Dysfunction of S100A4 + effector memory CD8 + T cells aggravates asthma.
Huilei ZhangShuangqing LiuYanan LiJianru LiChen NiMing YangJun DongZhaoqing WangZhihai QinPublished in: European journal of immunology (2022)
Progressive loss of effector functions, especially IFN-γ secreting capability, in effector memory CD8 + T (CD8 + T EM ) cells plays a crucial role in asthma worsening. However, the mechanisms of CD8 + T EM cell dysfunction remain elusive. Here, we report that S100A4 drives CD8 + T EM cell dysfunction, impairing their protective memory response and promoting asthma worsening in an ovalbumin (OVA)-induced asthmatic murine model. We find that CD8 + T EM cells contain two subsets based on S100A4 expression. S100A4 + subsets exhibit dysfunctional effector phenotypes with increased proliferative capability, whereas S100A4 - subsets retain effector function but are more inclined to apoptosis, giving rise to a dysfunctional CD8 + T EM cell pool. Mechanistically, S100A4 upregulation of mitochondrial metabolism results in a decrease of acetyl-CoA levels, which impair the transcription of effector genes, especially ifn-γ, facilitating cell survival, tolerance, and memory potential. Our findings thus reveal general insights into how S100A4 + CD8 + T EM cells reprogram into dysfunctional and less protective phenotypes to aggravate asthma.
Keyphrases
- dendritic cells
- cell cycle arrest
- induced apoptosis
- oxidative stress
- regulatory t cells
- chronic obstructive pulmonary disease
- lung function
- single cell
- type iii
- cell death
- immune response
- working memory
- poor prognosis
- cell therapy
- peripheral blood
- stem cells
- endoplasmic reticulum stress
- dna methylation
- cystic fibrosis
- cell proliferation
- signaling pathway
- air pollution
- pi k akt
- mesenchymal stem cells
- climate change
- risk assessment
- long non coding rna
- drug induced
- diabetic rats