Stress Parameters In Plasma Research Articles

The effects of different light spectrum on some oxidative stress parameters in male and female rats

The objective of this study was to investigate oxidative stress parameters in plasma, liver, and brain of Sprague Dawley rats grown under a compact fluorescent lamp with purple, blue, green, yellow, orange, red, and white. For this purpose, 56 male and 56 female rats were housed in standard cages under seven different light colors from weaning until puberty. Malondialdehyde (MDA), glutathione (GSH), and glutathione peroxidase (GPx) in plasma, liver, and brain were examined as oxidative stress parameters. Two factors which are gender and light were investigated regarding the main effects by Two-way ANOVA with the General Linear Model procedure. The different light spectrums had a significant impact on MDA, GSH and, GPx of plasma, liver, and brain (P<0.05). The red group resulted the highest in plasma, liver, and brain MDA. In addition, some of the examined parameters were different for the gender basis. The plasma GSH, the liver MDA, the liver and brain GPx were different in male and female rats (P<0.05). Only the liver GPx enzyme activity was higher in male rats, the other parameters in the female rats had a higher value. In conclusion, low-wavelength lights may be more useful for rats’ environments when compared to high wavelengths in manner oxidative stress. However, illumination is not the sole phenomenon for raising animals. Environmental demands may vary from time to time and even according to gender. Moreover, it may be useful for studies to be conducted by considering other lighting factors such as intensity and cycle.

The effect of krill oil on Wnt/β-catenin signaling pathway in acetaminophen-induced acute liver injury in mice

Abstract Objectives This study investigated the effect of krill oil (KO) on liver damage caused by acetaminophen (APAP). Methods In the present study, the control and APAP groups were given distilled water by gavage for 14 days. In addition, the KO and APAP+KO groups were given 500 mg/kg krill oil by gavage for 14 days. At the end of 14 days, 0.9 % sodium chloride solution (saline solution) administration was applied intraperitoneally to the control and KO groups. Meanwhile, 220 mg/kg acetaminophen was administered to the APAP and APAP+KO groups. While some biochemical parameters in plasma were examined, some oxidative stress parameters in plasma and liver tissue were evaluated. Apoptotic and inflammatory responses of some primer sequences determined by quantitative Real-Time PCR (qPCR) in liver tissue. After histopathological examination of liver tissue, immunohistochemical analysis was performed with Wnt inhibitory factor-1 (Wif-1), beta-catenin (β-Catenin), and 8-hydroxy-2′-deoxyguanosine (8-OHdG). Results The Wif-1 positivity in hepatocytes increased significantly in the APAP group (5.29 ± 0.71) compared to the control (1.14 ± 0.51), and KO (2.14 ± 0.55) groups (p<0.001). The 8-OHdG positivity in hepatocytes increased significantly in the APAP group (19.57 ± 0.58) compared to the control (0.43 ± 0.20), KO (3.57 ± 0.48), and APAP+KO (4.00 ± 2.53) groups (p<0.001). Conclusions As a result, krill oil could be used as a nutritional supplement to protect the liver against acetaminophen-induced liver injury.

Chemical Profile of Cyperus laevigatus and Its Protective Effects against Thioacetamide-Induced Hepatorenal Toxicity in Rats.

Cyperus species represent a group of cosmopolitan plants used in folk medicine to treat several diseases. In the current study, the phytochemical profile of Cyperus laevigatus ethanolic extract (CLEE) was assessed using UPLC-QTOF–MS/MS. The protective effect of CLEE at 50 and 100 mg /kg body weight (b.w.) was evaluated on hepatorenal injuries induced by thioacetamide (100 mg/kg) via investigation of the extract’s effects on oxidative stress, inflammatory markers and histopathological changes in the liver and kidney. UPLC-QTOF–MS/MS analysis of CLEE resulted in the identification of 94 compounds, including organic and phenolic acids, flavones, aurones, and fatty acids. CLEE improved the antioxidant status in the liver and kidney, as manifested by enhancement of reduced glutathione (GSH) and coenzyme Q10 (CoQ10), in addition to the reduction in malondialdehyde (MDA), nitric oxide (NO), and 8-hydroxy-2′-deoxyguanosine (8OHdG). Moreover, CLEE positively affected oxidative stress parameters in plasma and thwarted the depletion of hepatorenal ATP content by thioacetamide (TAA). Furthermore, treatment of rats with CLEE alleviated the significant increase in plasma liver enzymes, kidney function parameters, and inflammatory markers. The protective effect of CLEE was confirmed by a histopathological study of the liver and kidney. Our results proposed that CLEE may reduce TAA-hepatorenal toxicity via its antioxidant and anti-inflammatory properties suppressing oxidative stress.

Indoxyl Sulfate Induces Oxidative Changes in Plasma and Hemolysate

The deteriorating function of the kidneys in chronic kidney disease (CKD) is associated, among other things, with the retention of many unnecessary metabolic products in the body. Indoxyl sulfate (IS) belongs to the group of uremic toxins with a high protein binding affinity. Moreover, this compound can generate oxidative stress. We hypothesized that a high concentration of IS might induce oxidative changes in erythrocytes and plasma components, and could therefore contribute to CKD progression. In this study, we evaluated the influence of IS on the oxidative stress parameters in plasma and hemolysate. Moreover, as a result of the action of IS, we observed a decrease in the total antioxidant capacity and a change in the activity of catalase and superoxide dismutase in hemolysate and plasma. The obtained results indicate that IS induces oxidative damage to hemolysate and plasma components. Greater changes in the parameters of oxidative stress were observed in hemolysate than in plasma treated with indoxyl sulfate. The obtained results suggest that the increased concentration of IS in patients with chronic kidney disease may lead to a decrease in the lifespan of erythrocytes in their bloodstream.

Evaluation of the effect of tongue ties on stress parameters, behaviour and heart-rate variability in racehorses

AbstractFixation of the tongue to the mandible using so-called tongue ties (TTs) is common practice in Standardbred (SB) and Thoroughbred (TB) racing, but little is known about their impact on animal welfare. In this study, the influence of TTs on heart-rate variability (HRV), stress parameters in plasma (cortisol, glucose, lactate) and behaviour was evaluated in 30 SBs and 29 TBs (n = 59) presenting with exercise insufficiency. Overall, 36/59 horses (24 SBs, 12 TBs) were familiar with TTs. Blood was taken at rest, after TT application and after racing in all horses, additionally samples were taken without TT in SBs another day. HRV was calculated over 3 min before, during and after racing. Additionally, SBs’ behaviour during TT application and racing was documented in real time. TT application did not increase cortisol levels significantly, while highly significant increases in cortisol levels were found after racing. Lactate levels were not influenced by TT application, but also significantly increased after racing. No significant differences were found for glucose. Seventeen out of 30 SBs showed mild (n = 8), moderate (n = 8) and severe (n = 1) reactions during TT application, none during or after race training. At rest, 23/30 SBs had a low/high frequency (LF/HF) ratio < 1.5 (1.05 [± 0.61], n = 30, dominating parasympathetic activity). After TT application, the LF/HF ratio increased to 1.4 (± 0.45) (increased sympathetic activity). In TBs, sympathetic activity dominated at rest. No differences in LF, HF and LF/HF were found after TT application or comparing HRV after racing with/without TT. The stress response (blood parameters and HRV) was not influenced by horses’ naivety to TTs, however an increased stress response was observed in SB mares. Overall, obvious adverse behaviour, but only slight evidence of an increased systemic stress response, was found in this study. These results might provide objective evidence for future decisions from equine sports organisations concerning further regulations on TTs.

The Effects Of Hydrogen Sulfide Synthase Inhibition Following Acute Administration Of Homocysteine On Oxidative Stress Markers In Rat Plasma

Background and Aims: Homocysteine (Hcy) is well recognized as an independent risk factor for atherosclerosis and endothelial dysfunction. Among other mechanisms, it has been shown that induction of oxidative stress is involved. There are also increasing number of assumptions that signaling gaseous molecules might have an important role in effects of Hcy on cardiovascular function. Thus, the aim of the study is to evaluate and compare the effects of Hcy and DL-PAG (H2S production inhibitor) on oxidative stress parameters in plasma, as well as the effects of their combination and possible interaction.

Heterozygous connexin 50 mutation affects metabolic syndrome attributes in spontaneously hypertensive rat.

BackgroundSeveral members of connexin family of transmembrane proteins were previously implicated in distinct metabolic conditions. In this study we aimed to determine the effects of complete and heterozygous form of connexin50 gene (Gja8) mutation L7Q on metabolic profile and oxidative stress parameters in spontaneously hypertensive inbred rat strain (SHR).MethodsAdult, standard chow-fed male rats of SHR, heterozygous SHR-Dca+/− and SHR-Dca−/− coisogenic strains were used. At the age of 4 months, dexamethasone (2.6 μg/ml) was administered in the drinking water for three days. The lipidemic profile (cholesterol and triacylglycerol concentration in 20 lipoprotein fractions, chylomicron, VLDL, LDL and HDL particle sizes) together with 33 cytokines and hormones in serum and several oxidative stress parameters in plasma, liver, kidney and heart were assessed.ResultsSHR and SHR-Dca−/− rats had similar concentrations of triacylglycerols and cholesterol in all major lipoprotein fractions. The heterozygotes reached significantly highest levels of total (SHR-Dca+/−: 51.3 ± 7.2 vs. SHR: 34.5 ± 2.4 and SHR-Dca−/−: 34.4 ± 2.5 mg/dl, p = 0.026), chylomicron and VLDL triacylglycerols. The heterozygotes showed significantly lowest values of HDL cholesterol (40.9 ± 2.3 mg/dl) compared both to SHR (51.8 ± 2.2 mg/dl) and SHR-Dca−/− (48.6 ± 2.7 mg/dl). Total and LDL cholesterol in SHR-Dca+/− was lower compared to SHR. Glucose tolerance was improved and insulin concentrations were lowest in SHR-Dca−/− (1.11 ± 0.20 pg/ml) in comparison with both SHR (2.32 ± 0.49 pg/ml) and SHR-Dca+/− (3.04 ± 0.21 pg/ml). The heterozygous rats showed profile suggestive of increased oxidative stress as well as highest serum concentrations of several pro-inflammatory cytokines including interleukins 6, 12, 17, 18 and tumor necrosis factor alpha.ConclusionsOur results demonstrate that connexin50 mutation in heterozygous state affects significantly the lipid profile and the oxidative stress parameters in the spontaneously hypertensive rat strain.Electronic supplementary materialThe online version of this article (doi:10.1186/s12944-016-0376-3) contains supplementary material, which is available to authorized users.

The effect of tobacco smoke on oxytocin concentrations and selected oxidative stress parameters in plasma during pregnancy and post-partum - an experimental model.

Tobacco smoking is a serious threat to life and health of society. Among the most vulnerable to the toxic effects of tobacco smoke are foetuses and newborns. The objective of the research was to assess the impact of tobacco smoke exposure on oxytocin levels and biochemical oxidative stress parameters during pregnancy and after birth in an experimental model. In the experiment, exposure to tobacco smoke of gravid and non-gravid rats was monitored. A reliable biomarker of exposure - cotinine - was used in the process and it was determined by means of high-performance liquid chromatography with diode array detection, which ensured high analytical accuracy and precision. Determination of oxytocin was performed by means of enzyme-linked immunosorbent assay. The levels of selected oxidative stress parameters: total protein concentration, uric acid, trolox equivalent antioxidant capacity, protein S-nitrosylation and lipid peroxidation (thiobarbituric acid reactive substances) were measured by spectrophotometric methods. The effect of prenatal and postnatal exposure to tobacco smoke was a lower medium body mass of rat foetuses and pups. Oxidative stress during pregnancy, additionally intensified by tobacco smoke exposure, led to adaptive changes in properties of plasmatic antioxidant barriers. Moreover, the disturbance of oxidoreductive balance by tobacco smoke affects oxytocin fluctuations, what was observed in this study during lactation period. Therefore, women who smoke may breastfeed their children less frequently and for a shorter period.

Growth and feed performance, digestibility and acute stress response of juvenile grouper (Epinephelus fuscoguttatus ) fed diets with hydrolysate from milkfish offal

Nutritional qualities of fish processing by-products can further be improved through enzymatic hydrolysis. The objective of this study was to elucidate the efficacy of hydrolysed milkfish offal at different inclusion levels when fed to juvenile grouper, Epinephelus fuscoguttatus, with an initial body weight of 2.88 ± 0.06 g. The animals were fed for 56 days with seven diets supplemented with 0 (control), 5%, 15% and 25% of milkfish offal (MO) and milkfish offal hydrolysate (MOH). The diets were formulated to be isonitrogenous (45%) and isolipidic (11%). The diets were assigned to 21 tanks (15 fish per tank) with each diet having three replicates. Results from the experimental trials indicated that feed conversion efficiency, feed intake and weight gain of fish significantly (P < 0.05) improved when fed diets with MOH. No significant differences within the rest of the dietary treatments were observed. Survival rate (>90%) did not differ in all the dietary treatments. Proximate composition (crude protein, crude fat and ash) indicated no significant difference among fish fed from all the dietary treatments. Apparent digestibility of MOH indicated a 95% and 66% digestibility for protein and dry matter respectively. Plasma stress parameters (cortisol and glucose) were not influenced by the dietary treatment when fish were subjected to an acute stressor (5-min chasing). Liver morphology indicated normal hepatocyte shape and the presence of lipid droplets in fish fed from all the dietary treatments. The results indicated that milkfish offal processed as hydrolysate can be utilized in grouper diets and can promote growth and feed efficiency when supplied at 10–15%.

Increased oxidative stress in patients with 3-hydroxy-3-methylglutaric aciduria.

3-hydroxy-3-methylglutaric aciduria (HMGA; OMIM 246450) is a rare autosomal recessive disorder, caused by the deficiency of 3-hydroxy-3-methylglutaryl-CoA lyase (4.1.3.4), which results in the accumulation of3-hydroxy-3-methylglutaric (HMG) and 3-methylglutaric (MGA) acids in tissues and biological fluids of affected individuals. Recent in vivo and in vitro animal studies have demonstrated that the accumulation of these metabolites can disturb the cellular redox homeostasis, which can contribute to the neurological manifestations presented by the patients. So, in the present work, we investigated oxidative stress parameters in plasma and urine samples from HMGA patients, obtained at the moment of diagnosis of this disorder and during therapy with low-protein diet and L-carnitine supplementation. It was verified that untreated HMGA patients presented higher levels of urinary di-tyrosine and plasma thiobarbituric acid-reactive substances (TBA-RS), which are markers of protein and lipid oxidative damage, respectively, as well as a reduction of the urinary antioxidant capacity. Treated HMGA patients also presented an increased protein oxidative damage, as demonstrated by their higher concentrations of plasma protein carbonyl groups and urinary di-tyrosine, as well as by the reduction of total sulfhydryl groups in plasma, in relation to controls. On the other hand, HMGA patients under therapy presented normal levels of TBA-RS and urinary antioxidant capacity, which can be related, at least in part, to the antioxidant and antiperoxidative effects exerted by L-carnitine. The results of this work are the first report showing that a redox imbalance occurs in patients with HMGA what reinforces the importance of the antioxidant therapy in this disorder.

The influence of 9-day trekking in the Alps on the level of oxidative stress parameters and blood parameters in native lowlanders.

The stimuli acting on a person in a high mountain environment (such as hypobaric hypoxia with subsequent reoxygenation, physical exercise) can significantly increase oxidative stress, stimulate erythropoiesis, lead to changes in the blood count and participate in the development of altitude sickness. The aim was to investigate changes in haematological parameters, indicators of oxidative stress (malondialdehyde - MDA) and antioxidant defences: catalase (CAT), superoxide dismutase (SOD), and total antioxidant status (TAS) in the plasma of young, healthy people after a 9-day expedition in the Alps. A total of 5 patients (4 men and 1 woman), members of the Wrocław Mountaineering Club, aged 24-26 years. Collection of blood samples was carried out immediately before departure and 3 days after the end of exposure to high-altitude conditions. During the expedition, the subjects were exposed to heights: 2,050-4,165 m.a.s.l., and exercise associated with climbing. Trekking in the Alps neither caused significant changes in the parameters of red blood cells nor increased the level of oxidative stress parameters in plasma. CAT activity increased, the ratio of SOD / CAT decreased. There was also a decrease in the total number of leukocytes, mainly monocytes and basophils. 9-day exposure to high-altitude conditions is not a substantial burden for the organism of young, physically active people. The increase in antioxidant capacity is sufficient to stop oxidative processes, which are severe in these conditions, and to prevent the occurrence of significant oxidative stress. Discontinuation of exposure to allergens and dust pollution clears the airways, which is indicated by the reduction in the number of monocytes and basophils.

Fatty Acid Composition and Oxidative Stress Parameters in Plasma after Fish Oil Supplementation in Aging

Fish oil affects oxidative stress parameters and changes in phospholipids fatty acids profiles in plasma, erythrocytes and tissues. We examined the effects of fish oil supplementation in young and old male Wistar rats (3 and 22 months old) on plasma phospholipids fatty acids profiles and blood oxidative stress parameters. Twenty young and twenty aged Wistar rats were randomly divided into four groups (ten animals each): two control groups and two supplemented groups treated for 6 weeks with fish oil capsules containing 45 mg eicosapentanoic acid (EPA) and 30 mg docosahexanoic acid (DHA). Fish oil supple- mentation changed the percentage of long chain fatty acids (FAs): the elevated percentage of eicosatrienoic acid (ETA, 20:3), eicosapentanoic (EPA, 20:5), docosapentanoic acid (DPA, 22:5), n-3 fat- ty acids and decreased arachidonic acid (AA, 20:4). However, there were no age-related changes in total SH groups, the percentages of palmitic (16:0), palmitoleic (16:1), oleic (18:1 (n-9)) and linoleic acid (18:2) in plasma phospholipids and MUFA and they were neither reversed nor prevented by fish oil sup- plementation. Results showed that fish oil supplementation increased SOD and CAT activities in erythro- cytes, and PON activity in the blood plasma of both young and aged rats. Furthermore, fish oil supple- mentation decreased lipid peroxidation (MDA) and nitrite levels in both young and aged rats implying better antioxidant protection and a lower level of oxidative pressure after fish oil supplementation. Our results suggest that fish oil supplementation is beneficial regarding better antioxi- dant protection in both young and aged rats, while applied treatment differs in plasma phospholipids FAs composition.

Effect of short- and long-term exposition to high phenylalanine blood levels on oxidative damage in phenylketonuric patients

Phenylketonuria is the most frequent disturbance of amino acid metabolism. Treatment for phenylketonuric patients consists of phenylalanine intake restriction. However, there are patients who do not adhere to treatment and/or are not submitted to neonatal screening. These individuals are more prone to develop brain damage due to long-lasting toxic effects of high levels of phenylalanine and/or its metabolites. Oxidative stress occurs in late-diagnosed phenylketonuric patients, probably contributing to the neurological damage in this disorder. In this work, we aimed to compare the influence of time exposition to high phenylalanine levels on oxidative stress parameters in phenylketonuric patients who did not adhere to protein restricted diet. We evaluated a large spectrum of oxidative stress parameters in plasma and erythrocytes from phenylketonuric patients with early and late diagnosis and of age-matched healthy controls. Erythrocyte glutathione peroxidase activity and glutathione levels, as well as plasma total antioxidant reactivity were significantly reduced in both groups of patients when compared to the control group. Furthermore, protein oxidative damage, measured by carbonyl formation and sulfhydryl oxidation, and lipid peroxidation, determined by malondialdehyde levels, were significantly increased only in patients exposed for a long time to high phenylalanine concentrations, compared to early diagnosed patients and controls. In conclusion, exposition to high phenylalanine concentrations for a short or long time results in a reduction of non-enzymatic and enzymatic antioxidant defenses, whereas protein and lipid oxidative damage only occurs in patients with late diagnosis.

Relationship between stress, feeding and plasma ghrelin levels in rainbow trout, Oncorhynchus mykiss

Sexually immature rainbow trout were acclimated to small-volume (1 m3) holding tanks and then exposed to short-term stress to examine the relationship between feeding, stress, plasma ghrelin levels and other plasma stress parameters. Plasma ghrelin levels showed an increase 24 h after a single feed, plasma lactate and glucose levels decreased over the same period and plasma cortisol levels were low and constant. One hour of confinement stress resulted in elevations of plasma cortisol, glucose and lactate and depression of plasma ghrelin levels. In a separate experiment, 2 h of confinement stress also depressed feeding immediately after stress, concomitant with increases in plasma cortisol, lactate and glucose; however, in this case there was no change in plasma ghrelin concentrations. A repeat of the 2-h confinement experiment using fish that had not been acclimated to small-volume holding tanks produced a more marked elevation in plasma cortisol and a stronger suppression of feeding post-stress but in this case also, there was no change in plasma ghrelin levels. The results of this study confirm that feeding in rainbow trout is suppressed by confinement stress although the effect is transitory in this domesticated stock. Similar to that in other fishes, plasma ghrelin levels appear to be modulated by feeding status and may be influenced by stress, suggesting an orexigenic role for ghrelin in rainbow trout.

Oxidative stress parameters in plasma of Huntington's disease patients, asymptomatic Huntington’s disease gene carriers and healthy subjects

Animal data and postmortem studies suggest a role of oxidative stress in the Huntington's disease (HD), but in vivo human studies have been scarce. To assess the presence of oxidative stress in HD patients and its occurrence relative to clinical symptoms. Oxidative stress markers were determined in plasma of HD patients (n = 19), asymptomatic HD gene carriers (with > 38 CAG repeats) (n = 11) and their respective sex and agematched healthy controls (n = 47 and n = 22) in a cross-sectional study. With adjustment for age and sex, HD patients had higher plasma lipid peroxidation (LP) levels (ratio 1.20, 95% CI 1.09 to 1.32, p < 0.001) and lower reduced glutathione (GSH) levels (ratio 0.72, CI 0.55 to 0.94, p = 0.011) than their age and sex-matched controls. Although considerably younger, HD gene carriers did not differ from HD patients regarding LP and GSH levels, and had higher plasma LP (ratio 1.16, CI 1.02 to 1.32, p = 0.016) and lower GSH than their matched controls (ratio 0.73, CI 0.5 to 1.05). They had higher LP (ratio 1.18, CI 1.02 to 1.34, p = 0.019) and lower GSH (ratio 0.75, CI 0.51 to 1.11) than the healthy subjects matched to HD patients. Oxidative stress is more pronounced in HD patients and asymptomatic HD gene carriers than in healthy subjects. Differences in plasma LP and GSH are in line with the brain findings in animal models of HD. Data suggest that oxidative stress occurs before the onset of the HD symptoms.