Ghrelin Gene Deletion Alters Pulsatile Growth Hormone Secretion in Adult Female Mice

Using preproghrelin-deficient mice ( ), we previously observed that preproghrelin modulates pulsatile growth hormone (GH) secretion in post-pubertal male mice. However, the role of ghrelin and its derived peptides in the regulation of growth parameters or feeding in females is unknown. We measured p...

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Published in:Frontiers in endocrinology (Lausanne) 2021-10, Vol.12, p.754522
Main Authors: Hassouna, Rim, Fernandez, Gimena, Lebrun, Nicolas, Fiquet, Oriane, Roelfsema, Ferdinand, Labarthe, Alexandra, Zizzari, Philippe, Tomasetto, Catherine, Epelbaum, Jacques, Viltart, Odile, Chauveau, Christophe, Perello, Mario, Tolle, Virginie
Format: Article
Language:English
Subjects:
Animals
Arcuate Nucleus of Hypothalamus - cytology
Endocrinology
Feeding Behavior
Female
food intake
Gene Deletion
ghrelin
Ghrelin - physiology
growth hormone
Growth Hormone - metabolism
Life Sciences
Male
Mice
Mice, Inbred C57BL
Pituitary Gland - metabolism
pulsatility
Sex Characteristics
sexual dimorphism
Ultradian Rhythm
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Summary:Using preproghrelin-deficient mice ( ), we previously observed that preproghrelin modulates pulsatile growth hormone (GH) secretion in post-pubertal male mice. However, the role of ghrelin and its derived peptides in the regulation of growth parameters or feeding in females is unknown. We measured pulsatile GH secretion, growth, metabolic parameters and feeding behavior in adult and male and female mice. We also assessed GH release from pituitary explants and hypothalamic growth hormone-releasing hormone (GHRH) expression and immunoreactivity. Body weight and body fat mass, linear growth, spontaneous food intake and food intake following a 48-h fast, GH pituitary contents and GH release from pituitary explants , fasting glucose and glucose tolerance were not different among adult and male or female mice. , pulsatile GH secretion was decreased, while approximate entropy, that quantified orderliness of secretion, was increased in adult females only, defining more irregular GH pattern. The number of neurons immunoreactive for GHRH visualized in the hypothalamic arcuate nucleus was increased in adult females, as compared to females, whereas the expression of GHRH was not different amongst groups. Thus, these results point to sex-specific effects of preproghrelin gene deletion on pulsatile GH secretion, but not feeding, growth or metabolic parameters, in adult mice.
ISSN:1664-2392
1664-2392
DOI:10.3389/fendo.2021.754522