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Induction of an Inflammatory Response in Primary Hepatocyte Cultures from Mice
Published on: March 10, 2017
Interleukin-1beta induces macrophage inflammatory protein-1beta expression in human hepatocytes
Ting Zhang1, Chang-Jiang Guo, Yuan Li
1Division of Allergy and Immunology, Joseph Strokes Jr. Research Institute at The Children's Hospital of Philadelphia, Department of Pediatrics, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA.
Insights
Interleukin-1beta (IL-1beta) boosts macrophage inflammatory protein (MIP)-1beta expression in liver cells. This IL-1beta pathway, involving NF-kappaB activation, may drive liver inflammation by recruiting immune cells.
Area of Science:
- Immunology
- Hepatology
- Molecular Biology
Background:
- CC-chemokines mediate immune responses and inflammation, crucial for understanding liver disease immunopathogenesis.
- Interleukin-1beta (IL-1beta) is a key cytokine involved in inflammatory processes.
- Macrophage inflammatory protein (MIP)-1beta is a CC-chemokine implicated in immune cell recruitment.
Purpose of the Study:
- To investigate the role of IL-1beta in regulating MIP-1beta expression in human hepatocytes.
- To elucidate the signaling pathway involved in IL-1beta-induced MIP-1beta expression.
Main Methods:
- Utilized human hepatocyte cell lines (Huh7 and HepG2).
- Measured MIP-1beta expression at mRNA and protein levels.
- Investigated the involvement of nuclear factor kappa B (NF-kappaB) signaling pathway using promoter activation assays and NF-kappaB inhibitor (CAPE).
Main Results:
- IL-1beta significantly upregulated both mRNA and protein levels of MIP-1beta in hepatocytes.
- Supernatants from monocyte-derived macrophages (MDMs) induced MIP-1beta expression, an effect dependent on IL-1beta.
- IL-1beta activated the NF-kappaB promoter in hepatocytes, and this activation was blocked by CAPE, which also inhibited IL-1beta-induced MIP-1beta expression.
Conclusions:
- IL-1beta enhances MIP-1beta production in hepatic cells.
- The IL-1beta-induced MIP-1beta expression is mediated through the NF-kappaB signaling pathway.
- This mechanism may contribute to sustained inflammatory cell recruitment and liver inflammation.
Abstract:
The investigation of factors that regulate expression of CC-chemokines, the important mediators in immune responses and inflammation processes, has an important significance in understanding the immunopathogenesis of liver diseases. We examined the role of interleukin-1beta (IL-1beta), a multifunctional cytokine, in regulating the expression of macrophage inflammatory protein (MIP)-1beta in human hepatocytes (Huh7 and HepG2). IL-1beta significantly enhanced MIP-1beta expression in these cells at both the mRNA and protein levels. Cytokine-enriched supernatants from monocyte-derived macrophage (MDM) cultures also induced MIP-1beta expression. IL-1beta is responsible for MDM supernatant-mediated up-regulation of MIP-1beta since the antibody to IL-1beta abolished MDM supernatant action. Investigation of the mechanism involved in MIP-1beta induction by IL-1beta showed that IL-1beta activated the nuclear factor kappa B (NF-kappaB) promoter in Huh7 cells. In addition, caffeic acid phenethyl ester (CAPE), a specific inhibitor of the activation of NF-kappaB, not only abolished IL-1beta-mediated NF-kappaB promoter activation, but also blocked IL-1beta-induced MIP-1beta expression. These observations suggest that IL-1beta-mediated up-regulation of MIP-1beta production in the hepatic cells may contribute a critical mechanism for continuous recruitment of inflammatory cell to liver and maintenance of inflammation.
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