预期应用
ELISA法定量测定大鼠血清、血浆、细胞培养物上清或其它相关液体中IL-13含量。
实验原理
本试剂盒应用双抗体夹心酶标免疫分析法测定标本中IL-13水平。用纯化的抗体包被微孔板，制成固相抗体，往包被单抗的微孔中依次加入IL-13抗原、生物素化的抗大鼠IL-13抗体、HRP标记的亲和素，经过彻底洗涤后用底物TMB显色。TMB在过氧化物酶的催化下转化成蓝色，并在酸的作用下转化成最终的黄色。颜色的深浅和样品中的IL-13呈正相关。用酶标仪在450nm波长下测定吸光度（OD值），计算样品浓度。
Intended use
This immunoassay kit allows for the specific measurement of rat IL-13 concentrations in cell culture supernates, serum, and plasma.
Introduction
Interleukin 13 (IL-13) is produced primarily by activated T lymphocytes. It shows approximately 30% amino acid (aa) sequence identity with IL-4 and shares many biological properties with IL-4. IL-13 has multiple effects on the differentiation and functions of monocytes/macrophages. It can suppress the cytotoxic functions of monocytes/macrophages and the production of proinflammatory cytokines by monocytes/macrophages. Although rat or mouse IL-13 has effects similar to those of IL-4 on rat B cells, mouse IL-13 has no effect on mouse B cells. Unlike IL-4, which is a growth and differentiation factor for rat and mouse T cells, IL-13 has no effects on either rat or mouse T cells.
The biological effects of IL-13 are mediated by specific high-affinity cell surface receptor complexes. The functional IL-13 receptor complex has been shown to consist of the low-affinity IL-13 receptor α chain and the IL-4 receptor α subunit (IL-4 Rα). This IL-13 receptor complex may also serve as an alternate high-affinity IL-4 receptor complex in IL-4 responsive cells that lack the γ chain.
Test principle
This assay employs the quantitative sandwich enzyme immunoassay technique. A monoclonal antibody specific for IL-13 has been pre-coated onto a microplate. Standards and samples are pipetted into the wells and any IL-13 present is bound by the immobilized antibody. After washing away any unbound substances, an enzyme-linked polyclonal antibody specific for IL-13 is added to the wells. Following a wash to remove any unbound antibody-enzyme reagent, a substrate solution is added to the wells and color develops in proportion to the amount of IL-13 bound in the initial step. The color development is stopped and the intensity of the color is measured. | 
