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Researchers at Memorial Sloan Kettering have cracked a 30-year-old biological mystery, discovering that a molecule known for triggering immune responses also protects healthy cells from inflammatory damage. The key? A gene called DHRS7, identified using zebrafish instead of the usual lab mice. The finding could reshape how we treat cancer, IBD, and asthma.
Scientists at Memorial Sloan Kettering Cancer Center (MSK) have solved a mystery that stumped researchers for over 30 years — and the answer flips conventional wisdom on its head. A fatty signaling molecule called 5-oxoETE, long known for recruiting immune cells to fight infections, turns out to also protect healthy tissue from the very inflammatory damage those immune cells can cause. Think of it as both an alarm and a shield.
The breakthrough hinged on a clever model swap: instead of mice (which lack the receptor needed to study this pathway), the team used zebrafish. That choice allowed them to identify DHRS7 — the long-elusive gene behind the key enzyme in this system — and observe what happens when the pathway breaks down. Disabling it caused more inflammation, not less, even without any infection present.
Key Takeaways:
Why it matters: Inflammation is at the root of countless diseases — from IBD to cancer. This discovery reveals a built-in cellular defense mechanism that scientists didn't know existed, opening a new front for drug development that works with the body's natural protections rather than simply suppressing immune activity.
