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Down syndrome candidate region-1 protein interacts with Tollip and positively modulates interleukin-1

Jae Youn Lee1, Hyun Jung Lee, Eun Jung Lee

  • 1Department of Biology, College of Life Science and Biotechnology, Yonsei University, Seoul 120-749, Korea.

Biochimica Et Biophysica Acta
|September 1, 2009
PubMed
Abstract

Insights

The Down syndrome candidate region-1 gene (DSCR1) 1S isoform enhances IL-1 receptor signaling. DSCR1-1S positively modulates the Tollip/IRAK-1/TRAF6 complex, stimulating downstream pathways.

Area of Science:

  • Molecular biology
  • Immunology
  • Genetics

Background:

  • The Down syndrome candidate region-1 gene (DSCR1, also known as RCAN1) is located near the Down Syndrome Critical Region (DSCR).
  • DSCR1 is known to modulate calcineurin phosphatase activity, but its precise functions remain unclear.
  • The role of DSCR1 in inflammatory signaling pathways is not fully understood.

Purpose of the Study:

  • To investigate the specific role of the DSCR1-1S isoform in Interleukin-1 receptor (IL-1R)-mediated signaling.
  • To analyze the interactions between DSCR1-1S and key components of the IL-1R pathway, including Tollip, IRAK-1, and TRAF6.

Main Methods:

  • Co-immunoprecipitation assays were performed in HEK293 cells to study protein interactions.
  • The study analyzed the effects of DSCR1-1S on the formation and dissociation of protein complexes within the IL-1R pathway.
  • Downstream signaling events, including TAK1 activation, NF-kappaB transactivation, and IL-8 production, were measured.

Main Results:

  • DSCR1-1S was found to interact with Tollip, an inhibitor of IRAK-1, causing the dissociation of IRAK-1 from Tollip.
  • Both DSCR1-1S and Tollip interacted with TRAF6, and DSCR1-1S reduced the interaction between Tollip and TRAF6.
  • DSCR1-1S significantly stimulated IL-1R-mediated signaling, including TAK1 activation, NF-kappaB transactivation, and IL-8 production.

Conclusions:

  • The DSCR1-1S isoform plays a positive regulatory role in IL-1R-mediated signaling pathways.
  • DSCR1-1S modulates IL-1R signaling by influencing the complex formation of Tollip, IRAK-1, and TRAF6.
  • These findings elucidate a novel mechanism by which DSCR1 contributes to inflammatory responses.

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