High-Fat Diet Increases Bone Loss by Inducing Ferroptosis in Osteoblasts

Area of Science:

• Biomedical Science
• Cell Biology
• Bone Metabolism

Background:

• Chronic high-fat diet intake is linked to adult bone loss, but the underlying mechanisms remain unclear.
• High-fat diets are associated with ferroptosis, a form of regulated cell death.
• This study investigates if ferroptosis mediates high-fat diet-induced bone loss.

Purpose of the Study:

• To determine the role of ferroptosis in high-fat diet-induced bone loss.
• To assess the effect of ferroptosis inhibition on bone loss in mice fed a high-fat diet.
• To examine the impact of high-fat conditions on osteoblast function in vitro.

Main Methods:

• Mice were divided into high-fat diet, high-fat diet + ferroptosis inhibitor (Fer-1), and normal chow groups for 12 weeks.
• Microscopic CT scans, histological tests, and ferroptosis biochemical assays were performed on bone tissue.
• Mc3t3-E1 cells were cultured in high-fat medium with or without Fer-1 to assess osteoblast proliferation and differentiation.

Main Results:

• High-fat diet induced femoral bone loss in mice, which was ameliorated by ferroptosis inhibitors.
• The high-fat diet primarily reduced osteoblast numbers in the bone marrow cavity.
• In vitro, high-fat conditions inhibited osteoblast proliferation and differentiation, with altered ferroptosis markers.

Conclusions:

• Ferroptosis is a key mediator of high-fat diet-induced bone loss.
• Ferroptosis inhibitors show potential for treating bone loss associated with high-fat diets.
• Targeting ferroptosis pathways may offer new therapeutic avenues for osteoporosis prevention and treatment.