ETV2 regulating PHD2-HIF-1α axis controls metabolism reprogramming promotes vascularized bone regeneration

Area of Science:

• Biomaterials Science
• Stem Cell Biology
• Regenerative Medicine

Background:

• Synchronized bone and blood vessel development is crucial for bone regeneration.
• Energy metabolism is vital for osteogenesis.
• ETS variant 2 (ETV2) influences osteogenesis and angiogenesis.

Purpose of the Study:

• To investigate ETV2's role in osteogenic differentiation of dental pulp stem cells (DPSCs).
• To explore ETV2's impact on cellular energy metabolism for bone regeneration.
• To evaluate the synergistic effect of ETV2-modified DPSCs and biomaterials for bone defect repair.

Main Methods:

• In vitro molecular experiments to elucidate the ETV2-PHD2-HIF-1α-VEGFA axis.
• Analysis of energy metabolism reprogramming (aerobic respiration and glycolysis) in DPSCs.
• Engineering of hydroxyapatite/chitosan microspheres (HA/CS MS) for enhanced DPSC function.
• In vivo animal studies to assess bone defect regeneration.

Main Results:

• ETV2 enhances DPSC osteogenic differentiation via the ETV2-PHD2-HIF-1α-VEGFA pathway.
• ETV2 accelerates both mitochondrial aerobic respiration and glycolysis, meeting energy demands for osteogenesis.
• ETV2 modification reduces α-ketoglutarate release, aiding microcirculation reconstruction.
• Combined ETV2-DPSCs and HA/CS MS significantly promote critical-size bone defect regeneration.

Conclusions:

• ETV2 is a key regulator of energy metabolism reprogramming essential for vascularized bone regeneration.
• The engineered HA/CS MS biomaterial enhances ETV2-mediated bone regeneration.
• This study presents a novel therapeutic strategy for bone tissue regeneration by activating energy metabolism and maintaining hypoxia signaling.