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Molecular Pharmacology

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Research ArticleArticle

Interactions between the Mas-Related Receptors MrgD and MrgE Alter Signalling and Trafficking of MrgD

Sandra Milasta, John Pediani, Shirley Appelbe, Steven Trim, Michael Wyatt, Peter Cox, Mark Fidock and Graeme Milligan
Molecular Pharmacology February 2006, 69 (2) 479-491; DOI: https://doi.org/10.1124/mol.105.018788
Sandra Milasta
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John Pediani
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Shirley Appelbe
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Steven Trim
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Michael Wyatt
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Peter Cox
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Mark Fidock
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Graeme Milligan
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Abstract

When expressed via an inducible promoter in human embryonic kidney 293 cells, the rat Mas-related gene D (rMrgD) receptor responded to β-alanine but not l-alanine by elevating intracellular [Ca2+], stimulating phosphorylation of the mitogenactivated protein kinases known as extracellular signal-regulated kinase (ERK) 1 and ERK2 and translocating from the plasma membrane to punctate intracellular vesicles. By contrast, the related rat Mas-related gene E (rMrgE) receptor did not respond to β-alanine. Coexpression of rMrgD with rMrgE, which occurs in peripheral nociceptive neurons, allowed coimmunoprecipitation of the two receptors and resulted in the detection of cell surface rMrgD-rMrgE heterodimers via timeresolved fluorescence resonance energy transfer. These interactions increased the potency of β-alanine to phosphorylate ERK1 and ERK2 as well as maintaining the capacity of β-alanine to elevate intracellular [Ca2+], which was reduced in magnitude and slowed in response with increasing times of expression of rMrgD in isolation. Associated with these effects, the presence of rMrgE restricted β-alanine-induced internalization of rMrgD. This is the first report of heterodimeric interactions between members of the Mas-related gene (Mrg) receptor family and indicates that interactions between rMrgD and rMrgE modulate the function of rMrgD. Because the Mrg receptors are potential therapeutic targets in pain, these results suggest that efforts to understand the function and regulation of individual Mrg family receptors may require coexpression of relevant pairs.

  • Received September 8, 2005.
  • Accepted November 8, 2005.
  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 69 (2)
Molecular Pharmacology
Vol. 69, Issue 2
1 Feb 2006
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Research ArticleArticle

Interactions between the Mas-Related Receptors MrgD and MrgE Alter Signalling and Trafficking of MrgD

Sandra Milasta, John Pediani, Shirley Appelbe, Steven Trim, Michael Wyatt, Peter Cox, Mark Fidock and Graeme Milligan
Molecular Pharmacology February 1, 2006, 69 (2) 479-491; DOI: https://doi.org/10.1124/mol.105.018788

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Research ArticleArticle

Interactions between the Mas-Related Receptors MrgD and MrgE Alter Signalling and Trafficking of MrgD

Sandra Milasta, John Pediani, Shirley Appelbe, Steven Trim, Michael Wyatt, Peter Cox, Mark Fidock and Graeme Milligan
Molecular Pharmacology February 1, 2006, 69 (2) 479-491; DOI: https://doi.org/10.1124/mol.105.018788
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