1. Neuroprotective arylpiperazine dopaminergic/serotonergic ligands suppress experimental autoimmune encephalomyelitis in rats.
- Author
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Popovic, Marjan, Stanojevic, Zeljka, Tosic, Jelena, Isakovic, Aleksandra, Paunovic, Verica, Petricevic, Sasa, Martinovic, Tamara, Ciric, Darko, Kravic‐Stevovic, Tamara, Soskic, Vukic, Kostic‐Rajacic, Sladjana, Shakib, Kaveh, Bumbasirevic, Vladimir, and Trajkovic, Vladimir
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NEUROPROTECTIVE agents , *ENCEPHALOMYELITIS , *PIPERAZINE , *MESSENGER RNA , *TUMOR necrosis factors , *GRANULOCYTE-macrophage colony-stimulating factor - Abstract
Arylpiperazine-based dopaminergic/serotonergic ligands exert neuroprotective activity. We examined the effect of arylpiperazine D2/5- HT1A ligands, N-{4-[2-(4-phenyl-piperazin-1-yl)-ethyl}-phenyl]-picolinamide ( 6a) and N-{3-[2-(4-phenyl-piperazin-1-yl)-ethyl]-phenyl}-picolinamide ( 6b), in experimental autoimmune encephalomyelitis ( EAE), a model of neuroinflammation. Both compounds (10 mg/kg i.p.) reduced EAE clinical signs in spinal cord homogenate-immunized Dark Agouti rats. Compound 6b was more efficient in delaying the disease onset and reducing the maximal clinical score, which correlated with its higher affinity for D2 and 5- HT1A receptors. The protection was retained if treatment was limited to the effector (from day 8 onwards), but not the induction phase (day 0-7) of EAE. Compound 6b reduced CNS immune infiltration and expression of mRNA encoding the proinflammatory cytokines tumor necrosis factor, IL-6, IL-1, and GM- CSF, TH1 cytokine IFN-γ, TH17 cytokine IL-17, as well as the signature transcription factors of TH1 (T-bet) and TH17 ( RORγt) cells. Arylpiperazine treatment reduced apoptosis and increased the activation of anti-apoptotic mediators Akt and p70S6 kinase in the CNS of EAE animals. The in vitro treatment with 6b protected oligodendrocyte cell line OLN-93 and neuronal cell line PC12 from mitogen-activated normal T cells or myelin basic protein-activated encephalitogenic T cells. In conclusion, arylpiperazine dopaminergic/serotonergic ligands suppress EAE through a direct neuroprotective action and decrease in CNS inflammation. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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