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Interleukin-20 exacerbates acute hepatitis and bacterial infection by downregulating IκBζ target genes in hepatocytes. | LitMetric

AI Article Synopsis

  • IL-20 is a cytokine that remains largely unexplored, unlike its counterparts IL-10 and IL-22, which have known anti-inflammatory properties and protective roles in the liver.
  • In experiments with Il20 knockout mice, these mice showed resistance to acute hepatitis and bacterial infection due to elevated levels of the protective cytokine IL-6, which is normally inhibited by IL-20's action on liver cells.
  • The study suggests that IL-20 contributes to worsening liver conditions and infections by inhibiting IL-6 and enhancing the expression of certain liver proteins, indicating that targeting IL-20 could be a potential treatment for liver diseases.

Article Abstract

Background & Aims: Interleukin (IL)-20 and IL-22 belong to the IL-10 family. IL-10 is a well-documented anti-inflammatory cytokine while IL-22 is well known for epithelial protection and its antibacterial function, showing great therapeutic potential for organ damage; however, the function of IL-20 remains largely unknown.

Methods: Il20 knockout (Il20) mice and wild-type littermates were generated and injected with Concanavalin A (ConA) and Klebsiella pneumoniae (K.P.) to induce acute hepatitis and bacterial infection, respectively.

Results: Il20 mice were resistant to acute hepatitis and exhibited selectively elevated levels of the hepatoprotective cytokine IL-6. Such selective inhibition of IL-6 by IL-20 was due to IL-20 targeting hepatocytes that produce high levels of IL-6 but a limited number of other cytokines. Mechanistically, IL-20 upregulated NAD(P)H: quinone oxidoreductase 1 (NQO1) expression and subsequently promoted the protein degradation of transcription factor IκBζ, resulting in selective downregulation of the IκBζ-dependent gene Il6 as well several other IκBζ-dependent genes including lipocalin-2 (Lcn2). Given the important role of IL-6 and LCN2 in limiting bacterial infection, we examined the effect of IL-20 on bacterial infection and found Il20 mice were resistant to K.P. infection and exhibited elevated levels of hepatic IκBζ-dependent antibacterial genes. Moreover, IL-20 upregulated hepatic NQO1 by binding to IL-22R1/IL-20R2 and activating ERK/p38MAPK/NRF2 signaling pathways. Finally, the levels of hepatic IL1B, IL20, and IκBζ target genes were elevated, and correlated with each other, in patients with severe alcoholic hepatitis.

Conclusions: IL-20 selectively inhibits hepatic IL-6 production rather than exerting IL-10-like broad anti-inflammatory properties. Unlike IL-22, IL-20 aggravates acute hepatitis and bacterial infection. Thus, anti-IL-20 therapy could be a promising option to control acute hepatitis and bacterial infection.

Lay Summary: Several interleukin (IL)-20 family cytokines have been shown to play important roles in controllimg inflammatory responses, infection and tissue damage, but the role of IL-20 remains unclear. Herein, we elucidated the role of IL-20 in liver disease and bacterial infection. We show that IL-20 can aggravate hepatitis and bacterial infection; thus, targeting IL-20 holds promise for the treatment of patients with liver disease.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8323118PMC
http://dx.doi.org/10.1016/j.jhep.2021.02.004DOI Listing

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