Journal
EXPERIMENTAL NEUROLOGY
Volume 300, Issue -, Pages 188-200Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.expneurol.2017.11.009
Keywords
Parkinson's disease; Forced swim test; 6-Hydroxydopamine; Pioglitazone; Neurogenesis
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Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), Brazil
- Universidade Estadual de Maringa, Brazil
- Universidade Federal do Parana, Brazil
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Deficiencies in adult hippocampal neurogenesis have been suggested to be a possible pathophysiological mechanism that underlies depressive symptoms that are often observed in patients with Parkinson's disease (PD). Pioglitazone, a selective peroxisome proliferator-activated receptor gamma (PPAR-gamma) agonist, has been shown to exert antiinflammatory and antidepressant effects and modulate neural plasticity in several neurodegenerative disorders. The present study investigated the effects of pioglitazone on depressive phenotypes and adult hippocampal neurogenesis in a rat model of PD that was induced by bilateral 6-hydroxydopamine (6-0HDA) infusions in the substantia nigra pars compact (SNpc). Rats with SNpc and ventral tegmental area (VTA) neurodegeneration exhibited despair-like behavior, concomitant with persistent microglial activation in the hippocampus. Pioglitazone reduced the rate of mortality and attenuated microglial activation in the early phase of 6-OHDA-induced nigral lesions. Pioglitazone exerted antidepressant-like effects and increased the survival of neurons in the hippocampus in rats with nigral lesions. These results indicate that pioglitazone exerts neuroprotective effects by facilitating hippocampal neurogenesis in 6-OHDA-lesioned rats, which might contribute to its antidepressant-like effect.
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