IL-6 family members contribute to host defense through the stimulation of acute-phase signaling, hematopoiesis, immune reactions, and regenerative processes. To investigate essential mechanisms that are linked toward a constitutively activated gp130 signaling, we generated and characterized a mouse model that reflects a constitutive and cytokine-independent activation of JAK/STAT3 signaling by Lgp130 in CD4- and CD8-positive T cells. Lgp130 is an engineered form of gp130 in which dimerization and activation are forced by a leucine zipper. T cell–specific Lgp130 activation resulted in massive phenotypical abnormalities, including splenomegaly, lymphadenopathy, and an upregulation of innate immune system components shown by hyperinflammatory signatures in several organs. Moreover, T cell–restricted expression of Lgp130 resulted in increased numbers of cytotoxic and regulatory T cells, especially in lymph nodes. Consistent with this, we found an elevated platelet production and increase in megakaryocytes in the spleen and bone marrow that are causative for an acute thrombocytosis accompanied by anemia. Due to a shortened life span of T cell–specific Lgp130 mice, we could also show that next to an overall increase in regulatory cell-cycle genes, an activation of p53 and increased expression of p21 provide evidence for a senescence-like phenotype. Together, these data suggest that T cell–restricted gp130 activation is not only involved in autoimmune processes but also in senescence-associated aging. Therefore, Lgp130 expression in T cells might be a suitable model to study inflammation and disease.

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