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Research ArticleABSORPTION, DISTRIBUTION, METABOLISM, AND EXCRETION

Metabolism of Antisense Oligonucleotides in Rat Liver Homogenates

Rosanne M. Crooke, Mark J. Graham, Michael J. Martin, Kristina M. Lemonidis, Tad Wyrzykiewiecz and Lendell L. Cummins
Journal of Pharmacology and Experimental Therapeutics January 2000, 292 (1) 140-149;
Rosanne M. Crooke
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Mark J. Graham
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Michael J. Martin
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Kristina M. Lemonidis
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Tad Wyrzykiewiecz
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Lendell L. Cummins
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Abstract

Phosphorothioate antisense oligodeoxynucleotides are novel therapeutic agents designed to selectively and specifically inhibit production of various disease-related gene products. In vivo pharmacokinetic experiments indicate that these molecules are widely distributed in many species, with the majority of oligomers accumulating within liver and kidney. To better understand the metabolism of these agents, we studied the stability of several phosphorothioate oligodeoxynucleotides, their congeners, and second generation oligomer chemistries in rat liver homogenates. To examine metabolism, background nuclease activity was characterized in whole liver homogenates by using ISIS 1049, a 21-mer phosphodiester oligodeoxynucleotide. Nuclease activity could readily be detected in liver homogenates. Under optimized conditions, the predominant enzymatic activity was 3′-exonucleolytic and could be influenced by pH and ionic conditions. However, in addition to 3′ exonucleases, 5′ exo- and endonuclease activities were also observed. Our data indicate that metabolism of phosphorothioate oligodeoxynucleotides was more complex than that of phosphodiesters for many reasons, including phosphorothioate oligodeoxynucleotide inhibition of nucleases and the presence ofRp and Spstereoisomers. The rate of phosphorothioate metabolism also appeared to be influenced by sequence, with pyrimidine-rich compounds being metabolized to a greater extent than purine-rich oligomers. Other factors affecting stability included oligomer chemistry and length. Concomitant experiments performed in rats dosed systemically with the same compounds mimic the activities seen in vitro and suggest that this liver homogenate system is a valuable model with which to study the mechanism of metabolism of antisense oligonucleotides.

Footnotes

  • Send reprint requests to: Dr. Rosanne M. Crooke, Isis Pharmaceuticals, Carlsbad Research Center, 2292 Faraday Ave., Carlsbad, CA 92008. E-mail:rcrooke{at}isisph.com

  • Abbreviations:
    CGE
    capillary gel electrophoresis
    DEPSE
    2-(diphenylmethylsilyl)ethyl
    ES/MS
    electrospray mass spectrometry
    SPE
    solid phase extraction
    t50%
    time to degrade compound by 50%
    • Received May 18, 1999.
    • Accepted September 14, 1999.
  • The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics: 292 (1)
Journal of Pharmacology and Experimental Therapeutics
Vol. 292, Issue 1
1 Jan 2000
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Research ArticleABSORPTION, DISTRIBUTION, METABOLISM, AND EXCRETION

Metabolism of Antisense Oligonucleotides in Rat Liver Homogenates

Rosanne M. Crooke, Mark J. Graham, Michael J. Martin, Kristina M. Lemonidis, Tad Wyrzykiewiecz and Lendell L. Cummins
Journal of Pharmacology and Experimental Therapeutics January 1, 2000, 292 (1) 140-149;

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Research ArticleABSORPTION, DISTRIBUTION, METABOLISM, AND EXCRETION

Metabolism of Antisense Oligonucleotides in Rat Liver Homogenates

Rosanne M. Crooke, Mark J. Graham, Michael J. Martin, Kristina M. Lemonidis, Tad Wyrzykiewiecz and Lendell L. Cummins
Journal of Pharmacology and Experimental Therapeutics January 1, 2000, 292 (1) 140-149;
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