Gastrointestinal gas-liquid interface

The gastrointestinal gas-liquid interface refers to the boundary at the apical surface of intestinal epithelial cells where gas (primarily oxygen) meets liquid (mucus and luminal contents), critical for mimicking physiological conditions in vitro. This interface maintains low oxygen levels to support anaerobic microbiota while enabling epithelial cell viability and functions like barrier integrity and host-microbe interactions. In models such as air-liquid interface (ALI) cultures, it enhances oxygen availability at the cell surface, promoting oxidative phosphorylation over glycolysis, reducing HIF-1α activity, and improving metabolic profiles akin to in vivo intestine. It facilitates long-term co-cultures with obligate anaerobes like Clostridioides difficile and Bacteroides fragilis, allowing study of colonization, persistence post-antibiotic treatment, and mucosal responses. Though not a molecular therapeutic target like receptors or enzymes, disruptions at this interface contribute to dysbiosis and infections, with research focusing on microphysiological systems for drug testing rather than direct modulation. No approved drugs specifically target this interface; instead, it serves as a platform to evaluate antibiotics like vancomycin in realistic anaerobic environments.

Other names

air-liquid interface (ALI)gas-rich liquid-liquid interface