Surface expression of the IFN-ΓR2 chain is regulated by intracellular trafficking in human T lymphocytes

Laura Rigamonti, Silvia Ariotti, Giuliana Losana, Roberto Gradini, Matteo A. Russo, Emmanuelle Jouanguy, Jean Laurent Casanova, Guido Forni, Francesco Novelli

Research output: Contribution to journalArticlepeer-review

Abstract

The surface and cytoplasmic expressions of the transducing chain (IFN- γR2) of the heterodimeric IFN-γ receptor on human T lymphocytes have been investigated. We show that its surface expression is low, whereas high cytoplasmic levels are found in both resting and PHA-activated T lymphocytes. This low expression does not prevent activated T cells from responding to IFN-γ, because it induces IFN-regulatory factor 1 expression. Low surface IFN-γR2 expression appears to be due to recycling between cytoplasmic stores and the cell surface, which does not depend on signals mediated by endogenous IFN-γ, because IFN-γR2 surface expression is low, and its internalization is equally observed in patients with inherited IFN-γR1 gene deficiency and in healthy donors. Moreover, IFN-γR2 internalization in T lymphoblasts from healthy donors was not affected by the presence of anti-IFN-γ-neutralizing or anti-IFN-γR1-blocking mAb. In conclusion, these data illustrate a new mechanism whereby human T cells limit the surface expression of IFN-γR2 in a ligand-independent manner.

Original languageEnglish
Pages (from-to)201-207
Number of pages7
JournalJournal of Immunology
Volume164
Issue number1
Publication statusPublished - Jan 1 2000

ASJC Scopus subject areas

  • Immunology

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