Description
Introduction: CD5 Antigen-like (CD5L), also known as Sp alpha, is a secreted protein that is a member of the SCSR (scavenger receptor cysteine rich) superfamily. CD5L/Sp alpha exhibits a high degree of homology with the extracellular regions of CD5 and CD6, exhibiting three SCSR domains. CD5L/Sp alpha is expressed in lymphoid tissues and associates with immunoglobulins of IgM isotype in the plasma/serum.
Principle of the Assay: The microtiter plate provided in this kit has been pre-coated with an antibody specific to CD5L. Standards or samples are then added to the appropriate microtiter plate wells with a biotin-conjugated antibody preparation specific for CD5L and Avidin conjugated to Horseradish Peroxidase (HRP) is added to each microplate well and incubated. Then a TMB (3,3',5,5' tetramethyl-benzidine) substrate solution is added to each well. Only those wells that contain CD5L, biotin-conjugated antibody and enzyme-conjugated Avidin will exhibit a change in color. The enzyme-substrate reaction is terminated by the addition of a sulphuric acid solution and the color change is measured spectrophotometrically at a wavelength of 450 nm +/- 2 nm. The concentration of CD5L in the samples is then determined by comparing the O.D. of the samples to the standard curve