Astrocyte-derived GDNF is a potent inhibitor of microglial activation

Neurobiology of Disease
Sandra Moreira RochaGraça Baltazar

Abstract

Neuroinflammation is recognized as a major factor in Parkinson's disease (PD) pathogenesis and increasing evidence propose that microglia is the main source of inflammation contributing to the dopaminergic degeneration observed in PD. Several studies suggest that astrocytes could act as physiological regulators preventing excessive microglia responses. However, little is known regarding how astrocytes modulate microglial activation. In the present study, using Zymosan A-stimulated midbrain microglia cultures, we showed that astrocytes secrete factors capable of modulating microglial activation, namely its phagocytic activity and the production of reactive oxygen species since both parameters were highly diminished in cells incubated with astrocytes conditioned media (ACM). Glial cell line-derived neurotrophic factor (GDNF), cerebral dopamine neurotrophic factor (CDNF) and brain-derived neurotrophic factor (BDNF), known to have a neuroprotective role in the nigrostriatal system, are among the candidates to be astrocyte-secreted molecules involved in the modulation of microglial activation. The effect of ACM on Zymosan A-induced microglial activation was abolished when the GDNF present in the ACM was abrogated using a specific an...Continue Reading

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