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1.
São Paulo; s.n; s.n; 2021. 79 p. graf, tab.
Thesis in English | LILACS | ID: biblio-1396698

ABSTRACT

Jaboticaba (Plinia jaboticaba (Vell.) Berg) is a Brazilian native fruit belonging to the Myrtaceae family. Previously it was demonstrated that phenolicrich extracts from jaboticaba (PEJ) possess health-beneficial properties in dietinduced obesity; however, whether PEJ modulates the obesity-associated intestinal inflammatory status remains unclear. The objective of the present study was to evaluate the effect of PEJ on intestinal inflammation associated with obesity induced by a high-fat-sucrose (HFS) diet. Thus, forty male C57BL/6J mice were distributed into two groups: negative control (CH, 10 animals), fed standard diet AIN96M and water ad libitum; and positive control (HFS, 30 animals), fed HFS diet and water ad libitum induced to obesity for an initial period of 14 weeks. After this period, the HFS group was redistributed in three groups of 10 animals each, and continuously fed HFS diet for another 14 weeks: HFS group received daily gavages of water, PEJ1 group received PEJ at the dose of 50 mg of gallic acid equivalent (GAE)/kg body weight (BW and PEJ2 group received PEJ at the dose of 100 mg GAE/kg BW. Feed intake and body mass were monitored weekly, and fasting glucose biweekly. The initial period of obesity-induction demonstrated that the HFS diet was efficient to promote a significant body weight gain and fasting hyperglycemia when compared to the negative control group (CH). At the end of the experiment the animals were euthanized under anesthesia and their organs and tissues were collected. The major classes of phenolic compounds found in PEJ were ellagitannins, anthocyanins including cyanidin and delphinidin glycosides, proanthocyanidins, and free ellagic acid. PEJ-treated animals presented a reduced body weight gain, adiposity and demonstrated significant reversion of insulin resistance and dyslipidemia. In addition, the inflammatory profile of colon demonstrated that PEJ prevented metabolic endotoxemia linked to an attenuation of the HFS diet-induced intestinal inflammation via downregulation of pro-inflammatory mediators such as tumor necrosis factor (TNF-ß), membrane transporter toll-like receptor-4 (TLR-4) and nuclear factor-κB (NF-κB) in the colon. These anti-inflammatory effects appear to be involved, at least in part, with an inhibition of the colonic inflammasome pathway of obese mice. Collectively, our data reveals that PEJ exerts a direct anti-inflammatory effect in obesity-associated intestinal inflammation and this outcome is linked to an amelioration of metabolic endotoxemia in obese mice


A jabuticaba (Plinia jaboticaba (Vell.) Berg) é uma fruta nativa brasileira pertencente à família Myrtaceae. Anteriormente, foi demonstrado que extratos ricos em fenólicos de jabuticaba (PEJ) possuem propriedades benéficas à saúde na obesidade induzida por dieta; no entanto, se o PEJ modula o estado inflamatório intestinal associado à obesidade ainda não está claro. O objetivo do presente estudo foi avaliar o efeito do PEJ na inflamação intestinal associada à obesidade induzida por uma dieta rica em sacarose (HFS). Assim, quarenta camundongos C57BL / 6J machos foram distribuídos em dois grupos: controle negativo (CH, 10 animais), alimentados com dieta padrão AIN96M e água ad libitum; e controle positivo (HFS, 30 animais), alimentado com dieta HFS e água ad libitum induzida à obesidade por um período inicial de 14 semanas. Após este período, o grupo HFS foi redistribuído em três grupos de 10 animais cada, e continuamente alimentado com dieta HFS por mais 14 semanas: o grupo HFS recebeu gavagens diárias de água, o grupo PEJ1 recebeu PEJ na dose de 50 mg de ácido gálico equivalente (GAE) / kg de peso corporal (pc) e o grupo PEJ2 recebeu PEJ na dose de 100 mg GAE / kg pc. O consumo de ração e a massa corporal foram monitorados semanalmente e a glicemia de jejum quinzenal. O período inicial de indução da obesidade demonstrou que a dieta HFS foi eficiente em promover significativo ganho de peso corporal e hiperglicemia de jejum quando comparada ao grupo controle negativo (HC). Ao final do experimento os animais foram submetidos à eutanásia sob anestesia e seus órgãos e tecidos coletados. As principais classes de compostos fenólicos encontrados em PEJ foram elagitaninos, antocianinas incluindo cianidina e delfinidina glicosiladas, proantocianidinas e ácido elágico livre. Os animais tratados com PEJ apresentaram redução do ganho de peso corporal, adiposidade e reversão significativa da resistência à insulina e dislipidemia. Além disso, o perfil inflamatório do cólon demonstrou que o PEJ evitou a endotoxemia metabólica ligada a uma atenuação da inflamação intestinal induzida pela dieta de HFS por meio da regulação negativa de mediadores pró-inflamatórios, como o fator de necrose tumoral (TNF-), transportador de membrana toll- como o receptor 4 (TLR-4) e o fator nuclear B (NF-B) no cólon. Esses efeitos anti-inflamatórios parecem estar envolvidos, pelo menos em parte, com uma inibição da via do inflamassoma colônico de camundongos obesos. Coletivamente, nossos dados revelam que o PEJ exerce um efeito anti-inflamatório direto na inflamação intestinal associada à obesidade e esse resultado está relacionado com uma melhora da endotoxemia metabólica em camundongos obesos


Subject(s)
Animals , Male , Mice , Myrtaceae/classification , Phenolic Compounds , Fruit/metabolism , Insulin Resistance , Weight Gain , Tumor Necrosis Factor-alpha/adverse effects , Diet , Eating , Mice, Obese/classification , Anti-Inflammatory Agents/adverse effects , Obesity/drug therapy
2.
Actual. osteol ; 15(1): 34-43, ene. abr. 2019. ilus.
Article in Spanish | LILACS | ID: biblio-1049002

ABSTRACT

La brucelosis es una de las enfermedades zoonóticas más importantes a nivel mundial capaz de producir enfermedad crónica en los seres humanos. La localización osteoarticular es la presentación más común de la enfermedad activa en el hombre. Sin embargo, algunos de los mecanismos moleculares implicados en la enfermedad osteoarticular han comenzado a dilucidarse recientemente. Brucella abortus induce daño óseo a través de diversos mecanismos en los cuales están implicados TNF-α y RANKL. En estos procesos participan células inflamatorias que incluyen monocitos/macrófagos, neutrófilos, linfocitos T del tipo Th17 y linfocitos B. Además, B. abortus puede afectar directamente las células osteoarticulares. La bacteria inhibe la deposición de la matriz ósea por los osteoblastos y modifica el fenotipo de estas células para producir metaloproteinasas de matriz (MMPs) y la secreción de citoquinas que contribuyen a la degradación del hueso. Por otro lado, la infección por B. abortus induce un aumento en la osteoclastogénesis, lo que aumenta la resorción de la matriz ósea orgánica y mineral y contribuye al daño óseo. Dado que la patología inducida por Brucella afecta el tejido articular, se estudió el efecto de la infección sobre los sinoviocitos. Estos estudios revelaron que, además de inducir la activación de estas células para secretar quemoquinas, citoquinas proinflamatorias y MMPs, la infección inhibe la muerte por apoptosis de los sinoviocitos. Brucella es una bacteria intracelular que se replica en el retículo endoplásmico de los macrófagos. El análisis de los sinoviocitos infectados con B. abortus indicó que las bacterias también se multiplican en el retículo endoplasmático, lo que sugiere que la bacteria podría usar este tipo celular para la multiplicación intracelular durante la localización osteoarticular de la enfermedad. Los hallazgos presentados en esta revisión intentan responder a preguntas sobre los mediadores inflamatorios implicados en el daño osteoarticular causado por Brucella. (AU)


Brucellosis is one of the most important zoonotic diseases that can produce chronic disease in humans worldwide. Osteoarticular involvement is the most common presentation of human active disease. The molecular mechanisms implicated in bone damage have started to be elucidated. B. abortus induces bone damage through diverse mechanisms in which TNF-α and RANKL are implicated. These processes are driven by inflammatory cells, including monocytes/macrophages, neutrophils, Th17 lymphocytes and B cells. Also, Brucella abortus (B. abortus) can directly affect osteoarticular cells. The bacterium inhibits bone matrix deposition by osteoblast and modifies the phenotype of these cells to produce matrix methalloproteinases (MMPs) and cytokine secretion that contribute to bone matrix degradation. B. abortus also affects osteoclast increasing mineral and organic bone matrix resorption and contributing to bone damage. Since the pathology induced by Brucella species involves joint tissue, experiments conducted in sinoviocytes revealed that besides inducing the activation of these cells to secrete chemokines, proinflammatory cytokines and MMPS, the infection also inhibits sinoviocyte apoptosis. Brucella is an intracellular bacterium that replicate in the endoplasmic reticulum of macrophages. The analysis of B. abortus infected sinoviocytes indicated that bacteria also replicate in their reticulum suggesting that the bacterium could use this cell type for intracellular replication during the osteoarticular localization of the disease. The findings presented in this review try to answer key questions about the inflammatory mediators involved in osteoarticular damage caused by Brucella. (AU)


Subject(s)
Humans , Animals , Osteoarthritis/pathology , Brucella abortus/pathogenicity , Brucellosis/pathology , Osteoarthritis/immunology , Osteoblasts/pathology , Osteocytes/microbiology , Osteogenesis/immunology , Brucella abortus/immunology , Brucellosis/etiology , Brucellosis/immunology , B-Lymphocytes/pathology , Cytokines/adverse effects , Tumor Necrosis Factor-alpha/adverse effects , Matrix Metalloproteinases/chemical synthesis , RANK Ligand/adverse effects , Th17 Cells/pathology , Synoviocytes/immunology , Macrophages/pathology , Neutrophils/pathology
3.
Yonsei Medical Journal ; : 1095-1105, 2016.
Article in English | WPRIM | ID: wpr-34056

ABSTRACT

PURPOSE: Appropriate animal models of atherosclerotic plaque are crucial to investigating the pathophysiology of atherosclerosis, as well as for the evaluation of the efficacy and safety of vascular devices. We aimed to develop a novel animal model that would be suitable for the study of advanced atherosclerotic lesions in vivo. MATERIALS AND METHODS: Atherosclerotic plaque was induced in 24 iliac arteries from 12 rabbits by combining a high cholesterol diet, endothelial denudation, and injection into the vessel wall with either saline (n=5), olive oil (n=6), or inflammatory proteins [n=13, high-mobility group protein B1 (HMGB1) n=8 and tumor necrosis factor (TNF)-α n=5] using a Cricket™ Micro-infusion catheter. Optical coherence tomography (OCT) was performed to detect plaque characteristics after 4 weeks, and all tissues were harvested for histological evaluation. RESULTS: Advanced plaque was more frequently observed in the group injected with inflammatory proteins. Macrophage infiltration was present to a higher degree in the HMGB1 and TNF-α groups, compared to the oil or saline group (82.1±5.1% and 94.6±2.2% compared to 49.6±14.0% and 46.5±9.6%, p-value<0.001), using RAM11 antibody staining. On OCT, lipid rich plaques were more frequently detected in the inflammatory protein group [saline group: 2/5 (40%), oil group: 3/5 (50%), HMGB1 group: 6/8 (75%), and TNF-α group: 5/5 (100%)]. CONCLUSION: These data indicate that this rabbit model of atherosclerotic lesion formation via direct injection of pro-inflammatory proteins into the vessel wall is useful for in vivo studies investigating atherosclerosis.


Subject(s)
Animals , Male , Rabbits , Cholesterol, Dietary/administration & dosage , Disease Models, Animal , Endothelium/surgery , HMGB1 Protein/adverse effects , Iliac Artery/diagnostic imaging , Injections, Intra-Arterial , Macrophages , Olive Oil/adverse effects , Plaque, Atherosclerotic/chemically induced , Sodium Chloride/adverse effects , Tomography, Optical Coherence , Tumor Necrosis Factor-alpha/adverse effects
4.
LMJ-Lebanese Medical Journal. 2014; 62 (4): 238-240
in English | IMEMR | ID: emr-153677

ABSTRACT

Tumor necrosis factor [TNF]- alpha inhibitors are being widely and increasingly used for the management of a spectrum of rheumatologic diseases that are refractory to conventional disease modifying anti-rheumatic drugs. Various cutaneous side effects have been reported after treatment with TNF- alpha inhibitors. We present a case report of a 26-year- old male patient who developed a lichenoid drug eruption few months after the initiation of adalimumab for the manage- ment of Crohn's disease. We also highlight the clinical and histopathologic differences between lichenoid drug eruptions and idiopathic lichen planus


Subject(s)
Humans , Male , Antibodies, Monoclonal, Humanized/adverse effects , Tumor Necrosis Factor-alpha/adverse effects , Drug Eruptions , Crohn Disease
5.
An. bras. dermatol ; 86(4): 716-724, jul.-ago. 2011. ilus
Article in Portuguese | LILACS | ID: lil-600614

ABSTRACT

O uso dos inibidores do fator de necrose tumoral no tratamento de pacientes com psoríase vem sendo relacionado a uma maior incidência de tuberculose, particularmente, nas suas formas extrapulmonar e disseminada. Apesar de sua indiscutível eficácia, essas drogas elevam o risco da reativação de infecção tuberculosa latente (ITBL), tornando obrigatório o diagnóstico da referida condição antes da sua administração. A investigação da infecção tuberculosa latente pelo teste cutâneo da tuberculina é falha, dada sua baixa especificidade, além de apresentar resultados duvidosos em pacientes com psoríase. Ensaios baseados na detecção da produção de interferon-gama in vitro por células monoclonais periféricas, estimuladas por antígenos específicos (Esat-6 e CFP-10), parecem oferecer maior acurácia quando comparados ao teste de Mantoux na identificação de infecção tuberculosa latente. Essa ferramenta diagnóstica tem oferecido maior especificidade, já que não apresenta correlação com medidas indiretas de exposição ao M. tuberculosis, como a vacinação por BCG, e com infecções por outras micobactérias.


The use of tumor necrosis factor inhibitors for the treatment of patients with psoriasis has been related to a higher incidence of tuberculosis, specially the disseminated and extrapulmonary forms. Despite their efficacy, these drugs increase the risk of reactivating latent tuberculosis infection, thus requiring diagnosis of the condition before their administration. Investigation of latent tuberculosis infection with tuberculin skin test is ineffective due to its low specificity and the dubious results that it generates in patients with psoriasis. Assays based on the detection of synthesis of gamma interferon in vitro by peripheral monoclonal cells, stimulated by specific antigens (ESAT-6 and CFP-10), seem to offer better accuracy when compared to the Mantoux test in identifying latent tuberculosis infection. This diagnosis tool has demonstrated higher specificity, since it has no correlation with indirect forms of exposure to M. tuberculosis such as BCG vaccination or with infections by other mycobacteria.


Subject(s)
Humans , Latent Tuberculosis/chemically induced , Psoriasis/drug therapy , Tumor Necrosis Factor-alpha/adverse effects , Latent Tuberculosis/diagnosis , Latent Tuberculosis/immunology , Reproducibility of Results , Sensitivity and Specificity , Tumor Necrosis Factor-alpha/immunology , Tumor Necrosis Factor-alpha/therapeutic use
6.
J. bras. pneumol ; 36(2): 243-251, mar.-abr. 2010. ilus, tab
Article in Portuguese | LILACS | ID: lil-546381

ABSTRACT

Desde o início do uso de drogas anti-TNF para o tratamento da artrite reumatoide e outras doenças inflamatórias, casos de tuberculose pulmonar e extrapulmonar vêm sendo notificados em pacientes submetidos a tal tratamento. Na maioria das vezes, a doença se desenvolve durante as seis primeiras infusões. Todo paciente deve ser avaliado para tuberculose latente antes do início do uso de um bloqueador de TNF; no entanto, o diagnóstico de tuberculose latente é um desafio. A prova tuberculínica, o único teste disponível para a detecção de tuberculose latente por quase um século, apresenta uma série de limitações. Testes baseados na detecção da produção de IFN-γ in vitro por células mononucleares ativadas por antígenos específicos parecem ser mais acurados e vêm sendo pesquisados em pacientes com artrite reumatoide.


Since the beginning of the use of anti-TNF in the treatment of rheumatoid arthritis and other inflammatory diseases, cases of pulmonary tuberculosis and extrapulmonary tuberculosis have been reported in patients receiving such treatment. In most cases, the disease develops by the time the patient has received the sixth infusion. Every patient should be evaluated for latent tuberculosis infection prior to the use of a TNF inhibitor. However, the diagnosis of latent tuberculosis infection is a challenge. The tuberculin test, which was the only test available to detect latent tuberculosis infection for nearly a century, presents a number of limitations. Tests based on the detection of the in-vitro production of IFN-γ by mononuclear cells activated by specific antigens appear to be more accurate and have been studied in patients with rheumatoid arthritis.


Subject(s)
Adult , Female , Humans , Arthritis, Rheumatoid/drug therapy , Diagnostic Techniques and Procedures/standards , Interferon-gamma/analysis , Latent Tuberculosis/diagnosis , Tumor Necrosis Factor-alpha/adverse effects , Interferon-gamma/biosynthesis , Latent Tuberculosis/chemically induced , Leukocytes, Mononuclear/metabolism , Tumor Necrosis Factor-alpha/therapeutic use
7.
Arq. bras. med. vet. zootec ; 59(4): 837-843, ago. 2007. tab
Article in Portuguese | LILACS | ID: lil-462174

ABSTRACT

Avaliou-se a inibição da produção do fator de necrose tumoral alfa (TNF-alfa) devido ao pré-tratamento com antiinflamatório esteroidal (dexametasona) e não esteroidal (diclofenaco sódico) em eqüinos com endotoxemia induzida experimentalmente. Foram utilizados 15 cavalos machos não castrados, distribuídos em três grupos de cinco animais: controle (C), diclofenaco sódico (DS) e dexametasona (DM). A endotoxemia subletal foi induzida pela infusão intravenosa (IV) de 0,1mg/kg/pv de lipopolissacarídeo (LPS) de Escherichia coli 055:B5, administrado em 250ml de solução estéril de cloreto de sódio a 0,9 por cento, durante 15min. Os cavalos do grupo-controle foram tratados com solução de cloreto de sódio a 9 por cento IV. Nos animais do grupo DS, administraram-se, por via oral, 2,2mg/kg de diclofenaco sódico e, nos do grupo DM, 1,1mg/kg de dexametasona IV, respectivamente, 60 e 30min antes da infusão da endotoxina. Mensurou-se, por meio de ensaio de toxicidade com células da linhagem L929, a concentração de TNF-alfa no soro e no líquido peritoneal às 0, 1», 3 e 6 horas após injeção do LPS. No grupo-controle, observou-se aumento significativo de TNF-alfa sérico, em relação ao valor basal e aos grupos DS e DM, 1,15 horas após a indução da endotoxemia. No líquido peritoneal, as concentrações observadas estavam abaixo daquelas da curva padrão de TNF-alfa, não havendo diferença entre os grupos (P>0,05)


The inhibition of tumor necrosis factor alpha (TNF-alpha) production due to pre-treatment with steroidal (dexamethazone) and non-steroidal (sodium diclofenac) anti-inflammatories was studied in horses under experimentally induced endotoxemy. Fifteen stallions were allotted into three groups of five animals each: control (C), sodium diclofenac (SD) and dexamethazone (DM). Sublethal endotoxemy was induced with 0.1mg/kg/bw Escherichia coli 055:B5 lipopolysaccharide (LPS), IV, administrated in 250ml of 0.9 percent sterile sodium chloride, during 15 minutes. Control group horses received 9 percent sodium chloride, IV. SD group animals were orally administrated 2.2mg/kg sodium diclofenac and DM horses received 1.1mg/kg dexamethazone, IV, 30 and 60 minutes before endotoxin infusion, respectively. TNF-alpha concentration was measured in serum and peritoneal fluid by toxicity assay using L929 lineage cells at 0, 1», 3 and 6 hours after LPS injection. Ninety minutes after endotoxemy induction, it was verified a significant increase of serum TNF-a concentration in horses from control group in relation to the basal values as well as results of horses from SD and DM groups. In peritoneal fluid, the measured concentrations were lower than those from TNF-a standard curve and difference among the groups was not verified (P>0.05)


Subject(s)
Animals , Male , Anti-Inflammatory Agents , Cytokines/analysis , Dexamethasone/administration & dosage , Dexamethasone/adverse effects , Diclofenac/adverse effects , Endotoxemia/chemically induced , Escherichia coli/pathogenicity , Tumor Necrosis Factor-alpha/adverse effects , Horses
8.
Rev. chil. obes ; 4(2): 47-53, 1999. tab
Article in Spanish | LILACS | ID: lil-260223

ABSTRACT

The mechanism by which obesity leads to type 2 diabetes mellitus is unknown. It is generally agreed that insulin resistance is an invariable accompaniment of obesity but that normoglycemia is maintained by compensatory hiperinsulinemia until the pancreatic B cells become unable to meet the increased demand for insulin, at which point type 2 diabetes mellitus begins. The precise cause of insulin resistance is yet to be determined, but is association with obesity has long been established. Recent data has implied free fatty acids tumoral necrosis factor - alfa, muscle fiber type II b and leptin, as a link resistance and obesity


Subject(s)
Humans , Fatty Acids, Nonesterified/adverse effects , Diabetes Mellitus, Type 2/etiology , Glycogen/chemical synthesis , Liver/metabolism , Insulin Resistance , Muscle Fibers, Fast-Twitch , Obesity/physiopathology , Tumor Necrosis Factor-alpha/adverse effects , Obesity/complications
10.
Med. intensiva ; 13(1): 20-5, 1996.
Article in Spanish | LILACS | ID: lil-195363

ABSTRACT

El síndrome de falla múltiple de órganos (SFMO) es un problema común en las UTIs. En su generación intervienen múltiples agentes tóxicos. El intestino parece ser una fuente importante de los mismos ya que es particularmente sensible a la isquemia y reperfusión. De hecho el acoplamiento DO2-VO2 se observa antes que en el resto del organismo. Esto lo convierte en un gatillo de lesión a distancia, permitiendo el paso de mediadores a la circulación general con reinicio sistémico del ciclo liberación-lesión


Subject(s)
Humans , Alprostadil/adverse effects , Endotoxins/adverse effects , Free Radical Scavengers/adverse effects , Interleukin-1/adverse effects , Interleukin-2/adverse effects , Intestine, Small/blood supply , Multiple Organ Failure/physiopathology , Reperfusion , Reperfusion Injury/physiopathology , Thromboxane A2/adverse effects , Tumor Necrosis Factor-alpha/adverse effects , Splanchnic Circulation/physiology , Free Radicals/adverse effects , Free Radicals/classification , Inflammation Mediators/adverse effects , Reperfusion Injury/complications , Reperfusion Injury/etiology , Superoxide Dismutase/pharmacology
12.
Antioxid. calid. vida ; 1(3): 20-4, dic. 1994. ilus, tab
Article in Spanish | LILACS | ID: lil-215684

ABSTRACT

La sepsis y sus complicaciones, el shock séptico y el síndrome de disfunción orgánica múltiple (MODS - multiple organ dysfunction syndrome) mantienen desde hace años el triste privilegio de ser las primeras causas de muerte en las salas de terapia intensiva y postquirúrgica; el aumento de su incidencia está en relación con el desarrollo de procedimientos más invasivos, los tratamientos inmunosupresores, la quimioterapia, la mayor edad de los enfermos, los síndromes de inmunodeficiencia y las floras hospitalarias multirresistentes. Se estima en 400.000 el número de pacientes afectados anualmente en los Estados Unidos y, a pesar de sofisticados y extremadamente caros procedimientos de sostén vital y de los antibióticos, la mortalidad no ha disminuido en los últimos años. Probablemente, esta detención en el progreso terapéutico, se deba a la extrema complejidad de los mecanismos patogénicos en juego y a lo incompleto de su conocimiento y comprensión. El problema de las infecciones graves y de la sepsis (del griego putrefacción), es antiguo y acompaña al hombre desde sus orígenes remotos, como ejemplo de lo cual, basta recordar la peste, la fiebre tifoidea, la gangrena, la peritonitis y las infecciones puerperales. En realidad se trata de un enfrentamiento ancestral entre bacterias y organismos superiores, en el que, desafortunadamente, a menudo triunfan las primeras


Subject(s)
Humans , Free Radicals/adverse effects , Kinins/adverse effects , Multiple Organ Failure/physiopathology , Nitric Oxide/adverse effects , Sepsis/physiopathology , Shock, Septic/physiopathology , Shock, Septic/drug therapy , Eicosanoids/adverse effects , Platelet Activating Factor/adverse effects , Interleukin-1/adverse effects , Kinins/physiology , Multiple Organ Failure/drug therapy , Sepsis/drug therapy , Tumor Necrosis Factor-alpha/adverse effects
15.
Rev. Inst. Nac. Enfermedades Respir ; 6(2): 63-70, abr.-jun. 1993. tab, ilus
Article in Spanish | LILACS | ID: lil-134862

ABSTRACT

Los modelos experimentales de asbestosis han demostrado que la respuesta inflamatoria inicial está mediada por macrófagos alveolares (MA). Aunque la atracción y acumulación de MA vistos en nuestros modelos está fundamentalmente mediada por el complemento, se ha sugerido la participación de otros factores quimiotácticos no bien caracterizados. En este trabajo, buscamos la presencia de factores quimiotácticos en ratas instiladas con asbesto en forma aguda. Demostramos morfoñlógicamente que el depósito de fibras, la respuesta macrofágica y las lesiones inducidas, son equivalentes a lo reportado en modelos por inhalación. Evaluamos la actividad quimiotáctica en el lavado broncoalveolar (LBA) fraccionado de acuerdo a su peso molecular (PM), y la presencia de albúmina y complemento. Encontramos actividad quimiotáctica en las fracciones del LBA correspondientes a picos de alto y bajo PM. La actividad del primer pico se atribuyó al complemento. La actividad del segundo, aumentó conforme al tiempo de exposición y no parece estar relacionada con complemento. Para identificar otros factores quimiotácticos diferentesa complemento, determinamos la presencia de factor de necrosis tumoral (TNFÿ) y fibronectina (FN) en los LBA no fraccionados. No se detectaron diferencias en la cantidad de TNF presente en los diferentes grupos. Observamos un incremento en la concentración de FN en relación al tiempo de exposición. Aunque la presencia de fracciones de FN pudiera explicar parcialmente el fenómeno quimiotáctico observado con el pico de bajo úPM, no podemos descartar la participación de otros factores no identificados


Subject(s)
Animals , Rats , Asbestosis/physiopathology , Chemotactic Factors/administration & dosage , Pulmonary Alveoli/physiopathology , Asbestosis/etiology , Chemotactic Factors/immunology , Fibronectins/adverse effects , Fibronectins/toxicity , Tumor Necrosis Factor-alpha/adverse effects , Tumor Necrosis Factor-alpha/toxicity
16.
Article in Spanish | LILACS | ID: lil-130957

ABSTRACT

El factor de necrosis tumoral (TNF) alfa (caquectina) y beta (linfotoxina) son citoquinas involucradas en un amplio espectro de actividades biológicas. La inflamación, reparación tisular, coagulación, crecimiento y diferenciación de células hematopoyéticas progenitoras, mecanismos efectores de la respuesta inmune, bacteremia por gram negativos, choque séptico, actividad antitumoral, reacción injerto versus huésped están relacionadas a la bioactividad de TNF. Sus efectos secundarios han sido neutralizados terapéuticamente mediante el uso de anticuerpos monoclonales antilipopolisacáridos y anti TNF, inmunoadhesina contra el receptor TNF, Pentoxifilina, Cloroquina, Dexametasona y Colchicina. Debido a sus eficaces resultados in vitro, el TNF ha sido usado en enfermedadesmalignas en forma regional mediante la infusión arterial o como inmunoquimioterapia sistémica


Subject(s)
Humans , In Vitro Techniques , Lymphotoxin-alpha/therapeutic use , Tumor Necrosis Factor-alpha/therapeutic use , Adjuvants, Immunologic/therapeutic use , Antineoplastic Agents/pharmacology , Antibodies, Monoclonal/therapeutic use , Bacterial Infections/drug therapy , Graft Rejection/drug effects , Lymphotoxin-alpha/adverse effects , Tumor Necrosis Factor-alpha/adverse effects
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