Single-cell RNA-seq ties macrophage polarization to growth rate of intracellular Salmonella
File(s)Saliba nat micro accepted version.docx (190.03 KB)
Accepted version
Author(s)
Type
Journal Article
Abstract
Intracellular bacterial pathogens can exhibit large heterogeneity in growth rate inside host cells, with major consequences for the infection outcome. If and how the host responds to this heterogeneity remains poorly understood. Here, we combined a fluorescent reporter of bacterial cell division with single-cell RNA-sequencing analysis to study the macrophage response to different intracellular states of the model pathogen Salmonella enterica serovar Typhimurium. The transcriptomes of individual infected macrophages revealed a spectrum of functional host response states to growing and non-growing bacteria. Intriguingly, macrophages harbouring non-growing Salmonella display hallmarks of the proinflammatory M1 polarization state and differ little from bystander cells, suggesting that non-growing bacteria evade recognition by intracellular immune receptors. By contrast, macrophages containing growing bacteria have turned into an anti-inflammatory, M2-like state, as if fast-growing intracellular Salmonella overcome host defence by reprogramming macrophage polarization. Additionally, our clustering approach reveals intermediate host functional states between these extremes. Altogether, our data suggest that gene expression variability in infected host cells shapes different cellular environments, some of which may favour a growth arrest of Salmonella facilitating immune evasion and the establishment of a long-term niche, while others allow Salmonella to escape intracellular antimicrobial activity and proliferate.
Date Issued
2016-11-14
Date Acceptance
2016-09-16
Citation
Nature Microbiology, 2016, 2 (2), pp.1-8
ISSN
2058-5276
Publisher
Nature Research
Start Page
1
End Page
8
Journal / Book Title
Nature Microbiology
Volume
2
Issue
2
Copyright Statement
© 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
Sponsor
Medical Research Council (MRC)
Medical Research Council (MRC)
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000397104900009&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Grant Number
MR/M009629/1
MR/M009629/1
Subjects
Science & Technology
Life Sciences & Biomedicine
Microbiology
BACTERIAL-INFECTIONS
EXPRESSION ANALYSIS
IMMUNE-RESPONSES
HOST RESPONSES
PATHOGEN
HETEROGENEITY
GENE
SMART-SEQ2
RECEPTORS
DIVERSITY
Publication Status
Published
Article Number
ARTN 16206
Date Publish Online
2016-11-14