Malt1 self-cleavage is critical for regulatory T cell homeostasis and anti-tumor immunity in mice.

Abstract:

:Mucosa-associated lymphoid tissue 1 (Malt1) regulates immune cell function by mediating the activation of nuclear factor κB (NF-κB) signaling through both its adaptor and proteolytic function. Malt1 is also a target of its own protease activity and this self-cleavage further contributes to NF-κB activity. Until now, the functional distinction between Malt1 self-cleavage and its general protease function in regulating NF-κB signaling and immune activation remained unclear. Here we demonstrate, using a new mouse model, the importance of Malt1 self-cleavage in regulating expression of NF-κB target genes and subsequent T cell activation. Significantly, we further establish that Treg homeostasis is critically linked to Malt1 function via a Treg intrinsic and extrinsic mechanism. TCR-mediated Malt1 proteolytic activity and self-cleavage was found to drive Il2 expression in conventional CD4+ T cells, thereby regulating Il2 availability for Treg homeostasis. Remarkably, the loss of Malt1-mediated self-cleavage alone was sufficient to cause a significant Treg deficit resulting in increased anti-tumor immune reactivity without associated autoimmunity complications. These results establish for the first time that inhibition of MALT1 proteolytic activity could be a viable therapeutic strategy to augment anti-tumor immunity.

journal_name

Eur J Immunol

authors

Baens M,Stirparo R,Lampi Y,Verbeke D,Vandepoel R,Cools J,Marynen P,de Bock CE,Bornschein S

doi

10.1002/eji.201847597

subject

Has Abstract

pub_date

2018-10-01 00:00:00

pages

1728-1738

issue

10

eissn

0014-2980

issn

1521-4141

journal_volume

48

pub_type

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