Too much copper in the liver might be making diabetes worse.

Type 2 diabetes causes liver problems, including fat buildup and poor responses to insulin, the hormone that controls blood sugar. Researchers wanted to see if a liver protein named SLC31A1, which imports copper into cells, plays a role in these metabolic issues. They studied diabetic mice and stressed liver cells in dishes. They found that diabetic livers had higher SLC31A1 levels, which trapped too much copper inside cells and shut down a helpful metabolic regulator called AMPKα1AMPKα1An enzyme inside cells that acts like a master energy switch, turning on processes that burn energy and turning off those that store it, such as making sugar or fat.. When the researchers silenced SLC31A1, copper stopped piling up and AMPKα1 turned back on. This single fix helped the mice handle insulin and glucose much better. It lowered excess glucose production, helped the liver store sugar properly again, and cut down dangerous fat accumulation, swelling, oxidative stress, and overall liver damage. Stressed cells also showed less fat buildup and better sugar balance.

Why it matters

This matters because it suggests a new way that diet and metabolism are connected: excess copper buildup in the liver, driven by a specific copper-transporting protein called SLC31A1, can interfere with a key energy-regulating signal (AMPKα1), leading to higher blood sugar and fat accumulation. If confirmed, this opens the possibility of targeting copper metabolism as a treatment for insulin resistance and fatty liver disease, conditions that affect millions of people with obesity or type 2 diabetes.

Questions answered