Symptoms and Early Observations
Diabetes Mellitus, characterized by excessive urination, thirst, and weight loss, was recognized by ancient Egyptians, Greeks, and Indians. Its sweet urine was noted, but effective treatment remained elusive for millennia, often leading to early death.
Pancreas's Role Discovered
German physicians Oskar Minkowski and Joseph von Mering demonstrated that removing the pancreas from dogs induced severe diabetes. This crucial experiment established the organ's vital role in regulating blood sugar, setting the stage for future discoveries.
Early Research and Hypotheses
Various researchers across Europe and North America, including Edward Albert Sharpey-Schafer, hypothesized that the pancreas produced a specific substance (which he called "insulin") that regulated blood sugar. However, isolating and purifying this substance proved incredibly challenging.
Insulin Isolated by Banting & Best
Frederick Banting, a surgeon, and Charles Best, a medical student, working under the supervision of John Macleod at the University of Toronto, successfully isolated an extract from dog pancreases that lowered blood sugar in diabetic dogs. They initially called it "isletin".
First Human Treatment
14-year-old Leonard Thompson, critically ill with diabetes, received the first insulin injection. Initial purity issues caused an allergic reaction, but a refined extract developed by biochemist James Collip soon led to dramatic improvement, saving his life and proving insulin's efficacy.
Mass Production and Global Impact
Recognizing the immense potential, the University of Toronto swiftly partnered with Eli Lilly and Company for large-scale production. Insulin quickly became available worldwide, transforming diabetes from a rapidly fatal disease into a manageable condition, saving countless lives.
Nobel Prize Awarded
Frederick Banting and John Macleod were jointly awarded the Nobel Prize in Physiology or Medicine for the discovery of insulin. Banting shared his prize money with Best, and Macleod shared his with Collip, acknowledging the team's crucial contributions.
Advancements in Diabetes Management
Continuous research led to purified insulins, synthetic human insulin (via recombinant DNA technology in the 1970s), long-acting analogues, insulin pens, pumps, and continuous glucose monitoring, drastically improving the quality of life and longevity for millions living with diabetes.