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Research ArticleArticle

Bisphenol A Inhibits Voltage-activated Ca2+ channels In Vitro: Mechanisms and Structural Requirements

Andre Deutschmann, Michael Hans, Rainer Meyer, Hanns Haberlein and Dieter Swandulla
Molecular Pharmacology November 29, 2012, mol.112.081372; DOI: https://doi.org/10.1124/mol.112.081372
Andre Deutschmann
1 University of Bonn, Institute of Physiology;
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Michael Hans
1 University of Bonn, Institute of Physiology;
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Rainer Meyer
1 University of Bonn, Institute of Physiology;
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Hanns Haberlein
2 University of Bonn, Institute of Biochemisty and Molecular Biology
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Dieter Swandulla
1 University of Bonn, Institute of Physiology;
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Abstract

Bisphenol A (BPA), a high volume production chemical compound attracts growing attention as health relevant xenobiotic in humans. It can directly bind to hormone receptors, enzymes and ion channels to become biologically active. In this study we show that BPA acts as a potent blocker of voltage-activated Ca2+channels. We determined the mechanisms of block and the structural elements of BPA essential for its action. Macroscopic Ba2+/ Ca2+currents through native L-, N-, P/Q-, T-type Ca2+channels in rat endocrine GH3 cells, mouse DRG neurons or cardiac myocytes and recombinant human R-type Ca2+channels expressed in HEK293 cells were rapidly and reversibly inhibited by BPA with similar potency (EC50 values: 26 to 35 μM). Pharmacological and biophysical analysis of R-type Ca2+ channels revealed that BPA interacts with the extracellular part of the channel protein. Its action does not require intracellular signaling pathways, is neither voltage- nor use-dependent and does not affect channel gating. This indicates that BPA interacts with the channel in its resting state by directly binding to an external site outside the pore forming region. Structure-effect analyses of various phenolic and bisphenolic compounds revealed that (i) a double-alkylated (R-C(CH3)2-R, R-C(CH3)(CH2CH3)-R), or double-trifluoromethylated sp3 hybridized carbon atom between the two aromatic rings and (ii) the two aromatic moieties in angulated orientation are optimal for BPA's effectiveness. Since BPA highly pollutes the environment and is incorporated into the human organism our data may provide a basis for future studies relevant for human health and development.

  • Calcium channels
  • Structure-activity relationships and modeling
  • Patch clamp methods
  • Received July 26, 2012.
  • Revision received November 28, 2012.
  • Accepted November 29, 2012.
  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 103 (2)
Molecular Pharmacology
Vol. 103, Issue 2
1 Feb 2023
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Research ArticleArticle

Bisphenol A Inhibits Voltage-activated Ca2+ channels In Vitro: Mechanisms and Structural Requirements

Andre Deutschmann, Michael Hans, Rainer Meyer, Hanns Haberlein and Dieter Swandulla
Molecular Pharmacology November 29, 2012, mol.112.081372; DOI: https://doi.org/10.1124/mol.112.081372

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Research ArticleArticle

Bisphenol A Inhibits Voltage-activated Ca2+ channels In Vitro: Mechanisms and Structural Requirements

Andre Deutschmann, Michael Hans, Rainer Meyer, Hanns Haberlein and Dieter Swandulla
Molecular Pharmacology November 29, 2012, mol.112.081372; DOI: https://doi.org/10.1124/mol.112.081372
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