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Journal Article
Are immunosenescent T cells really senescent?
2024
Overview
Loss of proper T‐cell functioning is a feature of aging that increases the risk of developing chronic diseases. In aged individuals, highly differentiated T cells arise with a reduced expression of CD28 and CD27 and an increased expression of KLRG‐1 or CD57. These cells are often referred to as immunosenescent T cells but may still be highly active and contribute to autoimmunity. Another population of T cells known as exhausted T cells arises after chronic antigen stimulation and loses its effector functions, leading to a failure to combat malignancies and viral infections. A process called cellular senescence also increases during aging, and targeting this process has proven to be fruitful against a range of age‐related pathologies in animal models. Cellular senescence occurs in cells that are irreparably damaged, limiting their proliferation and typically leading to chronic secretion of pro‐inflammatory factors. To develop therapies against pathologies caused by defective T‐cell function, it is important to understand the differences and similarities between immunosenescence and cellular senescence. Here, we review the hallmarks of cellular senescence versus senescent and exhausted T cells and provide considerations for the development of specific therapies against age‐related diseases. This review delineates the molecular hallmarks of cellular senescence and examines whether they are evident in aging‐associated T cells referred to as immunosenescent T cells and exhausted T cells.
Publisher
John Wiley & Sons, Inc,John Wiley and Sons Inc
Subject
/ Animals
/ Antigens
/ Cellular Senescence - immunology
/ Humans
/ Immunosenescence - immunology
/ Kinases
/ Proteins
/ Review
/ T‐cells
/ Yeast
