Abstract
Purpose
To investigate the effect of cocoa powder supplementation on obesity-related inflammation in high fat (HF)-fed obese mice.
Methods
Male C57BL/6J (n = 126) were fed with either low-fat (LF, 10 % kcal from fat) or HF (60 % kcal from fat) diet for 18 weeks. After 8 weeks, mice from HF group were randomized to HF diet or HF diet supplemented with 8 % cocoa powder (HF–HFC group) for 10 weeks. Blood and tissue samples were collected for biochemical analyses.
Results
Cocoa powder supplementation significantly reduced the rate of body weight gain (15.8 %) and increased fecal lipid content (55.2 %) compared to HF-fed control mice. Further, cocoa supplementation attenuated insulin resistance, as indicated by improved HOMA-IR, and reduced the severity of obesity-related fatty liver disease (decreased plasma alanine aminotransferase and liver triglyceride) compared to HF group. Cocoa supplementation also significantly decreased plasma levels of the pro-inflammatory mediators interleukin-6 (IL-6, 30.4 %), monocyte chemoattractant protein-1 (MCP-1, 25.2 %), and increased adiponectin (33.7 %) compared to HF-fed mice. Expression of pro-inflammatory genes (Il6, Il12b, Nos2, and Emr1) in the stromal vascular fraction (SVF) of the epididymal white adipose tissue (WAT) was significantly reduced (37–56 %) in the cocoa-supplemented mice.
Conclusions
Dietary supplementation with cocoa ameliorates obesity-related inflammation, insulin resistance, and fatty liver disease in HF-fed obese mice, principally through the down-regulation of pro-inflammatory gene expression in WAT. These effects appear to be mediated in part by a modulation of dietary fat absorption and inhibition of macrophage infiltration in WAT.
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Abbreviations
- ALT:
-
Alanine aminotransferase
- ATM:
-
Adipose tissue-associated macrophage
- DP:
-
Degree of polymerization
- HF:
-
High fat
- HFC:
-
High-fat diet supplemented with 8 % cocoa powder
- HOMA-IR:
-
Homeostasis model assessment of insulin resistance
- IL:
-
Interleukin
- iNOS:
-
Inducible nitric oxide synthase
- LF:
-
Low fat
- MCP-1:
-
Monocyte chemoattractant protein-1
- NO:
-
Nitric oxide
- ORFLD:
-
Obesity-related fatty liver disease
- PAC:
-
Proanthocyanidin
- SVF:
-
Stromal vascular fraction
- TNF-α:
-
Tumor necrosis factor-α
- WAT:
-
White adipose tissue
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Acknowledgments
The authors would like to acknowledge Dr. Sarah Forester, Ms. Sudathip Sae-tan, Ms. Tongtong Xu, Ms. Ling Tao, Mr. Zachary Bitzer, and Ms. Amy Brownschidle for technical assistance.
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Gu, Y., Yu, S. & Lambert, J.D. Dietary cocoa ameliorates obesity-related inflammation in high fat-fed mice. Eur J Nutr 53, 149–158 (2014). https://doi.org/10.1007/s00394-013-0510-1
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DOI: https://doi.org/10.1007/s00394-013-0510-1