Journal
BEHAVIOURAL BRAIN RESEARCH
Volume 222, Issue 2, Pages 315-320Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bbr.2011.03.057
Keywords
Parkinson disease; 6-Hydroxydopamine; Tongue deficits; Dopamine; Dysphagia; Rat
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Funding
- NIDCD NIH HHS [R01 DC005935, R01 DC008149, P30 DC010754-01, P30 DC010754, R01 DC005935-06, R01 DC008149-04] Funding Source: Medline
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Deficits in tongue function in conjunction with airway compromise can contribute to dysphagia associated with Parkinson disease (PD). However, it is unknown if these deficits are related to the primary disease pathology in PD, nigrostriatal dopamine depletion. To directly study the impact of striatal dopamine depletion on tongue function, we used unilateral infusion of the neurotoxin 6-hydroxydopamine (6-OHDA) into the medial forebrain bundle and measured tongue force and timing parameters during a complex tongue protrusion task for a water reward. Maximal and average forces were significantly diminished and average press time was significantly longer after neurotoxin administration, reflecting aspects of bradykinesia and hypokinesia associated with PD. Our findings suggest that even unilateral deficits to the nigrostriatal dopamine system may be contributing to some of the lingual sensorimotor deficits seen in PD. Because previous research in rat models of PD has shown that targeted training of the limb can rescue behavioral deficits and spare striatal dopamine neurons, early intervention for cranial sensorimotor deficits may also be indicated. (C) 2011 Elsevier B.V. All rights reserved.
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