Every generation of mammalian cell culture has solved one biological challenge while revealing the next. The earliest researchers sought to keep living cells alive outside the body, opening a new window into biology and medicine. As these techniques matured, demand grew for scalable culture systems capable of producing cells for vaccines, biologics and regenerative medicine. Yet increasing cell numbers was only part of the challenge, as attention also turned towards recreating the physical, biochemical and mechanical cues that shape cellular behaviour within human tissues. This pursuit drove the development of microcarriers for scalable cell expansion, hydrogels for recreating the cellular microenvironment and microfluidic systems for introducing dynamic culture conditions, laying the foundation for more human-relevant in vitro models with the potential to reduce reliance on animal models.
The Beginning: Learning to Culture Living Cells
Modern biotechnology owes much of its success to the ability to maintain mammalian cells outside the body. Before reliable culture techniques were established, biological processes were studied mainly in whole organisms or fixed tissue samples. This limited the ability to examine cellular behaviour under controlled conditions. Mammalian cell culture changed that by allowing living cells to be observed and manipulated directly. It soon became a foundational tool across the life sciences.
The transition was not straightforward. Early work was constrained by sterility, media formulation and the difficulty of maintaining cells over extended periods. Improvements in sterile technique, specialised culture media, incubator technology and cell line development transformed cell culture from a specialised method into a routine laboratory tool.1 This progress accelerated discoveries in developmental biology, immunology, cancer research and molecular medicine. Cultured cells also became increasingly important for biotechnology.
