WASHINGTON, Feb. 4, 2010 — In a finding that overturns conventional wisdom, scientists are reporting the first discovery of the female sex hormone progesterone in a plant. Until now, scientists thought that only animals could make progesterone. A steroid hormone secreted by the ovaries, progesterone prepares the uterus for pregnancy and maintains pregnancy. A synthetic version, progestin, is used in birth control pills and other medications. The discovery is reported in the American Chemical Society’s Journal of Natural Products, a monthly publication.
“The significance of the unequivocal identification of progesterone cannot be overstated,” the article by Guido F. Pauli and colleagues, states. “While the biological role of progesterone has been extensively studied in mammals, the reason for its presence in plants is less apparent.” They speculate that the hormone, like other steroid hormones, might be an ancient bioregulator that evolved billions of years ago, before the appearance of modern plants and animals. The new discovery may change scientific understanding of the evolution and function of progesterone in living things.
Leaves of the walnut tree
contain progesterone,
the female sex hormone,
discovered for the first
time in a plant.
Credit: iStock
Scientists previously identified progesterone-like substances in plants and speculated that the hormone itself could exist in plants. But researchers had not found the actual hormone in plants until now. Pauli and colleagues used two powerful laboratory techniques, nuclear magnetic resonance and mass spectroscopy, to detect progesterone in leaves of the Common Walnut, or English Walnut, tree. They also identified five new progesterone-related steroids in a plant belonging to the buttercup family.
CONTACT:
Guido F. Pauli, Ph.D.
College of Pharmacy
University of Illinois
Chicago, Ill. 60612
Phone: 312-355-1949
Fax: 312-355-2693
Email: gfp@uic.edu
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The American Chemical Society is a nonprofit organization chartered by the U.S. Congress. With more than 161,000 members, ACS is the world’s largest scientific society and a global leader in providing access to chemistry-related research through its multiple databases, peer-reviewed journals and scientific conferences. Its main offices are in Washington, D.C., and Columbus, Ohio.
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