Go to JCI Insight
  • About
  • Editors
  • Consulting Editors
  • For authors
  • Publication ethics
  • Publication alerts by email
  • Advertising
  • Job board
  • Contact
  • Clinical Research and Public Health
  • Current issue
  • Past issues
  • By specialty
    • COVID-19
    • Cardiology
    • Gastroenterology
    • Immunology
    • Metabolism
    • Nephrology
    • Neuroscience
    • Oncology
    • Pulmonology
    • Vascular biology
    • All ...
  • Videos
    • Conversations with Giants in Medicine
    • Video Abstracts
  • Reviews
    • View all reviews ...
    • Complement Biology and Therapeutics (May 2025)
    • Evolving insights into MASLD and MASH pathogenesis and treatment (Apr 2025)
    • Microbiome in Health and Disease (Feb 2025)
    • Substance Use Disorders (Oct 2024)
    • Clonal Hematopoiesis (Oct 2024)
    • Sex Differences in Medicine (Sep 2024)
    • Vascular Malformations (Apr 2024)
    • View all review series ...
  • Viewpoint
  • Collections
    • In-Press Preview
    • Clinical Research and Public Health
    • Research Letters
    • Letters to the Editor
    • Editorials
    • Commentaries
    • Editor's notes
    • Reviews
    • Viewpoints
    • 100th anniversary
    • Top read articles

  • Current issue
  • Past issues
  • Specialties
  • Reviews
  • Review series
  • Conversations with Giants in Medicine
  • Video Abstracts
  • In-Press Preview
  • Clinical Research and Public Health
  • Research Letters
  • Letters to the Editor
  • Editorials
  • Commentaries
  • Editor's notes
  • Reviews
  • Viewpoints
  • 100th anniversary
  • Top read articles
  • About
  • Editors
  • Consulting Editors
  • For authors
  • Publication ethics
  • Publication alerts by email
  • Advertising
  • Job board
  • Contact
Tregs restrain dendritic cell autophagy to ameliorate autoimmunity
Themis Alissafi, … , Ken Cadwell, Panayotis Verginis
Themis Alissafi, … , Ken Cadwell, Panayotis Verginis
Published June 5, 2017
Citation Information: J Clin Invest. 2017;127(7):2789-2804. https://doi.org/10.1172/JCI92079.
View: Text | PDF
Research Article Autoimmunity Immunology

Tregs restrain dendritic cell autophagy to ameliorate autoimmunity

  • Text
  • PDF
Abstract

Design of efficacious Treg-based therapies and establishment of clinical tolerance in autoimmune diseases have proven to be challenging. The clinical implementation of Treg immunotherapy has been hampered by various impediments related to the stability and isolation procedures of Tregs as well as the specific in vivo targets of Treg modalities. Herein, we have demonstrated that Foxp3+ Tregs potently suppress autoimmune responses in vivo through inhibition of the autophagic machinery in DCs in a cytotoxic T-lymphocyte–associated protein 4–dependent (CTLA4-dependent) manner. Autophagy-deficient DCs exhibited reduced immunogenic potential and failed to prime autoantigen-specific CD4+ T cells to mediate autoimmunity. Mechanistically, CTLA4 binding promoted activation of the PI3K/Akt/mTOR axis and FoxO1 nuclear exclusion in DCs, leading to decreased transcription of the autophagy component microtubule-associated protein 1 light chain 3β (Lc3b). Human DCs treated with CTLA4-Ig, a fusion protein composed of the Fc region of IgG1 and the extracellular domain of CTLA4 (also known as abatacept, marketed as Orencia), demonstrated reduced levels of autophagosome formation, while DCs from CTLA4-Ig–treated rheumatoid arthritis patients displayed diminished LC3B transcripts. Collectively, our data identify the canonical autophagy pathway in DCs as a molecular target of Foxp3+ Treg–mediated suppression that leads to amelioration of autoimmune responses. These findings may pave the way for the development of therapeutic protocols that exploit Tregs for the treatment of autoimmunity as well as diseases in which disturbed tolerance is a common denominator.

Authors

Themis Alissafi, Aggelos Banos, Louis Boon, Tim Sparwasser, Alessandra Ghigo, Kajsa Wing, Dimitrios Vassilopoulos, Dimitrios Boumpas, Triantafyllos Chavakis, Ken Cadwell, Panayotis Verginis

×

Figure 1

Foxp3+ Treg–mediated tolerance regulates autophagy in DCs.

Options: View larger image (or click on image) Download as PowerPoint
Foxp3+ Treg–mediated tolerance regulates autophagy in DCs.
(A) Hierarchi...
(A) Hierarchical clustering of autophagy-related genes upon transcriptomic analysis of sorted DCs from control (n = 2) and tolerized (n = 3) mice. (B) Relative mRNA expression of Atg5 and Atg16l1 in DCs from control, tolerized, and tolerized Foxp3+ Treg–depleted mice. Results are expressed as mean ± SEM. n = 6 mice per group, 3 independent experiments. *P = 0.0389; †P = 0.0147; ‡P = 0.0145; §P = 0.0241. (C) Western blot analysis for expression of LC3, p62, and actin in DC lysates of indicated groups. Protein extract from Neuro 2A cell line was used as control. One representative experiment of 4 is depicted. Relative intensity of LC3II/LC3I and p62 are depicted. Results are expressed as mean ± SEM. n = 6 mice per group, 3 independent experiments. *P = 0.0184; †P = 0.05; ‡P = 0.0432. (D) Immunofluorescence confocal microscopy for LC3 (red), LAMP-1 (green), p62 (silver white), and DAPI (blue) in DCs. Representative fields at 2 different magnifications are depicted. Scale bars: 5 μm. One representative experiment of 3 is shown. n = 4 mice per group. LC3 puncta/cell and p62 puncta/cell are depicted. ***P < 0.0001; **P = 0.0003. Results are expressed as mean ± SEM. n = 4 mice per group, 3 independent experiments. For A–D, DCs were isolated from dLNs and spleens of mice at 3.5 days after immunization. Statistical significance was obtained by 2-way ANOVA.

Copyright © 2025 American Society for Clinical Investigation
ISSN: 0021-9738 (print), 1558-8238 (online)

Sign up for email alerts