Age-Associated failure to adjust type i IFN receptor signaling thresholds after T cell activation

Guangjin Li, Jihang Ju, Cornelia M. Weyand, Jörg J. Goronzy

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

With increasing age, naive CD4 T cells acquire intrinsic defects that compromise their ability to respond and differentiate. Type I IFNs, pervasive constituents of the environment in which adaptive immune responses occur, are known to regulate T cell differentiation and survival. Activated naive CD4 T cells from older individuals have reduced responses to type I IFN, a defect that develops during activation and that is not observed in quiescent naive CD4 T cells. Naive CD4 T cells from young adults upregulate the expression of STAT1 and STAT5 after activation, lowering their threshold to respond to type I IFN stimulation. The heightened STAT signaling is critical to maintain the expression of CD69 that regulates lymphocyte egress and the ability to produce IL-2 and to survive. Although activation of T cells from older adults also induces transcription of STAT1 and STAT5, failure to exclude SHP-1 from the signaling complex blunts their type I IFN response. In summary, our data show that type I IFN signaling thresholds in naive CD4 T cells after activation are dynamically regulated to respond to environmental cues for clonal expansion and memory cell differentiation. Naive CD4 T cells from older adults have a defect in this threshold calibration. Restoring their ability to respond to type I IFN emerges as a promising target to restore T cell responses and to improve the induction of T cell memory.

Original languageEnglish (US)
Pages (from-to)865-874
Number of pages10
JournalJournal of Immunology
Volume195
Issue number3
DOIs
StatePublished - Aug 1 2015

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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