Cat No.: 31330 Other Names: Leukocyte Elastase, Serine Elastase, Elaszym, ELANE
Introduction
Neutrophil elastase (NE), also known as leukocyte elastase, serine elastase, and elaszym, is one of the hematopoietic serine
proteases localized in the primary granules of polymorphonuclear neutrophils (PMNs). The primary function of NE is recognized as
to participate in the clearance of invaded pathogens through its intracellular and extracellular killing as well as antimicrobial activity,
and the degradation of extracellular matrix components, including elastin, collagens, fibroncetin and proteoglycans.
Principle of the Assay
This assay is a quantitative sandwich ELISA. The immunoplate is pre-coated with a polyclonal antibody specific for human NE.
Standards and samples are pipetted into the wells and any human NE present is bound by the immobilized antibody. After washing
away any unbound substances, a horseradish peroxidase (HRP)-linked polyclonal antibody specific for human NE is added to the
wells. After a final wash step, an HRP substrate solution is added and colour develops in proportion to the amount of human NE
bound initially. The assay is stopped and the optical density of the wells determined using a microplate reader. Since the increases
in absorbance are directly proportional to the amount of captured human NE, the unknown sample concentration can be interpolated from a reference curve included in each assay.
Assay Performance
A. Typical representation of standard curve
The following standard curve is provided for demonstration only. A standard curve should be generated for each set of sample
assay.
Human NE (ng/mL) | Absorbance (450 nm) | Blanked Absorbance |
0 | 0.07 | 0 |
0.156 | 0.105 | 0.035 |
0.312 | 0.142 | 0.072 |
0.625 | 0.225 | 0.155 |
1.25 | 0.379 | 0.309 |
2.5 | 0.72 | 0.65 |
5 | 1.3 | 1.23 |
10 | 2.463 | 2.393 |
Publications Citing This Product
1. Elie AG, Bloksgaard M, Sun WY, Yang K, Man AW, Xu A, Irmukhamedov A, Riber LP, Wang Y, De Mey JG. Local enrichment of
fatty acid-binding protein 4 in the pericardial cavity of cardiovascular disease patients. PloS one. 2018 Nov 5;13(11):e0206802.
2. Qian LL, Wu L, Zhang L, Zhang J, Zhou J, Li YH, Fang QC, Li HT, Jia WP. Serum biomarkers combined with ultrasonography for
early diagnosis of non-alcoholic fatty liver disease confirmed by magnetic resonance spectroscopy. Acta Pharmacologica Sinica.
2020 Apr;41(4):554-60.
3. Ong KL, Wu L, Januszewski AS, O’Connell R, Xu A, Scott RS, Sullivan DR, Rye KA, Li H, Ma RC, Li L. The relationship of
neutrophil elastase and proteinase 3 with risk factors, and chronic complications in type 2 diabetes: A Fenofibrate Intervention and
Event Lowering in Diabetes (FIELD) sub-study. Diabetes and Vascular Disease Research. 2021 Jul;18(4):14791641211032547.