Response of regulatory T cells to classic heat stroke in mice

Hu,Jie; Kang,Hong‑Jun; Liu,Chao; Hu,Pan; Yang,Meng‑Meng; Zhou,Fei‑Hu

doi:10.3892/etm.2018.6766

Response of regulatory T cells to classic heat stroke in mice

Authors:
- Jie Hu
- Hong‑Jun Kang
- Chao Liu
- Pan Hu
- Meng‑Meng Yang
- Fei‑Hu Zhou
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Affiliations: Critical Care Medicine, Chinese PLA General Hospital, Beijing 100853, P.R. China
Published online on: September 19, 2018 https://doi.org/10.3892/etm.2018.6766
Pages: 4609-4615
Copyright: © Hu et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Systemic inflammatory response syndrome (SIRS) is an important process associated with the pathogenesis of multiple organ failure resulting from heat stroke (HS). Alterations in the levels of circulating cytokines during the progression of SIRS have been well established. However, only a small number of studies have demonstrated the responses of lymphocytes during HS, and no studies have investigated immune‑regulatory cells, such as regulatory T cells (Tregs). Tregs have been revealed to be important in numerous inflammation‑associated diseases, and have exhibited promising therapeutic effects in both experimental and clinical trials. In the present study, the splenic Treg response in a classic HS mouse model was investigated, and the results demonstrated that total numbers of splenic Tregs were significantly decreased at 0, 24 and 72 h time intervals post‑heat stress. Furthermore, the immunosuppressive capacity of splenic Tregs on cluster of differentiation (CD)4+T cell expansion was revealed to be suppressed following heat stress. In addition, HS was demonstrated to downregulate the expression levels of surface inhibitory molecules (CD39, CD73 and cytotoxic T‑lymphocyte associated protein 4), as well as anti‑inflammatory cytokines [interleukin (IL)‑10, transforming growth factor‑β and IL‑35], in Tregs. It was hypothesized that the aforementioned Treg responses may contribute to SIRS during HS. To the best of our knowledge, the present study is the first study to investigate the response of Tregs to HS, and the results demonstrated that there were significant alterations regarding to the total number, and function, of splenic Tregs, as well as the expression levels of inhibitory surface molecules and secretory cytokines. These results may highlight a novel mechanism underlying the pathogenesis of HS, as well as identify a potential therapeutic target for SIRS in patients suffering from HS.

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