scholarly journals Analysis of expression of vitamin E-binding proteins in H2O2 induced SK-N-SH neuronal cells supplemented with α-tocopherol and tocotrienol-rich fraction

PLoS ONE ◽  
2020 ◽  
Vol 15 (11) ◽  
pp. e0241112
Author(s):  
Aishatu Ali Chiroma ◽  
Huzwah Khaza’ai ◽  
Roslida Abd. Hamid ◽  
Sui Kiat Chang ◽  
Zainul Amiruddin Zakaria ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Vitamin E ◽  
Binding Proteins ◽  
Neuronal Cells ◽  
Transport Proteins ◽  
Expression Levels ◽  
Transfer Protein ◽  
High Affinity ◽  
Stress Oxidative ◽  
Tocotrienol Rich Fraction

Natural α-tocopherol (α-TCP), but not tocotrienol, is preferentially retained in the human body. α-Tocopherol transfer protein (α-TTP) is responsible for binding α-TCP for cellular uptake and has high affinity and specificity for α-TCP but not α-tocotrienol. The purpose of this study was to examine the modification of α-TTP together with other related vitamin E-binding genes (i.e., TTPA, SEC14L2, and PI-TPNA) in regulating vitamin E uptake in neuronal cells at rest and under oxidative stress. Oxidative stress was induced with H2O2 for an hour which was followed by supplementation with different ratios of α-TCP and tocotrienol-rich fraction (TRF) for four hours. The cellular levels of vitamin E were quantified to determine bioavailability at cellular levels. The expression levels of TTPA, SEC14L2, and PI-TPNA genes in 0% α-TCP were found to be positively correlated with the levels of vitamin E in resting neuronal cells. In addition, the regulation of all the above-mentioned genes affect the distribution of vitamin E in the neuronal cells. It was observed that, increased levels of α-TCP secretion occur under oxidative stress. Thus, our results showed that in conclusion vitamin E-binding proteins may be modified in the absence of α-TCP to produce tocotrienols (TCT), as a source of vitamin E. The current study suggests that the expression levels of vitamin E transport proteins may influence the cellular concentrations of vitamin E levels in the neuronal cells.

Cytoprotective Effect of Tocotrienol-Rich Fraction and α-Tocopherol Vitamin E Isoforms Against Glutamate-Induced Cell Death in Neuronal Cells

2014 ◽  
Vol 84 (3-4) ◽  
pp. 0140-0151 ◽  
Author(s):  
Thilaga Rati Selvaraju ◽  
Huzwah Khaza’ai ◽  
Sharmili Vidyadaran ◽  
Mohd Sokhini Abd Mutalib ◽  
Vasudevan Ramachandran ◽  
...  
Keyword(s):  
Vitamin E ◽  
Cell Viability ◽  
Neuronal Cells ◽  
Positive Control ◽  
Post Treatment ◽  
Mitochondrial Activity ◽  
Before And After ◽  
Pre Treatment ◽  
Tocotrienol Rich Fraction ◽  
Major Mediator

Glutamate is the major mediator of excitatory signals in the mammalian central nervous system. Extreme amounts of glutamate in the extracellular spaces can lead to numerous neurodegenerative diseases. We aimed to clarify the potential of the following vitamin E isomers, tocotrienol-rich fraction (TRF) and α-tocopherol (α-TCP), as potent neuroprotective agents against glutamate-induced injury in neuronal SK-N-SH cells. Cells were treated before and after glutamate injury (pre- and post-treatment, respectively) with 100 - 300 ng/ml TRF/α-TCP. Exposure to 120 mM glutamate significantly reduced cell viability to 76 % and 79 % in the pre- and post-treatment studies, respectively; however, pre- and post-treatment with TRF/α-TCP attenuated the cytotoxic effect of glutamate. Compared to the positive control (glutamate-injured cells not treated with TRF/α-TCP), pre-treatment with 100, 200, and 300 ng/ml TRF significantly improved cell viability following glutamate injury to 95.2 %, 95.0 %, and 95.6 %, respectively (p < 0.05).The isomers not only conferred neuroprotection by enhancing mitochondrial activity and depleting free radical production, but also increased cell viability and recovery upon glutamate insult. Our results suggest that vitamin E has potent antioxidant potential for protecting against glutamate injury and recovering glutamate-injured neuronal cells. Our findings also indicate that both TRF and α-TCP could play key roles as anti-apoptotic agents with neuroprotective properties.

Localization of α-tocopherol transfer protein in the brains of patients with ataxia with vitamin E deficiency and other oxidative stress related neurodegenerative disorders

1999 ◽  
Vol 822 (1-2) ◽  
pp. 80-87 ◽  
Author(s):  
Richard P. Copp ◽  
Thomas Wisniewski ◽  
Fayçal Hentati ◽  
Abdelmajid Larnaout ◽  
Mongi Ben Hamida ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Vitamin E ◽  
Neurodegenerative Disorders ◽  
Vitamin E Deficiency ◽  
Transfer Protein

scholarly journals Vitamins D and E Stimulate the PI3K-AKT Signalling Pathway in Insulin-Resistant SK-N-SH Neuronal Cells

Nutrients ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 2525 ◽  
Author(s):  
Amirah Salwani Zaulkffali ◽  
Nurliyana Najwa Md Razip ◽  
Sharifah Sakinah Syed Alwi ◽  
Afifah Abd Jalil ◽  
Mohd Sokhini Abd Mutalib ◽  
...  
Keyword(s):  
Vitamin D ◽  
Vitamin E ◽  
Glucose Uptake ◽  
Insulin Signalling ◽  
Neuronal Cells ◽  
Signalling Pathway ◽  
Enzyme Linked Immunosorbent Assay ◽  
Expression Levels ◽  
Insulin Resistant ◽  
Insulin Signalling Pathway

This study investigated the effects of vitamins D and E on an insulin-resistant model and hypothesized that this treatment would reverse the effects of Alzheimer’s disease (AD) and improves insulin signalling. An insulin-resistant model was induced in SK-N-SH neuronal cells with a treatment of 250 nM insulin and re-challenged with 100 nM at two different incubation time (16 h and 24 h). The effects of vitamin D (10 and 20 ng/mL), vitamin E in the form of tocotrienol-rich fraction (TRF) (200 ng/mL) and the combination of vitamins D and E on insulin signalling markers (IR, PI3K, GLUT3, GLUT4, and p-AKT), glucose uptake and AD markers (GSK3β and TAU) were determined using quantitative real-time polymerase chain reaction (qRT-PCR) and enzyme-linked immunosorbent assay (ELISA). The results demonstrated an improvement of the insulin signalling pathway upon treatment with vitamin D alone, with significant increases in IR, PI3K, GLUT3, GLUT4 expression levels, as well as AKT phosphorylation and glucose uptake, while GSK3β and TAU expression levels was decreased significantly. On the contrary, vitamin E alone, increased p-AKT, reduced the ROS as well as GSK3β and TAU but had no effect on the insulin signalling expression levels. The combination of vitamins D and E only showed significant increase in GLUT4, p-AKT, reduced ROS as well as GSK3β and TAU. Thus, the universal role of vitamin D, E alone and in combinations could be the potential nutritional agents in restoring the sensitivity of neuronal cells towards insulin and delaying the pathophysiological progression of AD.

In Silico Docking of Vitamin E Isomers on Transport Proteins

2020 ◽  
Vol 16 (4) ◽  
pp. 467-472
Author(s):  
Nurul Syeefa Zulkiflee ◽  
Siti Amilia Awang ◽  
Woo Xian Ming ◽  
Muhammad Fauzan Wira’i Kamilan ◽  
M Yuveneshwari Mariappan ◽  
...  
Keyword(s):  
Vitamin E ◽  
In Silico ◽  
Intracellular Trafficking ◽  
Intracellular Transport ◽  
Protein Structures ◽  
Transport Proteins ◽  
Collagen Type Iv ◽  
Pleckstrin Homology Domain ◽  
In Silico Docking ◽  
Transfer Protein

Background: Vitamin E is comprised of α, β, γ and δ-tocopherols (Ts) and α, β, γ and δ- tocotrienols (T3s). Vitamin E has neuroprotective antioxidant, anti-cancer, and cholesterol-lowering effects. Intracellular trafficking of these isomers remains largely unknown, except for αT which is selectively transported by αT transfer protein (αTTP). Objective: This study aimed to determine the binding of vitamin E isomers on transport proteins using in silico docking. Methods: Transport proteins were selected using AmiGo Gene Ontology tool based on the same molecular function annotation as αTTP. Protein structures were obtained from the Protein Data Bank. Ligands structures were obtained from ZINC database. In silico docking was performed using SwissDock. Results and Discussion: A total of 6 transport proteins were found: SEC14-like protein 2, glycolipid transfer protein (GLTP), pleckstrin homology domain-containing family A member 8, collagen type IV alpha-3-binding protein, ceramide-1-phosphate transfer protein and afamin. Compared with other transport proteins, αTTP had the highest affinities for all isomers except βT3. Binding order of vitamin E isomers toward αTTP was γT > βT > αT > δT > αT3 > γT3 > δT3 > βT3. GLTP had a higher affinity for tocotrienols than tocopherols. βT3 bound stronger to GLTP than αTTP. Conclusion: αTTP remained as the most preferred transport protein for most of the isomers. The binding affinity of αT toward αTTP was not the highest than other isomers suggested that other intracellular trafficking mechanisms of these isomers may exist. GLTP may mediate the intracellular transport of tocotrienols, especially βT3. Improving the bioavailability of these isomers may enhance their beneficial effects to human.

scholarly journals Chronic Stress and Oxidative Stress as Common Factors of the Pathogenesis of Depression and Alzheimer’s Disease: The Role of Antioxidants in Prevention and Treatment

Antioxidants ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1439 ◽  
Author(s):  
Gabriela Juszczyk ◽  
Joanna Mikulska ◽  
Kamila Kasperek ◽  
Diana Pietrzak ◽  
Weronika Mrozek ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Vitamin E ◽  
Chronic Stress ◽  
Antioxidant Properties ◽  
Stress Oxidative ◽  
The Relationship ◽  
The Brain

There is a growing body of scientific research showing the link between depression and dementia in Alzheimer’s disease (AD). The chronic stress contributes to the formation of oxidative stress in the parts of the brain involved in the development of depression and AD. The scientific literature reports the significant role of antioxidants, which are highly effective in treating these diseases. In this review, we have summarized the relationship between chronic stress, oxidative stress, and the changes in the brain they cause occurring in the brain. Among all the compounds showing antioxidant properties, the most promising results in AD treatment were observed for Vitamin E, coenzyme Q10 (CoQ10), melatonin, polyphenols, curcumin, and selenium. In case of depression treatment, the greatest potential was observed in curcumin, zinc, selenium, vitamin E, and saffron.

Regulation of the α-tocopherol transfer protein in mice: Lack of response to dietary vitamin E or oxidative stress

Lipids ◽  
2006 ◽  
Vol 41 (2) ◽  
pp. 105-112 ◽  
Author(s):  
Deborah L. Bella ◽  
Bettina C. Schock ◽  
Yunsook Lim ◽  
Scott W. Leonard ◽  
Crystal Berry ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Vitamin E ◽  
Dietary Vitamin ◽  
Transfer Protein

Nonalcoholic Fatty Liver Disease and Vitamin E - A Promising Relationship?

2019 ◽  
Vol 70 (1) ◽  
pp. 78-83
Author(s):  
Alexandra Totan ◽  
Daniela Gabriela Balan ◽  
Daniela Miricescu ◽  
Radu Radulescu ◽  
Iulia Ioana Stanescu ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Vitamin E ◽  
Therapeutic Potential ◽  
Plga Nanoparticles ◽  
Diet Group ◽  
Normal Diet ◽  
Oxidative Stress Biomarkers ◽  
Promising Alternative ◽  
Nonalcoholic Fatty Liver ◽  
High Caloric Diet

Oxidative stress (OS) plays an important role in NAFLD molecular mechanism. Nanoencapsulation represents a novel strategy to enhance therapeutic potential of conventional drugs. Our study analyses the encapsulated vitamin E effect on lipid metabolism and oxidative stress biomarkers in NAFLD rats. Animals were divided into 3 groups : G1 - the normal diet group; G2- the high caloric diet group ; G3 - high-caloric diet group receiving PLGA-vit E, 50 mg / kg. Serum advanced human oxidative protein (AOPP), total antioxidant capacity (TAC) and vitamin E were analysed using ELISA technique. Our results showed significant increase of G2 GPT, ALP, GGT, TG, glucose, TC and AOPP, versus G1 ( P [ 0.05) and a significant decrease of G2 serum TAC and vitamin E versus G1 results ( p = 0.01 and 0.01). Vitamin E nanoparticles (G3) caused a significant increase of TAC and significant decrease of serum AOPP, versus G2 (p [ 0.01). Results showed a significant reduction of GPT, GGT, ALP, TG and total cholesterol ( p [0.05) in G3 versus G2. PLGA nanoparticles should be considered an attractive and promising alternative to improve the bioavailability and biological activity of vitaminE.

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