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Molecular Pharmacology

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Research ArticleArticle

Allosteric Activation of the Ca2+ Receptor Expressed in Xenopus laevis Oocytes by NPS 467 or NPS 568

Lance G. Hammerland, James E. Garrett, Benjamin C. P. Hung, Cynthia Levinthal and Edward F. Nemeth
Molecular Pharmacology June 1998, 53 (6) 1083-1088;
Lance G. Hammerland
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James E. Garrett
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Benjamin C. P. Hung
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Cynthia Levinthal
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Edward F. Nemeth
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Abstract

The Ca2+ receptor is a G protein-coupled receptor that enables parathyroid cells and certain other cells in the body to respond to changes in the concentration of extracellular Ca2+. In this study, two novel phenylalkylamine compounds, NPS 467 and NPS 568, were examined for effects on Xenopus laevis oocytes expressing the bovine or human parathyroid Ca2+ receptors. Increases in chloride current (ICl) were elicited in oocytes expressing the bovine Ca2+ receptor when the extracellular Ca2+concentration was raised above 1.5 mm, whereas Ca2+ concentrations > 3 mm were generally necessary to elicit responses in oocytes expressing the human Ca2+ receptor. NPS 467 and NPS 568 potentiated the activation of ICl by extracellular Ca2+ in oocytes expressing either Ca2+ receptor homolog, and this resulted in a leftward shift of the Ca2+concentration-response curve. Neither compound was active in the absence of extracellular Ca2+. Certain inorganic and organic cations known to activate the Ca2+ receptor were substituted for elevated levels of extracellular Ca2+ to increase ICl and the effects of these agonists were also potentiated by NPS 568 or NPS 467. The effects of NPS 568 were stereoselective and the R-enantiomer was about 10-fold more potent than the corresponding S-enantiomer. Neither NPS 467 nor 568 affected ICl in water-injected oocytes or in oocytes expressing the substance K receptor or the metabotropic glutamate receptor 1a. These results provide compelling evidence that NPS 467 and NPS 568 act directly upon the parathyroid Ca2+receptor to increase its sensitivity to activation by extracellular Ca2+. This activity suggests that these compounds are positive allosteric modulators of the Ca2+ receptor. As such, these compounds define a new class of pharmacological agents with potent and selective actions on the Ca2+ receptor.

Footnotes

  • Send reprint requests to: Lance Hammerland, Ph.D., NPS Pharmaceuticals, Inc., 420 Chipeta Way, Salt Lake City, UT 84108. E-mail: lhammerland{at}npsp.com

  • Abbreviations:
    PTH
    parathyroid hormone
    BoPCaR
    bovine parathyroid Ca2+ receptor
    hPCaR
    human parathyroid Ca2+ receptor
    SKR
    substance K receptor
    mGluR
    metabotropic glutamate receptor
    MBS
    modified Barth’s solution
    HEPES
    4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid
    ICl
    chloride current
    • Received November 6, 1997.
    • Accepted February 13, 1998.
  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 53 (6)
Molecular Pharmacology
Vol. 53, Issue 6
1 Jun 1998
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Research ArticleArticle

Allosteric Activation of the Ca2+ Receptor Expressed in Xenopus laevis Oocytes by NPS 467 or NPS 568

Lance G. Hammerland, James E. Garrett, Benjamin C. P. Hung, Cynthia Levinthal and Edward F. Nemeth
Molecular Pharmacology June 1, 1998, 53 (6) 1083-1088;

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Research ArticleArticle

Allosteric Activation of the Ca2+ Receptor Expressed in Xenopus laevis Oocytes by NPS 467 or NPS 568

Lance G. Hammerland, James E. Garrett, Benjamin C. P. Hung, Cynthia Levinthal and Edward F. Nemeth
Molecular Pharmacology June 1, 1998, 53 (6) 1083-1088;
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