Pentraxin 3 ELISA Kit


The Pentraxin 3 ELISA Kit is to be used for the quantitative determination of human Pentraxin 3 in plasma samples and cell culture supernatant. The Eagle Biosciences Human Pentraxin 3 ELISA Kit is for research use only and not for diagnostic or therapeutic procedures.

Pentraxin 3 ELISA Kit

The Pentraxin 3 ELISA Kit is For Research Use Only

Sizes: 1×96 wells and 2×96 wells
Sensitivity: 0.04 ng/ml
Standard Range: 0.04 – 10 ng/ml
Incubation Time: 3.5 hours
Sample Type: Plasma and Cell culture supernatants
Sample Size: 100 µl
Alternative Names: PTX3, PTX 3

Assay Background

Pentraxins are a superfamily of acute phase reactants characterized by a pentameric structure. The C-reactive protein (CRP) and serum amyloid P-component (SAP) are well-characterized short Pentraxins, which are produced in the liver in response to inflammatory mediators. Pentraxin 3 (PTX3), also known as Tumor necrosis factor-Stimulated Gene 14 (TSG-14), is the prototypic long Pentraxin, with a high degree of conservation from mouse to man. Human PTX3 encodes a 45 kDa secretory glycoprotein with a 162 amino acid N-terminal extension and a 202 amino acid C-terminal Pentraxin domain. The protein is locally produced and released by a variety of cell types including macrophages, neutrophils, myeloid-derived mesangial cells, synovial cells, smooth muscle cells, alveolar epithelium, and glial cells. PTX3 is induced in response to either inflammatory cytokines interleukin-1 β (IL-1 β) and tumor necrosis factor α (TNFα) or the selected associated molecular patterns (PAMPs). PTX3 has a dual role in the regulation of the innate immune response. Via its C-terminal Pentraxin domain, immobilized PTX3 will bind complement component C1q to induce classical complement activation. However, fluid-phase PTX3 inhibits classical complement activation. Furthermore PTX3 participates in the clearance of apoptic cells. PTX3 is elevated in critically ill patients, with a gradient from systematic inflammatory response syndrome to septic shock, and in several other diseases, such as myocardial infarction, rheumatoid arthritis, atherosclerosis, small vessel vasculitis and psoriasis. Furthermore serum levels of PTX3 are higher in preeclampsia compared with normal pregnancies.

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Additional Information

Assay Principle

The human pentraxin 3 ELISA is a ready-to-use solid-phase enzyme-linked immunosorbent assay based on the sandwich principle with a working time of 3½ hours. The efficient format of 2 plates with twelve disposable 8-well strips allows free choice of batch size for the assay. Samples and standards are captured by a solid bound specific antibody. Biotinylated tracer antibody will bind to captured human pentraxin 3. Streptavidin-peroxidase conjugate will bind to the biotinylated tracer antibody. Streptavidin-peroxidase conjugate will react with the substrate, tetramethylbenzidine (TMB). The enzyme reaction is stopped by the addition of oxalic acid. The absorbance at 450 nm is measured with a spectrophotometer. A standard curve is obtained by plotting the absorbance (linear) versus the corresponding concentrations of the human pentraxin 3 standards (log). The human pentraxin 3 concentration of samples, which are run concurrently with the standards, can be determined from the standard curve.


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