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Ubiquitin-like protein MNSFβ regulates TLR-2-mediated signal transduction

Morihiko Nakamura1, Jun Watanabe, Natsuko Watanabe

  • 1Department of Cooperative Medical Research, Collaboration Center, Shimane University, Izumo 693-8501, Japan. nkmr0515@med.shimane-u.ac.jp

Molecular and Cellular Biochemistry
|January 26, 2012
PubMed

Insights

Monoclonal nonspecific suppressor factor β (MNSFβ) modification regulates Toll-like receptor 2 (TLR-2) signaling in macrophages. Novel MNSFβ adducts form and may influence TLR-2 pathway activation.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Monoclonal nonspecific suppressor factor β (MNSFβ) post-translational modification regulates cellular processes.
  • MNSFβ interacts with Bcl-G and influences TLR-4 signaling.
  • MNSFβ conjugates to endophilin II, inhibiting pathways upstream of IKK activation, but not TLR-2 signaling.

Purpose of the Study:

  • To investigate the mechanism of MNSFβ in TLR-2-mediated signal transduction.
  • To elucidate the role of MNSFβ in macrophage activation via TLR-2.

Main Methods:

  • Utilized Raw264.7 macrophage-like cell line and BALB/c peritoneal macrophages.
  • Employed small interfering RNA (siRNA) targeting MNSFβ and MNSFβ cDNA.
  • Stimulated cells with Pam(3)CDK(4) (TLR-2 ligand) and lipopolysaccharide (LPS).
  • Analyzed TNFα production and MNSFβ-adduct formation via Western blotting and tyrosine phosphorylation assays.

Main Results:

  • MNSFβ siRNA enhanced Pam(3)CDK(4)-stimulated TNFα production, while Bcl-G siRNA had no effect.
  • MNSFβ cDNA inhibited Pam(3)CDK(4)-stimulated TNFα production.
  • A high-molecular weight (130 kDa) MNSFβ-adduct was specifically induced by Pam(3)CDK(4) stimulation, not LPS.
  • A 40-kDa MNSFβ-adduct was tyrosine phosphorylated upon Pam(3)CDK(4) stimulation.

Conclusions:

  • MNSFβ plays a regulatory role in TLR-2-mediated signaling pathways in macrophages.
  • Novel MNSFβ-adducts are formed in response to TLR-2 activation.
  • These adducts, including a tyrosine-phosphorylated form, may be key mediators in regulating TLR-2 signaling specificity.

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