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01-08-2020 | Acetylcysteine | Original Article

N-Acetylcysteine Attenuates Lipopolysaccharide-Induced Osteolysis by Restoring Bone Remodeling Balance via Reduction of Reactive Oxygen Species Formation During Osteoclastogenesis

Authors: Guangqi Yan, Yan Guo, Jingwen Guo, Qiang Wang, Chunyu Wang, Xue Wang

Published in: Inflammation | Issue 4/2020

Abstract

Chronic inflammatory diseases affect bone and teeth health tremendously. Characterized by osteolytic lesion and hyperactive osteoclastogenesis, inflammatory bone diseases are short of effective therapeutics and therefore highlight the importance of understanding pathogenesis and developing ideal medications. Reactive oxygen species (ROS) play a prominent role in the innate immune response of activated macrophages, as well as in the physiological signaling of osteoclasts (OCs) differentiation. N-acetylcysteine (NAC) is a potent ROS scavenger and a potential option for treating diseases characterized by excessive ROS generation. However, whether NAC can protect physiological bone remodeling from in vivo inflammatory conditions is largely undefined. We applied NAC treatment on lipopolysaccharide (LPS)-induced inflammatory osteolysis mice model and found that NAC could attenuate bone erosion and protect mice against LPS-induced osteolysis, due to the suppressive effect on osteoclastogenesis and stimulated effect on osteogenesis. Moreover, in vitro study demonstrated that, in OC precursors (pre-OCs), LPS-stimulated expressions of OC marker genes, such as tartrate-resistant acid phosphatase type 5 (Acp5), cathepsin K (Ctsk), OC stimulatory transmembrane protein (Oc-stamp), dendritic cell–specific transmembrane protein (Dc-stamp), and nuclear factor of activated T cells 1 (NFATc1), were all reduced because of the NAC pretreatment, thereby adversely affecting OC function including F-actin ring formation and bone resorption. Further mechanism study showed that NAC blocked LPS-induced ROS formation in both macrophages and pre-OCs, cutting off the LPS-stimulated autocrine/paracrine mechanism during inflammatory osteolysis. Our findings reveal that NAC attenuates inflammatory osteolysis via the elimination of ROS formation during LPS-stimulated osteoclastogenesis, and provide a potential therapeutic approach to treat inflammatory bone disease.

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Title: N-Acetylcysteine Attenuates Lipopolysaccharide-Induced Osteolysis by Restoring Bone Remodeling Balance via Reduction of Reactive Oxygen Species Formation During Osteoclastogenesis
Authors: Guangqi Yan
Yan Guo
Jingwen Guo
Qiang Wang
Chunyu Wang
Xue Wang
Publication date: 01-08-2020
Publisher: Springer US
Keyword: Acetylcysteine
Published in: Inflammation / Issue 4/2020
Print ISSN: 0360-3997
Electronic ISSN: 1573-2576
DOI: https://doi.org/10.1007/s10753-020-01207-y

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N-Acetylcysteine Attenuates Lipopolysaccharide-Induced Osteolysis by Restoring Bone Remodeling Balance via Reduction of Reactive Oxygen Species Formation During Osteoclastogenesis

Abstract

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Abstract

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