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Abstract
Synucleins, including α-synuclein (α-syn), β-syn, and γ-syn, have been implicated in various synucleinopathies, notably Parkinson’s disease (PD), which has generated increased interest in understanding their roles. Although α-syn and β-syn have contrasting neuropathological consequences, the precise role of γ-syn remains unclear. This study validated non-motor symptoms, specifically anxiety-like behavior, along with the degradation of dopaminergic (DAergic) neurons in the nigrostriatal system and DAergic neurites in the prefrontal cortex and hippocampus of rats infused with striatal 6-hydroxydopamine (6-OHDA). Our study further investigated the alterations in γ-syn expression levels in the prefrontal cortices and hippocampi of these 6-OHDA–treated rats, aiming to establish foundational insights into the neuropathophysiology of DA depletion, a central feature of PD. Our findings revealed a significant increase in the expression of γ-syn mRNA and protein in these brain regions, in contrast to unaltered α- and β-syn expression levels. This suggests a distinct role of γ-syn within the neurobiological milieu under conditions of DA deficiency. Overall, our data shed light on the neurobiological changes observed in the hemiparkinsonian rat model induced with 6-OHDA, underscoring the potential significance of γ-syn in PD pathology.
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