Research shows that interleukin-38 (IL-38), a natural immune protein, significantly reduced heart damage in obese mice by activating a cellular cleanup process called autophagy. According to Gram Research analysis, IL-38 treatment restored the heart’s ability to remove damaged components and reduced stress inside heart cells, with these protective effects disappearing when autophagy was blocked. While these findings are promising, this is early-stage animal research, and human studies are needed before IL-38 could become a treatment for obesity-related heart disease.
According to Gram Research analysis, scientists discovered that a natural protein called interleukin-38 (IL-38) may protect hearts damaged by obesity. In a study using mice fed high-fat diets, IL-38 treatment reduced heart damage by activating a cellular cleanup process called autophagy. The protein worked by reducing stress inside heart cells and lowering inflammation. These findings suggest IL-38 could become a new treatment to prevent heart problems in people with obesity, though human studies are still needed to confirm these results.
Key Statistics
A 2026 research article found that IL-38 treatment significantly ameliorated myocardial injury in mice fed a high-fat diet for 20 weeks, with the protective effects dependent on activation of the AMPK/autophagy signaling pathway.
According to the study, IL-38 restored autophagy that was suppressed by high-fat diet feeding and markedly attenuated elevated endoplasmic reticulum stress in obese mice, with concurrent improvements in systemic metabolic parameters.
Research showed that blocking either autophagy or AMPK abolished the cardioprotective and stress-reducing effects of IL-38, proving these pathways are essential for the protein’s benefits.
The study demonstrated that IL-38 treatment reduced cardiac inflammatory cytokines in obesity-induced cardiomyopathy, suggesting anti-inflammatory benefits alongside direct heart protection.
The Quick Take
- What they studied: Whether a natural immune protein called IL-38 could protect mouse hearts from damage caused by eating a high-fat diet
- Who participated: Laboratory mice fed a high-fat diet for 20 weeks, with some receiving IL-38 treatment for the final 8 weeks. Researchers also tested the protein on isolated heart cells in dishes
- Key finding: IL-38 treatment significantly reduced heart damage, restored the heart’s cellular cleanup system, and lowered stress inside heart cells in obese mice
- What it means for you: This research is early-stage and only tested in mice, so it’s too soon to say if IL-38 will work in humans. However, it opens a promising new direction for treating obesity-related heart disease. People with obesity should continue following proven heart-healthy strategies while researchers explore this potential treatment
The Research Details
Researchers used mice to study how a protein called IL-38 affects hearts damaged by obesity. They fed mice a high-fat diet for 20 weeks to damage their hearts, then gave some mice IL-38 treatment for the last 8 weeks. They measured heart function, looked at heart tissue under a microscope, and tested blood markers of metabolism and inflammation.
To understand how IL-38 worked, they also blocked the cellular cleanup system (autophagy) in some mice to see if it was necessary for protection. They tested IL-38 on isolated heart cells in laboratory dishes to confirm their findings. This combination of whole-animal and cellular experiments helps prove that IL-38 works through a specific biological pathway.
This research approach is important because it shows not just that IL-38 helps, but exactly how it works. By blocking autophagy and seeing that protection disappears, researchers proved this cleanup process is essential. Testing in both living mice and isolated cells strengthens confidence in the findings. Understanding the mechanism helps scientists design better treatments and predict whether IL-38 might work in humans
This study was published in a peer-reviewed scientific journal, meaning other experts reviewed it before publication. The researchers used multiple methods to measure effects and tested their theory by blocking the protective pathway. However, this is animal research, which doesn’t always translate to humans. The study doesn’t specify exact sample sizes, and human trials would be needed to confirm safety and effectiveness
What the Results Show
IL-38 treatment significantly improved heart function in mice with obesity-induced heart damage. The protein restored the heart’s natural cellular cleanup system (autophagy), which was suppressed by the high-fat diet. IL-38 also reduced stress inside heart cells, which is a major cause of heart damage in obesity.
When researchers blocked the cleanup system, IL-38 lost its protective effects, proving this pathway is essential. The protein also reduced inflammation markers in the blood and decreased inflammatory chemicals in the heart tissue. These improvements happened alongside better metabolic markers, suggesting IL-38 helps the whole body, not just the heart.
Beyond heart protection, IL-38 improved overall metabolic health markers in obese mice, including better blood sugar control and reduced fat-related inflammation. The protein reduced cardiomyocyte hypertrophy (excessive growth of heart muscle cells) and decreased apoptosis (programmed cell death), both major problems in obesity-related heart disease. These systemic improvements suggest IL-38 has broader metabolic benefits beyond direct heart protection
Previous research showed that autophagy activation helps protect hearts and that IL-38 has anti-inflammatory properties. This study connects these findings by showing IL-38 specifically activates autophagy through the AMPK pathway. The results align with earlier work showing that reducing endoplasmic reticulum stress (cellular stress) protects against obesity-related heart disease, but this is the first study showing IL-38 does this through autophagy activation
This research only tested IL-38 in mice, not humans, so results may not translate directly. The study doesn’t report exact sample sizes for all experiments. Researchers used a specific type of high-fat diet and obesity model, which may not represent all types of human obesity. The study is relatively short-term (8 weeks of treatment), so long-term safety and effectiveness remain unknown. Finally, IL-38 would need to be developed as a drug, which requires extensive additional testing
The Bottom Line
This research is too early to recommend IL-38 as a treatment. People with obesity should continue proven strategies: maintain a healthy weight through balanced eating and exercise, manage blood pressure and cholesterol, and work with doctors on heart health. Researchers should pursue human studies to test whether IL-38 is safe and effective in people (confidence level: preliminary animal evidence)
People with obesity or obesity-related heart disease should follow this research, as it may lead to new treatments. Cardiologists and obesity specialists should monitor IL-38 development. People without obesity don’t need to change their approach based on this single animal study. Anyone with existing heart disease should continue their current medical treatment
If IL-38 proves safe in human studies, it would likely take 5-10 years to develop as a treatment. Early human safety trials would come first, followed by effectiveness studies. Even if successful, IL-38 would complement, not replace, proven heart-healthy habits like exercise and healthy eating
Frequently Asked Questions
Can interleukin-38 treat heart disease caused by obesity?
IL-38 shows promise in mice, significantly reducing heart damage through cellular cleanup activation. However, this is early research—human studies are needed to determine if it’s safe and effective in people. Current proven treatments like weight loss, exercise, and medications remain the standard approach
How does IL-38 protect the heart from obesity damage?
IL-38 activates a cellular cleanup system called autophagy through the AMPK pathway, which removes damaged components from heart cells and reduces internal stress. This prevents the heart muscle from thickening and dying, which normally happens with obesity
Is IL-38 available as a treatment right now?
No, IL-38 is not yet available as a treatment. This research was conducted in mice and laboratory cells. Extensive human safety and effectiveness studies would be required before it could become a medication, likely taking several years
What should people with obesity do about heart health while waiting for new treatments?
Continue proven strategies: maintain a healthy weight through balanced nutrition and regular exercise, manage blood pressure and cholesterol, reduce stress, and work with your doctor on preventive care. These approaches remain the most effective ways to protect your heart
Why do obese people get heart damage, and how does IL-38 help?
Obesity causes stress inside heart cells, triggering inflammation and preventing normal cellular cleanup. IL-38 restores this cleanup process and reduces cellular stress, protecting heart muscle from damage and dysfunction
Want to Apply This Research?
- Track weekly heart health markers: resting heart rate, blood pressure readings, and perceived energy levels. Log these alongside diet quality and exercise minutes to monitor overall cardiovascular wellness
- Set a daily reminder to log one heart-healthy behavior: 30 minutes of moderate exercise, a serving of vegetables, or a stress-reduction activity. Use the app to track progress toward obesity management goals while this research develops
- Create a monthly heart health dashboard showing trends in resting heart rate, blood pressure, and weight. Set alerts if metrics worsen, prompting conversations with your doctor about preventive strategies
This research is preliminary animal-based science and has not been tested in humans. IL-38 is not currently available as a treatment. People with obesity or heart disease should not change their medical care based on this study. Continue following your doctor’s recommendations for heart health, including medications, exercise, and dietary changes. Consult your healthcare provider before making any changes to your treatment plan. This article 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.