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Vitamin K and bone
Maria Fusaro1,2, Maria Cristina Mereu3, Andrea Aghi4
1National Research Council (CNR), Institute of Clinical Physiology (IFC), Pisa, Italy.
Summary
Vitamin K, crucial for blood clotting, also plays a vital role in bone and vascular health. This review explores its protective effects against osteoporosis and vascular calcification.
Area of Science:
- Biochemistry
- Nutritional Science
- Molecular Biology
Background:
- Vitamin K is essential for blood coagulation by activating liver coagulation factors.
- Epidemiological studies link vitamin K deficiency to osteoporosis and vascular calcification.
- Vitamin K acts as a cofactor for gamma-glutamyl carboxylase (GGCX), carboxylating vitamin K-dependent proteins.
Purpose of the Study:
- To review the scientific literature on the protective role of Vitamin K in bone health.
- To evaluate the impact of Vitamin K on preventing vascular calcification.
Main Methods:
- Literature review of existing studies on Vitamin K.
- Analysis of Vitamin K's role as a GGCX co-enzyme.
- Investigation of Vitamin K as a ligand for the steroid and xenobiotic receptor (SXR/PXR).
Main Results:
- Vitamin K (Phylloquinone and Menaquinones) carboxylates key proteins like Osteocalcin and Matrix Gla Protein.
- Vitamin K is identified as a ligand for the SXR/PXR nuclear receptor in osteoblasts.
- Evidence suggests a protective role for Vitamin K in bone metabolism and vascular health.
Conclusions:
- Vitamin K is critical for maintaining bone and vascular health beyond its role in coagulation.
- Further research into Vitamin K's mechanisms, including SXR/PXR interaction, is warranted.
- Adequate Vitamin K intake may be beneficial for preventing osteoporosis and vascular calcification.
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