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Screening Assays to Characterize Novel Endothelial Regulators Involved in the Inflammatory Response
Published on: September 15, 2017
The HEAT repeat protein MROH7 regulates the inflammatory macrophage response via LBP acetylation
Hangchao Zhang1, Jian Fu1, Yan Guo1
1State Key Laboratory of Swine and Poultry Breeding Industry, Guangdong Laboratory of Lingnan Modern Agriculture, College of Animal Science, South China Agricultural University, Guangzhou 510642, China.
Abstract:
Inflammatory macrophages (M1 macrophages) and interleukin-1β (IL-1β) serve as critical mediators of inflammatory response and antimicrobial defense in the immune system. Our preliminary investigation identified the HEAT repeat protein (maestro heat-like repeat family member 7, MROH7) as a potential regulator of IL-1β; however, its function in macrophages remains unexplored. In this study, we demonstrated that MROH7 inhibits IL-1β production in M1 macrophages. Mechanistically, MROH7 facilitates the acetylation of lipopolysaccharide-binding protein (LBP) through accumulating intracellular arachidonic acid (AA), thereby promoting its degradation and inhibiting the nuclear factor κB (NF-κB) signaling pathway. Additionally, mice with the myeloid depletion of Mroh7 exhibit an aggravated inflammatory response in lipopolysaccharide (LPS)-induced systemic inflammation. In summary, our study establishes MROH7 as a regulator in macrophage-mediated inflammation, providing critical insights into potential therapeutic targets for inflammatory disorders.
Insights
Maestro heat-like repeat family member 7 (MROH7) protein inhibits interleukin-1β (IL-1β) production in inflammatory macrophages. MROH7 regulates inflammation by promoting lipopolysaccharide-binding protein degradation and inhibiting the NF-κB pathway.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- Inflammatory macrophages (M1) and interleukin-1β (IL-1β) are key in immune responses.
- The role of Maestro heat-like repeat family member 7 (MROH7) in macrophages was previously unknown.
Purpose of the Study:
- To investigate the function of MROH7 in M1 macrophages.
- To elucidate the molecular mechanisms by which MROH7 regulates inflammation.
Main Methods:
- Investigated MROH7's effect on IL-1β production in M1 macrophages.
- Analyzed MROH7's role in lipopolysaccharide-binding protein (LBP) acetylation and degradation.
- Examined the impact of MROH7 on the nuclear factor κB (NF-κB) signaling pathway.
- Utilized Mroh7 myeloid-depleted mice to study lipopolysaccharide (LPS)-induced systemic inflammation.
Main Results:
- MROH7 was found to inhibit IL-1β production in M1 macrophages.
- MROH7 promotes LBP acetylation and degradation by accumulating arachidonic acid (AA).
- MROH7 inhibits the NF-κB signaling pathway.
- Mroh7 myeloid-depleted mice showed exacerbated inflammatory responses in LPS-induced inflammation.
Conclusions:
- MROH7 acts as a negative regulator of inflammation in macrophages.
- MROH7's mechanism involves regulating LBP stability and NF-κB signaling.
- MROH7 represents a potential therapeutic target for inflammatory diseases.
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