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Experimental cell research v.361 no.1, 2017년, pp.56 - 62   SCI SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

T cell responses in senior patients with community-acquired pneumonia related to disease severity

Bian, Lu-Qin (Department of Special Procurement Ward, The First Affiliated Hospital of Soochow University, Suzhou 215006 China ) ; Bi, Ying (Department of Pneumoconiosis, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai 200433 China ) ; Zhou, Shao-Wei (Department of Pneumoconiosis, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai 200433 China ) ; Chen, Zi-Dan (Department of Pneumoconiosis, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai 200433 China ) ; Wen, Jun (Department of Pneumoconiosis, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai 200433 China ) ; Shi, Jin (Department of Pneumoconiosis, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai 200433 China ) ; Mao, Ling (Department of Pneumoconiosis, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai 200433 China ) ; Wang, Ling (Department of Special Procurement Ward, The First Affiliated Hospital of Soochow University, Suzhou 215006 China ) ;
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    Abstract Senior individuals older than 65 years of age are at a disproportionally higher risk of developing pneumonia. Impaired capacity to defend against airway infections may be one of the reasons. It is generally believed that weaker regulatory T cell responses may be beneficial to host defense against pathogens. In senior patients with community-acquired bacterial pneumonia, we investigated the frequencies and functions of regulatory T cells. Interestingly, we found that compared to age- and sex-matched healthy controls, senior pneumonia patients presented lower frequencies of Foxp3-expressing and Helios-expressing CD4 + T cells. The quantity of Foxp3 and Helios being expressed, measured by their mRNA transcription levels, was also lower in CD4 + T cells from pneumonia patients. Furthermore, following TCR and TGF-β stimulation, pneumonia patients presented impaired capacity to upregulate Foxp3 and Helios. Functional analyses revealed that CD4 + T cells from pneumonia patients secreted lower amounts of IL-10 and TGF-β, two cytokines critical to regulatory T cell-mediated suppression. Also, the expression of granzyme B and perforin, which were cytolytic molecules potentially utilized by regulatory T cells to mediate the elimination of antigen-presenting cells and effector T cells, were reduced in CD4 + CD25 + T cells from senior pneumonia patients. In addition, the CD4 + CD25 + T cells from senior pneumonia patients presented reduced capacity to suppress effector CD4 + and CD8 + T cell proliferation. Moreover, the value of pneumonia severity index was inversely correlated with several parameters of regulatory T cell function. Together, our results demonstrated that senior pneumonia patients presented a counterintuitive impairment in regulatory T cell responses that was associated with worse prognosis.


  • 주제어

    Regulatory T cell .   Senior patients .   Pneumonia.  

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