Human T Cell No Atnibody

Description: Double-strand breaks (DSB) in DNA are among the most dangerous types of DNA damage occuring within cells. One of the earliest cellular responses to double-strand breaks is the phosphorylation of a histone variant, H2AX, at the sites of DNA damage. Within seconds Ser139 is phosphorylated when DSBs are induced in mammalian cells. Phosphorylation of this serine residue causes chromatin condensation and appears to play a critical role in the recruitment of repair or damage-signaling factors to the DNA damage sites. The OxiSelect DNA Double-Strand Break Staining Kit provides an easy-to-use method for detecting the presence of DSBs in cells cultured in microtiter plates. Double strand breaks can be detected in just a few hours by immunofluorescence staining of the phosphorylated histone H2AX.

Description: Our OxiSelect UV-Induced DNA Damage ELISA Kit measures the formation of cyclobutane pyrimidine dimers (CPD) in DNA isolated from cells or tissues. Standards or unknown DNA samples are first heat denatured before adsorbed onto a 96-well DNA binding plate.  The sample or standard are then probed with an anti-CPD antibody, followed by an HRP conjugated secondary antibody. 

Description: Our OxiSelect UV-Induced DNA Damage ELISA Kit measures 6-4PP formation in DNA isolated from cells or tissue. Standards or unknown DNA samples are first heat denatured before adsorbed onto a 96-well DNA binding plate.  The sample or standard is then probed with an anti-6-4PP antibody, followed by an HRP conjugated secondary antibody. 

Description: DNA damage can manifest in the formation of apurinic or apyrimidinic (AP or abasic) sites. Such spontaneous base loss in mammalian cells has been estimated at between 50,000 and 200,000 sites per day. Unrepaired abasic sites can inhibit transcription and may be mutagenic. Our OxiSelect Oxidative DNA Damage Quantitation Kit provides a simple, user-friendly method for the quantitaiton DNA damage in the form of abasic sites. The assay uses an Aldehyde Reactive Probe (ARP) to specifically react with an aldehyde group on the open ring of the AP site. This allows the AP site to be labeled with Biotin, followed by detection with Streptavidin-Enzyme conjugate.

Description: Recently oxidative RNA damage has been described in conjunction with a wide variety of neurological diseases including Alzheimer?s disease, Parkinson?s disease, Dementia with Lewy Bodies, prion disease, and subacute sclerosing panencephalitis. We have developed an easy-to-use ELISA for the detection of the most common marker of RNA damage: 8-hydroxyguanosine (8-OHG).

Description: Our OxiSelect Cellular UV-Induced DNA Damage ELISA Kit mesaures the formation of cyclobutane pyrimidine dimers (CPD) in intact cells. Cells are first seeded in a 96-well tissue culture plate. Wells are then UV irradiated to induce DNA damage. After fixation and denaturation, cells containing the DNA lesions are probed with an anti-CPD antibody, followed by an HRP conjugated secondary antibody.

Description: Our OxiSelect Cellular UV-Induced DNA Damage Staining Kit measures the formation of cyclobutane pyrimidine dimers (CPD) by immunofluorescence. Cells are first seeded in a 96-well tissue culture plate. Wells are then UV irradiated to induce DNA damage. After fixation and denaturation, cells containing the DNA lesions are probed with an anti-CPD antibody, followed by a FITC conjugated secondary antibody. The unbound secondary antibody is removed during a wash step, and stained cells can then be visualized with a fluorescence microscope.

Description: Our OxiSelect Cellular UV-Induced DNA Damage ELISA Kit measures the formation of 6-4PP in intact cells in a 96-well ELISA plate-based format. Cells are first seeded in a 96-well tissue culture plate. Wells are then UV irradiated to induce DNA damage. After fixation and denaturation, cells containing the DNA lesions are probed with an anti-6-4PP antibody, followed by an HRP conjugated secondary antibody. 

Description: Our OxiSelect Cellular UV-Induced DNA Damage Staining Kit measures the formation of 6-4PP structures in DNA by immunofluorescence. Cells are first seeded in a 96-well tissue culture plate. Wells are then UV irradiated to induce DNA damage. After fixation and denaturation, cells containing the DNA lesions are probed with an anti-6-4PP antibody, followed by a FITC conjugated secondary antibody. The unbound secondary antibody is removed during a wash step, and stained cells can then be visualized with a fluorescence microscope.

Description: The TBARS (Thiobarbituric Acid Reactive Substances) assay is well-established for screening and monitoring lipid peroxidation. MDA forms a 1:2 adduct with thiobarbituric acid; the MDA-TBA adduct can then be measured. Our OxiSelect TBARS Assay Kit provides a much more user-friendly protocol to measure the MDA-TBA adduct. Reaction volumes are much smaller than the traditional assay, so much less sample is required. Also, reactions can be performed in standard polypropylene tubes - no glass tubes or glass marbles are required. Important Note: MDA adducts are not stable long term. For best results test all samples immediately upon collection, or freeze them at -80ºC for up to one month. MDA may be degraded in samples that have been frozen for longer periods; in such cases more reliable results may be obtained from more stable markers of oxidative stress such as protein carbonyl, 8-OHdG or 4-HNE.

Description: 8-iso-Prostaglandin F2alpha (8-isoprostane) is a stable by-product of lipid peroxides generated during oxidative stress. Our OxiSelect 8-Isoprostane Assay Kit provides a convenient method for absolute quantitation in just a few hours. The 8-Isoprostane ELISA is suitable for a variety of sample types including urine, plasma, and cell lysates.

Description: Catalase is a ubiquitous enzyme that destroys hydrogen peroxides formed during oxidative stress. Our OxiSelect Catalase Activity Assay Kit measures catalase activity in less than one hour from a variety of samples including blood, cells and tissues. Each kit provides sufficient reagents to perform up to 500 assays in a 96-well microtiter plate. This includes blanks, catalase standards and unknown samples. The OxiSelect Catalase Activity Assay Kit (Fluorometric) provides a 40-fold increase in sensitivity compared to our colorimetric assay.

Description: Superoxide dismutase (SOD), which catalyzes the dismutation of the superoxide anion into hydrogen peroxide and molecular oxygen, is one of the most important antioxidant enzymes. SOD enzymes are classified into three groups: cytosolic CuZn-SOD, mitochondrial Mn-SOD, and extracellular Ec-SOD. Our OxiSelect Superoxide Dismutase Activity Assay uses a xanthine/xanthine oxidase (XOD) system to generate superoxide anions and a chromagen to produce a water-soluble formazan dye upon reduction by superoxide anions. The superoxide dismutase activity is determined as the inhibition or reduction of chromagen.

Description: Catalase is a ubiquitous enzyme that destroys hydrogen peroxides formed during oxidative stress. Our OxiSelect Catalase Activity Assay Kits measure catalase activity in less than one hour from a variety of samples including blood, cells and tissues. Each kit provides sufficient reagents to perform up to 100 assays in a 96-well microtiter plate, or 50 assays in microcentrifuge tubes. This includes blanks, catalase standards and unknown samples. Direct spectrophotometric detection of catalase activity with ultraviolet light can cause interference from proteins and other biological components. The OxiSelect Catalase Activity Assay Kit (Colorimetric) utilizes visible light (520 nm), which reduces sample interference. The OxiSelect Catalase Activity Assay Kit (Fluorometric) provides a 40-fold increase in sensitivity compared to our colorimetric assay.

Description: The OxiSelect ROS Assay Kit is a cell-based assay for measuring hydroxyl, peroxyl, and other reactive oxygen species activity within a cell. The assay employs the cell-permeable fluorogenic probe DCFH-DA, which diffuses into cells and is deacetylcated by cellular esterases into the non-fluorescent DCFH (Figure 1). In the presence of ROS, DCFH is rapidly oxidized to highly fluorescent DCF. Fluorescence is read on a standard fluorometric plate reader.

Description: The OxiSelect Hydrogen Peroxide/Peroxidase Assay Kit is a sensitive quantitative fluorometric assay for hydrogen peroxide or peroxidase.   In the presence of HRP, ADHP reacts with H2O2 in a 1:1 stoichiometry to produce highly fluorescent Resorufin.  The Resorufin product can be easily read by a fluorescence microplate reader with an excitation of 530-560 nm and an emission of 590 nm, or for absorbance at 560 nm.  Fluorescence values are proportional to the H2O2 or peroxidase levels within the samples.  The H2O2 or peroxidase content in unknown samples is determined by comparison with its respective standard curve.

Description: The ORAC assay is a powerful tool to measure the antioxidant capacity of biomolecules. Our OxiSelect ORAC Activity Assay measures this capacity in less than 2 hours from a wide variety of sample types.