Overall, it is important to study the relationship between tumor cell and matrix stiffness and immune cell metabolism and immune microenvironment remodeling. A study by Rizzi's group last year quantified the effect of tumor stromal stiffness on regulatory T lymphocytes in three dimensions. First, when T cells are in a three-dimensional state, the pressure on the cell membrane is distributed throughout the cell, the cell suddenly becomes smaller, and the cell volume is significantly reduced. Second, the nuclei of T cells subjected to 360-degree circumferential pressure became smaller, which may be a deformation of T cells in response to circumferential pressure. The third aspect is that high-density ECM is also selective for changes in T cells. It has been found that high-density ECM favors the activity of CD4+ T cells rather than CD8+ T cells. This is achieved by altering the gene expression of different T cells. CD4+ T cells promote the development of inflammation, while CD8+ T cells kill tumors.
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