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An Immunomodulatory Transcriptional Signature Associated With Persistent Listeria Infection in Hepatocytes

An Immunomodulatory Transcriptional Signature Associated With Persistent Listeria Infection in Hepatocytes
Listeria monocytogenescauses severe foodborne illness in pregnant women and immunocompromised individuals. After the intestinal phase of infection, the liver plays a central role in the clearance of this pathogen through its important functions in immunity. However, recent evidence suggests that during long-term infection of hepatocytes, a subpopulation ofListeriamay escape eradication by entering a persistence phase in intracellular vacuoles. Here, we examine whether this long-term infection alters hepatocyte defense pathways, which may be instrumental for bacterial persistence. We first optimized cell models of persistent infection in human hepatocyte cell lines HepG2 and Huh7 and primary mouse hepatocytes (PMH). In these cells,Listeriaefficiently entered the persistence phase after three days of infection, while inducing a potent interferon response, of type I in PMH and type III in HepG2, while Huh7 remained unresponsive. RNA-sequencing analysis identified a common signature of long-termListeriainfection characterized by the overexpression of a set of genes involved in antiviral immunity and the under-expression of many acute phase protein (APP) genes, particularly involved in the complement and coagulation systems. Infection also altered the expression of cholesterol metabolism-associated genes in HepG2 and Huh7 cells. The decrease in APP transcripts was correlated with lower protein abundance in the secretome of infected cells, as shown by proteomics, and also occurred in the presence of APP inducers (IL-6 or IL-1β). Collectively, these results reveal that long-term infection withListeriaprofoundly deregulates the innate immune functions of hepatocytes, which could generate an environment favorable to the establishment of persistent infection.
- UNIVERSITE PARIS-SACLAY France
- Zhejiang Ocean University China (People's Republic of)
- Université Paris-Sud France
- French National Centre for Scientific Research France
- UNIVERSITE PARIS SUD France
570, Listeria, [SDV]Life Sciences [q-bio], 610, liver, Microbiology, transcriptomics, Mice, Cellular and Infection Microbiology, Pregnancy, acute phase response, Animals, Humans, Listeriosis, innate immunity, Secretome, cholesterol, interferon, persistence, Listeria monocytogenes, QR1-502, [SDV] Life Sciences [q-bio], Hepatocytes, Female, Persistent Infection
570, Listeria, [SDV]Life Sciences [q-bio], 610, liver, Microbiology, transcriptomics, Mice, Cellular and Infection Microbiology, Pregnancy, acute phase response, Animals, Humans, Listeriosis, innate immunity, Secretome, cholesterol, interferon, persistence, Listeria monocytogenes, QR1-502, [SDV] Life Sciences [q-bio], Hepatocytes, Female, Persistent Infection
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