Abstract
The pathogenesis of psoriatic arthritis (PsA) involves inflammation and bone and soft tissue turnover. Dietary fatty acids have previously been associated with pro-inflammatory effects induced by saturated fatty acids (SFA) and anti-inflammatory effects achieved by at least some polyunsaturated fatty acids (PUFA). The aim of the study was to investigate the correlations between the content of fatty acids in granulocytes and clinical and biochemical markers of PsA. A total of 140 patients with PsA were included. Skin and joint disease activity were assessed. Fatty acid composition in granulocytes was determined by gas chromatography. Competitive enzyme-linked immunosorbent assays were used to assess bone and soft tissue turnover. The content of SFA, n-6 PUFA or n-3 PUFA in granulocytes was not associated with disease activity. Marine n-3 PUFA was significantly positively correlated with collagen degradation. In contrast, n-6 PUFA was significantly positively correlated with collagen formation and negatively correlated with collagen degradation. However, the correlations were all weak. No association was found between the content of fatty acids in granulocytes and disease activity in this population of patients with PsA. The correlation between fatty acids and biomarkers of bone and soft tissue turnover needs further investigation.
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Funding
This work was supported by the Danish Research Foundation “Den Danske Forskningsfond”, the Innovation Fund Denmark (Innovationsfonden), the Danish Rheumatism Association and the Danish Psoriasis Foundation.
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Concept and design: All authors. Conduction of the trial: SK. Fatty acid analysis SK and EBS. Biomarker analysis: SHN and ACBJ. Drafting of the manuscript: SK. Statistical analysis: SK and SHN. Critical revision of the manuscript for important intellectual content: All authors. Supervision: EBS, JHC, MAK, ACBJ.
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SHN, ACBJ and MAK are full-time employee at Nordic Bioscience A/S. Nordic Bioscience is a privately owned, small–medium size enterprise (SME) partly focused on the development of biomarkers. MAK holds stocks in Nordic Bioscience A/S. None of the authors received fees, bonuses or other benefits for the work described in the manuscript.
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All participants gave their oral and written informed consent and the regional ethics committee of North Denmark approved the study (reference number N20120076). The study was approved by the Danish Data Protection Agency (2008-58-0028) and registered at ClinicalTrials.gov (NCT01818804). The study was conducted in accordance with the Declaration of Helsinki.
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Kristensen, S., Nielsen, S.H., Schmidt, E.B. et al. Are fatty acids associated with disease activity and biomarkers in patients with psoriatic arthritis? Data from a multicenter clinical trial. Rheumatol Int 42, 1009–1014 (2022). https://doi.org/10.1007/s00296-021-04953-w
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DOI: https://doi.org/10.1007/s00296-021-04953-w