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Tea polyphenols attenuate liver inflammation by modulating obesity-related genes and down-regulating COX-2 and iNOS
Sajid Ur Rahman1, Yingying Huang1, Lei Zhu1
1College of Animal Science and Technology, Anhui Agricultural University, 130 West Changjiang Road, Hefei, 230036, China.
Background:
Tea polyphenols (TPs) attenuate obesity related liver inflammation; however, the anti-obesity effects and anti-inflammatory mechanisms are not clearly understood. This study aimed to determine whether the anti-obesity and anti-inflammatory TPs mechanisms associated with cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS) expression levels, and obesity-related gene response in dogs.
Results:
Dogs fed TPs displayed significantly decreased (p < 0.01) mRNA expression of tumor necrosis factor-α (TNF-α), interleukin-1 beta (IL-1β), and interleukin-6 (IL-6) compared to dogs that consumed high-fat diet (HFD) alone. TPs significantly (p < 0.01) inhibited COX-2 and iNOS expression level, and decreased liver fat content and degeneration.
Conclusion:
These results suggested that TPs act as a therapeutic agent for obesity, liver inflammation, and fat degeneration via COX-2 and iNOS inhibition, with TNF-α, IL-1β, and IL-6 involvement.
Insights
Tea polyphenols (TPs) reduce obesity-related liver inflammation in dogs by inhibiting key inflammatory markers like cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS). This study clarifies TPs
Area of Science:
- Veterinary Medicine
- Nutritional Science
- Molecular Biology
Background:
- Obesity is linked to liver inflammation, but the mechanisms of tea polyphenols (TPs) remain unclear.
- Understanding TPs' anti-obesity and anti-inflammatory effects is crucial for therapeutic development.
Purpose of the Study:
- To investigate the anti-obesity and anti-inflammatory mechanisms of TPs in dogs.
- To examine the association between TPs, cyclooxygenase-2 (COX-2), inducible nitric oxide synthase (iNOS), and obesity-related gene expression.
Main Methods:
- Administered TPs to dogs on a high-fat diet (HFD).
- Measured mRNA expression of inflammatory cytokines (TNF-α, IL-1β, IL-6), COX-2, and iNOS.
- Assessed liver fat content and degeneration.
Main Results:
- TPs significantly reduced mRNA expression of TNF-α, IL-1β, and IL-6 compared to HFD alone.
- TPs significantly inhibited COX-2 and iNOS expression.
- TPs decreased liver fat content and degeneration.
Conclusions:
- TPs demonstrate therapeutic potential for obesity, liver inflammation, and fat degeneration in dogs.
- TPs exert their effects through the inhibition of COX-2 and iNOS pathways.
- The anti-inflammatory actions of TPs involve the modulation of TNF-α, IL-1β, and IL-6.
