Functional abnormalities in protein tyrosine phosphatase epsilon-deficient macrophages

Biochem Biophys Res Commun. 2001 Aug 10;286(1):184-8. doi: 10.1006/bbrc.2001.5360.


Protein tyrosine phosphatase epsilon (PTP epsilon)-deficient mice were generated by targeted deletion of exons 3, 4, and 5 of the Ptpre gene. Mice homozygous for this deletion (Ptpre(Delta3-5)) were fertile, bred and developed normally and exhibited no overt phenotype. However, closer examination of the function of macrophages from these mice revealed a defect in the regulation of the respiratory burst. While bacterial lipopolysaccharide (LPS) or tumour necrosis factor alpha (TNFalpha) were able to prime bone marrow-derived macrophages (BMM) from wild type (Ptpre(+)) macrophages for an enhanced respiratory burst, they were unable to do so in macrophages from PTP epsilon-deficient mice. PTP epsilon-deficient BMM also had abnormalities in cytokine production with a reduced ability to produce TNFalpha and enhanced IL-10 production in response to challenge with LPS. These findings suggest an important role for PTP epsilon in the control of macrophage function.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Base Sequence
  • DNA Primers
  • Homozygote
  • Isoenzymes / genetics
  • Isoenzymes / metabolism*
  • Lipopolysaccharides / pharmacology
  • Macrophages / drug effects
  • Macrophages / enzymology*
  • Macrophages / metabolism
  • Mice
  • Phenotype
  • Protein Tyrosine Phosphatases / genetics
  • Protein Tyrosine Phosphatases / metabolism*
  • RNA, Messenger / genetics
  • Tumor Necrosis Factor-alpha / biosynthesis
  • Tumor Necrosis Factor-alpha / pharmacology


  • DNA Primers
  • Isoenzymes
  • Lipopolysaccharides
  • RNA, Messenger
  • Tumor Necrosis Factor-alpha
  • Protein Tyrosine Phosphatases