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  • Title: Chemical identification of the mammalian oxytocin in a holocephalian fish, the ratfish (Hydrolagus colliei).
    Author: Michel G, Chauvet J, Chauvet MT, Clarke C, Bern H, Acher R.
    Journal: Gen Comp Endocrinol; 1993 Nov; 92(2):260-8. PubMed ID: 8282175.
    Abstract:
    The neurohypophysial hormones of the ratfish (Hydrolagus colliei), a species belonging to the subclass Holocephali of cartilaginous fishes, have been investigated. An oxytocin-like hormone has been isolated from acetone-desiccated pituitary glands by using successively molecular sieving and high-pressure liquid chromatography. The peptide has been identified as oxytocin by coelution with synthetic oxytocin in HPLC, amino acid sequencing, mass spectrometry, and C-terminal sequencing through carboxypeptidase Y. Vasotocin may be present in a very small amount. Cartilaginous fishes appear to display a great diversity in their oxytocin-like hormones since five different peptides have been identified in rays and sharks that belong to the second subclass Selachii.
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