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Investigation of the relationships between knee osteoarthritis and obesity via untargeted metabolomics analysis

  • Onur Senol
  • Gulsah GundogduEmail author
  • Koksal Gundogdu
  • Fatma Demirkaya Miloglu
Original Article
  • 45 Downloads

Abstract

Objective

Osteoarthritis (OA), the most encountered arthritis form, result from degeneration of articular cartilage. Obesity is accepted as a significant risk factor for knee OA (KOA). In this study, it is aimed to determine the variation of metabolites between control and patients with KOA and observe the effect of obesity on KOA via untargeted metabolomics method.

Methods

Serum samples of following groups were collected: patient group including 14 obesity (OKOA) and 14 non-obesity (NOKOA) (n = 28) and control group (n = 15) from orthopedics and traumatology policlinic. Serum proteins were denatured by acetonitrile and chromatographic separation of metabolites was achieved by LC/Q-TOF/MS/MS method. Data acquisition, classification, and identification were achieved by METLIN database. Cluster analysis was performed with MATLAB2017a-PLS Toolbox 7.2.

Results

Obtained results showed that 244 (patient vs control) and 274 (OKOA vs NOKOA) m/z ratios were determined in accordance with LC/Q-TOF/MS/MS analysis. Multivariate data analysis was applied 41 and 36 m/z signal (p ≤ 0.01; fold analysis > 1.5) were filtered for patient vs control group and OKOA vs NOKOA, respectively. Twenty-one different metabolites were identified for patient vs control group and 15 metabolites were determined for OKOA vs NOKOA group.

Conclusion

Acid concentration and oxidative stress agents were high in inflammation group and their levels were much higher in obesity. It is claimed that obesity cause oxidative stress and acidosis in arthritis patients. Valine was found to be the only BCAA molecule whose concentration has significantly different in KOA patients. The relation between KOA and obesity was firstly investigated with metabolomics method.

Keywords

Knee osteoarthritis LC/Q-TOF/MS/MS Untargeted metabolomics 

Notes

Acknowledgments

We thank all the study participants who made this study possible, and all the staff who helped us in the collection of samples and East Anatolia High Technology Application and Research Center (DAYTAM) for their kind contribution in Q-TOF analysis. We all thank to the contribution of Hospital La Fe Metabolomics Group, Prof. Dr. Maximo Vento, Dr. Julia Kuligowski and Dr. Guillermo Quintas.

Author contributors

Study design, OS, GG, FDM; collection of blood samples, KG; experiments, FDM, OS; metabolite profiling assay, GG; statistical analysis, GG, OS; writing of the manuscript, GG, FDM, OS, KG. All authors contributed to the critical comment on the final manuscript and approved the final manuscript.

Compliance with ethical standards

Disclosure

None.

Ethics approval

This study was conducted with the approval of the Ataturk University Ethics Committee.

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Copyright information

© International League of Associations for Rheumatology (ILAR) 2019

Authors and Affiliations

  1. 1.Analytical Chemistry Department, Faculty of PharmacyAtatürk UniversityErzurumTurkey
  2. 2.Department of Physiology, Faculty of MedicineAtatürk UniversityErzurumTurkey
  3. 3.Department of Orthopedics and TraumatologyErzurum Regional Training and Research HospitalErzurumTurkey

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