scholarly journals A Comprehensive Review on the Biomarkers of Bone Remodeling in Vitamin D Deficiency

2021 ◽  
pp. 280-290
Author(s):  
Krishna Veni Nagappan ◽  
Arti Sureshkumar
Keyword(s):  
Vitamin D ◽  
Bone Remodeling ◽  
Genetic Factors ◽  
Bone Structure ◽  
Bone Mineralization ◽  
Strong Association ◽  
Biological Functions ◽  
Clinical Support ◽  
Health Complications ◽  
And Function

Vitamin D (Vit.D) has been well regarded as one of the essential micronutrients for several biological functions in humans, including bone structure and function. The deficiency of Vit.D due to various environmental, lifestyle, and genetic factors affect bone remodeling, including bone mineralization and resorption. Consequently, several changes occur in the level of biochemicals which are implied in bone remodeling, either directly or via secondary pathways. Intriguingly, the levels of these biomolecules are hypothesized to have a strong association with the prognosis of Vit. D deficiency (VDD) related health complications. However, the precise association of various bone turnover-derived biomolecules with VDD-related effects are largely elusive. Thus, the in-depth understanding of specific associations of VDD and bone mineralization, would establish novel bioanalytical approaches for early detection and devise alternative strategies to provide symptomatic clinical support to VDD patients. Hence this review collates the available literature to elucidate the association of various bone resorption biomarkers and their relevance to VDD.

scholarly journals Regulation and Function of the FGF23/Klotho Endocrine Pathways

2012 ◽  
Vol 92 (1) ◽  
pp. 131-155 ◽  
Author(s):  
Aline Martin ◽  
Valentin David ◽  
L. Darryl Quarles
Keyword(s):  
Vitamin D ◽  
Intestinal Absorption ◽  
Mineral Metabolism ◽  
Bone Mineralization ◽  
Phosphate Homeostasis ◽  
Dihydroxyvitamin D ◽  
1,25 Dihydroxyvitamin D ◽  
Tubular Phosphate Reabsorption ◽  
Renal Tubular ◽  
And Function

Calcium (Ca2+) and phosphate (PO43−) homeostasis are coordinated by systemic and local factors that regulate intestinal absorption, influx and efflux from bone, and kidney excretion and reabsorption of these ions through a complex hormonal network. Traditionally, the parathyroid hormone (PTH)/vitamin D axis provided the conceptual framework to understand mineral metabolism. PTH secreted by the parathyroid gland in response to hypocalcemia functions to maintain serum Ca2+ levels by increasing Ca2+ reabsorption and 1,25-dihydroxyvitamin D [1,25(OH)2D] production by the kidney, enhancing Ca2+ and PO43− intestinal absorption and increasing Ca2+ and PO43− efflux from bone, while maintaining neutral phosphate balance through phosphaturic effects. FGF23 is a recently discovered hormone, predominately produced by osteoblasts/osteocytes, whose major functions are to inhibit renal tubular phosphate reabsorption and suppress circulating 1,25(OH)2D levels by decreasing Cyp27b1-mediated formation and stimulating Cyp24-mediated catabolism of 1,25(OH)2D. FGF23 participates in a new bone/kidney axis that protects the organism from excess vitamin D and coordinates renal PO43− handling with bone mineralization/turnover. Abnormalities of FGF23 production underlie many inherited and acquired disorders of phosphate homeostasis. This review discusses the known and emerging functions of FGF23, its regulation in response to systemic and local signals, as well as the implications of FGF23 in different pathological and physiological contexts.

scholarly journals Divergent effects of sex and calcium/vitamin D supplementation on serum magnesium and markers of bone structure and function during initial military training

2021 ◽  
pp. 1-23
Author(s):  
Stephen R. Hennigar ◽  
Alyssa M. Kelley ◽  
Anna T. Nakayama ◽  
Bradley J. Anderson ◽  
James P. McClung ◽  
...  
Keyword(s):  
Vitamin D ◽  
Bone Health ◽  
Bone Structure ◽  
Serum Magnesium ◽  
Military Training ◽  
Secondary Analysis ◽  
Vitamin D Supplementation ◽  
Military Recruits ◽  
Dietary Magnesium ◽  
And Function

ABSTRACT Maintaining magnesium status may be important for military recruits, a population that experiences high rates of stress fracture during initial military training (IMT). The objectives of this secondary analysis were to 1) compare dietary magnesium intake and serum magnesium in female and male recruits pre- and post- IMT, 2) determine whether serum magnesium was related to parameters of bone health pre-IMT, and 3) whether calcium and vitamin D supplementation (Ca/vitamin D) during IMT modified serum magnesium. Females (n=62) and males (n=51) consumed 2,000 mg calcium and 1,000 IU vitamin D/d or placebo during IMT (12 weeks). Dietary magnesium intakes were estimated using FFQ, serum magnesium was assessed, and pQCT was performed on the tibia. Dietary magnesium intakes for females and males pre-IMT were below the estimated average requirement and did not change with training. Serum magnesium increased during IMT in females (0.06±0.08 mmol/L) compared to males (−0.02±0.10 mmol/L; P<0.001) and in those consuming Ca/vitamin D (0.05±0.09 mmol/L) compared to placebo (0.001±0.11 mmol/L; P=0.015). In females, serum magnesium was associated with total bone mineral content (BMC, β=0.367, P=0.004) and robustness (β=0.393, P=0.006) at the distal 4% site, stress strain index (SSIp, β=0.334, P=0.009) and robustness (β=0.420, P=0.004) at the 14% diaphyseal site, and BMC (β=0.309, P=0.009) and SSIp (β=0.314, P=0.006) at the 66% diaphyseal site pre-IMT. No significant relationships between serum magnesium and bone measures were observed in males. Findings suggest that serum magnesium may be modulated by Ca/vitamin D intake and may impact tibial bone health during training in female military recruits.

Vitamin D Deficiency and Intoxication - A concern either way

JMS SKIMS ◽  
2011 ◽  
Vol 14 (2) ◽  
pp. 40-42
Author(s):  
Muzafar Maqsood Wani ◽  
Imtiaz Ahmed Wani
Keyword(s):  
Vitamin D ◽  
Cell Growth ◽  
Bone Turnover ◽  
Secondary Hyperparathyroidism ◽  
Vitamin D Deficiency ◽  
Bone Mineralization ◽  
Normal Blood ◽  
Blood Levels ◽  
Calcium And Phosphorus ◽  
Biologic Function

Major biologic function of activated vitamin D is to maintain normal blood levels of calcium and phosphorus, thus regulating bone mineralization. Research suggests that vitamin D may help in immunomodulation, regulating cell growth and 1,4 differentiation as well as some diverse unspecified functions. Overt vitamin D deficiency leads to hypocalcaemia, secondary hyperparathyroidism and increased bone turnover, which in prolonged and severe cases may cause rickets in children and osteomalacia in elderly.... JMS 2011;14(2):40-42

Structure and Function of Angiopoietin-like Protein 3 (ANGPTL3) in Atherosclerosis

2020 ◽  
Vol 27 (31) ◽  
pp. 5159-5174 ◽  
Author(s):  
Xinjie Lu
Keyword(s):  
Low Density Lipoprotein ◽  
Lipoprotein Metabolism ◽  
Density Lipoprotein ◽  
Structure And Function ◽  
Biological Functions ◽  
Pharmacological Management ◽  
Vascular Growth ◽  
Promising Target ◽  
And Function ◽  
Systematic Appraisal

Background:Angiopoietin-Like Proteins (ANGPTLs) are structurally related to the angiopoietins. A total of eight ANGPTLs (from ANGPTL1 to ANGPTL8) have been identified so far. Most ANGPTLs possess multibiological functions on lipid metabolism, atherosclerosis, and cancer. Among them, ANGPTL3 has been shown to regulate the levels of Very Low-Density Lipoprotein (VLDL) made by the liver and play a crucial role in human lipoprotein metabolism.Method:A systematic appraisal of ANGPTLs was conducted, focusing on the main features of ANGPTL3 that has a significant role in atherosclerosis.Results:Angiopoietins including ANGPTL3 are vascular growth factors that are highly specific for endothelial cells, perform a variety of other regulatory activities to influence inflammation, and have been shown to possess both pro-atherosclerotic and atheroprotective effects.Conclusion:ANGPTL3 has been demonstrated as a promising target in the pharmacological management of atherosclerosis. However, many questions remain about its biological functions.

scholarly journals Vitamin D Status in Children with Idiopathic Dilated Cardiomyopathy

2021 ◽  
Vol 11 (01) ◽  
pp. e120-e124
Author(s):  
Duaa M. Raafat ◽  
Osama M. EL-Asheer ◽  
Amal A. Mahmoud ◽  
Manal M. Darwish ◽  
Naglaa S. Osman
Keyword(s):  
Vitamin D ◽  
Serum Level ◽  
Dilated Cardiomyopathy ◽  
Smooth Muscles ◽  
Left Ventricular ◽  
Idiopathic Dilated Cardiomyopathy ◽  
Vitamin D Receptors ◽  
Left Ventricular Dimensions ◽  
And Function ◽  
Ventricular Dimensions

AbstractDilated cardiomyopathy (DCM) is the third leading cause of heart failure in pediatrics. The exact etiology of DCM is unknown in more than half of the cases. Vitamin D receptors are represented in cardiac muscles, endothelium, and smooth muscles of blood vessels suggesting that vitamin D could have a vital cardioprotective function. This study aimed to assess serum level of vitamin D in children with idiopathic DCM and to correlate the serum level of vitamin D with the left ventricular dimensions and function. This study is a descriptive cross-sectional single-center study, includes 44 children of both sexes, diagnosed as idiopathic DCM. Serum level of vitamin D was assessed and correlated with the left ventricular dimensions and function. Mean age of studied children was 6.08 ± 4.4 years. Vitamin D deficiency was found in 90.9% of children with idiopathic DCM with a mean level 13.48 ng/mL. There was a negative correlation between vitamin D level and fraction shortening and left ventricular end-diastolic diameter in children with DCM. Vitamin D level is not only significantly low in children with idiopathic DCM but it is also significantly correlated with the degree of left ventricular dysfunction.

scholarly journals Cellular and metabolic mechanisms of nutrient actions in immune function

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Philip Newsholme
Keyword(s):  
Amino Acids ◽  
Fatty Acids ◽  
Vitamin D ◽  
Immune System ◽  
Cell Function ◽  
Immune Cell ◽  
Cell Structure ◽  
Nutritional Intervention ◽  
Immune Cell Function ◽  
And Function

AbstractVarious nutrients can change cell structure, cellular metabolism, and cell function which is particularly important for cells of the immune system as nutrient availability is associated with the activation and function of diverse immune subsets. The most important nutrients for immune cell function and fate appear to be glucose, amino acids, fatty acids, and vitamin D. This perspective will describe recently published information describing the mechanism of action of prominent nutritional intervention agents where evidence exists as to their action and potency.

scholarly journals Osteoporosis in Patients with Chronic Kidney Diseases: A Systemic Review

2020 ◽  
Vol 21 (18) ◽  
pp. 6846 ◽  
Author(s):  
Chia-Yu Hsu ◽  
Li-Ru Chen ◽  
Kuo-Hu Chen
Keyword(s):  
Vitamin D ◽  
Bone Turnover ◽  
Fracture Risk ◽  
Renal Osteodystrophy ◽  
Bone Structure ◽  
Kidney Diseases ◽  
Treatment Strategies ◽  
Vitamin D Supplementation ◽  
Systemic Review ◽  
Lifestyle Modifications

Chronic kidney disease (CKD) is associated with the development of mineral bone disorder (MBD), osteoporosis, and fragility fractures. Among CKD patients, adynamic bone disease or low bone turnover is the most common type of renal osteodystrophy. The consequences of CKD-MBD include increased fracture risk, greater morbidity, and mortality. Thus, the goal is to prevent the occurrences of fractures by means of alleviating CKD-induced MBD and treating subsequent osteoporosis. Changes in mineral and humoral metabolism as well as bone structure develop early in the course of CKD. CKD-MBD includes abnormalities of calcium, phosphorus, PTH, and/or vitamin D; abnormalities in bone turnover, mineralization, volume, linear growth, or strength; and/or vascular or other soft tissue calcification. In patients with CKD-MBD, using either DXA or FRAX to screen fracture risk should be considered. Biomarkers such as bALP and iPTH may assist to assess bone turnover. Before initiating an antiresorptive or anabolic agent to treat osteoporosis in CKD patients, lifestyle modifications, such as exercise, calcium, and vitamin D supplementation, smoking cessation, and avoidance of excessive alcohol intake are important. Managing hyperphosphatemia and SHPT are also crucial. Understanding the complex pathogenesis of CKD-MBD is crucial in improving one’s short- and long-term outcomes. Treatment strategies for CKD-associated osteoporosis should be patient-centered to determine the type of renal osteodystrophy. This review focuses on the mechanism, evaluation and management of patients with CKD-MBD. However, further studies are needed to explore more details regarding the underlying pathophysiology and to assess the safety and efficacy of agents for treating CKD-MBD.

Mechanisms implicated in the growth regulatory effects of vitamin D in breast cancer.

2002 ◽  
pp. 45-59 ◽  
Author(s):  
K W Colston ◽  
C M√∏rk Hansen
Keyword(s):  
Breast Cancer ◽  
Vitamin D ◽  
Bone Mineralization ◽  
Active Form ◽  
Cell Types ◽  
Cell Cycle Regulators ◽  
Dihydroxyvitamin D ◽  
Cell Growth And Differentiation ◽  
Regulatory Effects ◽  
Apoptotic Effects

It is now well established that, in addition to its central role in the maintenance of extracellular calcium levels and bone mineralization, 1,25-dihydroxyvitamin D(3) (1,25(OH)(2)D(3)), the active form of vitamin D, also acts as a modulator of cell growth and differentiation in a number of cell types, including breast cancer cells. The anti-proliferative effects of 1,25(OH)(2)D(3) have been linked to suppression of growth stimulatory signals and potentiation of growth inhibitory signals, which lead to changes in cell cycle regulators such as p21(WAF-1/CIP1) and p27(kip1), cyclins and retinoblastoma protein as well as induction of apoptosis. Such studies have led to interest in the potential use of 1,25(OH)(2)D(3) in the treatment or prevention of certain cancers. Since this approach is limited by the tendency of 1,25(OH)(2)D(3) to cause hypercalcaemia, synthetic vitamin D analogues have been developed which display separation of the growth regulating effects from calcium mobilizing actions. This review examines mechanisms by which 1,25(OH)(2)D(3) and its active analogues exert both anti-proliferative and pro-apoptotic effects and describes some of the synthetic analogues that have been shown to be of particular interest in relation to breast cancer.

Sign in / Sign up

Export Citation Format

Share Document