Cells use a little-known molecule to protect themselves from iron overload
This discovery points toward new combination strategies against cancer, and may explain the iron buildup seen in disorders such as early-onset Parkinson’s disease.
Cells employ an unexpected molecule to guard against an excess of iron, according to recent research from MIT. Iron is vital for energy production, oxygen transportation, and numerous chemical reactions that sustain life. However, an overabundance of this metal can cause cellular damage by breaking down DNA, proteins, and cell membranes.
Researchers from MIT, led by associate professor of biology and Whitehead Institute member Ankur Jain, assistant professor of biology and Koch Institute member Whitney Henry, and former PhD student Pushkal Sharma, have uncovered that cells utilize polyamines to counter this threat. Polyamines, small molecules present in high levels within cells, act like storage lockers for iron, safely containing it until the cell requires it.
This discovery solves a long-standing mystery about the high levels of polyamines observed in cells and introduces a new defense mechanism against toxic iron overload. The findings could aid in developing more effective cancer treatments and provide insights into diseases like early-onset Parkinson’s, where polyamine levels are affected.
By employing a genetic screening method, the researchers identified that reduced polyamine levels lead to the activation of GPX4, a protein that shields cells from iron toxicity. These insights could lead to more effective cancer therapies and uncover new explanations for certain genetic disorders.
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