IMAGE: The mechanism of oxidative stress. view more
Credit: Courtesy of Allen Dressen
Long-term use of anti-cancer drugs treatment may lead to the development of multiple drug resistance reducing the efficiency of chemotherapy. Scientists are aware of several mechanisms for drug resistance development in tumor cells. They are to a great extent associated with the activation of proteins that get medicinal drugs out of cells, as well as with changes in the genes controlling cell survival and programmed cell death (apoptosis). One of the least studied mechanisms of drug resistance development is connected with the influence of reactive oxygen species (ROS) that are formed during cell life and can destroy organic molecules.
RUDN biochemists studied the mechanism of drug resistance development in ovarian cancer cells under treatment with cisplatin. The researchers found out that the process was connected with increased expression (production of proteins coded by DNA molecules) of genes of key antioxidant enzymes (i.e. destroying ROS): Mn-superoxide dismutase, catalase, glutathione peroxidase-1, hemoxygenase-1, as well as reduced expression of the enzyme NADPH-oxidase, which is responsible for ROS generation in the cell.
In the normal state there is a balance between the formation and destruction of ROS. Any changes in
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