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| Home > Publications database > Skeletal muscle antagonizes antiviral CD8+ T cell exhaustion. |
| Home > Publications database > Skeletal muscle antagonizes antiviral CD8+ T cell exhaustion. |
| Journal Article | DKFZ-2020-01113 |
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2020
Assoc.
Washington, DC [u.a.]
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Please use a persistent id in citations: doi:10.1126/sciadv.aba3458
Abstract: CD8+ T cells become functionally impaired or 'exhausted' in chronic infections, accompanied by unwanted body weight reduction and muscle mass loss. Whether muscle regulates T cell exhaustion remains incompletely understood. We report that mouse skeletal muscle increased interleukin (IL)-15 production during LCMV clone 13 chronic infection. Muscle-specific ablation of Il15 enhanced the CD8+ T cell exhaustion phenotype. Muscle-derived IL-15 was required to maintain a population of CD8+CD103+ muscle-infiltrating lymphocytes (MILs). MILs resided in a less inflamed microenvironment, expressed more T cell factor 1 (Tcf1), and had higher proliferative potential than splenic T cells. MILs differentiated into functional effector T cells after reentering lymphoid tissues. Increasing muscle mass via muscle-specific inhibition of TGFβ signaling enhanced IL-15 production and antiviral CD8+ T cell responses. We conclude that skeletal muscle antagonizes T cell exhaustion by protecting T cell proliferative potential from inflammation and replenishing the effector T cell progeny pool in lymphoid organs.
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