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(Artigo : Efeito do transplante de células mononucleares da medula óssea sobre o metabolismo cerebral da glicose in vivo e o comportamento depressivo no modelo experimental de epilepsia crônica induzido por pilocarpina) Temporal lobe epilepsy (TLE) is one of the most common kind of epilepsy syndromes in the world population. Depression is an important comorbidity of epilepsy. It has been reported in patients with TLE and different experimental models of epilepsy. However, there is no established consensus about which brain regions are associated with the manifestation of depression in epilepsy. BMMC transplantation has been used for treatment of epilepsy and has showed a large number of benefit effects in this neuropathology. 18FFDG has been widely used to investigate the cerebral metabolism in patients with TLE or depression disorders, and recently in animal models using microPET imaging. We investigate longitudinally the alterations in cerebral glucose metabolism in rats submitted to the pilocarpine model and observe the effect of BMMC transplantation in cerebral FDG uptake to correlate it to depressive behavior during the chronic phase of epilepsy. Our results demonstrated that pilocarpine-treated rats showed depression-like behavior and reduced 18F-FDG uptake in several brain regions related to the pathophysiology of both epilepsy and depression during chronic phase. Besides, BMMC treatment reduced cognitive dysfunction and depressive-like behavior showed by chronically epileptic rats. However, the BMMC transplantation did not affect the brain glucose metabolism in those animals. Additionally, we found a hypersynchrony metabolic network in the chronically epileptic animals, and reduced connectivity in BMMC-treated animals, similar to Control rats. This study suggests further evidence of depressive behavior as a comorbidity in the pilocarpineinduced epilepsy model, and an important alteration of glucose metabolism and metabolic network among brain regions of interest for both pathologies. Additionally, this study suggested a potential effect of BMMC transplantation for reduction of seizure frequency, cognitive deficits and depressive-like behavior, as well as contribute to normalize the connectivity in the metabolic network in chronically epileptic animals. |
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