Cited by 781Cancer Immunotherapy and BiomarkersT-cell and B-cell ImmunologyPhagocytosis and Immune Regulation

PD-1 signaling in primary T cells

Open access
Riley, James L.·2009·Immunological Reviews

Abstract

Summary: Programmed death‐1 (PD‐1) is a cell surface molecule that regulates the adaptive immune response. Engagement of PD‐1 by its ligands PD‐L1 or PD‐L2 transduces a signal that inhibits T‐cell proliferation, cytokine production, and cytolytic function. While a great deal is known concerning the biologic roles PD‐1 plays in regulating the primary immune response and in T‐cell exhaustion, comparatively little is known regarding how PD‐1 ligation alters signaling pathways. PD‐1 ligation is known to inhibit membrane‐proximal T‐cell signaling events, while ligation of the related inhibitory molecule cytotoxic T‐lymphocyte antigen‐4 appears to target more downstream signaling pathways. A major obstacle to an in‐depth understanding of PD‐1 signaling is the lack of physiologic models in which to study signal transduction. This review focuses on: (i) signaling pathways altered by PD‐1 ligation, (ii) factors recruited upon PD‐1 phosphorylation, and (iii) exploring the hypothesis that PD‐1 ligation induces distinct signals during various stages of immune‐cell differentiation. Lastly, we describe models to dissect the function of the PD‐1 cytoplasmic tail using primary cells in the absence of agonist antibodies.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1111/j.1600-065x.2009.00767.x

Cites

95 of 95 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Recruitment of SHP-1 and/or SHP-2 to the ITSM in the PD-1 cytoplasmic tail inhibits signaling, particularly PI3K/AKT activation downstream of the T-cell receptor, causing T cell dysfunction.

    “it is suggested that recruitment of SH2-domain containing protein tyrosine phosphatases (SHP-1 and/or SHP-2) to the immunoreceptor tyrosine-based switch motif (ITSM) within the PD-1 cytoplasmic tail inhibits signaling events, particularly PI3K/AKT activation, downstream signals of the T-cell receptor [34], and in turn results in T cell dysfunction.”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Research works printed but not linked: 5

  1. [8]Okazaki T Honjo T The PD-1-PD-L pathway in immunological tolerance Trends Immunol 2006 27 195 201 16500147
  2. [26]Riley JL June CH The CD28 family: a T-cell rheostat for therapeutic control of T-cell activation Blood 2005 105 13 21 15353480
  3. [27]Okazaki T Honjo T The PD-1-PD-L pathway in immunological tolerance Trends Immunol 2006 27 195 201 16500147
  4. [52]Okazaki T Maeda A Nishimura H Kurosaki T Honjo T PD-1 immunoreceptor inhibits B cell receptor-mediated signaling by recruiting src homology 2-domain-containing tyrosine phosphatase 2 to phosphotyrosine Proc Natl Acad Sci U S A 2001 98 13866 13871 11698646 PMC61133
  5. [98]Sharpe AH Freeman GJ The B7-CD28 superfamily Nat Rev Immunol 2002 2 116 126 11910893

Cited by

Sorted by citations

Authors
Riley, J. L.
Affiliations
University of Pennsylvania (US)
Corresponding author
Riley, James L.
Venue
Immunological Reviews
Publisher
Wiley
Published
2009-04-21
Volume
229
Issue
1
Pages
114-125
ISSN
  • 0105-2896 (ISSN-L)
  • 1600-065X
OpenAlex
W2017712207
Cited by
778
References
95
Citations by year
2026: 21 · 2025: 39 · 2024: 37 · 2023: 66 · 2022: 73 · 2021: 84 · 2020: 64 · 2019: 61 · 2018: 60 · 2017: 49 · 2016: 33 · 2015: 41 · 2014: 34 · 2013: 37 · 2012: 30
FWCI
2.32
Type
journal article
Language
en
Open access
Locations
  • Immunological Reviews (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Cancer Institute (CA113783, R01CA113783)
  • National Institute of Allergy and Infectious Diseases (AI080192, P01AI080192, R01AI057838, AI057838, PD-1 PO1AI080192)
Topics
  • Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
Keywords
PD-1 signaling, PDCD1, PD-L1, PD-L2, T cell exhaustion, T cell proliferation inhibition, cytotoxic T lymphocyte antigen 4, signal transduction, T cell differentiation, immune checkpoint, primary T cells
MeSH terms
Animals, Antigens, Surface, Humans, T-Lymphocytes, Signal Transduction, Antigens, CD, CD28 Antigens, Apoptosis Regulatory Proteins, Mice, Protein Tyrosine Phosphatase, Non-Receptor Type 6, Protein Tyrosine Phosphatase, Non-Receptor Type 11, CTLA-4 Antigen, Programmed Cell Death 1 Receptor

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review