Involvement Of Ampk, Ik Beta Alpha-nf Kappa B And Enos In The Sildenafil Anti-inflammatory Mechanism In A Demyelination Model

dc.creatorSantana Nunes
dc.creatorAna Karolina; Raposo
dc.creatorCatarina; Santos Rocha
dc.creatorSura Wanessa; de Sousa Barbosa
dc.creatorKarla Patricia; de Almeida Luna
dc.creatorRayana Leal; da Cruz-Hoefling
dc.creatorMaria Alice; Peixoto
dc.creatorChristina Alves
dc.date2015-Nov
dc.date2016-06-07T13:19:10Z
dc.date2016-06-07T13:19:10Z
dc.date.accessioned2018-03-29T01:39:23Z
dc.date.available2018-03-29T01:39:23Z
dc.identifier
dc.identifierInvolvement Of Ampk, Ik Beta Alpha-nf Kappa B And Enos In The Sildenafil Anti-inflammatory Mechanism In A Demyelination Model. Elsevier Science Bv, v. 1627, p. 119-133 Nov-2015.
dc.identifier0006-8993
dc.identifierWOS:000366228400012
dc.identifier10.1016/j.brainres.2015.09.008
dc.identifierhttp://www.sciencedirect.com/science/article/pii/S0006899315007064
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/242640
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1306338
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionSildenafil (Viagra (R)) has recently been found to have a neuroprotective effect, which occurs through the inhibition of inflammation and demyelination in the cerebellum. However, the mechanism of action of sildenafil remains unknown. AMPK, the regulatory protein of the lipid and glucose metabolism, plays a protective role by activating the eNOS enzyme. The production of a nanomolar concentration of NO by eNOS has an anti-inflammatory effect through the cGMP signaling pathway and plays an important role in the regulation of the nuclear transcription factor (NFkB), preventing the expression of inflammatory genes. The present study investigated whether AMPK-eNOS-NO-cGMP-I kappa beta alpha-NFkB is involved in the mechanism of action of sildenafil in a cuprizone-demyelination model. Neuroinflammation and demyelination induced by cuprizone in rodents have been widely used as a model of MS. In the present study, five male C57BL/6 mice (7-10 weeks old) were used. Over a four week period, the groups received: cuprizone (CPZ) 0.2% mixed in feed; CPZ in the diet, combined with the administration of sildenafil (Viagra (R), Pfizer, 25 mg/kg) orally in drinking water, starting concurrently (sild-T0) or 15 days (sild-T15) after the start of CPZ. Control animals received pure food and water. The cerebella of the mice were dissected and processed for immunohistochemistry, immunofluorescence (frozen), western blotting and dosage of cytokines (Elisa). CPZ induced an increase in the expression of GFAP, IL-1 beta TNF-alpha, total NFkB and inactive AMPK, and prompt microglia activation. CPZ also induced a reduction of IK beta alpha. The administration of sildenafil reduced the expression of the proinflammatory cytokines IL-1 beta and TNF-alpha and increased the expression of the anti-inflammatory cytokine IL-10. In addition, the administration of sildenafil reduced expression of GFAP, NFkB, inactive AMPK and iNOS, and increased IK beta alpha. Interestingly, sildenafil also reduced levels of NGF. In general, the sild-T0 group was more effective than sild-T15 in improving clinical status and promoting the control of neuroinflammation. The present study offers evidence that sildenafil has anti-inflammatory and neuroprotective effects, which are probably achieved through modulation of AMPK-IK beta alpha-NF kappa B signaling. In addition, eNOS may play a role in the sildenafil neuroprotective mechanism, contributing to the activation of AMPK. However, other pathways such as MAPK-NFkB and the downstream proteins AMPK (AMPK-SIRT1-NF kappa B) should also be further investigated. An understanding of these mechanisms of action is critical for the clinical use of sildenafil to control neuroinflammation in neurodegenerative diseases such as MS. (C) 2015 Elsevier B.V. All rights reserved.
dc.description1627
dc.description
dc.description
dc.description119
dc.description133
dc.descriptionFACEPE [AMD-0094-2.00/1]
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionINBEB
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionFAPESP [2011/08005-6]
dc.description
dc.description
dc.description
dc.languageen
dc.publisherELSEVIER SCIENCE BV
dc.publisher
dc.publisherAMSTERDAM
dc.relationBRAIN RESEARCH
dc.rightsembargo
dc.sourceWOS
dc.subjectActivated Protein-kinase
dc.subjectExperimental Autoimmune Encephalomyelitis
dc.subjectCentral-nervous-system
dc.subjectMultiple-sclerosis
dc.subjectNitric-oxide
dc.subjectFunctional Recovery
dc.subjectEpithelial-cells
dc.subjectGrowth-factor
dc.subjectIn-vitro
dc.subjectInflammation
dc.titleInvolvement Of Ampk, Ik Beta Alpha-nf Kappa B And Enos In The Sildenafil Anti-inflammatory Mechanism In A Demyelination Model
dc.typeArtículos de revistas


Este ítem pertenece a la siguiente institución