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Background: The interplay between vitamin K (vitK) (as carboxylation cofactor, partially produced by the gut microbiota) and short-chain fatty acids (SCFAs), the end-product of fiber fermentation in the gut, has never been assessed in mother–newborn pairs, although newborns are considered vitK deficient and with sterile gut. Methods: We collected venous blood from 45 healthy mothers with uncomplicated term pregnancies and umbilical cord blood from their newborns at birth. The concentrations of total SCFAs and hepatic/extra-hepatic vitK-dependent proteins (VKDPs), as proxies of vitK status were assayed: undercarboxylated and total matrix Gla protein (ucMGP and tMGP), undercarboxylated osteocalcin (ucOC), undercarboxylated Gla-rich protein (ucGRP), and protein induced by vitK absence II (PIVKA-II). Results: We found significantly higher ucOC (18.6-fold), ucMGP (9.2-fold), and PIVKA-II (5.6-fold) levels in newborns, while tMGP (5.1-fold) and SCFAs (2.4-fold) were higher in mothers, and ucGRP was insignificantly modified. In mother–newborn pairs, only ucGRP (r = 0.746, p < 0.01) and SCFAs (r = 0.428, p = 0.01) levels were correlated. Conclusions: We report for the first time the presence of SCFAs in humans at birth, probably transferred through the placenta to the fetus. The increased circulating undercarboxylated VKDPSs in newborns revealed a higher vitamin K deficiency at the extrahepatic level compared to liver VKDPs. [ABSTRACT FROM AUTHOR]

Background: The interplay between vitamin K (vitK) (as carboxylation cofactor, partially produced by the gut microbiota) and short-chain fatty acids (SCFAs), the end-product of fiber fermentation in the gut, has never been assessed in mother–newborn pairs, although newborns are considered vitK deficient and with sterile gut. Methods: We collected venous blood from 45 healthy mothers with uncomplicated term pregnancies and umbilical cord blood from their newborns at birth. The concentrations of total SCFAs and hepatic/extra-hepatic vitK-dependent proteins (VKDPs), as proxies of vitK status were assayed: undercarboxylated and total matrix Gla protein (ucMGP and tMGP), undercarboxylated osteocalcin (ucOC), undercarboxylated Gla-rich protein (ucGRP), and protein induced by vitK absence II (PIVKA-II). Results: We found significantly higher ucOC (18.6-fold), ucMGP (9.2-fold), and PIVKA-II (5.6-fold) levels in newborns, while tMGP (5.1-fold) and SCFAs (2.4-fold) were higher in mothers, and ucGRP was insignificantly modified. In mother–newborn pairs, only ucGRP (r = 0.746, p < 0.01) and SCFAs (r = 0.428, p = 0.01) levels were correlated. Conclusions: We report for the first time the presence of SCFAs in humans at birth, probably transferred through the placenta to the fetus. The increased circulating undercarboxylated VKDPSs in newborns revealed a higher vitamin K deficiency at the extrahepatic level compared to liver VKDPs.

Introduction: Vitamin K, discovered in the 1930s, is a very important compound for the human body, performing many func- tions. The most well known of them are calcium homeostasis and coagulation. Nowadays it is apparent that many more beneficial multiorgan aspects of vitamin K exist. The aim of the study was to review the properties of vitamin K and to show its potential therapeutic value. Materials and methods: Medline databases (PubMed) and other scientific sources were searched. Results: Vitamin K shows a multifaceted effect on the proper functioning of the human body: preventing coronary vessel calcification, maintains normal blood pressure, has neuroprotective effects, reduces the risk of myocardial infarction, slows the process of osteoclastogenesis, and influences the production of bone reabsorption factors. In addition, vitamin K supplementation has been shown to reduce the risk of hepatocellular carcinoma (HCC) by interfering with tumour cells cycle and inducing their apoptosis. The pro-apoptotic activity of menaquinone is not limited to HCC only, but also to other cancers such as glioblastoma multi-forme, breast cancer or bladder cancer, which reveals the importance of vitamin K in oncology. Possibly, introduction of vitamin K to the therapy may improve malignancy treatment outcomes. Conclusions: Vitamin K derivatives participate in many meta- bolic pathways of the human body. Their multifaceted activity may be used both in prevention of many diseases and in their potential treatments. However, further multicentre studies are necessary to understand better possible therapeutic properties of vitamin K derivatives. [ABSTRACT FROM AUTHOR]