Journal
AUTOPHAGY
Volume 9, Issue 8, Pages 1253-1255Publisher
LANDES BIOSCIENCE
DOI: 10.4161/auto.25467
Keywords
TNF alpha; arthritis; autophagy; bone resorption; osteoclasts
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Autophagy describes the degradation of unnecessary or dysfunctional cellular components through the lysosomal machinery. Autophagy is essentially required to prevent accumulation of cellular damage and to ensure cellular homeostasis. Indeed, impaired autophagy has been implicated in a variety of different diseases. We examined the role of autophagy in inflammatory bone loss. We demonstrated that autophagy is activated by the pro-inflammatory cytokine tumor necrosis factor (TNF/TNF) in osteoclasts of patients with rheumatoid arthritis (RA). Autophagy induces osteoclast differentiation and stimulates osteoclast-mediated bone resorption in vitro and in vivo, thereby highlighting autophagy as a novel mediator of TNF-induced bone resorption.
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