Sequential induction of type I and II interferons mediates a long-lasting gene induction in the liver in response to a novel toll-like receptor 9 agonist.

Abstract:

BACKGROUND & AIMS:The toll-like receptor 9 (TLR9) agonist IMO-2125 is currently evaluated in clinical trials for chronic hepatitis C therapy. The aim of this study was to investigate the in vivo mode of action of a closely related compound, referred to as immunomodulatory oligonucleotide (IMO). METHODS:We analyzed the Jak-STAT pathway activation and induction of interferon-stimulated genes in the liver of wild type, interferon-α/β receptor-deficient and interferon-γ-deficient mice, after administration of IMO. RESULTS:IMO induced a prolonged activation of the Jak-STAT pathway and upregulation of interferon-stimulated genes in the mouse liver. Contrary to the response observed after interferon-α injection, the signalling induced by IMO was not abrogated following repeated administration. At early time points after IMO injection, STAT1 phosphorylation and interferon-stimulated gene induction required a functional interferon-α/β receptor, whereas at the later time points, the activation was type I interferon-independent. Microarray analysis revealed that IMO induced a broad transcriptional response in the mouse liver. This included upregulation of cytokine and chemokine genes responsible for recruitment of IFN-γ producers, such as T cells and natural killer cells. Interferon-γ-deficient mice showed a transient response to IMO, demonstrating the central role of interferon-γ in sustained activation of Jak-STAT pathway by IMO. CONCLUSIONS:The bimodal kinetics of response to IMO in the mouse liver are driven by the sequential endogenous production of type I and II interferons. The lack of refractoriness to IMO, combined with the long-lasting induction of interferon-stimulated genes, reveals a favourable pharmacodynamics profile of this novel TLR9 agonist for the treatment of chronic viral hepatitis.

journal_name

J Hepatol

journal_title

Journal of hepatology

authors

Makowska Z,Blumer T,Duong FH,La Monica N,Kandimalla ER,Heim MH

doi

10.1016/j.jhep.2012.11.038

subject

Has Abstract

pub_date

2013-04-01 00:00:00

pages

743-9

issue

4

eissn

0168-8278

issn

1600-0641

pii

S0168-8278(12)00908-7

journal_volume

58

pub_type

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