The development of vascular calcification is an active, highly regulated process with similarities to bone formation. Osteocalcin (OC), a vitamin K-dependent protein expressed by osteoblasts, contains 3 γ-carboxyglutamic acid residues derived from the vitamin K-dependent posttranslational modification of glutamic acid residues. Circulating undercarboxylated OC (ucOC) is increased in vitamin K deficiency and serum ucOC is reported to be a clinical marker of vitamin K status. Vitamin K deficiency is associated with vascular calcification as well as osteoporosis. We evaluated the relationship between ucOC and carotid artery calcification in 92 patients with essential hypertension. Ultrasound of the common carotid artery was performed to identify vascular calcification and subjects were divided into 2 groups: a calcification (+) group and a calcification (–) group. Serum creatinine and ucOC levels were higher in the calcification (+) group than in the calcification (–) group and serum ucOC correlated with serum creatinine. To identify the independent determinant factor for carotid artery calcification, we applied both ucOC and estimated glomerular filtration rate as independent factors in logistic regression analysis. Serum ucOC was an independent determinant of carotid calcification, suggesting that circulating ucOC may be an important biomarker of carotid artery calcification.
© 2010 S. Karger AG, Basel
- Carotid artery
- Vascular calcification
- Undercarboxylated osteocalcin
- Essential hypertension
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Takafumi Okura, MD, PhD
Department of Integrated Medicine and Informatics
Ehime University Graduate School of Medicine
Toon City 791-0295 (Japan)
Tel. +81 89 960 5302, Fax +81 89 960 5306, E-Mail email@example.com
Received: September 23, 2009
Accepted: January 19, 2010
Published online: March 2, 2010
Number of Print Pages : 6
Number of Figures : 1, Number of Tables : 3, Number of References : 36
Kidney and Blood Pressure Research
Vol. 33, No. 1, Year 2010 (Cover Date: March 2010)
Journal Editor: Tesar V. (Prague)
ISSN: 1420-4096 (Print), eISSN: 1423-0143 (Online)
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