonte: WILEY-BLACKWELL PUBLISHING, INC Publicador: WILEY-BLACKWELL PUBLISHING, INC
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
126.22%
Background and Objective: Inflammatory cytokines such as tumor necrosis factor-alpha are involved in the pathogenesis of periodontal diseases. A high between-subject variation in the level of tumor necrosis factor-alpha mRNA has been verified, which may be a result of genetic polymorphisms and/or the presence of periodontopathogens such as Porphyromonas gingivalis, Tannerella forsythia, Treponema denticola (called the red complex) and Aggregatibacter actinomycetemcomitans. In this study, we investigated the effect of the tumor necrosis factor-alpha (TNFA) -308G/A gene polymorphism and of periodontopathogens on the tumor necrosis factor-alpha levels in the periodontal tissues of nonsmoking patients with chronic periodontitis (n = 127) and in control subjects (n = 177). Material and Methods: The TNFA-308G/A single nucleotide polymorphism was investigated using polymerase chain reaction-restriction fragment length polymorphism analysis, whereas the tumor necrosis factor-alpha levels and the periodontopathogen load were determined using real-time polymerase chain reaction. Results: No statistically significant differences were found in the frequency of the TNFA-308 single nucleotide polymorphism in control and chronic periodontitis groups...

Níveis de interleucina-6 e fator de necrose tumoral-alfa no liquor de recém-nascidos a termo com encefalopatia hipóxico-isquêmica; Levels of interleukin-6 and tumor necrosis factor-alpha in the cerebrospinal fluid of full-term newborns with hypoxic-ischemic encephalopathy

Silveira, Rita de Cássia dos Santos; Procianoy, Renato Soibelmann
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Artigo de Revista Científica Formato: application/pdf
Português
Relevância na Pesquisa
126.17%
Objetivo: avaliar os níveis liquóricos de IL-6 e TNF-a em recém-nascidos a termo com encefalopatia hipóxico-isquêmica (EHI), comparando-os com os de recém-nascidos controles. Metodologia: estudo caso-controle realizado no período de julho de 1999 a outubro de 2001, incluindo dois grupos de recémnascidos a termo: controle, com 20 recém-nascidos sem sepse e/ou meningite e com escore de Apgar > 9 no primeiro e quinto minutos de vida; e casos, com 15 recém-nascidos asfixiados, caracterizados pelo escore de Apgar < 4 e < 6 no primeiro e quinto minutos de vida, respectivamente, pH umbilical < 7,20 e/ou lactato arterial umbilical > 3,0 mmol/l e necessidade de ventilação com pressão positiva pelo menos durante 2 minutos após o nascimento. Foram coletadas amostras de liquor nas primeiras 48 horas de vida, para determinação dos níveis de IL-6 e TNF-a pelo método de enzimoimunoensaio. Resultados: os grupos não diferiram quanto ao peso de nascimento, idade gestacional, classificação quanto ao peso e idade gestacional, tipo de parto e tempo médio de obtenção do liquor; seus exames foram obtidos em média com 17 horas de vida. Nos recémnascidos asfixiados, as medianas dos níveis liquóricos foram: 157,5 pg/ml para IL-6 e 14...

Influence of Yersinia pseudotuberculosis outer proteins (Yops) on interleukin-12, tumor necrosis factor alpha and nitric oxide production by peritoneal macrophages

Monnazzi, LGS; Carlos, I. Z.; de Medeiros, BMM
Fonte: Elsevier B.V. Publicador: Elsevier B.V.
Tipo: Artigo de Revista Científica Formato: 91-98
Português
Relevância na Pesquisa
126.01%
An essential key to pathogenicity in Yersinia is the presence of a 70 kb plasmid (pYV) which encodes a type-III secretion system and several virulence outer proteins whose main function is to enable the bacteria to survive in the host. Thus, a specific immune response is needed in which cytokines are engaged. The aim of this study was to assess the influence of Yersinia outer proteins (Yops) released by Yersinia pseudotuberculosis on the production of the proinflammatory cytokines, interleukin-12 (IL-12), and tumor necrosis factor alpha (TNF-alpha), and nitric oxide (NO) by murine peritoneal macrophages. To this end, female Swiss mice were infected intravenously with wild-type Y pseudotuberculosis or with mutant strains unable to secrete specific Yops (YopE, YopH, YopJ, YopM, and YpkA). on the 7th, 14th, 21st, and 28th days after infection, the animals were sacrificed and the cytokines and NO were assayed in the peritoneal macrophages culture supernatants. A fall in NO production was observed during the course of infection with all the strains tested, though during the infection with the strains that did not secrete YopE and YopH, the suppression occurred later. There was, in general, an unchanged or sometimes increased production of TNF-alpha between the 7th and the 21st day after infection...

Effect of the essential oil of Achillea millefolium L. in the production of hydrogen peroxide and tumor necrosis factor-alpha in murine macrophages

Lopes, Flávia Cristine Mascia; Benzatti, Fernanda Paulin; Jordão Junior, Cleso Mendonça; Moreira, Raquel Regina Duarte; Carlos, Iracilda Zeppone
Fonte: Divisão de Biblioteca e Documentação do Conjunto das Químicas da Universidade de São Paulo Publicador: Divisão de Biblioteca e Documentação do Conjunto das Químicas da Universidade de São Paulo
Tipo: Artigo de Revista Científica Formato: 401-405
Português
Relevância na Pesquisa
126.02%
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); O efeito do óleo essencial bruto de Achillea millefolium L. (Asteraceae) foi determinado através da liberação de peróxido de hidrogênio (H2O2) e do fator de necrose tumoral-alfa (TNF-alfa) por cultura de macrófagos peritoneais de camundongos Swiss. O azuleno comercial também foi testado e comparado com o óleo essencial. Macrófagos liberam mais de cem compostos biologicamente ativos. Entre esses, citocinas e compostos intermediários do oxigênio como o TNF-alfa e o H2O2. A viabilidade dos macrófagos na presença do óleo foi analisada e as diluições de 1:100 e 1:200 do óleo essencial mostraram os melhores resultados. Pequena liberação de H2O2 e moderada produção de TNF-alfa também foram observadas. Contudo, maior liberação de H2O2 e TNF-alfa foi observada utilizando o azuleno comercial. Desse modo, observou-se que o óleo essencial de A. millefolium foi capaz de estimular os macrófagos peritoneais a produzir H2O2 e TNF-alfa sem causar superprodução desses componentes. Sugere-se que o óleo essencial pode modular a ativação de macrófagos.; Macrophages release more than one hundred compounds into the extracellular environment. Among these, there are cytokines and intermediate oxygen compounds...

Tumor necrosis factor-alpha in gestation and puerperium of women with gestational hypertension and pre-eclampsia

Peraçoli, José Carlos; Rudge, Marilza Vieira Cunha; Serrao Peracoli, Maria Terezinha
Fonte: Blackwell Publishing Publicador: Blackwell Publishing
Tipo: Artigo de Revista Científica Formato: 177-185
Português
Relevância na Pesquisa
126.09%
Problem High plasma levels of tumor necrosis factor-alpha (TNF-alpha) in pregnant women have been associated with the pathogenesis of pre-eclampsia (PE). This study evaluated TNF-alpha plasma levels and monocyte production in gestational hypertension (GH) and PE during gestation and at puerperium.Method of study This study included 128 women, of whom 20 were non-pregnant (NP) normotensive (NT), and 108 were pregnant: 36 NT, 27 with GH, and 45 with PE. Peripheral blood plasma was used for TNF-alpha and uric acid determination. TNF-alpha was determined in plasma and lipopolysaccharide (LPS)-stimulated and non-stimulated monocyte supernatants by L929 bioassay.Results Tumor necrosis factor-alpha and uric acid plasma levels were higher in PE than in GH pregnancies. In both hypertensive groups, these parameters positively correlated and were significantly more elevated than in NT and NP women. TNF-alpha plasma levels and monocyte production were higher in hypertensive than in NT women during gestation, and significantly decreased at puerperium. Although decreased, TNF-alpha release in LPS-stimulated PE monocytes, was still significantly higher than in the other pregnant groups.Conclusion In vivo monocyte activation in GH and PE pregnant women was characterized by in vitro TNF-alpha production. The fact that higher circulating concentrations of TNF-alpha and uric acid were observed in PE than in GH suggests an association with disease severity.

Efeito do fator de necrose tumoral alfa na agregação plaquetária; Effect of tumor necrosis factor alpha on platelet aggregation

Pedro Henrique Leite Bonfitto
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 27/01/2015 Português
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125.97%
As plaquetas são importantes células na inflamação, entretanto, os trabalhos que estudam as citocinas na reatividade plaquetária são raros. O objetivo do presente trabalho foi estudar os efeitos do fator de necrose tumoral-alfa (TNF-α) em plaquetas. Ensaios de agregação foram realizados incubando-se plaquetas com crescentes concentrações de TNF-α (1 – 3000 pg/ml) por diferentes intervalos de tempo (5 – 60 min), na ausência ou presença do antagonista não seletivo dos receptores TNFR1 e TNFR2, o R7050. Também foi estudado o efeito do TNF-α na viabilidade plaquetária utilizando-se o MTT. O efeito do TNF-α na mobilização de Ca2+ em plaquetas foi investigado através de ensaios de fluorescência utilizando-se o fluo-3-AM; os ensaios de western blotting foram realizados para o estudo da ativação da enzima c-Src e do receptor de fibrinogênio. Finalmente, foram determinados os níveis intraplaquetários de AMPc e GMPc por ELISA. O TNF-α inibiu a agregação plaquetária induzida por ADP ou trombina de forma dependente da concentração da citocina e do tempo de incubação. O efeito inibitório máximo do TNF-α na agregação induzida por ADP (5 μM) foi obtido com a concentração de 300 pg/ml por um tempo de incubação de 30 min (90 ± 7% de inibição)...

Naringin Inhibits Tumor Growth and Reduces Interleukin-6 and Tumor Necrosis Factor alpha Levels in Rats with Walker 256 Carcinosarcoma

Camargo, Camila A.; Gomes-Marcondes, Maria Cristina C.; Wutzki, Nathalie C.; Aoyama, Hiroshi
Fonte: Int Inst Anticancer Research; Athens Publicador: Int Inst Anticancer Research; Athens
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
126.05%
The flavonoid naringin is a polyphenolic compound that naturally occurs in citrus. Patients with cancer generally present features of malnutrition and cachexia. Levels of the proinflammatory cytokines tumor necrosis factor alpha (TNF-alpha) and interleukin-6 (IL-6) are raised in patients with cancer. This study was designed to analyze the in vivo effect of naringin in the therapeutic treatment of rats bearing Walker 256 carcinosarcoma (W256). Rats were treated intraperitoneally with different doses of naringin (10, 25 and 35 mg/kg), for 50 days. At 25 mg/kg, naringin inhibited tumor growth by similar to 75%. With this treatment, TNF-alpha and IL-6 levels decreased (p<0.05) in comparison with the control. In addition, two rats presented complete tumor regression. Inhibition of tumor growth, survival increase and the reduction of TNF-alpha and IL-6 levels in rats bearing W256 treated with naringin strongly suggest that this compound has potential as an anticarcinogenic drug.; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Tumor necrosis factor-alpha, interleukin-1beta and interleukin-6 in the cerebrospinal fluid of newborn with meningitis

Krebs,Vera Lúcia Jornada; Okay,Thelma Suely; Okay,Yassuhiko; Vaz,Flávio Adolfo Costa
Fonte: Academia Brasileira de Neurologia - ABNEURO Publicador: Academia Brasileira de Neurologia - ABNEURO
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2005 Português
Relevância na Pesquisa
126.01%
OBJECTIVE: To analyze the usefulness of determining the cerebrospinal fluid(CSF) levels of tumor necrosis factor-alpha(TNF-alpha),interleukin-1beta(IL-1beta) and interleukin-6(IL-6)for the early diagnosis and evaluation of the prognosis of neonatal meningitis. METHOD: We studied 54 newborn that underwent lumbar puncture.Thirty patients had meningitis and 24 were the control group.CSF and sera were obtained at the moment of suspicion of meningitis and stored at -70(0)C.Cytokines were performed by enzyme-linked immunosorbent assay method. RESULTS: CSF cytokines were detected in all the newborn with meningitis.TNF-alpha was detected in the CSF in 63.3% of the neonates, IL-1beta in 73.3% and IL-6 in 96.6%.The CSF levels were significantly higher than serum in neonates with meningitis.There was no correlation between the CSF levels of cytokines and neurologic complications. CONCLUSION: The detection of TNF-alpha, IL-1beta and IL-6 in the CSF is of great value in order to achieve a early diagnosis of neonatal meningitis.Among the three cytokines analyzed, IL-6 was the best indicator of meningeal inflammation.

Increased plasma levels of tumor necrosis factor-alpha in asymptomatic/"indeterminate" and Chagas disease cardiomyopathy patients

Ferreira,Renata Cristina; Ianni,Barbara M; Abel,Lucia CJ; Buck,Paula; Mady,Charles; Kalil,Jorge; Cunha-Neto,Edecio
Fonte: Instituto Oswaldo Cruz, Ministério da Saúde Publicador: Instituto Oswaldo Cruz, Ministério da Saúde
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2003 Português
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126.01%
We compared plasma tumor necrosis factor-alpha (TNF-alpha) levels among asymptomatic/"indeterminate" Chagas disease patients (ASY) and patients across the clinical spectrum of chronic Chagas disease cardiomyopathy (CCC). Idiopathic dilated cardiomyopathy (DCM) patients and normal controls (NC) were included as controls. ASY Chagas disease patients had significantly higher plasma TNF-alpha levels than NC. TNF-alpha levels among severe CCC patients with significant left ventricular (LV) dysfunction were similar to those of DCM patients, showing average 2-fold higher levels than CCC patients without LV dysfunction and ASY patients, and 8-fold higher levels than NC. In Chagas disease, chronic TNF-a production prior to heart failure may play a role in CCC progression.

Inducible nitric oxide synthase and tumor necrosis factor-alpha in delayed gastric emptying and gastrointestinal transit induced by lipopolysaccharide in mice

Inada,T.; Hamano,N.; Yamada,M.; Shirane,A.; Shingu,K.
Fonte: Associação Brasileira de Divulgação Científica Publicador: Associação Brasileira de Divulgação Científica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/11/2006 Português
Relevância na Pesquisa
126.03%
Gastrointestinal motility disturbances during endotoxemia are probably caused by lipopolysaccharide (LPS)-induced factors: candidates include nitric oxide (NO), tumor necrosis factor-alpha (TNF-alpha), interleukin-1ß, and interleukin-6. Flow cytometry was used to determine the effects of LPS and these factors on gastric emptying (evaluated indirectly by determining percent gastric retention; %GR) and gastrointestinal transit (GIT) in male BALB/c mice (23-28 g). NO (300 µg/mouse, N = 8) and TNF-alpha (2 µg/mouse, N = 7) increased (P < 0.01) GR and delayed GIT, mimicking the effect of LPS (50 µg/mouse). During early endotoxemia (1.5 h after LPS), inhibition of inducible NO synthase (iNOS) by a selective inhibitor, 1400 W (150 µg/mouse, N = 11), but not antibody neutralization of TNF-alpha (200 µg/mouse, N = 11), reversed the increase of GR (%GR 78.8 ± 3.3 vs 47.2 ± 7.5%) and the delay of GIT (geometric center 3.7 ± 0.4 vs 5.6 ± 0.2). During late endotoxemia (8 h after LPS), both iNOS inhibition (N = 9) and TNF-alpha neutralization (N = 9) reversed the increase of GR (%GR 33.7 ± 2.0 vs 19.1 ± 2.6% (1400 W) and 20.1 ± 2.0% (anti-TNF-alpha)), but only TNF-alpha neutralization reversed the delay of GIT (geometric center 3.9 ± 0.4 vs 5.9 ± 0.2). These findings suggest that iNOS...

Influence of ?S-globin haplotypes and hydroxyurea on tumor necrosis factor-alpha levels in sickle cell anemia

Laurentino,Marília Rocha; Maia Filho,Pedro Aurio; Barbosa,Maritza Cavalcante; Bandeira,Izabel Cristina Justino; Rocha,Lilianne Brito da Silva; Gonçalves,Romelia Pinheiro
Fonte: Associação Brasileira de Hematologia e Hemoterapia e Terapia Celular Publicador: Associação Brasileira de Hematologia e Hemoterapia e Terapia Celular
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2014 Português
Relevância na Pesquisa
126.21%
Background: Sickle cell anemia is a chronic inflammatory disease characterized by an increased production of proinflammatory cytokines including tumor necrosis factor-alpha. Hydroxyurea, by decreasing the polymerization of hemoglobin, reduces inflammatory states. The effect of the genetic polymorphisms of sickle cell patients on tumor necrosis factor-alpha levels remains unknown. Objective: The aim of this study was to investigate the association of tumor necrosis factor-alpha levels with β-globin haplotypes and the use of hydroxyurea. Methods: A cross-sectional study was performed of 67 patients with sickle cell anemia diagnosed at steady-state in a referral hospital in Fortaleza, Ceará, Brazil. A group of 26 healthy individuals was used as control. βS-haplotype analysis was performed by restriction fragment length polymorphism-polymerase chain reaction. The tumor necrosis factor-alpha levels were measured by the enzyme-linked immunosorbent assay test. Laboratory data (complete blood count and fetal hemoglobin) and information regarding the use of hydroxyurea were obtained from medical records. Statistical analysis was performed using R software with the Kruskal-Wallis and Mann-Whitney tests. Statistical significance was established for p-values < 0.05 for all analyses. Results: The mean age of the participants was 35.48 years. Patients with sickle cell anemia had significantly higher tumor necrosis factor-alpha levels than controls (p-values < 0.0001). Tumor necrosis factor-alpha levels were lower in sickle cell anemia patients who were receiving hydroxyurea treatment than those who were not (p-value = 0.1249). Sickle cell anemia patients with Bantu/n genotype had significantly higher levels than patients with the Bantu/Benin genotype (p-value = 0.0021). Conclusion: In summary...

Effect of the essential oil of Achillea millefolium L. in the production of hydrogen peroxide and tumor necrosis factor-alpha in murine macrophages

Lopes,Flávia Cristine Mascia; Benzatti,Fernanda Paulin; Jordão Junior,Cleso Mendonça; Moreira,Raquel Regina Duarte; Carlos,Iracilda Zeppone
Fonte: Divisão de Biblioteca e Documentação do Conjunto das Químicas da Universidade de São Paulo Publicador: Divisão de Biblioteca e Documentação do Conjunto das Químicas da Universidade de São Paulo
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2005 Português
Relevância na Pesquisa
126.02%
Macrophages release more than one hundred compounds into the extracellular environment. Among these, there are cytokines and intermediate oxygen compounds, such as TNF-alpha and H2O2. We evaluated the effect of the crude essential oil of Achillea millefolium L. (Asteraceae) by determining hydrogen peroxide (H2O2) and tumor necrosis factor-alpha (TNF-alpha) release in cultures of peritoneal macrophages cells from Swiss mice. Commercial azulene was also tested for comparison with the essential oil. The macrophages viability in the presence of the oil was analyzed and the dilutions of 1:100 and 1:200 showed the best results. A mild production of H2O2 and a moderate liberation of TNF-alpha were observed. It was also noticed that H2O2 and TNF-alpha production using commercial azulene was higher than that produced by the oil. The essential oil of A. millefolium was able to stimulate peritoneal macrophages to produce H2O2 and TNF-alpha without causing an overproduction of these compounds. It is suggested that the essential oil can modulate macrophages activation.

Bacterial lipopolysaccharide and tumor necrosis factor alpha synergistically increase expression of human endothelial adhesion molecules through activation of NF-kB and p38 mitogen-activated protein kinase signaling pathways

Jersmann, H.; Hii, C.; Ferrante, J.; Ferrante, A.
Fonte: Amer Soc Microbiology Publicador: Amer Soc Microbiology
Tipo: Artigo de Revista Científica
Publicado em //2001 Português
Relevância na Pesquisa
125.97%
One of the recognized associations of bacterial infection with cardiovascular events is the activation of endothelium and upregulation of adhesion molecules. The two major proinflammatory mediators implicated in the causation of cardiovascular events, bacterial lipopolysaccharide (LPS) and tumor necrosis factor alpha (TNF), were found to cooperate to enhance the adhesive properties of endothelial cells. These caused synergistic upregulation of intercellular adhesion molecule-1, E-selectin, and vascular cell adhesion molecule-1 in human umbilical vein endothelial cells as determined by flow cytometry analysis and enzyme-linked immunosorbent assay. This synergism was not due to TNF causing an upregulation of CD14 expression. Treatment with both LPS and TNF resulted in a marked increase in the translocation of NF-B into the nucleus. The activity of p38 mitogen-activated protein kinase was also synergistically enhanced, while the activity of c-jun N-terminal kinase was increased in an additive manner. The results demonstrate that LPS and TNF act synergistically to upregulate the expression of endothelial cell adhesion molecules, possibly by amplification of signaling pathways upstream of transcription. These findings have implications for the understanding of the acceleration of atherosclerotic events seen in low-grade infections with gram-negative organisms.; Hubertus P. A. Jersmann...

Effect of Tumor Necrosis Factor-Alpha On the Metabolism of Arachidonic Acid in Human Neutrophils

Robinson, B.; Hii, C.; Poulos, A.; Ferrante, A.
Fonte: LIPID RESEARCH INC Publicador: LIPID RESEARCH INC
Tipo: Artigo de Revista Científica
Publicado em //1996 Português
Relevância na Pesquisa
126.04%
Although tumor necrosis factor-alpha (TNF-alpha) has been shown to induce marked changes in the physiology/pathophysiology of cells, little is known about the effects of this cytokine on cellular lipid metabolism. In this study we examined the effects of TNF-alpha on the metabolism of eicosatetraenoic acid (arachidonic acid, (20:4(n-6)) in human neutrophils. Pretreatment of neutrophils with TNF-alpha caused a rapid increase in the incorporation of [1-14C]20:4(n-6) substrate into cellular phosphatidylinositol and phosphatidic acid and a slower rise in the incorporation into phosphatidylcholine and phosphatidylethanolamine. Radioactivity was exclusively associated with the sn-2 position of each molecule. The labeling pattern of other phospholipids, neutral lipids, and eicosanoids was unchanged. TNF-alpha had no effect on the distribution of radioactivity in 1-acyl, 1-alkyl, and 1-alk-1-enyl subclasses of phosphatidylcholine, phosphatidylethanolamine, and triglyceride. Chain elongation, beta-oxidation and desaturation of [1-14C]20:4(n-6) were not modulated by the cytokine. TNF-alpha stimulated the release of [3H]20:4(n-6) from prelabeled neutrophils and also induced the production of endogenous unesterified 20:4(n-6). Concomitantly, treatment with the cytokine caused a decrease in the mass of cellular phosphatidylinositol...

Early expression and cellular localization of proinflammatory cytokines interleukin-1[beta], interleukin-6, and tumor necrosis factor-[alpha] in human traumatic spinal cord injury

Yang, L.; Blumbergs, P.; Jones, N.; Manavis, J.; Sarvestani, G.; Ghabriel, M.
Fonte: Lippincott Williams & Wilkins Publicador: Lippincott Williams & Wilkins
Tipo: Artigo de Revista Científica
Publicado em //2004 Português
Relevância na Pesquisa
126.18%
Study Design. Post-traumatic inflammatory response was studied in 11 human cases of acute spinal cord contusion injury. Objectives. To examine the inflammatory cellular response and the immunocytochemical expression and localization of interleukin-1[beta], internleukin-6, and tumor necrosis factor-[alpha]in human spinal cord after contusion injury. Summary of Background Data. The post-traumatic inflammatory response plays an important role in secondary injury mechanisms after spinal cord injury, and inter-leukin-1[beta], internleukin-6, and tumor necrosis factor-[alpha] are key inflammatory mediators. Methods. The study group comprised 11 patients with spinal cord contusion injury and 2 normal individuals. Histologic and immunocytochemical assessments were undertaken to evaluate the inflammatory cellular response and the immunoexpression of interleukin-1[beta], internleukin-6, and tumor necrosis factor-[alpha] in the injured human spinal cord. The cellular sources of interleukin-1[beta], internleukin-6, and tumor necrosis factor-[alpha] were elucidated by immunofluorescence double-labeled confocal imaging. Results. Increased immunoreactivity of interleukin-1[beta], internleukin-6, and tumor necrosis factor-[alpha]was detected in neurons 0.5 hour after injury...

Modulation of adherence invasion and tumor necrosis factor alpha secretion during the early stages of infection by Strepococcus pneumoniae ClpL

Tu, L.; Jeong, H.Y.; Kwon, H.Y.; Ogunniyi, A.; Paton, J.; Pyo, S.N.; Rhee, D.K.
Fonte: Amer Soc Microbiology Publicador: Amer Soc Microbiology
Tipo: Artigo de Revista Científica
Publicado em //2007 Português
Relevância na Pesquisa
126.03%
Heat shock proteins (HSPs) play a pivotal role as chaperones in the folding of native and denatured proteins and can help pathogens penetrate host defenses. However, the underlying mechanism(s) of modulation of virulence by HSPs has not been fully determined. In this study, the role of the chaperone ClpL in the pathogenicity of Streptococcus pneumoniae was assessed. A clpL mutant adhered to and invaded nasopharyngeal or lung cells much more efficiently than the wild type adhered to and invaded these cells in vitro, as well as in vivo, although it produced the same amount of capsular polysaccharide. However, the level of secretion of tumor necrosis factor alpha (TNF-{alpha}) from macrophages infected with the clpL mutant was significantly lower than the level of secretion elicited by the wild type during the early stages of infection. Interestingly, treatment of the human lung epithelial carcinoma A549 and murine macrophage RAW 264.7 cell lines with cytochalasin D, an inhibitor of actin polymerization, increased adherence of the mutant to the host cells. In contrast, cytochalasin D treatment of RAW 264.7 cells decreased TNF-{alpha} secretion after infection with either the wild type or the mutant. However, pretreatment of cell lines with the actin polymerization activator jasplakinolide reversed these phenotypes. These findings indicate...

Dengue virus (DV) replication in monocyte-derived macrophages is not affected by tumor necrosis factor alpha (TNF-alpha), and DV infection induces altered responsiveness to TNF-alpha stimulation

Wati, S.; Li, P.; Burrell, C.; Carr, J.
Fonte: Amer Soc Microbiology Publicador: Amer Soc Microbiology
Tipo: Artigo de Revista Científica
Publicado em //2007 Português
Relevância na Pesquisa
126.05%
Tumor necrosis factor alpha (TNF-alpha) is believed to play a significant role in the pathogenesis of dengue virus (DV) infection, with elevated levels of TNF-alpha in the sera of DV-infected patients paralleling the severity of disease and TNF-alpha release being coincident with the peak of DV production from infected monocyte-derived macrophages (MDM) in vitro. Since macrophages are a primary cell target in vivo for DV infection, we investigated the potential antiviral role of TNF-alpha in regulating DV replication in MDM. While pretreatment of MDM with TNF-alpha had a minor inhibitory effect, addition of TNF-alpha to MDM with established DV infection had no effect on DV replication as measured by DV RNA levels or progeny virus production. Blocking endogenous TNF-alpha using short interfering RNA or inhibitory TNF-alpha antibodies also had no effect on infectious DV production or viral RNA synthesis. Together, these results demonstrate that DV replication in MDM is not affected by TNF-alpha. Additionally, normal cellular TNF-alpha signaling, measured by quantitation of TNF-alpha-induced stimulation of transcription from an NF-kappaB-responsive reporter plasmid or NF-kappaB protein nuclear translocation, was blocked in DV-infected MDM and Huh7 cells. Thus...

La sobre-expresión crónica del factor de necrosis tumoral alfa en la substantia nigra induce neurodegeneración y síntomas motores; Chronic overexpression of tumor necrosis factor alpha in the substantia nigra elicits progressive neurodegeneration and motor symptoms

De Lella Ezcurra, Ana Laura
Fonte: Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires Publicador: Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires
Tipo: info:eu-repo/semantics/doctoralThesis; tesis doctoral; info:eu-repo/semantics/publishedVersion Formato: application/pdf
Publicado em //2010 Português
Relevância na Pesquisa
126.07%
La neuroinflamación es considerada una característica neuropatológica de la enfermedad de Parkinson. Se ha observado activación de microglía y niveles elevados de citoquinas pro-inflamatorias, entre las que se encuentra el factor de necrosis tumoral alfa (TNF-α), en la substantia nigra, una de las principales regiones del cerebro afectadas en esta enfermedad. Sin embargo, el rol funcional de la activación microglial y la sobre-expresión de TNF-α no es claro en la enfermedad de Parkinson. El objetivo de este trabajo fue determinar los efectos de la sobre-expresión crónica de TNF-α en la substantia nigra, e identificar moléculas candidatas a mediar ese efecto. Para ello, se inyectó en la substantia nigra de ratas adultas un adenovector que expresa TNF-α (AdTNFα), pudiendo detectarse la citoquina recombinante hasta 14 días p.i. La expresión crónica de TNF-α indujo una pérdida progresiva de neuronas en la substantia nigra, que comenzó el día 14 y se acentuó a los 21 y 28 días p.i., comparado con animales controles inyectados con un adenovector que expresa β- galactosidasa (Adβgal). La sobre-expresión de TNF-α produjo la aparición de síntomas motores a los 14 días p.i.; y la activación de la microglía y/o reclutamiento de macrófagos de la periferia desde el día 7 luego de la inoculación. No se pudo detectar inducción de IL-1β ni evidencias de apoptosis. En cambio...

Participación del factor de necrosis tumoral alfa en la proliferación de carcinomas mamarios; Tumor necrosis factor alpha involvement in breast cancer cell proliferation

Rivas, Martín Alfredo
Fonte: Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires Publicador: Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires
Tipo: info:eu-repo/semantics/doctoralThesis; tesis doctoral; info:eu-repo/semantics/publishedVersion Formato: application/pdf
Publicado em //2010 Português
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126.11%
El factor de necrosis tumoral alfa (TNFα) es una citoquina pro-inflamatoria implicada en promover el crecimiento de ciertos tipos de cánceres. En el presente trabajo de Tesis se exploraron los caminos de señalización intracelulares que llevan al crecimiento de las células de cáncer de mama inducido por TNFα y su interacción con el receptor tirosina quinasa tipo I, ErbB-2. Nuestros resultados indicaron que el TNFα, actuando a través del receptor de TNFα tipo 1 (TNFR1), indujo la activación de las quinasas activadas por mitógenos p42 y p44 (p42/p44 MAPK), la quinasa del amino terminal de c-jun (JNK) y la fosfatidilinositol 3-fosfato quinasa / Akt (PI3-K/Akt), la activación del factor de transcripción Factor Nuclear κB (NF-κB) y la proliferación celular. También comprobamos que la administración de TNFα in vivo indujo el crecimiento del tumor C4HD en ratones Balb/c y que el tratamiento con un inhibidor selectivo de NF-κB, Bay 11-7082, resultó en la regresión parcial de dicho tumor de mama. Asimismo, el Bay 11-7082 bloqueó la capacidad del TNFα de inducir el aumento de la proteína promotora del ciclo celular ciclina D1 y de la proteína antiapoptótica Bcl-XL. Un importante hallazgo fue demostrar que el TNFα indujo la transactivación de ErbB-2 en células de cáncer de mama que sobreexpresan ErbB-2. En estas células...

Effect of the essential oil of Achillea millefolium L. in the production of hydrogen peroxide and tumor necrosis factor-alpha in murine macrophages; Efeito do óleo essencial de Achillea millefollium L. na produção de peróxido de hidrogênio e fator de necrose tumoral-alfa por macrófagos murinos

Lopes, Flávia Cristine Mascia; Benzatti, Fernanda Paulin; Jordão Junior, Cleso Mendonça; Moreira, Raquel Regina Duarte; Carlos, Iracilda Zeppone
Fonte: Universidade de São Paulo. Faculdade de Ciências Farmacêuticas Publicador: Universidade de São Paulo. Faculdade de Ciências Farmacêuticas
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Artigo Avaliado pelos Pares Formato: application/pdf
Publicado em 01/09/2005 Português
Relevância na Pesquisa
126.02%
Macrophages release more than one hundred compounds into the extracellular environment. Among these, there are cytokines and intermediate oxygen compounds, such as TNF-alpha and H2O2. We evaluated the effect of the crude essential oil of Achillea millefolium L. (Asteraceae) by determining hydrogen peroxide (H2O2) and tumor necrosis factor-alpha (TNF-alpha) release in cultures of peritoneal macrophages cells from Swiss mice. Commercial azulene was also tested for comparison with the essential oil. The macrophages viability in the presence of the oil was analyzed and the dilutions of 1:100 and 1:200 showed the best results. A mild production of H2O2 and a moderate liberation of TNF-alpha were observed. It was also noticed that H2O2 and TNF-alpha production using commercial azulene was higher than that produced by the oil. The essential oil of A. millefolium was able to stimulate peritoneal macrophages to produce H2O2 and TNF-alpha without causing an overproduction of these compounds. It is suggested that the essential oil can modulate macrophages activation.; O efeito do óleo essencial bruto de Achillea millefolium L. (Asteraceae) foi determinado através da liberação de peróxido de hidrogênio (H2O2) e do fator de necrose tumoral-alfa (TNF-alfa) por cultura de macrófagos peritoneais de camundongos Swiss. O azuleno comercial também foi testado e comparado com o óleo essencial. Macrófagos liberam mais de cem compostos biologicamente ativos. Entre esses...