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The transcription factor NR4A3 controls CD103+ dendritic cell migration
The Journal of Clinical Investigation
|November 8, 2016
Summary
The transcription factor NR4A3 is crucial for CD103+ dendritic cell migration to lymph nodes. Loss of NR4A3 impairs CCR7 expression, hindering dendritic cell movement.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Nuclear receptors, including the Nr4a family, play diverse roles in cellular function.
- Dendritic cells (DCs) are critical for initiating immune responses, requiring migration to lymph nodes (LNs).
- CD103+ DCs are a subset of DCs involved in immune surveillance and T cell priming.
Purpose of the Study:
- To investigate the role of the transcription factor NR4A3 in the migration of CD103+ dendritic cells.
- To elucidate the molecular mechanisms underlying NR4A3-mediated regulation of DC migration.
- To determine the impact of NR4A3 deficiency on chemokine receptor expression and cellular function.
Main Methods:
- Generation and analysis of Nr4a3-deficient mice.
- Mixed-chimera studies to assess cell-intrinsic migratory defects.
- Flow cytometry to analyze surface expression of CCR7 on DCs and T lymphocytes.
- In vivo stimulation with TLR7 agonist and infection models.
- Western blot analysis to assess protein levels (e.g., FOXO1).
Main Results:
- Nr4a3 deficiency resulted in a significant reduction of CD103+ migratory DCs in lymph nodes.
- Cell-intrinsic defects in migration were observed in Nr4a3-deficient DCs.
- Surface expression of the chemokine receptor CCR7 was markedly reduced on CD103+ DCs lacking NR4A3.
- CCR7 expression remained low in Nr4a3-deficient DCs even after in vivo stimulation or infection.
- FOXO1 protein levels were reduced in Nr4a3-deficient DCs via an AKT-dependent pathway.
- NR4A3 is also involved in maintaining mitochondrial function in CD103+ DCs, potentially independent of the CCR7 axis.
Conclusions:
- NR4A3 is essential for the migration of CD103+ dendritic cells to lymph nodes.
- NR4A3 regulates CCR7 expression in a cell-intrinsic manner in CD103+ DCs.
- The NR4A3/FOXO1/AKT pathway is implicated in controlling CCR7-dependent DC migration.
- NR4A3 plays a multifaceted role in CD103+ DC function, including migration and mitochondrial homeostasis.
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