Nuno M. Neves

Shi-Cong Tao

Shang-Chun Guo

Wei Seong Toh

Owen Gareth Davies

Existing culture systems have a limited ability to reproduce the complicated and dynamic microenvironment of a functioning organ. To solve the issues of conventional culture techniques, multidisciplinary researchers, involving medical doctors, stem cell and developmental biology experts, engineers and physical scientists, have emerged to innovate methods and devices. A microfluidic organ-on-a-chip (μOOC) is a cell culture device, based on microfluidic technology, which contains continuously perfused chambers with cells to simulate organ-level physiology/pathology. The μOOC is not to build a whole living organ, but rather to synthesize minimal functional units that recapitulate organ-/tissue-level functions. The μOOC can be applied to study not only the convention stimulation on cells by molecular/drugs, but also physical forces (fluid shear stress, cyclic strain and mechanical compression), organ-specific cell-cell intercommunication, and organ-organ coupling responses. There is an emerging need for innovative approaches for the production, control, analysis, and utilization of the μOOC, and even the multiple interconnected μOOC (Human-on-a-Chip). Although the μOOC has attracted much attention and is continuous being studied, there are still many difficult problems to be solved. Some of the most mentioned challenges include microenvironmental (biochemical, biophysical, biomechanical, nutrient, etc.) control, modeling tissue–tissue and multiorgan interactions, and reducing variability (automated control, high-throughput manipulation/analysis, integration of biosensing and etc.).

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