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• W2020145004 abstract "This study presents a direct comparison of the ligand binding and signaling profiles of a mammalian and non-mammalian mu opioid receptor. Opioid ligand binding and agonist potencies were determined for an amphibian (Rana pipiens) mu opioid receptor (rpMOR) and the human mu opioid receptor (hMOR) in transfected, intact Chinese hamster ovary (CHO) cells. Identical conditions were employed such that statistically meaningful differences between the two receptors could be determined. Identifying these differences is an important first step in understanding how evolutionary changes affect ligand binding and signaling in vertebrate opioid receptors. As expected, the rank of opioid ligand affinity for rpMOR and hMOR was consistent with the ligands' previously characterized type-selectivity. However, most of the opioid ligands tested had significant differences in affinity for rpMOR and hMOR. For example, the mu-selective agonist, DAMGO ([d-Ala2, N-Me-Phe4, Gly5-ol]-enkephalin), had a 10.9-fold greater affinity (Ki) for hMOR (Ki = 268 nM) than rpMOR (Ki = 2914 nM). In addition, differences in signaling between these receptors were found by measuring inhibition of cAMP accumulation by morphine or DAMGO. DAMGO was significantly more potent (13.6-fold) in CHO cells expressing hMOR versus those expressing rpMOR. In addition, a significantly greater maximal inhibition was elicited by both opioid agonists in cells expressing hMOR. In summary, this study supports an ongoing effort to better understand how vertebrate evolution has shaped opioid receptor properties and function." @default.
• W2020145004 created "2016-06-24" @default.
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• W2020145004 date "2008-12-01" @default.
• W2020145004 modified "2023-09-28" @default.
• W2020145004 title "A pharmacological comparison of the cloned frog and human mu opioid receptors reveals differences in opioid affinity and function" @default.
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• W2020145004 doi "https://doi.org/10.1016/j.ejphar.2008.09.043" @default.
• W2020145004 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2600596" @default.
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