Postnatal leptin is necessary for maturation of numerous organs in newborn rats
2011
Attig, Linda, L. | Larcher, Thibaut, T. | Gertler, Arieh | Abdennebi- Najar, Latifa | Djiane, Jean | Neurobiologie de l'Olfaction et Modélisation en Imagerie (NOeMI) ; Institut National de la Recherche Agronomique (INRA) | Développement et Pathologie du Tissu Musculaire (DPTM) ; Institut National de la Recherche Agronomique (INRA)-École nationale vétérinaire, agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS) | The Hebrew University of Jerusalem (HUJ) | Institut Polytechnique LaSalle Beauvais
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Afficher plus [+] Moins [-]anglais. The postnatal leptin surge, described particularly in rodents, has been demonstrated to be crucial for hypothalamic maturation and brain development. In the present study, the possible general effects of this hormone on maturation of numerous peripheral organs have been explored. To test this hypothesis, we used a leptin antagonist (L39A/D40A/F41A) to investigate the effects of the blockage of postnatal leptin action on neonatal growth and maturation of organs involved in metabolism regulation, reproduction and immunity. For that purpose, newborn female pups were subcutaneously injected from days 2-13 with either saline or leptin antagonist and sacrificed at weaning. Organs were submitted to histological and immunohistochemical analyses. Leptin antagonist treatment clearly impaired the maturation of pancreas, kidney, thymus and ovary. All these alterations, at the organ level, occurred without changes in the whole-body mass of the animals. Leptin antagonist treatment induced: (1) a reduction in beta cell area and a concomitant increase of a cells in Langherans islets in the pancreas, (2) a reduction in the number of glomeruli and a persistence of immature glomeruli in kidney, (3) an increase in the thymic cortical layer thickness, reflecting an unmatured stage, (4) a drastic reduction of the pool of primordial follicles, in ovaries. All these results strongly argue for a crucial role of leptin for the achievement of organ maturation, opening new perspectives in the field of leptin physiology and organ development.
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