2014-10-302014-10-302014-04-14CASTRO, Ketlin Jaquelline Santana de. Efeito combinado do exercício físico e da degradação da matriz extracelular na plasticidade do córtex cerebral após isquemia. 2014. 71 f. Dissertação (Mestrado) – Universidade Federal do Pará, Instituto de Ciências Biológicas, Belém, 2014. Programa de Pós-Graduação em Neurociências e Biologia Celular.https://repositorio.ufpa.br/handle/2011/5944Cerebrovascular diseases are major cause of neurological disability and death in Brazil, and more than 80% of them are caused by ischemic stroke. The survivors subsist with a variety of sensory, cognitive and motor deficits. Therefore, it becomes necessary to develop therapeutic strategies to promote functional recovery in this patients. After ischemia, there is an increase in the inhibitory molecules expression as proteoglycans of chondroitin sulfate (CSPGs) presents in the extracellular matrix of the nervous tissue. The removal of these molecules, as well as physical exercise, have been used as strategy to induce another window of brain plasticity and improve functional recovery. In this work, we running experimental ischemic injury on sensorimotor areas forepaw representation (S1/M1) and tested associations between removal of CSPGs and physical exercise in n=16 Wistar rats (Rattus norvegicus). To delivery drugs to the forepaw representation in the cerebral cortex, we used a biomembrane previously ChABC-saturated or BSA-saturated and all animals had 21 days of survival divided in: Control group or BSA; Exercise group; ChABC group; and ChABC + Exercise group. The lesion area was no different across groups (control: 0,48±0,12; exercise: 0,46±0,05; ChABC: 0,50±0,18; ChABC+exercise: 0,50±0,18; ANOVA and Tukey post-test). Animals that were subjected to CSPGs enzymatic removal showed immunostaining for anti-chondroitin-4-sulphate (C4S) antibody in lesion area at the end of survival, with no evidence of CSPGs degradation in Control and Exercise groups. We evaluated the functional recovery of affected paw running vertical exploration test and ladder rung walking test. The vertical exploration test showed ischemic injury did not cause extensive functional loss, not changing exploratory behavior, or the use frequency of the affected forepaw after injury (Control group: baseline (0,03±0,10), 3d (0,29±0,17), 7d (0,30±0,10), 14d (0,29±0,16) e 21d (0,27±0,13) days after injury; Exercise group: baseline (0,30±0,12), 3d (0,32±0,24), 7d (0,19±0,37), 14d (0,31±0,10) e 21d (0,32±0,09) days after injury; ChABC group: baseline (0,34±0,07), 3d (0,20±0,11), 7d (0,23±0,07), 14d (0,33±0,14) e 21d (0,39±0,16) after injury; ChABC + Exercício group: baseline (0,34±0,04), 3d (0,20±0,09), 7d (0,26±0,04), 14d (0,18±0,08) e 21d (0,27±0,04) after injury (ANOVA and Tukey post-test). The group that only had removing CSPGs presented a better performance on Ladder rung walking test but at the end of the 21-day survival, the control groups and ChABC + Exercise reached a spontaneous recovery (equivalent to pre-injury test) reaching the ChABC group. The group treated with Exercise did not achieve the spontaneous recovery showing a motor performance significantly lower than other groups at all times of reevaluation (baseline: 8,40±0,28; 3d: 4,30±0,48; 7d: 4,75±0,50; 14d 5,35±0,41; 21d: 5,05±0,67; ANOVA and Tukey post-test). We conclude that the removal of CSPGs early improves motor performance in the affected forepaw after stroke on sensoriomotor cortex but associate with specific physical exercise doesn’t improve functional recovery.porAcesso AbertoAcidente vascular cerebralMatriz extracelularExercícios físicosDissertaçãoCNPQ::CIENCIAS BIOLOGICAS::FISIOLOGIA::FISIOLOGIA GERAL::NEUROFISIOLOGIA