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• W2150422480 abstract "The galanin neuropeptide system is widely distributed throughout the brain and periphery and is thought to play a role in feeding, pain and reproduction. To evaluate the human galanin receptor 1 as a potential therapeutic target, we fully characterized its interaction with several galanin-like peptides. The human galanin receptor 1 receptor was stably expressed using an episomal system in human embryonic kidney 293E cells. Saturation isotherms using 125I-human galanin revealed two distinct populations of receptor affinity states in membranes and whole cells with picomolar and nanomolar affinities at the high- and low affinity states, respectively. A scintillation proximity assay revealed that 125I-human galanin binding in membranes reached steady-state within 2 to 2.5 hr; however, only 50% of galanin radiolabel dissociated from the receptors by excess galanin or guanosine 5'-O-3-thiotriphosphate even after 20 hr. In contrast, galanin binding in whole cells was completely reversible within 1 hr. Competition binding assays showed that galanin-like peptides bound with picomolar affinities in membranes and whole cells. These peptides behaved as full agonists as determined by the inhibition of forskolin-stimulated cyclic 3'5'-adenosine monophosphate production and the stimulation of guanosine 5'-O-(3-[35S]thiotriphosphate binding. The agonist profile of M40, a representative chimeric peptide, was found not to be the result of receptor reserve because receptor inactivation by partial alkylation experiments confirmed its full intrinsic efficacy under conditions of a zero reserve state. These observations suggest that the antagonist effects in vivo of M40, and perhaps other chimeric peptides, are not mediated via direct interactions with the galanin receptor 1 receptor." @default.
• W2150422480 created "2016-06-24" @default.
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• W2150422480 date "1998-11-01" @default.
• W2150422480 modified "2023-09-23" @default.
• W2150422480 title "Pharmacological and biochemical characterization of a recombinant human galanin GALR1 receptor: agonist character of chimeric galanin peptides." @default.
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• W2150422480 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9808667" @default.
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