Scientists at McGill University have discovered that T cells can detect how stiff their surrounding tissues are and use that physical information to influence whether they develop into long-lasting memory cells, a finding published in Nature Immunology that challenges long-held assumptions about how the body builds lasting protection against infections.
For years, researchers believed that tissue-resident memory T cells, specialized immune cells that remain in tissues after an infection and respond quickly if the same threat returns, were guided mainly by chemical signals. The new study challenges that assumption, showing that T cells can sense the mechanical properties of their environment and adapt to them.
"This is an exciting fundamental finding that challenges the way we think about immune cells," said lead author Judith Mandl, a 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."
To test whether physical surroundings influence T cell behavior, the researchers studied immune cells collected from humans and mice, placing them in specially designed collagen gels that mimicked tissues with different levels of stiffness. The experiments revealed a clear pattern: as the gels became stiffer, T cells were increasingly likely to acquire characteristics associated with tissue-resident memory cells, which help provide long-term immune protection.
The discovery could eventually open new possibilities for treating autoimmune disorders, allergies and complications involving transplant rejection, conditions in which the immune system mistakenly targets healthy tissue. It may also inform cancer research.
"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.
The researchers now hope to identify the specific molecular sensor that enables T cells to detect their physical environment. Understanding how this sensor converts mechanical forces into changes in cell behavior could help explain how the immune system establishes lasting protection.
The study brought together scientists from McGill's Department of Physiology, the Alan Edwards Centre for Research on Pain, the Department of Bioengineering and the McGill University Health Centre, along with collaborating institutions in the Netherlands and the United States.
Analysis
Why This Matters
- The finding adds a physical dimension to immunology, suggesting tissue stiffness is an active force in shaping immune behavior, not just a backdrop.
- It could help explain why some protective immune cells persist in tissues and how long-term immunity forms after infection or vaccination.
- Understanding how T cells adapt to dense environments may guide cancer immunotherapy design aimed at helping immune cells penetrate and attack tumors.
Background
Tissue-resident memory T cells are specialized cells that remain in the body's tissues after an infection and respond quickly if the same threat returns. For years, researchers believed these cells were guided mainly by chemical signals. The new study challenges that view by showing that the physical stiffness of surrounding tissues can influence whether T cells develop into these long-lasting memory cells. The experiments used collagen gels to mimic tissues of different stiffness, revealing that stiffer conditions push cells toward a tissue-resident memory fate.
What to Watch
- Whether researchers identify the specific molecular sensor that converts mechanical forces into changes in T cell behavior.
- Whether the findings translate into immunotherapies better able to penetrate dense tumor environments.
- Follow-up studies testing whether the effect seen in collagen gels holds in living tissues.
Checked
12 claims in this story checked against 1 source: 11 supported.
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- SupportedT cells sense tissue stiffness to build long-term immunity, the study finds.Latest Science News -- ScienceDaily: “Researchers found that T cells can detect how stiff their surrounding tissues are and use this physical information to influence whether they develop into long-lasting memory cells.”
- Partly supportedMcGill-led research challenges the view that immune memory is driven only by chemical signals.Latest Science News -- ScienceDaily: “For years, researchers believed that tissue-resident memory T cells, specialized immune cells that remain in the body's tissues after an infection and respond quickly if the same threat returns, were guided mainly by chemical signals.”
- SupportedMcGill scientists discovered that T cells sense tissue stiffness and use that information to influence whether they develop into long-lasting memory cells.Latest Science News -- ScienceDaily: “Researchers found that T cells can detect how stiff their surrounding tissues are and use this physical information to influence whether they develop into long-lasting memory cells.”
- SupportedThe study was published in Nature Immunology.Latest Science News -- ScienceDaily: “However, a new study published in Nature Immunology challenges that assumption.”
- SupportedResearchers had believed tissue-resident memory T cells were guided mainly by chemical signals.Latest Science News -- ScienceDaily: “For years, researchers believed that tissue-resident memory T cells, specialized immune cells that remain in the body's tissues after an infection and respond quickly if the same threat returns, were guided mainly by chemical signals.”
- SupportedJudith Mandl said, “This is an exciting fundamental finding that challenges the way we think about immune cells,” and that T cells can “feel” their surroundings and adapt to them, making the physical environment an active force in shaping their behavior.Latest Science News -- ScienceDaily: “"This is an exciting fundamental finding that challenges the way we think about immune cells," said lead author Judith Mandl, a 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."”
- SupportedResearchers studied immune cells collected from humans and mice in specially designed collagen gels mimicking tissues with different stiffness levels.Latest Science News -- ScienceDaily: “To investigate whether physical surroundings influence T cell behavior, the researchers studied immune cells collected from humans and mice. They placed the cells inside specially designed collagen gels that mimicked tissues with different levels of stiffness.”
- SupportedAs the gels became stiffer, T cells were increasingly likely to acquire characteristics associated with tissue-resident memory cells.Latest Science News -- ScienceDaily: “As the gels became stiffer, T cells were increasingly likely to acquire characteristics associated with tissue-resident memory cells, which help provide long-term immune protection.”
- SupportedThe discovery could eventually open possibilities for treating autoimmune disorders, allergies and complications involving transplant rejection.Latest Science News -- ScienceDaily: “These include autoimmune disorders, allergies, and complications involving transplant rejection.”
- SupportedMandl said, “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.”Latest Science News -- ScienceDaily: “"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.”
- SupportedThe researchers hope to identify the specific molecular sensor that lets T cells detect their physical environment.Latest Science News -- ScienceDaily: “The researchers now hope to identify the specific molecular sensor that enables T cells to detect their physical environment.”
- SupportedThe study brought together McGill departments and the McGill University Health Centre, as well as collaborating institutions in the Netherlands and the United States.Latest Science News -- ScienceDaily: “The research brought together scientists from McGill's Department of Physiology, the Alan Edwards Centre for Research on Pain, the Department of Bioengineering, and the McGill University Health Centre, along with collaborating institutions in the Netherlands and the United States.”
