Journal
JOURNAL OF NEUROPATHOLOGY AND EXPERIMENTAL NEUROLOGY
Volume 66, Issue 10, Pages 923-931Publisher
OXFORD UNIV PRESS INC
DOI: 10.1097/nen.0b013e3181567c31
Keywords
lymphocytes; microglia; multiple sclerosis; neuroinflammation; PDE4; PDE7
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Experimental autoimmune encephalomyelitis (EAE) in Lewis rats is the most widely used animal model for multiple sclerosis. Cyclic adenosine monophosphate (cAMP) has been associated with neuroinflammation. The aim of this study was to investigate the possible involvement of different cAMP-specific phosphodiesterase (PDE) isoenzymes by analyzing their expression in the brain of EAE rats. We found in the brain of EAE animals that there was a dramatic increase in the mRNA expression levels of the PDE4B isozyme detected around blood vessels from the spinal cord to the upper midbrain. There was a single splicing form of the 4 splice variants that are known for PDE4B: PDE4B2, which showed increased expression levels. This overexpression is localized around the blood vessels and parenchyma in infiltrating T cells and macrophages/microglia. These results support the role played by the activation of the PDE4B2 gene in the neuroinflammatory process in EAE rats.
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