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Sex-Specific Role of NPVF Signalling in Homeostatic Control.

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Neuropeptide VF (NPVF) regulates energy and glucose balance, with its absence impacting female water intake and bone density. Sex differences in metabolism are evident, especially under high-fat diets.

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Area of Science:

  • Metabolic regulation
  • Neuroendocrinology
  • Mammalian physiology

Background:

  • Neuropeptide VF (NPVF) is implicated in homeostatic regulations, but direct evidence is limited.
  • RFamide peptides play roles in physiological control.
  • Understanding NPVF's function requires in vivo investigation.

Purpose of the Study:

  • To investigate the role of NPVF in energy and glucose homeostasis.
  • To characterize a NPVF knockout mouse model.
  • To identify sex-specific metabolic effects of NPVF deficiency.

Main Methods:

  • Generation of a NPVF knockout mouse model (Npvf-/-).
  • Assessment of metabolic parameters at room temperature (RT) and thermoneutrality (TN).
  • Evaluation under standard chow and high-fat diet (HFD) conditions.
  • Analysis of body weight, composition, water intake, bone mineral content, adiposity, glucose tolerance, and insulin action.

Main Results:

  • Female Npvf-/- mice showed reduced water intake and altered bone/adiposity, while males were largely unaffected on chow.
  • Npvf deletion caused hyperphagia and weight gain in both sexes on HFD, masking sex differences.
  • Glucose tolerance and insulin action showed complex sex- and condition-dependent changes, with improved insulin sensitivity in females at TN and impaired action in males at TN on HFD.

Conclusions:

  • NPVF is a critical regulator of energy and glucose metabolism.
  • Metabolic regulation by NPVF exhibits significant sex dimorphism.
  • The effects of NPVF deficiency are modulated by environmental (temperature) and nutritional (diet) factors.