Human SLPI Quantikine ELISA Kit

(21 citations)   
  • Assay Type
    Solid Phase Sandwich ELISA
  • Format
    96-well strip plate
  • Assay Length
    4.5 hours
  • Sample Type & Volume Required Per Well
    Cell Culture Supernates (100 uL), Serum (10 uL), EDTA Plasma (10 uL), Heparin Plasma (10 uL), Citrate Plasma (10 uL), Urine (20 uL)
  • Sensitivity
    25 pg/mL
  • Assay Range
    62.5 - 4,000 pg/mL (Cell Culture Supernates, Serum, EDTA Plasma, Heparin Plasma, Citrate Plasma, Urine)
  • Specificity
    Natural and recombinant human SLPI
  • 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 SLPI Immunoassay is a 4.5 hour solid phase ELISA designed to measure SLPI in cell culture supernates, serum, plasma, and urine. It contains E. coli-expressed recombinant human SLPI and antibodies raised against the recombinant factor. The kit has been shown to accurately quantitate recombinant human SLPI. Results obtained using natural human SLPI showed linear curves that were parallel to the curves obtained using the recombinant kit standards. These results indicate that this kit can be used to determine relative mass values for natural human SLPI.

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, Citrate Plasma, Urine
Intra-Assay Precision Inter-Assay Precision
Standard Deviation8.737.


The recovery of SLPI was determined in various matrices by mixing high dose samples with low dose samples in ratios of 1:2, 1:1, and 2:1.

Sample Type Average % Recovery Range %
Cell Culture Media (n=5) 94 84-105
Citrate Plasma (n=10) 97 92-102
EDTA Plasma (n=10) 96 87-103
Heparin Plasma (n=10) 106 98-116
Serum (n=10) 98 89-104
Urine (n=25) 98 92-103
To assess the linearity of the assay, the following biological samples containing, or spiked with high concentrations of SLPI, were diluted with Calibrator Diluent and then assayed.
Human SLPI Quantikine ELISA Kit
Preparation and Storage
  • Storage
    Store the unopened product at 2 - 8 °C. Do not use past expiration date.
Background: SLPI
Secretory leukocyte protease inhibitor (SLPI) is found in various secretory fluids including parotid secretions, bronchial, nasal, cervical mucous, and seminal fluid. SLPI is a potent inhibitor of many proteolytic enzymes including the neutrophil proteases, elastase, cathepsin G, chymotrypsin, and trypsin.
    • Long Name
      Secretory Leukocyte Protease Inhibitor
    • Entrez Gene IDs
      6590 (Human); 20568 (Mouse);
    • Alternate Names
      ALK1; ALPProtease inhibitor WAP4; antileukoproteinase; BLPISeminal proteinase inhibitor; HUSI; HUSI-I; Mucus proteinase inhibitor; secretory leukocyte peptidase inhibitor; secretory leukocyte protease inhibitor (antileukoproteinase); Secretory leukocyte protease inhibitor; WAP four-disulfide core domain protein 4; WAP4HUSI-1; WFDC4MPI;
    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. 100 µL Standard, Control, or Sample
    6.   Add 100 µL of Standard, control, or sample to each well. Cover with a plate sealer, and incubate at room temperature for 2 hours.
    7.   Aspirate each well and wash, repeating the process twice for a total of 3 washes.

    8. 200 µL Conjugate
    9.   Add 200 µL of Conjugate to each well. Cover with a new plate sealer, and incubate at room temperature for 2 hours.
    10.   Aspirate and wash 3 times.

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

    13. 50 µL Stop Solution
    14.   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 21
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    Sample Type
    1. High IFN-gamma and low SLPI mark severe asthma in mice and humans.
      Authors: Raundhal M, Morse C, Khare A, Oriss T, Milosevic J, Trudeau J, Huff R, Pilewski J, Holguin F, Kolls J, Wenzel S, Ray P, Ray A
      J Clin Invest, 2015;125(8):3037-50.
      Species: Human
      Sample Type: Cell Culture Supernates
    2. Unexpected Inflammatory Effects of Intravaginal Gels (Universal Placebo Gel and Nonoxynol-9) on the Upper Female Reproductive Tract: A Randomized Crossover Study.
      Authors: Smith-McCune K, Chen J, Greenblatt R, Shanmugasundaram U, Shacklett B, Hilton J, Johnson B, Irwin J, Giudice L
      PLoS ONE, 2015;10(7):e0129769.
      Species: Human
      Sample Type: Endocervical Wick
    3. Regulation of progranulin expression in human microglia and proteolysis of progranulin by matrix metalloproteinase-12 (MMP-12).
      Authors: Suh HS, Choi N, Tarassishin L, Lee SC
      PLoS ONE, 2012;7(4):e35115.
      Species: Human
      Sample Type: Cell Culture Supernates
    4. The relationship between secretory leukocyte protease inhibitor expression and Epstein-Barr virus status among patients with nasopharyngeal carcinoma.
      Authors: Tse KP, Wu CS, Hsueh C
      Anticancer Res., 2012;32(4):1299-307.
      Species: Human
      Sample Type: Serum
    5. Secretory leukocyte protease inhibitor (SLPI) expression and tumor invasion in oral squamous cell carcinoma.
      Authors: Wen J, Nikitakis NG, Chaisuparat R, Greenwell-Wild T, Gliozzi M, Jin W, Adli A, Moutsopoulos N, Wu T, Warburton G, Wahl SM
      Am. J. Pathol., 2011;178(6):2866-78.
      Species: Human
      Sample Type: Cell Culture Supernates
    6. A randomized trial to assess anti-HIV activity in female genital tract secretions and soluble mucosal immunity following application of 1% tenofovir gel.
      Authors: Keller MJ, Madan RP, Torres NM
      PLoS ONE, 2011;6(1):e16475.
      Species: Human
      Sample Type: cervicovaginal lavage
    7. Use of an immunoaffinity-mass spectrometry-based approach for the quantification of protein biomarkers from serum samples of lung cancer patients.
      Authors: Nicol GR, Han M, Kim J, Birse CE, Brand E, Nguyen A, Mesri M, FitzHugh W, Kaminker P, Moore PA, Ruben SM, He T
      Mol. Cell Proteomics, 2008;7(10):1974-82.
      Species: Human
      Sample Type: Serum
    8. The secretory leukocyte protease inhibitor (SLPI) and the secondary granule protein lactoferrin are synthesized in myelocytes, colocalize in subcellular fractions of neutrophils, and are coreleased by activated neutrophils.
      Authors: Jacobsen LC, Sorensen OE, Cowland JB, Borregaard N, Theilgaard-Monch K
      J. Leukoc. Biol., 2008;83(5):1155-64.
      Species: Human
      Sample Type: Cell Lysates
    9. Bacterial vaginosis, not HIV, is primarily responsible for increased vaginal concentrations of proinflammatory cytokines.
      Authors: Mitchell CM, Balkus J, Agnew KJ, Cohn S, Luque A, Lawler R, Coombs RW, Hitti JE
      AIDS Res. Hum. Retroviruses, 2008;24(5):667-71.
      Species: Human
      Sample Type: Vaginal Fluid
    10. Overexpression of a secretory leukocyte protease inhibitor in human gastric cancer.
      Authors: Cheng WL, Wang CS, Huang YH, Liang Y, Lin PY, Hsueh C, Wu YC, Chen WJ, Yu CJ, Lin SR, Lin KH
      Int. J. Cancer, 2008;123(8):1787-96.
      Species: Human
      Sample Type: Plasma
    11. An integrated clinical-genomics approach identifies a candidate multi-analyte blood test for serous ovarian carcinoma.
      Authors: Meinhold-Heerlein I, Bauerschlag D, Zhou Y, Sapinoso LM, Ching K, Frierson H, Brautigam K, Sehouli J, Stickeler E, Konsgen D, Hilpert F, von Kaisenberg CS, Pfisterer J, Bauknecht T, Jonat W, Arnold N, Hampton GM
      Clin. Cancer Res., 2007;13(2):458-66.
      Species: Human
      Sample Type: Serum
    12. PRO 2000 elicits a decline in genital tract immune mediators without compromising intrinsic antimicrobial activity.
      Authors: Keller MJ, Guzman E, Hazrati E, Kasowitz A, Cheshenko N, Wallenstein S, Cole AL, Cole AM, Profy AT, Wira CR, Hogarty K, Herold BC
      AIDS, 2007;21(4):467-76.
      Species: Human
      Sample Type: cervicovaginal lavage
    13. Mucosal innate immune factors in secretions from high-risk individuals immunized with a bivalent gp120 vaccine.
      Authors: Cummins JE, Denniston M, Mayer KH, Pickard R, Novak RM, Graham P, Gurwith M, Orelind K, Ackers ML, Dezzutti CS
      AIDS Res. Hum. Retroviruses, 2007;23(5):748-54.
      Species: Human
      Sample Type: Serum
    14. Arginine-specific gingipains from Porphyromonas gingivalis deprive protective functions of secretory leucocyte protease inhibitor in periodontal tissue.
      Authors: Into T, Inomata M, Kanno Y, Matsuyama T, Machigashira M, Izumi Y, Imamura T, Nakashima M, Noguchi T, Matsushita K
      Clin. Exp. Immunol., 2006;145(3):545-54.
      Species: Human
      Sample Type: Cell Culture Supernates
    15. Differential proteolytic enzyme activity in eosinophilic and neutrophilic asthma.
      Authors: Simpson JL, Scott RJ, Boyle MJ, Gibson PG
      Am. J. Respir. Crit. Care Med., 2005;172(5):559-65.
      Species: Human
      Sample Type: Sputum
    16. Salivary secretory leukocyte protease inhibitor and oral candidiasis in human immunodeficiency virus type 1-infected persons.
      Authors: Chattopadhyay A, Gray LR, Patton LL, Caplan DJ, Slade GD, Tien HC, Shugars DC
      Infect. Immun., 2004;72(4):1956-63.
      Species: Human
      Sample Type: Saliva
    17. Salivary secretory leukocyte protease inhibitor is associated with reduced transmission of human immunodeficiency virus type 1 through breast milk.
      Authors: Farquhar C, VanCott TC, Mbori-Ngacha DA, Horani L, Bosire RK, Kreiss JK, Richardson BA, John-Stewart GC
      J. Infect. Dis., 2002;186(8):1173-6.
      Species: Human
      Sample Type: Saliva
    18. Effect of fluticasone on the elastase:antielastase profile of the normal lung.
      Authors: Kamal AM, Corrigan CJ, Tetley TD, Alaghband-Zadeh J, Smith SF
      Eur. J. Clin. Invest., 2002;32(9):713-9.
      Species: Human
      Sample Type: Upper Alveolar Lavage
    19. Passive transfer of scrub typhus plasma to patients with AIDS: a descriptive clinical study.
      Authors: Watt G, Kantipong P, Jongsakul K, de Souza M, Burnouf T
      QJM, 2001;94(11):599-607.
      Species: Human
      Sample Type: Plasma
    20. Relationship between airway inflammation and the frequency of exacerbations in patients with smoking related COPD.
      Authors: Gompertz S, Bayley DL, Hill SL, Stockley RA
      Thorax, 2001;56(1):36-41.
      Species: Human
      Sample Type: Saliva
    21. Secretory leukocyte protease inhibitor inhibits infection of monocytes and lymphocytes with human immunodeficiency virus type 1 but does not interfere with transcytosis of cell-associated virus across tight epithelial barriers.
      Authors: Hocini H, Becquart P, Bouhlal H, Adle-Biassette H, Kazatchkine MD, Belec L
      Clin. Diagn. Lab. Immunol., 2000;7(3):515-8.
      Species: Human
      Sample Type: cervicovaginal lavage
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