Volatile Organic Compounds in Cellular Headspace after Hyperbaric Oxygen Exposure: An In Vitro Pilot Study

Area of Science:

• Biochemistry
• Cell Biology
• Toxicology

Background:

• Pulmonary oxygen toxicity (POT) is a concern with hyperbaric and hyperoxic exposures.
• Volatile organic compounds (VOCs) are implicated in oxidative stress pathways.
• Identifying reliable biomarkers for POT is crucial for clinical and operational safety.

Purpose of the Study:

• To identify VOCs associated with oxidative stress in an in vitro model of alveolar basal epithelial cells.
• To evaluate the feasibility of this in vitro model for POT biomarker research.
• To explore the relationship between hyperoxia, oxidative stress, and VOC profiles.

Main Methods:

• Human alveolar basal epithelial cells were exposed to hyperbaric and hyperoxic conditions, mimicking U.S. Navy Treatment Table 6.
• Headspace VOCs were analyzed using gas chromatography-mass spectrometry.
• Cellular stress markers (IL8 and LDH) were measured to confirm cellular injury.

Main Results:

• Significant differences in nonane, octanal, and decane levels were observed between oxygen-exposed and control groups.
• Nonane and decane were previously identified in vivo, strengthening their potential as biomarkers.
• Despite reduced VOC signal intensities in the intervention group, cellular stress markers confirmed significant cell injury.

Conclusions:

• The in vitro model shows promise for investigating POT biomarkers.
• Nonane, octanal, and decane are potential VOC biomarkers for POT-related oxidative stress.
• Further research is needed to elucidate the complex interplay between VOCs and oxidative stress in POT.