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Research ArticleABSORPTION, DISTRIBUTION, METABOLISM, AND EXCRETION

Identification and Localization of Five CYP2Cs in Murine Extrahepatic Tissues and Their Metabolism of Arachidonic Acid to Regio- and Stereoselective Products

Cheng-Chung Tsao, Sherry J. Coulter, Anna Chien, Gang Luo, Natasha P. Clayton, Robert Maronpot, Joyce A. Goldstein and Darryl C. Zeldin
Journal of Pharmacology and Experimental Therapeutics October 2001, 299 (1) 39-47;
Cheng-Chung Tsao
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Sherry J. Coulter
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Anna Chien
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Gang Luo
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Natasha P. Clayton
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Robert Maronpot
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Joyce A. Goldstein
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Darryl C. Zeldin
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Abstract

The CYP2C subfamily has been extensively studied in humans with respect to the metabolism of clinically important drugs, and polymorphisms have been identified in these enzymes. In the present study, a murine model was used to determine the possible physiological functions and extrahepatic distribution of CYP2Cs. Using the reverse transcription-polymerase chain reaction (RT-PCR), Western blotting, and immununohistochemistry, this report demonstrates that the mouse CYP2Cs are extensively distributed in extrahepatic tissues and localized to heart muscle, lung Clara and ciliated cells, kidney collecting ducts, the X-zone of female adrenals, reproductive organs, white blood cells, and eyes (in the optic nerve, rods, and cones). RT-PCR, subcloning, and sequencing of the products indicate that each CYP2C has a unique tissue distribution. Four cDNA fragments representing potentially new CYP2Cs were identified, each with its own organ-specific pattern of expression. Using a bacterial cDNA expression system, we found that recombinant proteins for each of the five full-length murine CYP2Cs metabolize arachidonic acid to different regio- and stereospecific products, including epoxyeicosatrienoic acids and hydroxyeicosatetraenoic acids. Regio- and stereospecific metabolites of arachidonic acid have been reported to affect important physiological functions such as inflammation, neutrophil activation, ion transport, cellular proliferation, and vascular tone. Our results suggest that the presence of CYP2C enzymes in heart muscle, aorta, kidney, lung, adrenals, eyes, and reproductive organs could regulate important physiological and/or pathological processes in these tissues.

Footnotes

  • ↵1 Present address: DuPont Pharmaceuticals, Drug Metabolism and Pharmacokinetics, Stine-Haskell Research Center, Newark, DE 19714.

  • Abbreviations:
    CYP
    cytochrome P450
    AA
    arachidonic acid
    DHET
    dihydroxyeicosatrienoic acid
    EDHF
    endothelium-derived hyperpolarizing factor
    EET
    epoxyeicosatrienoic acid
    HETE
    hydroxyeicosatetraenoic acid
    HPLC
    high-performance liquid chromatography
    RT-PCR
    reverse transcription-polymerase chain reaction
    bp
    base pair(s)
    • Received March 15, 2001.
    • Accepted April 8, 2001.
  • U.S. Government
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Journal of Pharmacology and Experimental Therapeutics: 299 (1)
Journal of Pharmacology and Experimental Therapeutics
Vol. 299, Issue 1
1 Oct 2001
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Research ArticleABSORPTION, DISTRIBUTION, METABOLISM, AND EXCRETION

Identification and Localization of Five CYP2Cs in Murine Extrahepatic Tissues and Their Metabolism of Arachidonic Acid to Regio- and Stereoselective Products

Cheng-Chung Tsao, Sherry J. Coulter, Anna Chien, Gang Luo, Natasha P. Clayton, Robert Maronpot, Joyce A. Goldstein and Darryl C. Zeldin
Journal of Pharmacology and Experimental Therapeutics October 1, 2001, 299 (1) 39-47;

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Research ArticleABSORPTION, DISTRIBUTION, METABOLISM, AND EXCRETION

Identification and Localization of Five CYP2Cs in Murine Extrahepatic Tissues and Their Metabolism of Arachidonic Acid to Regio- and Stereoselective Products

Cheng-Chung Tsao, Sherry J. Coulter, Anna Chien, Gang Luo, Natasha P. Clayton, Robert Maronpot, Joyce A. Goldstein and Darryl C. Zeldin
Journal of Pharmacology and Experimental Therapeutics October 1, 2001, 299 (1) 39-47;
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