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http://dx.doi.org/10.5352/JLS.2018.28.3.284

Characterization of Melanin-concentrating Hormone from Olive Flounder (Paralichthys olivaceus)  

Chung, In Young (Department of Microbiology, Pukyong National University)
Jeon, Jeong Min (Department of marine Biology, Pukyong National University)
Song, Young Hwan (Department of Microbiology, Pukyong National University)
Publication Information
Journal of Life Science / v.28, no.3, 2018 , pp. 284-292 More about this Journal
Abstract
The melanin-concentrating hormone (MCH), a cyclic hypothalamic peptide composed of 17 amino acids, was initially identified in chum salmon (Oncorhynchus keta) as a regulator of pigmentation. Mammalian MCHs are cyclic hypothalamic peptides composed of 19 amino acids that regulate food intake and energy homeostasis. The present study examined not only MCH expression of different tissues but also the melanohore aggregation and intracellular $Ca^{2+}$ influx of fMCH and the other MCH. Real-time qPCR showed that MCH expressed specially in the brain, gonad, and ovary, and expression of MCH was observed during the developmental stages. In the application of synthetic fMCH and both types of synthetic fMCH, dN-fMCH and dC-fMCH, scale melanophore induced significant changes in aggregation activity with various concentrations of MCH. Also, compared to hMCH and sMCH, fMCH exhibited a 36~99.85% increase in relative potency (%), whereas aggregation of dN-fMCH and dC-fMCH remained in a high concentration. However, dispersion was induced rapidly according to be low concentration of dN-fMCH and dC-fMCH. We show that fMCH and its derivates were bound human MCHR1 and rat MCHR expressed in HEK293T cells with nano-molar affinity and are likely to be ligand-induced to mobilize intracellular $Ca^{2+}$. These results may provide new ligands for binding assay with MCHew ligands, as a structure similar to the mammalian MCH structure was discovered in fish. Once the fMCH receptor system is in place, it can be compared to the MCH system of mammals in terms of MCH function.
Keywords
Fluorescent imaging plate reader; melanin-concentrating hormone; melanin-concentrating hormone receptor; Paralichthys olivaceus; quantitative real-time PCR;
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