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Further insights into the insulin-like growth factor-I system of bony fish pituitary with special emphasis on reproductive phases and social status

Shved N., Baroiller J.F., Eppler E.. 2009. Annals of the New York Academy of Sciences, 1163 : p. 517-520. Conference of European Comparative Endocrinologists (CECE). 24, 2008-09-02/2008-09-06, Gênes (Italie).

DOI: 10.1111/j.1749-6632.2008.03632.x

Insulin-like growth factor (IGF)-I, which is crucially involved in fish growth, differentiation, and reproduction, occurs in tilapia pituitary. IGF-I peptide, which is probably produced in hypothalamic perikarya, is present in axons of the neurohypophysis, and IGF-I mRNA and peptide are present in the adenohypophysis in adrenocorticotrophic hormone cells,melanocyte-stimulating hormone cells, with interindividual differences in growth hormone cells, and, starting with puberty, in gonadotrophic hormone (GTH) cells. Subordinate males showed a high IGF-I but a lower ^-luteinizing hormone expression, while in dominant males the opposite was found. IGF-I from the GTH cells may act as auto/paracrine regulators of GTH cell proliferation and enhance GTH synthesis and release during puberty and reproduction, depending on the social status.

Mots-clés : poisson osseux; facteur de croissance igf; hypophyse; fsh; lh; développement biologique; somatotropine; reproduction sexuée; comportement

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