Neuropeptide Y increases food intake in mice

Area of Science:

• Neuroscience
• Endocrinology
• Behavioral Science

Background:

• Neuropeptide Y (NPY) is known to stimulate feeding behaviors across various species.
• Understanding the precise role of NPY in appetite regulation is crucial for metabolic research.

Purpose of the Study:

• To investigate the effects of Neuropeptide Y (NPY) on feeding and drinking behaviors in mice.
• To assess NPY's efficacy in diverse physiological states, including genetic obesity and diabetes, and across different age groups.

Main Methods:

• Intracerebroventricular administration of porcine and human Neuropeptide Y (NPY) in mice.
• Behavioral analysis to quantify eating latency, duration, grooming, and water intake.
• Testing NPY efficacy in genetically obese (ob/ob), diabetic (db/db), streptozocin-induced diabetic mice, and aged mice.

Main Results:

• Intracerebroventricular NPY administration significantly increased food intake and decreased latency to eat in mice.
• NPY enhanced water intake in the presence of food but suppressed it in its absence.
• NPY's food intake-stimulating effect was consistent across genetically obese, diabetic, and aged mouse models compared to their respective controls.
• Human NPY increased food intake, while its free acid form was inactive.

Conclusions:

• Neuropeptide Y (NPY) is a potent stimulator of feeding behavior in mice, affecting latency, duration, and grooming.
• NPY's orexigenic effects are robust and consistent across various models of metabolic dysfunction and aging.
• These findings highlight NPY as a key regulator of appetite with potential therapeutic implications for eating disorders and metabolic diseases.