scholarly journals Role of genetic variants of vitamin D immunomodulation genes in clinical response to treatment of tuberculosis

2015 ◽  
Vol 141 (6) ◽  
pp. 840
Author(s):  
Soumyadeep Bhaumik ◽  
Nandita Hazra
Keyword(s):  
Vitamin D ◽  
Clinical Response ◽  
Genetic Variants ◽  
Response To Treatment

scholarly journals The Role of Vitamin D as a Biomarker in Alzheimer’s Disease

2021 ◽  
Vol 11 (3) ◽  
pp. 334
Author(s):  
Giulia Bivona ◽  
Bruna Lo Sasso ◽  
Caterina Maria Gambino ◽  
Rosaria Vincenza Giglio ◽  
Concetta Scazzone ◽  
...  
Keyword(s):  
Vitamin D ◽  
Risk Factor ◽  
Cognitive Decline ◽  
Immune Cell ◽  
Response To Treatment ◽  
Cellular Processes ◽  
Vitamin D Levels ◽  
The Brain ◽  
Key Questions

Vitamin D and cognition is a popular association, which led to a remarkable body of literature data in the past 50 years. The brain can synthesize, catabolize, and receive Vitamin D, which has been proved to regulate many cellular processes in neurons and microglia. Vitamin D helps synaptic plasticity and neurotransmission in dopaminergic neural circuits and exerts anti-inflammatory and neuroprotective activities within the brain by reducing the synthesis of pro-inflammatory cytokines and the oxidative stress load. Further, Vitamin D action in the brain has been related to the clearance of amyloid plaques, which represent a feature of Alzheimer Disease (AD), by the immune cell. Based on these considerations, many studies have investigated the role of circulating Vitamin D levels in patients affected by a cognitive decline to assess Vitamin D’s eventual role as a biomarker or a risk factor in AD. An association between low Vitamin D levels and the onset and progression of AD has been reported, and some interventional studies to evaluate the role of Vitamin D in preventing AD onset have been performed. However, many pitfalls affected the studies available, including substantial discrepancies in the methods used and the lack of standardized data. Despite many studies, it remains unclear whether Vitamin D can have a role in cognitive decline and AD. This narrative review aims to answer two key questions: whether Vitamin D can be used as a reliable tool for diagnosing, predicting prognosis and response to treatment in AD patients, and whether it is a modifiable risk factor for preventing AD onset.

Systemic Steroids Suppress Antimelanocyte Antibodies in Vitiligo

1997 ◽  
Vol 1 (4) ◽  
pp. 193-195 ◽  
Author(s):  
Seung-Kyung Hann ◽  
Dunlu Chen ◽  
Jean-Claude Bystryn
Keyword(s):  
Clinical Response ◽  
Steroid Treatment ◽  
Response To Therapy ◽  
Response To Treatment ◽  
Systemic Steroid ◽  
Good Clinical Response ◽  
Systemic Steroid Therapy ◽  
Initiation Of Therapy ◽  
Antibody Levels

Background: Vitiligo is associated with autoantibodies to melanocytes. The role of these antibodies in the pathogenesis of the disease is still unknown. Objective: The purpose of this study was to examine the role of vitiligo antibodies in the pathogenesis of the disease by studying whether or not there is a correlation between changes in their level and response to therapy with systemic steroid. Methods: Antibodies to the 40 to 45 kD, 75 kD, and 90 kD vitiligo antigens were measured prior to and following systemic steroid therapy in 10 patients with active vitiligo. Results: Four months following initiation of therapy, seven (78%) of nine patients with good clinical response to steroid treatment had a significant decrease in the level of vitiligo antibodies. By contrast, one patient who had no response to treatment had a slight increase in antibody levels. Conclusion: These findings suggest that one mechanism by which corticosteroids can cause repigmentation in vitiligo is by decreasing the level of vitiligo antibodies, and support the notion that vitiligo antibodies are involved in the pathogenesis of this disease.

The role of clinical response to treatment in determining pathogenicity of genomic variants

2020 ◽  
Author(s):  
Joseph J. Shen ◽  
Saskia B. Wortmann ◽  
Lonneke de Boer ◽  
Leo A. J. Kluijtmans ◽  
Marleen C. D. G. Huigen ◽  
...  
Keyword(s):  
Clinical Response ◽  
Response To Treatment ◽  
Genomic Variants

scholarly journals Haplotypes in the GC, CYP2R1 and CYP24A1 Genes and Biomarkers of Bone Mineral Metabolism in Older Adults

Nutrients ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 259
Author(s):  
Ana Fernández-Araque ◽  
Andrea Giaquinta-Aranda ◽  
Carmelo Moreno-Sainz ◽  
María Cruz Martínez-Martínez ◽  
Verónica Velasco-González ◽  
...  
Keyword(s):  
Vitamin D ◽  
Genetic Variants ◽  
Mineral Metabolism ◽  
Serum Levels ◽  
Codominant Model ◽  
Significant Difference ◽  
Candidate Gene Studies ◽  
Phosphorus Levels

Candidate gene studies have analyzed the effect of specific vitamin D pathway genes on vitamin D availability; however, it is not clear whether genetic variants also affect overall bone metabolism. This study evaluated the association between genetic polymorphisms in GC, CYP2R1 and CYP24A1 and serum levels of total 25(OH)D, iPTH and other mineral metabolism biomarkers (albumin, total calcium and phosphorus) in a sample of 273 older Spanish adults. We observed a significant difference between CYP2R1 rs10741657 codominant model and total 25(OH)D levels after adjusting them by gender (p = 0.024). In addition, the two SNPs in the GC gene (rs4588 and rs2282679) were identified significantly associated with iPTH and creatinine serum levels. In the case of phosphorus, we observed an association with GC SNPs in dominant model. We found a relationship between haplotype 2 and 25(OH)D levels, haplotype 4 and iPTH serum levels and haplotype 7 and phosphorus levels. In conclusion, genetic variants in CYP2R1 and GC could be predictive of 25(OH)D and iPTH serum levels, respectively, in older Caucasian adults. The current study confirmed the role of iPTH as one of the most sensitive biomarkers of vitamin D activity in vivo.

Vitamin D as a Potential Therapeutic Option in Cancer Treatment: Is There a Role for Chemoprevention?

2020 ◽  
Vol 20 (18) ◽  
pp. 2138-2149 ◽  
Author(s):  
Afsane Bahrami ◽  
Amirhossein Sahebkar
Keyword(s):  
Vitamin D ◽  
Clinical Trials ◽  
Cancer Risk ◽  
Genetic Variants ◽  
Randomized Clinical Trials ◽  
Bone Fractures ◽  
Therapeutic Option ◽  
Strong Association ◽  
Proliferation And Apoptosis

Background: Vitamin D (Vit D) serves as a precursor to the potent steroid hormone calcitriol, which regulates numerous genes that control homeostasis, epithelial cell differentiation, proliferation, and apoptosis. Low level of Vit D is implicated in the development and progression of several diseases including bone fractures, cardiovascular disease, diabetes mellitus, and cancers. The present review highlights the role of vitamin D in cancer with a particular emphasis on genetic variants related to Vit D metabolism as well as clinical trials of Vit D supplementation as a potential therapeutic option in the treatment of cancer patients. Methods: Data were collected following an electronic search in the Web of Science, Medline, PubMed, and Scopus databases by using some keywords such as “cancer”, “tumor”, “malignancy”, “vitamin D”, “cholecalciferol” and “calcitriol”. Results: The collected evidence from the studies revealed a consistent and strong association between Vit D status and cancer risk and survival. The associations between Vit D-related genetic variants and cancer survival support the hypothesis that Vit D may affect cancer outcomes. The mechanisms whereby Vit D reduces cancer risk and increases survival are regulation of cellular differentiation, proliferation and apoptosis as well as decreased angiogenesis in tumor microenvironment and inhibition of metastasis. Conclusion: There is a paucity of evidence-based recommendations for the optimal 25(OH)D levels in patients with cancer and the role of Vit D supplementation for primary or secondary prevention of cancer. Well-designed and sufficiently powered randomized clinical trials are necessary to assess the clinical application of Vit D in enhancing the clinical efficacy of standard and adjuvant chemotherapy regimens.

scholarly journals The Usefulness of Serum Vitamin D Levels in the Assessment of IBD Activity and Response to Biologics

Nutrients ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 323
Author(s):  
Marco Valvano ◽  
Marco Magistroni ◽  
Antonio Mancusi ◽  
Debora D’Ascenzo ◽  
Salvatore Longo ◽  
...  
Keyword(s):  
Vitamin D ◽  
Clinical Response ◽  
Roc Analysis ◽  
Serum Vitamin ◽  
Main Role ◽  
Biological Drugs ◽  
Serum Vitamin D ◽  
Vitamin D Levels ◽  
Histological Activity

The main role of vitamin D is calcium homeostasis and bone metabolism, although its activity as an immuno-modulator and its anti-inflammatory effect is well-known. Low blood vitamin D levels are common among patients with inflammatory bowel disease (IBD). Whether low vitamin D levels could affect the disease activity or it is an effect of a worse condition of the disease is still unclear. This study aimed to investigate the role of blood vitamin D levels to identify the clinical, endoscopic, and histological activity in a cohort of patients with ulcerative colitis (UC) or Crohn’s disease (CD) on therapy with biological drugs. In this retrospective cohort study, 50 IBD patients (24 UC and 26 CD) that underwent colonoscopy from January 2017 to January 2020 with a concomitant serological evaluation of vitamin D were included. Patients with clinical, endoscopic, and histological activity and those who lost their clinical response to the biological drug had lower vitamin D levels compared to patients in remission or patients that did not change therapeutic regimens. A receiver operating characteristic (ROC) analysis and Youden’s Index were performed to assess the optimal vitamin D levels to identify patients with the active disease. The ROC analysis showed an area under the curve (AUC) of 0.709 (p = 0.005; confidence interval (CI): 0.564–0.829), 0.769 (p < 0.001; CI: 0.628–0.876), and 0.810 (p < 0.001; CI: 0.670–0.910) for the clinical, endoscopic, and histological outcomes, respectively. The optimal vitamin D cut-off was ≤25 ng/mL. The vitamin D level is an additional useful tool in the evaluation of IBD patients with good accuracy to predict their endoscopic and histological activity and clinical response to biologics.

The role of vitamin D in metabolic and reproductive disturbances of polycystic ovary syndrome: A narrative mini-review

2020 ◽  
pp. 1-8
Author(s):  
Daniela Menichini ◽  
Gianpiero Forte ◽  
Beatrice Orrù ◽  
Giuseppe Gullo ◽  
Vittorio Unfer ◽  
...  
Keyword(s):  
Vitamin D ◽  
Polycystic Ovary Syndrome ◽  
Embryo Quality ◽  
Polycystic Ovary ◽  
Vitamin D Supplementation ◽  
Endometrial Receptivity ◽  
Metabolic Disturbances ◽  
Ovary Syndrome ◽  
Beneficial Role

Abstract. Vitamin D is a secosteroid hormone that plays a pivotal role in several metabolic and reproductive pathways in humans. Increasing evidence supports the role of vitamin D deficiency in metabolic disturbances and infertility in women with polycystic ovary syndrome (PCOS). Indeed, supplementation with vitamin D seems to have a beneficial role on insulin resistance and endometrial receptivity. On the other hand, exceedingly high levels of vitamin D appear to play a detrimental role on oocytes development and embryo quality. In the current review, we summarize the available evidence about the topic, aiming to suggest the best supplementation strategy in women with PCOS or, more generally, in those with metabolic disturbances and infertility. Based on the retrieved data, vitamin D seems to have a beneficial role on IR, insulin sensitivity and endometrial receptivity, but high levels and incorrect timing of administration seem to have a detrimental role on oocytes development and embryo quality. Therefore, we encourage a low dose supplementation (400–800 IU/day) particularly in vitamin D deficient women that present metabolic disturbances like PCOS. As far as the reproductive health, we advise vitamin D supplementation in selected populations, only during specific moments of the ovarian cycle, to support the luteal phase. However, ambiguities about dosage and timing of the supplementation still emerge from the clinical studies published to date and further studies are required.

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