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Tendinopathy is a disabling musculoskeletal disease, the pathological process of which is tightly associated with inflammation. Spironolactone (SP) has been widely used as a diuretic in clinical practice. Recently, SP has shown anti-inflammatory features in several diseases. Tendon-derived stem cells (TDSCs), a subset cell type from tendon tissue possessing clonogenic capacity, play a vital role in the pathological process of tendinopathy. In the present study, the protective effect of SP on TDSCs was demonstrated under simulated tendinopathy conditions both  in vitro  and  in vivo . SP contributed to the maintenance of TDSC-specific genes or proteins, while suppressing the interleukin- (IL-) 1 β -induced overexpression of inflammation-mediated factors. Additionally, IL-1 β -induced cellular senescence in TDSCs was inhibited, while autophagy was enhanced, as determined via  β -galactosidase activity, western blot (WB), and quantitative real-time polymerase chain reaction analysis. With the aid of several emerging bioinformatics tools, the mitogen-activated protein kinase (MAPK) pathway likely participated in the effect of SP, which was further validated through WB analysis and the use of MAPK agonist. Immunofluorescence analysis and an NF- κ B agonist were used to confirm the inhibitory effect of SP on IL-1 β -induced activation of the NF- κ B pathway. X-ray, immunofluorescence, immunohistochemistry, hematoxylin and eosin staining, histological grades, and Masson staining showed that SP ameliorated tendinopathy in an Achilles tenotomy (AT) rat model  in vivo . This work elucidates the protective role of SP on the pathological process of tendinopathy both  in vitro  and  in vivo , indicating a potential therapeutic strategy for tendinopathy treatment.

Spironolactone Ameliorates Senescence and Calcification by Modulating Autophagy in Rat Tendon-Derived Stem Cells via the NF-κB/MAPK Pathway