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Purinergic Signal ; 17(2): 255-271, 2021 06.
Artigo em Inglês | MEDLINE | ID: mdl-33834349

RESUMO

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 administration as a potential new treatment for brain ischemia with a more suitable therapeutic window.


Assuntos
Encéfalo/fisiopatologia , Guanosina/administração & dosagem , Guanosina/uso terapêutico , AVC Isquêmico/tratamento farmacológico , AVC Isquêmico/fisiopatologia , Fármacos Neuroprotetores/administração & dosagem , Fármacos Neuroprotetores/uso terapêutico , Administração Intranasal , Animais , Barreira Hematoencefálica/efeitos dos fármacos , Morte Celular/efeitos dos fármacos , Veias Cerebrais/efeitos dos fármacos , Eletrocoagulação , Eletroencefalografia/efeitos dos fármacos , Lateralidade Funcional/efeitos dos fármacos , AVC Isquêmico/complicações , Masculino , Transtornos dos Movimentos/etiologia , Transtornos dos Movimentos/prevenção & controle , Ratos , Ratos Wistar , Transdução de Sinais/efeitos dos fármacos
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