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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Dendritic cells (DCs) are crucial for initiating adaptive immune responses by migrating to lymph nodes.
  • DC migration to lymphatics is guided by the CCL21 chemokine gradient acting on the CCR7 receptor.
  • The role of the gap junction protein Connexin 43 (Cx43) in DC migration remains unclear.

Purpose of the Study:

  • To investigate the contribution of Cx43 to CCL21/CCR7-dependent dendritic cell migration.
  • To evaluate the impact of Cx43 deficiency or truncation on DC recruitment and migration dynamics in vivo and in vitro.

Main Methods:

  • Utilized wild-type (WT), Cx43 heterozygous (Cx43+/-), and Cx43 C-terminus truncated (Cx43K258/-) mice.
  • Assessed myeloid DC (mDC) recruitment to lymph nodes in a skin inflammation model.
  • Performed in vitro chemotaxis assays with bone marrow-derived dendritic cells (BMDCs) towards CCL21.
  • Analyzed DC surface marker expression and CCR7-induced intracellular calcium signaling.

Main Results:

  • Cx43K258/- mice exhibited reduced mDC recruitment to lymph nodes compared to WT and Cx43+/- mice.
  • In vitro migration of Cx43K258/- BMDCs towards CCL21 was abolished, while Cx43+/- BMDCs showed reduced migration.
  • Both Cx43 mutant genotypes displayed impaired directional migration of BMDCs.
  • No differences in surface marker expression or CCR7-induced calcium signaling were observed between genotypes.

Conclusions:

  • Full expression of intact Cx43 is critical for the directional migration and speed of dendritic cells.
  • Cx43 influences DC migration independently of surface marker expression and CCR7 signaling pathways.
  • These findings suggest Cx43 as a potential target for modulating immune responses via DC migration.