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Updated: Jun 3, 2026
09:20
An Adipocyte Cell Culture Model to Study the Impact of Protein and Micro-RNA Modulation on Adipocyte Function
Published on: May 4, 2021
NMI Regulates Adipose Adaptive Thermogenesis Through TLR4/IRF3 Signaling to Promote Obesity
Ting-Ting Li1,2, Xin-Yuan Zhao3,4,5, Min Zhang1,2
1Zhongshan School of Medicine, Sun Yat-sen University Shenzhen Campus, Sun Yat-sen University, Shenzhen, China.
Summary
Researchers discovered N-Myc and STAT interactor (NMI) as a key factor in obesity. This stress-responsive adipokine suppresses energy expenditure, worsening metabolic dysfunction, but can be targeted for therapeutic benefit.
Area of Science:
- Metabolic disease research
- Adipose tissue biology
- Inflammation and immunity
Background:
- Obesity-associated inflammation involves damage-associated molecular patterns (DAMPs).
- The direct role of DAMPs in suppressing energy expenditure and exacerbating metabolic dysfunction is not fully understood.
Purpose of the Study:
- To identify novel adipokines involved in regulating energy expenditure.
- To elucidate the mechanisms by which inflammatory cues impact metabolic rate.
- To explore therapeutic targets for obesity and related metabolic disorders.
Main Methods:
- Investigated N-Myc and STAT interactor (NMI) as a stress-responsive adipokine.
- Utilized genetic ablation of Nmi in mouse models of diet-induced obesity (DIO).
- Analyzed NMI's effects on thermogenesis, adipose tissue browning, and inflammatory signaling pathways (TLR4/IRF3).
- Assessed therapeutic potential using a monoclonal antibody against NMI.
Main Results:
- NMI expression and secretion increase in adipocytes under dietary stress and inflammation.
- Genetic deletion of Nmi protects against DIO by enhancing energy expenditure and cold tolerance.
- NMI activates TLR4/IRF3 signaling, repressing key thermogenic regulators (PPARα, PGC-1α, UCP1).
- NMI neutralization ameliorates obesity and reduces adipose tissue inflammation in DIO mice.
Conclusions:
- NMI is a stress-responsive adipokine that suppresses adaptive thermogenesis.
- NMI links inflammatory signaling to reduced energy expenditure, contributing to metabolic dysfunction.
- Targeting NMI offers a potential therapeutic strategy for obesity and metabolic disorders.
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