In vivo radiometric analysis of glucose uptake and distribution in mouse bone

• Published in: Bone Research Vol. 4; no. 1; pp. 31 - 38
• Main Authors: Zoch, Meredith L, Abou, Diane S, Clemens, Thomas L, Thorek, Daniel L J, Riddle, Ryan C
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 05.04.2016; Springer Nature B.V; Department of 0rthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, USA%Division of Nuclear Medicine an Molecular Imaging, Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, USA; Nature Publishing Group
• Subjects: 631/443/319; 631/443/63; Internal Medicine; Medicine & Public Health; Orthopedics; 体内; 和分布; 小鼠; 摄取; 正电子发射断层扫描; 胰岛素受体; 脱氧葡萄糖; 计算机断层扫描
• ISSN: 2095-4700; 2095-6231
• DOI: 10.1038/boneres.2016.4

Bone formation and remodeling occurs throughout life and requires the sustained activity of osteoblasts and osteoclasts, particularly during periods of rapid bone growth. Despite increasing evidence linking bone cell activity to global energy homeostasis, little is known about the relative energy requirements or substrate utilization of bone cells. In these studies, we measured the uptake and distribution of glucose in the skeleton in vivo using positron-emitting 18F-fluorodeoxyglucose （[lSF]-FDG） and non-invasive, high-resolution positron emission tomography/computed tomography （PE~/CT） imaging and ex vivo autoradiography. Assessment of [~SF]-FDG uptake demonstrated that relative to other tissues bone accumulated a significant fraction of the total dose of the glucose analog..Skeletal accumulation was greatest in young mice undergoing the rapid bone formation that characterizes early development. PET/CT imaging revealed that [lSF]-FDG uptake was greatest in the epiphyseal and metaphyseal regions of long bones, which accords with the increased osteoblast numbers and activity at this skeletal site. Insulin administration significantly increased skeletal accumulation of [lSF]-FDG, while uptake was reduced in mice lacking the insulin receptor specifically in osteoblasts or fed a high-fat diet. Our results indicated that the skeleton is a site of significant glucose uptake and that its consumption by bone cells is subject to regulation by insulin and disturbances in whole-body metabolism.