lungonachip

Lung-on-a-chip refers to a microfluidic, cell-based device that recreates key aspects of the human lung's structure and function at a tissue level. It is a leading example of organ-on-a-chip technology, designed to mimic the alveolar-capillary interface where gas exchange occurs. The device typically uses living human cells and a porous, flexible membrane to separate two microchannels, one representing the air-filled alveolar space and the other the adjacent capillary blood flow. The epithelial side is exposed to air, while the endothelial side is perfused with a nutrient medium, and cyclic mechanical stretch is applied to simulate breathing.

In most lung-on-a-chip systems, the upper channel is lined with alveolar epithelial cells and alveolar macrophages, while the lower channel is lined with pulmonary microvascular endothelial cells. A porous, elastic membrane allows communication between compartments and supports gas exchange research. The device often includes air-liquid interface on the epithelial side and can be subjected to controlled airflow, flow rates, and vacuum-driven stretch that reproduces physiological breathing patterns, including frequency and strain. Real-time readouts may include barrier integrity measurements, chemical sensors, and imaging of cellular responses. Some models also incorporate immune cells or inhaled particles to study inflammation, infection, and toxicology.

Applications cover drug discovery, toxicology, and disease modeling. Lung-on-a-chip is used to study alveolar gas exchange, barrier function, and responses to pathogens or aerosols, as well as the pharmacokinetics and toxicity of inhaled drugs. While promising, the technology faces challenges in standardization, scalability, and regulatory acceptance, and it remains a complementary tool rather than a full replacement for animal or whole-organ studies.