Dopamine receptor changes in response to prolonged treatment with L-dopa.
|
| Abstract |
Unilateral lesions of the nigro-striatal dopamine (DA) pathway induced contralateral rotations to apomorphine, increased (3H)-spiroperidol binding and enhanced the sensitivity of striatal adenylate cyclase to DA stimulation. Prolonged L-dopa administration counteracted the increased density of (3H)-spiroperidol binding sites but further enhanced the hypersensitivity of adenylate cyclase to DA and decreased the inhibitory effect of opiates on this enzyme. The apomorphine-induced contralateral rotations were also strongly potentiated. On the contrary the binding of (3H)-SCH-23390 was affected neither by DA nerve degeneration nor by chronic L-dopa treatment. These results suggest that DA-D1 and DA-D2 receptors are differently affected by prolonged L-dopa treatment. The biochemical changes of DA-D1 receptors associated with adenylate cyclase seem to be correlated with the enhanced behavioural responses to apomorphine and could be a consequence of a decreased opiate inhibitory tone on the enzyme. The increased supersensitivity of the DA-D1 receptors may play a role in the clinical changes seen in parkinsonian patients following chronic use of L-dopa.
|
|---|---|
| Authors | A Groppetti, C Flauto, E Parati, A Vescovi, L Rusconi, M Parenti |
| Journal | Journal of neural transmission. Supplementum (J Neural Transm Suppl) Vol. 22 Pg. 33-45 ( 1986) ISSN: 0303-6995 [Print] Austria |
| PMID | 2946813 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
| Chemical References |
|
| Topics |
|
Join CureHunter, for free Research Interface BASIC access!
Realize the full power of the drug-disease research graph!