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Abstract

Excretion and metabolism of tipredane, a novel glucocorticoid, in the rat, mouse, monkey, and human.

A E Cooper, A J Gray, J Collington, H Seddon, I Beattie and C J Logan
Drug Metabolism and Disposition October 1996, 24 (10) 1071-1080;
A E Cooper
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A J Gray
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J Collington
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H Seddon
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I Beattie
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C J Logan
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Abstract

The excretion and metabolism of [3H]tipredane, a novel glucocorticoid, has been studied in mice, rats, marmosets, rhesus and cynomolgus monkeys, and humans. After oral administration, [3H]tipredane was rapidly absorbed, metabolized, and excreted into urine and feces. In mice and male rats, radioactivity was excreted primarily into feces or bile, whereas in female rats, monkeys, and humans, excretion was mainly via the renal route. Some sex differences in the proportions excreted into urine and feces were noted in rodents, with females eliminating relatively more radioactivity in urine. Tipredane was shown to be extensively metabolized, but the routes were highly species-dependent and, in the rat, they were sex-dependent. Unchanged tipredane was not detected in any urine, bile, or blood extracts. Urinary and blood extract profiles indicated that there were between 10 and 30 metabolites in rats and mice, the majority of which constituted < 2% of the dose. In these species, the major pathways involved loss of the thioethyl moiety, S-oxidation of the thiomethyl group, and saturation of the adjacent saturated C16-17 bond. Hydroxylation of the steroid B-ring was seen in the 7 alpha-position in mice and female rats, and in the 6 beta-position in male rats. Metabolism of tipredane in rhesus and cynomolgus monkeys and humans was similar, but less extensive and different to that seen in rodents. The major products, the 6 beta-hydroxylated sulfoxide and sulfone metabolites of tipredane, accounted for 21-36% of the dose in human and monkey urine, and were also major components in blood. In contrast to mice and rats, S-oxidation and an unsaturated C16-17 bond were evident in primates. Metabolism of tipredane was rapid and complex, with significant species differences, although the disposition in rhesus and cynomolgus monkeys seemed to be similar to humans.

 

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Drug Metabolism and Disposition
Vol. 24, Issue 10
1 Oct 1996
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Abstract

Excretion and metabolism of tipredane, a novel glucocorticoid, in the rat, mouse, monkey, and human.

A E Cooper, A J Gray, J Collington, H Seddon, I Beattie and C J Logan
Drug Metabolism and Disposition October 1, 1996, 24 (10) 1071-1080;

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Abstract

Excretion and metabolism of tipredane, a novel glucocorticoid, in the rat, mouse, monkey, and human.

A E Cooper, A J Gray, J Collington, H Seddon, I Beattie and C J Logan
Drug Metabolism and Disposition October 1, 1996, 24 (10) 1071-1080;
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