Genetic inactivation of the adenosine A(2A) receptor exacerbates brain damage in mice with experimental autoimmune encephalomyelitis |
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Authors: | Yao Shu-Qin Li Zheng-Zheng Huang Qing-Yuan Li Fang Wang Zhao-Wei Augusto Elisabete He Jin-Cai Wang Xiao-Tong Chen Jiang-Fan Zheng Rong-Yuan |
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Affiliation: | Department of Neurology, the First Affiliated Hospital and Research Institute of Experimental Neurobiology, Wenzhou Medical College, Wenzhou, Zhejiang, P.R. China Department of Neurology, Boston University School of Medicine, Boston, USA. |
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Abstract: | 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. |
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Keywords: | adenosine A1 receptors adenosine A2A receptors CD4+ T cells experimental autoimmune encephalomyelitis (EAE) microglial cells multiple sclerosis. |
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