Mitochondrial Targeted Cerium Oxide Nanoclusters for Radiation Protection and Promoting Hematopoiesis

Area of Science:

• Nanomaterials science
• Biomedical engineering
• Radiology

Background:

• Mitochondrial oxidative stress contributes to cell apoptosis.
• Cerium oxide nanomaterials can scavenge free radicals and mimic superoxide dismutase (SOD) and catalase (CAT) activities.
• Poor targeting limits the efficacy of traditional cerium oxide nanomaterials.

Purpose of the Study:

• To design albumin-cerium oxide nanoclusters (TPP-PCNLs) for enhanced mitochondrial targeting.
• To evaluate the radioprotective effects of TPP-PCNLs.
• To investigate the mechanism of TPP-PCNLs in mitigating radiation-induced damage.

Main Methods:

• Characterization of nanoclusters (CNLs, PCNLs, TPP-PCNLs) including morphology, size, and stability.
• In vitro studies: cellular uptake, colocalization, cell viability, apoptosis, and comet assays.
• In vivo studies: histopathology, survival rate, weight change, hematopoietic function, and Western blot analysis.

Main Results:

• TPP-PCNLs demonstrated good stability and biocompatibility, with excellent mitochondrial targeting.
• These nanoclusters effectively regulated reactive oxygen species (ROS) levels and improved mitochondrial integrity in irradiated cells.
• In vivo, TPP-PCNLs enhanced survival rates, weight, and hematopoietic function in irradiated animals, showing a radiation dose reduction factor of 1.30.

Conclusions:

• TPP-PCNLs offer a promising strategy for radiation protection by targeting mitochondria.
• Continuous clearance of ROS by TPP-PCNLs protects extramedullary hematopoietic organs, particularly the liver.
• The mechanism involves regulating the mitochondrial apoptotic pathway to mitigate radiation-induced DNA damage.