[3H]3,4-methylenedioxymethamphetamine (MDMA) interactions with brain membranes and glass fiber filter paper.
The binding of [3H]3,4-methylenedioxymethamphetamine [( 3H]MDMA) to both rat brain membrane preparations and glass fiber filter papers was analyzed in the present study. Saturation studies indicate that [3H]MDMA binding is saturable and monophasic in both the presence and absence of rat brain membranes. This apparent 'specific' binding of [3H]MDMA in both the presence and absence of brain homogenates was totally eliminated by pretreating glass fiber filter papers with polyethylenimine. Drug competition studies demonstrated that [3H]MDMA binding displays a distinct 'pharmacological' profile in the absence of brain tissue. These data indicate that apparent [3H]MDMA binding to rat brain homogenates results from artifactual of [3H]MDMA to glass fiber filter paper. In addition, uptake of [3H]MDMA into rat brain synaptosomes could not be detected. We conclude the [3H]MDMA has limited usefulness in radioligand binding studies.
D015104:3,4-Methylenedioxyamphetamine / Q000031:analogs & derivatives / Q000378:metabolism*; D000662:Amphetamines / Q000378:metabolism*; D000818:Animals; D001921:Brain / Q000378:metabolism*; D002462:Cell Membrane / Q000378:metabolism; D005374:Filtration; D066298:In Vitro Techniques; D007700:Kinetics; D018817:N-Methyl-3,4-methylenedioxyamphetamine; D011869:Radioligand Assay; D051381:Rats; D012701:Serotonin / Q000378:metabolism; D014316:Tritium
D000662:Amphetamines; D014316:Tritium; D012701:Serotonin; D015104:3,4-Methylenedioxyamphetamine; D018817:N-Methyl-3,4-methylenedioxyamphetamine