Preservation of the endogenous antioxidants in low density lipoprotein by ascorbate but not probucol during oxidative modification.

Jialal, I.; Grundy, Scott M.

doi:10.1172/jci115035

Cited by 208 publications

(70 citation statements)

References 48 publications

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“…Vitamin C protects low-density lipoproteins ex vivo against oxidation and may function similarly in the blood. 49 Vitamin C plays an important role in the production of collagen. Collagen gives your skin elastic properties.…”

Section: Natural Antioxidantsmentioning

confidence: 99%

Antioxidants: An Overview on the Natural and Synthetic Types

Atta¹,

Mohamed²,

Abdelgawad³

2017

ECB

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Section: Natural Antioxidantsmentioning

confidence: 99%

Antioxidants: An Overview on the Natural and Synthetic Types

Atta¹,

Mohamed²,

Abdelgawad³

2017

ECB

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“…Vitamin C [(+)-sodium L-ascorbate] was dissolved in sterile deionized water. In the experimental studies, the average antioxidant dose of vitamin C in vitro was determined to be 50 µM [20,31]. Accordingly, this concentration of vitamin C was added along with BPA to the culture medium.…”

Section: Hepatocyte Culture and Exposurementioning

confidence: 99%

Antioxidant defense system parameters in isolated fish hepatocytes exposed to bisphenol A — Effect of vitamin C

Kaya¹,

Kaptaner²

2016

Acta Biologica Hungarica

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In this study, isolated hepatocytes of pearl mullet (Alburnus tarichi) were exposed to bisphenol A (BPA) at concentrations of 25, 50, 100, and 200 µM for 24 h. Moreover, an in vitro antioxidant concentration of vitamin C (50 µM) was administrated to the culture medium along with the BPA exposures. Next, the antioxidant defense system parameters were analyzed. According to the results, the highest concentration of BPA (200 µM) proved to be severely toxic for the cells. The increased activities of superoxide dismutase (SOD) and glutathione-S-transferase (GST), the fluctuated activities of glutathione peroxidase (GPx), and the decreased content of reduced glutathione (GSH) were compared to the control group after the BPA exposures. Vitamin C co-administration was found to cause further increases in the SOD, GPx, and GST activities in some of the experimental groups and vitamin C could not restore the GSH content. Malondialdehyde (MDA) levels were observed to be unaffected in all exposure groups. These results show that BPA causes alterations in the antioxidant defenses of the isolated fish hepatocytes. In addition, vitamin C co-administration along with BPA was found to be non-protective against BPA-induced oxidative stress, consequently, aggravated a negative BPA impact.

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“…3 The evidence of the lipid peroxidation-inhibiting effects of vitamins E and C in vitro is plentiful. [1][2][3][4][5][6][7] In addition, oral vitamin E supplementation has consistently increased the oxidation resistance of isolated lipoproteins in vitro. 8 -13 Vitamin C has had been shown to have a similar effect in a few 14 -16 but not in all 17 studies.…”

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confidence: 99%

Long-Term Effects of Vitamin E, Vitamin C, and Combined Supplementation on Urinary 7-Hydro-8-Oxo-2′-Deoxyguanosine, Serum Cholesterol Oxidation Products, and Oxidation Resistance of Lipids in Nondepleted Men

Porkkala-Sarataho

Salonen

Nyyssönen

et al. 2000

ATVB

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Abstract-We studied the long-term effects of vitamins E and C and their combination on lipid peroxidation in vivo and in vitro. The Antioxidant Supplementation in Atherosclerosis Prevention (ASAP) trial is a double-masked placebo-controlled randomized clinical trial to study the effects of vitamin C (500 mg of slow release ascorbate per day), vitamin E (182 mg of RRR-␣-tocopherol acetate per day), and the combination of both antioxidants. Lipid peroxidation measurements were carried out for 48 male participants at entry and at 12 and 36 months. Compared with placebo, vitamin E and the vitamin combination increased plasma lipid-standardized ␣-tocopherol during the first 12 months by 68.2% and 65.2% (PϽ0.001 for both), respectively, and reduced serum 7␤-hydroxycholesterol by 50.4% (Pϭ0.013) and 44.0% (Pϭ0.041), respectively. The net change of lipid standardized ␣-tocopherol was 63.8% after 36 months of vitamin E supplementation and 43.3% for the combination. Vitamin C supplementation elevated plasma total ascorbate level by 30.1% (Pϭ0.043) in 12 months and by 91.1% (Pϭ0.001) in 36 months.Neither vitamin E, vitamin C, nor the combination influenced the urinary excretion rate of 7-hydro-8-oxo-2Ј-deoxyguanosine or the antioxidative capacity of plasma. Vitamin E and the combination of vitamins E and C enhanced the oxidation resistance of isolated lipoproteins and total serum lipids. Our data indicate that long-term supplementation of nondepleted men with a reasonable dose of vitamin E alone or in combination with slow release vitamin C reduces lipid peroxidation in vitro and in vivo, whereas a relatively high dose of vitamin C alone does not. Key Words: antioxidants Ⅲ lipid peroxidation Ⅲ oxidation resistance Ⅲ 7-hydro-8-oxo-2Ј-deoxyguanosine Ⅲ oxysterols V itamins E 1-4 and C 5,6 are widely regarded as important dietary antioxidants. However, this concept is based on in vitro studies and on supplementation trials in which only measurements of lipid peroxidation ex vivo have been performed. 3 The evidence of the lipid peroxidation-inhibiting effects of vitamins E and C in vitro is plentiful. [1][2][3][4][5][6][7] In addition, oral vitamin E supplementation has consistently increased the oxidation resistance of isolated lipoproteins in vitro. 8 -13 Vitamin C has had been shown to have a similar effect in a few 14 -16 but not in all 17 studies. Vitamin C can also act as a pro-oxidant in certain conditions. 17,18 In theory, vitamin E could function as a mediator of lipid peroxidation if sufficient coantioxidants are not present. 19,20 However, this theory has not been tested in oral supplementation studies with in vivo measurements. There are no previous long-term placebocontrolled oral supplementation trials concerning the effects of these vitamins on lipid peroxidation in nonsmoking clinically healthy subjects.The assessment of oxidative stress and lipid peroxidation in vivo in humans is problematic. 7-Hydro-8-oxo-2Ј-deoxyguanosine (8-oxodG), a repair product of oxidative damage to DNA, has been used as an indicator...

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Preservation of the endogenous antioxidants in low density lipoprotein by ascorbate but not probucol during oxidative modification.

Cited by 208 publications

References 48 publications

Antioxidants: An Overview on the Natural and Synthetic Types

Antioxidants: An Overview on the Natural and Synthetic Types

Antioxidant defense system parameters in isolated fish hepatocytes exposed to bisphenol A — Effect of vitamin C

Long-Term Effects of Vitamin E, Vitamin C, and Combined Supplementation on Urinary 7-Hydro-8-Oxo-2′-Deoxyguanosine, Serum Cholesterol Oxidation Products, and Oxidation Resistance of Lipids in Nondepleted Men

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