Researchers Link Mechanical Stiffness to Tendon Cell Recovery

Specific tendon cells can regain their structural integrity and reproductive capabilities when transferred from stiff to soft mechanical environments, according to a study by researchers at Queen Mary University of London. This finding provides a potential mechanism for understanding why pain associated with tendinopathy often persists despite treatment attempts.

Cellular Response to Mechanical Stiffness

The investigation focused on the interfascicular matrix (IFM), a softer tissue layer situated between collagen bundles known as fascicles within tendons. These structures transmit forces enabling movement such as walking and lifting. The team isolated IFM cells alongside those from the fascicular matrix (FM) to compare their behavior under controlled laboratory conditions.

When grown on surfaces of varying stiffness, FM cells showed minimal changes. In contrast, IFM cells significantly altered their internal structure and gene activity related to tendon function and extracellular matrix production. On stiffer surfaces, these IFM cells also demonstrated a reduced capacity to multiply.

Reversibility of Cellular Changes

Dr. Simon Grossemy, the lead researcher, noted that different tendon cell populations react distinctly to mechanical shifts. He emphasized the importance of this distinction given that tendons undergo structural and stiffness changes during disease progression. Professor Hazel Screen, the principal investigator, highlighted that returning IFM cells to softer surfaces resembling their natural habitat reversed several negative effects.

This recovery included restored cell shape, renewed ability to multiply, and partial reversal of altered gene activity. Screen stated that the physical environment is a critical factor in maintaining the behavior and characteristics of these cells. The results suggest that modifying surroundings could potentially reverse certain detrimental changes in tendon cell behavior.

Implications for Research and Treatment

The study, published in Advanced Science on 13 September 2026, does not claim that IFM cells cause tendinopathy or offer a direct cure. Instead, it establishes an experimental system for investigating these questions further. A defined culture method helps preserve key IFM cell characteristics, addressing the issue that removing cells from natural tissue often alters their behavior.

These findings may advance research into tendon injury and recovery across species, including horses, whose tendons endure substantial forces during athletic activity. By comparing cellular responses, scientists aim to better understand how tissue environments influence the maintenance of healthy tendons or the development of disease.