Advances in Oxygen Therapy with a Special Focus on Immunomodulation and Infection

A special issue of Biomolecules (ISSN 2218-273X). This special issue belongs to the section "Molecular Medicine".

Deadline for manuscript submissions: closed (30 October 2023) | Viewed by 2369

Special Issue Editor


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Guest Editor
1. Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
2. Department of Anaesthesiology, Head-and-Orthopedic Centre, Copenhagen University Hospital—Rigshospitalet, Copenhagen, Denmark
Interests: the use of adjuvant HBOT in soft tissue and bony radiation injuries, ischemic wounds, diabetic foot ulcers, severe necrotizing soft tissue infections, and infections involving biofilm formation; decompression sickness and altitude decompression sickness; effects of oxygen on neurorehabilitation; effects of normobaric hypoxia and hyperoxia

Special Issue Information

Dear Colleagues,

Since the discovery and the subsequent mapping of the cell’s universal oxygen sensing mechanisms, now almost three decades ago, an increasingly large body of scientific evidence has emerged on the effects of oxygen fluctuation levels (i.e., DPO2 changes during both hypoxia and hyperoxia and hypo-, normo-, and hyperbaric pressure) under different pathophysiological conditions. It thus follows that oxygen availability and rapid changes or fluctuations thereof are an important signal transmitter including changes in hypoxia-induced factors (HIFs) and target genes. The key word is intermittent oxygen changes in contrast to long-term ones, involving several hours of continued normobaric oxygen breathing, where unwanted side effects may become more evident. Intermittent hyperbaric hyperoxia has been shown to stimulate wound healing, correct tissue ischemia and hypoxia, and, through controlled bursts of oxidative stress, induce regulation of bacterial metabolism and enhance certain antibiotics in the attempt to gain infection control. However, effects may be dependent on the sequence of events and timing of oxygen dosage. More research is clearly in demand, both with respect to pre-clinical, pathophysiological studies providing mechanistic insight into the many stimulating effects of cellular oxygen fluctuations and also with respect to human data and clinical trials investigating its impact on human disease outcome. In this Special Issue of Biomolecules, the focus will be on the effects of intermittent and fluctuating oxygen levels. The areas of interest may include but are not exclusively limited to:

  • Hyperoxic (normo- and hyperbaric) fluctuations as a potential regulator as cellular oxygen sensing including hypoxia-induced factor (HIF) transcription;
  • Hyperoxia fluctuations as an immune modulating stimulus in tissue infections;
  • Hyperoxia as a regulator of bacterial metabolism and antibiotic susceptibility to bacterial killing mechanisms during biofilm formation in tissue infections.

In this context, we welcome original research, experimental in vitro or in vivo pathophysiological pre-clinical studies, as well as clinical reports—either retrospective, prospective or randomized trials—as well as systematic or narrative reviews to enhance scientific knowledge and distribution of new innovative ideas within the field of oxygen research.

Prof. Dr. Ole Hyldegaard
Guest Editor

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Keywords

  • oxygen
  • hyperoxia
  • hyperbaric
  • normobaric
  • biofilm
  • immune modulation
  • sepsis
  • septic shock
  • infection

Published Papers (1 paper)

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Review

19 pages, 1208 KiB  
Review
The Mechanisms of Action of Hyperbaric Oxygen in Restoring Host Homeostasis during Sepsis
by Julie Vinkel, Bjoern Arenkiel and Ole Hyldegaard
Biomolecules 2023, 13(8), 1228; https://doi.org/10.3390/biom13081228 - 7 Aug 2023
Cited by 3 | Viewed by 2144
Abstract
The perception of sepsis has shifted over time; however, it remains a leading cause of death worldwide. Sepsis is now recognized as an imbalance in host cellular functions triggered by the invading pathogens, both related to immune cells, endothelial function, glucose and oxygen [...] Read more.
The perception of sepsis has shifted over time; however, it remains a leading cause of death worldwide. Sepsis is now recognized as an imbalance in host cellular functions triggered by the invading pathogens, both related to immune cells, endothelial function, glucose and oxygen metabolism, tissue repair and restoration. Many of these key mechanisms in sepsis are also targets of hyperbaric oxygen (HBO2) treatment. HBO2 treatment has been shown to improve survival in clinical studies on patients with necrotizing soft tissue infections as well as experimental sepsis models. High tissue oxygen tension during HBO2 treatment may affect oxidative phosphorylation in mitochondria. Oxygen is converted to energy, and, as a natural byproduct, reactive oxygen species are produced. Reactive oxygen species can act as mediators, and both these and the HBO2-mediated increase in oxygen supply have the potential to influence the cellular processes involved in sepsis. The pathophysiology of sepsis can be explained comprehensively through resistance and tolerance to infection. We argue that HBO2 treatment may protect the host from collateral tissue damage during resistance by reducing neutrophil extracellular traps, inhibiting neutrophil adhesion to vascular endothelium, reducing proinflammatory cytokines, and halting the Warburg effect, while also assisting the host in tolerance to infection by reducing iron-mediated injury and upregulating anti-inflammatory measures. Finally, we show how inflammation and oxygen-sensing pathways are connected on the cellular level in a self-reinforcing and detrimental manner in inflammatory conditions, and with support from a substantial body of studies from the literature, we conclude by demonstrating that HBO2 treatment can intervene to maintain homeostasis. Full article
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