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Published on: March 7, 2022
Transforming growth factor beta1 up-regulates interferon regulatory factor 8 during dendritic cell development
Xin-Sheng Ju1, David Ruau, Piritta Jäntti
1Institute for Biomedical Engineering, Department of Cell Biology, Aachen University Hospital, Aachen, Germany.
Transforming growth factor beta1 (TGF-beta1) signaling directly regulates interferon regulatory factor 8 (IRF-8) in dendritic cells (DC). This pathway impacts DC function and migration by influencing CCR7 expression.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Langerhans cells (LC) are key dendritic cells (DC) in the skin.
- LC development requires transforming growth factor beta1 (TGF-beta1), as TGF-beta1 knockout mice lack LC.
Purpose of the Study:
- To identify novel TGF-beta1 target genes in dendritic cells (DC).
- To elucidate the molecular mechanisms by which TGF-beta1 influences DC phenotype and function.
Main Methods:
- Utilized a two-step cell culture system for dendritic cells (DC).
- Employed transcriptional profiling via DNA microarrays to identify target genes.
- Investigated signaling pathways using Smad7 expression and SB431542 inhibitor.
Main Results:
- Identified interferon regulatory factor 8 (IRF-8) as a direct TGF-beta1 target gene in DC.
- Demonstrated TGF-beta1 induces Smad2/3 phosphorylation and IRF-8 expression, independent of protein synthesis.
- Showed TGF-beta1 upregulates chemokine receptor CCR7 and enhances DC migration, a process involving IRF-8.
Conclusions:
- A novel TGF-beta1/Smad/IRF-8 signaling pathway regulating DC function was identified.
- This pathway is crucial for CCR7 expression and DC migration.
- IRF-8 plays a significant role in mediating TGF-beta1's effects on DC phenotype and migration.
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