Glutathione Peroxidase (Ransel)
Reagent | Glutathione Peroxidase (Ransel)
A Marker of Oxidative Stress
The Randox Ransel assay utilises the enzymatic method enabling the sensitive and accurate detection of glutathione peroxidase.
The Randox Ransel assay displayed a within run precision of <4.86% CV.
A correlation coefficient of r=0.9829 was displayed when the Randox Ransel assay was compared to commercially available methods.
Excellent measuring range
The Randox Ransel has a measuring range of 75 – 925U/l for the comfortable detection of clinically important results.
Dedicated calibrator and control available
Dedicated Ransel calibrator and control available offering a complete testing package.
Applications available detailing instrument-specific settings for the convenient use of the Randox Ransel assay on a variety of clinical chemistry analysers.
Glutathione peroxidase (GPx) is a reactive oxygen species (ROS), generated by bodily cells via mitochondrial and enzymatic sources. It is vital that GPx levels are reviewed as it can cause oxidative damage to membrane lipids, proteins and DNA. GPx is an intracellular antioxidant enzyme that enzymatically converts hydrogen peroxide to water (detoxification). Hydrogen peroxidase is vital for the maintenance of normal thiol redox-balance, mitochondrial function, and growth factor-mediated signal transduction. By converting hydrogen peroxidase to water, GPx aids in modulating these processes 1. GPx also contributes to cell signalling and oxidative protein folding 2.
Four of the eight glutathione peroxidases (GPx) are selenoproteins (containing the amino acid form of selenium, Sec) in humans, however, GPx6 is cysteine-containing in rodents, but a selenoprotein in humans, whereas the remaining GPx’s are cysteine containing. Glutathione peroxidase 4 (GPx4) is emerging as one of the most important seleoproteins in mammals and is one of the key regulators of ferroptosis, a form of regulated necrotic cell death 2.
GPx displays an inverse correlation with free radicals and consequently oxidative stress (OS). When GPx activity is reduced, antioxidant protection is impaired, resulting in oxidative damage to the membrane fatty acids and functional proteins, resulting in neurotoxic damage. Decreased GPx activity and OS is implicated in the incidence and progression of several health problems, including: cardiovascular disease (CVD), diabetes, atherosclerosis, neurodegenerative disorders and other chronic conditions 3.
Reagents Resource Hub
 Ighodaro OMO, Akinloye OA. First line defence antioxidants-superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX): Their fundamental role in the entire antioxidant defence grid. Alexandria Journal of Medicine 2018; 54(4): 287-293.
Superior Performance & Niche Reagents
Randox offer a range of high performance, unique and niche reagents that are designed to enhance your laboratory testing capabilities.
Our impressive portfolio of high performance & unique tests together with our standard assays sets us apart in the in vitro diagnostics market. Our superior performance reagents and methodologies deliver highly accurate and specific results, that can facilitate earlier diagnosis of disease states with confidence and precision.
Benefits of High Performance Reagents
We can help create cost-savings for your laboratory through excellent stability, eliminating the requirement for costly test re-runs. Our quality reagents also come in a range of different kit sizes to reduce waste and for your convenience.
Confidence in Patient Results
Our traceability of material and extremely tight manufacturing tolerances ensure uniformity across our reagent batches. All of our assays are validated against gold-standard methods.
Applications are available detailing instrument-specific settings for the convenient use of the Randox superior performance & unique assays on a wide variety of clinical chemistry analysers.
Superior Performance Offering
Randox offer an extensive range of 115 assays across routine and niche tests, and cover over 100 disease makers. Our high performance assays deliver superior methodologies, more accurate and specific results compared to traditional methods.
Reduce valuable time spent running tests. Randox reagents come in liquid ready-to-use formats and various kit sizes for convenient easy-fit. Barcode scanning capabilities for seamless programming.
Our range of unique assays means that Randox are one of the only manufacturers to offer these tests in an automated biochemistry format.
The in vitro diagnostics market is continuously adapting to the changes in laboratory testing. Consequently, Randox have continued to reinvest in R&D to produce superior performance & unique tests offering laboratories choice, quality and innovation.
The Randox Lp(a) assay is calibrated in nmol/l and traceable to the WHO/IFCC reference material (IFCC SRM 2B) and provides an acceptable bias compared with the Northwest Lipid Metabolism Diabetes Research Laboratory (NLMDRKL) gold standard. A five-point calibrator with accuracy-based assigned target values (in nmol/l) is available, accurately reflecting the heterogeneity of the apo(a) isoforms.
The Randox bile acids test utilises an advanced enzyme cycling method which displays outstanding sensitivity and precision when compared to traditional enzymatic based tests. The Randox 5th Generation Bile Acids test is particularly useful in paediatrics where traditional bile acids tests are affected by haemolytic and lipaemic samples.
A superior assay from Randox, the vanadate oxidation method offers several advantages over the diazo method, including less interference by haemolysis and lipaemia, which is particularly evident for infant and neonatal populations.
The Randox Fructosamine assay utilises the enzymatic method which offers improved specificity and reliability compared to conventional NBT-based methods. The Randox enzymatic method does not suffer from non-specific interferences unlike other commercially available fructosamine assays.
Soluble transferrin receptor (sTfR) is a marker of iron status. In iron deficiency anaemia, sTfR levels are significantly increased, however remain normal in the anaemia of inflammation. Consequently, sTfR measurement is useful in the differential diagnosis of microcytic anaemia.
Acetaminophen is a commonly used medicine for pain-relief. During cold and flu season, it is common to resort to pain-relief medicines to relieve headaches, and ache and pain symptoms associated with a cold or flu as there is no cure. However, the therapeutic range for acetaminophen is 10-30 mg/l, which is small and very easy to go over. During cold and flu season, it is important to monitor the amount of paracetamol entering your body as acetaminophen is more dangerous than suspected. At therapeutic levels, acetaminophen does not produce any adverse effects, however, long-term treatment, prolonged use, and taking a few more than the recommended dose can be severely damaging and fatal. Accidental acetaminophen overdose took the lives of 1,500 people in the U.S between 2001 and 2010. The Randox Acetaminophen assay is used to determine the concentration levels of acetaminophen in the blood to determine if an overdose has taken place.
It is commonly recognised that acetaminophen overdose causes hepatotoxicity, but it is less commonly recognised that it can also cause nephrotoxicity in less than 2% of patients. Nephrotoxicity is toxicity of the kidneys and is often associated with a reduced amount of glutathione which is important for normal cellular metabolism in the kidneys. The Randox Glutathione Reductase assay is required for the regeneration of reduced glutathione. Glutathione is often discussed in association with the Randox Glutathione Peroxidase, which requires reduced glutathione for activation. Both Glutathione reagents are unique to Randox.
Acute renal failure due to acetaminophen manifests as acute tubular necrosis, which can occur alone or in combination with hepatic necrosis. Nephrotoxicity can also occur when the therapeutic levels of acetaminophen are not exceeded. This most commonly occurs when acetaminophen is taken in combination with alcohol. Upon testing acetaminophen levels and the results fall within the therapeutic range, the Randox Ethanol assay can test alcohol levels to determine if a combination of alcohol and acetaminophen caused nephrotoxicity. Renal impairment may be more common than previously suspected as acute renal failure occurs in 10-40% of patients with severe hepatic necrosis. Upon testing acetaminophen to determine toxicity, Randox also offer the following renal tests to test for nephrotoxicity:
For more information visit: https://www.randox.com/acetaminophen
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So far in our inflammatory biomarker series, we have considered the clinical significance of measuring rheumatoid factor (RF) and C-reactive protein (CRP) to detect inflammation. Inflammation, either chronic or acute, is the body’s immune response to protect against harmful stimuli such as damaged cells, irritants or pathogens and can be present in a range of diseases and conditions.1 Measuring inflammatory biomarkers can assist clinicians in the identification of a particular disease or can provide a marker of treatment response. In this blog, we consider the role of antioxidants and identify relevant biomarkers which may be linked to inflammatory states.
What is an antioxidant?
An antioxidant is a molecule that inhibits the oxidation of other molecules. Oxidation is a chemical reaction that produces free radicals, which are groups of very reactive molecules that can interrupt important cellular processes. Antioxidants are commonly referenced with regards to food, however antioxidants are also found in the body in the form of enzymes. Their purpose is to protect against the effects of oxidative stress to reduce damage from free radicals.
What is the link between antioxidants and inflammation?
Oxidative stress and the inflammation associated with it are the cause of most human disease. This would suggest that free radicals are implicated in many disease states for example rheumatoid arthritis, asthma, stroke, or cancer. Therefore antioxidants are important to protect against oxidative damage, thus reducing the risk of inflammation. There are a number of antioxidants which play a protective role the body, such as ferritin, superoxide dismutase, transferrin, uric acid and glutathione reductase.
Ferritin is responsible for storing iron and releasing it when required. Ordinarily, ferritin is found inside blood cells with only a small amount circulating in the blood. Ferritin is clinically significant at both high and low levels. Low levels of ferritin can highlight an iron deficiency which causes anaemia. Whereas elevated levels of ferritin can be a result of conditions such as rheumatoid arthritis, haemochromatosis, liver disease, metabolic syndrome, type 2 diabetes and renal failure.2 As ferritin is an acute phase reactant, levels will be elevated in any inflammatory state within the body.3
Transferrin is a protein that is responsible for binding and transporting iron in the blood. Transferrin acts as a preventative antioxidant as it binds with free iron, removing it from the bloodstream. This is a critical function, as free iron can stimulate the production of harmful free radicals. As transferrin is a negative acute phase protein, lower levels are associated with inflammatory conditions.7
Superoxide is a by-product of oxygen metabolism and is one of the most damaging free radicals in the body as it can cause cell damage. Superoxide Dismutase (SOD) is an enzyme which catalyses the breakdown of superoxide into a less damaging oxygen or hydrogen peroxide. Therefore SOD preforms a vital defensive function to reduce oxidative stress.4 Extensive research exists which links oxidative stress to chronic inflammation, which can be a contributing factor to diabetes, arthritis, cardiovascular disease and cancer.5 Therefore if levels of superoxide dismutase are low, patients are at risk inflammation, for example, SOD levels are significantly less in rheumatoid arthritis patients.6
Glutathione reductase is found in red blood cells and plays a key role in maintaining cell function and preventing oxidative stress in human cells. Reduced levels of glutathione reductase can contribute to the prevalence of inflammatory states, suggesting that adequate levels of glutathione reductase are essential for optimal function of the immune system. 7, 8
Uric acid is a waste product produced when the body breaks down chemical compounds called purines. It is a scavenging antioxidant that acts by inactivating free radicals. Elevated levels of uric acid is commonly associated with gout, a type of arthritis which is caused when crystals of sodium urate form inside joints causing rapid and painful inflammation.9 Other research has indicated that elevated levels of uric acid is associated with increased risk of cardiovascular disease.
Total Antioxidant Status (TAS)
TAS is a measurement of antioxidant function rather than quantity and considers the cumulative effect of all antioxidants present. The antioxidant defence system has many components, and a deficiency in any of these components can cause a reduction in the overall antioxidant status of an individual.10 Reduction in total antioxidant status has been implicated in several disease states including cancer, CVD, Arthritis and Alzheimer’s disease.
As demonstrated above, different types of antioxidants can help reduce different types of inflammation. Antioxidant tests can be requested from any doctor, who may also review dietary intake, investigate any symptoms and advise if testing is required. If antioxidant levels are found to be inadequate, improving them can be easily done through dietary changes, and can help reduce a body’s overall inflammation.
For health professionals
Randox Laboratories offer a range of diagnostic reagents for antioxidant testing to assist in the diagnosis of inflammatory diseases. Randox offer a complete diagnostic package with applications for a range of biochemistry analysers and a selection of kit sizes, controls and calibrators available. Available tests include: Ferritin, Transferrin, Superoxide Dismutase (Ransod), Glutathione Reductase, Uric Acid, and Total Antioxidant Status (TAS).
- Nordqvist, C., Inflammation: Causes, Symptoms and Treatment. Medical News Today, 2015, https://goo.gl/rT4WS9 (accessed 16 January 2017)
- Koperdanova, M., Interpreting raised serum ferritin levels, British Medical Journal, 2015, https://doi.org/10.1136/bmj.h3692 (accessed 2 February 2017)
- Nall, R. Ferritin Level Blood Test, Health Line, 2015, https://goo.gl/XGcW9P (accessed 2 February 2017)
- Yasui, K. and Baba, A., Therapeutic potential of superoxide dismutase (SOD) for resolution of inflammation. Inflammation Research. Vol.55, No.9, pp.359-363, 2006, 1007/s00011-006-5195-y (accessed 2 February 2017)
- Reuter, S., Gupta, S.C., Chaturvedi, M.M., Aggarwal, B.B., Oxidative stress, inflammation and cancer: How are they linked? Free Radic Biol Med. 2010, 1; 49(11):1603-1616 https://goo.gl/Uez3JZ (accessed 2 February 2017)
- Bae SC, Kim SJ, Sung MK., Inadequate antioxidant nutrient intake and altered plasma antioxidant status of rheumatoid arthritis patients. J Am Coll Nutr. 2003 Aug;22(4):311-5
- Reynolds, B., Glutathione for inflammatory respsonse, FX Medicine, 2015, Available from: https://goo.gl/2YAv5l (accessed 3 February 2017)
- Morris, G., Anderson, G., Dean, O. et al., The glutathione system: a new drug target in neuroimmune disorders. Mol Neurobiol 2014;50(3):1059-1084, Available from: https://goo.gl/PDSgwv (accessed 3 February 2017)
- Malaghan Institute, Uric acid – a new look at an old marker of inflammation, Malaghan Institute of Medical Research, 2013, Available from: https://goo.gl/P6NfXP
- Li, Y., Browne, R.W., Bonner, M.R., Deng, F., Tian, L., Mu, L., Positive Relationship between Total Antioxidant Status and Chemokines Observed in Adults. Oxid Med Cell Longev. 2014, Available from: https://goo.gl/rmj5MB (accessed 9 February 2017)
A dedicated Glutathione Peroxidase control for use in the routine monitoring of the Randox Ransel assay on clinical chemistry analysers.
Features & Benefits
- Lyophilised for enhanced stability
- Bovine based whole blood
- Stable to expiry date at 2°C – 8°C
- Reconstituted stability of 3 days at 2°C – 8°C
- Glutathione Peroxidase