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Wnt signaling and cellular metabolism in osteoblasts

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Abstract

The adult human skeleton is a multifunctional organ undergoing continuous remodeling. Homeostasis of bone mass in a healthy adult requires an exquisite balance between bone resorption by osteoclasts and bone formation by osteoblasts; disturbance of such balance is the root cause for various bone disorders including osteoporosis. To develop effective and safe therapeutics to modulate bone formation, it is essential to elucidate the molecular mechanisms governing osteoblast differentiation and activity. Due to their specialized function in collagen synthesis and secretion, osteoblasts are expected to consume large amounts of nutrients. However, studies of bioenergetics and building blocks in osteoblasts have been lagging behind those of growth factors and transcription factors. Genetic studies in both humans and mice over the past 15 years have established Wnt signaling as a critical mechanism for stimulating osteoblast differentiation and activity. Importantly, recent studies have uncovered that Wnt signaling directly reprograms cellular metabolism by stimulating aerobic glycolysis, glutamine catabolism as well as fatty acid oxidation in osteoblast-lineage cells. Such findings therefore reveal an important regulatory axis between bone anabolic signals and cellular bioenergetics. A comprehensive understanding of osteoblast metabolism and its regulation is likely to reveal molecular targets for novel bone therapies.

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Acknowledgements

Original work in the Long lab was supported by NIH grants R01 AR060456 (FL) and F32 AR060674 (CMK).

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  1. Courtney M. Karner

    Present address: Department of Orthopaedic Surgery, Duke Orthopaedic, Cellular, Developmental and Genome Laboratories, Duke University School of Medicine, Durham, NC, 27710, USA

Authors and Affiliations

  1. Department of Orthopaedic Surgery, Washington University School of Medicine, St. Louis, MO, 63131, USA

    Courtney M. Karner & Fanxin Long

  2. Department of Cell Biology, Duke University School of Medicine, Durham, NC, 27710, USA

    Courtney M. Karner

  3. Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO, 63131, USA

    Fanxin Long

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Correspondence to Fanxin Long.

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Karner, C.M., Long, F. Wnt signaling and cellular metabolism in osteoblasts. Cell. Mol. Life Sci. 74, 1649–1657 (2017). https://doi.org/10.1007/s00018-016-2425-5

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  • DOI: https://doi.org/10.1007/s00018-016-2425-5

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