Detailed Explanation
49-amino-acid peptide hormone secreted by osteoblasts (bone-forming cells) during bone formation. Contains three γ-carboxyglutamic acid (Gla) residues that require vitamin K for synthesis and bind calcium ions, anchoring osteocalcin to the hydroxyapatite mineral matrix of bone.
Traditionally considered just a bone protein, Gerard Karsenty's research revealed that undercarboxylated osteocalcin released during bone resorption acts as a hormone affecting distant organs: it improves insulin sensitivity in adipose tissue, enhances testosterone production in testes, promotes memory and exercise capacity in the brain, and increases muscle function. This established bone as an endocrine organ and osteocalcin as a hormone linking bone metabolism to whole-body physiology.
Key Facts
- 49-amino-acid peptide hormone secreted by osteoblasts (bone-forming cells) during bone formation.
- Contains three γ-carboxyglutamic acid (Gla) residues that require vitamin K for synthesis and bind calcium ions, anchoring osteocalcin to the hydroxyapatite mineral matrix of bone.
- Traditionally considered just a bone protein, Gerard Karsenty's research revealed that undercarboxylated osteocalcin released during bone resorption acts as a hormone affecting distant organs: it improves insulin sensitivity in adipose tissue, enhances testosterone production in testes, promotes memory and exercise capacity in the brain, and increases muscle function.
- This established bone as an endocrine organ and osteocalcin as a hormone linking bone metabolism to whole-body physiology.
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