New lanthanum (III) complex--synthesis, characterization, and cytotoxic activity.

Area of Science:

• Inorganic Chemistry
• Coordination Chemistry
• Biochemistry

Background:

• Lanthanum (III) complexes are explored for potential therapeutic applications.
• 5-aminoorotic acid serves as a novel ligand for metal complexation.
• Cancer cell lines K-562 and DOHH-2 are relevant models for drug screening.

Purpose of the Study:

• To synthesize and characterize a new lanthanum (III) complex with 5-aminoorotic acid.
• To evaluate the cytotoxic activity of the synthesized complex and the ligand against specific cancer cell lines.
• To compare the cytotoxic effects of the lanthanum (III) complex with its inorganic salt.

Main Methods:

• Synthesis of lanthanum (III) complex using lanthanum (III) nitrate and 5-aminoorotic acid.
• Structural characterization via Infrared (IR), Raman spectroscopy, and proton Nuclear Magnetic Resonance ((1)H-NMR).
• Cytotoxicity assays on K-562 and DOHH-2 cell lines, determining half-maximal inhibitory concentration (IC50) values.

Main Results:

• Successful synthesis of the lanthanum (III) complex with a 1:3 metal:ligand molar ratio.
• Spectral data confirmed coordination of the ligand to lanthanum (III), showing distinct spectral differences from the free ligand.
• The lanthanum (III) complex exhibited significant concentration-dependent cytotoxic activity against both K-562 and DOHH-2 cell lines, with notable IC50 values.
• The free ligand also showed cytotoxic effects, while the inorganic lanthanum (III) salt demonstrated minimal activity.

Conclusions:

• The synthesized lanthanum (III) complex possesses significant cytotoxic potential against chronic myeloid leukemia and non-Hodgkin lymphoma cell lines.
• The observed anti-cancer activity of the complex is superior to that of the inorganic lanthanum (III) salt.
• 5-aminoorotic acid can act as an effective chelating agent for lanthanum (III), yielding compounds with promising anti-cancer properties.