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Research ArticleArticle

BUCOLOME, A POTENT BINDING INHIBITOR FOR FUROSEMIDE, ALTERS THE PHARMACOKINETICS AND DIURETIC EFFECT OF FUROSEMIDE: POTENTIAL FOR USE OF BUCOLOME TO RESTORE DIURETIC RESPONSE IN NEPHROTIC SYNDROME

Norito Takamura, Toru Maruyama, Etsuo Chosa, Keiichi Kawai, Yasuhiro Tsutsumi, Yukie Uryu, Keishi Yamasaki, Tsuneo Deguchi and Masaki Otagiri
Drug Metabolism and Disposition April 2005, 33 (4) 596-602; DOI: https://doi.org/10.1124/dmd.104.002782
Norito Takamura
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Toru Maruyama
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Etsuo Chosa
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Keiichi Kawai
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Yasuhiro Tsutsumi
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Yukie Uryu
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Keishi Yamasaki
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Tsuneo Deguchi
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Masaki Otagiri
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Abstract

To determine whether bucolome (5-n-butyl-1-cyclohexyl-2,4,6-trioxoperhydropyrimidine), a nonsteroidal anti-inflammatory agent, can reverse diuretic resistance of furosemide in patients with nephrotic syndrome, we examined the inhibitory effect of bucolome on the protein binding of furosemide in serum and urine. Bucolome significantly inhibited the protein binding of furosemide not only in serum but also in urine of preparation albumin (UPA), which mimics urinary albumin concentration in patients with nephrotic syndrome by ultrafiltration method. The binding percentage of furosemide to albumin was approximately 70% in UPA. With coadministration of bucolome to healthy volunteers, renal clearance of furosemide was increased, reflecting the increase of the free fraction of furosemide in serum. Furthermore, coadministration of bucolome caused a significant increase of urine volume and sodium concentration in urine. Even at higher urine levels of furosemide, the inhibitory effect of bucolome on the protein binding of furosemide in UPA remains constant, and changes in pH at weakly acidic pH levels (pH 5.5-6.5) did not alter the inhibitory effect of bucolome. Interestingly, coadministration of bucolome with furosemide in doxorubicin (Adriamycin)-induced nephrotic syndrome model rats alleviated the diuretic resistance. These results suggest that bucolome has a potent inhibitory effect on the protein binding of furosemide in the urine and can partially restore the diuretic response of furosemide in patients with nephrotic syndrome by increasing the free fraction of furosemide at the site of action.

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  • Article, publication date, and citation information can be found at http://dmd.aspetjournals.org.

  • doi:10.1124/dmd.104.002782.

  • ABBREVIATIONS: HSA, human serum albumin; UPA, urine of preparation albumin; RSA, rat serum albumin; NS rat, nephrotic syndrome model rat; HPLC, high-performance liquid chromatography; CLtot, total body clearance; CLr, renal clearance; AUC, area under the curve.

  • ↵1 Current address: Second Department of Clinical Pharmacy, School of Pharmaceutical Sciences, Kyushu University of Health and Welfare, Yoshino, Nobeoka, Japan.

    • Received October 29, 2004.
    • Accepted January 4, 2005.
  • The American Society for Pharmacology and Experimental Therapeutics
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Drug Metabolism and Disposition: 33 (4)
Drug Metabolism and Disposition
Vol. 33, Issue 4
1 Apr 2005
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Research ArticleArticle

BUCOLOME, A POTENT BINDING INHIBITOR FOR FUROSEMIDE, ALTERS THE PHARMACOKINETICS AND DIURETIC EFFECT OF FUROSEMIDE: POTENTIAL FOR USE OF BUCOLOME TO RESTORE DIURETIC RESPONSE IN NEPHROTIC SYNDROME

Norito Takamura, Toru Maruyama, Etsuo Chosa, Keiichi Kawai, Yasuhiro Tsutsumi, Yukie Uryu, Keishi Yamasaki, Tsuneo Deguchi and Masaki Otagiri
Drug Metabolism and Disposition April 1, 2005, 33 (4) 596-602; DOI: https://doi.org/10.1124/dmd.104.002782

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Research ArticleArticle

BUCOLOME, A POTENT BINDING INHIBITOR FOR FUROSEMIDE, ALTERS THE PHARMACOKINETICS AND DIURETIC EFFECT OF FUROSEMIDE: POTENTIAL FOR USE OF BUCOLOME TO RESTORE DIURETIC RESPONSE IN NEPHROTIC SYNDROME

Norito Takamura, Toru Maruyama, Etsuo Chosa, Keiichi Kawai, Yasuhiro Tsutsumi, Yukie Uryu, Keishi Yamasaki, Tsuneo Deguchi and Masaki Otagiri
Drug Metabolism and Disposition April 1, 2005, 33 (4) 596-602; DOI: https://doi.org/10.1124/dmd.104.002782
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