New Study Shows Stress Impacts Heart at Molecular Level

By Liam Connolly, edited by Gaby Clark

Published on August 28, 2025

New research from cardiovascular scientists at UC Davis Health reveals that stress affects more than just the mind—it also alters heart function at the molecular level.

Published in the Journal of Molecular and Cellular Cardiology, the study explores how environmental and social stressors, such as noise, overcrowding, and sleep disruption, can impact cardiovascular health. The research focuses on understanding the effects of chronic psychosocial stress on the development and progression of cardiovascular disease.

Key Findings of the Study

The research team utilized animal models to discover significant shifts in cardiac function due to stress. Notably, just 10 days of acute stress was found to:

• Trigger increased inflammation.
• Induce subtle changes in heart function.
• Activate multiprotein complexes known as NLRP3 inflammasomes, which exacerbate inflammation.

Padmini Sirish, adjunct associate professor of cardiovascular research and co-author of the study, stated, “We discovered that stress activates these multiprotein complexes through mechanisms involving cell stress and endoplasmic reticulum stress.” This finding sheds light on how stress may directly facilitate processes in heart cells that release harmful molecules, contributing to heart disease.

Impact on Human Health

Researchers believe that making lifestyle changes to lower stress can be beneficial; however, they acknowledge that such changes are not always viable, especially for individuals living in high-stress environments plagued by pollution, noise, or social challenges. Sirish emphasized that “using this new information, our goal is to find targets in the body that could help us create new treatments. If we can't remove the stress, we can at least reduce how much it harms the heart.”

Future Research Directions

The team is currently investigating chronic stress and its effects on the communication between the brain and heart, along with how stress potentially disrupts gut bacteria and body chemistry. The long-term objective is to collaborate with clinicians in transforming these findings into effective treatments for patients.

Multidisciplinary Collaboration

This study is part of the American Heart Association's Strategic Focused Research Network (SFRN), which includes collaboration between UC Davis, Ohio State University, and Wake Forest University. The investigative group consists of experts from four different schools and colleges:

Sirish stated, “By bringing together experts from such diverse fields, we're able to look at heart health from many angles. This integrated study extends our ongoing work in underserved communities and will enhance our understanding of their higher cardiovascular risks and related outcomes.”

Conclusion

The implications of this study are profound. With evidence suggesting that psychosocial stress significantly impacts heart function through molecular changes, the research heralds a new direction in understanding and treating cardiovascular diseases. Future studies could pave the way for novel therapeutic strategies aimed at mitigating the effects of chronic stress.

Reference

Diloretto, D. et al. (2025). Psychosocial stress amplifies inflammation through NLRP3 inflammasome activated by endoplasmic reticulum stress in the mouse heart. Journal of Molecular and Cellular Cardiology. DOI: 10.1016/j.yjmcc.2025.07.008.

For more information, visit Medical Xpress.