Endomorphin-2: A biased agonist at the μ-opioid receptor

G. Rivero, J. Llorente, J. McPherson, A. Cooke, S.J. Mundell, C.A. McArdle, E.M. Rosethorne, S.J. Charlton, C. Krasel, C.P. Bailey, G. Henderson, E. Kelly

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Abstract

Previously we correlated the efficacy for G protein activation with that for arrestin recruitment for a number of agonists at the μ-opioid receptor (MOPr) stably expressed in HEK293 cells. We suggested that the endomorphins (endomorphin-1 and -2) might be biased toward arrestin recruitment. In the present study, we investigated this phenomenon in more detail for endomorphin-2, using endogenous MOPr in rat brain as well as MOPr stably expressed in HEK293 cells. For MOPr in neurons in brainstem locus ceruleus slices, the peptide agonists [D-Ala 2,N-Me-Phe 4,Gly 5-ol]-enkephalin (DAMGO) and endomorphin-2 activated inwardly rectifying K + current in a concentration-dependent manner. Analysis of these responses with the operational model of pharmacological agonism confirmed that endomorphin-2 had a much lower operational efficacy for G protein-mediated responses than did DAMGO at native MOPr in mature neurons. However, endomorphin-2 induced faster desensitization of the K + current than did DAMGO. In addition, in HEK293 cells stably expressing MOPr, the ability of endomorphin-2 to induce phosphorylation of Ser375 in the COOH terminus of the receptor, to induce association of arrestin with the receptor, and to induce cell surface loss of receptors was much more efficient than would be predicted from its efficacy for G protein-mediated signaling. Together, these results indicate that endomorphin-2 is an arrestin-biased agonist at MOPr and the reason for this is likely to be the ability of endomorphin-2 to induce greater phosphorylation of MOPr than would be expected from its ability to activate MOPr and to induce activation of G proteins. Copyright
Original languageEnglish
Pages (from-to)178-188
Number of pages11
JournalMolecular Pharmacology
Volume82
Issue number2
DOIs
Publication statusPublished - 2012

Fingerprint

mu Opioid Receptor
Arrestin
Ala(2)-MePhe(4)-Gly(5)-enkephalin
GTP-Binding Proteins
HEK293 Cells
glycyl-glycyl-glycyl-glycine
Phosphorylation
Neurons
Locus Coeruleus
endomorphin 2
Enkephalins
Cell Surface Receptors
Brain Stem
Pharmacology
Peptides
Brain

Cite this

Rivero, G., Llorente, J., McPherson, J., Cooke, A., Mundell, S. J., McArdle, C. A., ... Kelly, E. (2012). Endomorphin-2: A biased agonist at the μ-opioid receptor. Molecular Pharmacology, 82(2), 178-188. https://doi.org/10.1124/mol.112.078659

Endomorphin-2: A biased agonist at the μ-opioid receptor. / Rivero, G.; Llorente, J.; McPherson, J.; Cooke, A.; Mundell, S.J.; McArdle, C.A.; Rosethorne, E.M.; Charlton, S.J.; Krasel, C.; Bailey, C.P.; Henderson, G.; Kelly, E.

In: Molecular Pharmacology, Vol. 82, No. 2, 2012, p. 178-188.

Research output: Contribution to journalArticle

Rivero, G, Llorente, J, McPherson, J, Cooke, A, Mundell, SJ, McArdle, CA, Rosethorne, EM, Charlton, SJ, Krasel, C, Bailey, CP, Henderson, G & Kelly, E 2012, 'Endomorphin-2: A biased agonist at the μ-opioid receptor', Molecular Pharmacology, vol. 82, no. 2, pp. 178-188. https://doi.org/10.1124/mol.112.078659
Rivero G, Llorente J, McPherson J, Cooke A, Mundell SJ, McArdle CA et al. Endomorphin-2: A biased agonist at the μ-opioid receptor. Molecular Pharmacology. 2012;82(2):178-188. https://doi.org/10.1124/mol.112.078659
Rivero, G. ; Llorente, J. ; McPherson, J. ; Cooke, A. ; Mundell, S.J. ; McArdle, C.A. ; Rosethorne, E.M. ; Charlton, S.J. ; Krasel, C. ; Bailey, C.P. ; Henderson, G. ; Kelly, E. / Endomorphin-2: A biased agonist at the μ-opioid receptor. In: Molecular Pharmacology. 2012 ; Vol. 82, No. 2. pp. 178-188.
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AU - Llorente, J.

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AU - McArdle, C.A.

AU - Rosethorne, E.M.

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AU - Krasel, C.

AU - Bailey, C.P.

AU - Henderson, G.

AU - Kelly, E.

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AB - Previously we correlated the efficacy for G protein activation with that for arrestin recruitment for a number of agonists at the μ-opioid receptor (MOPr) stably expressed in HEK293 cells. We suggested that the endomorphins (endomorphin-1 and -2) might be biased toward arrestin recruitment. In the present study, we investigated this phenomenon in more detail for endomorphin-2, using endogenous MOPr in rat brain as well as MOPr stably expressed in HEK293 cells. For MOPr in neurons in brainstem locus ceruleus slices, the peptide agonists [D-Ala 2,N-Me-Phe 4,Gly 5-ol]-enkephalin (DAMGO) and endomorphin-2 activated inwardly rectifying K + current in a concentration-dependent manner. Analysis of these responses with the operational model of pharmacological agonism confirmed that endomorphin-2 had a much lower operational efficacy for G protein-mediated responses than did DAMGO at native MOPr in mature neurons. However, endomorphin-2 induced faster desensitization of the K + current than did DAMGO. In addition, in HEK293 cells stably expressing MOPr, the ability of endomorphin-2 to induce phosphorylation of Ser375 in the COOH terminus of the receptor, to induce association of arrestin with the receptor, and to induce cell surface loss of receptors was much more efficient than would be predicted from its efficacy for G protein-mediated signaling. Together, these results indicate that endomorphin-2 is an arrestin-biased agonist at MOPr and the reason for this is likely to be the ability of endomorphin-2 to induce greater phosphorylation of MOPr than would be expected from its ability to activate MOPr and to induce activation of G proteins. Copyright

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