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Inhibition of pyroptosis attenuates Staphylococcus aureus-induced bone injury in traumatic osteomyelitis

Xiaobo Zhu1,2, Kaijia Zhang1,2, Ke Lu1,2

  • 1State Key Laboratory of Pharmaceutical Biotechnology, Department of Sports Medicine and Adult Reconstructive Surgery, Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing 210008, China.

Annals of Translational Medicine
|June 7, 2019
PubMed
Abstract

Insights

Pyroptosis, a programmed cell death, is elevated in osteomyelitis. Inhibiting pyroptosis reduces bone destruction caused by Staphylococcus aureus infection, offering a new therapeutic target for this severe bone infection.

Area of Science:

  • Biomedical research
  • Infectious diseases
  • Cellular biology

Background:

  • Osteomyelitis is a severe bone infection characterized by progressive bone resorption and destruction.
  • Pyroptosis, a form of programmed cell death, is implicated in infectious diseases, but its role in osteomyelitis requires clarification.

Purpose of the Study:

  • To investigate the expression of pyroptosis-associated proteins in osteomyelitis.
  • To evaluate the therapeutic potential of inhibiting pyroptosis in Staphylococcus aureus-induced osteomyelitis.

Main Methods:

  • Examined pyroptosis protein (NLRP3, Caspase1, GSDMD) expression in human and murine bone samples using Western blot.
  • Assessed bone destruction via microcomputed tomography (µCT) and inflammatory factors using ELISA.
  • Detected gene expression via RT-qPCR and evaluated pyroptosis inhibition effects in vitro and in vivo.

Main Results:

  • Pyroptosis-associated protein expression was significantly higher in osteomyelitis bone samples and in a S. aureus murine model.
  • Inhibition of pyroptosis alleviated S. aureus-induced pyroptosis, restored bone formation, and attenuated osteoclast activation.
  • Treatment reversed bone injury in vivo.

Conclusions:

  • Pyroptosis is identified as a key pathway in osteomyelitis pathogenesis.
  • Inhibiting pyroptosis demonstrates potential for attenuating S. aureus-induced bone destruction.
  • Targeting pyroptosis presents a promising therapeutic strategy for osteomyelitis treatment.
Keywords:
Osteomyelitisbone destructionosteoblastosteoclastpyroptosis

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