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PKC-ѳ is dispensable for OX40L-induced TCR-independent Treg proliferation but contributes by enabling IL-2 production from effector T-cells.

Abstract：

:We have previously shown that OX40L/OX40 interaction is critical for TCR-independent selective proliferation of Foxp3+ Tregs, but not Foxp3- effector T-cells (Teff), when CD4+ T-cells are co-cultured with GM-CSF derived bone marrow dendritic cells (G-BMDCs). Events downstream of OX40L/OX40 interaction in Tregs responsible for this novel mechanism are not understood. Earlier, OX40L/OX40 interaction has been shown to stimulate CD4+ T-cells through the formation of a signalosome involving TRAF2/PKC-Ѳ leading to NF-kB activation. In this study, using CD4+ T-cells from WT and OX40-/- mice we first established that OX40 mediated activation of NF-kB was critical for this Treg proliferation. Although CD4+ T-cells from PKC-Ѳ-/- mice were also defective in G-BMDC induced Treg proliferation ex vivo, this defect could be readily corrected by adding exogenous IL-2 to the co-cultures. Furthermore, by treating WT, OX40-/-, and PKC-Ѳ-/- mice with soluble OX40L we established that OX40L/OX40 interaction was required and sufficient to induce Treg proliferation in vivo independent of PKC-Ѳ status. Although PKC-Ѳ is dispensable for TCR-independent Treg proliferation per se, it is essential for optimum IL-2 production by Teff cells. Finally, our findings suggest that OX40L binding to OX40 likely results in recruitment of TRAF1 for downstream signalling.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Alharshawi K,Marinelarena A,Kumar P,El-Sayed O,Bhattacharya P,Sun Z,Epstein AL,Maker AV,Prabhakar BS

doi

10.1038/s41598-017-05254-8

subject

Has Abstract

pub_date

2017-07-26 00:00:00

pages

6594

issue

1

issn

2045-2322

pii

10.1038/s41598-017-05254-8

journal_volume

7

pub_type

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