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Abstract
Akt/mTOR/p70S6K1 signaling pathway plays an important role in the pathogenesis of cancer and diabetes. Macrophages and lymphocytes are involved in the pathogenesis of diabetes, diabetic atherosclerosis, formation of insulin resistance as well as immune response to cancer and tumor maintenance. The aim of the study was to determine the activation of Akt/mTOR/p70S6K1 in peripheral blood mononuclear cell (PBMC) of patients with type 2 diabetes (T2D) and cancer. Results. The level of insulin in the blood of diabetic patients with breast and endometrial cancer was significantly higher compared to control, whereas it did not differ from control in the blood of diabetic patients with colorectal and pancreatic cancer. The highest level of insulin was observed in the blood of patients with T2D solely. Almost the same pattern was observed concerning IGF‑1 blood concentration. Akt S473 phosphorylation by mTORC2 was higher than control values in PBMC of breast and endometrial cancer diabetic patients. The level of Akt phosphorylation in PBMC of diabetic patients with colorectal and pancreatic cancer was lower then in control cells that corresponds to insulin and IGF‑1 concentrations in the blood. There was no activation of Akt by mTORC2 in PBMC of diabetic patients. There is no activation of mTORC1 in PBMC of patients with cancer and diabetes but there is its significant activation in the cells of patients with T2D only. Probably the Akt activation by mTORC2 is not associated with activation of mTORC1 in the cells of patients with T2D. The decrease in mTORC1 activity occurred in the cells of diabetic patients with all studied types of cancer. It can be assumed, that diabetes-related PI3K/Akt signaling in PBMC is likely to interfere with cancer-related signaling mechanisms. There were the differences in oncological patientswith T2D between breast/endometrial cancers, and pancreatic/bowel cancers considering IGF/insulin content in the blood and Akt activation in the PMBC, that could be explained by the specific hormonal background of the first types of cancers. Conclusion. The hypothesis of reciprocal Akt phosphorylation by the PDK1 and mTORC2 complexes on Thr308 and Ser473, respectively, is discussed.
References
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