Effect of morphine on brain uracil release in mouse striatum detected by microdialysis.
Effect of acute treatment of morphine is associated with neurotransmitter and neuromodulator changes in the brain. A possible relationship between pyrimidines and morphine has also been discussed. Uracil, a common and naturally occurring pyrimidine derivative which found in RNA, has been suggested to modulate many neurotransmitters or neuromodulators, especially in the mature central nervous system. The present study was performed to determine the effect of acutely intraperitoneal morphine treatment on the release of uracil in mouse striatum. The results showed that morphine significantly decreased the release of uracil at the dose of 10 and 20mg/kg in a dose dependent manner. Naloxone could reverse the morphine-induced reduction of uracil levels in mouse striatum, at the dose of 4 mg/kg, without affecting basal uracil release. The results suggest that the extracellular level of uracil in mouse striatum could be specifically regulated by the centrally acting drugs, such as morphine. However, the pharmacological implications of such regulation should be further evaluated.
Department of Pharmacology, Shenyang Pharmaceutical University, Shenyang 110016, PR China.
Tian Lin
TL
Wang
Chun Fu
CF
Wu
Jing Yu
JY
Yang
Fang
F
Wang
Wu
W
Song
D000818:Animals; D002851:Chromatography, High Pressure Liquid; D003342:Corpus Striatum / Q000378:metabolism*; D051379:Mice; D017551:Microdialysis; D009020:Morphine / Q000494:pharmacology*; D009270:Naloxone / Q000494:pharmacology; D009292:Narcotic Antagonists / Q000494:pharmacology; D009294:Narcotics / Q000494:pharmacology*; D014498:Uracil / Q000378:metabolism*
D009292:Narcotic Antagonists; D009294:Narcotics; D009270:Naloxone; D014498:Uracil; D009020:Morphine