Phosphatase PTP1B negatively regulates MyD88- and TRIF-dependent proinflammatory cytokine and type I interferon production in TLR-triggered macrophages

Mol Immunol. 2008 Aug;45(13):3545-52. doi: 10.1016/j.molimm.2008.05.006. Epub 2008 Jun 20.


Toll-like receptors (TLRs) are primary sensors to detect conserved patterns on microorganisms, thus acting as the important components of innate immunity against invading pathogens. Protein tyrosine phosphatase-1B (PTP1B) has been shown to be a critical negative regulator of insulin pathway and other cellular signaling, however, whether and how PTP1B regulates TLR-triggered innate response remain to be investigated. We report here that PTP1B can markedly decrease TNF-alpha, IL-6 and IFN-beta production by macrophages stimulated with LPS, CpG ODN, or Poly I:C. Accordingly, knockdown of endogenous PTP1B expression increases production of TNF-alpha, IL-6 and IFN-beta in macrophages stimulated with TLR ligands. Phosphatase activity-disrupted mutant PTP1B cannot inhibit TLR-triggered production of proinflammatory cytokines and IFN-beta, indicating PTP1B exerts its suppressive activity in phosphatase-dependent manner. PTP1B inhibits TLR ligands-induced activation of MAPKs, NF-kappaB, and IRF3, furthermore, co-transfection of PTP1B inhibits both MyD88- and TRIF-induced transcription of TNF-alpha and IFN-beta reporter genes in a dose-dependent manner. In addition, PTP1B inhibits LPS-induced Tyk2 and STAT1 activation. Therefore, we demonstrate that phosphatase PTP1B is a physiological negative regulator of TLR signaling via suppression of both MyD88- and TRIF-dependent production of proinflammatory cytokine and IFN-beta in macrophages. Our results provide new mechanistic explanation for negative regulation TLR response and suggest PTP1B as a potential target for the intervention of the inflammatory diseases.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adaptor Proteins, Vesicular Transport / metabolism*
  • Animals
  • Cells, Cultured
  • Cytokines / metabolism
  • Down-Regulation
  • Humans
  • Inflammation Mediators / metabolism*
  • Interferon Type I / metabolism*
  • Macrophage Activation / immunology
  • Macrophages / immunology*
  • Macrophages / metabolism
  • Mice
  • Myeloid Differentiation Factor 88 / metabolism*
  • Protein Tyrosine Phosphatase, Non-Receptor Type 1 / physiology*
  • Signal Transduction / immunology
  • Toll-Like Receptors / immunology
  • Toll-Like Receptors / metabolism


  • Adaptor Proteins, Vesicular Transport
  • Cytokines
  • Inflammation Mediators
  • Interferon Type I
  • Myeloid Differentiation Factor 88
  • TICAM1 protein, human
  • Toll-Like Receptors
  • PTPN1 protein, human
  • Protein Tyrosine Phosphatase, Non-Receptor Type 1