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Trained immunity is facilitated by T cell-induced CD40-TRAF6 signaling [ChIP-seq]

ABSTRACT: Trained immunity refers to epigenetic and metabolic changes in innate immune cells following exposure to inflammatory signals, leading to a heightened response to secondary stimuli. Although this innate immune memory contributes to host defense against infections, it can also have maladaptive consequences in a broad range of immune-driven conditions. During the past decade, we have gained an increasingly better understanding of the molecular regulation of trained immunity, but the role of adaptive immune cells in modulation of trained immunity remains largely unknown. Here, we show that T cell interactions contribute to the induction of trained immunity in monocytes and that this mediated by CD40-TRAF6 signaling. Specifically, we found that inhibiting CD40-TRAF6 signaling prevents the induction of functional, transcriptomic, metabolic and epigenetic changes associated with trained immunity. Apart from detailed in vitro studies, we inhibited CD40-TRAF6 signaling in vivo in myeloid cells in a murine heart transplantation model which resulted in prolonged allograft survival. When the animals were additionally treated with costimulatory blockade by CTLA4-Ig, we observed immunological tolerance to the graft. Combined, our study reveals that trained immunity induction is regulated by CD40-TRAF6 signaling between myeloid and adaptive immune cells, and that this signaling can be efficiently leveraged for therapeutic purposes.

ORGANISM(S): Homo sapiens

PROVIDER: GSE228182 | GEO | 2024/08/26

REPOSITORIES: GEO

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Project description:TRAF-interacting protein with forkhead-associated domain B (TIFAB) is a haploinsufficient gene in del(5q) Myelodysplastic syndrome (MDS). Hematopoietic-specific deletion of Tifab results in progressive bone marrow (BM) and blood defects, including skewed hematopoietic stem/progenitor cells (HSPC) proportions, altered myeloid differentiation, and progressive cytopenia. A subset of mice transplanted with Tifab knockout (KO) hematopoietic cells develop a bone marrow failure (BMF)-like disease with neutrophil dysplasia and cytopenia. In competitive transplants, Tifab KO HSPC are out-competed by wild-type (WT) cells, suggesting a cell-intrinsic HSPC defect. Gene expression analysis of Tifab KO HSPC identified dysregulation of immune-related signatures, and hypersensitivity to Toll-like receptor 4 (TLR4) stimulation. TIFAB also forms a complex with TRAF6, a mediator of immune signaling, and reduces TRAF6 protein stability by a lysosome-dependent mechanism. In contrast, TIFAB loss increases TRAF6 protein and the dynamic range of TLR4 signaling in HSPC, contributing to ineffective hematopoiesis. Moreover, combined deletion of TIFAB and miR-146a, two genes associated with del(5q) MDS/AML, results in a cooperative increase in TRAF6 expression and hematopoietic dysfunction in vivo. Re-expression of TIFAB in human del(5q) leukemic cells results in attenuated TLR4 signaling and reduced cell viability. These findings underscore the importance of efficient regulation of innate immune/TRAF6 signaling within HSPC by TIFAB, and its cooperation with miR-146a as it relates to the pathogenesis of hematopoietic malignancies, such as del(5q) MDS/AML. We performed an expression analysis on sorted lineage-Sca1+cKit+ (LSK) isolated from bone marrow (BM) of 3 month old mice transplanted with Tifab+/+ (WT) or Tifab-/- (KO) BM cells (n = 3 mice/group). We selected this time point to capture the gene expression profile of Tifab-/- LSK after engraftment but prior to overt hematopoietic failure. Total RNA was extracted, purified, reverse transcribed, labeled, and hybridized onto the GeneChip MoGene 2.0 ST Array (Affymetrix). Comparison comprises mRNA expression profile of Tifab+/+ LSK vs. Tifab-/- LSK.

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Trained immunity is facilitated by T cell-induced CD40-TRAF6 signaling [ChIP-seq]

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