scholarly journals A multicenter study to evaluate oxidative stress by oxidation-reduction potential, a reliable and reproducible method

Andrology ◽  
2017 ◽  
Vol 5 (5) ◽  
pp. 939-945 ◽  
Author(s):  
A. Agarwal ◽  
M. Arafa ◽  
R. Chandrakumar ◽  
A. Majzoub ◽  
S. AlSaid ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Multicenter Study ◽  
Reduction Potential ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Reproducible Method

scholarly journals Oxidation-Reduction Potential as a Biomarker for Severity and Acute Outcome in Traumatic Brain Injury

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Kimberly B. Bjugstad ◽  
Leonard T. Rael ◽  
Stewart Levy ◽  
Matthew Carrick ◽  
Charles W. Mains ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Injury Severity ◽  
Reduction Potential ◽  
Abbreviated Injury Scale ◽  
Static State ◽  
Logit Regression ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential

There are few reliable markers for assessing traumatic brain injury (TBI). Elevated levels of oxidative stress have been observed in TBI patients. We hypothesized that oxidation-reduction potential (ORP) could be a potent biomarker in TBI. Two types of ORP were measured in patient plasma samples: the static state of oxidative stress (sORP) and capacity for induced oxidative stress (icORP). Differences in ORP values as a function of time after injury, severity, and hospital discharge were compared using ANOVAs with significance atp≤0.05. Logit regression analyses were used to predict acute outcome comparing ORP, Injury Severity Score (ISS), Abbreviated Injury Scale (AIS), and Glasgow Coma Scale (GCS). Antioxidant capacity (icORP) on day 4 was prognostic for acute outcomes (p<0.05). An odds ratio of 4.08 was associated with poor acute outcome whenicORP > 7.25 μC.IcORP was a better predictor than ISS, AIS, or GCS scores. sORP increased in those with the highest ISS values (p<0.05). Based on these findings ORP is useful biomarker for severity and acute outcome in TBI patients. Changes in ORP values on day 4 after injury were the most prognostic, suggesting that patients’ response to brain injury over time is a factor that determines outcome.

scholarly journals Oxidation of Human Serum Albumin Exhibits Inter-Individual Variability after an Ultra-Marathon Mountain Race

2017 ◽  
Author(s):  
Ypatios Spanidis ◽  
Alexandros Priftis ◽  
Dimitrios Stagos ◽  
George A. Stravodimos ◽  
Demetres D. Leonidas ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Human Serum Albumin ◽  
Serum Albumin ◽  
Human Serum ◽  
Reduction Potential ◽  
Individual Variability ◽  
Protein Carbonyls ◽  
Marathon Race ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential

The aim of this study was to examine the oxidation of human serum albumin (HSA) caused by oxidative stress after an exhaustive exercise such as ultra-marathon race. Thus, blood samples from 12 adult runners who underwent a 103 km mountain ultra-marathon race were collected pre- and 24, 48 and 72 h post race. HSA was partially purified using affinity chromatography and then was subjected to Western blot analysis for disulfide dimers determination, indicating oxidation. The results were correlated with those from a previous study in which the same samples were analyzed using different oxidative stress markers and a good correlation with protein carbonyls (PC) at all time points was observed. Moreover there was a significant correlation with static oxidation-reduction potential (sORP) at 24 h, and a negative correlation with capacity oxidation-reduction potential (cORP) at 24 and 48 h. In addition, an individual analysis of albumin dimers exhibited great inter-individual differences. This inter-individual variability in the oxidation of HSA may suggest different interventions (e.g. through diet) in order to confront the effects on athletes&rsquo; organism after a strenuous exercise. In conclusion, this study supported the importance of the assessment of albumin dimers as a predictive marker for exercise-induced oxidative stress.

scholarly journals Assessment of Eccentric Exercise-Induced Oxidative Stress Using Oxidation-Reduction Potential Markers

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Dimitrios Stagos ◽  
Nikolaos Goutzourelas ◽  
Amalia-Maria Ntontou ◽  
Ioannis Kafantaris ◽  
Chariklia K. Deli ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Eccentric Exercise ◽  
Reduction Potential ◽  
Diagnostic System ◽  
Thiobarbituric Acid ◽  
Protein Carbonyls ◽  
Knee Extensors ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Exercise Induced

The aim of the present study was to investigate the use of static (sORP) and capacity ORP (cORP) oxidation-reduction potential markers as measured by the RedoxSYS Diagnostic System in plasma, for assessing eccentric exercise-induced oxidative stress. Nineteen volunteers performed eccentric exercise with the knee extensors. Blood was collected before, immediately after exercise, and 24, 48, and 72 h after exercise. Moreover, common redox biomarkers were measured, which were protein carbonyls, thiobarbituric acid-reactive substances, total antioxidant capacity in plasma, and catalase activity and glutathione levels in erythrocytes. When the participants were examined as one group, there were not significant differences in any marker after exercise. However, in 11 participants there was a high increase in cORP after exercise, while in 8 participants there was a high decrease. Thus, the participants were divided in low cORP group exhibiting significant decrease in cORP after exercise and in high cORP group exhibiting significant increase. Moreover, only in the low cORP group there was a significant increase in lipid peroxidation after exercise suggesting induction of oxidative stress. The results suggested that high decreases in cORP values after exercise may indicate induction of oxidative stress by eccentric exercise, while high increases in cORP values after exercise may indicate no existence of oxidative stress.

scholarly journals Oxidation-Reduction Potential in Patients undergoing Transcatheter or Surgical Aortic Valve Replacement

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Kathrin Heldmaier ◽  
Christian Stoppe ◽  
Andreas Goetzenich ◽  
Ann-Christina Foldenauer ◽  
Rachat Zayat ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Aortic Valve ◽  
Aortic Valve Replacement ◽  
Antioxidant Capacity ◽  
Valve Replacement ◽  
Reduction Potential ◽  
Surgical Aortic Valve Replacement ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Significant Difference

Background. Aortic valve stenosis has gained increasingly more importance due to its high prevalence in elderly people. More than two decades ago, transcatheter aortic valve replacement emerged for patients who were denied surgery, and its noninferiority has been demonstrated in numerous studies. Oxidative stress has generated great interest because of its sensitivity to cell damage and the possibility of offering early hints of clinical outcomes. The aim of the present study was to investigate whether there is a significant difference between transcatheter (TAVR) or surgical aortic valve replacement (SAVR) in terms of the changes in oxidation-reduction potential (ORP) and antioxidant capacity. Therefore, we investigated perioperative oxidative stress levels and their influence on clinical outcomes. Methods. A total of 72 patients (50% TAVR versus 50% SAVR) were included in the present study. Static oxidation-reduction potential (sORP) and antioxidant capacity were measured using the RedoxSys™ Diagnostic System (Luoxis Diagnostics, USA) in serum samples drawn before and after surgery, as well as on the first postoperative day. In addition, clinical data were obtained to evaluate the clinical outcome of each case. Results. TAVR patients had higher preoperative sORP levels compared to the SAVR patients and more severe comorbidities. Unlike the TAVR cohort, patients in the SAVR group showed a significant difference in sORP from the pre- to postoperative levels. Capacity demonstrated higher preoperative levels in the SAVR cohort and also a greater difference postoperatively compared to the TAVR cohort. Regression analysis revealed a significant correlation between pre- and postoperative capacity levels (r = -0.9931, p < 0.0001), providing a method of predicting postoperative capacity levels by knowing the preoperative levels. According to the multivariable analysis, both sORP and antioxidant capacity are dependent on time point, baseline value, and type of surgery, with the largest variations observed for time effect and surgery method. Conclusion. A high preoperative sORP level correlated to more severe illness in the TAVR patients. As the TAVR patients did not show significant differences in their preoperative levels, we assume that there was a smaller production of oxidative agents during TAVR due to the less invasive nature of the procedure. Baseline values and development of antioxidant capacity values strengthen this hypothesis. The significant correlation of pre- and postoperative capacity levels might allow high risk patients to be detected more easily and might provide more adequate and individualized therapy preoperatively. This trial is registered with clinicaltrials.gov, identifier: NCT 02488876.

Oxidation-reduction potential: a new marker of oxidative stress and sperm quality

2017 ◽  
Vol 108 (3) ◽  
pp. e139
Author(s):  
R. Sharma ◽  
A. Agarwal ◽  
S. Gupta ◽  
Z. Cakar ◽  
S. Wang ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Reduction Potential ◽  
Sperm Quality ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential

scholarly journals Application of a new oxidation-reduction potential assessment method in strenuous exercise-induced oxidative stress

Redox Report ◽  
2014 ◽  
Vol 20 (4) ◽  
pp. 154-162 ◽  
Author(s):  
Dimitrios Stagos ◽  
Nikolaos Goutzourelas ◽  
David Bar-Or ◽  
Amalia-Maria Ntontou ◽  
Evangelia Bella ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Reduction Potential ◽  
Assessment Method ◽  
Strenuous Exercise ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Exercise Induced
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