Abstract
Cyclooxygenase (COX)-2 inhibitors, such as celecoxib, for chronic inflammatory disease are associated with adverse health events, while cis-9, trans-11 (c9t11) conjugated linoleic acid (CLA) is anti-inflammatory without adverse events attributed to pure intake. Mechanistically, celecoxib and c9t11 disrupt the arachidonic acid cascade; however, the equivalency of anti-inflammatory effects between these compounds is unknown. Therefore, to test the hypothesis that 0.5% dietary c9t11 reduces inflammation equivalently to a celecoxib dose intended to treat rheumatoid arthritis (RA; 5 mg/kg bw), arthritic mice received diets containing one of the following supplements: 1% corn oil (CO, w/w), 0.5% c9t11 (>91% purity) +0.5% CO, or 1% CO + 0.5, 5, or 50 mg/kg bw celecoxib, and were assessed for changes in arthritic severity over 6 weeks. Overall, arthritic severity in mice fed c9t11 was reduced (34%, P < 0.01) while celecoxib doses (0.5, 5, 50 mg/kg) reduced arthritic severity (16, 56, 48%, respectively) compared to CO-fed arthritic mice. Linear regression of the celecoxib dose-response showed 0.5% c9t11 (570 mg/kg bw) reduced arthritic severity equivalently to 1.5 mg/kg celecoxib. Interleukin-6 (IL-6) was increased in paws of arthritic mice fed CO compared to shams, but was decreased in arthritic groups fed 0.5% c9t11 and 5 mg/kg celecoxib, compared to arthritic mice fed CO (Ps ≤ 0.05). Additionally, paw and plasma IL-10 levels in arthritic mice were decreased by 5 mg/kg celecoxib, but were unaffected by c9t11 compared to CO. Results suggest dietary c9t11 may be an effective adjunct to COX-2 inhibition for treating chronic inflammation.
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Abbreviations
- ARA:
-
Arachidonic acid
- AUC:
-
Area under the curve
- c9t11:
-
cis-9, trans-11
- CA:
-
Collagen-induced arthritis
- CAS:
-
Clinical arthritic score
- CLA:
-
Conjugated linoleic acid
- CO:
-
Corn oil
- COX:
-
Cyclooxygenase
- IL:
-
Interleukin
- IMID:
-
Immune-mediated inflammatory disease
- NF-κB:
-
Nuclear factor-kappa B
- nsNSAID:
-
Nonselective non-steroidal anti-inflammatory drug
- PG:
-
Prostaglandin
- PLA:
-
Phospholipase
- PPAR:
-
Peroxisome proliferator-activated receptor
- TXA:
-
Thromboxane
- TNF:
-
Tumor necrosis factor
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Acknowledgements
The authors express their gratitude toward Shane Huebner for technical assistance. The authors thank Dawn Irish, Angel Guterriez-Velin, and Terry Jobsis for their assistance with animal husbandry. The authors would like to thank Peter Crump for his assistance with statistical analyses. This research was partially supported by a USDA Hatch Project Grant (MSN130802), patent royalties from the Wisconsin Alumni Research Foundation (WARF), and the College of Agricultural and Life Sciences at the University of Wisconsin-Madison.
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This project was partially supported by a USDA Hatch project grants (MSN130802), patent royalties from the Wisconsin Alumni Research Foundation (WARF), and the College of Agricultural and Life Sciences at the University of Wisconsin-Madison.
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Olson, J.M., Haas, A.W., Lor, J. et al. A Comparison of the Anti-Inflammatory Effects of Cis-9, Trans-11 Conjugated Linoleic Acid to Celecoxib in the Collagen-Induced Arthritis Model. Lipids 52, 151–159 (2017). https://doi.org/10.1007/s11745-016-4228-8
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DOI: https://doi.org/10.1007/s11745-016-4228-8