Nanographene Oxide Promotes Angiogenesis by Regulating Osteoclast Differentiation and Platelet-Derived Growth Factor...

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedics

Background:

• Bone remodeling relies on a balance between angiogenesis, osteoblasts, and osteoclasts.
• Dysfunctional bone remodeling and osseointegration loss are linked to imbalanced angiogenesis-osteoblast-osteoclast systems.
• Graphene oxide shows potential for bone tissue engineering scaffolds, but its effect on osteoclast-angiogenesis interactions is unknown.

Purpose of the Study:

• To investigate the effect of electrochemically derived nanographene oxide (ENGO) hydrogel on bone defect healing.
• To elucidate the role of ENGO in regulating osteoclast differentiation, angiogenesis, and related signaling pathways.
• To explore ENGO's potential for treating bone resorption and osteoclast-related bone loss diseases.

Main Methods:

• Establishment of a rat calvarial defect model treated with ENGO hydrogel.
• In vitro assessment of ENGO's effects on osteoclast differentiation markers and bone resorption.
• Analysis of angiogenesis, platelet-derived growth factor (PDGF)-BB secretion, and key molecular pathways (IDH1, KDM7A, H3K9me2).

Main Results:

• ENGO treatment led to increased angiogenesis and PDGF-BB levels in preosteoclasts within the rat calvarial defect model.
• In vitro studies showed ENGO reduced receptor activator of nuclear factor-kappaB ligand (RANKL)-induced osteoclast markers and inhibited bone resorption.
• ENGO enhanced PDGF-BB secretion and promoted angiogenesis, with isocitrate dehydrogenase 1 (IDH1) identified as a key regulator in this process.

Conclusions:

• ENGO hydrogel effectively promotes angiogenesis by modulating osteoclast maturity and enhancing PDGF-BB secretion.
• ENGO facilitates osteoclast-endothelial cell crosstalk, offering a promising strategy for bone defect repair.
• The findings highlight ENGO's therapeutic potential for bone resorption and osteoclast-related bone loss diseases.