Effects of resveratrol on rheumatic symptoms and hepatic metabolism of arthritic rats
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Mellina S. Simões
Abstract
Objectives
Resveratrol has been studied as a potential agent for treating rheumatic conditions; however, this compound suppresses glucose synthesis and glycogen catabolism when infused in perfused livers of both arthritic and healthy rats. This study investigated the effects of oral administration of resveratrol on inflammation and liver metabolism in rats with arthritis induced by Freund’s adjuvant, which serves as rheumatoid arthritis model.
Methods
Holtzman rats, both healthy and exhibiting arthritic symptoms, were orally treated with resveratrol at doses varying from 25 to 500 mg/kg for a 5-day period preceding arthritis induction, followed by an additional 20-day period thereafter. Paw edema, arthritic score and hepatic myeloperoxidase activity were assessed to evaluate inflammation. Glycogen catabolism and gluconeogenesis from lactate were respectively evaluated in perfused livers from fed and fasted rats.
Results
Resveratrol decreased the liver myeloperoxidase activity at doses above 100 mg/kg, and decreased the paw edema and delayed the arthritic score at doses above 250 mg/kg. The hepatic gluconeogenesis was decreased in arthritic rats and resveratrol did not improve it. However, resveratrol did not negatively modify the gluconeogenesis in livers of healthy and arthritic rats. Glycogen catabolism was in part and slightly modified by resveratrol in the liver of arthritic and healthy rats.
Conclusions
It is improbable that resveratrol negatively affects the liver metabolism, especially considering that gluconeogenesis is highly fragile to changes in cellular architecture. The findings suggest that resveratrol could serve as alternative for treating rheumatoid arthritis. Nevertheless, prudence is advised regarding its transient effects on liver metabolism.
Award Identifier / Grant number: 312464/2020-7
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Research ethics: The authors are accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. Experiments were performed under a project license (NO.: 2495130916) granted by the Ethics Committee for Animal Experimentation (CEUA) of the State University of Maringá (UEM), in compliance with the guidelines of the Brazilian Council for the Control of Animal Experimentation (CONCEA).
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Informed consent: Not applicable.
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Author contributions: All the authors have accepted responsibility for the entire content of this manuscript and approved submission. Individual contributions: (I) conception and design: Jurandir F Comar; (II) administrative support: all authors; (III) provision of study materials or patients: none; (IV) collection and assembly of data: Mellina S Simões, Ana Beatriz P. Souza, Francielli M S Silva-Comar, Lívia Bracht and Anacharis B Sá-Nakanishi; (V) data analysis and interpretation: Jurandir F Comar, Roberto K N Cuman, Rosane M Peralta, Ciomar A Bersani-Amado and Adelar Bracht; (VI) manuscript writing: all authors; (VII) final approval of manuscript: all authors.
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Competing interests: The authors declare that no competing interest exists.
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Research funding: Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Grant number: 312464/2020-7.
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Data availability: The raw data can be obtained on request from the corresponding author.
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Supplementary Material
This article contains supplementary material (https://doi.org/10.1515/jcim-2024-0200).
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