Characteristics and Functional Analysis of CD4<sup>+</sup> T Lymphocyte Subsets in Mice Infected with <i>Streptococcus pneumoniae</i>

Yuehong DONG; Yu ZHAO; Yiqun KUANG; Jie JIA

doi:10.12259/j.issn.2095-610X.S20250606

Volume 46 Issue 6

Jun. 2025

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Yuehong DONG, Yu ZHAO, Yiqun KUANG, Jie JIA. Characteristics and Functional Analysis of CD4+ T Lymphocyte Subsets in Mice Infected with Streptococcus pneumoniae[J]. Journal of Kunming Medical University, 2025, 46(6): 46-53. doi: 10.12259/j.issn.2095-610X.S20250606

Citation:

Yuehong DONG, Yu ZHAO, Yiqun KUANG, Jie JIA. Characteristics and Functional Analysis of CD4⁺ T Lymphocyte Subsets in Mice Infected with Streptococcus pneumoniae[J]. Journal of Kunming Medical University, 2025, 46(6): 46-53. doi: 10.12259/j.issn.2095-610X.S20250606

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Characteristics and Functional Analysis of CD4⁺ T Lymphocyte Subsets in Mice Infected with Streptococcus pneumoniae

doi: 10.12259/j.issn.2095-610X.S20250606

Research Center for Clinical Medicine，The First Affiliated Hospital of Kunming Medical University，Kunming Yunnan 650032，China

Received Date: 2025-03-05
Publish Date: 2025-06-25

Abstract

Abstract

Objective To analyze the levels and functions of CD4⁺ T cell subsets in mouse spleen and lung tissues after Streptococcus pneumoniae （S.P.） infection, and to explore the immune regulatory mechanisms S.P. infection. Methods Flow cytometry was used to detect the proportions of CD4⁺ T cell subsets （Th1, Th2, Th17, and Treg cells） in mouse spleen tissues from control group （n = 4） , S.P. infection at 12 h （n = 4）, and 24 h （n = 4）. H&E staining was used to examine lung tissue pathological characteristics. Differential gene sets and functional changes in lung tissues were analyzed after S.P. infection for 2 and 5 days, and immune cell abundance was predicted. Results Significant inflammatory pathological features were observed in the lung tissues of mice after S.P. infection. The proportions of Th1 and Treg cells in the spleen tissues gradually increased after S.P. infection, with Th1 and Treg cell proportions significantly higher than the control group at 24 h post-infection （P < 0.05）. At 5 d post-infection, only Treg cell proportion was significantly higher than the control group （P < 0.05）. Functional analysis revealed abnormal activation of IL6, IL10, and IL4/IL13 signaling pathways 2 days after infection, and abnormal enrichment of IL-2 and IL-6/TGF-β pathways 5 days after infection. Conclusion Treg and Th1 cells are key immune regulatory cells in mice following S.P. infection. Modulating Treg cell function mediated by IL-10 and Th1 cell function mediated by IL-2 can improve immune responses after S.P. infection.
- Streptococcus pneumoniae,
- Pneumonia,
- CD4⁺ T cell,
- Treg cell,
- Th1 cell,
- Immunoregulation

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References(32)

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