Endogenous Uremic Substances are not Involved in the Reduced Hepatic Extraction of Metoprolol in Bilateral Ureter-Ligated Rats†

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  • TAGUCHI Masato
    Graduate School of Pharmaceutical Sciences, University of Toyama
  • URAI Misato
    Graduate School of Pharmaceutical Sciences, University of Toyama
  • TAIRA Shigehiro
    Graduate School of Pharmaceutical Sciences, University of Toyama
  • TANABE Hiroko
    Graduate School of Pharmaceutical Sciences, University of Toyama
  • HASHIMOTO Yukiya
    Graduate School of Pharmaceutical Sciences, University of Toyama

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  • Endogenous Uremic Substances are not Involved in the Reduced Hepatic Extraction of Metoprolol in Bilateral Ureter-Ligated Rats

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  The hepatic extraction of metoprolol is reduced in rats with bilateral ureter ligation (BUL)-induced renal failure. The aim of the present study was to evaluate the effect of uremic substances on the hepatic metabolism of metoprolol in rats with BUL. The metabolic rate in the liver microsomes of BUL rats was similar to that in sham rats, and there was no significant difference between sham and BUL rats in the effect of the supernatant of liver homogenates on the metabolism. The rate of metabolism in the liver microsomes in the presence of the plasma of BUL rats was also similar to that in the presence of the plasma of sham rats. These findings indicated that uremic substances which accumulate in BUL rats do not directly inhibit the activity of CYP2D2, which is responsible for the metabolism of metoprolol in the rat liver.<br>

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