A protein called USP40 appears to protect blood vessels from atherosclerosis by stabilizing another protective protein called SIRT1, according to Gram Research analysis of recent laboratory studies. Mice with increased USP40 showed significantly reduced plaque buildup in their arteries and less inflammation, even without changes in blood cholesterol levels. This discovery identifies a new potential treatment target for heart disease, though human clinical trials are needed before any new medications become available.
Scientists have discovered that a protein called USP40 plays a protective role in preventing atherosclerosis, a disease where fatty deposits build up in arteries and restrict blood flow. According to Gram Research analysis, when USP40 levels are high, it helps protect the inner lining of blood vessels from damage and reduces inflammation. In studies using mice fed a high-fat diet, boosting USP40 significantly reduced plaque buildup in arteries without changing cholesterol levels. This finding suggests USP40 could become a new target for developing heart disease treatments that work differently than current medications.
Key Statistics
A 2026 laboratory study found that increasing USP40 in atherosclerosis-prone mice fed a high-fat diet markedly reduced aortic plaque burden, lipid accumulation, and macrophage infiltration without altering circulating lipid levels.
Research shows that USP40 stabilizes the protective protein SIRT1 by removing degradation signals, and when SIRT1 was depleted in the study, USP40’s anti-apoptotic and anti-inflammatory effects were substantially reversed.
In human blood vessel cells exposed to oxidized cholesterol, USP40 knockdown significantly aggravated cell death and NLRP3 inflammasome activation, demonstrating the protein’s necessity for endothelial protection.
The Quick Take
- What they studied: Whether a protein called USP40 can protect blood vessels and prevent atherosclerosis (hardening of the arteries)
- Who participated: Laboratory studies using mice genetically prone to atherosclerosis, plus human blood vessel cells grown in dishes and treated with oxidized cholesterol
- Key finding: Mice with increased USP40 had significantly less plaque buildup in their arteries and less inflammation, even though their blood cholesterol levels didn’t change
- What it means for you: This research identifies a new potential treatment target for heart disease, though it’s still in early stages. It may eventually lead to new medications that protect blood vessels through a different mechanism than current heart drugs. Talk to your doctor about heart disease prevention strategies that are proven today.
The Research Details
Researchers used multiple approaches to understand USP40’s role in heart disease. First, they examined blood vessel tissue from mice with atherosclerosis and found that USP40 levels were lower than normal. They then grew human blood vessel cells in the lab and exposed them to oxidized cholesterol (a harmful form of cholesterol that damages vessels), which also reduced USP40 levels.
To test whether increasing USP40 could help, scientists used a technique called gene therapy to boost USP40 in mice prone to atherosclerosis that were fed a high-fat diet. They compared these mice to control mice without the USP40 boost. Finally, they reduced USP40 levels in cultured cells to see what happened without this protective protein.
The researchers also investigated the molecular mechanism, essentially how USP40 works at the cellular level, by studying its interaction with another protein called SIRT1.
This multi-layered approach (cell studies, animal models, and molecular investigation) provides strong evidence that USP40 is genuinely involved in protecting blood vessels. Testing in both lab-grown cells and living animals helps confirm that findings aren’t just laboratory artifacts. Understanding the specific mechanism (how USP40 protects SIRT1) is crucial for developing targeted drugs that could mimic this protective effect.
The study used established animal models of atherosclerosis and human cell types relevant to heart disease. The research included both gain-of-function experiments (adding USP40) and loss-of-function experiments (removing it), which strengthens the evidence. However, the abstract doesn’t specify exact sample sizes for animal studies. The findings were published in a peer-reviewed scientific journal, indicating expert review. As with all laboratory research, results need confirmation in human clinical trials before becoming medical treatments.
What the Results Show
When researchers increased USP40 in atherosclerosis-prone mice eating a high-fat diet, the results were striking: plaque buildup in arteries decreased substantially, fat accumulation in vessel walls dropped, and the number of immune cells infiltrating the damaged tissue fell significantly. Importantly, these improvements occurred without any changes in blood cholesterol levels, suggesting USP40 works by protecting the blood vessel lining itself rather than by lowering cholesterol.
In the opposite direction, when USP40 was reduced in human blood vessel cells exposed to oxidized cholesterol, the cells died more readily (increased apoptosis) and inflammatory responses intensified. This confirmed that USP40 is necessary for protecting these cells from damage.
The protective effect of USP40 appears to work through a specific mechanism: USP40 stabilizes another protein called SIRT1 by removing degradation signals (ubiquitin chains) that would normally cause it to be destroyed. When SIRT1 is present and stable, it prevents cell death and reduces inflammation. When researchers removed SIRT1, USP40’s protective effects largely disappeared, proving this is the key mechanism.
The research showed that collagen deposition (scar tissue formation) in arterial walls was reduced when USP40 was increased, suggesting the protein helps maintain normal vessel structure. Macrophage infiltration, the accumulation of immune cells that contribute to plaque formation, was also significantly decreased. These secondary findings indicate USP40 affects multiple aspects of the atherosclerosis process, not just one pathway.
This research identifies a completely new protective mechanism in atherosclerosis prevention. While previous studies have shown that SIRT1 is beneficial for blood vessel health, this is the first work demonstrating that USP40 stabilizes SIRT1 and that this interaction is critical for preventing atherosclerosis. The finding that USP40 works independently of cholesterol levels is particularly novel, as most atherosclerosis research focuses on lipid management. This suggests combination approaches, traditional cholesterol-lowering drugs plus USP40-targeted therapies, might be more effective than either alone.
This research was conducted entirely in laboratory settings and animal models; human clinical trials have not yet been performed. The study doesn’t specify exact sample sizes for the mouse experiments, making it difficult to assess statistical power. Results in mice don’t always translate to humans due to biological differences. The research focused on one specific pathway and doesn’t address whether USP40 might have other effects in the body. Long-term safety and efficacy in humans remain completely unknown. Additionally, the study examined acute atherosclerosis development but didn’t test whether USP40 could reverse existing plaque in advanced disease.
The Bottom Line
Current evidence-based recommendations for preventing atherosclerosis remain: maintain a healthy diet low in saturated fats, exercise regularly, don’t smoke, manage blood pressure and cholesterol with proven medications if needed, and maintain a healthy weight. This USP40 research is promising but preliminary, it’s not yet ready for clinical use. Confidence level: Low for immediate application; High for future research direction. Consult your healthcare provider about proven prevention strategies tailored to your individual risk factors.
This research is most relevant to people at high risk for heart disease, including those with family history, high cholesterol, diabetes, or existing cardiovascular disease. It’s also important for researchers and pharmaceutical companies developing new heart disease treatments. People currently managing heart disease with proven medications should continue their current treatment while this research advances. This is not yet a treatment option for anyone.
If USP40-targeting drugs are developed, they would need to go through years of laboratory testing, animal studies, and human clinical trials before becoming available. Realistic timeline: 5-10+ years before any potential new medication reaches patients, assuming development proceeds successfully.
Frequently Asked Questions
What is USP40 and why is it important for heart health?
USP40 is a protein that protects blood vessel cells from damage and inflammation. Recent research shows it works by stabilizing another protective protein called SIRT1, helping prevent atherosclerosis development. Levels of USP40 are reduced in people with heart disease.
Can I increase my USP40 levels naturally through diet or exercise?
Current research hasn’t identified specific foods or exercises that boost USP40 levels. This research is still in early laboratory stages. For now, proven heart disease prevention methods, regular exercise, healthy diet, not smoking, and managing cholesterol, remain your best options.
When will USP40-based treatments be available for heart disease?
USP40-targeting medications are not yet available. The research is preliminary and would require years of additional testing and human clinical trials before any drug reaches patients. Realistic timeline is 5-10+ years if development proceeds successfully.
Does this research mean I should stop taking my cholesterol medication?
No. This research doesn’t replace proven cholesterol-lowering medications. USP40 works through a different mechanism than cholesterol drugs. Continue taking prescribed medications and consult your doctor before making any changes to your treatment plan.
How does USP40 prevent atherosclerosis differently than current heart disease treatments?
Most heart medications focus on lowering cholesterol levels. USP40 protects blood vessel cells directly by preventing inflammation and cell death, independent of cholesterol levels. This suggests future combination therapies might work better than single-approach treatments.
Want to Apply This Research?
- Track weekly cardiovascular health markers: resting heart rate, blood pressure readings, exercise minutes completed, and dietary saturated fat intake. Monitor these consistently to establish baseline trends and identify improvements from lifestyle changes.
- Set a specific goal to increase aerobic exercise to 150 minutes weekly and reduce saturated fat intake to less than 10% of daily calories. Use the app to log workouts and meals, receiving reminders about proven atherosclerosis prevention strategies while staying informed about emerging research like USP40.
- Establish monthly check-ins reviewing your cardiovascular health metrics. Track how consistent lifestyle changes correlate with improvements in resting heart rate and blood pressure. Share trends with your healthcare provider during annual visits to inform personalized prevention strategies.
This article describes laboratory and animal research that has not yet been tested in humans. USP40-based treatments do not currently exist and are not available for medical use. The findings are preliminary and require extensive additional research and clinical trials before any potential application to human medicine. This information is for educational purposes only and should not be interpreted as medical advice. Do not change your current heart disease prevention or treatment regimen based on this research. Consult your healthcare provider about proven strategies for preventing atherosclerosis and managing cardiovascular disease risk. All medical decisions should be made in consultation with qualified healthcare professionals who understand your individual health status and risk factors.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.
