Related Experiment Video
Updated: Jun 10, 2026
The 6-hydroxydopamine Rat Model of Parkinson's Disease
Published on: October 27, 2021
Prior treatment (priming) with caffeine sensitizes D2-dopamine-mediated contralateral rotational behavior in
Alexia E Pollack1, Kroum D Dimitrov, Jonathan D Drake
1Department of Biology, University of Massachusetts-Boston, Boston, MA 02125, USA. alexia.pollack@umb.edu
Background/Aims:
In unilaterally dopamine-depleted rats, repeated treatment with dopamine agonists sensitizes contralateral rotational behavior. Since A2a adenosine receptors are co-localized with D2 dopamine receptors in the brain, it was hypothesized that repeated treatment with the adenosine antagonist caffeine could sensitize D2 dopamine-mediated rotational behavior.
Methods:
Rats were unilaterally lesioned with 6-hydroxydopamine (6-OHDA), and pretreated (primed) with 3 injections of caffeine or water. One week later, rats were challenged with the D2 agonist quinpirole (0.25 mg/kg).
Results:
6-OHDA rats primed with caffeine (50 mg/kg) displayed contralateral rotational behavior following challenge with quinpirole - an effect not observed with caffeine (10 or 75 mg/kg) or water.
Conclusions:
These results suggest that prior administration of caffeine can sensitize D2 dopamine-mediated rotational behavior in dopamine-depleted rats.
