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The cytotoxicity of CdTe quantum dots and the relative contributions from released cadmium ions and nanoparticle
Yuanyuan Su1, Mei Hu, Chunhai Fan
1State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, 22 Hankou Road, Nanjing 210093, PR China.
Abstract:
A systematic study was carried out on the relationship between the cytotoxicity of quantum dots (QDs) and free cadmium ions using CdCl(2) solution with known amounts of Cd(2+) as the control. We found that the CdTe QDs were more cytotoxic than CdCl(2) solutions even when the intracellular Cd(2+) concentrations were identical in HEK293 cells treated with them, implying the cytotoxicity of CdTe QDs cannot attributed solely to the toxic effect of free Cd(2+). Moreover, we discovered that the cytotoxicity of QDs was based on the concentration of total QDs ingested by cells. Our data clearly showed that specific properties of nanoparticles have an obvious influence on their cytotoxicity.
