Effect of Vitamin E Supplementation during Buffalo Semen Cryopreservation on Sperm Characteristics and Oxidative Stress

Abstract Background: Vitamin E supplementation has been recommended for persons with familial hypobetalipoproteinemia (FHBL), a rare disorder of lipoprotein metabolism that leads to low serum α-tocopherol and decreased LDL-cholesterol and apolipoprotein (apo) B. We examined the effect of truncated apoB variants on vitamin E metabolism and oxidative stress in persons with FHBL. Methods: We studied 9 individuals with heterozygous FHBL [mean (SE) age, 40 (5) years; body mass index (BMI), 27 (10) kg/m2] and 7 normolipidemic controls [age, 41 (5) years; BMI, 25 (2) kg/m2]. We also studied 3 children—2 with homozygous FHBL (apoB-30.9) and 1 with abetalipoproteinemia—who were receiving α-tocopherol supplementation. We used HPLC with electrochemical detection to measure α- and γ-tocopherol in serum, erythrocytes, and platelets, and gas chromatography–mass spectrometry to measure F2-isoprostanes and tocopherol metabolites in urine as markers of oxidative stress and tocopherol intake, respectively. Results: Compared with controls, persons with FHBL had significantly lower fasting plasma concentrations of total cholesterol [2.4 (0.2) vs 4.7 (0.2) mmol/L], triglycerides [0.5 (0.1) vs 0.9 (0.1) mmol/L], LDL-cholesterol [0.7 (0.1) vs 2.8 (0.3) mmol/L], apoB [0.23 (0.02) vs 0.84 (0.08) g/L], α-tocopherol [13.6 (1.0) vs 28.7 (1.4) μmol/L], and γ-tocopherol [1.0 (0.1) vs 1.8 (0.3) μmol/L] (all P <0.03). Erythrocyte α-tocopherol was decreased [5.0 (0.2) vs 6.0 (0.3) μmol/L; P <0.005], but we observed no differences in lipid-adjusted serum tocopherols, erythrocyte γ-tocopherol, platelet α- or γ-tocopherol, urinary F2-isoprostanes, or tocopherol metabolites. Conclusion: Taken together, our findings do not support the recommendation that persons with heterozygous FHBL receive vitamin E supplementation.

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Beneficial Effects of Vitamin E Supplementation on Endothelial Dysfunction, Inflammation, and Oxidative Stress Biomarkers in Patients Receiving Hemodialysis: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

International Journal of Molecular Sciences ◽

10.3390/ijms222111923 ◽

2021 ◽

Vol 22 (21) ◽

pp. 11923

Author(s):

Thi Thuy Uyen Nguyen ◽

Ji-hyun Yeom ◽

Won Kim

Keyword(s):

Oxidative Stress ◽

Systematic Review ◽

Vitamin E ◽

Meta Analysis ◽

Controlled Trials ◽

Oxidative Stress Biomarkers ◽

Randomized Controlled ◽

Stress Biomarkers ◽

And Oxidative Stress ◽

Vitamin E Supplementation

Inflammation and oxidative stress are closely related to cardiovascular complications and atherosclerosis, and have the potential to lead to an increase in death in patients receiving hemodialysis. Vitamin E has antioxidant and anti-inflammatory properties. We conducted a systematic review and meta-analysis to assess the effects of vitamin E supplementation on endothelial dysfunction, inflammation, and oxidative stress biomarkers in adult patients receiving hemodialysis. We searched the MEDLINE, EMBASE, Web of Science, and Cochrane Library databases and identified randomized controlled trials of adult patients receiving hemodialysis until 30 August 2021. A total of 11 trials with 491 randomized patients were included. The pooled data indicated that vitamin E supplementation significantly decreased intercellular adhesion molecule-1 [standardized mean difference (SMD): −1.35; 95% confidence interval (CI): −2.57, −0.13; p = 0.03, I2 = 89%], vascular cell adhesion molecule-1 (SMD: −1.08; 95% CI: −2.05, −0.11; p = 0.03, I2 = 81%), C-reactive protein (SMD: −0.41; 95% CI: −0.75, −0.07; p = 0.02, I2 = 64%), and malondialdehyde (SMD: −0.76; 95% CI: −1.26, −0.25; p = 0.003, I2 = 77%) levels, but not interleukin-6 levels compared to those in the control group. Our results suggest that vitamin E supplementation may help alleviate oxidative stress and both vascular and systemic inflammation in patients receiving hemodialysis.

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Lower dietary n-6 : n-3 ratio and high-dose vitamin E supplementation improve sperm morphology and oxidative stress in boars

Reproduction Fertility and Development ◽

10.1071/rd15424 ◽

2017 ◽

Vol 29 (5) ◽

pp. 940 ◽

Cited By ~ 4

Author(s):

Qing Liu ◽

Yuanfei Zhou ◽

Runjia Duan ◽

Hongkui Wei ◽

Siwen Jiang ◽

...

Keyword(s):

Oxidative Stress ◽

Vitamin E ◽

Antioxidant Capacity ◽

Sperm Morphology ◽

Tocopherol Content ◽

High Dose ◽

Beneficial Effects ◽

And Oxidative Stress ◽

High Dose Vitamin ◽

Vitamin E Supplementation

A 2 × 2 factorial experiment (10 boars per treatment) was conducted for 16 weeks to evaluate the effects of the dietary n-6 : n-3 ratio (14 : 1 vs 6 : 1) and vitamin E (200 vs 400 mg kg–1) on boar sperm morphology and oxidative stress. Sperm mitochondrial membrane potential (MMP), reactive oxygen species (ROS), DNA damage (8-hydroxydeoxyguanosine; 8-OHdG), seminal lipoperoxidation (malondialdehyde; MDA) and antioxidant capacity in the serum, spermatozoa and seminal plasma were assessed as indicators of oxidative stress. Sperm production was similar among groups but increased (P < 0.05) throughout the 16 weeks of the study. Although sperm α-tocopherol content, ROS and seminal MDA did not differ between the two dietary n-6 : n-3 ratio treatments, enhanced antioxidant enzyme activity and MMP, but decreased 8-OHdG, were found in spermatozoa from boars consuming the 6 : 1 diet. The diet with the 6 : 1 ratio positively affected sperm morphology at Weeks 12 and 16 (P < 0.05). The α-tocopherol content and antioxidant capacity increased in boars with increasing levels of vitamin E supplementation. Compared with low-dose vitamin E, high-dose vitamin E supplementation improved sperm morphology. Overall, the results indicate that an n-6 : n-3 ratio of 6 : 1 and 400 mg/kg vitamin E have beneficial effects on sperm morphology by improving antioxidative stress.

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