The wonders of palm oil

Ahmad Parveez Ghulam Kadir

The Malaysian Palm Oil Board (MPOB)’s research and collaborations with local and overseas institutions have scientifically proven that palm-derived Vitamin E tocotrienols are important for human health as they can prevent many non-communicable diseases. Through the continuous and dedicated research conducted by MPOB, the health benefits of palm oil and its phyto-nutrients are being explored extensively.

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A review on vitamin E natural analogues and on the design of synthetic vitamin E derivatives as cytoprotective agents

Panagiotis Theodosis-Nobelos, Georgios Papagiouvannis, Eleni A Rekka

Mini Rev Med Chem . 2020 Aug 7. doi: 10.2174/1389557520666200807132617. Online ahead of print.

Abstract

Vitamin E, essential for human health, is widely used worldwide for therapeutic or dietary reasons. The differences in the metabolism and excretion of the multiple vitamin E forms are presented in this review. The important steps that influence the kinetics of each form and the distribution and processing of vitamin E forms by the liver are considered. The antioxidant as well as non-antioxidant properties of vitamin E forms are discussed. Finally, synthetic tocopherol and trolox derivatives, based on the design of multitarget directed compounds, are reviewed. It is demonstrated that selected derivatization of vitamin E or trolox structures can produce improved antioxidants, agents against cancer, cardiovascular and neurodegenerative disorders.

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Platelet function in stroke/transient ischemic attack patients treated with tocotrienol

Andrew Slivka, Cameron Rink, David Paoletto, Chandan K Sen

FASEB J . 2020 Jul 20. doi: 10.1096/fj.201902216RR. Online ahead of print.

Abstract

The purpose of this study was to characterize the effects of tocotrienol form of vitamin E (TCT) on platelet function in patients with stroke or transient ischemic attack (TIA). A double blind, randomized, single center phase II clinical trial was conducted comparing placebo (PBO) and 400 and 800 mg TCT daily for a year in 150 patients with a sentinel ischemic stroke or TIA event in the prior 6 months. Platelet function was measured at baseline and then, at 3 month intervals for a year, using light transmission aggregometry. The incidence of aspirin resistance in aspirin-treated patients or platelet inhibition in patients on clopidogrel alone was compared between the three treatment groups. Results showed that in patients taking aspirin and clopidogrel, the incidence of aspirin resistance was significantly decreased from 40% in PBO-treated patients to 9% in the 400 mg TCT group and 25% in the TCT 800 mg group (P = .03). In conclusion, patients on aspirin and clopidogrel had a higher incidence of aspirin resistance than all patients treated with aspirin alone and TCT decreased the frequency of aspirin resistance in this group.

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Vitamin E Deficiency

Tyler R. Kemnic, Meghan Coleman

In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2020 Jan. 2020 Jul 10.

Excerpt

Vitamin E is all the following eight compounds alpha, beta, gamma, and delta-tocopherol and alpha, beta, gamma, and delta-tocotrienol. Alpha-tocopherol is the only compound of the eight that are known to meet human dietary needs. All of the vitamin E forms are absorbed in the small intestine, and then the liver metabolizes only alpha-tocopherol. The liver then removes and excretes the remaining vitamin E forms. Vitamin E deficiency is extremely rare in humans as it is unlikely caused by a diet consisting of low vitamin E. Rather, it tends to be caused by irregularities in dietary fat absorption or metabolism. Vitamin E is a lipid-soluble nutrient. Vitamin E may have a role in reducing atherosclerosis and lowering rates of ischemic heart disease. Premature infants have low vitamin E reserves due to vitamin E only able to cross the placenta in small amounts.

Inflammatory Diseases and Vitamin E – What Do We Know and Where Do We Go?

Maria Wallert, Lisa Börmel, Stefan Lorkowski

Mol Nutr Food Res . 2020 Jul 21;e2000097. doi: 10.1002/mnfr.202000097. Online ahead of print.

Abstract

Inflammation-driven diseases and related comorbidities, such as the metabolic syndrome, obesity, fatty liver disease and cardiovascular diseases cause significant global burden. There is a growing body of evidence that nutrients alter inflammatory responses and can therefore make a decisive contribution to the treatment of these diseases. Recently, the inflammasome, a cytosolic multiprotein complex, was identified as a key player in inflammation and the development of various inflammation-mediated disorders, with nucleotide-binding domain and leucine-rich repeat pyrin domain (NLRP) 3 being the inflammasome of interest. Here we provide an overview about the cellular signaling pathways underlying nuclear factor ‘kappa-light-chain-enhancer’ of activated B-cells (NF-κB)- and NLRP3-mediated inflammatory processes, the pathogenesis of the inflammatory diseases atherosclerosis and non-alcoholic fatty liver disease (NAFLD); next, we discuss the current state of knowledge for drug-based and dietary-based interventions for treating cardiovascular diseases and NAFLD. To date one of the most important antioxidant in the human diet is vitamin E. Various in vitro and in vivo studies suggest that the different forms of vitamin E and also their derivatives have anti-inflammatory activity. Recent publications suggest that vitamin E – and possibly metabolites of vitamin E – are a promising therapeutic approach for treating inflammatory diseases such as NAFLD.

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Comparative Efficacy of Vitamin Supplements on Prevention of Major Cardiovascular Disease: Systematic Review With Network Meta-Analysis

Ji Han, Chunyang Zhao, Jiayi Cai, Yu Liang

Complement Ther Clin Pract . 2020 May;39:101142. doi: 10.1016/j.ctcp.2020.101142. Epub 2020 Mar 14.

Abstract

Background: Vitamins are commonly used in the prevention of major cardiovascular disease. However, the efficacy and optimum choice remain controversial.

Objective: To compare and rank the relative efficacy among all available vitamin preparations for cardiovascular disease through a network meta-analysis.

Methods: Eligible studies were identified by searching PubMed, Embase, Medline, Cochrane library and Web of Science for randomized controlled trials. A random effects model was applied within a frequentist framework.

Results: Forty-two articles (45 comparisons, 384,248 participants), including nine vitamin interventions, were identified. Vitamin D had the highest probability of being ranked best in effectiveness (0.84 [0.72, 0.98]) on prevention of cardiovascular events. With regard to reducing death of cardiovascular disease rate, vitamin E was considered better efficacy.

Conclusions: Vitamin B, D and E could reduce the incidence of cardiovascular events to varying degrees. At the same time, the combination of vitamins can not show improvement on the efficacy.

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High-throughput Profiling Reveals Perturbation of Endoplasmic Reticulum Stress-Related Genes in Atherosclerosis Induced by High-Cholesterol Diet and the Protective Role of Vitamin E

Perinur Bozaykut, Ruchan Ekren, Osman Ugur Sezerman, Vadim N Gladyshev, Nesrin Kartal Ozer

Biofactors . 2020 May 8. doi: 10.1002/biof.1635.

Abstract

Formation of atherosclerotic plaques, called atherogenesis, is a complex process affected by genetic and environmental factors. It was proposed that endoplasmic reticulum (ER) stress is an important factor in the pathogenesis of atherosclerosis and that vitamin E affects atherosclerotic plaque formation via its antioxidant properties. Here, we investigated ER stress-related molecular mechanisms in high-cholesterol diet (HCD, 2%)-induced atherosclerosis model and the role of vitamin E supplementation in it, beyond its antioxidant properties. The consequences of HCD and vitamin E supplementation were examined by determining protein levels of ER stress markers in aortic tissues. As vitamin E supplementation acts on several unfolded protein response (UPR) factors, it decreased ER stress induced by HCD. To elucidate the associated pathways, gene expression profiling was performed, revealing differentially expressed genes enriched in ER stress-related pathways such as the proteasome and the apoptosis pathways. We further assessed the proteasomal activity impaired by HCD in the aorta and showed that vitamin E reversed it to that of control animals. Overall, the study characterized the effects of HCD and vitamin E on ER stress-related gene expression, revealing the role of proteolytic systems during atherogenesis.

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Impact of Vitamin E Supplementation on Vascular Function in Haptoglobin Genotype Stratified Diabetes Patients (EVAS Trial): A Randomised Controlled Trial

Rinkoo Dalan, Liuh Ling Goh, Chien Joo Lim, Aruni Seneviratna, Huiling Liew, Cherng Jye Seow, Lian Xia, Daniel E K Chew, Melvin K S Leow, Bernhard O Boehm

Nutr Diabetes . 2020 Apr 27;10(1):13. doi: 10.1038/s41387-020-0116-7.

Abstract

Aims: Vitamin E (Vit-E) may preferentially improve cardiovascular risk in haptoglobin 2-2 (Hp2-2) genotype diabetes individuals. We studied the impact of Vit-E supplementation on vascular function in diabetes individuals stratified by haptoglobin genotype in Singapore.

Methods: In this 24-week, double blind, placebo-controlled RCT, we recruited 187 subjects (101 Hp2-2, 86 non-Hp2-2).

Intervention: alpha-tocopherol-400 IU.

Primary outcome: Change in EndoPAT-derived reactive-hyperaemia index (RHI) and augmentation index (AIx); Secondary Outcomes: Pulse-Wave velocity (Sphygmocor-PWV), carotid intima media thickness (CIMT), inflammation (hsCRP), derivatives of reactive-oxygen metabolites (dROMs), biological antioxidant-potential (BAPs), HbA1c, LDL-C, HDL-C and oxidised LDL-C (ox-LDL).

Results: Overall, with Vit-E supplementation no significant change in RHI, PWV, CIMT, hsCRP, dROMS, BAPs, HDL-C and HbA1c was observed (p > 0.05); an increase in LDL-C with concomitant decrease in ox-LDL, and incidentally increase in eGFR was observed (p < 0.05). No interaction effect with haptoglobin genotype was seen for all outcomes (p > 0.05). Subgroup analysis: In the non-Hp-2-2 group, Vit-E supplementation led to a higher EndoPAT-derived AIx, accompanied by higher LDL and ox-LDL concentrations (p < 0.05); Hp2-2 group: Vit-E supplementation led to higher eGFR when compared to the non-Hp2-2 group (exploratory) (p < 0.05). We observed an interaction effect for baseline haptoglobin concentration (threshold > 119 mg/dl) with intervention in terms of increased EndoPAT-derived AIx in the Hp > 119 mg/dl group whereas no change in the group with Hp ≤ 119 mg/dl.

Conclusion: Vit-E supplementation did not show any preferential benefit or deleterious effect on vascular function in Hp2-2 diabetes subjects in Singapore. A possible deleterious effect of an increase in arterial stiffness in individuals with Hp > 119 mg/dl was observed. Future studies should consider personalisation based on baseline Hp concentrations in patients with T2DM rather than just Hp2-2 genotype to evaluate impact on the detailed lipid pathways, cardiac and renal physiology. The impact of ethnic differences needs to be explored in greater details.

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L-Carnitine and Vitamin E Ameliorate Cardiotoxicity Induced by Tilmicosin in Rats

Mohamed Aboubakr, Faten Elsayd, Ahmed Soliman, Sabreen Ezzat Fadl, Anwar El-Shafey, Ehab Yahya Abdelhiee

Environ Sci Pollut Res Int . 2020 Apr 23. doi: 10.1007/s11356-020-08919-6.

Abstract

The present study aimed to investigate the possible mitigating effect of L-carnitine (LC) and/or α-tocopherol (Vit. E) administration against tilmicosin (TIL)-induced cardiotoxicity in rats. Fifty-six male albino rats were divided into seven groups according to LC, Vit. E, and/or TIL administration. Control, LC, and Vit. E groups were given saline, 150 mg LC/kg body weight (BW)/day and 100 mg Vit. E/kg BW/day, respectively, orally once daily for 15 days. The TIL group was administered saline orally once daily for 15 days and a single dose of TIL (75 mg/kg BW) subcutaneously (SC) on day 14 from the starting of the experimental period (15 days). The TIL-LC, TIL-Vit. E, and TIL-LC-Vit. E groups received 150 mg LC/kg BW/day, 100 mg Vit. E/kg BW/day, and 150 mg LC/kg BW pulse 100 mg Vit. E/kg BW, respectively, orally once daily for 15 days with TIL as described above. The results revealed that the administration of TIL significantly (P ≤ 0.05) raised serum activities of heart injury indicators, lactate dehydrogenase (LDH), creatine kinase (CK), and CK-MB with substantial increase (P ≤ 0.05) in the cardiac contents of malondialdehyde (MDA) and decreased in antioxidants. The pathological changes appeared in the form of necrotic muscle fibers and massive inflammatory cellular infiltrations in the cardiac muscle and increased the caspase-3 immunohistochemical expression in the heart tissues as well. These changes were ameliorated by LC and/or Vit. E administration. In conclusion, supplementation of LC and/or Vit. E ameliorated the cardiotoxicity of the TIL SC injection in the rat.

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The Effect of Vitamin Supplementation on Subclinical Atherosclerosis in Patients without Manifest Cardiovascular Diseases: Never-ending Hope or Underestimated Effect?

Mitu O, Cirneala IA, Lupsan AI, Iurciuc M4, Mitu I, Dimitriu DC, Costache AD, Petris AO, Costache II

Molecules. 2020 Apr 9;25(7). pii: E1717. doi: 10.3390/molecules25071717.

Abstract

Micronutrients, especially vitamins, play an important role in the evolution of cardiovascular diseases (CVD). It has been speculated that additional intake of vitamins may reduce the CVD burden by acting on the inflammatory and oxidative response starting from early stages of atherosclerosis, when the vascular impairment might still be reversible or, at least, slowed down. The current review assesses the role of major vitamins on subclinical atherosclerosis process and the potential clinical implications in patients without CVD. We have comprehensively examined the literature data for the major vitamins: A, B group, C, D, and E, respectively. Most data are based on vitamin E, D and C supplementation, while vitamins A and B have been scarcely examined for the subclinical atherosclerosis action. Though the fundamental premise was optimistic, the up-to-date trials with vitamin supplementation revealed divergent results on subclinical atherosclerosis improvement, both in healthy subjects and patients with CVD, while the long-term effect seems minimal. Thus, there are no conclusive data on the prevention and progression of atherosclerosis based on vitamin supplementation. However, given their enormous potential, future trials are certainly needed for a more tailored CVD prevention focusing on early stages as subclinical atherosclerosis.

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