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Genetic inactivation of the adenosine A 2A receptor exacerbates brain damage in mice with experimental autoimmune encephalomyelitis
Author(s) -
Yao ShuQin,
Li ZhengZheng,
Huang QingYuan,
Li Fang,
Wang ZhaoWei,
Augusto Elisabete,
He JinCai,
Wang XiaoTong,
Chen JiangFan,
Zheng RongYuan
Publication year - 2012
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1111/j.1471-4159.2012.07807.x
Subject(s) - experimental autoimmune encephalomyelitis , adenosine a2a receptor , neuroinflammation , myelin oligodendrocyte glycoprotein , adenosine , multiple sclerosis , neuroprotection , receptor , knockout mouse , adenosine receptor , encephalomyelitis , brainstem , gliosis , microglia , myelin , immunology , biology , neuroscience , endocrinology , medicine , central nervous system , inflammation , agonist
Studies with multiple sclerosis patients and animal models of experimental autoimmune encephalomyelitis (EAE) implicate adenosine and adenosine receptors in modulation of neuroinflammation and brain injury. Although the involvement of the A 1 receptor has been recently demonstrated, the role of the adenosine A 2A receptor (A 2A R) in development of EAE pathology is largely unknown. Using mice with genetic inactivation of the A 2A receptor, we provide direct evidence that loss of the A 2A R exacerbates EAE pathology in mice. Compared with wild‐type mice, A 2A R knockout mice injected with myelin oligodendroglia glycoprotein peptide had a higher incidence of EAE and exhibited higher neurological deficit scores and greater decrease in body weight. A 2A R knockout mice displayed increased inflammatory cell infiltration and enhanced microglial cell activation in cortex, brainstem, and spinal cord. In addition, demyelination and axonal damage in brainstem were exacerbated, levels of Th1 cytokines increased, and Th2 cytokines decreased. Collectively, these findings suggest that extracellular adenosine acting at A 2A Rs triggers an important neuroprotective mechanism. Thus, the A 2A receptor is a potential target for therapeutic approaches to multiple sclerosis.