Stiff Cells Play a Crucial Role in the Diverse Symptoms of Sickle Cell Disease
MINNEAPOLIS / ST. PAUL (02/10/2026) — A groundbreaking study from the University of Minnesota Twin Cities has shed light on why individuals with the same genetic mutation for sickle cell disease can experience vastly different symptoms, including varying levels of pain, organ damage, and responses to treatment.
Published in the journal Science Advances, this research reveals that the severity of sickle cell disease is not primarily determined by the average thickness of a patient’s blood. Instead, it hinges on the behavior of a specific subset of particularly stiff red blood cells. These rigid cells tend to reorganize themselves within the blood flow, pushing towards the edges of blood vessels in a phenomenon known as margination. This movement generates significantly higher friction and resistance compared to more flexible cells.
Sickle cell disease is a hereditary condition affecting millions around the globe, transforming normally pliable, doughnut-shaped red blood cells into stiff, crescent shapes when oxygen levels are low. This alteration leads to painful blockages and a reduction in life expectancy. Historically, blood tests have relied on bulk measurements that average the characteristics of all cells, often neglecting the critical differences found at the individual cell level.
"Our research connects the dots between the behavior of single cells and the overall dynamics of blood flow," stated David Wood, a professor in the Department of Biomedical Engineering at the University of Minnesota and senior author of the study. "By employing an engineering perspective to examine both individual cell properties and the behavior of whole blood, we discovered that patients—despite having distinct clinical profiles—share a common physical relationship dictated by the proportion of stiff cells."
Utilizing cutting-edge microfluidic chips designed to simulate human blood vessels, the research team identified two significant ways in which blood flow is interrupted:
- Margination: Even a small number of stiff cells can migrate to the walls of blood vessels, significantly increasing friction with those walls.
- Localized Jamming: When present in larger concentrations, these stiff cells can cause blood to 'jam' in specific regions, leading to a sharp increase in resistance to flow.
Interestingly, the study found that these stiff cells can start appearing at oxygen levels as high as 12 percent—levels commonly found in organs like the lungs and brain. This unexpected finding indicates that the processes leading to vessel blockages may begin much earlier during oxygen depletion than previously believed.
"I’m thrilled that we could offer deeper insights into the physical mechanisms that drive this disease," expressed Hannah Szafraniec, the lead author and a Ph.D. candidate in the Department of Biomedical Engineering at the University of Minnesota. "Our findings may pave the way for more targeted, effective therapies and new methods for early symptom detection."
This innovative research holds the potential to lead to personalized treatment options for sickle cell patients, as well as new tools for early warning signs of symptoms. Moreover, the implications of this study could extend to other blood-related disorders, such as malaria, diabetes, and certain types of cancer.
The collaborative research involved contributions from esteemed institutions including University College London, the University of Edinburgh, Harvard University, Massachusetts General Hospital, and Princeton University.
Funding for this research was provided by the National Heart, Lung, and Blood Institute, a part of the U.S. National Institutes of Health.
To delve deeper into this study, you can access the full paper titled "Suspension physics govern the multiscale dynamics of blood flow in sickle cell disease" on the Science Advances website. (https://www.science.org/doi/10.1126/sciadv.adx3842#abstract)
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