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Liu P, Wu C, Song W, Yu L, Yang X, Xiang R, Wang F, Yang J. Uridine decreases morphine-induced behavioral sensitization by decreasing dorsal striatal dopamine release possibly via agonistic effects at GABAA receptors. Eur Neuropsychopharmacol 2014; 24:1557-66. [PMID: 25088943 DOI: 10.1016/j.euroneuro.2014.06.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 06/14/2014] [Accepted: 06/20/2014] [Indexed: 11/29/2022]
Abstract
Uridine, a potential endogenous neuromodulator, has been demonstrated to interact with the dopaminergic system and to regulate dopamine-related behaviors. The present study investigated the effects of uridine on morphine-induced hyperactivity and behavioral sensitization and on modulating dopaminergic neurotransmission in mice, which may help to understand how uridine and its metabolites act as modulators of the GABAA receptors. The results showed that either systemic (30 or 100mg/kg) or central (30, 100 or 300nM) uridine administration significantly attenuated the hyperactivity induced by acute morphine treatment in mice. Intracerebroventricular administration of uracil and β-alanine also inhibited morphine-induced hyperactivity. Uridine, a known modulator of the GABA receptors, increased the extracellular levels of GABA in the brain. In addition, the GABAA receptors antagonist bicuculline significantly attenuated the effects of uridine on morphine-induced hyperactivity, suggesting that the GABAA receptors potentially mediate the effects of uridine and its metabolites on morphine-related activity. It was also observed that morphine-induced locomotor sensitization was abolished after chronic uridine treatment. In vivo microdialysis demonstrated that uridine reversed morphine-induced dopamine release in the dorsal striatum of morphine-sensitized mice. In conclusion, these data suggest that the therapeutic effects of uridine and its metabolites on morphine-induced hyperactivity and established behavioral sensitization may be mediated in part by interfering with the dopaminergic system possibly via agonistic effects at GABAA receptors.
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Affiliation(s)
- Ping Liu
- Department of Pharmacology, Shenyang Pharmaceutical University, Box 31, 103 Wenhua Road, 110016 Shenyang, PR China
| | - Chunfu Wu
- Department of Pharmacology, Shenyang Pharmaceutical University, Box 31, 103 Wenhua Road, 110016 Shenyang, PR China
| | - Wu Song
- Department of Pharmacology, Shenyang Pharmaceutical University, Box 31, 103 Wenhua Road, 110016 Shenyang, PR China
| | - Lisha Yu
- Department of Pharmacology, Shenyang Pharmaceutical University, Box 31, 103 Wenhua Road, 110016 Shenyang, PR China
| | - Xiaofeng Yang
- Department of Pharmacology, Shenyang Pharmaceutical University, Box 31, 103 Wenhua Road, 110016 Shenyang, PR China
| | - Rongwu Xiang
- Mathematics Teaching & Research Section, Shenyang Pharmaceutical University, 110016 Shenyang, PR China
| | - Fang Wang
- Department of Pharmacology, Shenyang Pharmaceutical University, Box 31, 103 Wenhua Road, 110016 Shenyang, PR China
| | - Jingyu Yang
- Department of Pharmacology, Shenyang Pharmaceutical University, Box 31, 103 Wenhua Road, 110016 Shenyang, PR China.
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Song W, Wu CF, Liu P, Xiang RW, Wang F, Dong YX, Yang JY. Characterization of Basal and Morphine-Induced Uridine Release in the Striatum: An In Vivo Microdialysis Study in Mice. Neurochem Res 2012; 38:153-61. [DOI: 10.1007/s11064-012-0903-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Revised: 08/15/2012] [Accepted: 10/04/2012] [Indexed: 10/27/2022]
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Wang TL, Wu CF, Yang JY, Wang F, Song W. Effect of morphine on brain uracil release in mouse striatum detected by microdialysis. Neurosci Lett 2009; 457:89-92. [PMID: 19429169 DOI: 10.1016/j.neulet.2009.03.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2009] [Revised: 03/01/2009] [Accepted: 03/03/2009] [Indexed: 10/21/2022]
Abstract
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.
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Affiliation(s)
- Tian Lin Wang
- Department of Pharmacology, Shenyang Pharmaceutical University, Shenyang 110016, PR China
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Abstract
Roles for dietary sources of preformed purines and pyrimidines such as RNA in various systems have been demonstrated in recent years. These include maintenance of a competent immune system, gut development, hepatic function and many others, with a central theme of rapidly dividing cells requiring these compounds for optimal function. These compounds were previously thought to be non-essential but are now considered to be conditionally required when various stresses, including rapid growth and infection, are present. A number of recent studies are summarized that cover a variety of areas and are consistent with critical roles for dietary sources of nucleotides for many cellular functions.
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Affiliation(s)
- F B Rudolph
- Department of Biochemistry and Cell Biology, Rice University, Houston, TX 77251-1892, USA.
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Abstract
This paper is the twentieth installment of our annual review of research concerning the opiate system. It summarizes papers published during 1997 that studied the behavioral effects of the opiate peptides and antagonists, excluding the purely analgesic effects, although stress-induced analgesia is included. The specific topics covered this year include stress; tolerance and dependence; eating and drinking; alcohol; gastrointestinal, renal, and hepatic function; mental illness and mood; learning, memory, and reward; cardiovascular responses; respiration and thermoregulation; seizures and other neurologic disorders; electrical-related activity; general activity and locomotion; sex, pregnancy, and development; immunologic responses; and other behaviors.
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Affiliation(s)
- G A Olson
- Department of Psychology, University of New Orleans, LA 70148, USA
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