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Absence or inhibition of matrix metalloproteinase-8 decreases ventilator-induced lung injury

Guillermo M Albaiceta1, Ana Gutierrez-Fernández, Emilio García-Prieto

  • 1Department of Biología Funcional, Universidad de Oviedo, Instituto Universitario de Oncología del Principado de Asturias, Oviedo, Spain. guillermo.muniz@sespa.princast.es

American Journal of Respiratory Cell and Molecular Biology
|December 10, 2009
PubMed

Insights

Matrix metalloproteinase-8 (MMP-8) drives lung inflammation during mechanical ventilation. Inhibiting MMP-8 reduces ventilator-induced lung injury (VILI) by improving lung function and decreasing inflammation.

Area of Science:

  • Pulmonary Medicine
  • Immunology
  • Biochemistry

Background:

  • Mechanical ventilation, while life-saving, can cause lung damage, known as ventilator-induced lung injury (VILI).
  • VILI is associated with inflammation and the upregulation of matrix metalloproteinases (MMPs).
  • MMP-8 plays a role in initiating inflammation by modifying immune mediators.

Purpose of the Study:

  • To investigate the role of MMP-8 in a VILI model.
  • To determine if MMP-8 is a viable therapeutic target for mitigating VILI.

Main Methods:

  • Ventilation of wild-type and MMP-8-deficient mice with high or low pressures.
  • Assessment of lung injury, gas exchange, edema, and permeability.
  • Analysis of immune cell infiltration and cytokine profiles in lung tissue and bronchoalveolar lavage fluid.
  • Treatment of wild-type mice with a selective MMP-8 inhibitor.

Main Results:

  • High-pressure ventilation caused lung injury in wild-type mice, but MMP-8 deficiency protected against this injury.
  • MMP-8 deficient mice showed improved gas exchange, reduced lung edema and permeability, and less histological damage.
  • Lack of MMP-8 altered the immune response, decreasing neutrophils, IFN-γ, and certain chemokines, while increasing anti-inflammatory cytokines IL-4 and IL-10.
  • Selective MMP-8 inhibition mimicked the protective effects observed in MMP-8 deficient mice.

Conclusions:

  • MMP-8 significantly contributes to acute lung inflammation and injury during high-pressure mechanical ventilation.
  • Short-term inhibition of MMP-8 is a potential therapeutic strategy to limit VILI.

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