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Area of Science:

  • Endocrinology
  • Bone Biology
  • Metabolic Research

Background:

  • Osteocalcin (OCN) is increasingly recognized for its systemic effects beyond bone structure.
  • The undercarboxylated form of OCN acts as a key osteokine, influencing various physiological processes.
  • Bone is now understood as an endocrine organ due to OCN's regulatory roles.

Purpose of the Study:

  • To review the inter-organ communication functions of osteocalcin.
  • To consolidate experimental evidence on OCN's systemic effects from animal models and human studies.
  • To explore OCN's potential as a therapeutic target for metabolic and reproductive disorders.

Main Methods:

  • Literature review of experimental data on osteocalcin.
  • Analysis of studies using animal models and human data.
  • Examination of OCN's interaction with its receptor GPRC6A.

Main Results:

  • Osteocalcin influences weight gain, insulin sensitivity, and glucose homeostasis.
  • OCN plays anabolic and metabolic roles in skeletal muscle.
  • Evidence suggests OCN impacts male fertility and central nervous system functions, potentially mitigating anxiety and depression.

Conclusions:

  • Osteocalcin is a crucial mediator of inter-organ communication, highlighting bone's endocrine function.
  • Experimental findings in animals are consistent with observations in humans.
  • Targeting OCN and its receptor GPRC6A offers potential therapeutic strategies for metabolic dysfunction and male infertility.