Nature Aging proposes studying immune aging in tissue models
Nature Aging proposes studying immune aging in tissue models
On July 29, Nature Aging published a Perspective on the bioengineering of immune aging. Janko Nikolich and colleagues propose studying immune cells together with the tissue in which they live and the way a drug or vaccine reaches that tissue.
Both immune cells and the tissue environment in which they function change with age. A cell receives signals from neighboring cells, blood vessels, and the extracellular matrix, the material between cells that supports tissue and affects its physical and chemical properties.
A conventional atlas of age-related changes shows which cells or genes differ between young and older people. However, this comparison does not distinguish cause from effect. To do that, a researcher must change one part of the system and measure how the other parts respond. The authors propose building models specifically for such experiments.
A biomaterial can reproduce properties of the extracellular matrix. A microphysiological system, which is a small device containing cells and fluid flows, determines how the cells are arranged and how they exchange signals. An organoid creates a three-dimensional fragment of tissue. In such a system, researchers can independently change environmental properties and cellular composition, then measure the immune response. If the response changes only with cellular composition while the environment remains unchanged, an explanation based on the tissue does not withstand testing.
The authors also include targeted delivery in the experiment, using methods that direct a drug or vaccine to the intended tissue. The delivery site becomes an experimental variable, alongside cellular composition and matrix properties. The study of immune aging can then be divided into a testable sequence: how the tissue environment changes cellular signals, and how an intervention acts within a specific immune niche.
In this research program, age-related vulnerability to infection, cancer, inflammation, and impaired healing is treated as a set of mechanisms operating in specific tissues, rather than as a single property of the immune system.