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BACKGROUND (+/-)3,4-methylenedioxymethamphetamine (MDMA, "Ecstasy") is a popular recreational drug that selectively damages brain serotonin (5-HT) neurons in animals at doses that closely approach those used by humans. We investigated the status of brain 5-HT neurons in MDMA users. METHODS We enrolled 14 previous users of MDMA who were currently(More)
Recently, we have developed the positron emitting radiotracer N1'-([11C]methyl)naltrindole ([11C]MeNTI) and demonstrated its high selectivity for delta opioid receptors in the mouse brain [Lever et al. (1992) Eur. J. Pharmacol., 216:449-450]. In the present study, we examined the selectivity of [11C]MeNTI for the delta opioid receptor in the human brain,(More)
The present study evaluated short- and long-term effects of MDMA (3,4-methylenedioxymethamphetamine) in the baboon brain using PET and [11C](+)McN 5652, a potent 5-HT transporter ligand, as well as [11C]RTI-55, a cocaine derivative which labels both 5-HT and dopamine transporters. Following baseline PET scans with [11C](+)McN5652, [11C](-)McN5652 (the(More)
Competition by endogenous dopamine with the binding of D2 dopamine receptor ligands may be important in the interpretation of positron emission tomography (PET) neuroreceptor studies. PET studies with N-methylspiperone (NMSP) have revealed increased D2 dopamine receptors in schizophrenia, whereas studies with raclopride (RAC) have not detected such(More)
This paper presents the first Positron Emission Tomography (PET) images of the serotonin (5-hydroxytryptamine, 5-HT) transporter in the living human brain. PET imaging was performed in three healthy subjects after administration of [11C](+)McN5652 (the (+) enantiomer of trans-1,2,3,5,6,10 beta-hexahydro- 6-[4-(methylthio) phenyl]pyrrolo-[2,1-a](More)
The present study examined short- and long-term effects of MDMA (3,4-methylene-dioxymethamphetamine) on serotonin (5-HT2 and 5-HT1c) receptors in the brain of the rat. N1-Methyl-2-[125I]lysergic acid diethylamide ([125I]MIL) was used to label these receptors in vitro and in vivo. The usefulness of [125I]MIL for in vivo detection of changes in 5-HT2(More)
The recreational drug, (+/-)3,4-methylenedioxymethamphetamine (MDMA, 'Ecstasy'), is a potent serotonin (5-HT) neurotoxin in animals. Whether humans who use MDMA incur 5-HT neural injury is unknown. The present studies utilized positron emission tomography (PET) in conjunction with the 5-HT transporter ligand, [11C]McN-5652 to assess the status of brain 5-HT(More)
[123I]RTI-55, an iodinated derivative of the cocaine analog 3 beta-phenyltropane-2 beta-carboxylic acid methyl ester, was evaluated as an agent for in vivo labeling of the serotonin transporter. Labeling of the precursor of RTI-55 with I-123 was efficient and yielded a high specific activity product. After intravenous injection of [123I]RTI-55 into rats,(More)
[11C]WIN 35,428 (also designated [11C]CFT) is now being used in several positron emission tomography (PET) centers to image dopamine (DA) transporter sites in the mammalian brain. Whether and to what extent in vivo WIN 35,428 binding is influenced by intra- and extrasynaptic dopamine levels are largely unknown. The purpose of the present study was to(More)
UNLABELLED Nicotinic acetylcholine receptors (nAChRs) have been implicated in a variety of central processes, such as learning and memory and analgesia. These receptors also mediate the reinforcing properties of nicotine in tobacco products and are increased in postmortem samples of brains of smokers. On the other hand, brains of individuals who have died(More)