ZFIN ID: ZDB-PUB-190627-11
Hyperandrogenism in POMCa-deficient zebrafish enhances somatic growth without increasing adiposity
Shi, C., Lu, Y., Zhai, G., Huang, J., Shang, G., Lou, Q., Li, D., Jin, X., He, J., Du, Z., Gui, J., Yin, Z.
Date: 2019
Source: Journal of molecular cell biology   12(4): 291-304 (Journal)
Registered Authors: Du, Zhen-Yu, Gui, Jian-Fang, He, Jiangyan, Li, Dong-Liang, Yin, Zhan
Keywords: pomca, HPI axis, anabolic metabolism, somatic growth, stress response
MeSH Terms:
  • Adiposity*
  • Adrenocorticotropic Hormone/metabolism
  • Animals
  • Anxiety/metabolism
  • Base Sequence
  • Behavior, Animal
  • Cyclic AMP/metabolism
  • Darkness
  • Fatty Acids/metabolism
  • Hydrocortisone/metabolism
  • Hyperandrogenism/metabolism*
  • Larva/metabolism
  • Lipids/chemistry
  • Melanosomes/metabolism
  • Muscles/metabolism
  • Mutation/genetics
  • Obesity/genetics
  • Oxidation-Reduction
  • Oxygen Consumption
  • Pro-Opiomelanocortin/deficiency*
  • Pro-Opiomelanocortin/metabolism
  • Protein Biosynthesis
  • Receptor, Melanocortin, Type 2/metabolism
  • Signal Transduction
  • Testosterone/metabolism
  • Zebrafish/growth & development*
  • Zebrafish/metabolism*
PubMed: 31237951 Full text @ J. Mol. Cell Biol.
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ABSTRACT
The endocrine regulatory roles of the hypothalamic-pituitary-adrenocortical (HPA) axis on anxiety-like behavior and metabolic status have been found throughout animal taxa. However, the precise effects of the balancing adrenal corticosteroid biosynthesis under the influence of adrenocorticotrophic hormone (ACTH), a pro-opiomelanocortin (POMC)-derived peptide, on animal energy expenditure and somatic growth remain unknown. POMC has also been identified as one of the candidate loci for polycystic ovary syndrome (PCOS) which features hyperandrogenism and some prevalence of obesity in patients. Here we show that zebrafish lacking functional POMCa exhibit similar phenotypes of stress response and body weight gain but not obesity as observed in mammalian models. In contrast with the impaired anorexigenic signaling cascade of melanocyte-stimulating hormones (MSHs) and leptin, which are responsible for their obesity-prone weight gain observed in various pomc mutant mammals, analyses with our pomca mutant series indicate that ACTH is the key regulator for the phenotype with enhanced somatic growth without obesity in pomca-deficient zebrafish. Hypocortisolism associated with hyperandrogenism has been observed in the pomca-deficient zebrafish, with enhanced activation of mTORC1, reutilization of amino acids and fatty acid β-oxidation are observed in the muscle tissue of the pomca-deficient fish. After reducing hyperandrogenism by crossing our pomca mutant fish with a cyp17a1-deficient background, the phenotype of enhanced somatic growth in pomca-deficient fish was no longer observed. Thus, our work also demonstrated that the role of POMCa in stress response seems to be conserved in vertebrates, whereas its effect on adipostasis is unique to teleosts.
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