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Glucose restriction regulates osteoblasts function by modulating mitochondrial activity and lipolysis.

Ciro Menale1, Concetta Sozio1, Giuliana La Rosa1

  • 1Department of Clinical Medicine and Surgery, University of Naples "Federico II", Naples, Italy.

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Glucose restriction enhances osteogenesis by promoting lipid utilization in osteoblasts. This metabolic shift supports bone cell function during low glucose conditions, crucial for conditions like diabetes.

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Area of Science:

  • Bone biology and metabolism
  • Cellular bioenergetics
  • Nutrient sensing

Background:

  • Osteoblast (OB) bioenergetics and function are critical for bone health.
  • The metabolic adaptation of OBs to varying nutrient availability, particularly glucose and lipids, is not fully understood.

Purpose of the Study:

  • To investigate the impact of glucose restriction on osteoblast metabolism and function.
  • To elucidate the role of lipid utilization in osteoblasts under low glucose conditions.

Main Methods:

  • MC3T3-E1 osteoblastic cells and primary osteoblasts (pOBs) were cultured under physiological (5.5 mM) and low (1.25 mM) glucose conditions.
  • Cell proliferation, migration, clonogenicity, and osteogenesis assays were performed.
  • Mitochondrial morphology, oxidative capacity, ATP production, lipid droplet accumulation, and gene expression related to lipolysis were analyzed.
  • Pharmacological interventions (Etomoxir, ATGListatin) were used to modulate lipid metabolism.

Main Results:

  • Low glucose (LG) decreased OB proliferation, migration, and clonogenicity but enhanced osteogenesis.
  • LG induced mitochondrial elongation, increased oxidative capacity, and elevated ATP production.
  • Evidence suggests OBs utilize lipids under LG conditions, indicated by reduced lipid droplets and upregulated lipolysis genes.
  • Inhibition of lipid utilization (Etomoxir) or lipolysis (ATGListatin) impaired osteogenesis under LG conditions.

Conclusions:

  • Osteoblast function is significantly modulated by nutrient fuel availability.
  • Lipid utilization is a fundamental process for osteoblast metabolism, especially under conditions of limited glucose.
  • These findings highlight the importance of lipid metabolism in bone health, particularly in metabolic diseases like diabetes.