Juda Hirsch Quastel

1899 - 1987

Juda Hirsch Quastel (1899–1987): Architect of Modern Neurochemistry

Juda Hirsch Quastel was a polymathic biochemist whose work bridged the gap between the fundamental chemical processes of life and the clinical realities of medicine and agriculture. A pioneer of "dynamic biochemistry," Quastel is best remembered for his foundational work on enzyme inhibition, brain metabolism, and soil microbiology. His career spanned two continents and several scientific revolutions, leaving an indelible mark on how we understand the living cell.

1. Biography: From Sheffield to the Pacific Coast

Juda Hirsch Quastel was born on October 2, 1899, in Sheffield, England. His early education was interrupted by World War I, during which he served in the British Army’s anti-gas service—an experience that perhaps sparked his lifelong interest in the physiological effects of chemicals.

Education and Early Career:

After the war, Quastel attended the University of Sheffield, earning his Bachelor of Science in 1921. He then moved to Cambridge University, joining the laboratory of the legendary Sir Frederick Gowland Hopkins, the "father of British biochemistry." Under Hopkins, Quastel flourished, earning his PhD in 1924 and a Doctor of Science (ScD) in 1930. He was elected a Fellow of Trinity College, Cambridge, a prestigious appointment that signaled his rising status in the scientific community.

The Cardiff and War Years:

In 1929, Quastel took a bold step by becoming the Director of Research at the Cardiff City Mental Hospital. While an unusual move for a pure biochemist, it allowed him to apply biochemical rigor to psychiatric illness. During World War II, his expertise was diverted to the Agricultural Research Council, where he led a team at Rothamsted Experimental Station focusing on soil fertility and crop production.

The Canadian Chapter:

In 1947, Quastel emigrated to Canada to become the Director of the McGill University-Montreal General Hospital Research Institute. Over the next 20 years, he transformed Montreal into an international hub for neurochemistry. In 1966, rather than retiring, he moved to the University of British Columbia (UBC) as a Professor of Neurobiology and later a Professor of Psychiatry, where he continued to research and mentor until his death in 1987.

2. Major Contributions: Enzymes, Brains, and Soil

Quastel’s research was characterized by a "whole-system" approach, looking at how molecules behaved within intact tissues rather than just in test tubes.

Discovery of Competitive Inhibition: In 1925, Quastel and B. Woolf made a discovery that is now a cornerstone of pharmacology. While studying the enzyme succinic dehydrogenase, they found that malonate (a molecule shaped similarly to the enzyme’s natural substrate, succinate) could "clog" the enzyme’s active site. This was the first demonstration of competitive inhibition. This principle allowed scientists to design drugs that mimic natural substances to block specific biological pathways.
Founder of Neurochemistry: Before Quastel, the brain was often viewed as a "black box." In the 1930s, he pioneered the use of brain slices to study respiration. He was the first to prove that the brain relies almost exclusively on the oxidation of glucose for energy. He also conducted seminal research on how narcotics and anesthetics inhibit brain respiration, providing a chemical basis for anesthesia.
The "Living Organ" Theory of Soil: Quastel revolutionized agriculture by treating soil as a living, breathing organ. He developed techniques to study the metabolic activity of soil microbes in situ. His work led to the development of synthetic soil conditioners (like Krilium) and the discovery of the herbicidal properties of phenoxyacetic acids (such as 2,4-D).
Acetylcholine Synthesis: He made significant contributions to understanding how the neurotransmitter acetylcholine is synthesized in the brain, linking metabolic energy (ATP) to the transmission of nerve impulses.

3. Notable Publications

Quastel was a prolific writer, authoring or co-authoring over 400 scientific papers. His most influential works include:

"Dehydrogenations Produced by Resting Bacteria" (1924/1925): Published in the Biochemical Journal, these papers laid the groundwork for microbial biochemistry and enzyme kinetics.
"The Action of Dyestuffs on Enzymes" (1924): An early exploration of how chemical structures interact with biological catalysts.
"Respiration in the Central Nervous System" (1932): A landmark paper in Physiological Reviews that established the parameters of brain metabolism.
"The Chemistry of Brain Metabolism in Health and Disease" (1961): A definitive monograph that synthesized decades of research into a clinical framework.
"Neurochemistry" (1955; 1962): Co-edited with Elliott and Page, this was the first comprehensive textbook in the field, effectively codifying neurochemistry as a distinct discipline.

4. Awards & Recognition

Quastel’s contributions were recognized by the highest scientific bodies in the Commonwealth and beyond:

Fellow of the Royal Society (FRS) (1940): Elected at the relatively young age of 40.
Fellow of the Royal Society of Canada (1952).
Companion of the Order of Canada (1970): Canada’s highest civilian honor, awarded for his contributions to science and education.
Gairdner Foundation International Award (1974): Often seen as a precursor to the Nobel Prize, awarded for his work on brain metabolism.
Honorary Degrees: He received honorary doctorates from the Hebrew University of Jerusalem, McGill University, and the University of British Columbia.

5. Impact & Legacy

Medical Pharmacology: Every modern drug that functions as an enzyme inhibitor (from statins to ACE inhibitors) owes a debt to Quastel’s discovery of competitive inhibition.
Biological Psychiatry: By showing that mental states and the effects of drugs have a quantifiable biochemical basis, he helped move psychiatry away from purely speculative models toward a hard-science approach.
Environmental Science: His work on selective toxicity in plants paved the way for modern herbicides, though he remained concerned about the ecological implications of chemical use in farming.

6. Collaborations

Quastel was a deeply collaborative scientist who believed in the cross-pollination of ideas:

Sir Frederick Gowland Hopkins: His mentor at Cambridge, who instilled in him the "dynamic" view of biochemistry.
Marjory Stephenson: A pioneer in microbial metabolism at Cambridge; they collaborated on early studies of bacterial enzymes.
The "McGill School": In Montreal, he mentored a generation of neurochemists, including K.A.C. Elliott and S.P.R. Rose, establishing Canada as a leader in brain research.

7. Lesser-Known Facts

The Birth of 2,4-D: During his secret wartime research on soil, Quastel discovered that certain chemicals could kill broad-leafed weeds without harming cereal crops. This led to the creation of 2,4-D, the world's most widely used herbicide. While intended to increase food production during the war, the chemical later became a controversial component of Agent Orange during the Vietnam War.
A "Scientific Refugee" Supporter: In the 1930s, Quastel was active in helping Jewish scientists flee Nazi Germany, finding them placements in British laboratories.
The Brain-Slice Technique: Quastel was often criticized early on for using "mushed up" or sliced brain tissue, with detractors claiming it couldn't represent a living mind. He famously retorted:
The chemistry of a cell doesn't cease to be "real" just because the organ is no longer intact
a philosophy that eventually won out.