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Original Article
NADPH oxidase depletion in neutrophils from patients with cirrhosis and restoration via toll-like receptor 7/8 activation
  1. Loïc Rolas1,2,3,
  2. Abdelali Boussif1,2,3,4,
  3. Emmanuel Weiss1,2,3,5,
  4. Philippe Lettéron1,2,3,
  5. Oualid Haddad6,
  6. Jamel El-Benna1,2,3,
  7. Pierre-Emmanuel Rautou7,8,
  8. Richard Moreau1,2,3,7,
  9. Axel Périanin1,2,3
  1. 1INSERM UMRS-1149, Faculté de Médecine Xavier Bichat, Paris, France
  2. 2CNRS ERL-8252, Centre de Recherche sur l’Inflammation, Paris, France
  3. 3Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d’Excellence INFLAMEX, Paris, France
  4. 4Département de Biochimie, Université de Batna, Faculté de Biologie, Batna, Algérie
  5. 5Département d’Anesthésie Réanimation, Hôpital Beaujon, APHP, Clichy, France
  6. 6UFR SMBH, Université Paris 13, Sorbonne Paris Cité, Bobigny, France
  7. 7Département Hospitalo-Universitaire (DHU) Unity, Service d’Hépatologie, Hôpital Beaujon, APHP, Clichy, France
  8. 8INSERM U970, Paris Cardiovascular Research Center—PARCC, Paris, France
  1. Correspondence to Dr Axel Périanin, INSERM 1149, Faculté de Médecine Xavier Bichat, 16 rue Henri Huchard, 75018 Paris, France; axel.perianin{at}inserm.fr

Abstract

Objective Cirrhosis downregulates phagocyte oxidant production via their antibacterial superoxide-generating system, NADPH oxidase (NOX2) and increases patients’ susceptibility to infection and mortality rate. To explore novel biochemical parameters that explain susceptibility to infections, we investigated the expression of NOX2 and partners in neutrophils of patients with severe alcoholic cirrhosis and have provided a novel approach to restore superoxide production capacity in patients’ neutrophils and blood.

Design Neutrophils were isolated from patients with decompensated alcoholic cirrhosis. NOX2 activity was assessed after stimulation of purified neutrophils or whole blood with the bacterial-derived peptide fMet-Leu-Phe. The expression of NOX2 and partners was studied by western blot analysis, flow cytometry and reverse transcription-PCR.

Results The impaired superoxide production by patients’ neutrophils was associated with a severe deficient expression of the NADPH oxidase catalytic core flavocytochrome-b558 (gp91phox/NOX2 and p22phox), its cytosolic partner p47phox but not p67phox. NOX2 expression decreased rapidly by protein degradation involving elastase released during degranulation of healthy neutrophils stimulated with fMet-Leu-Phe, or highly present in patients’ plasma. Interestingly, the deficient superoxide production was reversed by treatment of patients’ neutrophils and whole blood with toll-like receptor 7/8 (TLR7/8) agonists. This treatment stimulated a rapid NOX2 transcription and translation through a process involving mammalian target of rapamycin (mTOR) whose expression was also deficient in patients’ neutrophils. NOX2 expression was also increased by the TLR4 agonist lipopolysaccharide but with only a modest improvement of reactive oxygen species production.

Conclusion Impairment of neutrophil oxidants production in alcoholic cirrhosis is associated with NOX2 degradation and deficient mTOR-dependent translational machinery. The NOX2 depletion can be reversed via TRL7/8 activation and might be used to restore antimicrobial responses of immunocompromised patients.

  • Alcoholic hepatitis
  • Neutrophil
  • NOX2 deficiency
  • Restoration
  • TLR7/8

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Footnotes

  • Contributors LR, RM, PER and AP designed the experiments. LR, AB, OH, JEB, PL and AP performed the experiments and analysed the data. EW and RM selected patients and provided blood samples. All authors discussed the results and commented on the manuscript. LR and AP wrote the manuscript.

  • Funding This work was supported by the Labex Inflamex (Fellowship to LR) and by the Algerian Minister of High Education (Fellowship to AB). This work is funded by INSERM and CNRS and the University Paris Diderot.

  • Competing interests None declared.

  • Patient consent Medical and biochemical informations of the study about patients are sufficiently anonymised and do not allow identification of patients.

  • Ethics approval The Inserm ethic commitee ref 2015012778.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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