Session Title: Biology and Pathology of Bone and Joint - Poster I
Session Type: ACR Poster Session C
Session Time: 9:00AM-11:00AM
Background/Purpose: The contribution of metabolic changes induced by high fat diet (HFD) to OA is poorly understood. We sought to determine if diet regulates longitudinal changes to metabolic factors that contribute to OA.
Methods: Mice were fed normal chow diet until 9 weeks of age and then placed onto HFD or lean diet (LD) for 18 weeks, followed by resumption of normal chow, and evaluated longitudinally up to 12 months of age. Some mice were subjected to surgically-induced OA at the end of special diet. Plasma and knee joints were collected at each time points.
Results: We determined that HFD significantly increased fasting blood glucose levels, body weight, BMI and leptin levels as compared to LD fed mice. Histopathological analysis using OARSI scoring clearly showed that HFD fed mice exhibited accelerated spontaneous OA at 9 months of age as well as acceleration in the surgically induced OA at 10 and 20 wks post surgery in comparison to LD fed mice. Of the 170 metabolites analysed in blood plasma at each time point, lysophosphatidyl choline analogues (lysoPCaC20:4, lysoPCaC17:0, lysoPCaC18:0) and one phosphatidyl choline analogue (PCaaC36:2) were increased longitudinally in the HFD fed mice. Our ongoing studies are now evaluating if these LysoPC metabolomics signatures are responsible for initiating and accelerating cartilage degradative process observed in HFD fed mice and if we may predict the osteoarthritis severity by using some biomarkers as well as the involvement of the leptin-driven pathway.
Conclusion: We identified that high fat diet induces and maintains selective metabolic changes and increases OA progression in both spontaneous and surgically induced OA. We anticipate that these identified metabolomics signatures are involved in OA pathogenesis during obesity and therapeutic modulation of leptin pathway may help to attenuate or reverse OA pathologies.
*PD & YZ has equal first author contribution
To cite this abstract in AMA style:Datta P, Zhang Y, Parousis A, Sharma A, Rossomacha E, Gandhi R, Rockel J, Kapoor M. High Fat Diet Induced Longitudinal Metabolic Changes Contribute to Acceleration of Osteoarthritis in Mice [abstract]. Arthritis Rheumatol. 2016; 68 (suppl 10). https://acrabstracts.org/abstract/high-fat-diet-induced-longitudinal-metabolic-changes-contribute-to-acceleration-of-osteoarthritis-in-mice/. Accessed December 13, 2019.
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ACR Meeting Abstracts - https://acrabstracts.org/abstract/high-fat-diet-induced-longitudinal-metabolic-changes-contribute-to-acceleration-of-osteoarthritis-in-mice/