Abstract
Objective
To investigate the effect of caffeic acid phenethyl ester (CAPE) on local and systemic inflammation and bone loss in collagen antibody-induced arthritis (CAIA) mice.
Methods
Four groups of mice (n = 8 per group) were allocated; control, CAPE (1 mg/kg), CAIA and CAIA + CAPE (1 mg/kg). Local inflammation and bone loss were evaluated using clinical paw scores, in vivo micro-computed tomography (micro-CT), histological assessment and tartrate-resistant acid phosphatase (TRAP) staining. Serum levels of C-reactive protein (CRP) and C-terminal telopeptide (CTX-1) were measured by ELISA. Jejunum and colon sections were evaluated histopathologically for damage and toxicity.
Results
Greater paw scores and percentage change in paw volume were observed in CAIA + CAPE compared to the control groups (p < 0.05). Bone volume over time remained unchanged (p = 0.94) and the number of multinucleated TRAP-positive cells was greatest in CAIA + CAPE mice (p < 0.05). CRP and CTX-1 levels did not differ between groups. CAIA + CAPE mice exhibited lower colon toxicity scores and a reduced percentage of cavitated goblet cells in the colon crypts compared with CAIA mice (p = 0.026 and p = 0.003, respectively). Histopathology in the jejunum was not altered.
Conclusion
CAPE did not reduce paw inflammation or bone loss in CAIA mice. CAPE reduced histopathological changes in the colon of CAIA mice.
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Abbreviations
- CAPE:
-
Caffeic acid phenethyl ester
- CAIA:
-
Collagen antibody-induced arthritis
- CTX-1:
-
C-terminal telopeptide
- RA:
-
Rheumatoid arthritis
- NF-κB:
-
Nuclear factor-kappa B
- TRAP:
-
Tartrate-resistant acid phosphatase
- BV:
-
Bone volume
- PV:
-
Paw volume
- TNF-α:
-
Tumour necrosis factor alpha
- DMARDs:
-
Disease-modifying anti-rheumatic drugs
- PE:
-
Polyethylene
- micro-CT:
-
Micro-computed tomography
- CRP:
-
C-reactive protein
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Authors’ contributions
BW, VM and ET carried out the animal model. ET, TC, RS, RG and BW carried out the immunoassays and immunohistochemical staining and analysis. MC, TC and AD conceived the study and participated in the experimental design and data interpretation. EP and BW carried out micro-CT scans and analysis. BW, EP and RS performed the statistical analysis. All authors contributed to the manuscript and read and approved the final manuscript.
Acknowledgements
This project was kindly funded by The Estate of the Late Marion Alice Simpson, Arthritis Australia. The professional assistance received throughout this study: Mr. Victor Marino, Mr. Richard Bright and Dr. Jiake Xu for assistance with the animal model. Dr. Egon Perilli for his ongoing help with micro-CT analysis and Adelaide Microscopy, specifically Ruth Williams for her guidance with the SkyScan 1076. The University of Adelaide Animal Laboratory Services for animal handling training and assistance with the animal model. The University of Adelaide, School of Medicine, Histology Services for their assistance with processing and cutting tissues.
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The study was approved by the Animal Ethics Committee of the University of Adelaide (M-2014-175) and complied with National Health and Research Council (Australia) Code of Practice for Animal Care in Research and Training (2014). All applicable international, national and/or institutional guidelines for the care and use of animals were followed.
Funding
This project was kindly funded by The Estate of the Late Marion Alice Simpson, Arthritis Australia. The funding body was not involved in the design of the study or collection, analysis and interpretation of the data.
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Williams, B., Tsangari, E., Stansborough, R. et al. Mixed effects of caffeic acid phenethyl ester (CAPE) on joint inflammation, bone loss and gastrointestinal inflammation in a murine model of collagen antibody-induced arthritis. Inflammopharmacol 25, 55–68 (2017). https://doi.org/10.1007/s10787-016-0306-z
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DOI: https://doi.org/10.1007/s10787-016-0306-z