The effects of tocotrienol supplementation on lipid profile: A meta-analysis of randomized controlled trials

Shuping Zuo, Guiping Wang, QuanLe Han, Hongling Xiao, Heitor O Santos, David Avelar Rodriguez, Vahid Khani, Jianlei Tang

Complement Ther Med . 2020 Aug;52:102450. doi: 10.1016/j.ctim.2020.102450. Epub 2020 May 25.

Abstract

Background & objective: Tocotrienol supplementation has been emerged as a potent candidate for the treatment of dyslipidemia. In the present study, a systematic review and meta-analysis of randomized controlled trials was performed with the aim of examining the effects of tocotrienol supplementation on the lipid profile.

Methods: Four databases (Scopus, PubMed/Medline, Web of Science and Embase) were used to accomplish the literature search up to November 2019. Clinical trials encompassing the impact of tocotrienol supplementation on lipid profile were extracted regardless of clinical condition, with studies included involving only adults patients.

Results: A total of 15 articles with 20 arms were eligible and included in the meta-analysis to estimate the pooled effect size. Overall results showed a significant effect of tocotrienol supplementation on increasing high-density lipoprotein cholesterol (HDL-C) levels (weight mean difference (WMD): 0.146 mmol/L, I2 = 85.9%) and a non-significant influence on total cholesterol (TC) (WMD: 0.010 mmol/L, I2 = 64.5%), low-density lipoprotein cholesterol (LDL-C) (WMD: 0.095 mmol/L, I2 = 87.4%), and triglycerides (TG) (WMD: -0.112 mmol/L, I2 = 67.4%) levels. Increment in HDL-C levels was significant greater for the tocotrienol dosage ≥ 200 mg/d (WMD: 0.202 mmol/L) and ≤8 weeks (WMD: 0.278 mmol/L). Moreover, studies that investigated tocotrienol dose ≥200 mg had no heterogeneity, while showing a significant decrease in TG levels (WMD: -0.177 mmol/L).

Conclusion: The present meta-analysis demonstrated that supplementing with tocotrienols does not decrease the concentrations of LDL-C, TC and TG. However, tocotrienol supplementation was considered a candidate for increasing HDL-C levels.

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Multifunctional activity of vitamin E in animal and animal products: A review

Emrobowansan M Idamokoro, Andrew B Falowo, Chika E Oyeagu, Anthony J Afolayan

Anim Sci J . Jan-Dec 2020;91(1):e13352. doi: 10.1111/asj.13352.

Abstract

Vitamin E is an essential nontoxic fat-soluble micronutrient whose effects on livestock performance and products can be attributed to its antioxidant and nonantioxidant properties. Although it is needed in small quantity in the diet, its roles in livestock production are indispensable as it is required in boosting performance, nutritional qualities, and yield of animal and animal products. The dietary or oral supplementation of vitamin E is essential in reducing lipid oxidation in muscle, egg, and dairy products as well as lowering cholesterol concentrations and improving antioxidant status of livestock. Evidence has shown that bioavailability of vitamin E-enriched animal products could serve as an invaluable nutritional benefit to consumers; especially those in regions of limited resources where vitamin E deficiencies pose a risk that may be detrimental to some cellular activities of the body and on human health. It is therefore important to redirect research on the impact of vitamin E supplementation as antioxidant on livestock performance and animal products.

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Pyrethroid-Induced Organ Toxicity and Anti-Oxidant-Supplemented Amelioration of Toxicity and Organ Damage: The Protective Roles of Ascorbic Acid and α-Tocopherol

Mohsen S Al-Omar, Mamuna Naz, Salman A A Mohammed, Momina Mansha, Mohd N Ansari, Najeeb U Rehman, Mehnaz Kamal, Hamdoon A Mohammed, Mohammad Yusuf, Abubaker M Hamad, Naseem Akhtar, Riaz A Khan

Int J Environ Res Public Health . 2020 Aug 25;17(17):E6177. doi: 10.3390/ijerph17176177.

Abstract

The pyrethroid toxicants, fatal at high doses, are found as remnants of crop pesticides and ingredients of commercially available insecticides. The toxic effects of high-content insecticidal pyrethroid formulations are available in 0.05 g, 1.17 g, and 0.04 g pyrethroid-instilled products, namely burning coils, pyrethroid-soaked mats, and liquid formulations of pyrethroids that release pyrethroid vapor/smoke upon heating. They provided 5.46 g/kg, 21.15 g/kg, and 4.24 g/kg of toxicants to the experimental animals over a total of 3 weeks/5 h per os (p.o.) administration, producing necrosis, hyperemia, and fatty changes in the liver; fiber separation in cardiac muscles; atrophy, lymphatic infiltration, blood vessel congestion, and hyperemia in the heart tissues of the experimental animals. The glomerular tuft necrosis, cytoplasmic degeneration of renal tubular cells, necrotic tubules, congestion, and dilatation of blood vessels were observed in the kidney tissue of intoxicated animals. Air-space enlargement, interstitial inflammation, lymphocyte infiltration aggregates, connective tissue infiltration by inflammatory cells, and hyperemia were found in the lung tissues. The pyrethroid toxicants also produced nervous tissue degeneration and decreased neurons in the brain, which were observed through histopathological examinations of the brain, lungs, heart, kidneys, and liver. The protective effects of ascorbic acid (AA/vitamin C) and α-tocopherol (E307/vitamin E) at 100 mg/kg oral doses administered daily for the entire period of the toxicant exposure of three weeks to the experimental mice, aged between 3-4 months and weighing ≈30 g, ameliorated the tissue damage, as observed through the histopathological examinations. The ascorbic acid caused recovery of the liver, kidney, brain, and heart tissue damage, while α-tocopherol was effective at ameliorating the damage in the kidneys and lung tissue compared with the control groups. The high levels of tissue damage recovery suggested a prophylactic effect of the concurrent use of ascorbic acid and α-tocopherol for the subjects under the exposure of pyrethroids.

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Antioxidant Effect Of Vitamin E On Carbon Tetrachloride Induced Tubulointerstitial And Glomerular Damage In The Kidneys Of Albino Mice

Shabnum Aamir, Zia Ud Din, Zahid Sarfaraz Khan, Humaira Imtiaz, Faheem Ul Haq, Hajira Ishaq

J Ayub Med Coll Abbottabad . Jul-Sep 2020;32(3):295-298.

Abstract

Background: Chemical induced nephrotoxicity is one of the main causes of acute kidney injury. The objective of this study was to determine the antioxidant effect of vitamin E against carbon tetrachloride induced tubulointerstitial and glomerular damage in the kidney of albino mice.

Methods: The study had been conducted on albino mice. The duration of study was for five weeks. A total of 35 animals were randomly divided into five groups A, B, C, D and E .The group A served as control group, group B was administered only with carbon tetrachloride (no vitamin E) and groups C, D and E received test drug (vitamin E) in doses of 1, 10 and 50mg/kg body weight respectively along with CCl4. The animals were dissected and kidneys were excised for microscopic study for possible histo-morphological effects.

Results: It was observed that carbon tetrachloride treated experimental groups developed tubulo-interstitial and glomerular changes as compared to control group A. The results suggested that these changes were significantly reduced in vitamin E treated groups especially in dose of 50 mg/kg body weight.

Conclusions: This study reveals that tubulointerstitial and glomerular damage caused by carbon tetrachloride can be reduced by vitamin E in dose of 50 mg/kg body weight.

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Effects of pomegranate peel extract and vitamin E on the inflammatory status and endothelial function in hemodialysis patients: a randomized controlled clinical trial

Tina Jafari, Aziz A Fallah, Ali Reyhanian, Elham Sarmast

Food Funct . 2020 Aug 25. doi: 10.1039/d0fo01012j. Online ahead of print.

Abstract

Inflammation and endothelial dysfunction are major problems in hemodialysis (HD) patients. This study assessed the effects of an 8 week administration of pomegranate peel extract (PPE) and vitamin E (Vit E) alone or in combination on the biomarkers of inflammation, including C-reactive protein (CRP), interleukin-6 (IL-6), and tumor necrosis factor-alpha (TNF-α), and the biomarkers of endothelial function, including intercellular adhesion molecule-1 (ICAM-1), vascular cell adhesion molecule-1 (VCAM-1), and P-selectin, in HD patients. In a randomized, double-blind, parallel, placebo-controlled trial, 100 HD patients were randomly divided into 4 equal groups: (a) PPE + Vit E, received 2 pomegranate tablets (each tablet contained 225 mg PPE, equal to 90 mg ellagic acid) + 1 Vit E soft gel (400 IU) daily, (b) PPE, received 2 pomegranate tablets + 1 Vit E placebo soft gel daily, (c) Vit E, received 1 Vit E soft gel + 2 pomegranate placebo tablets daily, and (d) placebo, received 2 pomegranate placebo tablets + 1 Vit E placebo soft gel daily. For group allocation, a stratified block randomization procedure based on sex, age, and HD duration was used. Each intervention product and its placebo had identical shape, color, size, and packaging. Consumption of PPE + Vit E significantly reduced the serum CRP level (mean change: -7.12 ± 4.59 mg l-1, P < 0.001) compared to other groups, while reduced levels of IL-6 (mean change: -2.19 ± 2.33 pg ml-1, P < 0.001), TNF-α (mean change: -2.41 ± 3.21 pg ml-1, P = 0.008), ICAM-1 (mean change: -64.2 ± 111.0 ng ml-1, P = 0.017), and VCAM-1 (mean change: -117.7 ± 177.1 ng ml-1, P = 0.002) were observed compared to the control. There was no significant difference in the P-selectin level among the groups. Consumption of PPE or Vit E alone significantly reduced the CRP level (mean change for PPE: -3.58 ± 5.41 mg l-1, P < 0.001; mean change for Vit E: -3.25 ± 8.29 mg l-1, P = 0.002) compared to the control. As a result, consumption of PPE in combination with Vit E enhanced the inflammatory status and endothelial function in HD patients.

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Brain tocopherol levels are associated with lower activated microglia density in elderly human cortex

Francisca A de Leeuw, Julie A Schneider, Sonal Agrawal, Sue E Leurgans, Martha Clare Morris

Alzheimers Dement (N Y) . 2020 Aug 24;6(1):e12021. doi: 10.1002/trc2.12021. eCollection 2020.

Abstract

Introduction: Higher brain tocopherol levels have been associated with lower levels of Alzheimer’s disease (AD) neuropathology; however, the underlying mechanisms are unclear.

Methods: We studied the relations of α- and γ-tocopherol brain levels to microglia density in 113 deceased participants from the Memory and Aging Project. We used linear regression analyses to examine associations between tocopherol levels and microglia densities in a basic model adjusted for age, sex, education, apolipoprotein E (APOE)ε4 genotype (any ε4 allele vs. none) , and post-mortem time interval, and a second model additionally adjusted for total amyloid load and neurofibrillary tangle severity.

Results: Higher α- and γ-tocopherol levels were associated with lower total and activated microglia density in cortical but not in subcortical brain regions. The association between cortical α-tocopherol and total microglia density remained statistically significant after adjusting for AD neuropathology.

Discussion: These results suggest that the relation between tocopherols and AD might be partly explained by the alleviating effects of tocopherols on microglia activation.

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A vitamin E blended highly cross-linked polyethylene acetabular cup results in less wear: 6-year results of a randomized controlled trial in 199 patients

Julie R A Massier, Joost H J Van Erp, Thom E Snijders, Arthur DE Gast

Acta Orthop . 2020 Aug 24;1-6. doi: 10.1080/17453674.2020.1807220. Online ahead of print.

Abstract

Background and purpose – Survivorship of total hip arthroplasty (THA) with the ultra-high molecular weight polyethylene (UHMWPE) monoblock cup has been limited due to periprosthetic osteolysis and aseptic loosening, secondary to wear of the UHMWPE. In response, a vitamin E blended highly cross-linked polyethylene (HXLPE) cup was developed. This study set out to compare the wear and clinical 6-year outcomes of vitamin E blended HXLPE with UHMWPE in an isoelastic monoblock cup in patients with hip osteoarthritis who underwent uncemented THA. The 2-year results have been reported previously.Patients and methods – For this randomized controlled trial 199 patients were included. 102 patients received the vitamin E blended HXLPE uncemented acetabular cup and 97 patients the uncemented UHMWPE monoblock cup. Clinical and radiographic parameters were obtained preoperatively, directly postoperatively, and at 3, 12, 24, and 72 months. Wear rates were compared using the femoral head penetration (FHP) rate.Results – 173 patients (87%) completed the 6-year follow-up. The mean NRS scores for rest pain, load pain, and patient satisfaction were 0.3 (SD 1), 0.6 (SD 1), and 8.6 (SD 1) respectively. The mean Harris Hip Score was 93 (SD 12). The FHP rate was lower in the vitamin E blended HXLPE cup (0.028 mm/year) compared with the UHMWPE cup (0.035 mm/year) (p = 0.002). No adverse reactions associated with the clinical application of vitamin E blended HXLPE were observed. 15 complications occurred, equally distributed between the two cups. The 6-year survival to revision rate was 98% for both cups. There was no aseptic loosening.Interpretation – This study shows the superior performance of the HXLPE blended with vitamin E acetabular cup with clinical and radiographic results similar to the UHMWPE acetabular cup.

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Dose-Dependent Pulmonary Toxicity of Aerosolized Vitamin E Acetate

Shotaro Matsumoto, Xiaohui Fang , Maret G Traber, Kirk D Jones, Charles Langelier, Paula Hayakawa Serpa, Carolyn S Calfee, Michael A Matthay, Jeffrey E Gotts

Am J Respir Cell Mol Biol . 2020 Aug 21. doi: 10.1165/rcmb.2020-0209OC. Online ahead of print.

Abstract

E-cigarette, or vaping, product use-associated lung injury (EVALI) is a syndrome of acute respiratory failure characterized by monocytic and neutrophilic alveolar inflammation. Epidemiological and clinical evidence suggests a role of Vitamin E acetate (VEA) in the development of EVALI, yet it remains unclear whether VEA has direct pulmonary toxicity. To test the hypotheses that aerosolized VEA causes lung injury in mice and directly injures human alveolar epithelial cells, we exposed adult mice and primary human alveolar epithelial type II (AT II) cells to an aerosol of VEA generated by a device designed for vaping oils. Outcome measures in mice included lung edema, bronchoalveolar lavage (BAL) analysis, histology, and inflammatory cytokines; in vitro outcomes included cell death, cytokine release, cellular uptake of VEA, and gene expression analysis. Comparison exposures in both models included the popular nicotine-containing JUUL aerosol. We discovered that VEA caused dose-dependent increases in lung water and BAL protein compared to control and JUUL-exposed mice in association with increased BAL neutrophils, oil-laden macrophages, multinucleated giant cells, and inflammatory cytokines. VEA aerosol was also toxic to AT II cells, causing increased cell death and the release of monocyte and neutrophil chemokines. VEA was directly absorbed by AT II cells, resulting in the differential gene expression of several inflammatory biological pathways. Given the epidemiological and clinical characteristics of the EVALI outbreak, these results suggest that VEA plays an important causal role.

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Gamma-Tocotrienol loaded liposomes as radioprotection from hematopoietic side effects caused by radiotherapeutic drugs

Sang-Gyu Lee, Teja Muralidhar Kalidindi, Hanzhi Lou, Kishore Gangangari, Blesida Punzalan, Ariana Bitton 2, Casey Lee, Soobin Park, Lisa Bodei, Michael Kharas, Vijay K Singh, NagaVaraKishore Pillarsetty, Steven M Larson

J Nucl Med . 2020 Aug 21;jnumed.120.244681. doi: 10.2967/jnumed.120.244681. Online ahead of print.

Abstract

Rationale: With the successful development and increased use of targeted radionuclide therapy for treating cancer comes the increased risk of radiation injury to bone marrow-both direct suppression and stochastic effects, leading to neoplasia. Herein, we report a novel radioprotector drug, a liposomal formulation of gamma-tocotrienol (GT3), or GT3-Nano for short, to mitigate bone marrow radiation damage during targeted radionuclide therapy (TRT). Methods: GT3 was loaded into liposomes using passive loading. [64Cu]-GT3-Nano and 3H-GT3-Nano were synthesized to study the in vivo biodistribution profile of the liposome and GT3 individually. Radioprotection efficacy of GT3-Nano was assessed after acute 137Cs whole-body irradiation at sublethal (4 Gy), lethal (9 Gy), or single high-dose [153Sm]-EDTMP administration. Flow cytometry was used to analyze hematopoietic cell population dynamics and fluorescence microscopy was used to assess the cellular site of GT3-Nano localization in the spleen and bone marrow. Results: Bone marrow uptake and retention of [64Cu]-GT3-Nano was 6.98 ± 2.34 %ID/g, while [3H]-GT3-Nano uptake and retention was 7.44 ± 2.52 %ID/g at 24 h, respectively. GT3-Nano administered 24 hours before or after 4 Gy TBI promoted rapid and complete hematopoietic recovery while recovery of controls stalled at 60%. GT3-Nano demonstrated dose-dependent radioprotection, achieving 90% survival at 50 mg/kg against lethal 9 Gy TBI. Flow cytometry of bone marrow indicated progenitor bone marrow cells MPP2 and CMP cells were upregulated in GT3-Nano-treated mice. Immunohistochemistry showed that GT3-Nano accumulates in CD105-positive sinusoid epithelial cells. Conclusion: GT3-Nano is highly effective in mitigating marrow suppressive effects of sub-lethal and lethal TBI in mice. GT3-Nano can aid in rapid recovery of hematopoietic components in mice treated with the endoradiotherapeutic agent [153Sm]-EDTMP.

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Protective effect of hypothermia and vitamin E on spermatogenic function after reduction of testicular torsion in rats

Xuejun Bo, Ping Wang, Yan Nie, Rongfen Li, Jiru Lu, Haiying Wang

Exp Ther Med . 2020 Aug;20(2):796-801. doi: 10.3892/etm.2020.8800. Epub 2020 May 27.

Abstract

This study was designed to investigate the protective effect of hypothermia and vitamin E on spermatogenic function after reduction of testicular torsion in rats. Ninety-six pure inbred male SD rats were divided into group A, B, C and D according to the principle of body weight and birth similarity, with 24 rats in each group. Four groups of rats were respectively twisted on the left testis to establish unilateral testicular torsion rats. Rats in groups A, B, C, D were respectively given normal saline, hypothermia therapy, vitamin E therapy, and hypothermia and vitamin E therapy. The superoxide dismutase (SOD) activity and malondialdehyde (MDA) content of the four groups were detected, and the correlation levels of inflammatory factors IL-1β, hs-CRP and related sex hormones luteinizing hormone (LH), follicle-stimulating hormone (FSH), total testosterone (T) were detected by ELISA. Apoptosis of spermatogenic cells of testis in the four groups was detected by flow cytometry. SOD activity and MDA content in groups B, C and D were significantly higher than those in group A, MDA content was significantly lower than that in group A (P<0.05), SOD activity in group D was higher than that in groups B and C, while MDA content was lower than that in groups B and C (P<0.05). The levels of IL-1β and hs-CRP in group A were much higher than those in groups B, C and D (P<0.05). LH and FSH levels in group A were significantly higher than those in groups B, C and D (P<0.05), and in group D were significantly lower than those in groups B and C (P<0.05). Apoptosis rate of spermatogenic cells in group A was significantly higher than that in groups B, C and D (P<0.05). Hypothermia combined with vitamin E can reverse testicular injury in rats and reduce the apoptosis rate of spermatogenic cells.

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