Oxidative Stress In Individuals Research Articles

Ongoing oxidative stress in individuals with post-acute sequelae of COVID-19.

Coronavirus disease 2019 (COVID-19) caused by SARS-CoV-2 infection is associated with lower plasma glutathione (GSH) levels due to oxidative stress. However, plasma levels may not reflect brain GSH levels. Individuals with post-acute sequelae of COVID-19 (PASC) have a higher prevalence of cognitive fatigue, which might be related to altered brain γ-aminobutyric-acid (GABA) levels. Hence, our study aims to measure the brain GSH and GABA levels in PASC. 29 PASC participants and 24 uninfected controls were recruited for this study. Each was evaluated with detailed neuropsychiatric assessments and an edited proton MRS (Hadamard Encoding and Reconstruction of Mega-Edited Spectroscopy, HERMES) method to measure GABA and GSH concentrations in predominantly grey matter (GM) and predominantly white matter (WM) brain frontal voxels. PASC participants were 219 ± 137 days since their COVID-19 diagnosis. Nine individuals with PASC were hospitalized. Compared to controls, individuals with PASC had similar levels of GABA in both brain regions, but lower GSH and greater age-related GSH decline in the frontal GM region. The lower-than-normal frontal GM GSH level in participants with PASC suggest that they have ongoing oxidative stress in the brain, and that older individuals may be even more vulnerable to oxidative stress.

Altered serum levels of melatonin, antioxidant enzymes and oxidative stress in individuals with diabetes mellitus type 2

Altered serum levels of melatonin, antioxidant enzymes and oxidative stress in individuals with diabetes mellitus type 2

Exposure to polycyclic aromatic hydrocarbon-induced oxidative stress in individuals living near restaurants: a cross-sectional study in Shiraz, Iran

Polycyclic aromatic hydrocarbons are environmental pollutants caused by the incomplete combustion of organic matter. The aim of this study was to investigate the concentration of urinary PAHs and their health effects in individuals living near restaurants. This cross-sectional study was done on 57 individuals who were living near 36 restaurants, and 30 individuals as the control group. Five urinary metabolites of PAHs (1-OH pyrene, 1-OH naphthalene, 2-OH naphthalene, 2-OH fluorine, and 9-OHphenanthrenen) were monitored. The total anti-oxidation capacity (TAC), malondialdehyde (MDA), C-reactive protein (CRP), and creatinine were also measured. The mean concentration of the sum of urinary PAHs (ΣOH-PAHs) was 1973.7, and 1687.61ng/g creatinine in people living near restaurants and control group, respectively. Among the metabolites, the highest mean concentration was related to 1-OH Pyrene in the two study groups. In the individuals living near restaurants, the concentration of PAH metabolites was directly related to MDA and TAC (p < 0.05 for both). The present study findings revealed no significant correlation between PAH metabolites and CRP in the two study groups (P > 0.05). People living near restaurants are more exposed to components in cooking fumes, which may adversely affect their health. Further researches are required to elucidate the effect of PAHs exposure on these individuals' health status.

Tear Lactate Levels as a Surrogate Marker of Oxidative Stress in Myopia: A Case-control Study

Introduction: Myopia is most common refractive error leading to visual dysfunctions worldwide. Oxygen deficit due to environmental stress leads to increase in anaerobic glycolysis which results in lactate production. Increase in Reactive Oxygen Species (ROS) and inability of defense system to eliminate them is also responsible for alteration of regulatory pathways. The patient with elevated lactate levels are at significant risk of morbidity and hence, require a prompt treatment. Aim: To estimate and study the lactate levels in tear in various degree of myopia. Materials and Methods: This case-control study was conducted in tertiary care center, Pt. B.D. Sharma PGIMS, Rohtak, Haryana, India. Twenty five patients each with low, medium, high myopia, age and sex matched healthy controls (i.e, Group 1-4). Diagnosis was established with help of detailed history, clinical and ocular examination. Lactate levels were estimated in tear samples by enzymatic method on autoanalyzer within 30 minutes of collection. Independent Student’s t-test was used to determine the significance between myopia and controls. Results: Out of total 100 subjects, 68% were males and 32% were females. The mean±SD age was 24.56±6.35, 24.12±5.45, and 23.24±5.17, 21.69±3.95 in the Group 1, Group 2, Group 3 and Group 4 respectively in the control group, group with low, medium and high myopia respectively which was statistically not significant. The results of this study showed that lactate levels in tears were significantly higher (p-value=0.013) in myopia patients as compared to controls (1.34±0.46 versus 1.06±0.50). Additionally, the lactate levels increased with the progression of degree of myopia. Conclusion: Increase in the level of lactate in tear was directly proportional to the degree of myopia. Tear lactate levels can be used as a non invasive method to study oxidative stress in individuals. Further studies with more oxidative markers in tears can also be compared with blood values in larger groups of patients with long-term follow-up to validate the finding.

Oxidative Stress and Its Related Factors in Latent Autoimmune Diabetes in Adults.

Aims Few research was reported to explore oxidative stress in individuals with latent autoimmune diabetes in adults (LADA). Therefore, our goal is to study oxidative stress and related factors in LADA patients. Methods In this study, 250 Chinese inpatients were diagnosed with LADA (n = 110) and type 2 diabetes mellitus (n = 140) and 140 healthy volunteers were recruited. Moreover, individuals with LADA were followed for 6 months to evaluate whether short-term glycemic control during hospitalization can improve oxidative stress. Clinical and laboratory measurements of height, weight, blood pressure, glycosylated hemoglobin (HbA1c), blood lipids, 8-isoprostaglandin F2α (8-iso-PGF2α), and superoxide dismutase (SOD) were performed. Stepwise multiple regression analyses were used to assess factors that related to oxidative stress in individuals with LADA. Results Compared with patients with type 2 diabetes, individuals with LADA have better oxidative stress and worse oxidative stress than healthy volunteers. After multiple regression analyses, systolic blood pressure, HbA1c, duration of diabetes, and diabetic retinopathy were associated with 8-iso-PGF2α and HbA1c. Diabetic retinopathy and diabetic ketosis were associated with SOD in individuals with LADA. Our results also revealed that, after 6 months of follow-up, oxidative stress was improved to some extent in persons with LADA. Conclusions Our results show that compared with type 2 diabetes, LADA means less oxidative stress, and compared with healthy volunteers, it means more oxidative stress. Systolic blood pressure, HbA1c, duration of diabetes, diabetic retinopathy, and ketosis were associated with oxidative stress in individuals with LADA. Furthermore, short-term glycemic control can improve oxidative stress to some extent in individuals with LADA.

Analysis of the Functional Aspects of Sperm and Testicular Oxidative Stress in Individuals Undergoing Metabolic Surgery.

Metabolic surgery is a recommended treatment for obese patients that results in BMI reduction; however, the observed impact of this therapy on male fertility is inconsistent. This research aimed to study the effects of BMI changes after metabolic surgery on seminal analysis, sex hormonal profile, sperm functional integrity, and the seminal plasma lipid peroxidation levels. A prospective study was performed in 15 patients for whom metabolic surgery was recommended. The patients were evaluated by the techniques proposed in this study before and after the surgical procedure for 12 months. In each analysis, the male sex hormonal profile, semen analysis, sperm functional integrity, and seminal lipid peroxidation levels were assessed. The surgery resulted in BMI reduction and improvement in seminal characteristics and male sex hormone profile. The semen analysis showed increases in volume, sperm progressive motility, and in sperm morphology and a decrease in immotile sperms. Sperm mitochondrial activity and sperm DNA integrity were improved, and the levels of seminal lipid peroxidation were decreased. The hormonal profile showed lower levels of estradiol and highest levels of luteinizing hormone (LH), sex hormone-binding globulin (SHBG), and testosterone. BMI changes resulting from this treatment and its metabolic consequences can be associated with changes in the male fertile potential, leading to an improvement in the seminal quality, male sex hormone profile, sperm functional aspects, and levels of seminal lipid peroxidation, thus decreasing the testicular oxidative stress.

A Positive Relationship between Exposure to Heavy Metals and Development of Chronic Diseases: A Case Study from Chile.

Chile is a mining country, where waste mining is frequently found in the vicinity of inhabited areas. To explore the association between metal exposure and alterations in glucose metabolism, inflammatory status, and oxidative stress in individuals with chronic exposure to metals, a cross-sectional study was performed with 25 volunteers, between 45–65 years old. Inductive coupled plasma mass spectrometry (ICP-MS) was used to measure urinary levels of total arsenic (As) and its metabolites, cooper, nickel, chromium, and lead. Lipid profile, glucose, and insulin were measured in blood, as well as inflammation (interleukin-6, IL-6) and oxidative stress (8-hydroxy-2′deoxyguanosine, 8-OHdG) markers. Increased levels of Low-density lipoprotein, high-density lipoproteins, cholesterol and 8-OHdG, and the index for homeostasis model assessment—insulin resistance (HOMA-IR) were observed in 72%, 60%, and 56% of the volunteers, respectively. Blood-glucose levels were correlated with dimethylarsinic acid (DMA) (R2 = 0.47, p = 0.019), inorganic As (Asi) (R2 = 0.40, p = 0.012), and Ni (R2 = 0.56; p = 0.044). The models with these compounds explained 72% of the glycemia variability (βDMA = −6.47; βAsi = 6.68; βNi = 6.87). Ni showed a significantly influence on IL-6 variability (β = 0.85: R2 = 0.36). Changes in glycemia could be related to exposure to low levels of Asi and Ni, representing risk factors for metabolic diseases. Body mass index would confuse the relation between IL-6 and Ni levels, probably due to known chronic inflammation present in obese people.

Patients with Gaucher disease display systemic oxidative stress dependent on therapy status

Gaucher disease is an autosomal recessive metabolic disorder caused by mutations in GBA1, which encodes for the lysosomal hydrolase enzyme, β-glucocerebrosidase. The resulting misfolded protein can trigger endoplasmic reticulum stress and an unfolded protein response within the affected cells. The enzyme deficiency leads to accumulation of its substrates, glucosylceramide and glucosylsphingosine, within macrophage lysosomes and with prominent disease manifestations in macrophage rich tissues. Resultant lysosomal pathology and impaired autophagy leads to redox imbalance, mitochondrial dysfunction and intracellular oxidative stress. Here we have systematically examined a role for oxidative stress in individuals affected by Gaucher disease. We compared multiple oxidative stress biomarkers in plasma and red blood cell samples from patients who are currently untreated, with those who are stable on standard-of-care therapy, and with healthy controls. We found significant differences in key oxidative stress biomarkers in untreated patients compared to healthy control. In treated patients, results generally fell between the controls and the untreated patients. Interestingly, even asymptomatic and minimally symptomatic untreated patients had evidence of significant systemic oxidative stress. We conclude that underlying oxidative stress may contribute to Gaucher disease pathophysiology including long-term adverse outcomes such as Parkinsonism and malignancies. Therapies targeting oxidative stress may prove useful as adjuvant treatments for Gaucher disease and other lysosomal storage disorders.

Effect of periodontitis on oxidative stress parameters in patients with rheumatic heart valve disease

ObjectiveThe aim of this study was to evaluate the effects of periodontitis on oxidative stress parameters by investigating serum and gingival crevicular fluid (GCF) total antioxidant capacity (TAOC), total oxidant status (TOS), and oxidative stress index (OSI) values in patients with rheumatic heart valve disease (RHVD). Materials and methodsThe study population comprised 76 patients, who were divided into four groups: chronic periodontitis with RVHD (RV-CP), periodontally healthy with RVHD (RV-C), systemically healthy with chronic periodontitis (CP), and systemically and periodontally healthy (C). Demographic, periodontal, and echocardiographic parameters were measured. Serum and GCF oxidative stress parameters were evaluated based on the OSI. ResultsSimilar serum oxidative stress parameters were found in all study groups (P ≥ 0.05). The GCF TAOC values of the C group were significantly higher than those of the other groups (P = 0.001). The GCF OSI values of the C group were significantly lower than those of the other groups (P = 0.001). The GCF TOS and OSI values of the RV-CP group were significantly higher than those of the CP and C groups (P = 0.001). The GCF TOS value of the RV-C group was significantly higher than those of the CP and C groups (P = 0.001). ConclusionsAltered local oxidative stress profile was associated with the presence of periodontitis. Rheumatic heart valve disease may increase oxidative stress in individuals with chronic periodontitis.

Oxidative stress in individuals on different dietary patterns- A comparative study

The major chronic disorders such as cancer, cardiac ailments and diabetes are global health burden and the dietary habits playing a significant role in setting these among other factors. There is an assumption that non-vegetarian diet produces more free radicals (FR) when compared to vegetarian food. However recent studies showed an equal contribution of FR injury in vegetarians too. The assessment of the FR markers may provide an analytical report in correlation with different dietary pattern.In this comparative study, the individuals (age group of 15 to 50 years) with their dietary habits of vegetarian (n=60) and of non-vegetarian diet (n=60), were included. The serum was analysed for the parameters, fasting blood sugar (FBS), Lipid Profile, MDA, IMA and oxidised LDL (oxLDL). The quantitative variables were analysed by appropriate statistical methods and the p value&amp;#60;0.05 is considered statistically significant.The comparative values are expressed as mean ± SD for vegetarians and non-vegetarian groups and it is evident that the FBS and lipid profile and oxLDL were statistically non-significant. Malondialdehyde (MDA) and Ischemia modified albumin (IMA) are significantly raised in non-vegetarian group in comparison to the vegetarian group (p&amp;#60;0.05).Based upon the dietary patterns in the healthy individuals, the oxidative stress markers i.e. MDA, IMA are showed conspicuous difference and oxLDL is not significant. The ratio of IMA/MDA in non vegetarians has been considered for the intensity of the oxidative stress beyond the specified ratio (18.44).

Coenzyme Q10 Supplementation Improves Adipokine Levels and Alleviates Inflammation and Lipid Peroxidation in Conditions of Metabolic Syndrome: A Meta-Analysis of Randomized Controlled Trials.

Evidence from randomized controlled trials (RCTs) suggests that coenzyme Q10 (CoQ10) can regulate adipokine levels to impact inflammation and oxidative stress in conditions of metabolic syndrome. Here, prominent electronic databases such as MEDLINE, Cochrane Library, and EMBASE were searched for eligible RCTs reporting on any correlation between adipokine levels and modulation of inflammation and oxidative stress in individuals with metabolic syndrome taking CoQ10. The risk of bias was assessed using the modified Black and Downs checklist, while the Grading of Recommendations Assessment, Development and Evaluation (GRADE) tool was used to evaluate the quality of evidence. Results from the current meta-analysis, involving 318 participants, showed that CoQ10 supplementation in individuals with metabolic syndrome increased adiponectin levels when compared to those on placebo (SMD: 1.44 [95% CI: −0.13, 3.00]; I2 = 96%, p < 0.00001). Moreover, CoQ10 supplementation significantly lowered inflammation markers in individuals with metabolic syndrome in comparison to those on placebo (SMD: −0.31 [95% CI: −0.54, −0.08]; I2 = 51%, p = 0.07). Such benefits with CoQ10 supplementation were related to its ameliorative effects on lipid peroxidation by reducing malondialdehyde levels, concomitant to improving glucose control and liver function. The overall findings suggest that optimal regulation of adipokine function is crucial for the beneficial effects of CoQ10 in improving metabolic health.

Effects of diets high in animal or plant protein on oxidative stress in individuals with type 2 diabetes: A randomized clinical trial

High-protein diet is a promising strategy for diabetes treatment supporting body weight control, improving glycaemic status, cardiovascular risk factors and reducing liver fat. Here, we investigated effects of diets high in animal (AP) or plant (PP) protein on oxidative stress and antioxidant status in individuals with type 2 diabetes (T2DM). 37 obese individuals (age 64.3 ± 1.0 years) with T2DM were randomized to an isocaloric diet (30 energy(E)% protein, 30 E% fat and 40 E% carbohydrates) rich in AP or PP for 6 weeks. Markers of oxidative and nitrosative stress and antioxidant status in plasma and nitrate/nitrite levels in urine were assessed. Gene expression in subcutaneous adipose tissue (SAT) was analysed by RNA-Seq and real-time PCR. Both AP and PP diets similarly reduced plasma levels of malondialdehyde (PAP = 0.003, PPP = 1.6 × 10−4) and protein carbonyls (PAP = 1.2 × 10−4, PPP = 3.0 × 10−5) over 6 weeks. Nitrotyrosine (NT) increased upon both AP and PP diets (PAP = 0.005, PPP = 0.004). SAT expression of genes involved in nitric oxide (NO) and oxidative stress metabolism and urine NO metabolite (nitrate/nitrite) levels were not changed upon both diets. Plasma levels of carotenoids increased upon PP diet, whereas retinol, alpha- and gamma-tocopherol slightly decreased upon both diets. AP and PP diets similarly improve oxidative stress but increase nitrosative stress markers in individuals with T2DM. Mechanisms of the NT regulation upon high-protein diets need further investigation.

Multi-parametric analysis of ciprofloxacin toxicity at ecologically relevant levels: Short- and long-term effects on Daphnia magna

The increased presence of emergent compounds, such as pharmaceuticals drugs, in the aquatic compartment has been acknowledged as an evolving environmental issue whose consequences are not yet fully characterized. Specific classes of pharmaceutical drugs, such as fluoroquinolone antibiotics, can exert toxic effects to non-target species with ecological significance, since these compounds are environmentally stable and persistent, and may interact with some of the key physiologic processes of organisms. Despite such characteristics, knowledge about the effects of these drugs is still scarce, especially to non-target organisms. The present study aimed to evaluate the effects of chronic and acute exposures of the cladoceran Daphnia magna to the fluoroquinolone antibiotic ciprofloxacin. Putative toxic effects were assessed, following acute and chronic exposures to ecologically relevant concentrations of ciprofloxacin, through enzymatic (cholinesterase – ChEs, catalase – CAT, glutathione S-transferases – GSTs) and non-enzymatic (thiobarbituric acid reactive substances – TBARS, glycogen – Gly) biomarkers. In addition, we also determined behavioural (swimming distance – SD) and morphological (body length of the first brood – BL1B) endpoints in animals exposed to this drug. Ciprofloxacin acute exposure resulted in increased CAT and ChEs activities, and inhibited GSTs activity. After chronic exposure, ChEs activity was significantly inhibited, while GSTs activity was significantly enhanced. TBARS levels were only increased at higher concentrations of ciprofloxacin. CAT activity and Gly content did not evidence a clear and significant pattern of variation. SD was slightly inhibited during dark cycles. BL1B presented a significant decrease for animals subjected to an intermediate concentration. Results showed that even ecologically relevant concentrations of ciprofloxacin may cause oxidative stress in individuals of D. magna. The present study showed important data that corroborate the occurrence of significant biochemical alterations in key features of an aquatic organism when exposed to relevant levels of a widely used antibiotic, establishing essential links between environmental exposure to this specific drug and putative toxic challenges that may result in irreversible changes and damages, especially at the individual level. However, changes in the size of neonates suggest that population alterations are likely to occur under real scenarios of chronic contamination by this drug.

Antidepressant activity of crocin-I is associated with amelioration of neuroinflammation and attenuates oxidative damage induced by corticosterone in mice

Depression is the leading cause of mental health-related disease globally, and it affects an estimated 300 million people worldwide. However, its physiological causes are not fully understood. Since available antidepressants fail to achieve complete disease remission, treating diversification of depression may be a useful contribution. Crocin, one of the main glycosylated carotenoids of saffron, has been found to have numerous pharmacological activities and has been reported to be associated with neuroprotective effects. However, the biological action of crocin-I, a major member of the crocin family, on depression-like behavior, neuroinflammation and oxidative damage in depressed animals remains unclear. The present study showed that crocin-I exerts significant antidepressant effects in a model of chronic corticosterone (CORT)-induced depression, as evidenced by the attenuation of depression-like behaviors in the open field test, forced swimming test and tail suspension test. The antidepressant activity of crocin-I was probably achieved through the suppression of neuroinflammation (IL-1β) and oxidative stress in the mouse hippocampus. Additionally, the oral administration of crocin-I at a dose of 40 mg/kg reduced the CORT-induced accumulation of nicotinamide in the liver of the mice to improve the synthesis of NAD+, thereby stimulating the activity of SIRT3 deacetylase to elevate the activity of antioxidants such as superoxide dismutase 2 and glutathione reductase. Moreover, crocin-I reduced the levels of oxidative damage markers (reactive oxygen species and malonaldehyde) to rescue impaired mitochondrial function caused by CORT treatment, which was represented by electron transport chain and oxidative phosphorylation normality, and thus rescue ATP production to the level of that in wild-type mice. Our findings shed new light on the mechanism of action of crocin-I on depression-like behavior and oxidative stress in individuals stressed by perceived conditions.

Is oxidative stress associated with disease severity, pulmonary function and metabolic syndrome in chronic obstructive pulmonary disease?

ObjectiveTo investigate associations between oxidant/antioxidant biomarkers with the disease severity, pulmonary function and diagnosis of metabolic syndrome (MetS) in patients with COPD. MethodsSeventy-four subjects were included, 39 with COPD (age 69±7 years; female 41%) and 35 for control group (age 69±7 years; female 43%). They were diagnosed with MetS and allocated in one of 4 subgroups: COPD and control, with and without MetS, respectively. Advanced oxidation protein products (AOPP), paraoxonase-1, catalase activity, sulfhydryl group and total lipid hydroperoxide were assayed. Pulmonary function was performed with a plethysmograph. ResultsCOPD severity (GOLD≥3) and pulmonary function were associated with sulfhydryl group and AOPP (p≤.03 for all). The prevalence of MetS was associated with AOPP in COPD (p=.04). Individuals with COPD and MetS showed higher AOPP compared to COPD without MetS (p<.0001). ConclusionCOPD severity, worse pulmonary function and presence of metabolic syndrome are associated with oxidative stress in individuals with COPD.

The effect of apple vinegar consumption on glycemic indices, blood pressure, oxidative stress, and homocysteine in patients with type 2 diabetes and dyslipidemia: A randomized controlled clinical trial

Some foods and drinks contain special ingredients, causing impressive effects on human health. The aim of the current study was to assess the health effects of apple vinegar in patients with diabetes and dyslipidemia. Seventy participants with type 2 diabetes and hyperlipidemia were randomly assigned into an intervention and control group in order to assess the effect of 20ml apple vinegar per day using an 8-week parallel study. Fasting blood sugar (FBS), homeostasis model assessment for insulin resistance (HOMA-IR), homeostasis model assessment for b-cell function (HOMA-B), quantitative insulin sensitivity checks index (QUICKI), insulin, malondialdehyde (MDA), 2,20-Diphenyl-1- picrylhydrazyl (DPPH), homocysteine, systolic blood pressure (SBP), and diastolic blood pressure (DBP) were measured at the beginning and end of the study. The intervention with apple vinegar could significantly improve FBS (mean change:-10.16±19.48mg/dl, p=0.006) and DPPH (mean change: 16.58±11.56, p<0.001) within intervention group and in comparison with control group (p<0.001). Additionally, the significant increase of MDA in control group (p<0.05) caused a considerable difference between two groups. Glycemic indices containing insulin, HOMA-IR, HOMA-B, and QUICKI decrease significantly in both groups (p<0.05). No considerable effect was observed on blood pressure and homocysteine in intervention group as well as control group. This trial provided some evidences that apple vinegar consumption may cause beneficial effects on glycemic indices and oxidative stress in individuals with diabetes and dyslipidemia. This randomized clinical trial was registered in the Iranian Registry of Clinical Trials (https://www.irct.ir/) as 2013070710826N5.

¿Está el estrés oxidativo asociado a la gravedad de la enfermedad, a la función pulmonar y al síndrome metabólico en la enfermedad pulmonar obstructiva crónica?

ObjectiveTo investigate associations between oxidant/antioxidant biomarkers with the disease severity, pulmonary function and diagnosis of metabolic syndrome (MetS) in patients with COPD. MethodsSeventy-four subjects were included, 39 with COPD (age 69±7 years; female 41%) and 35 for control group (age 69±7 years; female 43%). They were diagnosed with MetS and allocated in one of 4 subgroups: COPD and control, with and without MetS, respectively. Advanced oxidation protein products (AOPP), paraoxonase-1, catalase activity, sulfhydryl group and total lipid hydroperoxide were assayed. Pulmonary function was performed with a plethysmograph. ResultsCOPD severity (GOLD≥3) and pulmonary function were associated with sulfhydryl group and AOPP (P≤.03 for all). The prevalence of MetS was associated with AOPP in COPD (P=.04). Individuals with COPD and MetS showed higher AOPP compared to COPD without MetS (P<.0001). ConclusionCOPD severity, worse pulmonary function and presence of metabolic syndrome are associated with oxidative stress in individuals with COPD.

Copper accumulation in the brain of Down syndrome model mice and its pathophysiological significance

Down syndrome caused by triplication of human chromosome 21 (HSA21) is the most frequent aneuploidy, resulting in mental retardation, intellectual disability and accelerated aging. Individuals with DS are at an increased risk of developing Alzheimer's disease (AD)-like dementia, with up to 75% of DS people in their 60s developing dementia. Oxidative stress is widely accepted as a mechanism underlying a number of DS symptoms, such as accelerated aging and cognitive decline. Superoxide disumutase 1 (Sod1) and amiloyd precursor protein (App) genes are suggested as the candidate genes in HSA21 underlying the enhanced oxidative stress in individuals with DS. However, we previously demonstrated that the Ts1Cje mouse model, which has a normal copy number of both candidate genes, also shows enhanced oxidative stress, suggesting that triplicated genes other than Sod1 and App likely enhance oxidative stress in the brain of DS people. To identify the molecules with enhanced oxidative stress in Ts1Cje mice, we performed several -omics analyses. Recently, we showed that copper was accumulated in the brain of adult Ts1Cje mice in an analysis using inductively coupled plasma mass spectrometry (ICP-MS), and a low-copper diet was able to improve the elevated levels of copper. The low-copper diet also resolved some anomalies, such as the enhanced oxidative stress, accumulation of phosphorylated tau and low anxiety. These findings suggest that the accumulation of copper in the DS brain may be a therapeutic target for ameliorating a number of abnormal phenotypes in individuals with DS.

The Relationship between Phthalate Exposures and Oxidative Stress in School Age Children

Background/Aim: Phthalates are ubiquitous in the environment and are found in many household products. Phthalate exposures may increase oxidative stress in individuals via the formation of reactive...

The Association Between Dietary Sulfur Amino Acid Intake and Markers of Vascular Health

OBJECTIVEThe sulfur amino acid (SAA) methionine (Met) is a precursor to the SAAs cysteine (Cys) and its oxidized form, cystine (CySS). Previous research has found positive associations between plasma CySS levels and classic CVD risk factors (e.g., age, blood pressure, obesity). As dietary SAA can influence plasma levels of SAA, we hypothesized that increased intake of dietary SAAs would be associated with worsened markers of vascular health.SUBJECTS AND METHODSThis was a cross‐sectional study of 685 adults in the Emory/Georgia Tech Predictive Health Initiative cohort. Key markers of vascular health were assessed including arterial stiffness [via pulse wave velocity (PWV) and augmentation index (AIX)], flow mediated vasodilation (FMD), blood pressure (BP), and serum levels of triglycerides (TG), total cholesterol (TC), LDL‐C, and HDL‐C. Habitual dietary intake of Cys, CySS, Met and glutathione (GSH), a related sulfur‐containing antioxidant, were determined from the Block Food Frequency Questionnaire and corrected for energy intake. The relationships between dietary intake and markers of vascular health were assessed with Pearson correlations and multiple linear regression, adjusted for age, sex, race, BMI, smoking history, diabetes status, and history of CVD.RESULTSThe mean age was 48.2 yr (SD=10.8); 66% of subjects were female and 71% were white. Four percent of participants were current smokers, 8% reported a history of diabetes, and 7% reported a history of CVD. Reported dietary intake of total SAA was 39.6 ± 17.3 mg/kg/day, over twice the Recommended Dietary Allowance for total SAA. Pearson analyses showed no significant correlations of dietary SAA, reduced GSH, or total GSH with PWV, AIX, FMD, systolic or diastolic BP, or serum lipid levels. However, there was a positive association between total dietary GSH intake and HDL levels (r=0.11, p=0.006). After multivariate adjustment for demographic variables, dietary intake of Met was inversely associated with PWV (beta=−0.06, p=0.03). Dietary intake of Met (beta =−0.14, p=0.04), CySS (beta=−0.17, p=0.02) and total SAA (beta=−0.16, p=0.049) were inversely associated with serum TG levels. Dietary intake of GSH remained positively associated with serum HDL (beta=0.002, p=0.02).CONCLUSIONContrary to our hypothesis, higher dietary intake of Met (but not Cys or CySS) was associated with decreased arterial stiffness (PWV), while intake of individual and total SAA was not linked to AIX or FMD. Increased dietary intake of SAAs was also associated with decreased serum TG levels, and dietary GSH was positively associated with increased serum HDL. Further studies on the impact of dietary intake of SAA and GSH over time on markers of vascular health and oxidative stress in individuals at risk for CVD appear warranted.Support or Funding InformationEmory SURE program and NIH grants UL1 TR000454, K01 DK102851 (JAA), P30 ES019776 (ELB, TRZ, JAA) and K24 DK096574 (TRZ)