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  • Title: [Effects of leucine-enkephalin and methionine-enkephalin on prolactin and gonadotropin secretion and synthesis in vitro].
    Author: Demoulin A, Hazee-Hagelstein MT, Renard C, Franchimont P.
    Journal: C R Seances Soc Biol Fil; 1980; 174(2):211-5. PubMed ID: 6446966.
    Abstract:
    In vivo, Enkephalins, stimulate PRL, inhibit LH and are inactive on FSH. However, in monolayer pituitary cell cultures, PRL, LH and FSH secretions and synthesis are not modified by Met-Enk. (5 microgram/ml) or Leu-Enk. (5 and 10 microgram/ml). But the simultaneous presence of LHRH and Enk. induces an increase in LH secretion and synthesis without modifying FSH and PRL. In conclusion 1) Enk do not act by themself at the pituitary level but 2) they are able to modify the responses induced by hypothalamic hormones.
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