NPY Deficiency Prevents Postmenopausal Adiposity by Augmenting Estradiol-Mediated Browning

Area of Science:

• Endocrinology
• Metabolism
• Neuroscience

Background:

• Neuropeptide Y (NPY) is an orexigenic hormone crucial for peripheral fat metabolism regulation.
• The influence of sex on NPY's functional mechanisms remains incompletely understood.
• Investigating sex-specific effects of NPY is vital for understanding metabolic regulation.

Purpose of the Study:

• To investigate the effects of NPY deficiency on fat metabolism in male and female mice.
• To elucidate the underlying mechanisms of NPY's role in sex-dependent metabolic regulation.
• To explore NPY's potential as a therapeutic target for adiposity.

Main Methods:

• Comparative analysis of NPY-deficient (NPY-/-) and wild-type mice of both sexes.
• Assessment of body weight, white adipose tissue (WAT) mass, and thermogenic program activity.
• Evaluation of pituitary luteinizing hormone (LH) expression and inguinal WAT estradiol signaling.
• Analysis of age-related changes in adiposity.

Main Results:

• NPY deficiency led to decreased body weight and significantly reduced WAT mass in female mice, associated with upregulated thermogenesis.
• These metabolic alterations were not observed in NPY-deficient male mice.
• NPY deficiency increased pituitary LH expression and activated estradiol-mediated thermogenesis in female inguinal WAT.
• Age-related adiposity modifications were alleviated in female mice lacking NPY.

Conclusions:

• NPY deficiency reveals a novel intracellular mechanism influencing fat metabolism with significant sexual dimorphism.
• The findings highlight a distinct role for NPY in female metabolic regulation, involving LH and estradiol pathways.
• NPY's sexually dimorphic function presents a promising target for developing interventions against postmenopausal adiposity.