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. 2024 Jan;54(1):e14077.
doi: 10.1111/eci.14077. Epub 2023 Aug 29.

Pneumococcal pneumonia and endotoxemia: An experimental and clinical reappraisal

Jeanne Godon  1 , Pierre-Emmanuel Charles  2   3 , Sylvie Nguyen  3 , Jean-Paul Pais de Barros  4 , Hélène Choubley  4 , Marine Jacquier  2   3 , Jennifer Tetu  5 , Jean-Pierre Quenot  2   3   6 , Maxime Luu  7 , Christine Binquet  6 , David Masson  3 , Lionel Piroth  1   6 , Mathieu Blot  1   3   6 ; Pneumotoxemia study group
Collaborators, Affiliations

Pneumococcal pneumonia and endotoxemia: An experimental and clinical reappraisal

Jeanne Godon et al. Eur J Clin Invest. 2024 Jan.

Abstract

Background: Circulating endotoxins could result from bacterial digestive translocation during sepsis, thus contributing to uncontrolled systemic inflammation, leading in turn to organ dysfunction. We addressed this issue in the setting of severe pneumococcal pneumonia.

Methods: Endotoxemia was measured in a clinically relevant rabbit model of ventilated pneumococcal pneumonia and in 110 patients with bacteraemic pneumonia, using a patented mass spectrometry (LC-MS/MS) method for detection of 3-OH fatty acids (C10, C12, C14, C16 and C18), which are molecules bound to the lipid A motif of LPS.

Results: Whereas higher levels of systemic inflammation and organ dysfunctions were found, there was no significant difference in lipopolysaccharide concentrations when infected rabbits were compared to non-infected ones, or when patients were compared to healthy volunteers.

Conclusions: Seemingly, endotoxins do not drive the overwhelming inflammation associated with severe forms of pneumococcal pneumonia.

Keywords: Streptococcus pneumoniae; endotoxemia; immune response; lipopolysaccharide; pneumonia.

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References

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