Abstract：
:The putative anti-addiction alkaloid ibogaine and its principal metabolite 12-hydroxyibogamine appear to act at the (+)-5 methyl-10,11,dihydro-5H- dibenzo[a,d]cycloheten-5-10-imine maleate (MK-801) binding site in the N-methyl-D-aspartate (NMDA)-receptor cation channel. This conclusion is based on findings that both compounds competitively displaced specific [3H]MK-801 binding to membranes from postmortem human caudate and cerebellum and from frog spinal cord. Ibogaine was 4-6-fold more potent than its metabolite and both compounds were less potent (50-1000-fold) than MK-801 binding to the NMDA receptor. In addition, ibogaine (100 microM) and 12-hydroxyibogamine (1 mM) blocked (85-90% of control) the ability of NMDA (100 microM, 5 s) to depolarize frog motoneurons in the isolated frog spinal cord. The prevention of NMDA-depolarizations in frog motoneurons showed use-dependency and was very similar to the block produced by MK-801. In view of the abilities of MK-801 to affect the responses to addictive substances in pre-clinical investigations, our results are compatible with the idea that the ability of ibogaine and 12-hydroxyibogamine to interrupt drug-seeking behavior may, in part, result from their actions at the MK-801 binding site.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Mash DC,Staley JK,Pablo JP,Holohean AM,Hackman JC,Davidoff RAdoi
10.1016/0304-3940(95)11608-ysubject
Has Abstractpub_date
1995-06-02 00:00:00pages
53-6issue
1eissn
0304-3940issn
1872-7972pii
030439409511608Yjournal_volume
192pub_type
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