Rat genomic clones were used to quantitate preprotachykinin mRNAs in the rat basal ganglia, while the tachykinin peptide products substance P and substance K were measured by radioimmunoassay. Administration of the dopamine antagonist (antipsychotic) drug haloperidol significantly decreased substance P, substance K, and both α (substance P encoding) and β (substance P/substance K encoding) preprotachykinin mRNAs, suggesting a drug-induced decrease in striatonigral tachykinin biosynthesis. The time course for decreased preprotachykinin mRNAs and tachykinins apparently parallels the period of maximum risk for the development of certain antipsychotic drug-induced extrapyramidal side effects seen clinically. Tachykinin interaction with dopamine neurons may play an important role in the modulation of basal ganglia function.
|Number of pages||3|
|Journal||Journal of Biological Chemistry|
|State||Published - Dec 1 1986|