Significantly modulated transcripts were noted upon viral (rock bream iridovirus [RBIV]), bacterial (Edwardsiella tarda and Streptococcus iniae), and pathogen-associated molecular pattern (lipopolysaccharide and poly I C) stimulations.
To pursue investigations on the role of RIPK1 during viral hepatitis, we exposed Ripk1LPC-KO and Ripk1fl/fl mice to a molecular pattern associated with viral infection, the poly I C.
Here, we use a knock-in luciferase reporter model to image Cox2 expression across a range of tissues in mice following treatment with the either the prototypical bacterial pathogen-associated molecular pattern (PAMP), LPS, which activates Toll-like receptor (TLR 4, or with poly(I C), a viral PAMP, which activates TLR3.
Mice deficient for RIPK1, specifically in liver parenchymal cells (Ripk1LPC-KO) and their wild-type littermates (Ripk1fl/fl), were challenged by either the murine hepatitis virus type 3 (MHV3) or poly I C, a synthetic analog of double-stranded RNA mimicking viral pathogen-associated molecular pattern.
The 3′-UTR (positioned at nucleotides 9389 9679 of the HCV genome) contains a poly(U/UC) (PU/UC) tract located at nucleotide positions 9436 9600, which was identified as an HCV pathogen-associated molecular pattern (PAMP) that triggers RLR-mediated type I IFN production.
Here TNF-α, which emerged from a response to a viral pathogen associated molecular pattern (PAMP) recognized by the TLR3, was most probably produced by Kupffer cells as their previous chemical depletion prevented the development of hepatitis in poly I C challenged Ripk1LPC-KO mice.
Microbe-Associated Molecular Pattern.
danger/damage-associated molecular pattern.
DAMPs damage-associated molecular pattern molecules; TLR toll-like receptor.
Most importantly, it is mainly characterized with release of marked amount of oligo- or poly-nucleosomes and their attached damage-associated molecular patterns (DAMPs) and initiated by caspase activation.
