The comprehensive mechanistic insight into the effects of vitamin D on dementia – a review

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Jaber Jafarzadeh ◽  
Laleh Payahoo ◽  
Mohammad Yousefi ◽  
Ali Barzegar
Keyword(s):  
Oxidative Stress ◽  
Vitamin D ◽  
Bone Mineralization ◽  
Serum Levels ◽  
Skeletal Maturation ◽  
Micronutrient Deficiencies ◽  
Neuroprotective Effects ◽  
Content Type ◽  
Modifiable Factors

Purpose This paper aims to depict the mechanistic role of vitamin D on dementia prevention, relief of the severity and the complication of the disease. All papers indexed in scientific databases, including Scopus, Elsevier, PubMed, Embase and Google Scholar between 2000 and 2021 were extracted and discussed. To present the mechanistic role of vitamin D in declining the severity of dementia, keywords including dementia, vitamin D, oxidative stress, inflammation, amyloid beta-Peptides were used. Design/methodology/approach Dementia is a prevalent cognitive disorder worldwide, especially in elderly people, which is accompanied by serious disabilities. Besides genetic, biological and lifestyle factors are involved in the incidence of dementia. An unhealthy diet along with micronutrient deficiencies are among modifiable factors. Vitamin D is one of the important micronutrients in brain health. Besides the involvement in gene expression, bone mineralization, apoptosis, inflammation, skeletal maturation, neurotropic action and hemostasis of phosphate and calcium, vitamin D also exerts neuroprotective effects via genomic and non-genomic pathways. Findings Vitamin D up-regulates the expression of various genes involved in dementia incidence via various mechanisms. Decreasing oxidative stress and the neuro-inflammatory cytokines levels, regulation of the expression of alternated Proteins including Tau and Amyloid-ß, calcium homeostasis in the central nervous system and also vascular are considered main mechanisms. Originality/value Considering the importance of diet in preventing dementia, adherence to a healthy diet that provides essential nutrients to brain function seems to be urgent. Controlling serum levels of vitamin D periodically and providing vitamin D by related sources or supplements, if there is a deficiency, is recommended. Future studies are needed to clarify other related mechanisms.

scholarly journals Benefits under the Sea: The Role of Marine Compounds in Neurodegenerative Disorders

Marine Drugs ◽  
2021 ◽  
Vol 19 (1) ◽  
pp. 24
Author(s):  
Mariano Catanesi ◽  
Giulia Caioni ◽  
Vanessa Castelli ◽  
Elisabetta Benedetti ◽  
Michele d’Angelo ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Neurodegenerative Disorders ◽  
Extreme Temperature ◽  
Bioactive Molecules ◽  
Neuroprotective Effects ◽  
Physical Conditions ◽  
Adjuvant Therapies ◽  
Marine Habitats ◽  
Marine Compounds

Marine habitats offer a rich reservoir of new bioactive compounds with great pharmaceutical potential; the variety of these molecules is unique, and its production is favored by the chemical and physical conditions of the sea. It is known that marine organisms can synthesize bioactive molecules to survive from atypical environmental conditions, such as oxidative stress, photodynamic damage, and extreme temperature. Recent evidence proposed a beneficial role of these compounds for human health. In particular, xanthines, bryostatin, and 11-dehydrosinulariolide displayed encouraging neuroprotective effects in neurodegenerative disorders. This review will focus on the most promising marine drugs’ neuroprotective potential for neurodegenerative disorders, such as Parkinson’s and Alzheimer’s diseases. We will describe these marine compounds’ potential as adjuvant therapies for neurodegenerative diseases, based on their antioxidant, anti-inflammatory, and anti-apoptotic properties.

scholarly journals Role of vitamin D serum levels in prevention of primary and recurrent melanoma

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
M. Lombardo ◽  
A. Vigezzi ◽  
G. Ietto ◽  
C. Franchi ◽  
V. Iori ◽  
...  
Keyword(s):  
Vitamin D ◽  
Serum Levels ◽  
Mitotic Rate ◽  
Control Group ◽  
Healthy Population ◽  
Histological Subtype ◽  
Melanoma Diagnosis ◽  
Significant Difference ◽  
Tumour Location

AbstractPatients afflicted with melanoma show lower vitamin D serum levels (VDSL) than the healthy population. This hypothesis agrees with its well-known antiproliferative features. An observational study was carried out to collect VDSL in patients suffering from melanoma. Our aim was to identify a potential connection between low VDSL and the risk to incur melanoma. Furthermore, we studied the association between VDSL at the diagnosis of melanoma and other germane prognostic factors. The population held in regard was composed of 154 patients with a diagnosis of melanoma between 2016 and 2019. These patients were retrospectively collected from our follow-up storage. We compared VDSL to clinical and pathological parameters (age, sex, tumour location, Breslow’s depth, Clark’s level, histological subtype, ulceration, et aliqua). Moreover, we recruited a control group with negative melanoma history. Mean and median of VDSL were significantly lower in the melanoma group. Instead, we found a negative association between melanoma and VDSL > 30 ng/L (OR 0.11; p < 0.0001). No correlation between VDSL and both Breslow’s depth and Clark’s level was discovered, but the VDSL comparison between thin (depth ≤ 1 mm) and thick tumours (depth > 1 mm) revealed a statistically significant difference (21.1 ± 8.2 ng/L vs 17.8 ± 8.1; p = 0.01). Moreover, VDSL were significantly lower in melanomas with mitotic rate ≥ 1/mm2 (22.1 ± 8.3 ng/L; p < 0007). Nevertheless, no connection was found between VDSL and both ulceration and positive sentinel nodes (p = 0.76; p = 0.74). Besides, our study revealed no association between VDSL and histological subtype (p = 0.161). Lower VDSL correlate with thick and high mitotic rate tumours. Future prospective studies would investigate if appropriate upkeep of suitable VDSL can decrease the risk of primary and recurrent melanoma diagnosis.

Vitamine D en het risico op ASS

2021 ◽  
Vol 20 (2) ◽  
Author(s):  
Huub F.J. Savelkoul
Keyword(s):  
Vitamin D ◽  
Serum Levels ◽  
First Trimester ◽  
Autism Spectrum ◽  
Maternal Serum ◽  
Immune Reactivity ◽  
Anti Oxidant ◽  
First Trimester Of Pregnancy ◽  
Spectrum Disorders

Autism spectrum disorders (ASD) is a heterogeneous group of behavioral disorders in which a disturbed immune reactivity can contribute to the etiology. In retrospective research we found an association between the risk to develop ASD and the month of birth with a peak in July pointing at a possible decreased exposure to sunlight during the first two semesters of pregnancy. This could point to an important role of vitamin D which has important anti-inflammatory and anti-oxidant activities and thereby regulates the proper functioning of the immune system in these individuals. Maternal serum levels of vitamin D double during the first trimester of pregnancy and therefore decreased exposure to sunlight resulting in diminished levels of vitamin D production can be an important risk factor for the development of ASD. However, there is a need for more integrated multidisciplinary studies in families where all siblings are also studied to elucidate the contribution of their genetic risk factors.

Role of Vitamins in Neurodegenerative Diseases: A Review

2021 ◽  
Vol 20 ◽  
Author(s):  
Ravi Ranjan Kumar ◽  
Lovekesh Singh ◽  
Amandeep Thakur ◽  
Shamsher Singh ◽  
Bhupinder Kumar
Keyword(s):  
Oxidative Stress ◽  
Alzheimer’S Disease ◽  
Vitamin D ◽  
Vitamin C ◽  
Huntington's Disease ◽  
Huntington’S Disease ◽  
Vitamin D Deficiency ◽  
Neurological Disorders ◽  
The Brain

Background: Vitamins are the micronutrients required for boosting the immune system and managing any future infection. Vitamins are involved in neurogenesis, a defense mechanism working in neurons, metabolic reactions, neuronal survival, and neuronal transmission. Their deficiency leads to abnormal functions in the brain like oxidative stress, mitochondrial dysfunction, accumulation of proteins (synuclein, Aβ plaques), neurodegeneration, and excitotoxicity. Methods: In this review, we have compiled various reports collected from PubMed, Scholar Google, Research gate, and Science direct. The findings were evaluated, compiled, and represented in this manuscript. Conclusion: The deficiency of vitamins in the body causes various neurological disorders like Alzheimer’s disease, Parkinson’s disease, Huntington's disease, and depression. We have discussed the role of vitamins in neurological disorders and the normal human body. Depression is linked to a deficiency of vitamin-C and vitamin B. In the case of Alzheimer’s disease, there is a lack of vitamin-B1, B12, and vitamin-A, which results in Aβ-plaques. Similarly, in Parkinson’s disease, vitamin-D deficiency leads to a decrease in the level of dopamine, and imbalance in vitamin D leads to accumulation of synuclein. In MS, Vitamin-C and Vitamin-D deficiency causes demyelination of neurons. In Huntington's disease, vitamin- C deficiency decreases the antioxidant level, enhances oxidative stress, and disrupts the glucose cycle. Vitamin B5 deficiency in Huntington's disease disrupts the synthesis of acetylcholine and hormones in the brain.

Role of vitamin D in oxidative stress modulation in end‐stage renal disease patients: A double‐blind randomized clinical trial

2020 ◽  
Vol 24 (3) ◽  
pp. 367-373
Author(s):  
Leila Malekmakan ◽  
Zeinab Karimi ◽  
Afshin Mansourian ◽  
Maryam Pakfetrat ◽  
Jamshid Roozbeh ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Clinical Trial ◽  
Vitamin D ◽  
Renal Disease ◽  
Randomized Clinical Trial ◽  
End Stage Renal Disease ◽  
Double Blind ◽  
Stage Renal Disease ◽  
End Stage

scholarly journals Effects of Oxygen Availability on Acetic Acid Tolerance and Intracellular pH in Dekkera bruxellensis

2016 ◽  
Vol 82 (15) ◽  
pp. 4673-4681 ◽  
Author(s):  
Claudia Capusoni ◽  
Stefania Arioli ◽  
Paolo Zambelli ◽  
M. Moktaduzzaman ◽  
Diego Mora ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Acetic Acid ◽  
Intracellular Ph ◽  
Acid Tolerance ◽  
Oxygen Availability ◽  
Industrial Processes ◽  
Dekkera Bruxellensis ◽  
Acetic Acid Tolerance ◽  
Content Type

ABSTRACTThe yeastDekkera bruxellensis, associated with wine and beer production, has recently received attention, because its high ethanol and acid tolerance enables it to compete withSaccharomyces cerevisiaein distilleries that produce fuel ethanol. We investigated how different cultivation conditions affect the acetic acid tolerance ofD. bruxellensis. We analyzed the ability of two strains (CBS 98 and CBS 4482) exhibiting different degrees of tolerance to grow in the presence of acetic acid under aerobic and oxygen-limited conditions. We found that the concomitant presence of acetic acid and oxygen had a negative effect onD. bruxellensisgrowth. In contrast, incubation under oxygen-limited conditions resulted in reproducible growth kinetics that exhibited a shorter adaptive phase and higher growth rates than those with cultivation under aerobic conditions. This positive effect was more pronounced in CBS 98, the more-sensitive strain. Cultivation of CBS 98 cells under oxygen-limited conditions improved their ability to restore their intracellular pH upon acetic acid exposure and to reduce the oxidative damage to intracellular macromolecules caused by the presence of acetic acid. This study reveals an important role of oxidative stress in acetic acid tolerance inD. bruxellensis, indicating that reduced oxygen availability can protect against the damage caused by the presence of acetic acid. This aspect is important for optimizing industrial processes performed in the presence of acetic acid.IMPORTANCEThis study reveals an important role of oxidative stress in acetic acid tolerance inD. bruxellensis, indicating that reduced oxygen availability can have a protective role against the damage caused by the presence of acetic acid. This aspect is important for the optimization of industrial processes performed in the presence of acetic acid.

scholarly journals EfaR Is a Major Regulator of Enterococcus faecalis Manganese Transporters and Influences Processes Involved in Host Colonization and Infection

2013 ◽  
Vol 81 (3) ◽  
pp. 935-944 ◽  
Author(s):  
M. C. Abrantes ◽  
J. Kok ◽  
M. de F. Lopes
Keyword(s):  
Oxidative Stress ◽  
Metal Ions ◽  
Enterococcus Faecalis ◽  
Bacterial Endocarditis ◽  
Nosocomial Pathogen ◽  
Host Colonization ◽  
Content Type ◽  
Bacterial Pathogenicity

ABSTRACTMetal ions, in particular manganese, are important modulators of bacterial pathogenicity. However, little is known about the role of manganese-dependent proteins in the nosocomial pathogenEnterococcus faecalis, a major cause of bacterial endocarditis. The present study demonstrates that the DtxR/MntR family metalloregulator EfaR ofE. faecaliscontrols the expression of several of its regulon members in a manganese-dependent way. We also show thatefaRinactivation impairs the ability ofE. faecalisto form biofilms, to survive inside macrophages, and to tolerate oxidative stress. Our results reveal that EfaR is an important modulator ofE. faecalisvirulence and link manganese homeostasis to enterococcal pathogenicity.

scholarly journals Micronutrients and the pathogenesis of human immunodeficiency virus infection

1999 ◽  
Vol 81 (3) ◽  
pp. 181-189 ◽  
Author(s):  
R. D. Semba ◽  
A. M. Tang
Keyword(s):  
Oxidative Stress ◽  
Human Immunodeficiency Virus ◽  
Virus Infection ◽  
Hiv Infection ◽  
Serum Levels ◽  
Micronutrient Supplementation ◽  
Micronutrient Deficiencies ◽  
Immunodeficiency Virus ◽  
Altered Metabolism ◽  
Low Levels

Micronutrient deficiencies may be common during human immunodeficiency virus (HIV) infection. Insufficient dietary intake, malabsorption, diarrhoea, and impaired storage and altered metabolism of micronutrients can contribute to the development of micronutrient deficiencies. Low plasma or serum levels of vitamins A, E, B6, B12 and C, carotenoids, Se, and Zn are common in many HIV-infected populations. Micronutrient deficiencies may contribute to the pathogenesis of HIV infection through increased oxidative stress and compromised immunity. Low levels or intakes of micronutrients such as vitamins A, E, B6 and B12, Zn and Se have been associated with adverse clinical outcomes during HIV infection, and new studies are emerging which suggest that micronutrient supplementation may help reduce morbidity and mortality during HIV infection.

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