Scientific Studies
An article he read about the pancreas piqued Banting's interest in diabetes. Research by Naunyn, Minkowski, Opie, Schafer, and others suggested that diabetes resulted from a lack of a protein hormone secreted by the islets of Langerhans in the pancreas. Schafer had named this hormone insulin. Insulin was thought to control the metabolism of sugar; its lack led to an increase of sugar in the blood which was then excreted in urine. Attempts to extract insulin from ground-up pancreas cells were unsuccessful, likely because of the destruction of the insulin by the proteolytic enzyme of the pancreas. The challenge was to find a way to extract insulin from the pancreas prior to its being destroyed.
Moses Barron published an article on experimental closure of the pancreatic duct by ligature which further influenced Banting's thinking. The procedure caused deterioration of the cells of the pancreas that secrete trypsin but left the islets of Langerhans intact. Banting realized that this procedure would destroy the trypsin-secreting cells but not the insulin. Once the trypsin-secreting cells had died, insulin could be extracted from the islets of Langerhans. Banting discussed this approach with J. J. R. Macleod, Professor of Physiology at the University of Toronto. Macleod provided experimental facilities and the assistance of one of his students, Dr. Charles Best. Banting and Best began the production of insulin by this means.
Banting was appointed Senior Demonstrator in Medicine at the University of Toronto in 1922. The following year he was elected to the new Banting and Best Chair of Medical Research, endowed by the Legislature of the Province of Ontario. He also served as Honorary Consulting Physician to the Toronto General, the Hospital for Sick Children, and the Toronto Western Hospital. At the Banting and Best Institute, he researched silicosis, cancer, and the mechanisms of drowning. During the Second World War he investigated the problems of aviators, such as "blackout" (syncope).
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