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Inherited human c-Rel deficiency disrupts myeloid and lymphoid immunity to a variety of infectious agents [primary T and B cells]

ABSTRACT: We investigated transcriptional responses following in vitro stimulation of peripheral blood naive CD4+ T cells and naive B cells obtained from a patient with inherited c-Rel deficiency. Samples from unrelated healthy donors and a patient with CD40 deficiency were analyzed for comparison.

ORGANISM(S): Homo sapiens

PROVIDER: GSE166872 | GEO | 2021/08/31

REPOSITORIES: GEO

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Inherited human c-Rel deficiency disrupts myeloid and lymphoid immunity to a variety of infectious agents [EBV B-cells]

Project description:We investigated transcriptional responses following in vitro stimulation of EBV-B cells derived from a patient with inherited c-Rel deficiency.

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Inherited human c-Rel deficiency disrupts myeloid and lymphoid immunity to a variety of infectious agents

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Inherited human c-Rel deficiency disrupts myeloid and lymphoid immunity to a variety of infectious agents

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Inherited human c-REL deficiency disrupts adaptive immunity

Project description:Various inborn errors of the canonical NF-kB pathway underlie different forms of human immunodeficiency. However, no patients with autosomal recessive complete deficiencies of RelA, c-REL, or NF-kB1, the three core members of the canonical NF-kB pathway, have yet been identified. We report a child homozygous for a loss-of-expression mutation of REL, encoding c-REL, which is expressed principally in myeloid and lymphoid cells. The distribution of myeloid subsets is normal in this patient, but in vitro-derived monocytes and cDC1s, unlike cDC2s, have impaired IL-12 and IL-23 production. The patient has low frequencies of memory CD4+ T cells, Th1*, Th2, Tregs, and almost no memory B cells. The frequencies of the other lymphoid subsets are normal. The patient’s naïve and memory CD4+ T cells produce only small amounts of IL-2, and the addition of this interleukin rescues their proliferation in response to mitogens, but not to antigens, in vitro. However, we found that HLA-syngeneic control cDCs rescued the proliferation of these cells in response to recall antigens. The production of key effector cytokines, such as IL-4, IL-17A, and IFNg, by memory CD4+ T cells was also highly impaired ex vivo, as was the differentiation of naïve CD4+ T cells into Th1 and Th17 cells in vitro. Both the survival and proliferation of the patient’s naïve B cells were found to be compromised, preventing B-cell differentiation into immunoglobulin (Ig)-secreting plasmablasts in vitro. As a consequence of this pleiotropic effect, this child suffered from severe viral, mycobacterial, fungal, and parasitic infections, while IgG substitution treatment prevented pyogenic infections. The immunological and infectious phenotypes were of hematopoietic origin, as they were cured by hematopoietic stem cell transplantation. Inherited human c-REL deficiency impairs multiple core functions of DCs, T cells, and B cells, thereby disrupting adaptive immunity to multiple infections.

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Project description:Myeloid-derived suppressor cells (MDSCs) are a heterogeneous population of leukocytes that are important for tumorigenesis and tumor immunotherapy. They comprise up to 10% of leukocytes in the blood of tumor patients and their depletion may be required for successful tumor immunotherapy. However, the identity of MDSCs remains obscure, primarily due to their heterogeneity and lack of a known lineage-specific transcription factor specifying their differentiation. Using single-cell transcriptomics and gene knockout approaches, we now describe a subset of murine and human myeloid suppressor cells, named rel-dependent monocytes (rMos), which are programmed by the transcription factor c-Rel of the NF-B family. Unlike MDSCs described previously, the c-Rel-dependent monocytes expressed a high amount of the proinflammatory cytokine IL-1β together with a low level of suppressive molecule arginase 1. Both in vitro and in tumor-bearing mice, these c-Rel+IL-1βhiArg1 monocytes promoted tumor growth by potently suppressing T cell function and showed a strong migratory phenotype, all of which were impaired by c-Rel deficiency or inhibition. Mechanistic studies revealed that c-Rel controlled the expression of monocyte signature genes through a unique transcriptional complex called the c-Rel enhanceosome, and IL-1CCL2 crosstalk between tumor cells and the rel-dependent monocytes maintained the suppressive tumor microenvironment. Thus, c-Rel specifies the development of a suppressive monocyte population and could be selectively targeted for treating cancer.

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