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Exploring the Anti-Inflammatory Effect of Tryptanthrin by Regulating TLR4/MyD88/ROS/NF-κB, JAK/STAT3, and Keap1/Nrf2
Jie Zhu1, Wen Cheng1, Tian-Tian He1
1Co-construction Collaborative Innovation Center for Chinese Medicine Resources Industrialization by Shaanxi & Education Ministry, State Key Laboratory of Research & Development of Characteristic Qin Medicine Resources (Cultivation), Shaanxi University of Chinese Medicine, Xianyang 712083, China.
ACS Omega
|July 22, 2024
Summary
Tryptanthrin (TRYP), derived from Indigo Naturalis, demonstrates potent anti-inflammatory and antioxidant effects. It works by inhibiting key signaling pathways like NF-κB and JAK/STAT3, offering potential therapeutic benefits for inflammatory conditions.
Area of Science:
- Pharmacology
- Molecular Biology
- Immunology
Background:
- Tryptanthrin (TRYP) is a key compound in Indigo Naturalis with known anti-inflammatory properties.
- The precise molecular mechanisms underlying TRYP's anti-inflammatory activity remain largely unelucidated.
- Understanding these mechanisms is crucial for its therapeutic development.
Purpose of the Study:
- To investigate the anti-inflammatory and antioxidant mechanisms of Tryptanthrin (TRYP).
- To identify protein expression changes induced by TRYP in inflammatory models.
- To validate TRYP's effects in both in vitro and in vivo models of inflammation.
Main Methods:
- Proteomics analysis using tandem mass tag (TMT) technology to identify differentially expressed proteins.
- In vitro studies using lipopolysaccharide (LPS)-stimulated RAW264.7 cells.
- In vivo studies using a dextran sulfate sodium (DSS)-induced ulcerative colitis (UC) mouse model.
- Assays to measure nitric oxide (NO), cytokine levels (IL-6, TNF-α), and reactive oxygen species (ROS).
- Western blotting and nuclear translocation assays to assess signaling pathway activation (NF-κB, JAK/STAT3, Keap1/Nrf2).
Main Results:
- TRYP significantly reduced NO, IL-6, and TNF-α levels in LPS-stimulated cells.
- TRYP modulated the expression of proteins involved in inflammatory signaling, including gp91phox, p22phox, FcεRIγ, IKKα/β, and p-IκBα.
- TRYP treatment improved the health of mice with DSS-induced colitis.
- TRYP inhibited the activation of the TLR4/MyD88/ROS/NF-κB and JAK/STAT3 pathways.
- TRYP promoted antioxidant effects via the Keap1/Nrf2 pathway.
Conclusions:
- Tryptanthrin (TRYP) exhibits significant anti-inflammatory and antioxidant activities.
- TRYP exerts its effects by suppressing the TLR4/MyD88/ROS/NF-κB and JAK/STAT3 signaling pathways.
- TRYP also demonstrates antioxidant potential through the regulation of the Keap1/Nrf2 pathway.
- These findings provide a mechanistic basis for the therapeutic use of TRYP in inflammatory diseases.
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