Biotransformation of deramciclane in primary hepatocytes of rat, mouse, rabbit, dog, and human.
The metabolic fate of deramciclane [(1R,2S,4R)-(-)-2-phenyl-2-(2'-dimethylamino-ethoxy)-1,7,7-trimethyl-bicyclo[2.2.1]heptane], a new anxiolytic drug candidate, has been determined in rat, mouse, rabbit, dog, and human hepatocytes. Rat and rabbit cells were the most active, whereas the rate of metabolism was quite slow in human hepatocytes. During biotransformation, deramciclane underwent side chain modification and oxidation at several positions of the molecule. The side chain modification led to the formation of N-desmethyl deramciclane and phenylborneol. The oxidation of deramciclane resulted in several hydroxy-, carboxy-, and N-oxide derivatives. The hydroxylation took place at primary or secondary carbons of the camphor ring as well as at the side chain; furthermore, dihydroxylated derivatives were also found. The side chain-modified metabolites were also oxidized to hydroxy- or carboxy-derivatives. Conjugation of phase I metabolites, as a route of elimination, was also observed in rat, rabbit, and dog hepatocytes. Although there were some species differences in biotransformation of deramciclane, it was concluded that phase I metabolism in human liver cells seemed to be similar to the metabolism in the hepatocytes isolated from rat. With careful approach, the rat model may be considered to be predictive for human metabolism of deramciclane.
Monostory
Katalin
K
Chemiacl Research Center, Hungarian Academy of Sciences, Budapest, Hungary. monostor@chemres.hu
Kohalmy
Krisztina
K
Ludányi
Krisztina
K
Czira
Gábor
G
Holly
Sándor
S
Vereczkey
László
L
Urmös
Iván
I
Klebovich
Imre
I
Kóbori
László
L
D000818:Animals; D001892:Camphanes / Q000378:metabolism*; D002384:Catalysis; D018929:Cell Culture Techniques; D002478:Cells, Cultured; D004285:Dogs; D008401:Gas Chromatography-Mass Spectrometry; D022781:Hepatocytes / Q000378:metabolism*; D006801:Humans; D008297:Male; D051379:Mice; D023421:Models, Animal; D011817:Rabbits; D051381:Rats; D017208:Rats, Wistar; D012702:Serotonin Antagonists / Q000378:metabolism*; D013045:Species Specificity; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013055:Spectrophotometry, Infrared
D001892:Camphanes; D012702:Serotonin Antagonists; C060555:deramciclane