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CX3CL1 Is Neuroprotective in Permanent Focal Cerebral Ischemia in Rodents

Cipriani, Raffaela, Villa, Pia, Chece, Giuseppina, Lauro, Clotilde, Paladini, Alessandra, Micotti, Edoardo, Perego, Carlo, De Simoni, Maria-Grazia, Fredholm, Bertil B., Eusebi, Fabrizio, Limatola, Cristina·2011·The Journal of Neuroscience
DOI 10.1523/jneurosci.3611-11.2011
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Abstract

The chemokine CX3CL1 and its receptor CX3CR1 are constitutively expressed in the nervous system. In this study, we used in vivo murine models of permanent middle cerebral artery occlusion (pMCAO) to investigate the protective potential of CX3CL1. We report that exogenous CX3CL1 reduced ischemia-induced cerebral infarct size, neurological deficits, and caspase-3 activation. CX3CL1-induced neuroprotective effects were long lasting, being observed up to 50 d after pMCAO in rats. The neuroprotective action of CX3CL1 in different models of brain injuries is mediated by its inhibitory activity on microglia and, in vitro , requires the activation of adenosine receptor 1 (A 1 R). We show that, in the presence of the A 1 R antagonist 1,3-dipropyl-8-cyclopentylxanthine and in A 1 R −/− mice, the neuroprotective effect of CX3CL1 on pMCAO was abolished, indicating the critical importance of the adenosine system in CX3CL1 protection also in vivo . In apparent contrast with the above reported data but in agreement with previous findings, cx3cl1 −/− and cx3cr1 GFP/GFP mice, respectively, deficient in CX3CL1 or CX3CR1, had less severe brain injury on pMCAO, and the administration of exogenous CX3CL1 increased brain damage in cx3cl1 −/− ischemic mice. We also report that CX3CL1 induced a different phagocytic activity in wild type and cx3cl1 −/− microglia in vitro during cotreatment with the medium conditioned by neurons damaged by oxygen-glucose deprivation. Together, these data suggest that acute administration of CX3CL1 reduces ischemic damage via an adenosine-dependent mechanism and that the absence of constitutive CX3CL1–CX3CR1 signaling changes the outcome of microglia-mediated effects during CX3CL1 administration to ischemic brain.

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Metadata

Authors
Cipriani, R., Villa, P., Chece, G., Lauro, C., Paladini, A., Micotti, E., Perego, C., De Simoni, M.-G., Fredholm, B. B., Eusebi, F., & Limatola, C.
Venue
The Journal of Neuroscience
Publisher
Society for Neuroscience
Published
2011-11-09
Volume
31
Issue
45
Pages
16327-16335
ISSN
  • 0270-6474
  • 1529-2401
DOI
10.1523/jneurosci.3611-11.2011
Cited by
166
References
11
Language
en
Licence
creativecommons.org/licenses/by-nc-sa/4.0/ (vor, 182 d)

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