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Impairment of Adenosinergic System in Rett syndrome: Novel Therapeutic Target to Boost BDNF Signalling

2020Journal article Open access
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dc.contributor.authorMiranda-Lourenço, C
dc.contributor.authorDuarte, ST
dc.contributor.authorPalminha, C
dc.contributor.authorGaspar, C
dc.contributor.authorRodrigues, TM
dc.contributor.authorMagalhães-Cardoso, T
dc.contributor.authorRei, N
dc.contributor.authorColino-Oliveira, M
dc.contributor.authorGomes, R
dc.contributor.authorFerreira, S
dc.contributor.authorRosa, J
dc.contributor.authorXapelli, S
dc.contributor.authorArmstrong, J
dc.contributor.authorGarcía-Cazorla, A
dc.contributor.authorCorreia-de-Sá, P
dc.contributor.authorSebastião, AM
dc.contributor.authorDiógenes, MJ
dc.date.accessioned2021-05-27T07:57:43Z
dc.date.available2021-05-27T07:57:43Z
dc.date.issued2020
dc.description.abstractRett syndrome (RTT; OMIM#312750) is mainly caused by mutations in the X-linked MECP2 gene (methyl-CpG-binding protein 2 gene; OMIM*300005), which leads to impairments in the brain-derived neurotrophic factor (BDNF) signalling. The boost of BDNF mediated effects would be a significant breakthrough but it has been hampered by the difficulty to administer BDNF to the central nervous system. Adenosine, an endogenous neuromodulator, may accomplish that role since through A2AR it potentiates BDNF synaptic actions in healthy animals. We thus characterized several hallmarks of the adenosinergic and BDNF signalling in RTT and explored whether A2AR activation could boost BDNF actions. For this study, the RTT animal model, the Mecp2 knockout (Mecp2-/y) (B6.129P2 (C)-Mecp2tm1.1Bird/J) mouse was used. Whenever possible, parallel data was also obtained from post-mortem brain samples from one RTT patient. Ex vivo extracellular recordings of field excitatory post-synaptic potentials in CA1 hippocampal area were performed to evaluate synaptic transmission and long-term potentiation (LTP). RT-PCR was used to assess mRNA levels and Western Blot or radioligand binding assays were performed to evaluate protein levels. Changes in cortical and hippocampal adenosine content were assessed by liquid chromatography with diode array detection (LC/DAD). Hippocampal ex vivo experiments revealed that the facilitatory actions of BDNF upon LTP is absent in Mecp2-/y mice and that TrkB full-length (TrkB-FL) receptor levels are significantly decreased. Extracts of the hippocampus and cortex of Mecp2-/y mice revealed less adenosine amount as well as less A2AR protein levels when compared to WT littermates, which may partially explain the deficits in adenosinergic tonus in these animals. Remarkably, the lack of BDNF effect on hippocampal LTP in Mecp2-/y mice was overcome by selective activation of A2AR with CGS21680. Overall, in Mecp2-/y mice there is an impairment on adenosinergic system and BDNF signalling. These findings set the stage for adenosine-based pharmacological therapeutic strategies for RTT, highlighting A2AR as a therapeutic target in this devastating pathology.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationNeurobiol Dis . 2020 Nov;145:105043pt_PT
dc.identifier.doi10.1016/j.nbd.2020.105043pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.17/3705
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.subjectAdenosinergic Systempt_PT
dc.subjectBrain-derived Neurotrophic Factorpt_PT
dc.subjectMecp2 Knockout Modelpt_PT
dc.subjectRett Syndromept_PT
dc.subjectHDE NEU PEDpt_PT
dc.titleImpairment of Adenosinergic System in Rett syndrome: Novel Therapeutic Target to Boost BDNF Signallingpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage105043pt_PT
oaire.citation.titleNeurobiology of diseasept_PT
oaire.citation.volume145pt_PT
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT

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