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PTP1B negatively regulates STAT1-independent Pseudomonas aeruginosa killing by macrophages

Lei Yue1, Min Yan2, Shihua Chen2

  • 1The Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, Yunnan, China.

Biochemical and Biophysical Research Communications
|September 22, 2020
PubMed

Insights

Protein tyrosine phosphatase-1B (PTP1B) negatively regulates macrophage response to Pseudomonas aeruginosa infection. PTP1B deficiency enhances bacterial killing and immune signaling, independent of STAT1.

Area of Science:

  • Immunology
  • Microbiology
  • Cell Biology

Background:

  • Pseudomonas aeruginosa is a significant opportunistic pathogen in immunocompromised individuals.
  • The role of macrophages in P. aeruginosa infection response is not fully understood.
  • Protein tyrosine phosphatase-1B (PTP1B) is a key enzyme in cellular signaling.

Purpose of the Study:

  • To investigate the role of PTP1B in macrophage-mediated immune responses to P. aeruginosa.
  • To elucidate the molecular mechanisms by which PTP1B regulates P. aeruginosa infection.

Main Methods:

  • Macrophage cultures and P. aeruginosa infection models.
  • Assessment of bacterial phagocytosis, killing, and lysosome formation.
  • Measurement of nitric oxide (NO) production and inducible nitric oxide synthase (iNOS) expression.
  • Analysis of TRIF-interferon (IFN) pathway cytokine and chemokine production.
  • In vivo studies to confirm findings.

Main Results:

  • PTP1B-deficient macrophages exhibited enhanced phagocytosis and killing of P. aeruginosa.
  • PTP1B deficiency led to increased lysosome formation and nitric oxide production.
  • PTP1B repressed TRIF-IFN pathway signaling, including IFN-β and CXCL10 (IP-10) production.
  • STAT1 phosphorylation was not affected by PTP1B deficiency.
  • In vivo experiments confirmed PTP1B's regulatory role independent of STAT1.

Conclusions:

  • PTP1B acts as a critical negative regulator of macrophage response to P. aeruginosa infection.
  • PTP1B modulates bacterial clearance through mechanisms involving NO production and TRIF-IFN signaling.
  • STAT1 is not required for PTP1B-mediated regulation of P. aeruginosa infection clearance by macrophages.
Keywords:
MacrophageNitric oxidePTP1BPseudomonas aeruginosaSTAT1

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