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Defining cell type-specific immune responses in a mouse model of allergic contact dermatitis by single-cell
Youxi Liu1, Meimei Yin1, Xiaoting Mao2
1State Key Laboratory of Cellular Stress Biology, School of Pharmaceutical Sciences, Xiamen University, Xiamen, China.
Elife
|August 30, 2024
Summary
Dermal fibroblasts play a key role in allergic contact dermatitis (ACD) by producing CXCL9/10 chemokines, driven by IFNγ, which promotes type-1 T cell responses and skin inflammation.
Area of Science:
- Immunology
- Dermatology
- Cell Biology
Background:
- Allergic contact dermatitis (ACD) is a common inflammatory skin condition.
- The cellular interactions driving ACD pathogenesis are not fully understood.
Purpose of the Study:
- To elucidate the specific immune cell responses and the role of skin resident cells in ACD.
- To identify key molecular pathways involved in ACD development.
Main Methods:
- Single-cell transcriptomic analysis in a murine model of ACD.
- In vivo manipulation of gene expression in dermal fibroblasts.
- Analysis of human ACD skin samples.
Main Results:
- IFNγ-producing CD4+ and CD8+ T cells were dominant in ACD.
- Dermal fibroblasts targeted by IFNγ produced CXCL9/10 chemokines.
- Targeting IFNγ signaling in fibroblasts reduced inflammation and T cell infiltration.
- IFNγ+ CD8+ T cells and CXCL10-producing fibroblasts were found in human ACD skin.
Conclusions:
- Dermal fibroblasts are crucial in promoting type-1 T cell inflammation in ACD.
- The IFNGR-CXCR3 signaling pathway involving fibroblasts is critical for ACD pathogenesis.
