Metabolic and pharmacokinetic evaluation of a novel 3-hydroxypyridinone iron chelator, CP502, in the rat

A recently synthesized 3-hydroxypyridinone derivative with an amido function at the 2-position, CP502 (1,6-dimethyl-3-hydroxy-4-(1H)-pyridinone-2-carboxy-(N-methyl)-amide hydrochloride), exhibited high in vitro iron chelating potency (pFe3+ =21.7). It was targeted as a new iron-chelating candidate f...

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Bibliographic Details
Published in:European journal of drug metabolism and pharmacokinetics 2004-10, Vol.29 (4), p.221-224
Main Authors: NOVAKOVIC, Jasmina, TESORO, Angelo, THIESSEN, Jake J, SPINO, Michael
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Drug Evaluation, Preclinical - methods
General and cellular metabolism. Vitamins
Iron Chelating Agents - metabolism
Iron Chelating Agents - pharmacokinetics
Male
Medical sciences
Pharmacology. Drug treatments
Pyridones - metabolism
Pyridones - pharmacokinetics
Rats
Rats, Sprague-Dawley
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Summary:A recently synthesized 3-hydroxypyridinone derivative with an amido function at the 2-position, CP502 (1,6-dimethyl-3-hydroxy-4-(1H)-pyridinone-2-carboxy-(N-methyl)-amide hydrochloride), exhibited high in vitro iron chelating potency (pFe3+ =21.7). It was targeted as a new iron-chelating candidate for further development in early pre-clinical testing. To evaluate its pharmacokinetics, including oral bioavailability, metabolic and disappearance profiles, studies were conducted in Sprague Dawley male rats. A single 150 mg/kg intravenous and oral dose was given to male Sprague Dawley rats (N=6, B.Wt. 250g). The rats were placed in metabolic cages and fasted overnight before the dosing. Venous blood samples (200 microL per withdrawal) were collected at defined time points before (blank) and up to 28 h post administration. Urine and feces were collected before dosing (blank) and in 24 h intervals up to 72 h post administration. Plasma CP502 concentration versus time profiles were consistent with two-compartment distribution, and the oral bioavailability approached 100%. Total clearance and mean residence time (i.v.) were 1.02 L/kg/h and 1.10 h, respectively. Simultaneous computer fitting yielded V1 and Vss estimates of 0.96 L/kg and 1.74 L/kg, respectively. CP502 was mainly excreted unchanged via urine (45.29+/-9.40 % of total dose) or as glucuronide (6.46+/-1.22% of total dose). High iron chelation potential and favorable pharmacokinetic and metabolic profiles indicate that CP502 is a promising candidate for further development.
ISSN:0378-7966
2107-0180
DOI:10.1007/BF03190602