Receptor Activity Modifying Proteins (RAMPs) interact with the VPAC2 Receptor and CRF1 receptors and modulate their function

D. Wootten, H. Lindmark, M. Kadmiel, H. Willcockson, K.M. Caron, J. Barwell, T. Drmota, D. Poyner

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Background and Purpose Although it is established that the receptor activity modifying proteins (RAMPs) can interact with a number of GPCRs, little is known about the consequences of these interactions. Here the interaction of RAMPs with the glucagon-like peptide 1 receptor (GLP-1 receptor), the human vasoactive intestinal polypeptide/pituitary AC-Activating peptide 2 receptor (VPAC) and the type 1 corticotrophin releasing factor receptor (CRF) has been examined. Experimental Approach GPCRs were co-transfected with RAMPs in HEK 293S and CHO-K1 cells. Cell surface expression of RAMPs and GPCRs was examined by elisa. Where there was evidence for interactions, agonist-stimulated cAMP production, Ca mobilization and GTPγS binding to G, G, G and G were examined. The ability of CRF to stimulate adrenal corticotrophic hormone release in Ramp2 mice was assessed. Key Results The GLP-1 receptor failed to enhance the cell surface expression of any RAMP. VPAC enhanced the cell surface expression of all three RAMPs. CRF enhanced the cell surface expression of RAMP2; the cell surface expression of CRF was also increased. There was no effect on agonist-stimulated cAMP production. However, there was enhanced G-protein coupling in a receptor and agonist-dependent manner. The CRF: RAMP2 complex resulted in enhanced elevation of intracellular calcium to CRF and urocortin 1 but not sauvagine. In Ramp2 mice, there was a loss of responsiveness to CRF. Conclusions and Implications The VPAC and CRF receptors interact with RAMPs. This modulates G-protein coupling in an agonist-specific manner. For CRF, coupling to RAMP2 may be of physiological significance. © 2012 The Authors. British Journal of Pharmacology © 2012 The British Pharmacological Society.
Original languageEnglish
Pages (from-to)822-834
Number of pages13
JournalBritish Journal of Pharmacology
Issue number4
Early online date5 Sept 2012
Publication statusPublished - Feb 2013


  • receptor activity-modifying proteins
  • RAMP1
  • RAMP2
  • RAMP3
  • VPAC2 receptor
  • CRF1 receptor
  • Ramp2+/- mice
  • G-protein coupling
  • biased agonism


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