IL-2 and IL-4 assays
Summary
A method is described for the detection and quantification of one of the cytokines in the presence of the other using neutralizing antibodies to murine IL-2 and IL- 4. Since mouse cells do not respond to human IL-4, the use of cell lines is useful in establishing a specific assay for human IL-2. Alternatively, human IL- 4 can be measured using CT.4S cells transfected with the human IL- 4 receptor cD N A , such as CT.h4S cells. These cells respond to IOpgAnl of human IL- 4, as well as to high concentrations (>lOOU/ml) of human IL-2. Author: J.E. Colligan et al, Translated by Xuitao Cao et al. This experiment is from the "Compendium of Immunology Experiments Guide".
Operation method
IL-2 and IL-4 assays
Move
The basic protocol uses CTLL-2 cells to detect IL-2 and IL-4 in mice. Materials
The number of T C G F units was obtained by comparing total T C G F and T C G F units in the presence of anti-IL-4. By comparing the number of units of T C G F in the presence of anti-IL-4 antibody to that of the
IL-2 activity was calculated by comparing the difference in T C G F activity in the presence of anti-IL-4 antibody to the difference in T C G F activity in the presence of both antibodies.
IL-2 activity units can also be calculated from established mouse IL-2 standards.
Generally, CT.4S cells have a good response to IL-2, but the response to IL-4 varies from time to time. CT.4S cells, a variant subline of CT LL-2, respond strongly to IL-4, to a lesser extent to IL-2, and not to other known cytokines (H u -L i ^ W ., 1989); therefore, the use of CT.4S cells in the mouse IL-4 assay is a useful tool in the development of a new cellular factor, the IL-4 assay. 1989); therefore, IL-4 can be specifically detected with high sensitivity using CT.4S. CT.4S can be used to specifically quantify mouse IL-4 from samples containing lOOU/m l of IL-2 or other cytokines. monoclonal antibodies are not required to neutralize IL-4, but are needed to determine the activity caused by IL-4. C T .4S cells do not respond to human IL-4. C T .4S cells were obtained from D n W .E . Paul (Laboratoryof
Immunology, National Insitute of Allergy and Infectious Diseases, Bethesda, M D20892). C T .4S cells were cultured as described in Supporting Scheme 3.
Recombinant Human IL-2 (Amgen)
75c m 2 tissue culture bottle (Corning)
1 . Continuous proliferation of CTCL-2 cells was maintained in RPMI-IO complete medium supplemented with l U/mL of recombinant human IL-2.
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