Benzo- and cyclohexanomazindol analogues as potential inhibitors of the cocaine binding site at the dopamine transporter.
A series of mazindol (1), homomazindol (2), and bishomomazindol (3) derivatives with a benzo or cyclohexano ring fused at various sites were prepared as part of an SAR study to determine the effect of increased aliphatic and aromatic lipophilicity on selected in vitro assays used to identify potential cocaine-like and cocaine antagonism activity. Very good (IC(50) = 2-3 nM) inhibition of [(3)H] WIN 35,428 and [(125)I] RTI-55 binding on rat or guinea pig striatal membranes and HEK cells expressing cDNA for the human dopamine transporter (HEK-hDAT) was shown by the 8,9-benzomazindol 25 and 9,10-benzohomomazindol 28. All new compounds were weaker inhibitors of [(3)H] DA uptake in HEK-hDAT cells than 1 and 2. No improvement in the binding selectivity ratio (SERT/DAT and NET/DAT) was found when compared to 2. Compounds 25and 28 showed a considerable increase versus 1 in uptake/binding discrimination ratios at the DAT (311.0 and 182.1 vs 0.9), SERT (33.6 and 127.3 vs 1.9), and NET (7.3 and 10.0 vs 0.3).
Houlihan
William J
WJ
Charles A. Dana Research Institute, Drew University, Hall of Sciences, Madison, NJ 07940, USA. whouliha@drew.edu
Ahmad
Umer F
UF
Koletar
Judith
J
Kelly
Lawrence
L
Brand
Leonard
L
Kopajtic
Theresa A
TA
D000818:Animals; D001665:Binding Sites; D002460:Cell Line; D000697:Central Nervous System Stimulants / Q000378:metabolism*; D003042:Cocaine / Q000378:metabolism*; D003342:Corpus Striatum / Q000378:metabolism; D004298:Dopamine / Q000378:metabolism*; D050483:Dopamine Plasma Membrane Transport Proteins; D018765:Dopamine Uptake Inhibitors / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D006168:Guinea Pigs; D006801:Humans; D066298:In Vitro Techniques; D008297:Male; D008454:Mazindol / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D008562:Membrane Glycoproteins; D049990:Membrane Transport Modulators; D026901:Membrane Transport Proteins / Q000037:antagonists & inhibitors* / Q000378:metabolism; D009419:Nerve Tissue Proteins; D011869:Radioligand Assay; D051381:Rats; D017207:Rats, Sprague-Dawley; D013329:Structure-Activity Relationship
D000697:Central Nervous System Stimulants; D050483:Dopamine Plasma Membrane Transport Proteins; D018765:Dopamine Uptake Inhibitors; D008562:Membrane Glycoproteins; D049990:Membrane Transport Modulators; D026901:Membrane Transport Proteins; D009419:Nerve Tissue Proteins; C493214:SLC6A3 protein, human; C493216:Slc6a3 protein, rat; D008454:Mazindol; D003042:Cocaine; D004298:Dopamine