Summary
The underlying cause of the long term complications of L-DOPA or dopamine agonist therapy in Parkinson’s disease remains unknown. Previous studies of repeated administration of L-DOPA or bromocriptine to rodents have shown increases, decreases or no change in brain dopaminergic activity. For this reason we have re-examined the effects of chronic L-DOPA or dopamine agonist administration on brain dopamine receptor function in rats.
Repeated intraperitoneal administration of L-DOPA to rats for 21 days followed by 3 days drug withdrawal caused an enhancement of apomorphine- induced stereotypy but no apparent alteration in striatal dopamine receptor numbers or affinity (as judged by 3H-spiperone; 3H-NPA and 3H-piflutixol binding).
Chronic oral administration of L-DOPA plus carbidopa to rats for one year was without effect on apomorphine-induced stereotypy or striatal D-2 dopamine receptors. Similarly, no effects were observed on striatal dopamine function following one year’s administration of bromocriptine. Pergolide produced an enhancement of apomorphine-induced stereotypy but a decrease in D-2 receptor density as judged by 3H-spiperone binding.
In rats with a unilateral 6-OHDA lesion of the medial forebrain bundle the oral administration of L-DOPA plus carbidopa for 4 weeks, followed by 4 days withdrawal, enhanced the rate of apomorphine-induced contraversive rotation.
It appears difficult, at least in rats, to manipulate striatal dopamine receptors with L-DOPA or dopamine agonist drugs. An enhancement of motor behaviour can occur in the presence of no change or a decrease in dopamine receptor numbers identified by in vitro ligand binding to tissue homogenates.
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Jenner, P., Boyce, S., Marsden, C.D. (1988). Receptor changes during chronic dopaminergic stimulation. In: Obeso, J.A., Horowski, R., Marsden, C.D. (eds) Continuous Dopaminergic Stimulation in Parkinson’s Disease. Journal of Neural Transmission, vol 27. Springer, Vienna. https://doi.org/10.1007/978-3-7091-8954-2_14
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DOI: https://doi.org/10.1007/978-3-7091-8954-2_14
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