Abstract
Introduction: Redox interactions play a key role in radiation injury including heart diseases. In present study, we aimed to detect the possible protective role of selenium-L-methionine on infiltration of immune cells and Duox1&2 upregulation in rat’s heart tissues. Methods: In this study, 20 rats were divided into 4 groups (5 rats in each) namely: irradiation; irradiation plus Selenium-L-methionine; control; and Selenium-L-methionine treatment. Irradiation (15 Gy to chest) was performed using a cobalt-60 gamma ray source while 4 mg/kg of selenium-L-methionine was administered intraperitoneally. Ten weeks after irradiation, rats were sacrificed for detection of IL-4 and IL-13 cytokines, infiltration of macrophages and lymphocytes as well as the expressions of IL4Ra1, Duox1, IL13Ra2 and Duox2. Results: Results showed an increase in the level of IL-4 as well as the expressions of IL4Ra1, Duox1 and Duox2. Similarly, there was an increase in the infiltration of lymphocytes and macrophages. There was significant attenuation of all these changes following treatment with selenium-L-methionine. Conclusion: Selenium-L-methionine has the potential to protect heart tissues against radiation injury. Downregulation of pro-oxidant genes and modulation of some cytokines such as IL-4 are involved in the radioprotective effect of selenium-L-methionine on heart tissues.
Highlights
Redox interactions play a key role in radiation injury including heart diseases
Some epidemiological reports show that people who were exposed to ionizing radiation during the Hiroshima and Nagasaki incidents had an increased risk of death as a result of heart diseases.[2]
Histopathological evaluation Radiation could significantly increase the infiltration of macrophages and lymphocytes
Summary
We aimed to detect the possible protective role of selenium-L-methionine on infiltration of immune cells and Duox1&2 upregulation in rat’s heart tissues. Studies have shown a significant increase in heart diseases for patients with left breast cancer compared to those with right breast cancer.[4] Increased incidence of heart diseases was observed for patients who underwent radiotherapy with the heart exposed to whole body irradiation (for bone marrow transplantation) or Hodgkin’s disease.[5] The American Society of Clinical Oncology reported a 30% increase in the incidence of heart diseases 10 years after treatment.[6] It has been proposed that there is a linear relation between the received radiation doses to heart
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