Biomaterial Database

Alteration in regulation of serotonin release in rat dorsal raphe nucleus after prolonged exposure to morphine. 1998

R Tao, and Z Ma, and S B Auerbach

Department of Biological Sciences, Rutgers University, Piscataway, New Jersey, USA.

Regulation of serotonin (5-HT) release may be altered during the development of opioid tolerance and dependency. To test this hypothesis, changes in extracellular 5-HT during prolonged administration of morphine were determined by microdialysis in the dorsal raphe nucleus (DRN) of freely behaving rats. Morphine or placebo pellets were implanted s.c. As compared to placebo, morphine pellets induced a sustained, approximately 50% increase in DRN 5-HT and a significant elevation in hot plate latency during the 12-hr period after implantation. One week later DRN 5-HT had returned to control levels, and implanting additional morphine pellets had no effect on 5-HT or hot plate latency. One day after removing the pellets from rats exposed to morphine for 2 wk, acute challenge with morphine (20 mg/kg, s.c.) had a significantly smaller effect on 5-HT in the DRN as compared to the placebo treatment group. Administration of naltrexone to rats implanted with morphine pellets for 2 wk induced signs of withdrawal and a significant decrease in DRN 5-HT. These results suggest that the regulation of 5-HT release is altered during the development of tolerance to morphine. Thus, DRN 5-HT may be one of the factors involved in the changes in physiology and behavioral state during opioid withdrawal.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D009020	Morphine	The principal alkaloid in opium and the prototype opiate analgesic and narcotic. Morphine has widespread effects in the central nervous system and on smooth muscle.	Morphine Sulfate,Duramorph,MS Contin,Morphia,Morphine Chloride,Morphine Sulfate (2:1), Anhydrous,Morphine Sulfate (2:1), Pentahydrate,Oramorph SR,SDZ 202-250,SDZ202-250,Chloride, Morphine,Contin, MS,SDZ 202 250,SDZ 202250,SDZ202 250,SDZ202250,Sulfate, Morphine
D009271	Naltrexone	Derivative of noroxymorphone that is the N-cyclopropylmethyl congener of NALOXONE. It is a narcotic antagonist that is effective orally, longer lasting and more potent than naloxone, and has been proposed for the treatment of heroin addiction. The FDA has approved naltrexone for the treatment of alcohol dependence.	Antaxone,Celupan,EN-1639A,Nalorex,Naltrexone Hydrochloride,Nemexin,ReVia,Trexan,EN 1639A,EN1639A
D009293	Opioid-Related Disorders	Disorders related to or resulting from abuse or misuse of OPIOIDS.	Opiate Addiction,Opiate Dependence,Opioid Misuse,Opioid Use Disorder,Prescription Opioid Abuse,Prescription Opioid Misuse,Addiction, Opioid,Dependence, Opioid,Opiate Abuse,Opioid Abuse,Opioid Addiction,Opioid Dependence,Abuse, Opiate,Abuse, Opioid,Abuse, Prescription Opioid,Addiction, Opiate,Dependence, Opiate,Disorder, Opioid Use,Misuse, Opioid,Misuse, Prescription Opioid,Opiate Abuses,Opioid Abuse, Prescription,Opioid Abuses,Opioid Addictions,Opioid Dependences,Opioid Misuses,Opioid Related Disorders,Opioid Use Disorders,Opioid-Related Disorder,Prescription Opioid Abuses,Prescription Opioid Misuses
D009294	Narcotics	Agents that induce NARCOSIS. Narcotics include agents that cause somnolence or induced sleep (STUPOR); natural or synthetic derivatives of OPIUM or MORPHINE or any substance that has such effects. They are potent inducers of ANALGESIA and OPIOID-RELATED DISORDERS.	Analgesics, Narcotic,Narcotic Analgesics,Narcotic,Narcotic Effect,Narcotic Effects,Effect, Narcotic,Effects, Narcotic
D011903	Raphe Nuclei	Collections of small neurons centrally scattered among many fibers from the level of the TROCHLEAR NUCLEUS in the midbrain to the hypoglossal area in the MEDULLA OBLONGATA.	Caudal Linear Nucleus of the Raphe,Interfascicular Nucleus,Nucleus Incertus,Rostral Linear Nucleus of Raphe,Rostral Linear Nucleus of the Raphe,Superior Central Nucleus,Central Nucleus, Superior,Incertus, Nucleus,Nuclei, Raphe,Nucleus, Interfascicular,Nucleus, Raphe,Nucleus, Superior Central,Raphe Nucleus
D004361	Drug Tolerance	Progressive diminution of the susceptibility of a human or animal to the effects of a drug, resulting from its continued administration. It should be differentiated from DRUG RESISTANCE wherein an organism, disease, or tissue fails to respond to the intended effectiveness of a chemical or drug. It should also be differentiated from MAXIMUM TOLERATED DOSE and NO-OBSERVED-ADVERSE-EFFECT LEVEL.	Drug Tolerances,Tolerance, Drug,Tolerances, Drug
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D012701	Serotonin	A biochemical messenger and regulator, synthesized from the essential amino acid L-TRYPTOPHAN. In humans it is found primarily in the central nervous system, gastrointestinal tract, and blood platelets. Serotonin mediates several important physiological functions including neurotransmission, gastrointestinal motility, hemostasis, and cardiovascular integrity. Multiple receptor families (RECEPTORS, SEROTONIN) explain the broad physiological actions and distribution of this biochemical mediator.	5-HT,5-Hydroxytryptamine,3-(2-Aminoethyl)-1H-indol-5-ol,Enteramine,Hippophaine,Hydroxytryptamine,5 Hydroxytryptamine
D017207	Rats, Sprague-Dawley	A strain of albino rat used widely for experimental purposes because of its calmness and ease of handling. It was developed by the Sprague-Dawley Animal Company.	Holtzman Rat,Rats, Holtzman,Sprague-Dawley Rat,Rats, Sprague Dawley,Holtzman Rats,Rat, Holtzman,Rat, Sprague-Dawley,Sprague Dawley Rat,Sprague Dawley Rats,Sprague-Dawley Rats