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- W118964501 abstract "8-Methoxypsoralen (8-MOP), a photoactive linear furocoumarin, is effective in the treatment of several diseases, including psoriasis, mycosis fungoides and T-cell leukemia. Recently, a specific extraction procedure for /sup 14/C-8-MOP showed that the elimination of 8-MOP in the rat was dose-dependent. Similar pharmacokinetic studies were undertaken in mice. Purity of /sup 14/C-8-MOP, verified by a four-tube countercurrent distribution using hexane (8 ml) and pH 7.4 phosphate buffer (0.1 M 15 ml) as described by Bush, was >98% and distributed with a partition coefficient of 3.86. Male CD-1 mice were each given an i.p. dose of 10 or 50 mg/kg of /sup 14/C-8-MOP (3.4 ..mu..Ci/mg) sacrificed at timed intervals, homogenized in 150 ml of 0.1 M phosphate buffer (pH 7.4) and a portion (0.8 ml) of the homogenate used to quantify 8-MOP as described above. The elimination half-life measured in the first 45 min was 7.4 min at 10 mg/kg and 95 min at 50 mg/kg. A similar half-life of 9.2 min was measured in mice given an i.v. dose 10 mg/kg of 8-MOP. Explanations of dose-dependent elimination include enzyme saturation, product inhibition or both. Between 58-80% of the administered radioactivity was recovered in the urine within 24 hr. Nine peaks ofmore » radioactivity were observed in the urine by HPLC, two of which coeluted with 5,8-dihydroxypsoralen and 6-(7-hydroxy-8-methoxycoumaryl)-acetic acid.« less" @default.
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- W118964501 date "1986-03-01" @default.
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- W118964501 title "Dose-dependent elimination of 8-methoxypsoralen in the mouse" @default.
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