Abstract
Alendronate, a bisphosphonate used to prevent osteoporosis, stimulates osteogenesis but impairs adipogenesis. Different clinical trials suggest that the incidence of diabetes may be lower in patients treated with alendronate. Taking into account the importance of adipocytes and macrophages of adipose tissue in insulin resistance and type 2 diabetes, it is necessary to evaluate the effect of alendronate in both cell types. In this paper, we investigated the effect of alendronate on the differentiation to adipocytes of 3T3-L1 fibroblasts, the cell line most used to study adipogenesis, and also its effect on lipid content and oxidative stress in mature adipocytes as well as on the inflammatory response of macrophages. We found that alendronate inhibits differentiation of 3T3-L1 fibroblasts to adipocytes in keeping with reports in other cell lines. On the other hand, treatment of 3T3-L1 adipocytes with alendronate was able to decrease triglyceride content and to prevent H2O2-induced lipid peroxidation which was evaluated as an indicator of oxidative stress. In addition, it was found that activation of RAW 264.7 macrophages to a pro-inflammatory M1 type is inhibited by this bisphosphonate. These results suggest that alendronate may contribute to prevent adipocyte excessive enlargement and the induction of oxidative stress in 3T3-L1 adipocytes as well as the activation of macrophages to a pro-inflammatory M1 type, which are events associated with adipose tissue dysfunction and insulin resistance. In this study, we unraveled the underlying mechanisms of events that were previously observed in clinical trials.
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Funding
This work was supported by research grants PIP 11220130100768 (to M.V.) and PIP 11220150100188CO (to GY) from Consejo Nacional de Investigaciones Científicas y Técnicas of Argentina. The funders had no role in the study design, data and analysis, decision to publish, or preparation of the manuscript.
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Key Points
•Alendronate inhibits 3T3-L1 fibroblasts differentiation to adipocytes.
• Alendronate could decrease adipocyte lipid content and prevent excessive enlargement.
• Alendronate diminishes H2O2-induced increase in oxidative stress in 3T3-L1 adipocytes.
• Alendronate prevents polarization to a pro-inflammatory M1-type macrophage.
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Martini, C., Sosa, F.N., Malvicini, R. et al. Alendronate inhibits triglyceride accumulation and oxidative stress in adipocytes and the inflammatory response of macrophages which are associated with adipose tissue dysfunction. J Physiol Biochem 77, 601–611 (2021). https://doi.org/10.1007/s13105-021-00826-9
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DOI: https://doi.org/10.1007/s13105-021-00826-9