Resumen
Striatal neurons convert l-dopa to dopamine (DA) following gene transfer of aromatic l-amino acid decarboxylase (AADC) via adeno-associated virus (AAV) in parkinsonian monkeys. We investigated whether AAV-AADC could reduce or eliminate l-dopa-induced dyskinesias (LIDs) and side effects in MPTP-treated monkeys. Five monkeys were made parkinsonian by bilateral MPTP lesions. The optimal therapeutic dose of l-dopa was determined using an acute dose response regimen. After 3 weeks of chronic l-dopa treatment, AAV-AADC or control vector was bilaterally injected into the striatum. Animals were assessed for 6 months with the same l-dopa dosing as presurgery as well as chronic oral l-dopa treatment. Presurgery LID was observed at doses greater than 5 mg/kg. The AAV-AADC-treated animals displayed an average 7.3-fold decrease in the therapeutic dose of l-dopa throughout the 6-month follow-up period. Only AAV-AADC-treated monkeys were susceptible to dyskinesias even at sub-clinical doses. Immunohistochemical analysis revealed well-delineated foci of AADC within the striatum. These results suggest that high levels of focal DA were generated in response to l-dopa administration and may be responsible for the exacerbation of dyskinesias. This may be similar to focal dopaminergic activity in PD patients that developed off-drug or "runaway" dyskinesias following fetal mesencephalic grafts.
Idioma original | English (US) |
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Páginas (desde-hasta) | 363-372 |
Número de páginas | 10 |
Publicación | Experimental Neurology |
Volumen | 197 |
N.º | 2 |
DOI | |
Estado | Published - feb 2006 |
Publicado de forma externa | Sí |
ASJC Scopus subject areas
- Neurology
- Developmental Neuroscience