Production of inflammatory cytokines in ventilator-induced lung injury: a reappraisal

American Journal of Respiratory and Critical Care Medicine
Jean-Damien RicardG Saumon

Abstract

We investigated the production of proinflammatory cytokines by the lung during high mechanical stretch in vivo. To do this, we subjected rats to high-volume (42 ml/kg tidal volume [VT]) ventilation for 2 h. The animals developed severe pulmonary edema and alveolar flooding, with a high protein concentration in bronchoalveolar lavage fluid (BALF). The animals' BALF contained no tumor necrosis factor (TNF)-alpha, negligible amounts of interleukin (IL)-1beta, and less than 300 pg/ml of the chemokine macrophage inflammatory protein (MIP)-2, an amount similar to that found in rats ventilated with 7 ml/kg VT. Systemic cytokine levels were below the detection threshold. Because isolated lungs have been shown to produce high levels of proinflammatory cytokines when ventilated with a similarly high VT for the same duration (Tremblay, et al. J Clin Invest 1997;99:944-952), we reconsidered this specific issue. We ventilated isolated, unperfused rat lungs for 2 h with 7 ml/kg or 42 ml/kg VT, or maintained them in a statically inflated state. Negligible amounts of TNF-alpha were found in the BALF whatever the ventilatory condition applied. The BALF IL-1beta concentration was slightly elevated and higher in lungs ventilated with 42 ml/kg VT ...Continue Reading

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