Effect of MDL 73,745 on acetylcholine and biogenic amine levels in rat cortex

• Published in: European journal of pharmacology 1995-03, Vol.276 (1), p.93-99
• Main Authors: Zhu, Xiao-dong, Giacobini, Ezio, Hornsperger, Jean-Marie
• Format: Article
• Language: English
• Subjects: 5-HT (5-hydroxytryptamine, serotonin); Acetophenones - pharmacology; Acetylcholine; Acetylcholine - analysis; Animals; Biological and medical sciences; Cerebral Cortex - chemistry; Cerebral Cortex - drug effects; Cholinesterase; Cholinesterase Inhibitors - pharmacology; Dopamine; Dopamine - analysis; Dose-Response Relationship, Drug; Male; MDL 73,745; Medical sciences; Microdialysis; Miscellaneous; Neuropharmacology; Norepinephrine; Norepinephrine - analysis; Pharmacology. Drug treatments; Rats; Rats, Sprague-Dawley; Serotonin - analysis; Trimethylsilyl Compounds - pharmacology
• ISSN: 0014-2999; 1879-0712
• DOI: 10.1016/0014-2999(95)00014-C

We postulate that the effect of cholinesterase inhibitors to ameliorate the cholinergic deficit in Alzheimer's disease is related to their ability to maintain long-lasting, non-toxic steady-state levels of acetylcholine in cortex. We investigated the effect of the cholinesterase inhibitor, MDL 73,745 (2,2,2-trifluoro-1-(3-trimethylsilylphenyl)ethanone), on the extracellular levels of acetylcholine, norepinephrine, dopamine and 5-hydroxytryptamine in the cerebral cortex of the rat by high-performance liquid chromatography coupled with electrochemical detection. The drug significantly increased acetylcholine levels above the baseline at 2 and 10 mg/kg s.c., but not at the 1 mg/kg dose. At both 2 and 10 mg/kg, there was a good correlation between cholinesterase inhibition and acetylcholine increase in cortex. At the 2 and 10 mg/kg doses, the maximal cholinesterase inhibition was 64% and 77%, respectively, and the increase in acetylcholine release was 481% and 1016%, respectively. Norepinephrine and dopamine, but not 5-hydroxytryptamine levels, were also significantly increased by the 10 mg/kg dose. The increases of norepinephrine and dopamine levels reached a maximum of 124% and 370%, respectively, and continued for a period of at least 8 h. Cholinergic side-effects were most marked at the 10 mg/kg dose but were also noticeable at the 2 mg/kg dose in the form of fasciculations, tremor and splay.