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IFN{alpha} enhances human B-cell chemotaxis by modulating ligand-induced chemokine receptor signaling and

Gamal Badr1, Gwenoline Borhis, Dominique Treton

  • 1Institut National de la Santé et de la Recherche Medicale U 131, Institut Paris-Sud sur les Cytokines, 32 rue des Carnets, 92 140, Clamart, France.

International Immunology
|March 8, 2005
PubMed

Insights

Interferon-alpha (IFNalpha) boosts human B cell migration towards chemokines CCL20, CCL21, and CXCL12. This effect is dose- and time-dependent, enhancing memory B cell migration more significantly than naive B cells.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Chemokines are crucial for immune cell trafficking.
  • B cell migration is essential for immune responses.
  • Interferon-alpha (IFNalpha) is a cytokine with diverse immune-modulating functions.

Purpose of the Study:

  • To investigate the effect of IFNalpha on human B cell chemotaxis towards specific chemokines.
  • To elucidate the downstream signaling pathways involved in IFNalpha-mediated B cell migration.
  • To characterize the role of IFNalpha in chemokine receptor regulation.

Main Methods:

  • Human B cells were treated with varying doses and times of IFNalpha.
  • Chemotaxis assays were performed using CCL20, CCL21, and CXCL12 as chemoattractants.
  • Expression of chemokine receptors (CCR6, CCR7, CXCR4) was analyzed.
  • Intracellular signaling pathways (PI3K/PKB, NF-kappaB, RhoA, ERK1/2) were assessed.
  • Chemokine receptor internalization was measured.

Main Results:

  • IFNalpha significantly increased B cell chemotaxis to CCL20, CCL21, and CXCL12 in a dose- and time-dependent manner.
  • Memory B cells showed a 2.6-fold greater enhancement in migration compared to naive B cells.
  • IFNalpha modulated signaling pathways, increasing dependence on PI3K, RhoA, and NF-kappaB, and introducing ERK1/2 dependence.
  • IFNalpha reduced ligand-induced chemokine receptor internalization.

Conclusions:

  • IFNalpha enhances human B cell chemotaxis and modulates chemokine receptor signaling pathways.
  • Specific downstream effectors like PI3K, RhoA, and NF-kappaB are critical for IFNalpha-driven B cell migration.
  • IFNalpha influences chemokine receptor dynamics, impacting B cell trafficking and immune responses.

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