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Scientists have studied recently how magnet nanoparticles affect cancer cells in the human liver.

Because of their unique properties, magnetic nanoparticles can be used for therapeutic diagnostics and personalized treatment of cancer diseases, as well as be an effective contrast agent for MRI examination and imaging of tumors.

It is known that human cancer cells can absorb magnetic nanoparticles. This property can be used in cancer therapy in at least three ways: local heating of a tumour when exposed to a variable magnetic field (magnetic hyperthermia), targeted drug delivery, or selective cytotoxic effects of nanoparticles on cancer cells.

Scientists from the IKBFU Laboratory of Novel Magnet Materials studied the peculiarities of nanoparticles' influence on cell organelles and got acquainted with the peculiarities of intracellular processes in detail by using different lines of liver cancer cells. Small objects such as nanoparticles can be easily 'eaten' by cells, but this does not always happen—in some cases, nanoparticles can damage the structure of a cell, penetrate it and kill it. By adding iron oxide nanoparticles of various shapes to the nutrient medium of cells, scientists were able to check the degree and nature of the changes in cell culture.

The behavior of cancer cells depends on the concentration of nanoparticles in the solution and, most importantly, the type of cancer. The fact is that different cells respond differently to the same particles. This makes it possible to create an instrument based on nanoparticles, selectively suppressing cancer cells while keeping healthy cells intact.

Scientists have carried out experiments on how cancer cells in the human liver react to various types of magnet nanoparticles. They found that iron oxide nanocubes and nanoclusters are capable of activating certain genes that give a 'self-destruct command' to liver cancer cells. This discovery sheds light on the mechanisms that regulate cell death caused by the cytotoxicity of nanoparticles.

The mechanism of toxic effect is associated with the progressive permeability of lysosomal membranes in hepatocytes, which provokes the processes of apoptosis and autophagy, basically, 'cell death.

Source: Kateryna Levada et al, Progressive lysosomal membrane permeabilization induced by iron oxide nanoparticles drives hepatic cell autophagy and apoptosis, Nano Convergence (2020). DOI: 10.1186/s40580-020-00228-5

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