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Guanosine Protects Against Cortical Focal Ischemia. Involvement of Inflammatory Response. | LitMetric

Guanosine Protects Against Cortical Focal Ischemia. Involvement of Inflammatory Response.

Mol Neurobiol

Department of Biochemistry, Postgraduate Program in Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul (UFRGS), Ramiro Barcelos, 2600 - Anexo, Santa Cecília, 90035-003, Porto Alegre, RS, Brazil.

Published: December 2015

AI Article Synopsis

Article Abstract

Stroke is the major cause of death and the most frequent cause of disability in the adult population worldwide. Guanosine plays an important neuroprotective role in several cerebral ischemic models and is involved in the modulation of oxidative responses and glutamatergic parameters. Because the excessive reactive oxygen species produced during an ischemic event can trigger an inflammatory response, the purpose of this study was to evaluate the hypothesis that guanosine is neuroprotective against focal cerebral ischemia, inhibits microglia/macrophages activation, and mediates an inflammatory response ameliorating the neural damage. Permanent focal cerebral ischemia was induced in adult rats, and guanosine was administered immediately, 1, 3, and 6 h after surgery. Twenty-four hours after ischemia, the asymmetry scores were evaluated by the cylinder test; neuronal damage was evaluated by Fluoro-Jade C (FJC) staining and propidium iodide (PI) incorporation; microglia and immune cells were evaluated by anti-Iba-1 antibody; and inflammatory parameters such as interleukins (IL): IL-1, IL-6, IL-10; tumor necrosis factors alpha (TNF-α); and interferon-gamma (INF-γ) were evaluated in the brain tissue and cerebrospinal fluid. The ischemic event increased the levels of Iba-1-positive cells and pro-inflammatory cytokines and decreased IL-10 levels (an anti-inflammatory cytokine) in the lesion periphery. The guanosine treatment attenuated the changes in these inflammatory parameters and also reduced the infarct volume, PI incorporation, and number of FJC-positive cells, improving the functional recovery. Thus, guanosine may have been a promising therapeutic agent for the treatment of ischemic brain injury by reduction of inflammatory process triggered in an ischemic event.

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Source
http://dx.doi.org/10.1007/s12035-014-8978-0DOI Listing

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