In vitro and in vivo metabolism of CHF 6001, a selective phosphodiesterase (PDE4) inhibitor.
1. The metabolism of CHF 6001, a novel PDE4 inhibitor, was determined in vitro in mouse, rat, dog, monkey and human microsomes and hepatocytes and in vivo in plasma, urine, feces and bile of rats after intravenous and intratracheal administration. 2. The behavior of CHF 6001 in microsomes and hepatocytes changed across species. CYP3A4/5 isoenzymes were identified to be the primary enzymes responsible for the metabolism of CHF 6001 in human liver microsomes. 3. In the rat, CHF 6001 was found extensively metabolized in urine, feces and bile, but not in plasma, where CHF 6001 was the main compound present. The metabolite profiles were different in the four biological matrices from both qualitative and quantitative point of view. 4. CHF 6001 was metabolized through hydrolysis with the formation of the alcohol CHF 5956, loss of a chlorine atom, loss of the N-oxide, hydroxylation, loss of the cyclopropylmethyl group in the alcohol moiety, conjugation with glucuronic acid, glutathione and cysteine-glycine. 5. The major metabolite present in the bile was isolated and characterized by nuclear magnetic resonance analysis. It derived from CHF 6001 through contraction of the pyridine-N-oxide ring to N-hydroxy pyrrole and conjugation with glucuronic acid.
Department of DMPK, Chiesi Farmaceutici Spa , Parma , Italy and.
Valentina
V
Cenacchi
Rosangela
R
Battaglia
Flavio
F
Cinato
Benedetta
B
Riccardi
Daniele
D
Spinabelli
Giandomenico
G
Brogin
Paola
P
Puccini
Daniele
D
Pezzetta
D061605:Administration, Intravenous; D000818:Animals; D001646:Bile / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D004285:Dogs; D005243:Feces / Q000737:chemistry; D000882:Haplorhini; D022781:Hepatocytes / Q000378:metabolism*; D006801:Humans; D008297:Male; D051379:Mice; D008862:Microsomes, Liver / Q000378:metabolism*; D058988:Phosphodiesterase 4 Inhibitors / Q000008:administration & dosage / Q000097:blood / Q000378:metabolism* / Q000652:urine; D010727:Phosphoric Diester Hydrolases / Q000378:metabolism*; D011758:Pyrroles / Q000378:metabolism*; D051381:Rats; D013045:Species Specificity; D053719:Tandem Mass Spectrometry
D058988:Phosphodiesterase 4 Inhibitors; D011758:Pyrroles; D010727:Phosphoric Diester Hydrolases
CYP450; PDE4; hepatocytes; microsomes; rat; structure identification