resDetect™ Human Interleukin-21 (IL-21) ELISA Kit (Residue Testing)
背景（Background）
Human Interleukin-21 (IL-21) ELISA Kit (Residue Testing) is based on ELISA sandwich method and designed to detect and quantitative determine of GMP human IL-21 in samples from CAR-T product preparation processing. It contains GMP human IL-21 and a pair of antibodies against the recombinant factor, which are provided by ACROBiosystems. Results are obtained by four parameter logistic curve that were parallel to the standard curves obtained. The verification results indicate that this kit can be used for the quantitative determination of GMP human IL-21 (ACROBiosystems, cat#GMP-L21H25) concentrations. The specificity has been verified.
应用说明（Application）
Human Interleukin-21 (IL-21) ELISA Kit (Residue Testing) was developed for the detection and quantitative determination of GMP human IL-21 in samples from CAR-T product preparation processing.
It is for research use only.
原理（Assay Principles）
This assay kit employs a standard sandwich-ELISA format, providing a rapid detection of IL-21. The kit consists of Pre-coated Anti-IL-21 Antibody Microplate and Human IL-21 Standard and Biotin-Anti-IL-21 Antibody and Streptavidin-HRP and buffers.
Your experiment will include 6 simple steps:
a) Bring all reagents to room temperature(20℃-25℃) before use.
b) Add your sample to the plate and take the Human IL-21 as standard. The samples and standard are diluted by Dilution Buffer.
c) Wash the plate and add the Biotin-Anti-IL-21 Antibody diluted by Dilution Buffer to the plate.
d) Wash the plate and add the Streptavidin-HRP diluted by Dilution Buffer to the plate.
e) Wash the plate and add TMB.
f) Stop the substrate reaction by adding diluted acid. Absorbance (OD) is calculated by the absorbance at 450 nm minus the absorbance at 630 nm to remove background disturbance before statistical analysis. The OD Value reflects the amount of bound protein.
重构方法（Reconstitution）
Please see Certificate of Analysis for details of reconstitution instruction and specific concentration.
存储（Storage）
Unopened kit should be stored at 2°C -8°C upon receiving.
Find the expiration date on the outside packaging and do not use reagents past their expiration date.
The opened kit should be stored per components table. The shelf life is 30 days from the date of opening.
背景（Background）：IL-21
Interleukin-21 (IL-21) is a secreted protein which belongs to the IL-15 / IL-21 family. Interleukin-21 / IL-21 belongs to a family of cytokines that bind to a composite receptor consisting of a private receptor (IL21R) and the common cytokine receptor gamma chain (gamma(C)). Interleukin-21 / IL-21 impacts a number of cell types, including CD8+ memory T cells, NK cells and subsets of CD4 memory T cells. The IL-21R is widely distributed on lympho-haematopoietic cells. IL-21 is a pleiotropic cytokine produced by CD4+ T cells in response to antigenic stimulation. Its action generally enhances antigen-specific responses of immune cells. IL-21 promotes the anti-tumor activity of CD8+ T-cells and NK cells. IL-21 exerts its effect through binding to a specific type I cytokine receptor, IL-21R, which also contains the γ chain (γc) found in other cytokine receptors including IL-2, IL-4, IL-7, IL-9 and IL-15. The IL-21/IL-21R interaction triggers a cascade of events which includes activation of the tyrosine kinases JAK1 and JAK3, followed by activation of the transcription factors STAT1 and STAT3.
