Mammalian Cells Discovered Producing Elemental Sulfur
The molecule cyclooctasulfur functions as an internal reservoir to power the cell's antioxidant defenses.
Updated on Sept. 25, 2026 in Chemistry
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Researchers have identified that mammalian cells generate and store elemental sulfur in the form of cyclooctasulfur. This molecule acts as a precursor that the body later converts into hydropersulfides to provide antioxidant protection.
Why it matters
Understanding this storage mechanism reveals a foundational process in cellular metabolism. It suggests that elemental sulfur plays a previously unrecognized role in protecting cells from oxidative stress.
The study confirmed that the enzyme eNOS is responsible for synthesizing cyclooctasulfur. These molecules reach high concentrations within mitochondria and lipid droplets, acting as a stable elemental sulfur reserve.
The players
Tohoku University
A Japanese research institution focused on advanced materials science and biomedical innovation.
Max Planck Institute
A prominent German scientific research organization dedicated to fundamental discovery in biology and chemistry.
The details
The process relies on the enzyme eNOS — a protein that catalyzes the production of signaling molecules — to synthesize cyclooctasulfur, a ring-shaped molecule composed of eight sulfur atoms. Cells sequester these molecules within mitochondria — the energy-generating organelles of the cell — and lipid droplets, which are fat-storage organelles. Through internal chemical reactions, the body converts these sulfur rings into hydropersulfides, which are reactive compounds that function as potent antioxidants.
Timeline
September 25, 2026: Research findings were published in the journal Science.
The Tech Race
This research provides a new metabolic target for scientists studying redox signaling pathways. It shifts the field's focus toward how elemental sulfur, rather than just protein-bound sulfur, supports cellular longevity.
These findings are currently limited to fundamental research and do not yet offer direct clinical applications or treatments for the public. Future developments will focus on whether modulating these sulfur pathways can mitigate age-related or oxidative diseases.
The takeaway
The discovery of cyclooctasulfur storage in cells opens a new window into how life maintains oxidative balance. Scientists will now look for ways to influence these levels in clinical models to test the impact on cellular health.
Further reading
For more on the latest research in molecular structures, explore our Chemistry section.
More information
Read the Original scientific publication in Science for full technical details.
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