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EK000075-EK0573: Human soluble CD40L ELISA Kit
Range 62.5pg/ml-4000pg/ml
Sensitivity < 6pg/ml
Specificity: no detectable cross-reactivity with any other cytokine.
Application: for quantitative detection of human CD40L in sera, plasma, body fluids, tissue lysates or cell culture supernates.
Expiration: four months at 4°C and eight months at -20°C.
Background
CD40 ligand (CD40L) is a type II membrane protein of 261 amino acids on activated T cells that induces B cell proliferation and immunoglobulin secretion. It has homology with tumour necrosis factor-alpha and -beta, and has important functions in B-cell activation and differentiation. Human CD40L with 5 exons, is mapped to the proximal region of the mouse X chromosome on Xq26.3-27.1, and can be detected on T cells but is absent from B cells and monocytes. Since CD40L is expressed on platelets and released from them on activation, its predictive value as a marker for clinical outcome and the therapeutic effect of inhibition of glycoprotein IIb /IIIa receptor in patients with acute coronary syndromes was investigated. The soluble CD40L may be involved in the process of restenosis and that it exerts its effect by triggering a complex group of inflammatory reactions on endothelial and mononuclear cells.CD40L plays a central role in the pathophysiology of acute coronary syndromes, and has a role in the pathogenesis of coronary artery lesions.
Principle
The Human soluble CD40L ELISA Kit is based on standard sandwich enzyme-linked immune-sorbent assay technology. The target specific antibodies are precoated onto 96-well plates. The target from the sample is bound to the microwell. The biotinylated target specific detection antibodies are added to the microwells and followed by washing with the PBS or TBS buffer. Avidin-Biotin-Peroxidase Complex is added and unbound conjugates are washed away with the PBS or TBS buffer. TMB, the HRP (horseradish peroxidase) substrate, is used to visualize color change resulting from the HRP enzymatic reaction. TMB is catalyzed by HRP to produce the blue color. The color changes into yellow after the acidic stop solution is added. The density of the yellow color is proportional to the target amount from the sample captured in the microwells.
Reference
1.Allen,R.C.;Armitage,R.J.;Conley,M.E.;Rosenblatt,H.;Jenkins,N.A.;Copeland,N.G.;Bedell,M.A.;Edelhoff,S.;Disteche,C.M.;Simoneaux,D.K.;Fanslow,W.C.;Belmont,J.;Spriggs,M.K.:CD40 ligand gene defects responsible for X-linked hyper-IgM syndrome. Science 259: 990-993, 1993.
2.Cipollone,F.;Ferri,C.;Desideri,G.;Paloscia,L.;Materazzo,G.;Mascellanti,M.;Fazia,M.;Iezzi,A.;Cuccurullo,C.;Pini,B.;Bucci,M.;Santucci,A.;Cuccurullo,F.;Mezzetti,A.:Preprocedural level of soluble CD40L is predictive of enhanced inflammatory response and restenosis after coronary angioplasty. Circulation 108: 2776-2782, 2003.
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