Specificity and efficacy of noradrenaline, serotonin depletion in discrete brain areas of Swiss mice by neurotoxins.
The aim of this work is to define neurotoxins doses to have efficient and specific depletion of noradrenaline (NA), serotonin (5-HT) neurotransmission in cortex, striatum, hippocampus and hypothalamus of Swiss mice after intraperitoneal administration of, respectively, N-(2-chloroethyl)-N-ethyl-2-bromobenzylamine hydrochloride (DSP-4) and para-chlorophenylalanine methyl ester hydrochloride (PCPA). The neurotransmitters concentrations were determined by high performance liquid chromatography with amperometric detection. The minimal single dose necessary to produce a highly significant decrease of NA levels (p<0.01 in comparison with control group) in hypothalamus (-44%), hippocampus (-91%), striatum (-40%) and cortex (-68%) was 50mg/kg but DA and 5-HT levels were modified, respectively, in hypothalamus and striatum. Three doses of PCPA 300 mg/kg over 3 consecutive days involve a profound depletion of 5-HT transmission in all discrete brain areas but NA and DA levels were also significantly reduced. In conclusion, DSP-4 has a different efficacy in discrete brain areas with a noradrenergic specificity which is not absolute, PCPA has a similar efficacy in all brain areas but is unspecific of 5-HT transmission.
Dailly
Eric
E
EA Neurobiologie de l'Anxiété et la Dépression, Faculté de Médecine de Nantes, Laboratoire de Pharmacologie Clinique, Institut de Biologie, Centre Hospitalier Universitaire, 9 quai Moncousu, 44093 Nantes Cedex 1, France. eric.dailly@chu-nantes.fr
Chenu
Franck
F
Petit-Demoulière
Benoit
B
Bourin
Michel
M
D000818:Animals; D001596:Benzylamines / Q000494:pharmacology; D001921:Brain / Q000187:drug effects* / Q000378:metabolism*; D002540:Cerebral Cortex / Q000187:drug effects / Q000378:metabolism; D003342:Corpus Striatum / Q000187:drug effects / Q000378:metabolism; D010134:Fenclonine / Q000031:analogs & derivatives / Q000494:pharmacology; D006624:Hippocampus / Q000187:drug effects / Q000378:metabolism; D007031:Hypothalamus / Q000187:drug effects / Q000378:metabolism; D007274:Injections, Intraperitoneal; D008297:Male; D051379:Mice; D009498:Neurotoxins / Q000494:pharmacology*; D014179:Neurotransmitter Uptake Inhibitors / Q000494:pharmacology; D009638:Norepinephrine / Q000378:metabolism*; D012701:Serotonin / Q000378:metabolism*
D001596:Benzylamines; D009498:Neurotoxins; D014179:Neurotransmitter Uptake Inhibitors; C020261:4-chlorophenylalanine methyl ester; D012701:Serotonin; C012102:DSP 4; D010134:Fenclonine; D009638:Norepinephrine