DGCR8 deficiency impairs macrophage growth and unleashes the interferon response to mycobacteria

Language
en
Document Type
Article
Issue Date
2022-05-18
First published
2021-03-26
Issue Year
2021
Authors
Killy, Barbara
Bodendorfer, Barbara
Mages, Jörg
Ritter, Kristina
Schreiber, Jonathan
Hölscher, Christoph
Pracht, Katharina
Ekici, Arif
Jäck, Hans-Martin
Lang, Roland
Editor
Publisher
Life Science Alliance LLC
Abstract

The mycobacterial cell wall glycolipid trehalose-6,6-dimycolate (TDM) activates macrophages through the C-type lectin receptor MINCLE. Regulation of innate immune cells relies on miRNAs, which may be exploited by mycobacteria to survive and replicate in macrophages. Here, we have used macrophages deficient in the microprocessor component DGCR8 to investigate the impact of miRNA on the response to TDM. Deletion of DGCR8 in bone marrow progenitors reduced macrophage yield, but did not block macrophage differentiation. DGCR8-deficient macrophages showed reduced constitutive and TDM-inducible miRNA expression. RNAseq analysis revealed that they accumulated primary miRNA transcripts and displayed a modest type I IFN signature at baseline. Stimulation with TDM in the absence of DGCR8 induced overshooting expression of IFNβ and IFN-induced genes, which was blocked by antibodies to type I IFN. In contrast, signaling and transcriptional responses to recombinant IFNβ were unaltered. Infection with live Mycobacterium bovis Bacille Calmette–Guerin replicated the enhanced IFN response. Together, our results reveal an essential role for DGCR8 in curbing IFNβ expression macrophage reprogramming by mycobacteria.

Journal Title
Life Science Alliance
Volume
4
Issue
6
Citation

Life Science Alliance 4.6 (2021): e202000810. https://www.life-science-alliance.org/content/4/6/e202000810

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