Mitochondrial transplantation: new challenges for cancer

This review discusses the uniqueness of mitochondria providing normal cellular functions and at the same time involved in many pathological conditions, and also analyzes the scientific literature to clarify the effectiveness of mitochondrial transplantation in cancer treatment. Being important and semi-autonomous organelles in cells, they are able to adapt their functions to the needs of the corresponding organ. The ability of mitochondria to reprogram is important for all cell types that can switch between resting and proliferation. At the same time, tumor mitochondria undergo adaptive changes to accelerate the reproduction of tumor cells in an acidic and hypoxic microenvironment. According to emerging data, mitochondria can go beyond the boundaries of cells and move between the cells of the body. Intercellular transfer of mitochondria occurs naturally in humans as a normal mechanism for repairing damaged cells. The revealed physiological mitochondrial transfer has become the basis for a modern form of mitochondrial transplantation, including autologous (isogenic), allogeneic, and even xenogenic transplantation. Currently, exogenous healthy mitochondria are used in treatment of several carcinomas, including breast cancer, pancreatic cancer, and glioma. Investigation of the functional activity of healthy mitochondria demonstrated and confirmed the fact that female mitochondria are more efficient in suppressing tumor cell proliferation than male mitochondria. However, tissue-specific sex differences in mitochondrial morphology and oxidative capacity were described, and few studies showed functional sex differences in mitochondria during therapy. The reviewed studies report that mitochondrial transplantation can be specifically targeted to a tumor, providing evidence for changes in tumor function after mitochondrial administration. Thus, the appearance of the most interesting data on the unique functions of mitochondria indicates the obvious need for mitochondrial transplantation.

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