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Loss-of-function of SHARPIN causes an osteopenic phenotype in mice

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Abstract

SHARPIN is a novel protein thought to interact with SHANK family and is widely expressed in multiple tissues/cells, including osteoblasts and osteoclasts. Loss-of-function of Sharpin develops the chronic proliferative dermatitis mutation (CPDM) in mice as well as a severe inflammation in other organs. The actual function of SHARPIN is poorly understood. Our aim was to determine the functional roles of SHARPIN in bone metabolism by using CPDM mice. The skeletal phenotypes were determined by peripheral quantitative computed tomography, micro-computed tomography, and quantitative real-time RT-PCR, the cellular functions of osteoblasts and osteoclasts were investigated by ex vivo cell culture. Compared to wild-type controls, CPDM mice demonstrated significantly lower total and cortical bone mineral content and bone mineral density, trabecular and cortical bone volume, and trabecular number. The mRNA expression of Runx2, osterix, type I collagen, and osteocalcin was significantly lower in the bone from CPDM mice. Osteoclasts and osteoblasts from CPDM mice were functionally defective. Our result suggests that SHARPIN plays important regulating roles in bone metabolism. These functional roles may either come from systemic chronic inflammatory or directly signaling pathway within bone cells.

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Acknowledgment

This work was support by a grant to Dr. Xijie Yu from National Natural Science Foundation of China (No. 30872632).

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Authors and Affiliations

  1. Laboratory of Endocrinology and Metabolism, West China Hospital, Sichuan University, No. 37, Guoxue Xiang, 610041, Chengdu, People’s Republic of China

    Tian Xia, Junrong Ma, Mi Li & Xijie Yu

  2. Maine Institute for Human Genetics & Health, Bangor, ME, 04401, USA

    Meng Gong & Xijie Yu

  3. Department of Dermatology, Yale University School of Medicine, New Haven, CT, 06511, USA

    Yanhua Liang

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  1. Tian Xia
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  2. Yanhua Liang
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  3. Junrong Ma
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  4. Mi Li
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Correspondence to Xijie Yu.

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Tian Xia and Yanhua Liang contribute equally to this work.

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Xia, T., Liang, Y., Ma, J. et al. Loss-of-function of SHARPIN causes an osteopenic phenotype in mice. Endocr 39, 104–112 (2011). https://doi.org/10.1007/s12020-010-9418-1

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  • DOI: https://doi.org/10.1007/s12020-010-9418-1

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