Serge Voronoff - Monkey-gland Transplant Work

Monkey-gland Transplant Work

In the late nineteenth century and early twentieth century, trends in xenotransplantation included the work of Charles-Édouard Brown-Séquard. In 1889, Voronoff injected himself under the skin with extracts from ground-up dog and guinea pig testicles. These experiments failed to produce the desired results of increased hormonal effects to retard aging.

Voronoff's experiments launched from this starting point. He believed glandular transplants would produce more sustained effects than mere injections. Voronoff's early experiments in this field included transplanting thyroid glands from chimpanzees to humans with thyroid deficiencies. He moved on to transplanting the testicles of executed criminals into millionaires, but, when demand outstripped supply, he turned to using monkey testicle tissue instead.

Between 1917 and 1926, Voronoff carried out over five hundred transplantations on sheep and goats, and also on a bull, grafting testicles from younger animals to older ones. Voronoff's observations indicated that the transplantations caused the older animals to regain the vigor of younger animals. He also considered monkey-gland transplantation an effective treatment to counter senility.

His first official transplantation of a monkey gland into a human took place on June 12, 1920. Thin slices (a few millimetres wide) of testicles from chimpanzees and baboons were implanted inside the patient's scrotum, the thinness of the tissue samples allowing the foreign tissue to fuse with the human tissue eventually. By 1923, 700 of the world's leading surgeons at the International Congress of Surgeons in London, England, applauded the success of Voronoff's work in the "rejuvenation" of old men.

In his book Rejuvenation by Grafting (1925), Voronoff describes what he believes are some of the potential effects of his surgery. While "not an aphrodisiac", he admits the sex drive may be improved. Other possible effects include better memory, the ability to work longer hours, the potential for no longer needing glasses (due to improvement of muscles around the eye), and the prolonging of life. Voronoff also speculates that the grafting surgery might be beneficial to people with "dementia praecox", the mental illness known today as schizophrenia.

Voronoff's monkey-gland treatment was in vogue in the 1920s. The poet E. E. Cummings sang of a "famous doctor who inserts monkeyglands in millionaires", and Chicago surgeon Max Thorek, for whom the Thorek Hospital and Medical Center is named, recalled that soon, "fashionable dinner parties and cracker barrel confabs, as well as sedate gatherings of the medical élite, were alive with the whisper - 'Monkey Glands'."

By the early 1930s, over 500 men had been treated in France by his rejuvenation technique, and thousands more around the world, such as in a special clinic set up in Algiers. Noteworthy people who had the surgery included Harold McCormick, chairman of the board of International Harvester Company, and the aging President of Turkey Mustafa Kemal Atatürk. To cope with the demand for the operation, Voronoff set up his own monkey farm on the Italian Riviera, employing a former circus-animal keeper to run it. French-born U.S. coloratura soprano Lily Pons was a frequent visitor to the farm. With his growing wealth, Voronoff occupied the whole of the first floor of one of Paris's most expensive hotels, surrounded by a retinue of chauffeurs, valets, personal secretaries and two mistresses.

Voronoff's later work included transplants of monkey ovaries into women. He also tried the reverse experiment, transplanting a human ovary into a female monkey, and then tried to inseminate the monkey with human sperm. The notoriety of this experiment resulted in the novel Nora, la guenon devenue femme (Nora, the Monkey Turned Woman) by Félicien Champsaur. In 1934, he was the first to officially recognise scientific work done by Greek Professor Skevos Zervos.