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Compensatory mechanisms in dopamine (DA) signaling have long been proposed to delay onset of locomotor symptoms during Parkinson's disease progression until ~ 80% loss of striatal DA occurs. Increased striatal dopamine turnover has been proposed to be a part of this compensatory response, but may occur after locomotor symptoms. Increased tyrosine hydroxylase (TH) activity has also been proposed as...
J. Neurochem. (2010) 115, 707–715.
AbstractWe recently reported that age‐related bradykinesia was associated with reduced dopamine (DA) tissue content, ser31 tyrosine hydroxylase (TH) phosphorylation, and total TH levels in substantia nigra (SN) only. In this study, we propose that these decreases result from reduced glial cell line‐derived neurotrophic factor family receptor α‐1 (GFR α‐1) levels...
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