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Protease Activated Receptor 4 as a Novel Modulator of Regulatory T Cell Function

Research output: Contribution to journalArticlepeer-review

Original languageEnglish
Article number1311
Pages (from-to)1-14
Number of pages14
JournalFrontiers in Immunology
Issue numberJUN
Early online date18 Jun 2019
Accepted/In press23 May 2019
E-pub ahead of print18 Jun 2019
PublishedJun 2019


  • fimmu-10-01311

    fimmu_10_01311.pdf, 2.57 MB, application/pdf

    Uploaded date:06 Aug 2019

    Version:Final published version

    Licence:CC BY

King's Authors


Regulatory T cells (Tregs) are a subpopulation of T cells that maintain immunological tolerance. In inflammatory responses the function of Tregs is tightly controlled by several factors including signaling through innate receptors such as Toll like receptors and anaphylatoxin receptors allowing an effective immune response to be generated. Protease-activated receptors (PARs) are another family of innate receptors expressed on multiple cell types and involved in the pathogenesis of autoimmune disorders. Whether proteases are able to directly modulate Treg function is unknown. Here, we show using two complimentary approaches that signaling through PAR-4 influences the expression of CD25, CD62L, and CD73, the suppressive capacity, and the stability of Tregs, via phosphorylation of FoxO1 and negative regulation of PTEN and FoxP3. Taken together, our results demonstrate an important role of PAR4 in tuning the function of Tregs and open the possibility of targeting PAR4 to modulate immune responses.

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