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NADPH oxidase 4 limits bone mass by promoting osteoclastogenesis

Claudia Goettsch, Andrea Babelova, Olivia Trummer

    The Journal of Clinical Investigation
    |November 13, 2013
    PubMed

    Insights

    NADPH oxidase 4 (NOX4) drives bone loss by promoting osteoclast activity. Inhibiting NOX4 in osteoporosis models improved bone density, suggesting NOX4 as a therapeutic target.

    Area of Science:

    • Biochemistry
    • Cell Biology
    • Bone Biology

    Background:

    • Reactive oxygen species (ROS) are linked to bone diseases.
    • NADPH oxidase 4 (NOX4) is a key source of ROS and may contribute to bone disorders.

    Purpose of the Study:

    • To investigate the role of NOX4 in maintaining bone homeostasis.
    • To explore NOX4 as a potential therapeutic target for osteoporosis.

    Main Methods:

    • Studied Nox4(-/-) mice for bone density and osteoclast markers.
    • Analyzed osteoclast differentiation ex vivo and in vivo models of osteoporosis.
    • Assessed NOX4 expression in human bone samples and correlated a NOX4 SNP with bone density.

    Main Results:

    • Nox4(-/-) mice showed increased bone density and fewer osteoclasts.
    • NOX4 deficiency impaired osteoclastogenesis by inhibiting RANKL-induced NFATc1 and c-JUN activation.
    • Pharmacological or genetic NOX4 inhibition protected against ovariectomy-induced bone loss.
    • Human bone with high osteoclast activity and a NOX4 SNP showed increased NOX4 expression and reduced bone density.

    Conclusions:

    • NOX4 plays a significant role in bone homeostasis and osteoclast function.
    • NOX4 is implicated in bone loss associated with osteoporosis.
    • Targeting NOX4 presents a promising therapeutic strategy for treating osteoporosis.

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