Journal
TRENDS IN COMPARATIVE ENDOCRINOLOGY AND NEUROBIOLOGY
Volume 1163, Issue -, Pages 517-520Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1749-6632.2008.03632.x
Keywords
growth hormone; FSH; LH; IGF-I; hypophysis; feedback; behavior; development; reproduction; teleost
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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 P-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.
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