Researchers created special stem cells by removing a protein called METTL1 to see if they could treat fatty liver disease, a condition where fat builds up in the liver. When they tested these modified cells in mice fed a high-fat diet, the cells released a helpful substance that reduced fat in the liver and improved how the body processes fat. The cells worked by triggering a chain reaction that turned off genes responsible for making fat. While these results are promising, this research is still in early stages and hasn’t been tested in people yet.
The Quick Take
- What they studied: Whether specially designed stem cells without a protein called METTL1 could reduce fat buildup in the liver and improve liver health in mice with fatty liver disease.
- Who participated: Laboratory mice that were fed a high-fat diet to develop fatty liver disease, plus stem cells grown from human umbilical cord tissue that were genetically modified in the lab.
- Key finding: Modified stem cells without METTL1 released higher amounts of a protective substance called NAMPT, which activated a chain reaction that significantly reduced fat accumulation in the liver and improved fat metabolism in the mice.
- What it means for you: This research suggests a potential new treatment approach for fatty liver disease, but it’s still experimental. The findings are promising but need further testing in humans before anyone should consider this as a treatment option.
The Research Details
Scientists created stem cells from human umbilical cord tissue and used genetic engineering to remove the METTL1 protein from some of these cells. They then tested how these modified cells behaved in laboratory dishes, looking at whether they could still divide, grow old, or die normally. Next, they transplanted these cells into mice that had been fed a high-fat diet to develop fatty liver disease, similar to how some people develop the condition. The researchers measured changes in the mice’s blood work, liver function, and liver tissue under a microscope to see if the modified cells helped. They also used advanced lab techniques to trace exactly how the cells were working at the molecular level.
This approach is important because it combines two powerful medical strategies: using stem cells (which can help repair damaged tissue) and genetic modification (which can make cells work better). By understanding exactly how these modified cells help the liver, scientists can develop more targeted treatments for fatty liver disease, which affects millions of people worldwide and currently has limited treatment options.
This is laboratory and animal research, which means it’s an early-stage study. The researchers used multiple testing methods to confirm their findings, which strengthens the results. However, because it was only tested in mice and not in humans, we can’t be certain the same effects would occur in people. The study appears well-designed with proper controls, but the sample size of mice tested wasn’t specified in the available information.
What the Results Show
The modified stem cells without METTL1 successfully reduced fat accumulation in liver cells grown in dishes and in the livers of mice with fatty liver disease. The cells released significantly higher amounts of a protective substance called NAMPT, which triggered a chain reaction involving a protein called SIRT1. This chain reaction then turned off genes that normally tell the body to make more fat. When researchers blocked NAMPT, the protective effects disappeared, proving that NAMPT was the key to how these cells worked. In contrast, when they added extra METTL1 to normal stem cells, the cells became worse at protecting against fatty liver disease.
The modified stem cells showed some unexpected characteristics: they divided less frequently than normal stem cells, aged faster, and were more likely to die. Despite these weaknesses, they were still effective at treating fatty liver disease. This suggests that the cells don’t need to be strong and long-lasting to provide therapeutic benefits—their ability to release NAMPT is what matters most.
Previous research showed that stem cells could help with various diseases, and other studies identified METTL1 as important for cell function. This research builds on those findings by showing that removing METTL1 actually makes stem cells better at treating one specific disease (fatty liver disease), even though it makes the cells weaker overall. This is a surprising finding that goes against what scientists might have expected.
This study was only conducted in mice, not humans, so we don’t know if the results would be the same in people. The exact number of mice tested wasn’t clearly stated. The research was done in controlled laboratory conditions, which are very different from the complex environment inside a living body. Long-term effects weren’t studied—researchers only looked at what happened over a relatively short period. Additionally, the modified stem cells showed reduced ability to survive and multiply, which could be a problem for practical medical use.
The Bottom Line
Based on this research, there is currently no recommendation for people to use this treatment, as it hasn’t been tested in humans. However, this work suggests that scientists should continue researching genetically modified stem cells as a potential future treatment for fatty liver disease. If you have fatty liver disease, current evidence-based approaches include losing weight, reducing sugar and alcohol intake, and exercising regularly—talk to your doctor about these options.
People with fatty liver disease or at risk for developing it should be aware of this emerging research. Healthcare providers and researchers studying liver disease should pay attention to these findings. People considering stem cell treatments should be cautious and only pursue treatments that have been tested in humans and approved by medical authorities. This research is not yet ready for clinical use.
This is very early-stage research. If the findings hold up in further studies, it would typically take 5-10 years or more before such a treatment could be tested in humans, and several more years before it might become available as a medical treatment. Don’t expect this to be available soon.
Want to Apply This Research?
- Track liver health markers if you have fatty liver disease: monitor weight weekly, record alcohol consumption daily, and note energy levels and any digestive symptoms. If participating in any clinical trials in the future, use the app to log any symptoms or changes you notice.
- Use the app to set and track goals for fatty liver disease prevention or management: reduce added sugar intake, increase physical activity to 150 minutes per week, and maintain a healthy weight. Set reminders for regular doctor visits to monitor liver function tests.
- For long-term tracking, monitor weight trends monthly, log dietary choices focusing on reducing processed foods and saturated fats, and track exercise consistency. If this treatment ever becomes available in clinical trials, use the app to document any changes in symptoms, energy levels, or lab results over time.
This research is preliminary and has only been tested in mice. It has not been evaluated in humans and is not approved for medical use. If you have fatty liver disease or are concerned about your liver health, consult with a qualified healthcare provider about proven treatment options. Do not seek out or attempt to use stem cell treatments based on this research alone. Always discuss any new or experimental treatments with your doctor before considering them. This information is for educational purposes only and should not be considered medical advice.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.