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The developing pituitary is a rapidly changing environment that is constantly meeting the physiological demands of the growing organism. During early postnatal development, the anterior pituitary is refining patterns of anterior hormone secretion in response to numerous genetic factors. Our lab previously developed a somatotrope leptin receptor LEPR deletion mouse model that had decreased lean body mass, disrupted metabolism, decreased GH stores and was GH deficient as an adult. There were no differences in weight between groups, and the postnatal leptin surge appeared to be normal. These studies show that the dysfunction caused by LEPR deletion in somatotropes begins as early as neonatal development and involves developing GH and prolactin cells somatolactotropes. The morphogenesis of the murine pituitary is initiated by neurulation and continues throughout embryonic development where it is under the influence of numerous critically timed signaling pathways that lead to the differentiation and proliferation of the individual endocrine cell populations Rizzoti
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Sex-specific changes in postnatal GH and PRL secretion in somatotrope LEPR-null mice

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Short-term fasting abolishes the sex-related difference in GH and leptin secretion in humans

The morphogenesis of the murine pituitary is initiated by neurulation and continues throughout embryonic development where it is under the influence of numerous critically timed signaling pathways that lead to the differentiation and proliferation of the individual endocrine cell populations Rizzoti The earliest exclusive pituitary marker is PROP1 , a paired homeodomain transcription factor, which is expressed at embryonic day 10 E10 in the mouse. On E Postnatal expression of Pou1f1 is maintained for the expansion and survival of these cell types and to regulate the expression of hormones and hypothalamic peptide receptors Olson et al. Of these Pou1f1 lineage cell types, somatotropes are the most abundant and are vital for optimized growth and body composition throughout life Childs , Akhter et al. Most somatotropes express leptin receptors LEPR , and the importance of leptin regulation in these cells was emphasized recently when the signaling component of LEPR Childs et al. Indirect calorimetry showed that these mice predominantly oxidized carbohydrates and had disrupted sleep and decreased activity Akhter et al.
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Short-term fasting abolishes the sex-related difference in GH and leptin secretion in humans

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