Researchers identified an RNA-processing enzyme that helps fat cells keep enough insulin receptors working normally. Removing the enzyme caused severe insulin resistance, fatty liver, and loss of healthy fat tissue in mice—but this is mechanism research, not a new treatment for diabetes or obesity.
What changed
The enzyme, called Star-PAP, helps stabilize the messenger RNA used to make insulin receptors. Researchers first found a rare Star-PAP variant in lean people but not in obesity cases, then tested the biology in cells and genetically engineered mice. Mice lacking Star-PAP specifically in fat tissue progressively lost fat, accumulated fat in the liver, and developed severe insulin resistance—features resembling human lipodystrophy. Restoring insulin receptors in fat cells partially improved the abnormalities. Pyruvate also repaired several downstream cellular changes in the experimental system. The peer-reviewed paper was accepted September 18 and published October 29, 2026.
How strong is the evidence?
This is detailed laboratory and animal evidence supported by a rare human genetic observation. Gene deletion, RNA-binding experiments, and partial rescue tests strengthen the proposed mechanism. The authors declared no competing interests.
What remains uncertain
The human variant was rare and does not show that Star-PAP explains common obesity or type 2 diabetes. Mouse lipodystrophy is not the same as ordinary insulin resistance. Pyruvate was an experimental rescue, not a tested supplement or therapy for people.
Why it matters
The study adds RNA stability to the chain connecting fat-cell health, insulin signaling, and fatty liver. It may guide future drug research, but it gives readers no reason to change medication, diet, or supplement use today.
Related: Continuous glucose monitoring in adults with type 2 diabetes not using insulin.
Sources
Original open-access study in Nature Communications.
Illustrative stock photograph by Ousa Chea on Unsplash; it does not depict the study, experimental cells, animals, genetic variant, or results.
