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Gene expression profile at single cell level of CD45+ immune cells from E0771-Vector control tumor tissue, E0771 wildtype Malt1 overexpression tumor tissue and E0771 paracaspase-deficient Malt1 overexpression tumor tissue.

ABSTRACT: To invesitigate the additional paracaspase-independent tumor-promoting effect exist for Malt1. We thus collected E0771-Vector control tumor tissue, E0771 wildtype Malt1 (Malt1-WT) overexpression tumor tissue and E0771 paracaspase-deficient Malt1 (Malt1-PD) overexpression tumor tissue, and sorted out immune cells for 10× Genomics single cell RNA-sequencing (scRNA-seq).

ORGANISM(S): Mus musculus

PROVIDER: GSE242554 | GEO | 2024/04/18

REPOSITORIES: GEO

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Gene expression profile at single cell level of CD45+ immune cells from E0771-Vector control tumor tissue, E0771 wildtype Malt1 overexpression tumor tissue and E0771 paracaspase-deficient Malt1 overexpression tumor tissue.

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Uncoupling Malt1 threshold function from paracaspase activity results in destructive autoimmune inflammation

Project description:The paracaspase Malt1 is a central regulator of antigen receptor signaling that is frequently mutated in human lymphoma. As a scaffold, it assembles protein complexes for NF-kB activation, and its proteolytic domain cleaves negative NF-kB regulators for signal enforcement. Still, the physiological functions of Malt1-protease are unknown. We demonstrate that targeted Malt1-paracaspase inactivation induces a lethal inflammatory syndrome with lymphocyte-dependent neurodegeneration in vivo. Paracaspase activity is essential for regulatory T-cell and innate-like B-cell development, but it is largely dispensable for overcoming Malt1-dependent thresholds for lymphocyte activation. In addition to NF-kB inhibitors, Malt1 cleaves an entire set of mRNA stability regulators, including Roquin-1, Roquin-2 and Regnase-1, and paracaspase inactivation results in excessive IFNÎ³ production by effector lymphocytes that drives pathology. Together, our results reveal distinct threshold and modulatory functions of Malt1 that differentially control lymphocyte differentiation and activation pathways and demonstrate that selective paracaspase blockage skews systemic immunity towards destructive autoinflammation. Total RNA obtained from T cells with (1h and 4 h) and without stimulation, 3 biological replicates, 3 genotypes (Malt+/-, Malt-/-, MaltPM/-)

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