A recent study by researchers from Vanderbilt University and collaborating institutions has identified active remodeling of the endoplasmic reticulum (ER) as a newly recognized feature of cellular aging. The research, published in Nature Cell Biology, suggests that cells actively reshape the ER through a process called ER-phagy, potentially impacting lifespan and offering new targets for age-related chronic diseases.
Cells actively reshape the Endoplasmic Reticulum (ER) through ER-phagy, a newly recognized feature of cellular aging that could impact lifespan and offer new targets for age-related chronic diseases.
Research Context
Advances in public health and medicine have contributed to extended human lifespans. However, aging is also associated with an increased incidence of chronic illnesses such as cancer, diabetes, and Alzheimer's disease.
The Kris Burkewitz lab, specializing in cell and developmental biology, focuses on understanding the connection between aging and disease, with the ultimate goal of promoting healthier aging. Their research investigates how cells organize internal structures, known as organelles, and how changes in these structures affect cellular performance, metabolism, and disease risk.
Endoplasmic Reticulum Remodeling Identified in Aging
The study describes a cellular response to aging involving the active remodeling of the endoplasmic reticulum (ER), a large and complex internal cellular structure. This remodeling is characterized as a controlled process that occurs as organisms age.
Kris Burkewitz, an Assistant Professor of Cell and Developmental Biology at Vanderbilt University, stated:
"While previous studies have documented changes in the levels of cellular machinery with age, his team focused on how aging affects the organization of these machineries within the cell's internal architecture."
The ER, an extensive transport system, plays a central role in protein and lipid production and provides structural support for the cell, forming a network of sheets and tubules. Prior to this study, understanding of how the ER's structure changes with age was limited.
Role of ER-phagy in Remodeling
The research identified ER-phagy, a recently recognized process, as the mechanism through which cells selectively break down specific regions of the ER. ER-phagy is a form of autophagy, where damaged or unnecessary cellular components, specifically ER subdomains, are broken down and recycled by digestive enzymes.
The study indicates that ER-phagy actively contributes to reshaping the ER during aging and was linked to lifespan, suggesting a role in healthier aging rather than merely reflecting cellular decline. Researchers suggest this ER remodeling may represent a proactive and protective response during the aging process.
Methodology and Observations
Eric Donahue, the study's first author, noted the significance of this discovery in aging research. The team utilized genetic tools alongside advanced light, electron, and fluorescence microscopy to observe ER changes over time.
They studied living Caenorhabditis elegans worms, a transparent model organism with a short lifespan, which allowed for direct observation of cellular changes in intact animals as they age.
The researchers observed that aging cells significantly reduce the amount of "rough" ER, which is associated with protein production. In contrast, the tubular form of the ER, linked to lipid production, experienced only a slight decline. This pattern aligns with known aspects of aging, such as a reduced ability to maintain healthy proteins and metabolic shifts contributing to fat accumulation. However, further research is needed to confirm direct cause-and-effect relationships.
Future Directions and Potential Implications
The identification of ER-phagy as a component of the aging process suggests it could become a target for future drug therapies aimed at age-related chronic conditions, including neurodegenerative disorders and metabolic diseases.
The Burkewitz lab plans to continue investigating how different ER structures influence metabolism at both cellular and whole-organism levels. Understanding how ER remodeling affects the broader cellular landscape is a next step.
Burkewitz suggested that changes in the ER occur relatively early in the aging process and may trigger subsequent dysfunction and disease, indicating that identifying the exact initiators of these early ER changes could potentially enable prevention strategies for age-related diseases.
Publication and Funding
The paper, "ER remodelling is a feature of ageing and depends on ER-phagy," was published in Nature Cell Biology in February 2026.
This research involved collaborations with multiple labs at Vanderbilt University, the University of Michigan, and the University of California, San Diego. Funding for this work was provided by the National Institute on Aging, the National Institute of General Medical Sciences, and the Glenn Foundation for Medical Research/American Federation for Aging Research.