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Accueil > A propos du LPP > Communication > Actualités archivées > 2022 > Océane Blaise defended her PhD "Cold atmospheric plasma improves bactericidal activity and stimulates phagosome maturation of macrophages"

Océane Blaise defended her PhD "Cold atmospheric plasma improves bactericidal activity and stimulates phagosome maturation of macrophages"

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On Thursday December 1, 2022, Océane Blaise defended her PhD "Cold atmospheric plasma improves bactericidal activity and stimulates phagosome maturation of macrophages".

Abstract :
Management of thermal burn-injured patients is a challenging field for care units with millions of adults and children concerned worldwide. Important advances over the past decade have occurred in resuscitation, burn wound management or reconstruction. However, patients with severe burns still face disabling consequences such as hypertrophic scars and a high risk of infections and sepsis. Cold atmospheric plasma (CAP) is a partially ionised gas delivering a mixture of reactive oxygen and nitrogen species which favour wound healing and have antimicrobial properties.
This PhD study aimed to understand the underlying mechanisms that are responsible for beneficial effects during wound infections specifically on macrophages immune cells. First, we demonstrated in vitro that CAP treatment resulted in a significant decrease in bacterial load for two types of Staphylococcus aureus strains (methicillin-resistant and sensitive : MSSA, MRSA) during their internalization by macrophages. Then, we shown that the enhancement killing of S. aureus by macrophages is mediated by oxidative mechanisms and that CAP promotes phagosome maturation into acidic degradative vesicle. Second, we reported a positive correlation between antibacterial action of CAP and activation of phagocyte NADPH oxidase (NOX2) machinery in two and three-dimensional models of cutaneous infection.
In addition, to its antimicrobial effects, CAP is a positive regulator of cutaneous wound healing as shown in an in vivo murine mouse model infected with S. aureus. Finally, the ultimate goal of the project is to treat either uninfected or infected full-thickness burn wounds. Thus, a plasma device has been developed to treat wounds with large surface area. For the first time, this new prototype will be used in porcine model of full-thickness burn wound reconstructed with partial-thickness allografts. This study demonstrated the therapeutic potential of CAP on infected tissue repair. Investigation on tissue repair are promising and further investigations and will be completed by other studies.

Jury :
* Elisa Gomez Perdiguero, Institut Pasteur (Rapporteur)
* Sander Bekeschus, Institut Leibniz pour la science et la technologie du plasma (Rapporteur)
* Ludovic Tailleux, Institut Pasteur (Examinateur)
* Colin McGuckin, CtiBiotech (Examinateur)
* Marina Trouillas, Centre de transfusion sanguine des armées Percy (Examinatrice)
* Antoine Rousseau, Laboratoire de Physique des plasmas LPP (directeur de thèse, membre invité)
* Sébastien Banzet, Centre de transfusion sanguine des armées Percy (co-directeur de thèse)
* Nadira Frescaline, Institut Pasteur (encadrante)
* Emmanuelle Guillot-Combe, DGA (invitée)

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Exploitant du site : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Hébergeur : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Directeur de la publication : Anne Bourdon (Directrice)

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