Characterization of binding sites for calcitonin gene related peptide in abalone gill
| Autor: | Evelyne Lopez, L Duvail, M Fouchereau–Peron |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Gills
chemistry.chemical_classification Binding Sites Physiology Calcitonin Gene-Related Peptide Cell Membrane Neuropeptide Peptide Metabolism Calcitonin gene-related peptide Biology Biochemistry Molecular biology Cellular and Molecular Neuroscience Endocrinology chemistry Mollusca Animals Humans Calcitonin binding Binding site Receptor Gene Receptors Calcitonin Gene-Related Peptide |
| Zdroj: | Peptides. 20:361-366 |
| ISSN: | 0196-9781 |
| DOI: | 10.1016/s0196-9781(99)00043-1 |
| Popis: | Target organs for calcitonin gene related peptide were investigated in the abalone. To elucidate the function of this neuropeptide in the biomineralization process, we have localized, in different tissues from abalone, specific binding sites for human calcitonin gene related peptide (hCGRP). Highest binding was observed in gill membranes where two classes of affinity components were identified. The affinity constants and the number of binding sites per mg of proteins for the site I were 5 × 10 9 M −1 and 8.8 × 10 10 . For the site II, the affinity constant was 1.34 × 10 7 M −1 and the number of binding sites per mg of proteins was 1.1 × 10 12 . In contrast, no specific calcitonin binding could be detected in every tested tissue, but the similar displacement of the 125 I-labeled CGRP binding with unlabeled hCGRP and sCT suggested that, in the abalone, the identified receptor could belong to a third class receptor subtype, that recognize both hCGRPα and sCT. These data suggest that, during evolution, the role of CGRP in gill function is particularly well conserved and that this neuropeptide is likely to participate in the control of hydromineral metabolism in aquatic species. |
| Databáze: | OpenAIRE |
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