Abstract
It is well known, that tumor growth down-regulates T-cell immunity, but it also induces significant changes of iron metabolism. We hypothesized that iron deficiency may be one of the many factors linked to the development of immunodepression observed in tumor growth. Here for the first time we compared cellular proliferation in two lymphoid organs—thymus and spleen, with iron status of these organs in mice bearing transplantable tumor. Serum and liver iron levels were measured to evaluate general iron status. On day 21, thymus weight and cellularity started to dramatically decrease in hepatoma 22a bearing mice as compared to controls, while spleen weight and cellularity increased. Thymocyte proliferation was down-regulated in these animals, but no decrease of splenocyte proliferation was observed. At the same time, thymus non-heme iron content was higher and the spleen iron was lower in tumor mice compared to controls. It may be supposed, that spleen and thymus iron contents are sufficient to cover demands for cellular proliferation in these organs. The expression of surface transferrin receptor (CD71) on thymocytes did not diminish as well as thymus tissue catalase activity, which confirm the absence of iron deficiency in the thymus. Here we investigated parameters of iron metabolism in the thymus during the growth of transplantable tumor for the first time. Finelly, iron deficiency cannot be considered as a cause of immunological disorders, such as thymic involution and down-regulation of thymocytes proliferation, observed in mice bearing hepatoma 22a. Iron-independent mechanisms may play a role in these processes. This data elucidate one, related to iron, aspect of tumor-induced metabolic influence on the immune system.
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This work was carried out within the framework of the planned research project of the Federal State Budgetary Scientific Institution “IEM” no. 0557-2019-0006.
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Statement on the welfare of animals. The study followed all applicable international guidelines for the use of laboratory animals. The study was approved by the local ethical committee at the Federal State Budgetary Scientific Institution “IEM” (protocol no. 2/15 dated February 26, 2015).
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Zelenskyi, E.A., Rutto, K.V., Kudryavtsev, I.V. et al. Iron Content and Cellular Proliferation in Thymus and Spleen of Hepatoma 22A Bearing Mice. Cell Tiss. Biol. 15, 393–401 (2021). https://doi.org/10.1134/S1990519X21040118
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DOI: https://doi.org/10.1134/S1990519X21040118