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  • Title: Transitory coexistence of oxytocin and vasopressin in the hypothalamo neurohypophysial system of parturient rats.
    Author: Jirikowski GF, Ramalho-Ortigao FJ, Caldwell JD.
    Journal: Horm Metab Res; 1991 Oct; 23(10):476-80. PubMed ID: 1761278.
    Abstract:
    We used in situ hybridization and immunocytochemistry to investigate a possible coexistence of vasopressin and oxytocin in hypothalamic neurons of parturient rats. We found that a fraction of magnocellular neurons in the paraventricular and supraoptic nuclei contained immunostaining for both peptides as well as oxytocin and vasopressin mRNA hybridization. Colocalization of immunoreactive vasopressin and oxytocin could be observed in some of the Herring bodies in the median eminence and the posterior lobe. No coexistence of vasopressin and oxytocin was found in pregnant or in lactating animals, indicating that the observed coexistence is transitory, perhaps mediated through changing hormonal conditions peri partum.
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