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Cell to Cell Interaction Can Activate Membrane-bound APRIL Which Are Expressed on Inflammatory Macrophages

  • Lee, Sang-Min (From School of Life Sciences and Biotechnology, Kyungpook National University) ;
  • Kim, Won-Jung (From School of Life Sciences and Biotechnology, Kyungpook National University) ;
  • Suk, Kyoung-Ho (Department of Pharmacology, Brain Science and Engineering Institute, College of Medicine, Kyungpook National University) ;
  • Lee, Won-Ha (From School of Life Sciences and Biotechnology, Kyungpook National University)
  • Received : 2010.08.13
  • Accepted : 2010.10.15
  • Published : 2010.10.30
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Abstract

Background: APRIL, originally known as a cytokine involved in B cell survival, is now known to regulate the inflammatory activation of macrophages. Although the signal initiated from APRIL has been demonstrated, its role in cellular activation is still not clear due to the presence of BAFF, a closely related member of TNF superfamily, which share same receptors (TACI and BCMA) with APRIL. Methods: Through transfection of siRNA, BAFF-deficient THP-1 cells (human macrophage-like cells) were generated and APRIL-mediated inflammatory activities were tested. The expression patterns of APRIL were also tested in vivo. Results: BAFF-deficient THP-1 cells responded to APRIL-stimulating agents such as monoclonal antibody against APRIL and soluble form of TACI or BCMA. Furthermore, co-incubation of the siBAFF-deficient THP-1 cells with a human B cell line (Ramos) resulted in an activation of THP-1 cells which was dependent on interactions between APRIL and TACI/BCMA. Immunohistochemical analysis of human pathologic samples detected the expression of both APRIL and TACI in macrophage-rich areas. Additionally, human macrophage primary culture expressed APRIL on the cell surface. Conclusion: These observations indicate that APRIL, which is expressed on macrophages in pathologic tissues with chronic inflammation, may mediate activation signals through its interaction with its counterparts via cell-to-cell interaction.

Keywords

References

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