Cerium oxide nanoparticles protect against irradiation-induced cellular damage while augmenting osteogenesis

Area of Science:

• Biomaterials Science
• Nanotechnology
• Cell Biology

Background:

• Ionizing radiation (IR) therapy for cancer can cause significant bone loss and fracture risk.
• This bone degradation is partly due to excessive reactive oxygen species (ROS) release.
• Cerium oxide nanoparticles (CeONPs) possess known antioxidant and regenerative properties.

Purpose of the Study:

• To investigate the efficacy of CeONPs in mitigating IR-induced damage in human bone marrow-derived mesenchymal stromal cells (hBMSCs).
• To evaluate the impact of CeONPs on cellular functions related to bone health and radiation response.

Main Methods:

• hBMSCs were treated with CeONPs (1 or 10 μg/mL) 24 hours before a single 7 Gy irradiation dose.
• Assessed ROS levels, proliferation, morphology, senescence, DNA damage, p53 expression, and autophagy.
• Evaluated alkaline phosphatase, osteogenic gene expression, and bone matrix deposition post-osteogenic differentiation.

Main Results:

• CeONPs (1 μg/mL) enhanced autophagy, osteogenesis, and bone matrix deposition by over 2-fold in non-irradiated cells.
• Post-irradiation, CeONPs significantly reduced ROS and DNA damage (>4-fold) and increased autophagy and bone matrix deposition (5-fold).
• CeONPs (10 μg/mL) increased p53 expression 3.5-fold post-irradiation.

Conclusions:

• CeONP cellular uptake provides a significant protective effect against IR-induced damage.
• CeONPs promote osteogenic differentiation and new bone deposition, counteracting radiation-induced bone loss.
• CeONPs represent a promising multifunctional therapeutic strategy for managing irradiation-induced bone complications.