Summary
Our group investigated modulatory effects of apomorphine on cerebral activation patterns during finger tapping movements in six healthy right-handed volunteers using an established fMRI protocol. Apomorphine application disclosed a reduction of cerebral activation to the contralateral precentral and postcentral gyrus and ipsilateral cerebellum, with a prominent net reduction of BOLD signal in cerebellar areas. These findings contradict those of similar studies performed on dopaminergic function and Parkinson’s disease (PD), which predominantly found augmentation of cerebral activation patterns in normal volunteers and PD patients after dopaminergic stimulation . One conceivable explanation for our singular results would be preferred binding of apomorphine to presynaptic dopaminergic receptors, leading to inhibition of endogenous dopamine release and resultant diminished dopaminergic stimulation, reflected in diminished cerebral activation patterns. These findings warrant future consideration and further investigation of possible central inhibitory effects of dopaminergic therapy in functional imaging studies of the dopaminergic system in general and PD in particular.
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Schmid, G. et al. (2004). Impact of apomorphine on BOLD signal during movement in normals. In: Müller, T., Riederer, P. (eds) Focus on Extrapyramidal Dysfunction. Journal of Neural Transmission. Supplementa, vol 68. Springer, Vienna. https://doi.org/10.1007/978-3-7091-0579-5_8
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DOI: https://doi.org/10.1007/978-3-7091-0579-5_8
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