The Case of the Insulin Discovery

The Mystery of the Insulin Discovery: An Unexpected Correlation

The year is 1921. The city of Toronto, Canada, breathes an air of scientific optimism. In modest laboratories, a group of researchers was tackling one of the scourges of modern medicine: diabetes. What seemed to be a saga of scientific success, however, hides a veil of mystery that, to this day, intrigues historians of science and curious minds alike. The "Case of the Insulin Discovery" is not a crime in the traditional sense, but rather an intricate puzzle of attributions, recognition, and a possible "theft" of glory, the contours of which have become blurred over time.

The Context and the Incident: A Race Against Time and Death

Diabetes mellitus, at the time, was a death sentence. Without effective treatments, patients withered away, succumbing to the disease within a few years. Hope lay in understanding the role of the pancreas and its internal secretions. Previous research had already suggested the existence of a vital substance produced by the pancreas, provisionally dubbed "insulin," a term derived from the Latin "insula" (island), referring to the "islets of Langerhans," pancreatic structures identified years earlier.

The core of the mystery lies in the rapid and, for some, inexplicable rise of one name to the detriment of others. In 1921, surgeon Frederick Banting, with little experience in endocrinological research, proposed to Dr. John J. R. Macleod, a physiologist at the University of Toronto, that he could isolate this substance from the pancreas. Macleod, although initially skeptical, allocated a laboratory and resources, and assigned a medical student, Charles Best, to assist Banting.

Work began in May 1921. Banting and Best's first attempts were promising. They managed to extract a substance from the pancreas of dogs that, when injected into diabetic dogs, seemed to reduce blood sugar levels. The discovery, however, was not a bolt from the blue. It relied on years of research by other scientists, such as Oskar Minkowski, who in 1889 demonstrated the role of the pancreas in diabetes by removing it from dogs. The issue was not just isolating the substance, but purifying it and making it safe for human use.

Timeline of Events: A Chronology of Discoveries and Disputes

• 1889: Oskar Minkowski and Josef von Mering remove the pancreas from dogs and induce diabetes, confirming its role in the disease.
• Early 1900s: Various scientists investigate the possibility of an internal secretion of the pancreas.
• Late 1920: Frederick Banting conceives his idea of extracting the pancreatic substance.
• April 1921: Banting presents his proposal to Dr. John J. R. Macleod at the University of Toronto.
• May 1921: Macleod grants Banting a laboratory and student Charles Best as an assistant.
• July 1921: Banting and Best obtain the first positive results with pancreatic extracts in dogs.
• Autumn 1921: Macleod returns from vacation and learns of the progress. He authorizes the use of a better-equipped laboratory and the addition of biochemist James Collip to the team.
• December 1921: Collip begins working on the purification of the extract, a crucial step for safety and efficacy.
• January 1922: The first test on a human patient, Leonard Thompson, a 14-year-old boy in a diabetic coma, is performed with the extract purified by Collip. The results are positive.
• July 1922: The team publishes the results of their experiments.
• November 1922: The University of Toronto patents insulin.
• 1923: Frederick Banting and John J. R. Macleod receive the Nobel Prize in Physiology or Medicine for the discovery of insulin. Banting, in protest against the omission of Best, shares his prize money with him. Macleod, in turn, shares his prize with Collip.

The Main Theories: Unraveling the Layers of the Mystery

The mystery of the insulin discovery is not limited to a single question, but to a set of tensions and attributions that have generated various theories and interpretations over the years.

Theory 1: The Official History and Fair Recognition (Dominant Scientific Hypothesis)

This theory maintains that the widely accepted narrative is correct: Banting had the initial idea, Best was a valuable assistant in the experimental phase, Macleod provided the essential structure and scientific support, and Collip was fundamental in the purification, making insulin clinically viable. The Nobel Prize recognized the efforts of Banting and Macleod as project leaders, while Banting included Best and Macleod included Collip in their financial recognition, demonstrating a spirit of collaboration. The logic behind this theory is natural scientific progression, where different individuals contribute distinct skills to a common goal.

Theory 2: The Underestimated Role of Charles Best (Incomplete Recognition Hypothesis)

One of the strongest points of friction is the lack of direct recognition of Charles Best in the Nobel Prize. Proponents of this theory argue that Best, as the main executor of the early-stage experiments, played a much more crucial role than his mention as an "assistant" suggests. The logic is that Best's persistence and skill in conducting complex experiments were the initial engine of the discovery, and his exclusion from the top prize is a historical injustice. Reports from the time indicate that Banting was equally unhappy with Best's exclusion and shared his prize as an act of solidarity.

Theory 3: The Influence of Macleod and the Scientific Structure (Management and Vision Hypothesis)

Although Banting had the original idea, Dr. Macleod's intervention was fundamental. He not only allocated resources but also provided the intellectual structure and necessary laboratories. Some argue that Macleod's vision as department head and his knowledge of physiology were decisive in guiding the research in the right direction and ensuring scientific quality. The logic here is that innovation rarely occurs in a vacuum; scientific management and supervision are indispensable elements for success.

Theory 4: The Primacy of Collip's Work (Essential Purification Hypothesis)

The crude insulin extracted by Banting and Best was toxic. It was James Collip's meticulous work in purifying the extract that made insulin safe for human use. Without his contribution, the discovery might have remained in the experimental field for much longer, or even been discredited due to toxicity. The logic is that scientific discovery is a multifaceted process, and clinical application, which is what truly saves lives, often depends on crucial subsequent contributions.

Theory 5: The Attribution Controversy and the "Race" for Fame (Rivalry and Interest Hypothesis)

Some historians suggest that the dynamics between those involved, especially after the initial success, generated tensions and an implicit "race" for the primary attribution of the discovery. The pressure to publish, obtain patents, and secure international recognition would have led to a narrative that, deliberately or not, minimized the role of some in favor of others. This theory does not point to a specific culprit but suggests an environment of intense scientific competition where glory could overshadow full collaboration. Declassified files and personal correspondence from the time may contain clues about these dynamics.

Theory 6: The Legacy of Ignored Previous Researchers (Historical Debt Hypothesis)

This theory, while not directly linked to the 1921 incident, addresses the broader context. It is argued that the discovery of insulin, like many scientific discoveries, did not arise from nothing but was based on decades of work by various researchers whose names are not as prominent as those of Banting, Best, Macleod, and Collip. The logic is that the history of science often simplifies narratives, focusing on the final protagonists and forgetting the knowledge base built by others.

Controversies and Blind Spots: The Shadows of the Discovery

Despite the monumental impact of insulin, the path to its recognition and the narrative of the discovery were not free of controversy. The main one revolves around the attribution of the discovery and recognition.

• The Exclusion of Charles Best from the Nobel Prize: This is undoubtedly the most sensitive point. While Banting and Macleod were honored, Best, despite his crucial role in the initial experiments, was left out. Official reports from the Nobel Committee are notoriously succinct, and the exact justification for Best's exclusion remains in debate. Banting tried to mitigate this by sharing his prize, but the initial omission is a blind spot for many historians.
• The Role of James Collip: Similarly, Collip, whose expertise in biochemistry was essential for the purification of insulin and its clinical application, was also not directly awarded the Nobel, but was included in Macleod's prize. The narrative may have focused more on the "idea" and the "initial demonstration" than on the scientific "engineering" work that made it useful.
• The Lack of Transparency in Nobel Decision Processes: The Nobel Committee's archives, although gradually declassified, do not always provide a complete picture of the deliberations. The absence of detailed testimonies from those involved or explicit justifications for the omissions leaves room for speculation.
• Incomplete or Lost Laboratory Records: In any investigation, the integrity of records is fundamental. Although Banting and Best kept diaries and notes, the availability and integrity of all relevant documents over the years can be a blind spot.
• Divergent Interpretations of Testimonies: Over time, memories and interpretations of events can diverge. Testimonies collected years after the discovery may have been influenced by resentment, delayed recognition, or simply the passage of time.

Curiosities and Legacy: The Silent Revolution

The "Case of the Insulin Discovery" is, in fact, a testament to the power of scientific collaboration, but also to the complexities and disputes over recognition that can arise in this field.

• Cultural Impact: The discovery of insulin was a watershed moment in the history of medicine. It transformed diabetes from a fatal disease into a manageable chronic condition. The cultural impact is immeasurable, saving millions of lives and allowing people with diabetes to live full and productive lives.
• The Legacy of Collaboration: Despite the controversies over attribution, the case highlights the importance of teamwork. The combination of Banting's ideas, Best's experimental execution, Macleod's guidance, and Collip's expertise demonstrates how different skills converge toward a common goal.
• Current Status: The case, in the sense of a criminal investigation, does not exist. However, the academic and historical debate about "justice" in the recognition of those involved persists. The history of the insulin discovery continues to be studied, debated, and reinterpreted by historians of science. The University of Toronto and the Banting and Best Department of Medical Research continue to honor the legacy of the discovery.
• The Continuation of Research: The discovery of insulin opened doors to decades of diabetes research, leading to the development of different types of insulin, administration methods, and therapeutic approaches, showing that the "discovery" is only the first step in a long process of scientific advancement.

The "Case of the Insulin Discovery" reminds us that the history of science is as human as it is scientific, permeated by ambitions, challenges, and the eternal search for understanding and recognition. The mystery does not lie in the substance itself, but in the intricate human relationships and disputes for glory that shaped the narrative of one of the most important medical discoveries of all time.