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The X-linked gene Cosmc is crucial for B cell development and homing to lymph nodes. Its absence impairs O-glycosylation, blocking proper B cell trafficking and chemokine signaling.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Glycobiology

Background:

  • Lymphocyte homing to lymph nodes is vital for immune surveillance but its molecular regulation is not fully understood.
  • Protein O-glycosylation plays a role in cellular functions, including cell trafficking.

Purpose of the Study:

  • To investigate the role of the X-linked gene Cosmc and its impact on O-glycosylation in B cell development and homing.
  • To elucidate the specific mechanisms by which Cosmc deficiency affects B cell trafficking.

Main Methods:

  • Generated B cell-specific Cosmc-deficient mice.
  • Utilized cell transfer experiments to assess B cell homing in vivo.
  • Performed enzymatic desialylation of wild-type B cells.
  • Analyzed B cell adhesion to high endothelial venules (HEV) and chemokine signaling responses.

Main Results:

  • B cell-specific deletion of Cosmc led to developmental blocks and impaired homing of B cells to lymph nodes and non-lymphoid organs.
  • Enzymatic removal of sialic acid from wild-type B cells also inhibited lymph node migration, highlighting the importance of sialylated O-glycans.
  • Cosmc-deficient B cells exhibited normal rolling and arrest on HEVs but failed in transendothelial migration.
  • These cells also displayed defective responses to chemokine signaling.

Conclusions:

  • Cosmc is essential for proper B cell development and homing.
  • O-glycosylation, particularly sialylation, mediated by Cosmc is critical for B cell trafficking.
  • Cosmc influences B cell homing by affecting transendothelial migration and chemokine signaling, not initial adhesion.