Radiation-induced reactive oxygen species partially assemble neutrophil NADPH oxidase
| Autor: | Laura Baciou, Sophie Dupré-Crochet, Chantal Houée-Levin, Kwasi Preko, Tania Bizouarn, Eric Clement Desmond Kotei Addison, Stephenson B. Owusu, Céline Ferard, Elodie Hudik |
|---|---|
| Přispěvatelé: | Laboratoire de Chimie-Physique (LCP), Université de Cocody, Institut de Chimie Physique (ICP), Institut de Chimie du CNRS (INC)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Kwame Nkrumah University of Science and Technology [GHANA] (KNUST) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0301 basic medicine
Neutrophils Phagocytosis [SDV]Life Sciences [q-bio] medicine.disease_cause [SDV.IMM.II]Life Sciences [q-bio]/Immunology/Innate immunity Biochemistry 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Superoxides NADPH oxidase complex Physiology (medical) medicine Humans ComputingMilieux_MISCELLANEOUS chemistry.chemical_classification Reactive oxygen species Radiation Innate immune system NADPH oxidase biology Chemistry Superoxide NADPH Oxidases ROS Hydrogen Peroxide Phosphoproteins Superoxide radical Cell biology 030104 developmental biology Enzyme Ionizing radiation biology.protein Reactive Oxygen Species 030217 neurology & neurosurgery Oxidative stress |
| Zdroj: | Free Radical Biology and Medicine Free Radical Biology and Medicine, Elsevier, 2021, 164, pp.76-84. ⟨10.1016/j.freeradbiomed.2020.12.233⟩ |
| ISSN: | 0891-5849 |
| DOI: | 10.1016/j.freeradbiomed.2020.12.233⟩ |
| Popis: | International audience; Neutrophils are key cells from the innate immune system that destroy invading bacteria or viruses, thanks mainly to the non-mitochondrial reactive oxygen species (ROS) generated by the enzyme NADPH oxidase. Our aim was to study the response of neutrophils to situations of oxidative stress with emphasis on the impact on the NADPH oxidase complex. To mimic oxidative stress, we used gamma irradiation that generated ROS (OH•, O2•- and H2O2) in a quantitative controlled manner. We showed that, although irradiation induces shorter half-lives of neutrophil (reduced by at least a factor of 2), it triggers a pre-activation of surviving neutrophils. This is detectable by the production of a small but significant amount of superoxide anions, proportional to the dose (about 3 times that of sham). Investigations at the molecular level showed that this ROS increase was generated by the NADPH oxidase enzyme after neutrophils irradiation. The NADPH oxidase complex undergoes an incomplete assembly which includes p47phox and p67phox but excludes the G-protein Rac. Importantly, this irradiation-induced pre-activation is capable of considerably improving neutrophil reactivity. Indeed, we have observed that this leads to an increase in the production of ROS and the capacity of phagocytosis, leading to the conclusion that radiation induced ROS clearly behave as neutrophil primers. |
| Databáze: | OpenAIRE |
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