Rapid colorimetric assay for cellular growth and survival: Application to proliferation and cytotoxicity assays¶
Why this mattered¶
Mosmann’s 1983 paper mattered because it turned cell proliferation and survival measurement into a rapid, quantitative, plate-based colorimetric assay. By showing that living cells could reduce the yellow tetrazolium salt MTT to a purple formazan product measurable by absorbance, the paper replaced slower, more laborious, and often radioisotope-based approaches with a simple optical readout. This was a practical paradigm shift: cell growth, viability, lymphocyte proliferation, and cytotoxicity could now be measured in many wells at once with standard microplate equipment.
The new possibility was scale. Because the assay was inexpensive, adaptable, and compatible with 96-well formats, it helped make routine high-throughput testing of drugs, toxins, immune responses, and culture conditions feasible. It did not merely improve an existing measurement; it changed the experimental economics of cell biology and immunology by making viability assays faster, safer, and easier to standardize across laboratories.
The paper also established the conceptual template for many later metabolic viability assays: infer living cell number from enzyme-dependent conversion of a soluble reagent into a measurable optical or fluorescent signal. Subsequent tetrazolium and resazurin-based assays, cancer drug screens, cytotoxicity workflows, and pharmacological dose-response studies all built on this logic. Its importance lies in how completely the method became embedded in biomedical research: a small technical paper enabled a generation of scalable experiments linking cell survival to immunology, oncology, toxicology, and drug discovery.
Abstract¶
(no abstract available)