Effects of intranasal guanosine administration on brain function in a rat model of ischemic stroke.
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2021
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Ischemic stroke is a major cause of morbidity and mortality worldwide and only few affected patients are able to receive treatment,
especially in developing countries. Detailed pathophysiology of brain ischemia has been extensively studied in order to discover
new treatments with a broad therapeutic window and that are accessible to patients worldwide. The nucleoside guanosine (Guo) has
been shown to have neuroprotective effects in animal models of brain diseases, including ischemic stroke. In a rat model of focal
permanent ischemia, systemic administration of Guo was effective only when administered immediately after stroke induction. In
contrast, intranasal administration of Guo (In-Guo) was effective even when the first administration was 3 h after stroke induction. In
order to validate the neuroprotective effect in this larger time window and to investigate In-Guo neuroprotection under global brain
dysfunction induced by ischemia, we used the model of thermocoagulation of pial vessels in Wistar rats. In our study, we have found
that In-Guo administered 3 h after stroke was capable of preventing ischemia-induced dysfunction, such as bilateral suppression and
synchronicity of brain oscillations and ipsilateral cell death signaling, and increased permeability of the blood-brain barrier. In
addition, In-Guo had a long-lasting effect on preventing ischemia-induced motor impairment. Our data reinforce In-Guo adminis-
tration as a potential new treatment for brain ischemia with a more suitable therapeutic window.
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Cell signaling, Neuroprotection, Quantitative electroencephalogram, Blood-brain barrier
Citação
MÜLLER, G. C. et al. Effects of intranasal guanosine administration on brain function in a rat model of ischemic stroke. Purinergic Signalling, v. 17, p. 255–271, 2021. Disponível em: <https://link.springer.com/article/10.1007/s11302-021-09766-x>. Acesso em: 11 out. 2022.