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The Journal of Neuroscience, November 12, 2008, 28(46):11980-11988; doi:10.1523/JNEUROSCI.2920-08.2008

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Cellular/Molecular
G-Protein-Coupled Receptor Screen Reveals a Role for Chemokine Receptor CCR5 in Suppressing Microglial Neurotoxicity

Kazushige Gamo,¹ Sumiko Kiryu-Seo,¹ Hiroyuki Konishi,¹ Shunsuke Aoki,² Kouji Matsushima,³ Keiji Wada,² and Hiroshi Kiyama¹

¹Department of Anatomy and Neurobiology, Osaka City University, Graduate School of Medicine, Abeno-ku, Osaka 545-8585, Japan, ²Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo 187-8502, Japan, and ³Department of Molecular Preventive Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan

Correspondence should be addressed to Dr. Hiroshi Kiyama, Department of Anatomy and Neurobiology, Osaka City University, Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan. Email: kiyama{at}med.osaka-cu.ac.jp

G-protein-coupled receptors (GPCRs) form the largest superfamily of membrane proteins, and several GPCRs have been implicated in signaling between neurons and glia to protect neurons from pathological stresses. Here, we have used a screening strategy to investigate GPCRs that are involved in neuronal protection. The real-time PCR was performed using 274 primers targeting nonsensory GPCR mRNAs, which were listed on the database. The cDNAs from control and nerve-injured hypoglossal nuclei of mouse brain were used, and the alterations of PCR products were compared. This screen and the subsequent in situ hybridization screen exhibited six GPCR mRNAs which were prominently and convincingly induced in nerve-injured hypoglossal nuclei. Among these candidates, the chemokine receptor CCR5 was selected, based on the marked induction in CCR5 mRNA in microglia after nerve injury. The mRNA expression of ligands for CCR5, such as regulated on activation normal T-cell expressed and secreted (RANTES/CCL5), MIP-1, and MIP-1β, were induced in injured motor neurons, indicating that CCR5 and its ligands were expressed in microglia and neurons, respectively, in response to nerve injury. In vitro, lipopolysaccharide (LPS)-induced expression of mRNAs for inflammatory cytokines (IL-1β, IL-6, and tumor necrosis factor-) and inducible nitric oxide synthase (iNOS) in microglia were all suppressed by RANTES. Those suppressions were not observed in microglia from CCR5 null mice. In addition, nerve injury-induced motor neuron death seen in wild type C56BL/6J mice was accelerated in CCR5 knock-out C57BL/6J. These results may suggest that CCR5-mediated neuron–glia signaling functions to protect neurons by suppressing microglia toxicity.

Key words: GPCR; chemokine; microglia; regeneration; neuroprotection; axotomy

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Received June 24, 2008; revised Sept. 30, 2008; accepted Oct. 1, 2008.

Correspondence should be addressed to Dr. Hiroshi Kiyama, Department of Anatomy and Neurobiology, Osaka City University, Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan. Email: kiyama{at}med.osaka-cu.ac.jp

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