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1.
Mediators Inflamm ; 2019: 1872593, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-31949423

RESUMEN

Multiple sclerosis (MS) is an inflammatory disease of the central nervous system (CNS). Experimental Autoimmune Encephalomyelitis (EAE) is the most widely used animal model for the study of MS. The Suppressor of Cytokine Signaling (SOCS) 2 protein plays a critical role in regulating the immune responses. The role of SOCS2 during EAE has not been explored. EAE was induced in WT and SOCS2-/- mice using myelin oligodendrocyte glycoprotein (MOG35-55) peptide. Brain and spinal cord were examined during the peak (day 14) and recovery phase (day 28) of the disease. SOCS2 was upregulated in the brain of WT mice at the peak and recovery phase of EAE. The development of the acute phase was slower in onset in SOCS2-/- mice and was associated with reduced number of Th1 (CD3+CD4+IFN-γ +) cells in the spinal cord and brain. However, while in WT mice, maximal clinical EAE score was followed by a progressive recovery; the SOCS2-/- mice were unable to recover from locomotor impairment that occurred during the acute phase. There was a prolonged inflammatory response (increased Th1 and decreased Th2 and T regulatory cells) in the late phase of EAE in the CNS of SOCS2-/- mice. Transplantation of bone marrow cells from SOCS2-/- into irradiated WT mice resulted in higher lethality at the early phase of EAE. Altogether, these results suggest that SOCS2 plays a dual role in the immune response during EAE. It is necessary for damage during the acute phase damage but plays a beneficial role in the recovery stage of the disease.


Asunto(s)
Encefalomielitis Autoinmune Experimental/inmunología , Encefalomielitis Autoinmune Experimental/metabolismo , Proteínas Supresoras de la Señalización de Citocinas/metabolismo , Animales , Western Blotting , Sistema Nervioso Central/inmunología , Sistema Nervioso Central/metabolismo , Encefalomielitis Autoinmune Experimental/genética , Femenino , Citometría de Flujo , Inflamación/inmunología , Inflamación/metabolismo , Ratones , Ratones Endogámicos C57BL , Ratones Noqueados , Proteínas Supresoras de la Señalización de Citocinas/genética , Células TH1/metabolismo , Células Th17/metabolismo , Células Th2/metabolismo
2.
Infect Immun ; 82(8): 3127-40, 2014 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-24818665

RESUMEN

Infection with Plasmodium falciparum may result in severe disease affecting various organs, including liver, spleen, and brain, resulting in high morbidity and mortality. Plasmodium berghei Anka infection of mice recapitulates many features of severe human malaria. The aryl hydrocarbon receptor (AhR) is an intracellular receptor activated by ligands important in the modulation of the inflammatory response. We found that AhR-knockout (KO) mice infected with P. berghei Anka displayed increased parasitemia, earlier mortality, enhanced leukocyte-endothelial cell interactions in the brain microvasculature, and increased inflammation in brain (interleukin-17 [IL-17] and IL-6) and liver (gamma interferon [IFN-γ] and tumor necrosis factor alpha [TNF-α]) compared to infected wild-type (WT) mice. Infected AhR-KO mice also displayed a reduction in cytokines required for host resistance, including TNF-α, IL-1ß, and IFN-γ, in the brain and spleen. Infection of AhR-KO mice resulted in an increase in T regulatory cells and transforming growth factor ß, IL-6, and IL-17 in the brain. AhR modulated the basal expression of SOCS3 in spleen and brain, and P. berghei Anka infection resulted in enhanced expression of SOCS3 in brain, which was absent in infected AhR-KO mice. These data suggest that AhR-mediated control of SOCS3 expression is probably involved in the phenotype seen in infected AhR-KO mice. This is, to our knowledge, the first demonstration of a role for AhR in the pathogenesis of malaria.


Asunto(s)
Factores de Transcripción con Motivo Hélice-Asa-Hélice Básico/inmunología , Factores de Transcripción con Motivo Hélice-Asa-Hélice Básico/metabolismo , Malaria/inmunología , Malaria/patología , Plasmodium berghei/inmunología , Receptores de Hidrocarburo de Aril/inmunología , Receptores de Hidrocarburo de Aril/metabolismo , Proteínas Supresoras de la Señalización de Citocinas/inmunología , Proteínas Supresoras de la Señalización de Citocinas/metabolismo , Animales , Factores de Transcripción con Motivo Hélice-Asa-Hélice Básico/genética , Encéfalo/inmunología , Encéfalo/patología , Citocinas/inmunología , Citocinas/metabolismo , Eliminación de Gen , Humanos , Hígado/inmunología , Hígado/patología , Malaria/parasitología , Ratones , Ratones Endogámicos C57BL , Ratones Noqueados , Receptores de Hidrocarburo de Aril/genética , Bazo/inmunología , Proteína 3 Supresora de la Señalización de Citocinas
3.
Neuroimmunomodulation ; 21(2-3): 152-8, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-24557049

RESUMEN

The etiopathogenesis of obsessive-compulsive disorder (OCD) remains elusive. Clinical observation of the elevated frequency of obsessive-compulsive symptoms in patients with rheumatic fever, a post-streptococcal autoimmune disease, prompted the study of immune parameters in OCD. Anti-basal ganglia antibodies have been described in a subset of OCD patients. The assessment of circulating cytokines and immune cells confirmed unequivocal changes in at least some patients, although it is difficult to establish a particular immune profile in OCD. Several factors, including the use of psychotropic drugs and the presence of comorbid conditions, seem to influence these immune parameters.


Asunto(s)
Trastorno Obsesivo Compulsivo/inmunología , Animales , Humanos
4.
Neuropsychobiology ; 69(1): 6-10, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-24401207

RESUMEN

BACKGROUND AND OBJECTIVE: The etiopathogenesis of autism spectrum disorders (ASD) is largely unknown, but it seems to involve dysfunction in several biological systems. Among many possible biological pathways, the immune system has emerged as potentially involved. Recent studies have shown association between cytokines (molecules that mediate immune cell interaction) and ASD. Adipokines are cytokines secreted mainly by adipose tissue and may have systemic effects. The main objective of this study was to compare the plasma levels of three adipokines between patients with ASD and healthy controls. Another aim was to correlate the levels of these adipokines and the severity of autistic symptoms as measured by the Social Responsiveness Scale (SRS). METHODS: We collected plasma from 30 patients and 19 controls and measured the levels of adiponectin, leptin and resistin using a commercially available kit. We also used the SRS as a tool to assess the severity of autistic symptoms. RESULTS: We found decreased levels of resistin, increased levels of leptin and unaltered levels of adiponectin in plasma from ASD subjects in comparison with controls. There was also a negative correlation between the levels of adiponectin and the severity of symptoms as assessed by the SRS. CONCLUSION: There are significant changes in the plasma levels of adipokines from patients with ASDs. They suggest the occurrence of systemic changes in ASD and may be hallmarks of the disease.


Asunto(s)
Adiponectina/sangre , Trastornos Generalizados del Desarrollo Infantil/sangre , Leptina/sangre , Resistina/sangre , Estudios de Casos y Controles , Niño , Humanos , Índice de Severidad de la Enfermedad
5.
Neuro Endocrinol Lett ; 35(5): 380-4, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-25275256

RESUMEN

OBJECTIVES: Evaluate the levels of a neurotrophic factor and some neurotrophins in the plasma of patients with Autism Spectrum Disorders (ASD). DESIGN: This study enrolled 30 children with ASD and 19 healthy children. Plasma levels of the neurotrophins BDNF, NGF, NT3, NT4 and of the neurotrophic factor GDNF were measured by Enzyme-Linked Immunosorbent Assay. SETTING: The etiopathogenesis of ASD is largely unknown, but it seems to involve dysfunction in several biological systems. One of these systems comprises the neurotrophic factors, which are molecules involved in many processes in the central nervous system, including neuronal survival, synaptogenesis and synaptic plasticity. Recent studies have shown association between neurotrophic factors and ASD. RESULTS: No differences in plasma BDNF, NGF, NT3, NT4 and GDNF were found between ASD and control. Neurotrophic factors are not altered in ASD. CONCLUSIONS: These molecules may play a minor role in ASD.


Asunto(s)
Trastornos Generalizados del Desarrollo Infantil/sangre , Trastornos Generalizados del Desarrollo Infantil/epidemiología , Factores de Crecimiento Nervioso/sangre , Adolescente , Adulto , Factor Neurotrófico Derivado del Encéfalo/sangre , Niño , Preescolar , Femenino , Factor Neurotrófico Derivado de la Línea Celular Glial/sangre , Humanos , Masculino , Edad Materna , Persona de Mediana Edad , Factor de Crecimiento Nervioso/sangre , Plasticidad Neuronal/fisiología , Neurotrofina 3/sangre , Factores de Riesgo , Adulto Joven
6.
BMC Neurosci ; 14: 19, 2013 Feb 07.
Artículo en Inglés | MEDLINE | ID: mdl-23391218

RESUMEN

BACKGROUND: The neuroinflammatory response aimed at clearance of herpes simplex virus-1 (HSV-1) plays a key role in the pathogenesis of neuroaxonal damage in herpetic encephalitis. Leukocytes activated in an adaptive immune response access brain tissue by passing through the blood-brain barrier. The chemokine CCL5/RANTES is involved in recruitment of these cells to the brain acting via the receptors CCR1, CCR3 and mainly CCR5. Here, we evaluated the role of CCR5 on traffic of leukocytes in the brain microvasculature, cellular and cytokines profile in a severe form of herpetic encephalitis. RESULTS: Wild type and mice lacking CCR5 (CCR5-/-) were inoculated intracerebrally with 104 PFU of neurotropic HSV-1. We evaluated the traffic of leukocytes in the brain microvasculature using intravital microscopy and the profile of cytokines by Enzyme-Linked Immunosorbent Assay at 1 day post infection. Flow cytometry and histopathological analyses were also carried out in brain tissue. Absence of CCR5 leads to lower viral load and an increased leukocyte adhesion in brain microvasculature, predominantly of neutrophils (CD11+ Ly6G+ cells). Moreover, there was a significant increase in the levels of MIP-1/CCL2, RANTES/CCL5, KC/CXCL1 and MIG/CXCL9 in the brain of infected CCR5-/- mice. CONCLUSIONS: These results suggest that the absence of CCR5 may boost the immune response with a high neutrophil recruitment which most likely helps in viral clearance. Nonetheless, the elevated immune response may be detrimental to the host.


Asunto(s)
Encefalitis por Herpes Simple/inmunología , Encefalitis por Herpes Simple/patología , Regulación de la Expresión Génica/genética , Infiltración Neutrófila/fisiología , Receptores CCR5/deficiencia , Animales , Antígenos Ly/metabolismo , Encéfalo/inmunología , Encéfalo/patología , Encéfalo/virología , Adhesión Celular/genética , Adhesión Celular/inmunología , Citocinas/metabolismo , Modelos Animales de Enfermedad , Encefalitis por Herpes Simple/genética , Ensayo de Inmunoadsorción Enzimática , Citometría de Flujo , Leucocitos/fisiología , Ratones , Ratones Endogámicos C57BL , Ratones Noqueados , Receptores CCR5/genética
7.
Exp Parasitol ; 125(3): 271-8, 2010 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-20138873

RESUMEN

Experimental cerebral malaria is a neuroinflammatory condition that results from the host immune response to the parasite. Using intravital microscopy, we investigated leukocyte recruitment in the brain microcirculation and the temporal relationship of this process to the behavioral changes observed in Plasmodium berghei (strain ANKA)-infected C57Bl/6 mice. We found that leukocyte recruitment was increased from day 5 post-infection (p.i.) onwards. Histopathological changes and increased levels of inflammatory cytokines in the brain were also observed. Behavioral performance evaluated by the SHIRPA protocol showed functional impairment from day 6 p.i. onwards. Thus, early leukocyte migration into the brain and associated inflammatory changes may be involved in neurological impairment in parasite-infected C57Bl/6 mice.


Asunto(s)
Encéfalo/patología , Malaria Cerebral/patología , Malaria Cerebral/fisiopatología , Plasmodium berghei/fisiología , Acetilglucosaminidasa/metabolismo , Animales , Conducta Animal , Encéfalo/enzimología , Encéfalo/metabolismo , Encéfalo/parasitología , Quimiocinas/análisis , Macrófagos/enzimología , Malaria Cerebral/parasitología , Ratones , Ratones Endogámicos C57BL , Monocitos/enzimología , Piamadre/irrigación sanguínea
8.
Neurosci Lett ; 736: 135295, 2020 09 25.
Artículo en Inglés | MEDLINE | ID: mdl-32800922

RESUMEN

Herpes simplex virus type 1 (HSV-1) is the main etiological agent of acute and sporadic encephalitis. Proteins of the suppressor of cytokine signaling (SOCS) family have shown to regulate the inflammation during HSV-1 infection in the brain. However, the effects of SOCS2 and SOCS3 in viral encephalitis remain unclear. The aim of the current study is to investigate the potential association between SOCS2, SOCS3, cytokines, and hippocampal damage, especially neuronal apoptosis, during acute intracranial HSV-1 infection in mice. Male C57BL/6 mice were infected by intracranial route with 102 plaque-forming units (PFU) inoculum of purified HSV-1. At three days post-infection (3 d.p.i.), mice were euthanized and their hippocampi were collected for histopathological analysis, immunohistochemical reaction against active caspase-3 and quantification of SOCS2, SOCS3 and cytokines (tumoral necrosis factor (TNF), interleukin (IL) 1ß, IL-6, IL-10; interferon (IFN) -α, IFN-ß, IFN-γ) mRNA expression. Infected mice exhibited neuronal loss and hemorrhagic focus in Cornu Ammonis (CA) region. The apoptotic index was higher in infected mice compared to controls. HSV-1 infection was associated with increased hippocampal expression of TNF, IL1-ß, IL-6 and IFNα/IFNß and decreased expression of IL-10, IFN-γ, SOCS2 and SOCS3. Our results suggest that down regulation of SOCS2 and SOCS3 contributes to a pro-inflammatory environment associated with hippocampal damage and neuronal apoptosis during acute HSV-1 infection in mice.


Asunto(s)
Encefalitis por Herpes Simple/metabolismo , Hipocampo/virología , Inflamación/metabolismo , Proteína 3 Supresora de la Señalización de Citocinas/metabolismo , Proteínas Supresoras de la Señalización de Citocinas/metabolismo , Animales , Apoptosis/fisiología , Chlorocebus aethiops , Citocinas/metabolismo , Hipocampo/metabolismo , Masculino , Ratones , Neuronas/metabolismo , Neuronas/virología , Células Vero
9.
Neurosci Lett ; 445(1): 18-22, 2008 Nov 07.
Artículo en Inglés | MEDLINE | ID: mdl-18782601

RESUMEN

Herpes simplex virus type 1 (HSV-1) is a human pathogen that may cause severe encephalitis. The development of experimental models of HSV-1 encephalitis is relevant for the comprehension of the immune mechanisms involved in this infection. C57BL/6 mice were inoculated intracranially with 10(4) PFU of neurotropic HSV-1. All animals developed signs of encephalitis and died until day 6 post-infection (pi). Using intravital microscopy, we demonstrated increased leukocyte rolling and adhesion in the brain microvasculature of infected mice at days 1, 3 and 5 pi. The infection was followed by a significant increase in chemokine levels, including CCL2, CCL3, CCL5, CXCL1 and CXCL9. TNF-alpha also showed a significant increase at day 3 pi. Histological analyses demonstrated diffuse meningoencephalitis characterized mainly by mononuclear cell infiltrates. The present model of HSV-1 encephalitis exhibits high mortality in the very first days of infection. Accordingly, there were increased rolling and adhesion of leukocytes along the brain endothelium wall and a high expression of chemokines in the central nervous system. These results corroborate the role of chemokines in leukocyte recruitment following HSV-1 infection in the central nervous system.


Asunto(s)
Sistema Nervioso Central/patología , Quimiocinas/metabolismo , Encefalitis por Herpes Simple/patología , Herpesvirus Humano 1 , Leucocitos/fisiología , Regulación hacia Arriba/fisiología , Animales , Movimiento Celular/fisiología , Quimiocinas/genética , Modelos Animales de Enfermedad , Encefalitis por Herpes Simple/metabolismo , Endotelio/patología , Recuento de Leucocitos , Leucocitos/inmunología , Masculino , Ratones , Ratones Endogámicos C57BL , Factores de Tiempo
10.
Acta Ophthalmol Scand ; 85(8): 871-6, 2007 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-17488320

RESUMEN

PURPOSE: Chemokines have been implicated in the control of leucocyte infiltration in uveitis and in modulating angiogenesis in several ocular conditions. Toxoplasmic retinochoroiditis is a common cause of posterior uveitis. This study aimed to evaluate the serum concentrations of CC and CXC chemokines in patients with acute toxoplasmic retinochoroiditis. METHODS: The levels of five chemokines (CCL2, CCL11, CXCL9, CXCL8 and CXCL10) were evaluated in the serum of patients with active toxoplasmic retinochoroiditis (n = 55) and control subjects (n = 40). In a subset of patients (n = 18), a second measure of serum levels of chemokines was performed after the completion of oral treatment with pyrimethamine (25 mg/day), sulphadiazine (1 g, four times per day), folinic acid (7.5 mg/day) and prednisone (initial dose: 1 mg/kg/day) for approximately 30 days. RESULTS: Patients with toxoplasmic retinochoroiditis, notably those presenting with vasculitis, had increased serum levels of CXCL8 (mean +/- standard error of the mean [SEM] 35.1 +/- 6.5 pg/ml) compared with control subjects (mean +/- SEM 16.0 +/- 2.3 pg/ml; p = 0.01). There were no differences between patients and controls in serum levels of the other chemokines measured. The size of ocular lesions correlated significantly with serum levels of CXCL8 and CXCL9. After treatment, there was a significant reduction in serum levels of CXCL8. Severity of vitreous opacities did not correlate with serum levels of these chemokines. CONCLUSIONS: These data suggest a role for CXCL8 in the inflammatory process of acute toxoplasmic retinochoroiditis. Furthermore, CXCL8 may be a useful marker for patient follow-up.


Asunto(s)
Coriorretinitis/sangre , Coriorretinitis/parasitología , Interleucina-8/sangre , Toxoplasmosis Ocular , Enfermedad Aguda , Adulto , Antiinflamatorios/uso terapéutico , Antiprotozoarios/uso terapéutico , Coriorretinitis/patología , Coriorretinitis/fisiopatología , Femenino , Humanos , Leucovorina/uso terapéutico , Masculino , Disco Óptico/patología , Prednisona/uso terapéutico , Pirimetamina/uso terapéutico , Sulfadiazina/uso terapéutico , Toxoplasmosis Ocular/tratamiento farmacológico , Vasculitis/parasitología , Agudeza Visual/efectos de los fármacos
12.
Rev Paul Pediatr ; 34(1): 71-7, 2016.
Artículo en Portugués | MEDLINE | ID: mdl-26525687

RESUMEN

OBJECTIVE: To assess the frequency of overweight and obesity in children and adolescents with autism spectrum disorder (ASD) and with attention deficit/hyperactivity disorder (ADHD) and their parents, in comparison with children and adolescents without developmental disorders. METHODS: Anthropometric measures were obtained in 69 outpatients with ASD (8.4±4.2 years old), 23 with ADHD (8.5±2.4) and 19 controls without developmental disorders (8.6±2.9) between August and November 2014. Parents of patients with ASD and ADHD also had their anthropometric parameters taken. Overweight was defined as a percentile ≥85; obesity as a percentile ≥95; and underweight as a percentile ≤5. For adults, overweight was defined as a BMI between 25 and 30kg/m(2) and obesity as a BMI higher than 30kg/m(2). RESULTS: Children and adolescents with ASD and ADHD had higher BMI percentile (p<0.01) and z-score (p<0.01) than controls, and increased frequency of overweight and obesity (p=0.04). Patients with ASD and ADHD did not differ between them in these variables, nor regarding abdominal circumference. Parents of children with ASD and ADHD did not differ between themselves. CONCLUSIONS: Children and adolescents with ASD and ADHD are at a higher risk of overweight and obesity than children without developmental problems in the community.


Asunto(s)
Trastorno por Déficit de Atención con Hiperactividad/complicaciones , Trastorno Autístico/complicaciones , Obesidad Infantil/epidemiología , Adolescente , Trastorno del Espectro Autista/complicaciones , Estudios de Casos y Controles , Niño , Humanos , Sobrepeso/epidemiología , Padres , Prevalencia
13.
Mol Neurobiol ; 53(9): 6540-6547, 2016 11.
Artículo en Inglés | MEDLINE | ID: mdl-26614512

RESUMEN

Pain is one of the main symptoms of multiple sclerosis, a demyelinating disease of the central nervous system that affects millions of people worldwide. The experimental autoimmune encephalomyelitis (EAE) is considered an experimental model of multiple sclerosis, and besides motor weakness, hypernociception is one of the clinical signs of animals with EAE. In this study, we investigated the influence of some cytokines in the generation of the hypernociceptive response in a mouse model of EAE using MOG35-55. We measured some cytokines in the dorsal root ganglia (DRG), an important anatomical structure involved in pain. We found increased levels of the cytokines TNF-α, IL-1ß, and Kc in DRGs of animals with EAE. We used the antibody IL-1ra to antagonize the effects of IL-1ß, and animals presented a decrease in the hypernociceptive response. Thus, our results suggest that hypernociception in this experimental model of EAE may be a consequence of the increase in some cytokines in DRGs, especially IL-1ß.


Asunto(s)
Encefalomielitis Autoinmune Experimental/complicaciones , Encefalomielitis Autoinmune Experimental/metabolismo , Interleucina-1beta/metabolismo , Dolor/complicaciones , Dolor/metabolismo , Animales , Quimiocina CXCL1/metabolismo , Encefalomielitis Autoinmune Experimental/genética , Encefalomielitis Autoinmune Experimental/fisiopatología , Femenino , Ganglios Espinales/metabolismo , Ganglios Espinales/patología , Proteína Antagonista del Receptor de Interleucina 1/metabolismo , Ratones Endogámicos C57BL , Glicoproteína Mielina-Oligodendrócito , Canal de Sodio Activado por Voltaje NAV1.8/genética , Canal de Sodio Activado por Voltaje NAV1.8/metabolismo , Nocicepción , Dolor/genética , Dolor/fisiopatología , ARN Mensajero/genética , ARN Mensajero/metabolismo , Médula Espinal/metabolismo , Médula Espinal/patología , Canales Catiónicos TRPV/genética , Canales Catiónicos TRPV/metabolismo , Factor de Necrosis Tumoral alfa/metabolismo
14.
J Neuroimmune Pharmacol ; 11(4): 613-621, 2016 12.
Artículo en Inglés | MEDLINE | ID: mdl-27193134

RESUMEN

Herpes simplex virus type 1 (HSV-1) is a human pathogen that may cause severe encephalitis. The exacerbated immune response against the virus contributes to the disease severity and death. Platelet activating factor (PAF) is a mediator capable of inducing increase in vascular permeability, production of cytokines on endothelial cells and leukocytes. We aimed to investigate the activation of PAF receptor (PAFR) and its contribution to the severity of the inflammatory response in the brain following HSV-1 infection. C57BL/6 wild-type (WT) and PAFR deficient (PAFR-/-) mice were inoculated intracranially with 104 plaque-forming units (PFU) of HSV-1. Visualization of leukocyte recruitment was performed using intravital microscopy. Cells infiltration in the brain tissue were analyzed by flow cytometry. Brain was removed for chemokine assessment by ELISA and for histopathological analysis. The pharmacological inhibition by the PAFR antagonist UK-74,505 was also analyzed. In PAFR-/- mice, there was delayed lethality but no difference in viral load. Histopathological analysis of infected PAFR-/- mice showed that brain lesions were less severe when compared to their WT counterparts. Moreover, PAFR-/- mice showed less TCD4+, TCD8+ and macrophages in brain tissue. This reduction of the presence of leukocytes in parenchyma may be mechanistically explained by a decrease in leukocytes rolling and adhesion. PAFR-/- mice also presented a reduction of the chemokine CXCL9 in the brain. In addition, by antagonizing PAFR, survival of C57BL/6 infected mice increased. Altogether, our data suggest that PAFR plays a role in the pathogenesis of experimental HSV-1 meningoencephalitis, and its blockade prevents severe disease manifestation.


Asunto(s)
Herpes Simple/metabolismo , Herpesvirus Humano 1 , Meningoencefalitis/metabolismo , Glicoproteínas de Membrana Plaquetaria/antagonistas & inhibidores , Glicoproteínas de Membrana Plaquetaria/deficiencia , Receptores Acoplados a Proteínas G/antagonistas & inhibidores , Receptores Acoplados a Proteínas G/deficiencia , Índice de Severidad de la Enfermedad , Animales , Encéfalo/patología , Encéfalo/virología , Dihidropiridinas/farmacología , Dihidropiridinas/uso terapéutico , Herpes Simple/patología , Herpes Simple/prevención & control , Imidazoles/farmacología , Imidazoles/uso terapéutico , Masculino , Meningoencefalitis/patología , Meningoencefalitis/prevención & control , Ratones , Ratones Endogámicos C57BL , Ratones Noqueados
15.
Brain Res Bull ; 127: 164-170, 2016 10.
Artículo en Inglés | MEDLINE | ID: mdl-27646480

RESUMEN

The most severe manifestation of Herpes Simplex Type 1 virus (HSV-1) infection is encephalitis characterized by arousal impairment and seizures that can evolve to coma and death. Previous studies reported the involvement of suppressor of cytokine signaling (SOCS) proteins, specifically SOCS1 and SOCS3, in HSV-1 infection, suggesting that other members of this family could be involved in the immune response against HSV-1. No previous study has reported the role of SOCS2 in HSV-1 infection. In the current study, C57BL/6 wild-type mice (WT) and mice deficient in SOCS2 gene (SOCS2-/-) were subjected to intracranial inoculation with 102 plaque forming units (PFU) of HSV-1. Survival curve, neuroinflammatory parameters and neuropathology were evaluated. Infected SOCS2-/- mice had increased survival in comparison with infected WT animals. This better outcome was associated with reduced leukocyte infiltration, concentration of cytokines, and structural changes in the brain. SOCS2 seems to play a detrimental role in HSV-1 encephalitis. Moreover, the control of neuroinflammatory response in HSV-1 infection was of paramount importance to clinical outcome.


Asunto(s)
Encefalitis por Herpes Simple/inmunología , Herpes Simple/inmunología , Herpesvirus Humano 1 , Proteínas Supresoras de la Señalización de Citocinas/deficiencia , Animales , Encéfalo/inmunología , Encéfalo/patología , Quimiocinas/metabolismo , Chlorocebus aethiops , Citocinas/metabolismo , Modelos Animales de Enfermedad , Encefalitis por Herpes Simple/patología , Herpes Simple/patología , Leucocitos/inmunología , Leucocitos/patología , Masculino , Ratones Endogámicos C57BL , Ratones Noqueados , Proteínas Supresoras de la Señalización de Citocinas/genética , Análisis de Supervivencia , Células Vero , Carga Viral
16.
PLoS One ; 10(3): e0119633, 2015.
Artículo en Inglés | MEDLINE | ID: mdl-25775137

RESUMEN

Experimental cerebral malaria (ECM) is characterized by a strong immune response, with leukocyte recruitment, blood-brain barrier breakdown and hemorrhage in the central nervous system. Phosphatidylinositol 3-kinase γ (PI3Kγ) is central in signaling diverse cellular functions. Using PI3Kγ-deficient mice (PI3Kγ-/-) and a specific PI3Kγ inhibitor, we investigated the relevance of PI3Kγ for the outcome and the neuroinflammatory process triggered by Plasmodium berghei ANKA (PbA) infection. Infected PI3Kγ-/- mice had greater survival despite similar parasitemia levels in comparison with infected wild type mice. Histopathological analysis demonstrated reduced hemorrhage, leukocyte accumulation and vascular obstruction in the brain of infected PI3Kγ-/- mice. PI3Kγ deficiency also presented lower microglial activation (Iba-1+ reactive microglia) and T cell cytotoxicity (Granzyme B expression) in the brain. Additionally, on day 6 post-infection, CD3+CD8+ T cells were significantly reduced in the brain of infected PI3Kγ-/- mice when compared to infected wild type mice. Furthermore, expression of CD44 in CD8+ T cell population in the brain tissue and levels of phospho-IkB-α in the whole brain were also markedly lower in infected PI3Kγ-/- mice when compared with infected wild type mice. Finally, AS605240, a specific PI3Kγ inhibitor, significantly delayed lethality in infected wild type mice. In brief, our results indicate a pivotal role for PI3Kγ in the pathogenesis of ECM.


Asunto(s)
Fosfatidilinositol 3-Quinasa Clase Ib/genética , Fosfatidilinositol 3-Quinasa Clase Ib/metabolismo , Malaria Cerebral/inmunología , Malaria Cerebral/patología , Plasmodium berghei/inmunología , Animales , Encéfalo/inmunología , Modelos Animales de Enfermedad , Matriz Extracelular/inmunología , Matriz Extracelular/parasitología , Femenino , Humanos , Pulmón/enzimología , Pulmón/parasitología , Malaria Cerebral/enzimología , Malaria Cerebral/parasitología , Ratones , Inhibidores de las Quinasa Fosfoinosítidos-3 , Quinoxalinas/farmacología , Análisis de Supervivencia , Tiazolidinedionas/farmacología
17.
J Neuroimmunol ; 278: 69-72, 2015 Jan 15.
Artículo en Inglés | MEDLINE | ID: mdl-25595254

RESUMEN

The pathogenesis of autism spectrum disorder (ASD) is unknown, and the immune system has been appointed to play an important role. The interleukin 33 (IL-33), a member of the IL-1, may act as an alarmin. This study aimed to evaluate plasma levels of IL-33, sST2, and IL-1ß in 30 patients with ASD in comparison with 18 controls matched by gender, age and maternal age at childbirth. Patients did not differ from controls in IL-33, sST2, and IL-1ß plasma levels. Alarmin levels were not correlated with age, and neither was influenced by clinical parameters. Our results undermine the role of IL-33/ST2 in ASD.


Asunto(s)
Trastornos Generalizados del Desarrollo Infantil/sangre , Interleucinas/sangre , Adolescente , Estudios de Casos y Controles , Niño , Trastornos Generalizados del Desarrollo Infantil/complicaciones , Femenino , Humanos , Proteína 1 Similar al Receptor de Interleucina-1 , Interleucina-1beta/sangre , Interleucina-33 , Masculino , Escalas de Valoración Psiquiátrica , Receptores de Superficie Celular/sangre , Estadísticas no Paramétricas
18.
Curr Neurovasc Res ; 11(3): 210-22, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-24845856

RESUMEN

Pneumococcal meningitis is associated with neurologic sequelae, such as learning and memory impairment. Most recently, a nonbacteriolytic antibiotic has been investigated to minimise the inflammatory host response and prevent cognitive damage. In this study, we compared daptomycin (DPTO) or ceftriaxone (CFX) treatment on the inflammatory parameters and on the blood-brain barrier (BBB) integrity in experimental pneumococcal meningitis. In the first experiment, the animals received 10 µl of a Streptococcus pneumoniae suspension or artificial cerebrospinal fluid by intracerebroventricular (i.c.v.) and were treated with CFX or DPTO at 18 h post-infection. The animals were euthanised at 18, 20, 24, 36 and 40 h post-infection. In the hippocampus, brain-derived neurotrophic factor (BDNF), tumour necrosis factor alpha (TNF-α), interleukin-6 (IL-6) and IL-10 levels were not different between treatment groups; however, IL-4 and cytokine-induced neutrophil chemoattractant 1 (CINC-1) levels decreased in the CFX group. In the frontal cortex, TNF-α, IL- 4, IL-6, IL-10 and BDNF levels were not different between treatment groups. Only CINC-1 levels decreased at 40 h postinfection with CFX treatment. In the second experiment, the animals received DPTO or CFX for 7 days and were euthanised 10 days after pneumococcal meningitis induction. TNF-α, IL-6, IL-10, CINC-1 and BDNF levels were not different between treatment groups in the hippocampus; however, IL-4 levels decreased in CFX group. In the third experiment, the animals received 10 µl of an S. pneumoniae suspension or artificial CSF by i.c.v. and were treated with a single dose of CFX or DTPO antibiotic; assessment of the BBB breakdown showed that both antibiotics prevented the BBB disruption. Both treatments equally protected the BBB integrity, and there were no significant difference in cytokine production.


Asunto(s)
Antibacterianos/uso terapéutico , Barrera Hematoencefálica/efectos de los fármacos , Ceftriaxona/uso terapéutico , Citocinas/metabolismo , Daptomicina/uso terapéutico , Meningitis Neumocócica/tratamiento farmacológico , Meningitis Neumocócica/patología , Animales , Factor Neurotrófico Derivado del Encéfalo/metabolismo , Modelos Animales de Enfermedad , Relación Dosis-Respuesta a Droga , Hipocampo/efectos de los fármacos , Hipocampo/metabolismo , Masculino , Ratas , Ratas Wistar , Streptococcus pneumoniae/patogenicidad , Factores de Tiempo
19.
Clinics (Sao Paulo) ; 68(3): 391-4, 2013.
Artículo en Inglés | MEDLINE | ID: mdl-23644861

RESUMEN

OBJECTIVE: Ischemic stroke may result from transient or permanent reductions of regional cerebral blood flow. Polymorphonuclear neutrophils have been described as the earliest inflammatory cells to arrive in ischemic tissue. CXCR1/2 receptors are involved in the recruitment of these cells. However, the contribution of these chemokine receptors during transient brain ischemia in mice remains poorly understood. In this work, we investigated the effects of reparixin, an allosteric antagonist of CXCR1/2 receptors, in a model of middle cerebral artery occlusion and reperfusion in mice. METHODS: C57BL/6J male mice treated with reparixin or vehicle were subjected to a middle cerebral artery occlusion procedure 1 h after the treatment. Ninety minutes after ischemia induction, the monofilament that prevented blood flow was removed. Twenty-four hours after the reperfusion procedure, behavioral changes, including motor signs, were analyzed with the SmithKline/Harwell/lmperial College/Royal Hospital/Phenotype Assessment (SHIRPA) battery. The animals were sacrificed, and brain tissue was removed for histological and biochemical analyses. Histological sections were stained with hematoxylin and eosin, neutrophil infiltration was estimated by myeloperoxidase activity and the inflammatory cytokine IL-iß was measured by ELISA. RESULTS: Pre-treatment with reparixin reduced the motor deficits observed in this model of ischemia and reperfusion. Myeloperoxidase activity and IL-iß were reduced in the reparixin-treated group. Histological analysis revealed that ischemic injury was also attenuated by reparixin pre-treatment. CONCLUSIONS: Our results suggest that the blockade of the CXCR1/2 receptors by reparixin promotes neuroprotective effects by reducing the levels of polymorphonuclear infiltration in the brain and the tissue damage associated with middle cerebral artery occlusion and reperfusion.


Asunto(s)
Lesiones Encefálicas/prevención & control , Isquemia Encefálica/tratamiento farmacológico , Fármacos Neuroprotectores/uso terapéutico , Receptores de Interleucina-8A/antagonistas & inhibidores , Receptores de Interleucina-8B/antagonistas & inhibidores , Accidente Cerebrovascular/tratamiento farmacológico , Sulfonamidas/uso terapéutico , Animales , Lesiones Encefálicas/tratamiento farmacológico , Ensayo de Inmunoadsorción Enzimática , Masculino , Ratones , Ratones Endogámicos C57BL , Fármacos Neuroprotectores/farmacología , Peroxidasa/metabolismo , Reproducibilidad de los Resultados , Sulfonamidas/farmacología , Factores de Tiempo , Resultado del Tratamiento
20.
Behav Brain Res ; 230(1): 237-42, 2012 Apr 21.
Artículo en Inglés | MEDLINE | ID: mdl-22366269

RESUMEN

Dengue virus is a human pathogen that may cause meningoencephalitis and other neurological syndromes. The current study investigated anxiety-like behavior and expression of proinflammatory cytokines and pro-apoptotic caspase-3 in the hippocampus of C57BL/6 mice infected with non-adapted Dengue virus 3 genotype I (DENV-3) inoculated intracranially with 4×10(3) (plaque-forming unit) PFU. Anxiety-like behavior was assessed in control and DENV-3 infected mice using the elevated plus maze. The open field test was performed to evaluate locomotor activity. Histopathological changes in CA regions of the hippocampus were assessed by haematoxylin and eosin staining. Immunoreactive and protein levels of cleaved caspase-3 were also analyzed in the hippocampus. The mRNA expression of IL-6 and TNF-α in the hippocampus were estimated by quantitative real time (polymerase chain reaction) PCR. All procedures were conducted on day 5 post-infection. We found that DENV-3 infected mice presented higher levels of anxiety in comparison with controls (p≤0.05). No difference in motor activity was found between groups (p=0.77). The infection was followed by a significant increase of TNF-α and IL-6 mRNA expression in the hippocampus (p≤0.05). Histological analysis demonstrated meningoencephalitis with formation of perivascular cuffs, infiltration of immune cells and loss of neurons at CA regions of hippocampus. Numerous caspase-3 positive neurons were visualized at CA areas in DENV-3 infected mice. Marked increase of cleaved caspase-3 levels were observed after infection. This study described anxiety-like behavior, hippocampal inflammation and neuronal apoptosis associated with DENV-3 infection in the central nervous system.


Asunto(s)
Trastornos de Ansiedad/etiología , Trastornos de Ansiedad/virología , Dengue/complicaciones , Encefalitis/complicaciones , Encefalitis/etiología , Animales , Apoptosis/fisiología , Virus del Dengue/genética , Virus del Dengue/patogenicidad , Virus del Dengue/fisiología , Modelos Animales de Enfermedad , Encefalitis/patología , Conducta Exploratoria/fisiología , Hipocampo/metabolismo , Hipocampo/virología , Interleucina-6/genética , Interleucina-6/metabolismo , Masculino , Aprendizaje por Laberinto/fisiología , Ratones , Ratones Endogámicos C57BL , ARN Mensajero/metabolismo , Factor de Necrosis Tumoral alfa/genética , Factor de Necrosis Tumoral alfa/metabolismo , Proteínas Virales/genética , Proteínas Virales/metabolismo
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