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Journal of Korean medical science : JKMS v.25 no.7 = no.140, 2010년, pp.985 - 991   SCI SCIE SCOPUS
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Integrative Physiology: Defined Novel Metabolic Roles of Osteocalcin

Kim, Yu-Sik    (Laboratory of Exercise Physiology and Medicine, Department of Physical Education, Yonsei University, Seoul, Korea.   ); Paik, Il-Young    (Laboratory of Exercise Physiology and Medicine, Department of Physical Education, Yonsei University, Seoul, Korea.   ); Rhie, Young-Jun    (Department of Pediatrics, Korea University of College of Medicine, Seoul, Korea.   ); Suh, Sang-Hoon    (Laboratory of Exercise Physiology and Medicine, Department of Physical Education, Yonsei University, Seoul, Korea.  );
  • 초록

    The prevailing model of osteology is that bones constantly undergo a remodeling process, and that the differentiation and functions of osteoblasts are partially regulated by leptin through different central hypothalamic pathways. The finding that bone remodeling is regulated by leptin suggested possible endocrinal effects of bones on energy metabolism. Recently, a reciprocal relationship between bones and energy metabolism was determined whereby leptin influences osteoblast functions and, in turn, the osteoblast-derived protein osteocalcin influences energy metabolism. The metabolic effects of bones are caused by the release of osteocalcin into the circulation in an uncarboxylated form due to incomplete γ-carboxylation. In this regard, the Esp gene encoding osteotesticular protein tyrosine phosphatase is particularly interesting because it may regulate γ-carboxylation of osteocalcin. Novel metabolic roles of osteocalcin have been identified, including increased insulin secretion and sensitivity, increased energy expenditure, fat mass reduction, and mitochondrial proliferation and functional enhancement. To date, only a positive correlation between osteocalcin and energy metabolism in humans has been detected, leaving causal effects unresolved. Further research topics include: identification of the osteocalcin receptor; the nature of osteocalcin regulation in other pathways regulating metabolism; crosstalk between nutrition, osteocalcin, and energy metabolism; and potential applications in the treatment of metabolic diseases.


  • 주제어

    Osteocalcin .   Energy Metabolism .   Bone Remodeling .   Leptin .   Protein Tyrosine Phosphatases.  

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