Human CD25/IL-2 R alpha Quantikine ELISA Kit

(23 citations)   
  • Assay Type
    Solid Phase Sandwich ELISA
  • Format
    96-well strip plate
  • Assay Length
    3.5 hours
  • Sample Type & Volume Required Per Well
    Cell Culture Supernates (10 uL), Serum (13 uL), EDTA Plasma (13 uL), Heparin Plasma (13 uL)
  • Sensitivity
    10 pg/mL
  • Assay Range
    78.0 - 5,000 pg/mL (Cell Culture Supernates, Serum, EDTA Plasma, Heparin Plasma)
  • Specificity
    Natural and recombinant human IL-2 sR alpha
  • Cross-reactivity
    < 0.5% cross-reactivity observed with available related molecules.Cross-species reactivity not tested.
  • Interference
    No significant interference observed with available related molecules.
Control Available
Product Summary
The Quantikine Human IL-2 sR alpha Immunoassay is a 3.5 hour solid phase ELISA designed to measure IL-2 sR alpha in cell culture supernates, serum, and plasma. It contains NS0-expressed recombinant human IL-2 sR alpha and antibodies raised against the recombinant factor. This immunoassay has been shown to accurately quantitate the recombinant factor. Results obtained using natural human IL-2 sR alpha showed linear curves that were parallel to the standard curves obtained using the recombinant Quantikine kit standards. These results indicate that this kit can be used to determine relative mass values for natural human IL-2 sR alpha.

Intra-Assay Precision (Precision within an assay) Three samples of known concentration were tested on one plate to assess intra-assay precision.
Inter-Assay Precision (Precision between assays) Three samples of known concentration were tested in separate assays to assess inter-assay precision.
Cell Culture Supernates, Serum, EDTA Plasma, Heparin Plasma
Intra-Assay Precision Inter-Assay Precision
Standard Deviation12.737.510813.638.1183


The recovery of IL-2 sR alpha spiked to three different levels throughout the range of the assay in various matrices was evaluated.

Sample Type Average % Recovery Range %
Cell Culture Media (n=5) 105 93-118
EDTA Plasma (n=5) 103 91-113
Heparin Plasma (n=5) 104 98-113
Serum (n=5) 105 99-116
To assess the linearity of the assay, five samples containing or spiked with high concentrations of IL-2 sR alpha in various matrices were diluted with Calibrator Diluent to produce samples with values within the dynamic range of the assay.
Human CD25/IL-2 R alpha Quantikine ELISA Kit
Preparation and Storage
  • Storage
    Store the unopened product at 2 - 8 °C. Do not use past expiration date.
Background: CD25/IL-2 R alpha
CD25/IL-2 receptor alpha is a transmembrane protein that associates with IL-2 R beta/CD122 and the Common gamma Chain/CD132 on activated T cells and regulatory T cells (Treg). The Common gamma chain is a shared subunit in the receptors for IL-4, -7, -9, -15, and -21. IL-2 R alpha is required for mediating IL-2 induced effects including T cell proliferation, activation induced cell death (AICD) of autoreactive naive T cells, and the development of CD4+CD25+ Treg which contribute to peripheral T cell homeostasis. A soluble form of IL-2 R alpha can be generated by proteolytic cleavage of the cell surface receptor.
    • Long Name
      Interleukin 2 Receptor alpha
    • Entrez Gene IDs
      3559 (Human); 16184 (Mouse); 25704 (Rat); 403870 (Canine);
    • Alternate Names
      CD25 antigen; CD25; IDDM10; IL-2 R alpha; IL-2 receptor subunit alpha; IL2R alpha; IL-2R subunit alpha; IL2R; IL2RA; IL-2Ra; IL-2-RA; IL2-RA; interleukin 2 receptor, alpha; interleukin-2 receptor subunit alpha; p55; TAC antigen; TCGFR;
    Related Research Areas
    Assay Procedure
    Refer to the product for complete assay procedure.

    Bring all reagents and samples to room temperature before use. It is recommended that all samples, standards, and controls be assayed in duplicate.
    1.   Prepare all reagents, standard dilutions, and samples as directed in the product insert.
    2.   Remove excess microplate strips from the plate frame, return them to the foil pouch containing the desiccant pack, and reseal.

    3. 100 µL Assay Diluent
    4.   Add 100 µL of Assay Diluent to each well.

    5. 50 µL Standard, Control, or Sample
    6.   Add 50 µL of Standard, control, or sample to each well. Proceed to the next step. Do not incubate or wash.

    7. 100 µL Conjugate
    8.   Add 100 µL of Conjugate to each well. Cover with a new plate sealer, and incubate at room temperature for 3 hours.
    9.   Aspirate each well and wash, repeating the process 3 times for a total of 4 washes.

    10. 200 µL Substrate Solution
    11.   Add 200 µL Substrate Solution to each well. Incubate at room temperature for 20 minutes. PROTECT FROM LIGHT.

    12. 50 µL Stop Solution
    13.   Add 50 µL of Stop Solution to each well. Read at 450 nm within 30 minutes. Set wavelength correction to 540 nm or 570 nm.

    R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

    Showing Results 1 - 10 of 23
    Filter your results:

    Sample Type
    1. Elevated levels of CXCL10 in the Periodic Fever, Aphthous stomatitis, Pharyngitis and cervical Adenitis syndrome (PFAPA) during and between febrile episodes; an indication of a persistent activation of the innate immune system.
      Authors: Forsvoll J, Kristoffersen E, Oymar K
      Pediatr Rheumatol Online J, 2013;11(1):38.
      Species: Human
      Sample Type: Plasma
    2. Malignant transformation of CD4+ T lymphocytes mediated by oncogenic kinase NPM/ALK recapitulates IL-2-induced cell signaling and gene expression reprogramming.
      Authors: Marzec M, Halasa K, Liu X, Wang H, Cheng M, Baldwin D, Tobias J, Schuster S, Woetmann A, Zhang Q, Turner S, Odum N, Wasik M
      J Immunol, 2013;191(12):6200-7.
      Species: Human
      Sample Type: cell culture supernate
    3. Synergistic antitumor activity of anti-CD25 recombinant immunotoxin LMB-2 with chemotherapy.
      Authors: Singh R, Zhang Y, Pastan I, Kreitman RJ
      Clin. Cancer Res., 2012;18(1):152-60.
      Species: Human
      Sample Type: Serum
    4. Human CD1c (BDCA-1)+ myeloid dendritic cells secrete IL-10 and display an immuno-regulatory phenotype and function in response to Escherichia coli.
      Authors: Kassianos AJ, Hardy MY, Ju X, Vijayan D, Ding Y, Vulink AJ, McDonald KJ, Jongbloed SL, Wadley RB, Wells C, Hart DN, Radford KJ
      Eur. J. Immunol., 2012;42(6):1512-22.
      Species: Human
      Sample Type: Cell Culture Supernates
    5. A novel role for IL-22R1 as a driver of inflammation.
      Authors: Savan R, McFarland AP, Reynolds DA
      Blood, 2011;117(2):575-84.
      Species: Mouse
      Sample Type: Serum
    6. Phase 2 study of cladribine followed by rituximab in patients with hairy cell leukemia.
      Authors: Ravandi F, O'Brien S, Jorgensen J, Pierce S, Faderl S, Ferrajoli A, Koller C, Challagundla P, York S, Brandt M, Luthra R, Burger J, Thomas D, Keating M, Kantarjian H
      Blood, 2011;118(14):3818-23.
      Species: Human
      Sample Type: Serum
    7. Presence of IL-5 protein and IgE antibodies to staphylococcal enterotoxins in nasal polyps is associated with comorbid asthma.
      Authors: Bachert C, Zhang N, Holtappels G, De Lobel L, Van Cauwenberge P, Liu S, Lin P, Bousquet J, Van Steen K
      J. Allergy Clin. Immunol., 2010;126(5):962.
      Species: Human
      Sample Type: Tissue Homogenates
    8. Defucosylated humanized anti-CCR4 monoclonal antibody KW-0761 as a novel immunotherapeutic agent for adult T-cell leukemia/lymphoma.
      Authors: Ishii T, Ishida T, Utsunomiya A
      Clin. Cancer Res., 2010;16(5):1520-31.
      Species: Mouse
      Sample Type: Plasma
    9. Safety and clinical effect of subcutaneous human interleukin-21 in patients with metastatic melanoma or renal cell carcinoma: a phase I trial.
      Authors: Schmidt H, Brown J, Mouritzen U, Selby P, Fode K, Svane IM, Cook GP, Mollerup DH, Geertsen PF
      Clin. Cancer Res., 2010;16(21):5312-9.
      Species: Human
      Sample Type: Serum
    10. Effective treatment of a murine model of adult T-cell leukemia using depsipeptide and its combination with unmodified daclizumab directed toward CD25.
      Authors: Chen J, Zhang M, Ju W, Waldmann TA
      Blood, 2009;113(6):1287-93.
      Species: Mouse
      Sample Type: Serum
    11. Urinary proinflammatory cytokine response in renal transplant recipients with polyomavirus BK viruria.
      Authors: Sadeghi M, Daniel V, Schnitzler P, Lahdou I, Naujokat C, Zeier M, Opelz G
      Transplantation, 2009;88(9):1109-16.
      Species: Human
      Sample Type: Urine
    12. Smoking, inflammatory patterns and postprandial hypertriglyceridemia.
      Authors: Kabagambe EK, Ordovas JM, Tsai MY, Borecki IB, Hopkins PN, Glasser SP, Arnett DK
      Atherosclerosis, 2009;203(2):633-9.
      Species: Human
      Sample Type: Serum
    13. Expression and release of soluble HLA-E is an immunoregulatory feature of endothelial cell activation.
      Authors: Coupel S, Moreau A, Hamidou M, Horejsi V, Soulillou JP, Charreau B
      Blood, 2007;109(7):2806-14.
      Species: Human
      Sample Type: Serum
    14. Inflammatory markers and incident fracture risk in older men and women: the Health Aging and Body Composition Study.
      Authors: Cauley JA, Danielson ME, Boudreau RM, Forrest KY, Zmuda JM, Pahor M, Tylavsky FA, Cummings SR, Harris TB, Newman AB
      J. Bone Miner. Res., 2007;22(7):1088-95.
      Species: Human
      Sample Type: Serum
    15. Short communication: decreasing soluble CD30 and increasing IFN-gamma plasma levels are indicators of effective highly active antiretroviral therapy.
      Authors: Sadeghi M, Susal C, Daniel V, Naujokat C, Zimmermann R, Huth-Kuhne A, Opelz G
      AIDS Res. Hum. Retroviruses, 2007;23(7):886-90.
      Species: Human
      Sample Type: Plasma
    16. An open-label, two-arm, phase I trial of recombinant human interleukin-21 in patients with metastatic melanoma.
      Authors: Davis ID, Skrumsager BK, Cebon J, Nicholaou T, Barlow JW, Moller NP, Skak K, Lundsgaard D, Frederiksen KS, Thygesen P, McArthur GA
      Clin. Cancer Res., 2007;13(12):3630-6.
      Species: Human
      Sample Type: Serum
    17. Effective treatment of a murine model of adult T-cell leukemia using 211At-7G7/B6 and its combination with unmodified anti-Tac (daclizumab) directed toward CD25.
      Authors: Zhang Z, Zhang M, Garmestani K, Talanov VS, Plascjak PS, Beck B, Goldman C, Brechbiel MW, Waldmann TA
      Blood, 2006;108(3):1007-12.
      Species: Human
      Sample Type: Serum
    18. Effective therapy for a murine model of human anaplastic large-cell lymphoma with the anti-CD30 monoclonal antibody, HeFi-1, does not require activating Fc receptors.
      Authors: Zhang M, Yao Z, Zhang Z, Garmestani K, Goldman CK, Ravetch JV, Janik J, Brechbiel MW, Waldmann TA
      Blood, 2006;108(2):705-10.
      Species: Human
      Sample Type: Serum
    19. Activating Fc receptors are required for antitumor efficacy of the antibodies directed toward CD25 in a murine model of adult t-cell leukemia.
      Authors: Zhang M, Zhang Z, Garmestani K, Goldman CK, Ravetch JV, Brechbiel MW, Carrasquillo JA, Waldmann TA
      Cancer Res., 2004;64(16):5825-9.
      Species: Human
      Sample Type: Serum
    20. Thymus and activation-regulated chemokine (TARC/CCL17) produced by mouse epidermal Langerhans cells is upregulated by TNF-alpha and IL-4 and downregulated by IFN-gamma.
      Authors: Xiao T, Fujita H, Saeki H, Mitsui H, Sugaya M, Tada Y, Kakinuma T, Torii H, Nakamura K, Asahina A, Tamaki K
      Cytokine, 2003;23(4):126-32.
      Species: Human
      Sample Type: Serum
    21. Comparative analysis of CA125, tissue polypeptide specific antigen, and soluble interleukin-2 receptor alpha levels in sera, cyst, and ascitic fluids from patients with ovarian carcinoma.
      Authors: Sedlaczek P, Frydecka I, Gabrys M, Van Dalen A, Einarsson R, Harlozinska A
      Cancer, 2002;95(9):1886-93.
      Species: Human
      Sample Type: Ascites
    22. Age-related autoantibody production in a nonhuman primate model.
      Authors: Attanasio R, Brasky KM, Robbins SH, Jayashankar L, Nash RJ, Butler TM
      Clin. Exp. Immunol., 2001;123(3):361-5.
      Species: Primate-Papio cynocephalus anubis (baboon)
      Sample Type: Serum
    23. Medium-dose UVA1 cold-light phototherapy in the treatment of severe atopic dermatitis.
      Authors: von Kobyletzki G, Pieck C, Hoffmann K, Freitag M, Altmeyer P
      J. Am. Acad. Dermatol., 1999;41(6):931-7.
      Species: Human
      Sample Type: Serum
    Expand to show all
    ELISA Controls
    Description Application Cat# Citations Images  

    Quantikine Immunoassay Control Group 2

    Ctrl QC05
    View Sizes & Prices
    Catalog# Size Price Stock Quantity
    Loading Information....
    Supplemental ELISA Products
    Description Application Cat# Citations Images  

    Quantikine Wash Buffer 1

    ELISA WA126 5
    View Sizes & Prices
    Catalog# Size Price Stock Quantity
    Loading Information....

    Have you used Human CD25/IL-2 R alpha Quantikine ELISA Kit?

    Submit a review and receive a $25 amazon gift card if you include an image - $10 Amazon card for reviews without an image. Limited to verified customers in USA, Canada and Europe.

    Order Details

    Contact Information

    Certificate of Analysis Lookup

    The document you requested is not available online. Please enter the Catalog Number and Lot Number below to have a document emailed to you at the address provided

    Certificate of Analysis Lookup

    Research Areas of Interest
    R&D Systems Guarantee

    Customers Who Viewed
    This Item Also Viewed


    Customer Information