Abstract
The potential neuroprotective or neurotoxic effects of 3,4-dihydroxyphenylalanine (L-DOPA) are yet to be understood. We examined the behavioral, immunohistochemical, tyrosine hydroxylase (TH) expression and neurochemical parameters after an intranigral administration of L-DOPA (10 μM) in rats.. L-DOPA elicited a 30.5% reduction in dopaminergic neurons, while 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) (100 μg μL−1) produced a 53.6% reduction. A combined infusion of MPTP and L-DOPA generated a 42% reduction of nigral neurons. Motor parameters revealed that both the MPTP and L-DOPA groups presented impairments; however, the concomitant administration evoked a partial restorative effect. In addition, MPTP and L-DOPA separately induced reductions of TH protein expression within the substantia nigra. In contrast, the coadministration of MPTP and L-DOPA did not demonstrate such difference. The striatal levels of dopamine were reduced after MPTP or L-DOPA, with an increased turnover only for the MPTP group. In view of such results, it seems reasonable to suggest that L-DOPA could potentially produce dopaminergic neurotoxicity.
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Abbreviations
- DA:
-
Dopamine
- L-DOPA:
-
3,4-dihydroxyphenylalanine
- MPTP:
-
1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine
- PD:
-
Parkinson’s disease
- SN:
-
Substantia nigra
- SNpc:
-
Substantia nigra pars compacta
- TH-ir:
-
Tyrosine hydroxylase immunoreactive
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Acknowledgments
This work was supported by AFIP, FAPESP, and CAPES (PRODOC-Farmacologia UFSC to MMSL). The authors thank Mr. Adriano Zager and Mrs. Marilde Aires Costa for the technical assistance and Dr. Cláudio da Cunha for the HPLC analyses. MLA, ST, and MABFV are recipients of CNPq fellowships.
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Reksidler, A.B. et al. (2009). Distinct Effects of Intranigral L-DOPA Infusion in the MPTP Rat Model of Parkinson’s Disease. In: Giovanni, G., Di Matteo, V., Esposito, E. (eds) Birth, Life and Death of Dopaminergic Neurons in the Substantia Nigra. Journal of Neural Transmission. Supplementa, vol 73. Springer, Vienna. https://doi.org/10.1007/978-3-211-92660-4_21
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