Increased glycolysis mediates Wnt7b-induced bone formation

Area of Science:

• Bone Biology
• Metabolic Signaling
• Osteoporosis Research

Background:

• Wingless/integrated (Wnt) signaling is crucial for bone formation and a therapeutic target for osteoporosis.
• Downstream mechanisms of Wnt protein effects on bone are not fully understood.
• Increased glycolysis is linked to osteoblast differentiation, but direct genetic evidence is lacking.

Purpose of the Study:

• To investigate the role of glucose metabolism in Wnt-induced bone formation.
• To determine if Wingless/integrated (Wnt) family member 7B (Wnt7b) promotes bone formation via glucose metabolism.

Main Methods:

• Generated compound transgenic mice overexpressing Wnt7b with or without deleting glucose transporter 1 (Glut1).
• Assessed bone formation in mice and osteoblast differentiation in primary cell cultures.
• Measured Glut1 expression and glucose consumption in osteoblast lineage cells.

Main Results:

• Wnt7b overexpression significantly stimulated bone formation in mice.
• This bone-building effect was abolished in mice lacking Glut1.
• Wnt7b increased Glut1 expression and glucose uptake in osteoblasts, while Glut1 deletion impaired differentiation.

Conclusions:

• Wingless/integrated (Wnt) signaling promotes bone formation partly by enhancing glucose metabolism in osteoblast lineage cells.
• Glucose transporter 1 (Glut1) is essential for Wnt7b-mediated bone anabolism.
• Targeting glucose metabolism may offer new therapeutic strategies for osteoporosis.