Cited by 264T-cell and B-cell ImmunologyRheumatoid Arthritis Research and TherapiesCytokine Signaling Pathways and Interactions

Down-Regulation of CD28 Expression by TNF-α

Open access
Bryl, Ewa, Vallejo, Abbe N, Weyand, Cornelia M, Goronzy, Jörg J·2001·The Journal of Immunology

Abstract

Aging and chronic inflammatory syndromes, such as rheumatoid arthritis, are associated with high frequencies of CD4+CD28null T cells, which are rarely seen in healthy individuals younger than 40 years. Inasmuch as rheumatoid arthritis and aging are also associated with elevated levels of TNF-α, we examined whether this proinflammatory cytokine influences CD28 expression. Incubation of T cell lines and clones as well as Jurkat cells with TNF-α induced a reduction in the levels of cell surface expression of CD28. This effect of TNF-α was reversible; however, continuous culture of CD4+CD28+ T cell clones in TNF-α resulted in the appearance of a CD28null subset. In reporter gene bioassays, TNF-α was found to inhibit the activity of the CD28 minimal promoter. Inactivation of the promoter was accompanied by a marked reduction in DNA-protein complex formation by two DNA sequence motifs corresponding to the transcriptional initiator of the CD28 gene. Indeed, in vitro transcription assays showed that nuclear extracts from TNF-α-treated cells failed to activate transcription of DNA templates under the control of a consensus TATA box and the CD28 initiator sequences. In contrast, similar extracts from unstimulated T cells supported transcription. These results demonstrate that TNF-α directly influences CD28 gene transcription. We propose that the emergence of CD4+CD28null T cells in vivo is facilitated by increased production of TNF-α.

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 · 10.4049/jimmunol.167.6.3231

Cites

60 of 60 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

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

Cited by

Sorted by citations

Authors
Bryl, E., Vallejo, A. N., Weyand, C. M., & Goronzy, J. J.
Affiliations
  • Mayo Clinic (US)
  • Departments of Medicine and Immunology, Mayo Clinic , Rochester, MN 55905
Venue
The Journal of Immunology
Published
2001-09
Volume
167
Issue
6
Pages
3231-3238
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W1764386432
Cited by
264
References
60
Citations by year
2026: 5 · 2024: 9 · 2023: 5 · 2022: 9 · 2021: 9 · 2020: 14 · 2019: 13 · 2018: 8 · 2017: 11 · 2016: 9 · 2015: 16 · 2014: 11 · 2013: 12 · 2012: 12
FWCI
3.68
Type
journal article
Language
en
Open access
Locations
  • The Journal of Immunology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Mayo Foundation for Medical Education and Research (R01 AR41974)
  • National Institutes of Health
  • National Institute on Aging (R01AG015043, R01AG15043)
  • Fogarty International Center
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (R01AR041974, R01 AR 41974, R03-AR45830, R03AR045830)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Health Sciences › Medicine › Rheumatology › Rheumatoid Arthritis Research and Therapies
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
Keywords
CD28, TNF-α, CD4+ T cells, rheumatoid arthritis, aging, transcriptional regulation, TATA box, protein-DNA complex, chronic inflammation, T cell activation
MeSH terms
Aging, Arthritis, Rheumatoid, Camptothecin, Cell Line, Cell-Free System, Clone Cells, Humans, Lymphocyte Activation, Neoplasm Proteins, Promoter Regions, Genetic, RNA, Messenger, RNA, Neoplasm, T-Lymphocytes, Transcription, Genetic, Tumor Necrosis Factor-alpha, CD4-Positive T-Lymphocytes, Down-Regulation, TATA Box, Apoptosis, Annexin A5, Genes, Reporter, CD28 Antigens, Jurkat Cells

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