A New Frontier for In Vitro Biology: Retracing Cell Culture's Path to Organs-on-a-Chip Technology

This abstract reviews the transformative evolution within the field of Cell Culture, the fundamental bedrock of modern Medical Biology, tracing its history from Ross Harrison's pioneering hanging drop method in 1907 to the sophisticated Organs-on-a-Chip (OOC) platforms of today. For over a century, traditional two-dimensional (2D) and static monolayer cultures served as the standard for drug discovery and basic research. However, the primary limitation of these simplistic models lay in their inability to accurately mimic in vivo tissue architecture and the dynamic cellular environment, which necessitated the development of more physiologically relevant three-dimensional (3D) culture systems. This evolution currently culminates in OOC technology, which integrates microfluidic systems to precisely replicate critical physiological parameters, including dynamic flow, mechanical strain, and complex cellular crosstalk. By successfully reconstructing living systems as microphysiological systems (MPS) in the laboratory, OOC offers the closest in vitro approximation of the in vivo state yet achieved. This technological leap holds groundbreaking potential for applications in toxicology screening, precise disease modeling, and personalized medicine, marking the dawn of a new era in biological research. Keywords: Microphysiological Systems (MPS), In Vivo Fidelity, Human-Relevant Models, Tissue Engineering, Biomimicry