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THE NEW FACE OF VITAMIN K - MORE THAN BLOOD CLOTTING FACTOR

D. Ivanov, M. Bliznakova, K. Petrova, N. Petkova, B. Galunska

Abstract

Introduction: Twenty years ago, the metabolism of vitamin K was connected with its role in hemostasis. Since that time, it has been shown that vitamin K exerts multiple functions mediated by the Gla-proteins, having vitamin K as a cofactor. Numerous publications affirm that these Gla-proteins are related to physiological processes beyond coagulations, such as bone metabolism, vascular health and energy homeostasis.

Aim: The aim of this research is to provide new data for the role of vitamin K in a myriad of physiological processes beyond blood clotting. Additionally, it aims to assess the potential new applications of vitamin K as a supplement for the prevention of bone and vascular diseases.

Materials and Methods: Using the online databases Scopus, PubMed and Google Scholar, a search with the keywords: “vitamin K2”, “bone metabolism”, “cardiovascular diseases”, “osteocalcin” and “MGP” was conducted. Information regarding the effects of vitamin K on bone and vascular health was referred to in this work.

Results: Vitamin K and vitamin K-dependent proteins play pivotal roles in the physiology of bone mineralization and in preventing ectopic calcification. Osteocalcin, a Gla protein located in bone and dentin, is important for bone mineralization. Following the posttranslational carboxylation of Glu-residues with a cofactor vitamin K2 (menaquinone), rather than vitamin K1 (phylloquinone), osteocalcin shows increased affinity for calcium. Osteocalcin is believed to be involved in osteoblast regulation and hydroxyapatite crystal growth. Matrix GLa-protein (MGP), sharing some sequences with osteocalcin, is a local inhibitor of arterial calcification. Vitamin K deficiency impairs the function of osteocalcin and MGP and, therefore, presumably contributes to bone demineralization and vascular calcification, the so-called calcium paradox.

Conclusions: Vitamin K deficiencies, traditionally regarded as a cause for internal hemorrhages and blood clotting disorders, apparently can be linked to cardiovascular calcification and abnormal bone modelling. Appropriate treatment of vitamin K deficiency may improve bone and arterial health.





DOI: http://dx.doi.org/10.14748/ssp.v4i1.3957

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About The Authors

D. Ivanov

M. Bliznakova

K. Petrova

N. Petkova

B. Galunska

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