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Molecular Pharmacology

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Research ArticleArticle

Determination of Aryl Hydrocarbon Receptor Nuclear Translocator Protein Concentration and Subcellular Localization in Hepatic and Nonhepatic Cell Culture Lines: Development of Quantitative Western Blotting Protocols for Calculation of Aryl Hydrocarbon Receptor and Aryl Hydrocarbon Receptor Nuclear Translocator Protein in Total Cell Lysates

Jennifer L. Holmes and Richard S. Pollenz
Molecular Pharmacology August 1997, 52 (2) 202-211; DOI: https://doi.org/10.1124/mol.52.2.202
Jennifer L. Holmes
Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, South Carolina 29425
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Richard S. Pollenz
Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, South Carolina 29425
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Abstract

Western blot analysis was used to determine the concentration of the aryl hydrocarbon receptor nuclear translocator (ARNT) protein and aryl hydrocarbon receptor (AHR) in 11 mammalian cell culture lines derived from hepatic and nonhepatic tissues. The strategy was to first use Western blot analysis to determine the expression of ARNT or AHR in each cell line relative to its concentration in murine wild-type Hepa-1c1c7 (Hepa-1) cells. Actual ARNT and AHR concentrations in known amounts of total cell lysates were then determined by generating a standard curve with defined amounts of a highly purified ARNT or AHR protein and performing regression analysis. The results show that the level of ARNT expression in each of the cell lines is similar and represents ∼0.001–0.002% of total cellular protein. The range of expression was only ∼3-fold with wild-type Hepa-1 cells expressing the highest level of ARNT (33,000/cell) and canine kidney cells (MDCK line) expressing 14,000 ARNT molecules/cell. In contrast, the concentration of AHR varied by 65-fold over the different cell lines with the wild-type Hepa-1 expressing 323,000 AHR/cell and rat hepatoma cells (H4IIE) expressing 4700. The ratio of AHR to ARNT ranged from 0.3 in H4IIE cells to 10 in the Hepa-1 line with the majority of cells expressing 1–5 times more AHR than ARNT protein. Immunocytochemical staining of each cell line showed that ARNT was exclusively localized to the nuclear compartment and that a conserved nuclear localization signal mapped to the NH-terminal portion of the protein.

Footnotes

    • Received January 31, 1997.
    • Accepted April 30, 1997.
  • Send reprint requests to: Dr. Richard S. Pollenz, Dept. of Biochemistry and Molecular Biology, Medical University of South Carolina, 171 Ashley Avenue, Charleston, SC 29425-2211. E-mail:pollenzr{at}musc.edu

  • This project was funded in part by the Medical University of South Carolina Institutional Research Funds for 1995–1996.

  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 52 (2)
Molecular Pharmacology
Vol. 52, Issue 2
1 Aug 1997
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Research ArticleArticle

Determination of Aryl Hydrocarbon Receptor Nuclear Translocator Protein Concentration and Subcellular Localization in Hepatic and Nonhepatic Cell Culture Lines: Development of Quantitative Western Blotting Protocols for Calculation of Aryl Hydrocarbon Receptor and Aryl Hydrocarbon Receptor Nuclear Translocator Protein in Total Cell Lysates

Jennifer L. Holmes and Richard S. Pollenz
Molecular Pharmacology August 1, 1997, 52 (2) 202-211; DOI: https://doi.org/10.1124/mol.52.2.202

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Research ArticleArticle

Determination of Aryl Hydrocarbon Receptor Nuclear Translocator Protein Concentration and Subcellular Localization in Hepatic and Nonhepatic Cell Culture Lines: Development of Quantitative Western Blotting Protocols for Calculation of Aryl Hydrocarbon Receptor and Aryl Hydrocarbon Receptor Nuclear Translocator Protein in Total Cell Lysates

Jennifer L. Holmes and Richard S. Pollenz
Molecular Pharmacology August 1, 1997, 52 (2) 202-211; DOI: https://doi.org/10.1124/mol.52.2.202
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