scholarly journals Biological Role of Vitamin K—With Particular Emphasis on Cardiovascular and Renal Aspects

Nutrients ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 262
Author(s):  
Anna Stępień ◽  
Małgorzata Koziarska-Rościszewska ◽  
Jacek Rysz ◽  
Mariusz Stępień
Keyword(s):  
Chronic Kidney Disease ◽  
Cardiovascular Risk ◽  
Vitamin K ◽  
Cardiovascular Events ◽  
Potent Inhibitor ◽  
Anticoagulation Therapy ◽  
The Body ◽  
Matrix Gla Protein ◽  
The Impact

Vitamin K (VK) plays many important functions in the body. The most important of them include the contribution in calcium homeostasis and anticoagulation. Vascular calcification (VC) is one of the most important mechanisms of renal pathology. The most potent inhibitor of this process—matrix Gla protein (MGP) is VK-dependent. Chronic kidney disease (CKD) patients, both non-dialysed and hemodialysed, often have VK deficiency. Elevated uncarboxylated matrix Gla protein (ucMGP) levels indirectly reflected VK deficiency and are associated with a higher risk of cardiovascular events in these patients. It has been suggested that VK intake may reduce the VC and related cardiovascular risk. Vitamin K intake has been suggested to reduce VC and the associated cardiovascular risk. The role and possibility of VK supplementation as well as the impact of anticoagulation therapy on VK deficiency in CKD patients is discussed.

scholarly journals The Vitamin K Metabolome in Chronic Kidney Disease

Nutrients ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 1076 ◽  
Author(s):  
Mandy Turner ◽  
Michael Adams ◽  
Rachel Holden
Keyword(s):  
Chronic Kidney Disease ◽  
Kidney Disease ◽  
Vitamin K ◽  
Cardiovascular Events ◽  
Vitamin K Deficiency ◽  
Ectopic Mineralization ◽  
K Deficiency ◽  
Activity Of Enzymes ◽  
The Impact ◽  
Tissue Vitamin

The purpose of this review is to summarize the research to date on the impact of chronic kidney disease (CKD) on the vitamin K metabolome. Vitamin K-dependent proteins contribute to cardiovascular disease (CVD) prevention via the prevention of ectopic mineralization. Sub-clinical vitamin K deficiency is common in CKD patients, and evidence suggests that it may contribute to the CVD burden in this population. Research from animal models suggests that CKD alters tissue measures of the two predominant forms of vitamin K: KI and MK-4. The expression and/or activity of enzymes that regulate the recycling of vitamin K and the carboxylation of vitamin K-dependent proteins also appear to be altered in CKD. Evidence suggests that statins, a common pharmaceutical prescribed to CKD patients to prevent cardiovascular events, may impact the metabolism of vitamin K and therefore contribute to its relative inefficiency at preventing CVD in this population as kidney disease progresses. Human research on the tissue vitamin K metabolome in CKD patients is lacking.

Exploring the role of excess fluoride in chronic kidney disease: A review

2018 ◽  
Vol 38 (3) ◽  
pp. 269-279 ◽  
Author(s):  
RW Dharmaratne
Keyword(s):  
Chronic Kidney Disease ◽  
Kidney Disease ◽  
Adverse Effects ◽  
Soft Tissues ◽  
Human Kidney ◽  
Kidney Damage ◽  
The Body ◽  
Excessive Consumption ◽  
The Impact

This review covers nearly 100 years of studies on the toxicity of fluoride on human and animal kidneys. These studies reveal that there are direct adverse effects on the kidneys by excess fluoride, leading to kidney damage and dysfunction. With the exception of the pineal gland, the kidney is exposed to higher concentrations of fluoride than all other soft tissues. Therefore, exposure to higher concentrations of fluoride could contribute to kidney damage, ultimately leading to chronic kidney disease (CKD). Among major adverse effects on the kidneys from excessive consumption of fluoride are immediate effects on the tubular area of the kidneys, inhibiting the tubular reabsorption; changes in urinary ion excretion by the kidneys disruption of collagen biosynthesis in the body, causing damages to the kidneys and other organs; and inhibition of kidney enzymes, affecting the functioning of enzyme pathways. This review proposes that there is a direct correlation between CKD and the consumption of excess amounts of fluoride. Studies particularly show immediate adverse effects on the tubular area of human and animal kidneys leading to CKD due to the consumption of excess fluoride. Therefore, it is very important to conduct more investigations on toxicity studies of excess fluoride on the human kidney, including experiments using human kidney enzymes, to study more in depth the impact of excess fluoride on the human kidney. Further, the interference of excess fluoride on collagen synthesis in human body and its effect on human kidney should also be further investigated.

scholarly journals Vascular Calcification in Chronic Kidney Disease: The Role of Vitamin K- Dependent Matrix Gla Protein

2020 ◽  
Vol 7 ◽  
Author(s):  
Stefanos Roumeliotis ◽  
Evangelia Dounousi ◽  
Marios Salmas ◽  
Theodoros Eleftheriadis ◽  
Vassilios Liakopoulos
Keyword(s):  
Chronic Kidney Disease ◽  
Kidney Disease ◽  
Vascular Calcification ◽  
Vitamin K ◽  
Matrix Gla Protein

scholarly journals The increased risk of cardiovascular events in chronic kidney disease: pathogenetic mechanisms, the possibility of correction

2014 ◽  
Vol 5 (3-4) ◽  
pp. 54-60
Author(s):  
O. Yu Barysheva ◽  
A. A Melentieva ◽  
L. M Kheyfetz ◽  
A. T Balashov
Keyword(s):  
Chronic Kidney Disease ◽  
Cardiovascular Risk ◽  
Growth Factor ◽  
Kidney Disease ◽  
Cardiovascular Events ◽  
Fibroblast Growth Factor 23 ◽  
Fibroblast Growth ◽  
Pathogenetic Mechanisms ◽  
Increased Risk

The paper discusses the pathogenetic mechanisms linking cardiovascular risk and chronic kidney disease (CKD). Presents data on the role of hypercalcemia, hyperphosphatemia, secondary hyperparathyroidism, fibroblast growth factor-23, Klotho, an important the components of the pathogenesis of mineral and bone disorders increase the risk cardiovascular events in CKD. Discussed the causes and features dyslipidemia in CKD, particularly correction. Presents data on options calciphylaxis, causes, development, peculiarities of treatment.

scholarly journals Erythrocytes: Central Actors in Multiple Scenes of Atherosclerosis

2021 ◽  
Vol 22 (11) ◽  
pp. 5843
Author(s):  
Chloé Turpin ◽  
Aurélie Catan ◽  
Olivier Meilhac ◽  
Emmanuel Bourdon ◽  
François Canonne-Hergaux ◽  
...  
Keyword(s):  
Iron Homeostasis ◽  
The Body ◽  
Diabetic Patients ◽  
Special Focus ◽  
Plaque Progression ◽  
Cell Dysfunction ◽  
Circulating Cells ◽  
The Impact ◽  
Progression Of Atherosclerosis

The development and progression of atherosclerosis (ATH) involves lipid accumulation, oxidative stress and both vascular and blood cell dysfunction. Erythrocytes, the main circulating cells in the body, exert determinant roles in the gas transport between tissues. Erythrocytes have long been considered as simple bystanders in cardiovascular diseases, including ATH. This review highlights recent knowledge concerning the role of erythrocytes being more than just passive gas carriers, as potent contributors to atherosclerotic plaque progression. Erythrocyte physiology and ATH pathology is first described. Then, a specific chapter delineates the numerous links between erythrocytes and atherogenesis. In particular, we discuss the impact of extravasated erythrocytes in plaque iron homeostasis with potential pathological consequences. Hyperglycaemia is recognised as a significant aggravating contributor to the development of ATH. Then, a special focus is made on glycoxidative modifications of erythrocytes and their role in ATH. This chapter includes recent data proposing glycoxidised erythrocytes as putative contributors to enhanced atherothrombosis in diabetic patients.

scholarly journals Role of Matrix Gla Protein in the Complex Network of Coronary Artery Disease: A Comprehensive Review

Life ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 737
Author(s):  
Marko Kumric ◽  
Josip A. Borovac ◽  
Tina Ticinovic Kurir ◽  
Dinko Martinovic ◽  
Ivan Frka Separovic ◽  
...  
Keyword(s):  
Coronary Artery Disease ◽  
Coronary Artery ◽  
Complex Network ◽  
Vascular Calcification ◽  
Vitamin K ◽  
Clinical Decision Making ◽  
Large Body ◽  
Matrix Gla Protein ◽  
Artery Disease

Coronary artery disease (CAD) is widely recognized as one of the most important clinical entities. In recent years, a large body of accumulated data suggest that coronary artery calcification, a process highly prevalent in patients with CAD, occurs via well-organized biologic processes, rather than passively, as previously regarded. Matrix Gla protein (MGP), a vitamin K-dependent protein, emerged as an important inhibitor of both intimal and medial vascular calcification. The functionality of MGP hinges on two post-translational modifications: phosphorylation and carboxylation. Depending on the above-noted modifications, various species of MGP may exist in circulation, each with their respective level of functionality. Emerging data suggest that dysfunctional species of MGP, markedly, dephosphorylated-uncarboxylated MGP, might find its application as biomarkers of microvascular health, and assist in clinical decision making with regard to initiation of vitamin K supplementation. Hence, in this review we summarized the current knowledge with respect to the role of MGP in the complex network of vascular calcification with concurrent inferences to CAD. In addition, we discussed the effects of warfarin use on MGP functionality, with concomitant implications to coronary plaque stability.

scholarly journals The confidence delusion: A sociological exploration of participants’ confidence in sport-for-development

2018 ◽  
Vol 55 (4) ◽  
pp. 383-398
Author(s):  
David S Scott
Keyword(s):  
Personal Development ◽  
The Body ◽  
Individual Interviews ◽  
Everyday Lives ◽  
Sport For Development ◽  
Development Capacity ◽  
The Social ◽  
Ethnographic Methodology ◽  
The Impact

Although sport is widely utilised as a tool for personal development, capacity building, and fostering peace, there are still numerous theoretical gaps in our knowledge about how sport influences individuals’ identities, and how this translates into their everyday lives. Within the academic literature there has been seemingly little focus placed upon participants’ emotional and embodied accounts of their sport-for-development (SfD) experiences. This paper uses phenomenologically-inspired theory to explore individuals’ lived experiences of a SfD course, and their descriptions of the social interactions and feelings of confidence they encountered, in order to address this lack of experiential data. An ethnographic methodology was used to collect data through four sports leadership course observations, and cyclical interviews over 4–10 months with eleven course attendees, plus individual interviews with five tutors. Participants’ understandings of their course experiences and the subsequent influence these understandings had on their lives were described through their use of the term confidence. A further phenomenological and sociological interrogation of this term enabled confidence to be seen as being experienced as a ‘frame’ and ‘through the body’ by participants. This study provides original conceptualisations of confidence in relation to participants’ SfD experiences, as well as important discussions regarding the role of emotions and embodiment in understanding the impact of SfD on participants’ everyday lives.

scholarly journals Genetic and Non-Genetic Factors Association with Warfarin Long Term Therapy Stability in Sudan

2016 ◽  
Vol 8 (4) ◽  
pp. 100
Author(s):  
Azza A. M. H. Swar Aldahab ◽  
Abdallah. O. Elkhawad
Keyword(s):  
Vitamin K ◽  
Genetic Factors ◽  
Warfarin Therapy ◽  
Anticoagulation Therapy ◽  
Warfarin Dose ◽  
Term Therapy ◽  
P Value ◽  
Retrospective Case ◽  
The Impact

Anticoagulation with warfarin is characterized by a wide inter-individual variations in dose requirements and INR (International Normalised Ratio) stability, as there are evidences that warfarin response variability is associated with CYP2C9 (cytochrome P450, family 2, subfamily C, polypeptide 9) and VKORC1 (Vitamin K epoxide reductase complex1) genetic polymorphisms. Carriers of CYP2C9*2 and VKORC11639G>A variant alleles are at greater risk of unstable anticoagulation therapy. Objectives: This retrospective case control study was directed to analyze the impact of genetic and non-genetic factors on warfarin therapy in Sudanese out-patients who were on long term warfarin therapy. Method: 118 Sudanese outpatients receiving warfarin treatment for at least six months, were interviewed for their non-genetic factors that included age, sex, indication for warfarin therapy, compliance, Vitamin K rich foods intake and concomitant drug therapy, in addition to their blood samples which were taken for DNA extraction and genotyping of CYP2C9*2 and VKORC11639G>A gene polymorphisms to study the genetic factors. INR stability % index was calculated, accordingly patients were classified into 2 groups, stable and unstable groups. Results: The frequencies of VKORC11639G>A alleles in Sudanese out-patients who were on long term warfarin therapy were 70.3% and 29.7% for the VKORC1/G and VKORC1/A alleles respectively. The frequencies of CYP2C9*2 alleles in Sudanese out-patients were 92.4% and 7.6% for CYP2C9*1 and CYP2C9*2 alleles respectively. Variables associated with low INR stability were VKCOR1/AA genotype (p-value = 0.028) and sex (p = 0.017). Variables that showed no association with INR stability were age (p-value = 0.259), compliance (p-value = 0.058). Vitamin K rich foods intake (p- value = 0.743), and mean stable warfarin dose (p-value = 0.439). Conclusion: Polymorphism in warfarin drug target gene VKORC1-11639G>A and sex are important elements of INR stability in Sudanese out- patients on long term warfarin therapy.

P1645VITAMIN K DEPENDENT PROTEINS AFTER KIDNEY TRANSPLANTATION: RESULTS FROM PROSPECTIVE STUDY

2020 ◽  
Vol 35 (Supplement_3) ◽  
Author(s):  
Maria Fusaro ◽  
Pascale Khairallah ◽  
Andrea Aghi ◽  
Mario Plebani ◽  
Martina Zaninotto ◽  
...  
Keyword(s):  
Kidney Transplantation ◽  
Prospective Study ◽  
Vascular Calcification ◽  
Vitamin K ◽  
Matrix Gla Protein ◽  
Bone Gla Protein ◽  
Vitamin K Deficiency ◽  
Prospective Data ◽  
K Deficiency ◽  
The Impact

Abstract Background and Aims Two Vitamin K-dependent proteins (VDKPs) link bone and vasculature in CKD-MBD: Bone Gla Protein (BGP) and Matrix Gla Protein (MGP). In ESKD, Vitamin K deficiency is highly prevalent and leads to increased levels of inactive VKDPs (undercaboxylated (ucBGP and dephosphorylated (dp)-uMGP), which are linked to greater risk of fractures and severity of vascular calcification. We hypothesized that kidney transplantation (KT) would improve Vitamin K status and lower levels of inactive VKDPs. Method Between 2014-2017, we conducted a study in 34 patients to assess changes in VKDPs during the 1st year of KT. In a specialized lab we determined VKDPs pre- and 1-year post-KT: total BGP, uc BGP, total MGP, and dp-uc MGP. We determined the prevalence of Vitamin K deficiency based on levels of uc BGP and dp-uc MGP. Results Our cohort had a mean +/- SD age of 48+/-14 years, 32% were female and 97% were Caucasian. 1 year post-KT, there was a decrease in the levels of all VKDPs and the prevalence of Vitamin K deficiency (Table 1 and Figure 1). Patients with greatest severity of Vitamin K deficiency pre-KT had the largest decreases of inactive VDKPs post-KT. Conclusion KT was associated with improvement in Vitamin K status as manifested by decreased levels of inactive VKDPs. These are the first prospective data on VKDPs in CKD patients pre- and post-KT. Studies are needed to assess the impact of improvement in VKDP status after KT on CKD-MBD outcomes.

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