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Cited by 286

The DOI matches its Crossref record; 51 of the 51 references it cites were found in a registry or an index.

Two Novel IL-1 Family Members, IL-1δ and IL-1ε, Function as an Antagonist and Agonist of NF-κB Activation Through the Orphan IL-1 Receptor-Related Protein 2

Debets, Reno, Timans, Jackie C, Homey, Bernhard, Zurawski, Sandra, Sana, Theodore R, Lo, Sylvia, Wagner, Janet, Edwards, Gina, Clifford, Teresa, Menon, Satish, Bazan, J Fernando, Kastelein, Robert A·2001·The Journal of Immunology

Abstract

IL-1 is of utmost importance in the host response to immunological challenges. We identified and functionally characterized two novel IL-1 ligands termed IL-1δ and IL-1ε. Northern blot analyses show that these IL-1s are highly abundant in embryonic tissue and tissues containing epithelial cells (i.e., skin, lung, and stomach). In extension, quantitative real-time PCR revealed that of human skin-derived cells, only keratinocytes but not fibroblasts, endothelial cells, or melanocytes express IL-1δ and ε. Levels of keratinocyte IL-1δ are ∼10-fold higher than those of IL-1ε. In vitro stimulation of keratinocytes with IL-1β/TNF-α significantly up-regulates the expression of IL-1ε mRNA, and to a lesser extent of IL-1δ mRNA. In NF-κB-luciferase reporter assays, we demonstrated that IL-1δ and ε proteins do not initiate a functional response via classical IL-1R pairs, which confer responsiveness to IL-1α and β or IL-18. However, IL-1ε activates NF-κB through the orphan IL-1R-related protein 2 (IL-1Rrp2), whereas IL-1δ, which shows striking homology to IL-1 receptor antagonist, specifically and potently inhibits this IL-1ε response. In lesional psoriasis skin, characterized by chronic cutaneous inflammation, the mRNA expression of both IL-1 ligands as well as IL-1Rrp2 are increased relative to normal healthy skin. In total, IL-1δ and ε and IL-1Rrp2 may constitute an independent signaling system, analogous to IL-1αβ/receptor agonist and IL-1R1, that is present in epithelial barriers of our body and takes part in local inflammatory responses.

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Crossref · 10.4049/jimmunol.167.3.1440

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Metadata

Authors
Debets, R., Timans, J. C., Homey, B., Zurawski, S., Sana, T. R., Lo, S., Wagner, J., Edwards, G., Clifford, T., Menon, S., Bazan, J. F., & Kastelein, R. A.
Venue
The Journal of Immunology
Published
2001-08-01
Volume
167
Issue
3
Pages
1440-1446
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W2135491202
Cited by
286
References
51
FWCI
4.48
Type
journal article
Language
en
Open access
closed

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