Scientists reveal why a popular anti-aging compound may also fuel cancer
Science Daily
March 2, 2026
AI-Generated Deep Dive Summary
Scientists have uncovered a puzzling paradox surrounding polyamines, natural molecules known for their role in promoting healthy aging but also linked to aggressive cancer growth. Polyamines, such as spermidine, are celebrated for their ability to stimulate autophagy—a cellular process that cleans up damaged components and supports longevity. However, these same compounds are frequently found in high levels within cancer cells, where they contribute to rapid tumor progression.
A team of researchers led by Associate Professor Kyohei Higashi from Tokyo University of Science investigated how polyamines influence cellular metabolism differently in healthy versus cancerous tissues. Their study revealed that polyamines primarily enhance glycolysis—a process that provides quick energy for rapidly growing cancer cells—rather than boosting mitochondrial respiration, which is more associated with the anti-aging benefits seen in normal cells.
The researchers identified a key mechanism involving two nearly identical proteins: eIF5A1 and eIF5A2. In healthy tissues, polyamines activate eIF5A1, which promotes mitochondrial activity and autophagy. Conversely, in cancer tissues, polyamines increase the production of eIF5A2, which controls gene expression at the translational level to fuel cancer cell proliferation. This shift is further driven by polyamines disrupting miR-6514-5p, a regulatory RNA molecule that normally limits eIF5A2 levels.
The findings highlight how polyamines trigger distinct pathways depending on the context—supporting cellular maintenance in healthy cells while enabling rapid growth in cancer cells. This discovery offers valuable insights into cancer metabolism and could pave the way for developing targeted therapies to inhibit polyamine-driven tumor progression without compromising their potential benefits for anti-aging.
Understanding this dual role of polyamines is crucial for researchers aiming to balance their therapeutic applications
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Originally published on Science Daily on 3/2/2026