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Huang W, Li J, Zhu Q, Lv J, Zhu R, Pu C, Zhao H, Fu G, Zhang D. Increasing Vitamin K 2 Synthesis in Bacillus subtilis by Controlling the Expression of MenD and Stabilizing MenA. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024. [PMID: 39373655 DOI: 10.1021/acs.jafc.4c07385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/08/2024]
Abstract
As an indispensable member of the family of lipid vitamins, vitamin K2 (MK-7) plays an important role in blood coagulation, cardiovascular health, and kidney health. Microbial fermentation is favored due to its high utilization rate of raw materials, simple operation, and moderate conditions. However, the biosynthesis pathway of vitamin K2 in microorganisms is highly complex, which hinders its industrial production in microbial cell factories. One of the major challenges is the stable expression and deregulation of key enzymes in the vitamin K2 biosynthesis pathway, which remains unclear and has undergone little investigation. In this study, 2-succinyl-5-enolpyruvyl-6-hydroxy-3-cyclohexene-1-carboxylic-acid synthase (MenD) and 1,4-dihydroxy-2-naphthoate polyprenyltransferase (MenA) were identified as pivotal enzymes in the biosynthesis of vitamin K2. To investigate the catalytic efficiency of MenD in the biosynthesis pathway of vitamin K2, structure-based mutation design and site-directed mutagenesis were performed. Three mutation sites were identified in MenD: A115Y, R96 M, and R323M, which improve the expression level and protein stability. Meanwhile, the MenA mutant T290M, which exhibits improved protein stability, was obtained by modifying its hydrophobic stacking structure. Finally, an engineered strain noted ZQ13 that combinatorially overexpressed MenD (A115Y) and MenA (T290M) mutants was constructed and achieved 338.37 mg/L vitamin K2 production in a 3-L fermenter.
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Affiliation(s)
- Wei Huang
- School of Biological Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
| | - Jinlong Li
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qiyao Zhu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
| | - Jianan Lv
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
| | - Rui Zhu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
| | - Chunxiang Pu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
| | - Huabing Zhao
- School of Biological Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Gang Fu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
| | - Dawei Zhang
- School of Biological Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
- University of Chinese Academy of Sciences, Beijing 100049, China
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Barna M, Dunovska K, Cepova J, Werle J, Prusa R, Bjørklud G, Melichercik P, Kizek R, Klapkova E. Short-term impact of vitamin K2 supplementation on biochemical parameters and lipoprotein fractions. Electrophoresis 2024. [PMID: 39091191 DOI: 10.1002/elps.202400058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2024] [Revised: 06/29/2024] [Accepted: 07/14/2024] [Indexed: 08/04/2024]
Abstract
This study explored the short-term effects of vitamin K2 (VK2) supplementation on biochemical parameters (vitamin D, vitamin E, vitamin A, alkaline phosphatase, calcium, phosphorus (P), magnesium, metallothionein, triglycerides, cholesterol, high-density lipoprotein (HDL), low-density lipoprotein (LDL), and lipoprotein fractions (albumin, HDL, very low-density lipoprotein (VLDL), LDL, and chylomicrons). A short-term experiment (24 h, six probands) was performed to track changes in VK2 levels after a single-dose intake (360 µg/day). Liquid chromatography-tandem mass spectrometry was used to monitor vitamin K levels (menaquinone-4 (MK-4), menaquinone-7 (MK-7), and vitamin K1 [VK1]) with a limit of detection of 1.9 pg/mL for VK1 and 3.8 pg/mL for the two forms of VK2. Results showed that MK-7 levels significantly increased within 2-6 h post-administration and then gradually declined. MK-4 levels were initially low, showing a slight increase, whereas VK1 levels rose initially and then decreased. Biochemical analyses indicated no significant changes in sodium, chloride, potassium, calcium, magnesium, albumin, or total protein levels. A transient increase in P was observed, peaking at 12 h before returning to baseline. Agarose gel electrophoresis of lipoprotein fractions revealed distinct chylomicron bands and variations in VLDL and HDL mobility, influenced by dietary lipids and VK2 supplementation. These findings suggest effective absorption and metabolism of MK-7 with potential implications for bone metabolism and cardiovascular health.
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Affiliation(s)
- Milos Barna
- Department of Medical Chemistry and Clinical Biochemistry, Second Faculty of Medicine, Charles University in Prague, Motol University Hospital, Prague, Czechia
- First Department of Orthopaedics, First Faculty of Medicine, Charles University in Prague, Motol University Hospital, Prague, Czechia
| | - Katerina Dunovska
- Department of Medical Chemistry and Clinical Biochemistry, Second Faculty of Medicine, Charles University in Prague, Motol University Hospital, Prague, Czechia
| | - Jana Cepova
- Department of Medical Chemistry and Clinical Biochemistry, Second Faculty of Medicine, Charles University in Prague, Motol University Hospital, Prague, Czechia
| | - Julia Werle
- Department of Medical Chemistry and Clinical Biochemistry, Second Faculty of Medicine, Charles University in Prague, Motol University Hospital, Prague, Czechia
| | - Richard Prusa
- Department of Medical Chemistry and Clinical Biochemistry, Second Faculty of Medicine, Charles University in Prague, Motol University Hospital, Prague, Czechia
| | - Geir Bjørklud
- Council for Nutritional and Environmental Medicine, Mo i Rana, Norway
| | - Pavel Melichercik
- First Department of Orthopaedics, First Faculty of Medicine, Charles University in Prague, Motol University Hospital, Prague, Czechia
| | - Rene Kizek
- Department of Medical Chemistry and Clinical Biochemistry, Second Faculty of Medicine, Charles University in Prague, Motol University Hospital, Prague, Czechia
| | - Eva Klapkova
- Department of Medical Chemistry and Clinical Biochemistry, Second Faculty of Medicine, Charles University in Prague, Motol University Hospital, Prague, Czechia
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Merra G, Dominici F, Gualtieri P, Capacci A, Cenname G, Esposito E, Dri M, Di Renzo L, Marchetti M. Role of vitamin K2 in bone-vascular crosstalk. INT J VITAM NUTR RES 2024; 94:143-152. [PMID: 36039403 DOI: 10.1024/0300-9831/a000761] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Vitamin K (VK) is a fat-soluble vitamin that is indispensable for the activation of vitamin K-dependent proteins (VKDPs). It has been shown to play an important role in the proper calcium deposit at the bone level, hindering that on the vascular walls. The deficiency of this vitamin in European populations is frequent and unknown. It is related to several factors, poor dietary intake, altered intestinal absorption or altered production by bacteria, indicating possible dysbiosis. For Vitamin K2 (VK2), there is currently no official reference daily intake (RDI). However, the effects of VK2 on the improvement of health in cardiovascular diseases, on bone metabolism, on chronic kidney diseases have been the subject of research in recent decades. The microbiota in the gastrointestinal tract plays an important role: Bacteroides are primarily capable of synthetizing very long chain forms of menaquinones and, in addition to the bacteria present in the intestinal flora, VK2 is also produced by bacteria used in food fermentation processes. This review provides an update on the current literature regarding the origin of VK2 and its implications in what is called the "calcium paradox", namely the lack of calcium in the bone and its storage in the wall of the vessel.
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Affiliation(s)
- Giuseppe Merra
- Section of Clinical Nutrition and Nutrigenomic, Department of Biomedicine and Prevention, University of Rome Tor Vergata, Rome, Italy
| | - Francesca Dominici
- Section of Clinical Nutrition and Nutrigenomic, Department of Biomedicine and Prevention, University of Rome Tor Vergata, Rome, Italy
| | - Paola Gualtieri
- Section of Clinical Nutrition and Nutrigenomic, Department of Biomedicine and Prevention, University of Rome Tor Vergata, Rome, Italy
| | - Annunziata Capacci
- Department of Medical and Surgical Sciences, Agostino Gemelli General Hospital Foundation-IRCCS, Rome, Italy
| | - Giuseppe Cenname
- Comando Generale Arma Carabinieri, Direzione di Sanità, Rome, Italy
| | - Ernesto Esposito
- General Directorate, Department of Human Policies of Basilicata Region, Potenza, Italy
| | - Maria Dri
- Department of Surgical Sciences, School of Applied Medical-Surgical Sciences, University of Rome Tor Vergata, Rome, Italy
| | - Laura Di Renzo
- Section of Clinical Nutrition and Nutrigenomic, Department of Biomedicine and Prevention, University of Rome Tor Vergata, Rome, Italy
| | - Marco Marchetti
- Section of Clinical Nutrition and Nutrigenomic, Department of Biomedicine and Prevention, University of Rome Tor Vergata, Rome, Italy
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Chatron N, Boulven M, Montagut-Romans A, Ponsot F, Jacolot M, Caruel H, Benoît E, Popowycz F, Lattard V. Design of a structure-activity relationship model of vitamin K epoxide reductase (VKORC1) inhibitors combining chemical synthesis of new compounds, enzymatic assays and molecular modelling. Bioorg Med Chem 2023; 94:117453. [PMID: 37741121 DOI: 10.1016/j.bmc.2023.117453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 08/13/2023] [Accepted: 08/21/2023] [Indexed: 09/25/2023]
Abstract
Vitamin K antagonists (VKAs) anticoagulants have been used since the 1950s as medicines and rodenticides. These molecules are mainly 4-hydroxycoumarin derivatives and act by inhibiting the vitamin K epoxide reductase (VKORC1), an endoplasmic reticulum membrane resident enzyme. However, many VKORC1 mutations have been reported over the last decade, inducing VKAs resistances and thus treatments failures. Although studies have reported experimental and computational investigations of VKAs based on VKORC1 structural homology models, the development of new effective anticoagulants has been quite complex due to the lack of structural data and reliable structure-activity relationships. However, the recent publication of VKORC1 crystal structure provides new information for further studies. Based on these findings, we combined chemical synthesis, enzymatic assays and molecular modelling methods to design a structure-activity relationship (SAR) model. Our results proved that the lipophilicity, the membrane permeability of inhibitors and their affinity towards human VKORC1 enzyme are the main characteristics for potent anticoagulants. Our SAR model managed to rank compounds according to their ability to inhibit the human VKORC1. Such a tool might constitute an alternative to evaluate new molecules potency before their chemical synthesis and biological assessment and might assist the development of new VKAs.
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Affiliation(s)
- Nolan Chatron
- USC 1233 RS2GP, VetAgro Sup, INRAE, University of Lyon, 69280 Marcy L'Etoile, France.
| | - Manon Boulven
- Univ Lyon, INSA Lyon, Université Lyon 1, CNRS, CPE Lyon, UMR 5246, ICBMS, 1 rue Victor Grignard, 69621 Villeurbanne Cedex, France; Liphatech, Bonnel, 47480 Pont-du-Casse, France
| | - Adrien Montagut-Romans
- Univ Lyon, INSA Lyon, Université Lyon 1, CNRS, CPE Lyon, UMR 5246, ICBMS, 1 rue Victor Grignard, 69621 Villeurbanne Cedex, France; Liphatech, Bonnel, 47480 Pont-du-Casse, France
| | - Flavien Ponsot
- Univ Lyon, INSA Lyon, Université Lyon 1, CNRS, CPE Lyon, UMR 5246, ICBMS, 1 rue Victor Grignard, 69621 Villeurbanne Cedex, France
| | - Maïwenn Jacolot
- Univ Lyon, INSA Lyon, Université Lyon 1, CNRS, CPE Lyon, UMR 5246, ICBMS, 1 rue Victor Grignard, 69621 Villeurbanne Cedex, France
| | | | - Etienne Benoît
- USC 1233 RS2GP, VetAgro Sup, INRAE, University of Lyon, 69280 Marcy L'Etoile, France
| | - Florence Popowycz
- Univ Lyon, INSA Lyon, Université Lyon 1, CNRS, CPE Lyon, UMR 5246, ICBMS, 1 rue Victor Grignard, 69621 Villeurbanne Cedex, France
| | - Virginie Lattard
- USC 1233 RS2GP, VetAgro Sup, INRAE, University of Lyon, 69280 Marcy L'Etoile, France
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Yuan Y, Szeto IMY, Li N, Yang H, Zhou Y, Liu B, He F, Zhang L, Duan S, Chen J. Effects of Menaquinone-7 on the Bone Health of Growing Rats under Calcium Restriction: New Insights from Microbiome-Metabolomics. Nutrients 2023; 15:3398. [PMID: 37571336 PMCID: PMC10421271 DOI: 10.3390/nu15153398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Revised: 07/24/2023] [Accepted: 07/25/2023] [Indexed: 08/13/2023] Open
Abstract
Insufficient calcium intake during growth is a global public health concern. The aim of this study was to investigate the effects of dietary menaquinone-7 (MK-7) on bone accrual in growing Sprague-Dawley rats under calcium restriction. Following 13 weeks of treatment, various bone quality parameters, including microarchitecture, were measured. Fecal and cecal samples were subjected to microbiome (16S rRNA gene sequencing) analyses, while metabolomics analysis of the cecum and humerus samples was analyzed based on UHPLC-Q/TOF-MS. We found that calcium deficiency diminished the richness of the microbiome and disrupted microbiome composition, accompanied by an elevation in the relative abundance of Parasutterella. Furthermore, calcium insufficiency escalated the level of isovaleric acid and modified the metabolic profiles. MK-7 supplementation significantly increased the cortical thickness, cortical bone area, and the calcium content of the femur. Apart from improving bone calcium deposition and diminishing bone resorption, the mechanisms underlying the beneficial effects of MK on bone quality also involve the modulation of the host's metabolic pathways and the composition of gut microbiota. The gut-bone axis holds promise as an efficacious target for ameliorating calcium deficiency in children's bone quality, and MK-7 is a promising dietary supplement from this perspective.
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Affiliation(s)
- Ya Yuan
- Department of Nutrition and Food Safety, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu 610041, China; (Y.Y.); (N.L.); (Y.Z.); (F.H.); (L.Z.)
- School of Laboratory Medicine, Chengdu Medical College, Chengdu 610500, China
- Food Safety Monitoring and Risk Assessment Key Laboratory of Sichuan Province, Chengdu 610041, China
| | - Ignatius Man-Yau Szeto
- Yili Maternal and Infant Nutrition Institute (YMINI), Inner Mongolia Yili Industrial Group, Co., Ltd., Beijing 100071, China; (I.M.-Y.S.); (B.L.)
- Inner Mongolia Dairy Technology Research Institute Co., Ltd., Hohhot 010110, China
- National Center of Technology Innovation for Dairy, Hohhot 013757, China
| | - Na Li
- Department of Nutrition and Food Safety, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu 610041, China; (Y.Y.); (N.L.); (Y.Z.); (F.H.); (L.Z.)
- Department of Nutrition, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Hua Yang
- The Analysis and Assay Center of Sichuan University West China School of Public Health, Sichuan University, Chengdu 610093, China;
| | - Yunzheng Zhou
- Department of Nutrition and Food Safety, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu 610041, China; (Y.Y.); (N.L.); (Y.Z.); (F.H.); (L.Z.)
- Food Safety Monitoring and Risk Assessment Key Laboratory of Sichuan Province, Chengdu 610041, China
| | - Biao Liu
- Yili Maternal and Infant Nutrition Institute (YMINI), Inner Mongolia Yili Industrial Group, Co., Ltd., Beijing 100071, China; (I.M.-Y.S.); (B.L.)
- Inner Mongolia Dairy Technology Research Institute Co., Ltd., Hohhot 010110, China
| | - Fang He
- Department of Nutrition and Food Safety, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu 610041, China; (Y.Y.); (N.L.); (Y.Z.); (F.H.); (L.Z.)
- Food Safety Monitoring and Risk Assessment Key Laboratory of Sichuan Province, Chengdu 610041, China
| | - Lishi Zhang
- Department of Nutrition and Food Safety, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu 610041, China; (Y.Y.); (N.L.); (Y.Z.); (F.H.); (L.Z.)
- Food Safety Monitoring and Risk Assessment Key Laboratory of Sichuan Province, Chengdu 610041, China
| | - Sufang Duan
- Yili Maternal and Infant Nutrition Institute (YMINI), Inner Mongolia Yili Industrial Group, Co., Ltd., Beijing 100071, China; (I.M.-Y.S.); (B.L.)
- Inner Mongolia Dairy Technology Research Institute Co., Ltd., Hohhot 010110, China
- National Center of Technology Innovation for Dairy, Hohhot 013757, China
| | - Jinyao Chen
- Department of Nutrition and Food Safety, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu 610041, China; (Y.Y.); (N.L.); (Y.Z.); (F.H.); (L.Z.)
- Food Safety Monitoring and Risk Assessment Key Laboratory of Sichuan Province, Chengdu 610041, China
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Clarke P, Shearer MJ, Card DJ, Nichols A, Ponnusamy V, Mahaveer A, Voong K, Dockery K, Holland N, Mulla S, Hall LJ, Maassen C, Lux P, Schurgers LJ, Harrington DJ. Exclusively breastmilk-fed preterm infants are at high risk of developing subclinical vitamin K deficiency despite intramuscular prophylaxis at birth. J Thromb Haemost 2022; 20:2773-2785. [PMID: 36087073 PMCID: PMC9828794 DOI: 10.1111/jth.15874] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2022] [Revised: 07/25/2022] [Accepted: 08/25/2022] [Indexed: 01/13/2023]
Abstract
BACKGROUND There is near-global consensus that all newborns be given parenteral vitamin K1 (VK1 ) at birth as prophylaxis against VK deficiency bleeding (VKDB). Breastmilk has a low VK content and cases of late VKDB are reported in exclusively breastmilk-fed preterm infants despite VK prophylaxis at birth. OBJECTIVES To assess the prevalence of functional VK insufficiency in preterm infants based on elevated under-γ-carboxylated (Glu) species of Gla proteins, factor II (PIVKA-II), and osteocalcin (GluOC), synthesized by liver and bone, respectively. PATIENTS/METHODS Prospective, multicenter, observational study in preterm infants born <33 weeks' gestation. Blood samples and dietary history were collected before hospital discharge, and after discharge at 2-3 months' corrected age. Outcome measures were serum VK1 , PIVKA-II, and %GluOC (GluOC as a percentage of the sum of GluOC plus GlaOC) compared between exclusively breastmilk-fed and formula/mixed-fed infants after discharge. RESULTS After discharge, breastmilk-fed babies had significantly lower serum VK1 (0.15 vs. 1.81 μg/L), higher PIVKA-II (0.10 vs. 0.02 AU/ml) and higher %GluOC (63.6% vs. 8.1%) than those receiving a formula/mixed-feed diet. Pre-discharge (based on elevated PIVKA-II), only one (2%) of 45 breastmilk-fed infants was VK insufficient. After discharge, eight (67%) of 12 exclusively breastmilk-fed babies were VK insufficient versus only one (4%) of 25 formula/mixed-fed babies. CONCLUSIONS Preterm infants who remain exclusively or predominantly human breastmilk-fed after neonatal unit discharge are at high risk of developing subclinical VK deficiency in early infancy. Routine postdischarge VK1 supplementation of breastfed infants to provide intakes comparable to those from formula milks should prevent this deficiency.
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Affiliation(s)
- Paul Clarke
- Neonatal Intensive Care UnitNorfolk and Norwich University Hospitals NHS Foundation TrustNorwichUK
- Norwich Medical SchoolUniversity of East AngliaNorwichUK
| | - Martin J. Shearer
- Centre for Haemostasis and ThrombosisGuy's and St Thomas's NHS Foundation TrustLondonUK
| | - David J. Card
- Nutristasis Unit, Viapath, Guy's and St Thomas's NHS Foundation TrustLondonUK
| | - Amy Nichols
- Neonatal Intensive Care UnitNorfolk and Norwich University Hospitals NHS Foundation TrustNorwichUK
| | - Vennila Ponnusamy
- Neonatal Intensive Care UnitAshford and St Peter's Hospitals NHS Foundation TrustChertseyUK
| | - Ajit Mahaveer
- Neonatal Intensive Care Unit, St Mary's HospitalManchester University NHS Foundation TrustManchesterUK
| | - Kieran Voong
- Centre for Haemostasis and ThrombosisGuy's and St Thomas's NHS Foundation TrustLondonUK
| | - Karen Dockery
- Neonatal Intensive Care Unit, St Mary's HospitalManchester University NHS Foundation TrustManchesterUK
| | - Nicky Holland
- Neonatal Intensive Care UnitAshford and St Peter's Hospitals NHS Foundation TrustChertseyUK
| | - Shaveta Mulla
- Neonatal Intensive Care UnitNorfolk and Norwich University Hospitals NHS Foundation TrustNorwichUK
| | - Lindsay J. Hall
- Gut Microbes & HealthQuadram Institute BioscienceNorwichUK
- ZIEL – Institute for Food & HealthTechnical University of MunichFreisingGermany
| | - Cecile Maassen
- Department of BiochemistryCardiovascular Research Institute MaastrichtMaastricht UniversityMaastrichtThe Netherlands
| | - Petra Lux
- Department of BiochemistryCardiovascular Research Institute MaastrichtMaastricht UniversityMaastrichtThe Netherlands
| | - Leon J. Schurgers
- Department of BiochemistryCardiovascular Research Institute MaastrichtMaastricht UniversityMaastrichtThe Netherlands
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杜 长, 李 娜. [Serum vitamin K 2 level and its association with bone metabolism markers in 1 732 children]. ZHONGGUO DANG DAI ER KE ZA ZHI = CHINESE JOURNAL OF CONTEMPORARY PEDIATRICS 2022; 24:1130-1135. [PMID: 36305114 PMCID: PMC9628004 DOI: 10.7499/j.issn.1008-8830.2205090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 08/30/2022] [Indexed: 01/25/2023]
Abstract
OBJECTIVES To study the level of serum vitamin K2 (VitK2) and its association with bone metabolism markers osteocalcin (OC), type I procollagen amino-terminal peptide (PINP), and type I collagen carboxy-terminal peptide (CTX) in children. METHODS A prospective analysis was performed on 1 732 children who underwent routine physical examination from October 2020 to October 2021. The serum levels of VitK2 and 25-hydroxy vitamin D [25(OH)D] were measured. According to age, they were divided into four groups: <1 year, 1-3 years group, >3-6 years group, and >6-14 years. A total of 309 children with 25(OH)D≥50 nmol/L were screened out, and serum levels of OC, PINP, and CTX were measured to investigate the correlation of the serum levels of OC, PINP, and CTX with serum VitK2 levels in different age groups. RESULTS The prevalence rate of serum VitK2 deficiency was 52.31% (906/1 732). The VitK2 deficiency group had higher prevalence rates of overweight/obesity and growth pain (≥3 years of age) than the normal VitK2 group (P<0.05). There were differences in the prevalence rate of serum VitK2 deficiency (P<0.0083) and the serum level of VitK2 (P<0.05) between the 1-3 years group and the >6-14 years group. The <1 year group had a higher serum level of CTX and a lower serum level of PINP than the >3-6 years group and the >6-14 years group (P<0.05). The <1 year group had a lower serum level of OC than the >6-14 years group (P<0.05). Serum VitK2 level was positively correlated with OC level (rs=0.347, P<0.01), and CTX level was negatively correlated with PINP level (rs=-0.317, P<0.01). CONCLUSIONS Serum VitK2 deficiency may be associated with overweight/obesity. Serum VitK2 may affect the level of OC and even bone health.
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Jadhav N, Ajgaonkar S, Saha P, Gurav P, Pandey A, Basudkar V, Gada Y, Panda S, Jadhav S, Mehta D, Nair S. Molecular Pathways and Roles for Vitamin K2-7 as a Health-Beneficial Nutraceutical: Challenges and Opportunities. Front Pharmacol 2022; 13:896920. [PMID: 35774605 PMCID: PMC9237441 DOI: 10.3389/fphar.2022.896920] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Accepted: 05/12/2022] [Indexed: 11/15/2022] Open
Abstract
Vitamin K2-7, also known as menaquinone-7 (MK-7) is a form of vitamin K that has health-beneficial effects in osteoporosis, cardiovascular disease, inflammation, cancer, Alzheimer's disease, diabetes and peripheral neuropathy. Compared to vitamin K1 (phylloquinone), K2-7 is absorbed more readily and is more bioavailable. Clinical studies have unequivocally demonstrated the utility of vitamin K2-7 supplementation in ameliorating peripheral neuropathy, reducing bone fracture risk and improving cardiovascular health. We examine how undercarboxylated osteocalcin (ucOC) and matrix Gla protein (ucMGP) are converted to carboxylated forms (cOC and cMGP respectively) by K2-7 acting as a cofactor, thus facilitating the deposition of calcium in bones and preventing vascular calcification. K2-7 is beneficial in managing bone loss because it upregulates osteoprotegerin which is a decoy receptor for RANK ligand (RANKL) thus inhibiting bone resorption. We also review the evidence for the health-beneficial outcomes of K2-7 in diabetes, peripheral neuropathy and Alzheimer's disease. In addition, we discuss the K2-7-mediated suppression of growth in cancer cells via cell-cycle arrest, autophagy and apoptosis. The mechanistic basis for the disease-modulating effects of K2-7 is mediated through various signal transduction pathways such as PI3K/AKT, MAP Kinase, JAK/STAT, NF-κB, etc. Interestingly, K2-7 is also responsible for suppression of proinflammatory mediators such as IL-1α, IL-1β and TNF-α. We elucidate various genes modulated by K2-7 as well as the clinical pharmacometrics of vitamin K2-7 including K2-7-mediated pharmacokinetics/pharmacodynamics (PK/PD). Further, we discuss the current status of clinical trials on K2-7 that shed light on dosing strategies for maximum health benefits. Taken together, this is a synthetic review that delineates the health-beneficial effects of K2-7 in a clinical setting, highlights the molecular basis for these effects, elucidates the clinical pharmacokinetics of K2-7, and underscores the need for K2-7 supplementation in the global diet.
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Affiliation(s)
| | | | | | | | | | | | - Yash Gada
- Viridis Biopharma Pvt. Ltd., Mumbai, India
| | | | | | - Dilip Mehta
- Synergia Life Sciences Pvt. Ltd., Mumbai, India
| | - Sujit Nair
- Viridis Biopharma Pvt. Ltd., Mumbai, India
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9
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Bus K, Szterk A. Relationship between Structure and Biological Activity of Various Vitamin K Forms. Foods 2021; 10:foods10123136. [PMID: 34945687 PMCID: PMC8701896 DOI: 10.3390/foods10123136] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 12/14/2021] [Accepted: 12/16/2021] [Indexed: 01/06/2023] Open
Abstract
Vitamin K is involved many biological processes, such as the regulation of blood coagulation, prevention of vascular calcification, bone metabolism and modulation of cell proliferation. Menaquinones (MK) and phylloquinone vary in biological activity, showing different bioavailability, half-life and transport mechanisms. Vitamin K1 and MK-4 remain present in the plasma for 8–24 h, whereas long-chain menaquinones can be detected up to 96 h after administration. Geometric structure is also an important factor that conditions their properties. Cis-phylloquinone shows nearly no biological activity. An equivalent study for menaquinone is not available. The effective dose to decrease uncarboxylated osteocalcin was six times lower for MK-7 than for MK-4. Similarly, MK-7 affected blood coagulation system at dose three to four times lower than vitamin K1. Both vitamin K1 and MK-7 inhibited the decline in bone mineral density, however benefits for the occurrence of cardiovascular diseases have been observed only for long-chain menaquinones. There are currently no guidelines for the recommended doses and forms of vitamin K in the prevention of osteoporosis, atherosclerosis and other cardiovascular disorders. Due to the presence of isomers with unknown biological properties in some dietary supplements, quality and safety of that products may be questioned.
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Affiliation(s)
- Katarzyna Bus
- Department of Spectrometric Methods, National Medicines Institute, 30/34 Chełmska, 00-725 Warsaw, Poland
- Correspondence:
| | - Arkadiusz Szterk
- Center for Translational Medicine, Warsaw University of Life Sciences, Nowoursynowska 100, 02-797 Warsaw, Poland;
- Transfer of Science Sp. z o.o., Strzygłowska 15, 04-866 Warsaw, Poland
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10
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Nakajima T, Taya Y, Nishikawa T, Kitamura Y, Kato H, Mathis BJ, Hiramatsu Y. First Clinical Trial of a Newly Developed, Low Menaquinone-7, Fermented Soybean Natto in Warfarin-Dependent Patients. J Med Food 2021; 24:860-865. [PMID: 34406879 DOI: 10.1089/jmf.2021.0036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Bacillus subtilis fermented soybeans (natto) contain high vitamin K2 levels, mostly as menaquinone-7 (MK-7), and must be avoided by warfarin-dependent patients. This is the first report which demonstrates the characteristics and clinical relevance of a low MK-7 natto for such patients. We generated a novel, mutant B. subtilis strain TTCC2051 with short-term fermentation and reduced MK-7 production, yielding 19-24% of the normal MK-7 content. After functional assessments and a preclinical trial, 10 warfarin-dependent patients underwent a clinical trial with a 7-day ingestion test of the low MK-7 natto. Functional assessments were satisfactory, and the preclinical trial showed no increases in plasma MK-7 levels after 7 days of ingestion. In the clinical trial, 20 g/day of the low MK-7 natto significantly increased plasma MK-7 levels while 10 g/day did not. However, neither dose of low MK-7 natto changed international normalized ratio of prothrombin time (PT-INR) values in either group. The low MK-7 natto neither changed PT-INR values nor precipitated adverse events if ingested with a once-daily maximum of 20 g (46 μg of MK-7). Thus, this novel food product has potential for consumption by warfarin-dependent patients.
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Affiliation(s)
| | - Yuki Taya
- Laboratory, Takano Foods Co. Ltd., Omitama, Japan
| | | | - Yutaka Kitamura
- Faculty of Life & Environmental Sciences, University of Tsukuba, Tsukuba, Japan
| | - Hideyuki Kato
- Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Bryan J Mathis
- Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Yuji Hiramatsu
- Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
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11
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McBurney MI, Blumberg JB, Costello RB, Eggersdorfer M, Erdman JW, Harris WS, Johnson EJ, Hazels Mitmesser S, Post RC, Rai D, Schurgers LJ. Beyond Nutrient Deficiency-Opportunities to Improve Nutritional Status and Promote Health Modernizing DRIs and Supplementation Recommendations. Nutrients 2021; 13:1844. [PMID: 34071268 PMCID: PMC8229216 DOI: 10.3390/nu13061844] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 05/13/2021] [Accepted: 05/25/2021] [Indexed: 12/12/2022] Open
Abstract
The US Dietary Guidelines for Americans (DGA) provide dietary recommendations to meet nutrient needs, promote health, and prevent disease. Despite 40 years of DGA, the prevalence of under-consumed nutrients continues in the US and globally, although dietary supplement use can help to fill shortfalls. Nutrient recommendations are based on Dietary Reference Intakes (DRIs) to meet the nutrient requirements for nearly all (97 to 98 percent) healthy individuals in a particular life stage and gender group and many need to be updated using current evidence. There is an opportunity to modernize vitamin and mineral intake recommendations based on biomarker or surrogate endpoint levels needed to 'prevent deficiency' with DRIs based on ranges of biomarker or surrogate endpoints levels that support normal cell/organ/tissue function in healthy individuals, and to establish DRIs for bioactive compounds. We recommend vitamin K and Mg DRIs be updated and DRIs be established for lutein and eicosapentaenoic and docosahexaenoic acid (EPA + DHA). With increasing interest in personalized (or precision) nutrition, we propose greater research investment in validating biomarkers and metabolic health measures and the development and use of inexpensive diagnostic devices. Data generated from such approaches will help elucidate optimal nutrient status, provide objective evaluations of an individual's nutritional status, and serve to provide personalized nutrition guidance.
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Affiliation(s)
- Michael I. McBurney
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON N1H 0B5, Canada
- Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA 02111, USA; (J.B.B.); (E.J.J.)
| | - Jeffrey B. Blumberg
- Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA 02111, USA; (J.B.B.); (E.J.J.)
| | | | - Manfred Eggersdorfer
- Department of Internal Medicine, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands;
| | - John W. Erdman
- Department of Food Science and Human Nutrition, University of Illinois, Urbana-Champaign, IL 61801, USA;
| | - William S. Harris
- Department of Internal Medicine, University of South Dakota, Sioux Falls, SD 57105, USA;
- The Fatty Acid Research Institute, Sioux Falls, SD 57106, USA
| | - Elizabeth J. Johnson
- Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA 02111, USA; (J.B.B.); (E.J.J.)
| | | | - Robert C. Post
- FoodTrition Solutions, LLC, Hackettstown, NJ 07840, USA;
| | - Deshanie Rai
- Global Regulatory and Scientific Affairs, Omniactive Health Technologies, Morristown, NJ 07960, USA;
| | - Leon J. Schurgers
- Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), University of Maastricht, 6200 MD Maastricht, The Netherlands;
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12
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Solmaz I, Ozdemir MA, Unal E, Abdurrezzak U, Muhtaroglu S, Karakukcu M. Effect of vitamin K2 and vitamin D3 on bone mineral density in children with acute lymphoblastic leukemia: a prospective cohort study. J Pediatr Endocrinol Metab 2021; 34:441-447. [PMID: 33639045 DOI: 10.1515/jpem-2020-0637] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 11/25/2020] [Indexed: 12/15/2022]
Abstract
OBJECTIVES Current treatment protocols in acute lymphoblastic leukemia (ALL) are associated with high remission rates and long life expectancy, enhancing the importance of quality of life and prevention of treatment-related complications in patient care. As osteoporosis is a frequent complication in patients under chemotherapy, we investigated the effect of vitamin K2 (100 mcg menaquinone-7) and vitamin D3 (10 mcg calcitriol) on bone metabolism in children with ALL. METHODS Twenty-nine consecutive patients recently diagnosed with B precursor ALL (B-ALL) and treated according to the Turkish Acute Lymphoblastic Leukemia Berlin Frankfurt Münster 2000 protocol were randomly assigned into study and control groups. The study group (n=15, M/F: 8/7, age 1-14.5 years, mean 6.5 years) received vitamin K2 and vitamin D3 with their chemotherapy, while the control group (n=14, M/F 9/5, age 2-17 years, mean 7.1 years) received chemotherapy only. Serum calcium, phosphorus, magnesium, alkaline phosphatase, bone-specific alkaline phosphatase, uncarboxylated osteocalcin (ucOC), tartrate resistant acid phosphatase 5b, carboxyl terminal procollagen propeptide (PICP), osteoprotegerin (OPG), and receptor activator nuclear kappa B ligand (RANKL) were measured and bone mineral density (BMD) was determined at baseline and first, second, third and sixth months. RESULTS The study group had higher serum OPG/RANKL ratio and lower ucOC levels compared to the control group at the first month; PICP levels were higher in the study group at second and third months. CONCLUSIONS These results suggest an early beneficial effect of the combination of vitamin K2 and vitamin D3 on BMD in ALL patients especially during the period of intensive steroid therapy in the first months.
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Affiliation(s)
- Ismail Solmaz
- Division of Pediatric Hematology and Oncology, Department of Pediatrics, Faculty of Medicine, Erciyes University, Kayseri, Turkey.,Department of Pediatric Neurology, Hacettepe University, Ankara, Turkey
| | - Mehmet Akif Ozdemir
- Division of Pediatric Hematology and Oncology, Department of Pediatrics, Faculty of Medicine, Erciyes University, Kayseri, Turkey
| | - Ekrem Unal
- Division of Pediatric Hematology and Oncology, Department of Pediatrics, Faculty of Medicine, Erciyes University, Kayseri, Turkey
| | - Ummuhan Abdurrezzak
- Department of Nuclear Medicine, Faculty of Medicine, Erciyes University, Kayseri, Turkey
| | - Sebahattin Muhtaroglu
- Department of Biochemistry, Faculty of Medicine, Erciyes University, Kayseri, Turkey
| | - Musa Karakukcu
- Division of Pediatric Hematology and Oncology, Department of Pediatrics, Faculty of Medicine, Erciyes University, Kayseri, Turkey
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13
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The Dual Role of Vitamin K2 in "Bone-Vascular Crosstalk": Opposite Effects on Bone Loss and Vascular Calcification. Nutrients 2021; 13:nu13041222. [PMID: 33917175 PMCID: PMC8067793 DOI: 10.3390/nu13041222] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 03/30/2021] [Accepted: 04/04/2021] [Indexed: 12/13/2022] Open
Abstract
Osteoporosis (OP) and vascular calcification (VC) represent relevant health problems that frequently coexist in the elderly population. Traditionally, they have been considered independent processes, and mainly age-related. However, an increasing number of studies have reported their possible direct correlation, commonly defined as “bone-vascular crosstalk”. Vitamin K2 (VitK2), a family of several natural isoforms also known as menaquinones (MK), has recently received particular attention for its role in maintaining calcium homeostasis. In particular, VitK2 deficiency seems to be responsible of the so-called “calcium paradox” phenomenon, characterized by low calcium deposition in the bone and its accumulation in the vessel wall. Since these events may have important clinical consequences, and the role of VitK2 in bone-vascular crosstalk has only partially been explained, this review focuses on its effects on the bone and vascular system by providing a more recent literature update. Overall, the findings reported here propose the VitK2 family as natural bioactive molecules that could be able to play an important role in the prevention of bone loss and vascular calcification, thus encouraging further in-depth studies to achieve its use as a dietary food supplement.
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14
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AlHajri L, Ayoub A, Ahmed H, AlMulla M. Effect of Vitamin K2 Alone or in Combination on Various Bone Turnover Markers Amongst Postmenopausal Females. J Bone Metab 2021; 28:11-26. [PMID: 33730780 PMCID: PMC7973400 DOI: 10.11005/jbm.2021.28.1.11] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Accepted: 01/28/2021] [Indexed: 11/27/2022] Open
Abstract
Background Osteoporosis is common in postmenopausal women. Some studies have demonstrated the usefulness of vitamin K through the action of bone-specific proteins and osteoblast and osteoclast activities. However, no systematic review had explored this aspect in postmenopausal women. Hence, this systematic review aimed to explore the effect of vitamin K2 alone or in combination with other agents (vitamin D3 or calcium) on various bone turnover markers (BTMs) and bone mineral density (BMD) in postmenopausal women. Methods MEDLINE, ScienceDirect, PubMed, and Google Scholar were searched to identify relevant studies using specific inclusion criteria. Data extraction and quality assessment were carried out using standardized tests, and the results were narratively synthesized and presented in the form of tables. Results Vitamin K2 was beneficial in inducing an improvement or preventing deterioration, as evidenced by the BMD and osteocalcin (OC), undercarboxylated OC (ucOC), carboxylated OC (cOC), and γ-carboxylated OC levels. However, its effect was not conclusive when procollagen type 1 N-terminal propeptide, carboxyterminal propeptide of type I procollagen, C-terminal telopeptide of type I collagen, bone alkaline phosphatase, deoxypyridinoline, and N-terminal telopeptide levels (NTX) and ucOC:cOC or cOC:ucOC, and NTX:creatinine ratios were examined. Conclusions Vitamin K2 supplementation combined with vitamin D and calcium was found to be advantageous. However, vitamin K2 supplementation cannot replace the existing treatment options. In addition, vitamin K2 should be used with caution, considering its interactions with food and other drugs.
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Affiliation(s)
- Lamia AlHajri
- Department of Health Sciences and Pharmacy, Higher Colleges of Technology, Dubai, United Arab Emirates.,Department of Health Research, Lancaster University, Lancaster, UK
| | - Amna Ayoub
- United Arab Emirates University, Al Ain, United Arab Emirates
| | - Hessa Ahmed
- Department of Health Sciences and Pharmacy, Higher Colleges of Technology, Dubai, United Arab Emirates
| | - Marwa AlMulla
- Department of Health Sciences and Pharmacy, Higher Colleges of Technology, Dubai, United Arab Emirates
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15
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Kratz M, Zelnick LR, Trenchevska O, Jeffs JW, Borges CR, Tseng HH, Booth SL, Kestenbaum BR, Utzschneider KM, de Boer IH. Relationship Between Chronic Kidney Disease, Glucose Homeostasis, and Plasma Osteocalcin Carboxylation and Fragmentation. J Ren Nutr 2020; 31:248-256. [PMID: 32693970 DOI: 10.1053/j.jrn.2020.05.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 04/17/2020] [Accepted: 05/16/2020] [Indexed: 11/11/2022] Open
Abstract
OBJECTIVE Chronic kidney disease (CKD) is associated with reduced insulin sensitivity, through mechanisms that are not well understood. Low vitamin K intake and incomplete carboxylation of the vitamin K-dependent protein osteocalcin may promote insulin resistance. We assessed relationships of osteocalcin concentration, carboxylation, and fragmentation with CKD and glucose homeostasis in a cross-sectional study. METHODS We included 87 participants without diabetes: 50 (27 female) with moderate to severe CKD (estimated glomerular filtration rate <60 mL/min/1.73 m2 not treated with dialysis) and 37 (17 female) healthy controls. Total osteocalcin was measured by immunoassay, and osteocalcin carboxylation and fragmentation status by liquid chromatography-electrospray ionization-based mass spectrometric immunoassay. Endpoints included glucose tolerance (based on 2-hour oral glucose tolerance test), insulin sensitivity (hyperinsulinemic-euglycemic clamp), and pancreatic beta-cell function (intravenous glucose tolerance test). RESULTS The total plasma osteocalcin concentration was higher in the CKD group (mean [standard deviation] 102.9 [147.5]) than that in the control group (53.6 [51.1] ng/mL, P = .03), and more osteocalcin was circulating as fragments. The extent of osteocalcin carbocylation did not differ between individuals with and without CKD. Osteocalcin concentration, carboxylation, and fragmentation were not associated with any measure of glucose homeostasis in multivariable-adjusted analyses. CONCLUSIONS In CKD, circulating osteocalcin concentrations are elevated, in part due to larger proportions of fragmented forms. However, osteocalcin carboxylation status is not significantly different between individuals with and without CKD. Our data also do not provide support for the hypothesis that differences in osteocalcin carboxylation may explain reduced insulin sensitivity in individuals with CKD.
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Affiliation(s)
- Mario Kratz
- Fred Hutchinson Cancer Research Center, Cancer Prevention Program, Public Health Sciences Division, Seattle, Washington; Department of Epidemiology, University of Washington, Seattle, Washington; Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, Washington.
| | - Leila R Zelnick
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, Washington
| | - Olgica Trenchevska
- School of Molecular Sciences and The Biodesign Institute, Arizona State University, Tempe, Arizona
| | - Joshua W Jeffs
- School of Molecular Sciences and The Biodesign Institute, Arizona State University, Tempe, Arizona
| | - Chad R Borges
- School of Molecular Sciences and The Biodesign Institute, Arizona State University, Tempe, Arizona
| | - Hsin-Hui Tseng
- Fred Hutchinson Cancer Research Center, Cancer Prevention Program, Public Health Sciences Division, Seattle, Washington; Department of Epidemiology, University of Washington, Seattle, Washington
| | - Sarah L Booth
- Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, Massachusetts
| | - Bryan R Kestenbaum
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, Washington
| | - Kristina M Utzschneider
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, Washington; VA Puget Sound Healthcare System, Division of Endocrinology, Seattle, Washington
| | - Ian H de Boer
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, Washington; VA Puget Sound Healthcare System, Division of Nephrology, Seattle, Washington
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16
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Chatron N, Abi Khalil R, Benoit E, Lattard V. Structural Investigation of the Vitamin K Epoxide Reductase (VKORC1) Binding Site with Vitamin K. Biochemistry 2020; 59:1351-1360. [PMID: 32182040 DOI: 10.1021/acs.biochem.9b01084] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The vitamin K epoxide reductase (VKORC1) enzyme is of primary importance in many physiological processes, i.e., blood coagulation, energy metabolism, and arterial calcification prevention, due to its role in the vitamin K cycle. Indeed, VKORC1 catalyzes reduction of vitamin K epoxide to quinone and then to hydroquinone. However, the three-dimensional VKORC1 structure remains experimentally undetermined, because of the endoplasmic reticulum membrane location of this enzyme. Here we present a molecular modeling investigation of the VKORC1 enzymatic site structure and function, supported by in vitro enzymatic assays. Four VKORC1 mutants were designed in silico (F55G, F55Y, N80G, and F83G) based on a previous study that identified residues F55, N80, and F83 as being crucial for vitamin K epoxide binding. F55G, N80G, and F83G nonconservative mutants were all predicted to be inactive by molecular modeling analyses. However, the F55Y conservative mutant was expected to be active compared to wild-type VKORC1. In vitro enzymatic assays performed on recombinant proteins assessed our molecular modeling hypotheses and led us to describe the role of accurate VKORC1 active site residues with respect to VKORC1. Residues F55, N80, and F83 appeared to act in a concerted manner to keep vitamin K epoxide close to the C135 catalytic residue. Residues F55 and N80 prevent naphthoquinone head rotation away from the active site, assisted by residue F83 that prevents vitamin K from sliding outside the enzymatic pocket, through hydrophobic tail stabilization. Our results thus highlighted the specific functions of VKORC1 catalytic pocket residues and evidenced the ability of our structural model to predict biological effects of VKORC1 mutations.
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Affiliation(s)
- Nolan Chatron
- USC 1233 RS2GP, INRA, VetAgro Sup, Univ Lyon, F-69280 Marcy l'Etoile, France
| | - Rami Abi Khalil
- USC 1233 RS2GP, INRA, VetAgro Sup, Univ Lyon, F-69280 Marcy l'Etoile, France
| | - Etienne Benoit
- USC 1233 RS2GP, INRA, VetAgro Sup, Univ Lyon, F-69280 Marcy l'Etoile, France
| | - Virginie Lattard
- USC 1233 RS2GP, INRA, VetAgro Sup, Univ Lyon, F-69280 Marcy l'Etoile, France
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17
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Establishment of the Variation of Vitamin K Status According to Vkorc1 Point Mutations Using Rat Models. Nutrients 2019; 11:nu11092076. [PMID: 31484376 PMCID: PMC6770205 DOI: 10.3390/nu11092076] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 08/27/2019] [Accepted: 08/28/2019] [Indexed: 01/16/2023] Open
Abstract
Vitamin K is crucial for many physiological processes such as coagulation, energy metabolism, and arterial calcification prevention due to its involvement in the activation of several vitamin K-dependent proteins. During this activation, vitamin K is converted into vitamin K epoxide, which must be re-reduced by the VKORC1 enzyme. Various VKORC1 mutations have been described in humans. While these mutations have been widely associated with anticoagulant resistance, their association with a modification of vitamin K status due to a modification of the enzyme efficiency has never been considered. Using animal models with different Vkorc1 mutations receiving a standard diet or a menadione-deficient diet, we investigated this association by measuring different markers of the vitamin K status. Each mutation dramatically affected vitamin K recycling efficiency. This decrease in recycling was associated with a significant alteration of the vitamin K status, even when animals were fed a menadione-enriched diet suggesting a loss of vitamin K from the cycle due to the presence of the Vkorc1 mutation. This change in vitamin K status resulted in clinical modifications in mutated rats only when animals receive a limited vitamin K intake totally consistent with the capacity of each strain to recycle vitamin K.
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18
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Structural Insights into Phylloquinone (Vitamin K1), Menaquinone (MK4, MK7), and Menadione (Vitamin K3) Binding to VKORC1. Nutrients 2019; 11:nu11010067. [PMID: 30609653 PMCID: PMC6357001 DOI: 10.3390/nu11010067] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 12/21/2018] [Accepted: 12/24/2018] [Indexed: 11/17/2022] Open
Abstract
Vitamin K family molecules-phylloquinone (K1), menaquinone (K2), and menadione (K3)-act as γ-glutamyl carboxylase (GGCX)-exclusive cofactors in their hydroquinone state, activating proteins of main importance for blood coagulation in the liver and for arterial calcification prevention and energy metabolism in extrahepatic tissues. Once GGCX is activated, vitamin K is found in the epoxide state, which is then recycled to quinone and hydroquinone states by vitamin K epoxide reductase (VKORC1). Nevertheless, little information is available concerning vitamin K1, K2, or K3 tissue distribution and preferential interactions towards VKORC1. Here we present a molecular modeling study of vitamin K1, menaquinones 4, 7 (MK4, MK7), and K3 structural interactions with VKORC1. VKORC1 was shown to tightly bind vitamins K1 and MK4 in the epoxide and quinone states, but not in the hydroquinone state; five VKORC1 residues were identified as crucial for vitamin K stabilization, and two other ones were essential for hydrogen bond formation. However, vitamin MK7 revealed shaky binding towards VKORC1, induced by hydrophobic tail interactions with the membrane. Vitamin K3 exhibited the lowest affinity with VKORC1 because of the absence of a hydrophobic tail, preventing structural stabilization by the enzyme. Enzymatic activity towards vitamins K1, MK4, MK7, and K3 was also evaluated by in vitro assays, validating our in silico predictions: VKORC1 presented equivalent activities towards vitamins K1 and MK4, but much lower activity with respect to vitamin MK7, and no activity towards vitamin K3. Our results revealed VKORC1's ability to recycle both phylloquinone and some menaquinones, and also highlighted the importance of vitamin K's hydrophobic tail size and membrane interactions.
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Volkan B, Fettah A, İşlek A, Kara SS, Kurt N, Çayır A. Bone mineral density and vitamin K status in children with celiac disease: Is there a relation? TURKISH JOURNAL OF GASTROENTEROLOGY 2018; 29:215-220. [PMID: 29749330 DOI: 10.5152/tjg.2018.17451] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
BACKGROUND/AIMS To investigate bone mineral density (BMD) in children with celiac disease (CD) and to evaluate the association between vitamin K levels and osteoporosis. MATERIALS AND METHODS Children with CD and age- and sex-matched healthy control subjects were prospectively included in the study. BMD was measured, and serum anti-tissue transglutaminase IgA, ferritin, folate, vitamin B12, 25-hydroxy vitamin D and K2, calcium, phosphate, alkaline phosphatase, and parathormone were assayed in all subjects. RESULTS Overall, 72 patients (mean age 11.69±3 years, 59.7% female) and 30 healthy subjects (mean age 12.27±2.12 years, 63.3% female) were enrolled. The mean BMD Z score of the celiac group was significantly lower than that of the control group (-1.23±1.07 vs. -0.35±1.04, p=0.001). Vitamin D and K2 values did not differ significantly between the two groups (p > 0.05). BMD was positively correlated with vitamin D (r=0.198, p=0.001) and negatively with PTH (r=-0.397, p=0.002). CONCLUSION The BMD of celiac patients was lower than that of the control subjects. There was no difference in terms of vitamin D and K2 levels between the two groups. Further studies investigating the level and effect of vitamin K on bone in CD are needed.
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Affiliation(s)
- Burcu Volkan
- Department of Pediatric Gastroenterology, Erzurum Regional Training and Research Hospital, Erzurum, Turkey
| | - Ali Fettah
- Department of Pediatrics, Erzurum Regional Training and Research Hospital, Erzurum, Turkey
| | - Ali İşlek
- Department of Pediatric Gastroenterology, Atatürk University School of Medicine, Erzurum, Turkey
| | - Soner Sertan Kara
- Department of Pediatrics, Erzurum Regional Training and Research Hospital, Erzurum, Turkey
| | - Nezahat Kurt
- Department of Biochemistry, Atatürk University School of Medicine, Erzurum, Turkey
| | - Atilla Çayır
- Department of Pediatric Endocrinology, Erzurum Regional Training and Research Hospital, Erzurum, Turkey
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Popko J, Karpiński M, Chojnowska S, Maresz K, Milewski R, Badmaev V, Schurgers LJ. Decreased Levels of Circulating Carboxylated Osteocalcin in Children with Low Energy Fractures: A Pilot Study. Nutrients 2018; 10:E734. [PMID: 29882816 PMCID: PMC6024307 DOI: 10.3390/nu10060734] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 06/01/2018] [Accepted: 06/05/2018] [Indexed: 01/21/2023] Open
Abstract
OBJECTIVE In the past decades, an increased interest in the roles of vitamin D and K has become evident, in particular in relation to bone health and prevention of bone fractures. The aim of the current study was to evaluate vitamin D and K status in children with low-energy fractures and in children without fractures. METHODS The study group of 20 children (14 boys, 6 girls) aged 5 to 15 years old, with radiologically confirmed low-energy fractures was compared with the control group of 19 healthy children (9 boys, 10 girls), aged 7 to 17 years old, without fractures. Total vitamin D (25(OH)D3 plus 25(OH)D2), calcium, BALP (bone alkaline phosphatase), NTx (N-terminal telopeptide), and uncarboxylated (ucOC) and carboxylated osteocalcin (cOC) serum concentrations were evaluated. Ratio of serum uncarboxylated osteocalcin to serum carboxylated osteocalcin ucOC:cOC (UCR) was used as an indicator of bone vitamin K status. Logistic regression models were created to establish UCR influence for odds ratio of low-energy fractures in both groups. RESULTS There were no statistically significant differences in the serum calcium, NTx, BALP, or total vitamin D levels between the two groups. There was, however, a statistically significant difference in the UCR ratio. The median UCR in the fracture group was 0.471 compared with the control group value of 0.245 (p < 0.0001). In the logistic regression analysis, odds ratio of low-energy fractures for UCR was calculated, with an increased risk of fractures by some 78.3 times. CONCLUSIONS In this pilot study, better vitamin K status expressed as the ratio of ucOC:cOC-UCR—is positively and statistically significantly correlated with lower rate of low-energy fracture incidence.
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Affiliation(s)
- Janusz Popko
- Department of Pediatric Orthopedics and Traumatology, Medical University of Białystok, 15-089 Białystok, Poland.
| | - Michał Karpiński
- Department of Pediatric Orthopedics and Traumatology, Medical University of Białystok, 15-089 Białystok, Poland.
| | - Sylwia Chojnowska
- Faculty of Health Sciences, Lomza State University of Applied Sciences, 18-400 Łomża, Poland.
| | - Katarzyna Maresz
- International Science &Health Foundation, 30-148 Krakow, Poland.
| | - Robert Milewski
- Department of Statistics and Medical Informatics, Medical University of Białystok, 15-089 Białystok, Poland.
| | | | - Leon J Schurgers
- Department of Biochemistry, Cardiovascular Research Institute Maastricht, University Maastricht, 6200 MD Maastricht, The Netherlands.
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Karpiński M, Popko J, Maresz K, Badmaev V, Stohs SJ. Roles of Vitamins D and K, Nutrition, and Lifestyle in Low-Energy Bone Fractures in Children and Young Adults. J Am Coll Nutr 2018; 36:399-412. [PMID: 28686548 DOI: 10.1080/07315724.2017.1307791] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The research on skeletal system health in children and young adults, while recognizing the important role of calcium and vitamin D, goes beyond these nutritional standards. This review focuses on the role of vitamin K in combination with vitamin D and other factors in bone health. The current understanding is that maintaining bone health and prevention of low-energy fractures in any pediatric population includes nutritional factors combined with an active lifestyle. Calcium, vitamin D, and vitamin K supplementation contribute independently and collectively to bone health. The beneficial role of vitamin K, particularly vitamin K2 as menaquinone-7 (MK-7), in bone and cardiovascular health is reasonably well supported scientifically, with several preclinical, epidemiological, and clinical studies published over the last decade. Osteocalcin and matrix-Gla (glutamate-containing) protein (MGP) exemplify vitamin K-dependent proteins involved in building bone matrix and keeping calcium from accumulating in the arterial walls, respectively. An important part of the mechanism of vitamin K involves carboxylation and posttranslational activation of the family of vitamin K-dependent proteins, which prevent expression of pro-inflammatory factors and support improvement in bone mineral concentration, bone mineral density, and the quality of bone matrix. Understanding the combined approach to a healthy skeletal system in children and young adults, including the roles of vitamins D and K, calcium, healthy diet, and exercise, is particularly important in view of reports of subclinical insufficiency of vitamins D and K in otherwise healthy pediatric populations with low-energy bone fractures.
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Affiliation(s)
- Michał Karpiński
- a Department of Pediatric Orthopedics and Traumatology Medical University of Bialystok , Bialystok , Poland
| | - Janusz Popko
- b Medical Institute of the State College of Computer Science and Business Administration , Łomża , Poland
| | | | | | - Sidney J Stohs
- e Creighton University Medical Center , Omaha , Nebraska
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van Ballegooijen AJ, Cepelis A, Visser M, Brouwer IA, van Schoor NM, Beulens JW. Joint Association of Low Vitamin D and Vitamin K Status With Blood Pressure and Hypertension. Hypertension 2017; 69:1165-1172. [DOI: 10.1161/hypertensionaha.116.08869] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Revised: 12/21/2016] [Accepted: 03/13/2017] [Indexed: 01/07/2023]
Abstract
Low vitamin D and K status are both associated with an increased cardiovascular risk. New evidence from experimental studies on bone health suggest an interaction between vitamin D and K; however, a joint association with vascular health outcomes is largely unknown. To prospectively investigate whether the combination of low vitamin D and K status is associated with higher systolic and diastolic blood pressure in 402 participants and with incident hypertension in 231 participants free of hypertension at baseline. We used data from a subsample of the Longitudinal Aging Study Amsterdam, a population-based cohort of Dutch participants aged 55 to 65 years. Vitamin D and K status were assessed by 25-hydroxyvitamin D and dp-ucMGP (dephosphorylated uncarboxylated matrix gla protein) concentrations (high dp-ucMGP is indicative for low vitamin K status) in stored samples from 2002 to 2003. Vitamin D and K status were categorized into 25-hydroxyvitamin D <50/≥50 mmol/L and median dp-ucMGP <323/≥323 pmol/L. During a median follow-up of 6.4 years, 62% of the participants (n=143) developed hypertension. The combination of low vitamin D and K status was associated with increased systolic 4.8 mm Hg (95% confidence interval, 0.1–9.5) and diastolic 3.1 mm Hg (95% confidence interval, 0.5–5.7) blood pressure compared with high vitamin D and K status (
P
for interaction =0.013 for systolic blood pressure and 0.068 for diastolic blood pressure). A similar trend was seen for incident hypertension: hazard ratio=1.62 (95% confidence interval, 0.96–2.73) for the low vitamin D and K group. The combination of low vitamin D and K status was associated with increased blood pressure and a trend for greater hypertension risk.
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Affiliation(s)
- Adriana J. van Ballegooijen
- From the Department of Health Sciences, and the EMGO+ Institute for Health and Care Research (A.J.v.B., A.C., M.V., I.A.B.), Department of Internal Medicine, Section of Nutrition and Dietetics (M.V.), and Department of Epidemiology and Biostatistics, EMGO+ Institute for Health and Care Research (N.M.v.S., J.W.B.), VU University Medical Center, Amsterdam; and Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht (J.W.B.)
| | - Aivaras Cepelis
- From the Department of Health Sciences, and the EMGO+ Institute for Health and Care Research (A.J.v.B., A.C., M.V., I.A.B.), Department of Internal Medicine, Section of Nutrition and Dietetics (M.V.), and Department of Epidemiology and Biostatistics, EMGO+ Institute for Health and Care Research (N.M.v.S., J.W.B.), VU University Medical Center, Amsterdam; and Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht (J.W.B.)
| | - Marjolein Visser
- From the Department of Health Sciences, and the EMGO+ Institute for Health and Care Research (A.J.v.B., A.C., M.V., I.A.B.), Department of Internal Medicine, Section of Nutrition and Dietetics (M.V.), and Department of Epidemiology and Biostatistics, EMGO+ Institute for Health and Care Research (N.M.v.S., J.W.B.), VU University Medical Center, Amsterdam; and Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht (J.W.B.)
| | - Ingeborg A. Brouwer
- From the Department of Health Sciences, and the EMGO+ Institute for Health and Care Research (A.J.v.B., A.C., M.V., I.A.B.), Department of Internal Medicine, Section of Nutrition and Dietetics (M.V.), and Department of Epidemiology and Biostatistics, EMGO+ Institute for Health and Care Research (N.M.v.S., J.W.B.), VU University Medical Center, Amsterdam; and Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht (J.W.B.)
| | - Natasja M. van Schoor
- From the Department of Health Sciences, and the EMGO+ Institute for Health and Care Research (A.J.v.B., A.C., M.V., I.A.B.), Department of Internal Medicine, Section of Nutrition and Dietetics (M.V.), and Department of Epidemiology and Biostatistics, EMGO+ Institute for Health and Care Research (N.M.v.S., J.W.B.), VU University Medical Center, Amsterdam; and Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht (J.W.B.)
| | - Joline W. Beulens
- From the Department of Health Sciences, and the EMGO+ Institute for Health and Care Research (A.J.v.B., A.C., M.V., I.A.B.), Department of Internal Medicine, Section of Nutrition and Dietetics (M.V.), and Department of Epidemiology and Biostatistics, EMGO+ Institute for Health and Care Research (N.M.v.S., J.W.B.), VU University Medical Center, Amsterdam; and Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht (J.W.B.)
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Turck D, Bresson JL, Burlingame B, Dean T, Fairweather-Tait S, Heinonen M, Hirsch-Ernst KI, Mangelsdorf I, McArdle HJ, Naska A, Nowicka G, Pentieva K, Sanz Y, Siani A, Sjödin A, Stern M, Tomé D, Van Loveren H, Vinceti M, Willatts P, Lamberg-Allardt C, Przyrembel H, Tetens I, Dumas C, Fabiani L, Ioannidou S, Neuhäuser-Berthold M. Dietary reference values for vitamin K. EFSA J 2017; 15:e04780. [PMID: 32625486 PMCID: PMC7010012 DOI: 10.2903/j.efsa.2017.4780] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Following a request from the European Commission, the EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA) derives dietary reference values (DRVs) for vitamin K. In this Opinion, the Panel considers vitamin K to comprise both phylloquinone and menaquinones. The Panel considers that none of the biomarkers of vitamin K intake or status is suitable by itself to derive DRVs for vitamin K. Several health outcomes possibly associated with vitamin K intake were also considered but data could not be used to establish DRVs. The Panel considers that average requirements and population reference intakes for vitamin K cannot be derived for adults, infants and children, and therefore sets adequate intakes (AIs). The Panel considers that available evidence on occurrence, absorption, function and content in the body or organs of menaquinones is insufficient, and, therefore, sets AIs for phylloquinone only. Having assessed additional evidence available since 1993 in particular related to biomarkers, intake data and the factorial approach, which all are associated with considerable uncertainties, the Panel maintains the reference value proposed by the Scientific Committee for Food (SCF) in 1993. An AI of 1 μg phylloquinone/kg body weight per day is set for all age and sex population groups. Considering the respective reference body weights, AIs for phylloquinone are set at 70 μg/day for all adults including pregnant and lactating women, at 10 μg/day for infants aged 7-11 months, and between 12 μg/day for children aged 1-3 years and 65 μg/day for children aged 15-17 years.
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24
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Fung EB. The importance of nutrition for health in patients with transfusion-dependent thalassemia. Ann N Y Acad Sci 2016; 1368:40-8. [DOI: 10.1111/nyas.13003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 12/14/2015] [Accepted: 12/16/2015] [Indexed: 01/19/2023]
Affiliation(s)
- Ellen B. Fung
- University of California; San Francisco Benioff Children's Hospital Oakland; Oakland California
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Knapen MHJ, Braam LAJLM, Teunissen KJ, Zwijsen RML, Theuwissen E, Vermeer C. Yogurt drink fortified with menaquinone-7 improves vitamin K status in a healthy population. J Nutr Sci 2015; 4:e35. [PMID: 26495126 PMCID: PMC4611080 DOI: 10.1017/jns.2015.25] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Revised: 09/01/2015] [Accepted: 09/02/2015] [Indexed: 02/07/2023] Open
Abstract
Population-based studies have shown an inverse association between dietary menaquinones (MK-n, vitamin K2) intake, coronary calcification and CHD risk, suggesting a potential role of vitamin K in vascular health. To date, the effects of increased menaquinone intake on (markers of) vascular health have been investigated using predominantly food supplements. Dairy products contain many essential nutrients and can serve as a good matrix for food fortification in order to support health. We were therefore interested to study the effects of a menaquinone-fortified yogurt drink (menaquinone as menaquinone-7 (MK-7); 28 µg MK-7/yogurt drink) on vitamin K status and markers of vascular health. The yogurt drink was also fortified with n-3 PUFA, vitamin D, vitamin C, Ca and Mg to support vascular and/or general health. Healthy men (n 32) and postmenopausal women (n 28) with a mean age of 56 (sd 5) years received either basic or fortified yogurt drink twice per d for 12 weeks. MK-7 was efficiently absorbed from the fortified yogurt drink. Levels of circulating MK-7 were significantly increased from 0·28 to 1·94 ng/ml. In accordance, intake of the fortified yogurt drink improved vitamin K status, as measured by significant decreases in uncarboxylated osteocalcin and desphospho-uncarboxylated matrix Gla-protein. No effects were, however, seen on markers of inflammation, endothelial dysfunction and lipid metabolism. In summary, consumption of a yogurt drink fortified with low doses of among others MK-7 for 3 months significantly improved vitamin K status in a healthy population.
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Affiliation(s)
- Marjo H. J. Knapen
- R&D Group VitaK, Maastricht University, Oxfordlaan 70, 6229 EV Maastricht, The Netherlands
| | | | - Kirsten J. Teunissen
- R&D Group VitaK, Maastricht University, Oxfordlaan 70, 6229 EV Maastricht, The Netherlands
| | | | - Elke Theuwissen
- R&D Group VitaK, Maastricht University, Oxfordlaan 70, 6229 EV Maastricht, The Netherlands
| | - Cees Vermeer
- R&D Group VitaK, Maastricht University, Oxfordlaan 70, 6229 EV Maastricht, The Netherlands
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Gröber U, Reichrath J, Holick MF, Kisters K. Vitamin K: an old vitamin in a new perspective. DERMATO-ENDOCRINOLOGY 2015; 6:e968490. [PMID: 26413183 PMCID: PMC4580041 DOI: 10.4161/19381972.2014.968490] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Accepted: 09/07/2014] [Indexed: 12/11/2022]
Abstract
The topic of "Vitamin K" is currently booming on the health products market. Vitamin K is known to be important for blood coagulation. Current research increasingly indicates that the antihaemorrhagic vitamin has a considerable benefit in the prevention and treatment of bone and vascular disease. Vitamin K1 (phylloquinone) is more abundant in foods but less bioactive than the vitamin K2 menaquinones (especially MK-7, menaquinone-7). Vitamin K compounds undergo oxidation-reduction cycling within the endoplasmic reticulum membrane, donating electrons to activate specific proteins via enzymatic gamma-carboxylation of glutamate groups before being enzymatically reduced. Along with coagulation factors (II, VII, IX, X, and prothrombin), protein C and protein S, osteocalcin (OC), matrix Gla protein (MGP), periostin, Gas6, and other vitamin K-dependent (VKD) proteins support calcium homeostasis, inhibit vessel wall calcification, support endothelial integrity, facilitate bone mineralization, are involved in tissue renewal and cell growth control, and have numerous other effects. The following review describes the history of vitamin K, the physiological significance of the K vitamers, updates skeletal and cardiovascular benefits and important interactions with drugs.
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Affiliation(s)
- U Gröber
- Academy for Micronutrient Medicine ; Essen, Germany
| | - J Reichrath
- Saarland University Clinics ; Homburg/Saar, Germany
| | - M F Holick
- Boston University Medical Center ; Boston, MA USA
| | - K Kisters
- Academy for Micronutrient Medicine ; Essen, Germany ; St. Anna Hospital; Medical Clinic 1 ; Herne, Germany
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Ma S, Shen L, Chen M, Lin X, Wang Q, Du R, Feng Y. The study of metabonomics combined with diversity of intestinal flora in LDP intervention in kidney-yin deficiency hyperthyroid rats. RSC Adv 2015. [DOI: 10.1039/c5ra10134d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
This study was to clarify the drug mechanism in the preparation of high-content plant polysaccharides.
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Affiliation(s)
- Shiyu Ma
- School of Traditional Chinese Medicine
- Shanghai University of Traditional Chinese Medicine
- Shanghai 201203
- China
| | - Lan Shen
- School of Traditional Chinese Medicine
- Shanghai University of Traditional Chinese Medicine
- Shanghai 201203
- China
- Engineering Research Center of Modern Preparation Technology of Traditional Chinese Medicine of Ministry of Education
| | - Meiwan Chen
- State Key Laboratory of Quality Research in Chinese Medicine
- Institute of Chinese Medical Sciences
- University of Macau
- Macao 999078
- China
| | - Xiao Lin
- School of Traditional Chinese Medicine
- Shanghai University of Traditional Chinese Medicine
- Shanghai 201203
- China
- Engineering Research Center of Modern Preparation Technology of Traditional Chinese Medicine of Ministry of Education
| | - Qiang Wang
- School of Traditional Chinese Medicine
- Shanghai University of Traditional Chinese Medicine
- Shanghai 201203
- China
| | - Ruofei Du
- School of Traditional Chinese Medicine
- Shanghai University of Traditional Chinese Medicine
- Shanghai 201203
- China
| | - Yi Feng
- Engineering Research Center of Modern Preparation Technology of Traditional Chinese Medicine of Ministry of Education
- Shanghai University of Traditional Chinese Medicine
- Shanghai 201203
- China
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Theuwissen E, Magdeleyns EJ, Braam LAJLM, Teunissen KJ, Knapen MH, Binnekamp IAG, van Summeren MJH, Vermeer C. Vitamin K status in healthy volunteers. Food Funct 2014; 5:229-34. [PMID: 24296867 DOI: 10.1039/c3fo60464k] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Vitamin K's recommended dietary allowance (RDA) is based on the hepatic requirement for clotting factor synthesis, but substantial concentrations of undercarboxylated extra-hepatic Gla-proteins are found in the circulation of non-supplemented individuals. This suggests that vitamin K intake above the RDA is required for an optimal extra-hepatic vitamin K status. Circulating uncarboxylated osteocalcin (ucOC) and desphospho-uncarboxylated matrix Gla-protein (dp-ucMGP) are considered markers of the vitamin K status in bone and the vasculature, respectively. We measured these markers in 896 samples of healthy volunteers and defined target groups for vitamin K supplementation based on increased levels indicative of tissue-specific vitamin K deficiency. We studied the response to vitamin K supplements at different states of vitamin K deficiency by measuring the circulating dp-ucMGP level in samples from two short-term trials on menaquinone-7 (MK-7, vitamin K2) supplementation in 42 children and 68 adults. Children had high ucOC levels (3.4-96.9 ng ml(-1)); other age groups had values in the range of 1.5-5.0 ng ml(-1). From the age of 40 years, dp-ucMGP levels gradually increased. Children and adults with more pronounced vitamin K deficiency gave the highest responses to MK-7 supplementation. Children and adults above 40 years showed the largest tissue-specific vitamin deficiency and accordingly may benefit from MK-7 supplementation to improve their extra-hepatic vitamin K status.
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Affiliation(s)
- E Theuwissen
- VitaK, Maastricht University, Oxfordlaan 70, 6229 EV Maastricht, The Netherlands.
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Derepas C, Kosar C, Avitzur Y, Wales PW, Courtney-Martin G. Decreased Bone Turnover Markers in Children on Long-Term Parenteral Nutrition (PN) for Intestinal Failure (IF). JPEN J Parenter Enteral Nutr 2013; 39:85-94. [DOI: 10.1177/0148607113500695] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Charlène Derepas
- Research Institute, The Hospital for Sick Children, Toronto, Canada
| | - Christina Kosar
- Research Institute, The Hospital for Sick Children, Toronto, Canada
- Group for Improvement of Intestinal Function and Treatment (GIFT), The Hospital for Sick Children, Toronto, Canada
| | - Yaron Avitzur
- Research Institute, The Hospital for Sick Children, Toronto, Canada
- Group for Improvement of Intestinal Function and Treatment (GIFT), The Hospital for Sick Children, Toronto, Canada
- The Department of Pediatrics, University of Toronto, Toronto, Canada
| | - Paul W. Wales
- Research Institute, The Hospital for Sick Children, Toronto, Canada
- Group for Improvement of Intestinal Function and Treatment (GIFT), The Hospital for Sick Children, Toronto, Canada
- The Department of Surgery, University of Toronto, Toronto, Canada
| | - Glenda Courtney-Martin
- Research Institute, The Hospital for Sick Children, Toronto, Canada
- Group for Improvement of Intestinal Function and Treatment (GIFT), The Hospital for Sick Children, Toronto, Canada
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Abstract
Recent reports have attributed the potential health benefits of vitamin K beyond its function to activate hepatic coagulation factors. Moreover, several studies have suggested that menaquinones, also known as vitamin K2, may be more effective in activating extra-hepatic vitamin K-dependent proteins than phylloquinone, also known as vitamin K1. Nevertheless, present dietary reference values (DRV) for vitamin K are exclusively based on phylloquinone, and its function in coagulation. The present review describes the current knowledge on menaquinones based on the following criteria for setting DRV: optimal dietary intake; nutrient amount required to prevent deficiency, maintain optimal body stores and/or prevent chronic disease; factors influencing requirements such as absorption, metabolism, age and sex. Dietary intake of menaquinones accounts for up to 25% of total vitamin K intake and contributes to the biological functions of vitamin K. However, menaquinones are different from phylloquinone with respect to their chemical structure and pharmacokinetics, which affects bioavailability, metabolism and perhaps impact on health outcomes. There are significant gaps in the current knowledge on menaquinones based on the criteria for setting DRV. Therefore, we conclude that further investigations are needed to establish how differences among the vitamin K forms may influence tissue specificities and their role in human health. However, there is merit for considering both menaquinones and phylloquinone when developing future recommendations for vitamin K intake.
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Abstract
INTRODUCTION The effect of the anti-osteoporosis medicine, menatetrenone (vitamin K(2); menaquinone-4) on the skeleton remains a matter of controversy. The objective of the present review study was to evaluate the effect of menatetrenone on the skeleton of postmenopausal women, men and glucocorticoid-treated patients. METHODS PubMed was used to search the literature for randomized controlled trials (RCTs), meta-analyses and systematic reviews. Thirteen RCTs, one meta-analysis and one systematic review were available for analysis. RESULTS Except for one large Japanese RCT (Phase IV trial: Osteoporotic Fracture (OF) study, n = 4378), RCTs with small sample size showed non-significant or modest effect on bone mineral density (BMD) in postmenopausal women and patients treated with glucocorticoid, positive effect on hip geometry in postmenopausal women and efficacy against fractures (mainly vertebral fractures) in postmenopausal women with osteoporosis. A post hoc analysis of the OF study showed that the incidence of vertebral fractures decreased in postmenopausal women with at least five vertebral fractures. A meta-analysis study, but not a systematic review study, showed efficacy against vertebral and non-vertebral fractures mainly in postmenopausal women with osteoporosis. There was no available evidence for men with osteoporosis. CONCLUSION The present review of the literature revealed some evidence of a positive effect of menatetrenone on the skeleton of postmenopausal women and in patients treated with glucocorticoid. EXPERT OPINION Menatetrenone is considered to be a second-line medicine for postmenopausal osteoporotic women with an increased risk for vertebral fractures.
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Affiliation(s)
- Jun Iwamoto
- Keio University School of Medicine, Institute for Integrated Sports Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan.
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Abstract
Increasing evidence supports an association between the skeleton and energy metabolism. These interactions are mediated by a variety of hormones, cytokines and nutrients. Here, the evidence for a role of osteocalcin in the regulation of glucose metabolism in humans is reviewed. Osteocalcin is a bone matrix protein that regulates hydroxyapatite size and shape through its vitamin-K-dependent, γ-carboxylated form. The concentration of osteocalcin in the circulation is a measure of bone formation. The undercarboxylated form of osteocalcin is active in glucose metabolism in mice. Total serum osteocalcin concentrations in humans are inversely associated with measures of glucose metabolism; however, human data are inconclusive with regard to the role of uncarboxylated osteocalcin in glucose metabolism because most studies do not account for the influence of vitamin K on the proportion of undercarboxylated osteocalcin or differentiate between the total and uncarboxylated forms of osteocalcin. Furthermore, most human studies do not concomitantly measure other bone turnover markers to isolate the role of osteocalcin as a measure of bone formation from its effect on glucose metabolism. Carefully designed studies are required to define the role of osteocalcin and its carboxylated or undercarboxylated forms in the regulation of glucose metabolism in humans.
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Affiliation(s)
- Sarah L Booth
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, USA.
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Sato T, Schurgers LJ, Uenishi K. Comparison of menaquinone-4 and menaquinone-7 bioavailability in healthy women. Nutr J 2012; 11:93. [PMID: 23140417 PMCID: PMC3502319 DOI: 10.1186/1475-2891-11-93] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Accepted: 11/03/2012] [Indexed: 02/07/2023] Open
Abstract
Background Vitamin K2 contributes to bone and cardiovascular health. Therefore, two vitamin K2 homologues, menaquinone-4 (MK-4) and menaquinone-7 (MK-7), have been used as nutrients by the food industry and as nutritional supplements to support bone and cardiovascular health. However, little is known about the bioavailability of nutritional MK-4. To investigate MK-4 and MK-7 bioavailability, nutritional doses were administered to healthy Japanese women. Findings Single dose administration of MK-4 (420 μg; 945 nmol) or MK-7 (420 μg; 647 nmol) was given in the morning together with standardized breakfast. MK-7 was well absorbed and reached maximal serum level at 6 h after intake and was detected up to 48 h after intake. MK-4 was not detectable in the serum of all subjects at any time point. Consecutive administration of MK-4 (60 μg; 135 nmol) or MK-7 (60 μg; 92 nmol) for 7 days demonstrated that MK-4 supplementation did not increase serum MK-4 levels. However, consecutive administration of MK-7 increased serum MK-7 levels significantly in all subjects. Conclusions We conclude that MK-4 present in food does not contribute to the vitamin K status as measured by serum vitamin K levels. MK-7, however significantly increases serum MK-7 levels and therefore may be of particular importance for extrahepatic tissues.
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Affiliation(s)
- Toshiro Sato
- Fine Chemical Laboratory, J-OIL MILLS, INC, 1746 Nakashinden, Fukuroi-city, Shizuoka, 437-1111, Japan.
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Matsumoto T, Miyakawa T, Yamamoto D. Effects of vitamin K on the morphometric and material properties of bone in the tibiae of growing rats. Metabolism 2012; 61:407-14. [PMID: 21944271 DOI: 10.1016/j.metabol.2011.07.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2011] [Revised: 07/28/2011] [Accepted: 07/28/2011] [Indexed: 12/30/2022]
Abstract
Suboptimal vitamin K nutriture is evident during rapid growth. We aimed to determine whether vitamin K(2) (menaquinone-4 [MK-4]) supplementation is beneficial to bone structure and intrinsic bone tissue properties in growing rats. Male Wistar rats (5 weeks old) were assigned to either a control diet (n = 8) or an MK-4-supplemented diet (22 mg d(-1) kg(-1) body weight, n = 8). After a 9-week feeding period, we determined the serum concentration ratio of undercarboxylated osteocalcin to γ-carboxylated osteocalcin and the urinary deoxypyridinoline level. All rats were then euthanized, and their tibiae were analyzed by micro-computed tomography for trabecular architecture and synchrotron radiation micro-computed tomography for cortical pore structure and mineralization. Fourier transform infrared microspectroscopy and a nanoindentation test were performed on the cortical midlayers of the anterior and posterior cortices to assess bone tissue properties. Neither body weight nor tibia length differed significantly between the 2 groups. Dietary MK-4 supplementation decreased the ratio of undercarboxylated osteocalcin to γ-carboxylated osteocalcin but did not affect deoxypyridinoline, indicating a positive effect on bone formation but not bone resorption. Trabecular volume fraction and thickness were increased by MK-4 (P < .05). Neither the cortical pore structure nor mineralization was affected by MK-4. On the other hand, MK-4 increased mineral crystallinity, collagen maturity, and hardness in both the anterior and posterior cortices (P < .05). These data indicate the potential benefit of MK-4 supplementation during growth in terms of enhancing bone quality.
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Affiliation(s)
- Takeshi Matsumoto
- Bioengineering Division, Osaka University Graduate School of Engineering Science, Machikaneyama-cho 1-3, Toyonaka 560-8531, Japan.
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Low-dose menaquinone-7 supplementation improved extra-hepatic vitamin K status, but had no effect on thrombin generation in healthy subjects. Br J Nutr 2012; 108:1652-7. [DOI: 10.1017/s0007114511007185] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Vitamin K is required for the carboxylation of Gla-proteins in the liver (coagulation factors) and extra-hepatic tissues, such as bone (osteocalcin, OC), and arterial wall (matrix Gla-protein, MGP). Although the coagulation factors are essentially fully carboxylated under normal conditions, 10–40 % of OC and MGP remains undercarboxylated. We were therefore interested to study the dose–response effects of extra intake of menaquinones on the carboxylation of the extra-hepatic Gla-proteins. A total of forty-two healthy Dutch men and women aged between 18 and 45 years were randomised into seven groups to receive: placebo capsules or menaquinone-7 (MK-7) capsules at a daily dose of 10, 20, 45, 90, 180 or 360 μg. Circulating uncarboxylated OC (ucOC), carboxylated OC (cOC) and desphospho-uncarboxylated MGP were measured by ELISA. The ucOC:cOC ratio was calculated from circulating ucOC and cOC values. Endogenous thrombin potential and peak height were determined by calibrated automated thrombography. To increase the statistical power, we collapsed the treatment groups into three dosage groups: placebo, low-dose supplementation (doses below RDA, Commission Directive 2008/100/EC), and high-dose supplementation (doses around RDA, Commission Directive 2008/100/EC). MK-7 supplementation at doses in the order of the RDA (Commission Directive 2008/100/EC) increased the carboxylation of circulating OC and MGP. No adverse effects on thrombin generation were observed. Extra MK-7 intake at nutritional doses around the RDA (Commission Directive 2008/100/EC) improved the carboxylation of the extra-hepatic vitamin K-dependent proteins. Whether this improvement contributes to public health, i.e. increasing the protection against age-related diseases needs further investigation in specifically designed intervention trials.
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Pucaj K, Rasmussen H, Møller M, Preston T. Safety and toxicological evaluation of a synthetic vitamin K2, menaquinone-7. Toxicol Mech Methods 2011; 21:520-32. [PMID: 21781006 PMCID: PMC3172146 DOI: 10.3109/15376516.2011.568983] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Menaquinone-7 (MK-7) is part of a family of vitamin K that are essential co-factors for the enzyme γ-glutamyl carboxylase, which is involved in the activation of γ-carboxy glutamate (Gla) proteins in the body. Gla proteins are important for normal blood coagulation and normality of bones and arteries. The objective of this study was to examine the potential toxicity of synthetic MK-7 in BomTac:NMRI mice and in Sprague-Dawley rats. In an acute oral toxicity test, mice were administered a single oral dose of 2000 mg/kg body weight (limit dose) and no toxicity was observed during the 14-day observation period. In the subchronic oral toxicity test in rats, animals were administered MK-7 for 90 days by gavage at the following doses: 0 (vehicle control, corn oil), 2.5, 5, and 10 mg/kg body weight/day. All generated data, including clinical observations, ophthalmology, clinical pathology, gross necropsy, and histopathology, revealed no compound-related toxicity in rats. Any statistically significant findings in clinical pathology parameters and/or organ weights noted were considered to be within normal biological variability. Therefore, under the conditions of this experiment, the median lethal dose (LD50) of MK-7 after a single oral administration in mice was determined to be greater than the limit dose level of 2000 mg/kg body weight. The no observed adverse effect level (NOAEL) of MK-7, when administered orally to rats for 90 days, was considered to be equal to 10 mg/kg body weight/day, the highest dose tested, based on lack of toxicity during the 90-day study period.
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van Hylckama Vlieg JET, Veiga P, Zhang C, Derrien M, Zhao L. Impact of microbial transformation of food on health - from fermented foods to fermentation in the gastro-intestinal tract. Curr Opin Biotechnol 2011; 22:211-9. [PMID: 21247750 DOI: 10.1016/j.copbio.2010.12.004] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2010] [Revised: 12/11/2010] [Accepted: 12/13/2010] [Indexed: 02/07/2023]
Abstract
Fermentation of food components by microbes occurs both during certain food production processes and in the gastro-intestinal tract. In these processes specific compounds are produced that originate from either biotransformation reactions or biosynthesis, and that can affect the health of the consumer. In this review, we summarize recent advances highlighting the potential to improve the nutritional status of a fermented food by rational choice of food-fermenting microbes. The vast numbers of microbes residing in the human gut, the gut microbiota, also give rise to a broad array of health-active molecules. Diet and functional foods are important modulators of the gut microbiota activity that can be applied to improve host health. A truly multidisciplinary approach is required to increase our understanding of the molecular mechanisms underlying health beneficial effects that arise from the interaction of diet, microbes and the human body.
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Dougherty KA, Schall JI, Stallings VA. Suboptimal vitamin K status despite supplementation in children and young adults with cystic fibrosis. Am J Clin Nutr 2010; 92:660-7. [PMID: 20554788 PMCID: PMC2921538 DOI: 10.3945/ajcn.2010.29350] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2010] [Accepted: 05/18/2010] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND For children and adolescents with cystic fibrosis (CF) and pancreatic insufficiency, the efficacy of routine vitamin K supplementation to normalize vitamin K status remains unclear. OBJECTIVE This study examined and determined predictors of vitamin K status in subjects aged 8-25 y with CF and pancreatic insufficiency taking various vitamin K supplements. DESIGN In 97 subjects, serum 25-hydroxyvitamin D [25(OH)D], dietary intake, vitamin K supplement intake, and vitamin K statusmdashdetermined on the basis of the percentage of serum undercarboxylated osteocalcin (%ucOC; sufficient: lt 20%) and plasma proteins induced by vitamin K absence-factor II (PIVKA-II; n = 60; sufficient: le 2 microg/L)mdashwere assessed. The vitamin K supplementation groups were as follows: lt 150 microg/d (low; multivitamins or no supplement), 150-999 microg/d (middle; CF-specific vitamins), and ge 1000 microg/d (high; mephyton). %ucOC values were compared with 140 healthy subjects aged 6-21 y. RESULTS In subjects with CF, the median (range) %ucOC was 35% (3%, 76%) and the median (range) for PIVKA-II was 2 (0, 42) micro g/L. Subjects with CF had a higher %ucOC with low [45% (10%, 76%)] and medium [41% (3%, 66%)] supplement intakes but not with a high supplement intake [16% (4%, 72%)] compared with healthy subjects [23% (0%, 43%); both P lt 0.05]. Supplementation group for males and females and 25(OH)D and age for males were significant predictors of vitamin K status. CONCLUSIONS Vitamin K status was often suboptimal despite routine supplementation. Only subjects taking high-dose vitamin K achieved a status similar to healthy subjects, and only the vitamin K supplementation dose predicted vitamin K status for males and females. These data suggest that higher doses of vitamin K are required.
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Affiliation(s)
- Kelly A Dougherty
- Department of Pediatrics, Children's Hospital of Philadelphia, PA 19104, USA.
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Marques TM, Wall R, Ross RP, Fitzgerald GF, Ryan CA, Stanton C. Programming infant gut microbiota: influence of dietary and environmental factors. Curr Opin Biotechnol 2010; 21:149-56. [PMID: 20434324 DOI: 10.1016/j.copbio.2010.03.020] [Citation(s) in RCA: 180] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2010] [Revised: 03/29/2010] [Accepted: 03/31/2010] [Indexed: 02/06/2023]
Abstract
The neonatal period is crucial for intestinal colonisation, and the composition of this ecosystem in early life is influenced by such factors as mode of birth, environment, diet and antibiotics. The intestinal microbiota contributes to protection against pathogens, maturation of the immune system and metabolic welfare of the host, but under some circumstances can contribute to the pathogenesis of certain diseases. Because colonisation with non-pathogenic microbiota is important for infant health and may affect health in later life, it is important to understand how the composition of this microbial organ is established and by which dietary means (e.g. supplementation with prebiotics/probiotics/food ingredients) it can be programmed in order to achieve an ecosystem that is valuable for the host.
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