NPY signalling in early osteoblasts controls glucose homeostasis

Area of Science:

• Endocrinology
• Bone Biology
• Metabolic Regulation

Background:

• The skeleton's role in whole-body glucose metabolism is increasingly recognized.
• The precise mechanisms underlying bone's influence on glycaemic control remain unclear.

Purpose of the Study:

• To investigate the role of osteoblastic neuropeptide Y (NPY) Y1 receptor signaling in regulating glucose homeostasis.
• To elucidate the mechanism by which bone influences pancreatic function and insulin secretion.

Main Methods:

• Utilized genetically modified mice (Y1f3.6Cre) lacking NPY Y1 receptors in early osteoblasts.
• Assessed glucose homeostasis, pancreas parameters, and insulin tolerance.
• Performed bone marrow transplantation and high-fat diet studies.
• Analyzed conditioned media from osteoblast cultures for effects on insulin expression.

Main Results:

• Y1f3.6Cre mice exhibited high bone mass, impaired glucose tolerance, and reduced pancreatic insulin content.
• Bone marrow transplantation corrected glucose intolerance and bone mass in Y1f3.6Cre mice.
• Y1f3.6Cre mice showed improved glucose and insulin tolerance on a high-fat diet.
• Osteoblastic cultures from Y1f3.6Cre mice failed to stimulate insulin expression in MIN6 cells.

Conclusions:

• Osteoblast-derived factors, regulated by NPY Y1 signaling, influence pancreatic function.
• This study identifies a novel mechanism linking bone tissue to pancreatic function and glucose homeostasis.