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vitamin k and calcification

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https://www.readbyqxmd.com/read/28065270/functional-study-of-the-vitamin-k-cycle-enzymes-in-live-cells
#1
J-K Tie, D W Stafford
Vitamin K-dependent carboxylation, an essential posttranslational modification catalyzed by gamma-glutamyl carboxylase, is required for the biological functions of proteins that control blood coagulation, vascular calcification, bone metabolism, and other important physiological processes. Concomitant with carboxylation, reduced vitamin K (KH2) is oxidized to vitamin K epoxide (KO). KO must be recycled back to KH2 by the enzymes vitamin K epoxide reductase and vitamin K reductase in a pathway known as the vitamin K cycle...
2017: Methods in Enzymology
https://www.readbyqxmd.com/read/28049648/vitamin-k-dependent-carboxylation-of-matrix-gla-protein-influences-the-risk-of-calciphylaxis
#2
Sagar U Nigwekar, Donald B Bloch, Rosalynn M Nazarian, Cees Vermeer, Sarah L Booth, Dihua Xu, Ravi I Thadhani, Rajeev Malhotra
Matrix Gla protein (MGP) is a potent inhibitor of vascular calcification. The ability of MGP to inhibit calcification requires the activity of a vitamin K-dependent enzyme, which mediates MGP carboxylation. We investigated how MGP carboxylation influences the risk of calciphylaxis in adult patients receiving dialysis and examined the effects of vitamin K deficiency on MGP carboxylation. Our study included 20 patients receiving hemodialysis with calciphylaxis (cases) and 20 patients receiving hemodialysis without calciphylaxis (controls) matched for age, sex, race, and warfarin use...
January 3, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/28036114/does-statins-promote-vascular-calcification-in-chronic-kidney-disease
#3
Zhimin Chen, Abdul Rashid Qureshi, Paolo Parini, Eva Hurt-Camejo, Jonaz Ripsweden, Torkel B Brismar, Peter Barany, Armand Jaminon, Leon J Schurgers, Olof Heimburger, Bengt Lindholm, Peter Stenvinkel
BACKGROUND: In end-stage renal disease (ESRD), coronary artery calcification (CAC) and inflammation contribute to cardiovascular disease (CVD). Statins do not improve survival in ESRD patients and their effect on vascular calcification is unclear. We explored associations between CAC, inflammatory biomarkers, statins and mortality in ESRD. MATERIAL AND METHODS: In 240 ESRD patients (63% males; median age 56 years) from cohorts including 86 recipients of living donor kidney transplant (LD-Rtx), 96 incident dialysis patients and 58 prevalent peritoneal dialysis patients, associations of CAC score (Agatston Units, AUs), interleukin-6 (IL-6) with high-sensitivity C-reactive protein (hsCRP), tumour necrosis factor (TNF), use of statins and all-cause mortality were analysed...
December 30, 2016: European Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28027627/association-of-vitamin-d-deficiency-with-cardiovascular-disease-risk-in-children-implications-for-the-asia-pacific-region
#4
Indah K Murni, Dian C Sulistyoningrum, Vicka Oktaria
BACKGROUND AND OBJECTIVES: Vitamin D deficiency significantly affects cardiovascular disease risk. Cardiovascular disease is epidemic in nature. Because the prevalence of cardiovascular disease has been increasing in children, it has been changing from an adulthood disease to a childhood disease. Therefore, formulating an effective prevention strategy against cardiovascular disease development in children is crucial. METHODS AND STUDY DESIGN: From PubMed, we identified and reviewed studies evaluating the association of vitamin D deficiency with cardiovascular disease risk in children...
December 2016: Asia Pacific Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/27951533/correlations-of-plasma-desphosphorylated-uncarboxylated-matrix-gla-protein-with-vascular-calcification-and-vascular-stiffness-in-chronic-kidney-disease
#5
Sipanan Thamratnopkoon, Paweena Susantitaphong, Monravee Tumkosit, Pisut Katavetin, Khajohn Tiranathanagul, Kearkiat Praditpornsilpa, Somchai Eiam-Ong
BACKGROUND: Matrix Gla protein (MGP) is a potent inhibitor of vascular calcification and needs vitamin K-dependent carboxylation for its activity. High levels of desphosphorylated uncarboxylated MGP (dp-ucMGP) were significantly associated with vitamin K deficiency and vascular calcification. This study was conducted to explore the correlations of plasma dp-ucMGP with vascular calcification and vascular stiffness in chronic kidney disease (CKD) patients. METHODS: This cross-sectional study enrolled 83 CKD stages 3-5 patients...
December 13, 2016: Nephron
https://www.readbyqxmd.com/read/27927630/inactive-matrix-gla-protein-and-arterial-stiffness-in-type-2-diabetes-mellitus
#6
Mayank Sardana, Izzah Vasim, Swapna Varakantam, Uzma Kewan, Ali Tariq, Maheshwara R Koppula, Amer Ahmed Syed, Melissa Beraun, Nadja E A Drummen, Cees Vermeer, Scott R Akers, Julio A Chirinos
BACKGROUND: Large artery stiffness is increased in diabetes mellitus and causes an excessive pulsatile load to the heart and to the microvasculature. The identification of pathways related to arterial stiffness may provide novel therapeutic targets to ameliorate arterial stiffness in diabetes. Matrix Gla-Protein (MGP) is an inhibitor of vascular calcification. Activation of MGP is vitamin K dependent. We hypothesized that levels of inactive MGP (dephospho-uncarboxylated MGP; dp-ucMGP) are related to arterial stiffness in type 2 diabetes...
December 7, 2016: American Journal of Hypertension
https://www.readbyqxmd.com/read/27819733/research-article-molecular-cloning-and-expression-analysis-of-a-matrix-gla-protein-gene-in-the-spinyhead-croaker-collichthys-lucidus
#7
W Song, M D Zhao, K J Jiang, F Y Zhang, M Zhao, Y Y Meng, L B Ma
The matrix Gla (gamma-carboxyglutamic acid-rich) protein (MGP), a vitamin K-dependent and Gla-containing protein, is a calcification inhibitor that mainly functions in tissue calcification and mineralization. In this study, we obtained the complete cDNA sequence of MGP from the spinyhead croaker (Collichthys lucidus), which we named Cl-MGP. Cl-MGP was 923 bp long with a 384-bp open reading fragment that encoded 127 amino acids. The predicted MGP protein sequence contained a 19-residue hydrophobic signal peptide, suggesting that it possesses secretory characteristics...
November 3, 2016: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/27752480/vitamin-k-dependent-protection-of-the-renal-microvasculature-histopathological-studies-in-normal-and-diseased-kidneys
#8
Fang-Fei Wei, Nadja E A Drummen, Lutgarde Thijs, Lotte Jacobs, Marjolein Herfs, Cynthia Van't Hoofd, Cees Vermeer, Jan A Staessen
Vitamin-K-dependent carboxylation of matrix Gla protein (MGP) protects the macrocirculation against calcification. We recently reported in a multiethnic population study that the estimated glomerular filtration rate, a microvascular trait, decreased and the risk of chronic kidney disease increased with higher circulating levels of inactive dephospho-uncarboxylated MGP, a marker of vitamin K deficiency. These findings highlighted the possibility that vitamin K might have a beneficial effect on the renal microcirculation...
September 2016: Pulse (Basel, Switzerland)
https://www.readbyqxmd.com/read/27751997/vkorc1-gene-vitamin-k-epoxide-reductase-polymorphisms-are-associated-with-cardiovascular-disease-in-chronic-kidney-disease-patients-on-hemodialysis
#9
Noha A Osman, Nevine El-Abd, Mohamed Nasrallah
Vitamin K is necessary for the carboxylation of clotting factors and matrix Gla protein (MGP). Vitamin K epoxide reductase (VKOR) is the enzyme responsible for recirculation of Vitamin K increasing its tissue availability. Polymorphisms of VKOR may alter the function of MGP, thereby influencing vascular calcification. We conducted this study to investigate the relationship of VKORC1 gene single nucleotide polymorphisms (SNP's) to vascular calcification and clinically overt cardiovascular disease in chronic kidney disease (CKD) patients on hemodialysis (HD)...
September 2016: Saudi Journal of Kidney Diseases and Transplantation
https://www.readbyqxmd.com/read/27595517/cardiovascular-calcifications-in-chronic-kidney-disease-potential-therapeutic-implications
#10
Jordi Bover, Pablo Ureña-Torres, José Luis Górriz, María Jesús Lloret, Iara da Silva, César Ruiz-García, Pamela Chang, Mariano Rodríguez, José Ballarín
Cardiovascular (CV) calcification is a highly prevalent condition at all stages of chronic kidney disease (CKD) and is directly associated with increased CV and global morbidity and mortality. In the first part of this review, we have shown that CV calcifications represent an important part of the CKD-MBD complex and are a superior predictor of clinical outcomes in our patients. However, it is also necessary to demonstrate that CV calcification is a modifiable risk factor including the possibility of decreasing (or at least not aggravating) its progression with iatrogenic manoeuvres...
November 2016: Nefrología: Publicación Oficial de la Sociedad Española Nefrologia
https://www.readbyqxmd.com/read/27547048/matrix-gla-protein-in-tumoral-pathology
#11
REVIEW
Simona Roxana Gheorghe, Alexandra Mărioara Crăciun
Matrix Gla protein is a vitamin K-dependent protein secreted by chondrocytes and vascular smooth muscle cells. The presence of matrix Gla protein was reported in arterial and venous walls, lungs, kidney, uterus, heart, tooth cementum and eyes. Several studies identified matrix Gla protein in tumoral pathology. Until recently, it was thought to only have an inhibitory role of physiological and ectopic calcification. New studies demonstrated that it also has a role in physiological and pathological angiogenesis, as well as in tumorigenesis...
2016: Clujul Medical (1957)
https://www.readbyqxmd.com/read/27515210/hypothesis-phytate-is-an-important-unrecognised-nutrient-and-potential-intravenous-drug-for-preventing-vascular-calcification
#12
Pieter Joubert, Markus Ketteler, Carolina Salcedo, Joan Perello
Cardiovascular calcification (CVC) associated with conditions such as ageing, diabetes or renal impairment, results from the deposition of hydroxyapatite in the endothelium or media of blood vessels. Key medical management options are directed towards controlling plasma calcium and phosphate concentrations (e.g. parathormone inhibition, phosphate binders, dialysis), enhancing the effect of calcification inhibitors (e.g. fetuin-A, pyrophosphate, vitamin K, osteopontin, matrix Gla protein) and decreasing the effect of promoters of calcification (e...
September 2016: Medical Hypotheses
https://www.readbyqxmd.com/read/27508717/-op-1b-01-vitamin-k-dependent-protection-of-renal-function-in-multi-ethnic-population-studies
#13
F Wei, N E A Drummen, A E Schutte, L Thijs, L Jacobs, T Petit, W Y Yang, W Smith, Z Y Zhang, Y M Gu, T Kuznetsova, P Verhamme, K Allegaert, R Schutte, E Lerut, P Evenepoel, C Vermeer, J A Staessen
OBJECTIVE: Vitamin K (VK) dependent carboxylation of matrix Gla protein (MGP) protects the macrocirculation against calcification. Whether glomerular filtration (GFR), a renal microvascular trait, is related to circulating desphospho-uncarboxylated MGP (dp-ucMGP) has not been explored before. We therefore investigated our hypothesis in our Flemish Study on Environment, Genes and Health Outcomes (FLEMENGHO) and sought replication in the South African Study Regarding the Influence of Sex, Age and Ethnicity on Insulin Sensitivity and Cardiovascular Function (SAfrEIC)...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27508317/circulating-des-gamma-carboxy-prothrombin-is-not-associated-with-cardiovascular-calcification-or-stiffness-the-multi-ethnic-study-of-atherosclerosis-mesa
#14
John Danziger, Rebekah L Young, Kyla M Shea, Daniel A Duprez, David R Jacobs, Russell P Tracy, Joachim H Ix, Nancy S Jenny, Kenneth J Mukamal
BACKGROUND AND AIMS: Vitamin K-dependent protein (VKDP) activity may have a role in preventing cardiovascular calcification, but has not previously been studied in large, generally healthy populations. METHODS: Using an elevated ankle-brachial index (ABI) as a measure of medial vascular calcification, we performed a case-cohort analysis within the Multi-Ethnic Study of Atherosclerosis, measuring Des-gamma-carboxy prothrombin (DCP) to estimate VKDP activity. In secondary analyses of the weighted subcohort, we examined the cross-sectional associations between DCP and prevalent vascular calcification of the coronary vessels, aortic and mitral valves, and aortic wall, and with vascular stiffness...
September 2016: Atherosclerosis
https://www.readbyqxmd.com/read/27494446/the-relationship-between-vitamin-k-and-peripheral-arterial-disease
#15
Linda E T Vissers, Geertje W Dalmeijer, Jolanda M A Boer, W M Monique Verschuren, Yvonne T van der Schouw, Joline W J Beulens
BACKGROUND AND AIMS: A high dietary intake of vitamin K1 (phylloquinone) and vitamin K2 (menaquinones) is thought to decrease cardiovascular disease risk by reducing vascular calcification. The objective of this study is to explore if there is a relationship between phylloquinone and menaquinones intake and risk of PAD. METHODS: We investigated the association between intake of phylloquinone and menaquinones with PAD in a prospective cohort with 36,629 participants...
September 2016: Atherosclerosis
https://www.readbyqxmd.com/read/27437760/effect-of-vitamin-k-in-bone-metabolism-and-vascular-calcification-a-review-of-mechanisms-of-action-and-evidences
#16
Julia Khéde Dourado Villa, Marisa Alves Nogueira Diaz, Virgínia Ramos Pizziolo, Hércia Stampini Duarte Martino
Osteoporosis is a public health concern associated with an increased risk of bone fractures and vascular calcification. Vitamin K presents unique benefits on these issues, although understudied. The two main forms of vitamin K are phylloquinone (vitamin K1) and menaquinone (vitamin K2). In this study, it was especially investigated the action of vitamin K2 in bones and vessels. Vitamin K2 has shown to stimulate bone formation by promoting osteoblast differentiation and carboxylation of osteocalcin, and increasing alkaline phosphatase, insulin-like growth factor-1, growth differentiation factor-15, and stanniocalcin 2 levels...
July 20, 2016: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/27389001/bone-loss-and-vascular-calcification-a-bi-directional-interplay
#17
Cristina Vassalle, Annamaria Mazzone
Vascular calcification (VC) represents a recognized adverse predictor for cardiovascular morbidity and mortality. Previously considered passive and degenerative, VC is now recognized as an active process that resembles bone formation, and shares a number of histopathological features, mineral composition, and initiation mechanisms with bone development and metabolism. Oxidative stress and inflammation are key factors in both VC and osteoporosis (OP). Biochemical factors known to be primarily involved in the healthy bone metabolism also regulate VC...
July 4, 2016: Vascular Pharmacology
https://www.readbyqxmd.com/read/27234935/low-vitamin-k1-intake-in-haemodialysis-patients
#18
Maria Fusaro, Claudia D'Alessandro, Marianna Noale, Giovanni Tripepi, Mario Plebani, Nicola Veronese, Giorgio Iervasi, Sandro Giannini, Maurizio Rossini, Giovanni Tarroni, Sandro Lucatello, Alberto Vianello, Irene Santinello, Luciana Bonfante, Fabrizio Fabris, Stefania Sella, Antonio Piccoli, Agostino Naso, Daniele Ciurlino, Andrea Aghi, Maurizio Gallieni, Adamasco Cupisti
BACKGROUND & AIMS: Vitamin K acts as a coenzyme in the γ-carboxylation of vitamin K-dependent proteins, including coagulation factors, osteocalcin, matrix Gla protein (MGP), and the growth arrest-specific 6 (GAS6) protein. Osteocalcin is a key factor for bone matrix formation. MGP is a local inhibitor of soft tissue calcification. GAS6 activity prevents the apoptosis of vascular smooth muscle cells. Few data on vitamin K intake in chronic kidney disease patients and no data in patients on a Mediterranean diet are available...
April 28, 2016: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/27230889/gas6-protein-its-role-in-cardiovascular-calcification
#19
Nadine Kaesler, Svenja Immendorf, Chun Ouyang, Marjolein Herfs, Nadja Drummen, Peter Carmeliet, Cees Vermeer, Jürgen Floege, Thilo Krüger, Georg Schlieper
BACKGROUND: Cardiovascular calcifications can be prevented by vitamin K and are accelerated by vitamin K antagonists. These effects are believed to be mainly mediated by the vitamin K-dependent matrix Gla protein. Another vitamin K-dependent protein, Gas6, is also expressed in vascular smooth muscle cells (VSMC). In vitro Gas6 expression was shown to be regulated in VSMC calcification and apoptotic processes. METHODS: We investigated the role of Gas6 in vitro using VSMC cultures and in vivo in young and old Gas6-deficient (Gas6(-/-)) and wildtype (WT) mice...
2016: BMC Nephrology
https://www.readbyqxmd.com/read/27203170/-vascular-calcifications-the-hidden-side-effects-of-vitamin-k-antagonists
#20
REVIEW
Youssef Bennis, Subashini Vengadessane, Sandra Bodeau, Valérie Gras, Giampiero Bricca, Saïd Kamel, Sophie Liabeuf
Despite the availability of new oral anticoagulants, vitamin K antagonists (VKA, such as fluindione, acenocoumarol or warfarin) remain currently the goal standard medicines for oral prevention or treatment of thromboembolic disorders. They inhibit the cycle of the vitamin K and its participation in the enzymatic gamma-carboxylation of many proteins. The VKA prevent the activation of the vitamin K-dependent blood clotting factors limiting thus the initiation of the coagulation cascade. But other proteins are vitamin K-dependent and also remain inactive in the presence of VKA...
September 2016: Thérapie
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