T Cells Have a Hidden Ability Scientists Never Knew Existed

The discovery could lead to improved treatments for autoimmune diseases and cancer.

T cells may be able to do something scientists did not previously know they could: physically sense the tissues around them. A McGill University-led study suggests this ability could reshape understanding of how long-lasting immune protection develops.

Researchers have generally thought that tissue resident memory T cells, which remain in tissues after an infection has passed and react quickly if the same threat returns, are guided mainly by biochemical signals.

Tissue stiffness helps shape immune memory

Research published in Nature Immunology challenges that assumption. The findings indicate that T cells can detect how stiff their surrounding tissue is and use that physical information to help determine whether they develop into long-lived memory cells. The researchers suggest that adapting to the stronger mechanical forces present in tissues may be important for these cells to persist over time.

“This is an exciting fundamental finding that challenges the way we think about immune cells,” said lead author Judith Mandl, Professor in McGill’s Department of Physiology. “It suggests T cells can ‘feel’ their surroundings and adapt to them, making the physical environment an active force in shaping their behavior.”

The work brought together researchers from McGill’s Department of Physiology, the Alan Edwards Centre for Research on Pain, the Department of Bioengineering, the McGill University Health Centre, and collaborating institutions in the Netherlands and the United States.

Physical cues could influence future treatments

The finding could eventually contribute to new strategies for autoimmune diseases, allergies, and transplant rejection, conditions in which T cells can mistakenly target healthy tissue.

The researchers also say the discovery may be relevant to cancer.

“Tumors are often dense and physically difficult for immune cells to penetrate. Understanding how T cells adapt to these environments could help researchers design cancer immunotherapies that are better able to reach and attack tumors,” said Mandl.

Stiffer environments favored memory-like cells

To investigate how physical surroundings affect T cells, the researchers placed immune cells from humans and mice into engineered collagen gels designed to mimic tissues with different levels of stiffness. Cells in the stiffer gels were more likely to develop characteristics resembling tissue-resident memory cells, which are linked to long-term immune protection.

The next question is how T cells detect these physical conditions. Researchers now want to identify the molecular sensor that allows the cells to perceive stiffness and convert mechanical force into a biological response.

Reference: “Mechanosensing by T cells promotes a tissue-resident memory transcriptional program” by Jérémy Postat, Mauricio Merino, Angela R. Mingarelli, Aysha Cerf, Aanya Bhagrath, Dhanesh Patel, Connie Shen, Johanna Brodbeck, Pouria Tirgar, Dakota Rogers, Jules Blanc, Thiviya Jeyakumar, Caitlin Schneider, Shana Coley, Nadia Giannetti, Taylor A. DePauw, Johannes Textor, Allen Ehrlicher, Stephen C. Jameson, Reza Sharif-Naeini, Abhinav Sharma and Judith N. Mandl, 3 July 2026, Nature Immunology.
DOI: 10.1038/s41590-026-02581-9

The study was supported by the Human Frontier Science Program, the Canadian Institutes of Health Research, the Canadian Foundation for Innovation, the Natural Sciences and Engineering Research Council of Canada and the U.S. National Institutes of Health.

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