Further insights into the insulin-like growth factor-I system of bony fish pituitary with special emphasis on reproductive phases and social status
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.
| Main Authors: | , , |
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| Format: | article biblioteca |
| Language: | eng |
| Subjects: | M12 - Production de l'aquaculture, L52 - Physiologie animale - Croissance et développement, L53 - Physiologie animale - Reproduction, poisson osseux, facteur de croissance igf, hypophyse, fsh, lh, développement biologique, somatotropine, reproduction sexuée, comportement, http://aims.fao.org/aos/agrovoc/c_1005, http://aims.fao.org/aos/agrovoc/c_34028, http://aims.fao.org/aos/agrovoc/c_5939, http://aims.fao.org/aos/agrovoc/c_3133, http://aims.fao.org/aos/agrovoc/c_4304, http://aims.fao.org/aos/agrovoc/c_921, http://aims.fao.org/aos/agrovoc/c_14422, http://aims.fao.org/aos/agrovoc/c_26876, http://aims.fao.org/aos/agrovoc/c_868, |
| Online Access: | http://agritrop.cirad.fr/549807/ http://agritrop.cirad.fr/549807/1/549807.pdf |
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