Selenite Substituted Calcium Phosphates: Preparation, Characterization, and Cytotoxic Activity

Area of Science:

• Biomaterials Science
• Biomedical Engineering
• Materials Chemistry

Background:

• Osteosarcoma therapy requires novel biomaterials with targeted efficacy.
• Calcium phosphate (CaP) systems offer a versatile platform for drug delivery and therapeutic applications.
• Selenium-containing compounds have shown potential in cancer treatment.

Purpose of the Study:

• To prepare and characterize biomimetic selenium-substituted calcium phosphate (CaP) systems.
• To evaluate the potential of these systems in osteosarcoma therapy.
• To investigate the effect of selenite ion doping on CaP properties and cellular activity.

Main Methods:

• Wet precipitation method using biogenic CaCO3, urea-H3PO4, and Na2SeO3·5H2O.
• Characterization techniques included FTIR, elemental analysis, SEM, XRD, and Rietveld refinement.
• In vitro studies involved incubation in simulated body fluid and cytotoxicity/viability tests on healthy and osteosarcoma cell lines.

Main Results:

• Prepared powders consisted of calcium-deficient carbonated hydroxyapatite (HAp), octacalcium phosphate (OCP), and amorphous calcium phosphate (ACP).
• Presence of Sr2+, Na+, and Mg2+ ions from cuttlefish bone precursor.
• Selenite doping enhanced HAp thermal stability, and a powder with Se/(P + Se) molar ratio of 0.007 exhibited selective toxicity to cancer cells.

Conclusions:

• Biomimetic selenium-substituted CaP systems can be successfully prepared.
• These materials show potential for targeted osteosarcoma therapy due to selective cancer cell toxicity.
• Further research is warranted to optimize these materials for clinical applications.