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Sundström G, Larsson TA, Xu B, et al. Interactions of zebrafish peptide YYb with the neuropeptide Y-family receptors Y4, Y7, Y8a, and Y8b. Front Neurosci. 2013;7:29doi: 10.3389/fnins.2013.00029.
Sundström, G., Larsson, T. A., Xu, B., Heldin, J., & Larhammar, D. (2013). Interactions of zebrafish peptide YYb with the neuropeptide Y-family receptors Y4, Y7, Y8a, and Y8b. Frontiers in neuroscience, 729. https://doi.org/10.3389/fnins.2013.00029
Sundström, Görel, et al. "Interactions of zebrafish peptide YYb with the neuropeptide Y-family receptors Y4, Y7, Y8a, and Y8b." Frontiers in neuroscience vol. 7 (2013): 29. doi: https://doi.org/10.3389/fnins.2013.00029
Sundström G, Larsson TA, Xu B, Heldin J, Larhammar D. Interactions of zebrafish peptide YYb with the neuropeptide Y-family receptors Y4, Y7, Y8a, and Y8b. Front Neurosci. 2013 Mar 15;7:29. doi: 10.3389/fnins.2013.00029. eCollection 2013. PMID: 23508731; PMCID: PMC3598007.
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Front Neurosci. 2013 Mar 15;7:29. doi: 10.3389/fnins.2013.00029. eCollection 2013.

Interactions of zebrafish peptide YYb with the neuropeptide Y-family receptors Y4, Y7, Y8a, and Y8b.

Frontiers in neuroscience

Görel Sundström, Tomas A Larsson, Bo Xu, Johan Heldin, Dan Larhammar

Affiliations

  1. Department of Neuroscience, Uppsala University Uppsala, Sweden.

PMID: 23508731 PMCID: PMC3598007 DOI: 10.3389/fnins.2013.00029

Abstract

The neuropeptide Y (NPY) system influences numerous physiological functions including feeding behavior, endocrine regulation, and cardiovascular regulation. In jawed vertebrates it consists of 3-4 peptides and 4-7 receptors. Teleost fishes have unique duplicates of NPY and PYY as well as the Y8 receptor. In the zebrafish, the NPY system consists of the peptides NPYa, PYYa, and PYYb (NPYb appears to have been lost) and at least seven NPY receptors: Y1, Y2, Y2-2, Y4, Y7, Y8a, and Y8b. Previously PYYb binding has been reported for Y2 and Y2-2. To search for peptide-receptor preferences, we have investigated PYYb binding to four of the remaining receptors and compared with NPYa and PYYa. Taken together, the most striking observations are that PYYa displays reduced affinity for Y2 (3 nM) compared to the other peptides and receptors and that all three peptides have higher affinity for Y4 (0.028-0.034 nM) than for the other five receptors. The strongest peptide preference by any receptor selectivity is the one previously reported for PYYb by the Y2 receptor, as compared to NPY and PYYa. These affinity differences may be helpful to elucidate specific details of peptide-receptor interactions. Also, we have investigated the level of mRNA expression in different organs using qPCR. All peptides and receptors have higher expression in heart, kidney, and brain. These quantitative aspects on receptor affinities and mRNA distribution help provide a more complete picture of the NPY system.

Keywords: G-protein-coupled receptor; NPY; PYY; evolution; zebrafish

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