Send to

Choose Destination
Brain Res Bull. 2012 Feb 10;87(2-3):340-5. doi: 10.1016/j.brainresbull.2011.11.004. Epub 2011 Nov 15.

Intranasally applied L-DOPA alleviates parkinsonian symptoms in rats with unilateral nigro-striatal 6-OHDA lesions.

Author information

Center for Behavioral Neuroscience, University of Düsseldorf, Universitaetstrasse 1, 40225 Düsseldorf, Germany.


l-3,4-Dihydroxyphenylalanine (L-DOPA) remains the most effective drug for therapy of Parkinson's disease. However, the current clinical route of L-DOPA administration is variable and unreliable because of problems with drug absorption and first-pass metabolism. Administration of drugs via the nasal passage has been proven an effective alternate route for a number of medicinal substances. Here we examined the acute behavioral and neurochemical effects of intranasally (IN) applied L-DOPA in rats bearing unilateral lesions of the medial forebrain bundle, with severe depletion (97%) of striatal dopamine. Turning behavior in an open field, footslips on a horizontal grid and postural motor asymmetry in a cylinder were assessed following IN L-DOPA or vehicle administration with, or without, benserazide pre-treatment. IN L-DOPA without benserazide pre-treatment mildly decreased ipsilateral turnings and increased contralateral turnings 10-20 min after the treatment. IN L-DOPA with saline pre-treatment reduced contralateral forelimb-slips on the grid while no effects were evident in the cylinder test. These results support the hypothesis that L-DOPA can bypass the blood-brain barrier by the IN route and alleviate behavioral impairments in the hemiparkinsonian animal model.

[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center