HUMAN CYTOKINE LINCOplex

By Purchasing this product, which contains fluorescently labeled microsphere beads authorized by Luminex Corporation ("Luminex"), you, the customer, acquire the right under Luminex's patent rights, if any, to use this product or any portion of this product, including without limitation the microsphere beads contained herein, only with Luminex's laser based fluorescent analytical test instrumentation marketed under the name of Luminex100.

Intended Use
This is a single plex assay kit manufactured by Linco Research, to be used for the quantitative determination of the IL-10 human cytokine. This kit may be used for the analysis of the above cytokine in serum, plasma, or tissue culture samples.
This kit is for research purposes only.

Reagents Supplied

  1. Antibody-Immobilized Beads
    • 1 bottle containing #23-anti IL-10 in 20X concentration
      Mix beads and dilute with Bead Diluent as described in preparation of reagents for immunoassay.
    Quantity: 0.2 ml antibody-immobilized beads/tube

 

  1. Bead Diluent
    1 vial containing diluent for bead preperation 
    Quantity: 3.5 ml/bottle

     

  2. Human Cytokine Standard Cocktail
    1 vial containing human cytokine standard cocktail, lyophilized. 
    Quantity: 1 vial

     

  3. Human Cytokine Controls
    Control I - 1 vial containing mixed cytokine cocktail, lyophilized
    Control II - 1 vial containing mixed cytokine cocktail, lyophilized
    Quantitiy: 1 vial/Control

     

  4. Serum Matrix, lyophilized (optional - for serum/plasma samples)
    Serum containing 0.08% Sodium Azide 
    Quantity: 1 ml/vial

     

  5. Detection Antibody Cocktail
    1 bottle containing a cocktail of  biotinylated detection antibodies in Assay Buffer
    Quantity: 3.2 ml/bottle

     

  6. Streptavidin-Phycoerythrin
    1 bottle containing Streptavidin-Phycoerythrin prepared in Assay Buffer
    Quantity: 3.2 ml/bottle

     

  7. Assay Buffer
    50 mM PBS with 25 mM EDTA, 0.08% Sodium Azide, 0.05% Tween 20, and 1% BSA, pH 7.4.
    Quantity: 30 ml/vial

     

  8. 10X Wash Buffer
    1:10 dilution required with deionized water to give 10 mM PBS with 0.08% Sodium Azide, and 0.05% Tween 20, pH 7.4
    Quantity: 30 ml/bottle

     

  9. Mixing Bottle
    Quantity: 1 Bottle 

     

  10. Microtiter Filter Plate
    Quantity: 1- 96 Well Filtration Plate

     

  11. Plate Sealers
    Quantity: 2 Plate Sealers

Storage Conditions Upon Receipt

Prior to use, all components in the kit can be stored up to two weeks at 2 - 8°C.

Once the standards and controls have been reconstituted, immediately transfer contents into polypropylene vials. DO NOT STORE RECONSTITUTED STANDARDS OR CONTROLS IN GLASS VIALS. For long-term storage, freeze reconstituted standards and controls at £ -20°C. Avoid multiple (>2) freeze/thaw cycles.

For prolonged storage (>2 weeks) all reagents, except the Antibody-Immobilized Beads, Detection Antibody, and Streptavidin-Phycoerythrin, may be stored frozen at £ -20°C. Store the Antibody-Immobilized Beads, Detection Antibody, and Streptavidin-Phycoerythrin at 2 - 8°C. DO NOT FREEZE Antibody-Immobilized Beads, Detection Antibody, and Streptavidin-Phycoerythrin.

Reagent Precautions

Sodium Azide

    Sodium Azide has been added to some reagents as a preservative. Although the concentrations are low, sodium azide may react with lead and copper plumbing to form highly explosive metal azides. On disposal, flush with a large volume of water to prevent azide build up.

Materials Required but not provided

Reagents

      Luminex Sheath Fluid (Luminex Catalogue #40-50000)

Instrumentation/Materials

    1. Adjustable Pipettes with Tips capable of delivering 25 µl to 1000 µl
    2. Multichannel Pipettes capable of delivering 5 µl to 50 µl or 25 µl to 200 µl
    3. Reagent Reservoirs
    4. Polypropylene Microfuge Tubes
    5. Aluminum Foil
    6. Absorbent Pads
    7. Laboratory Vortex
    8. Sonicator (Branson Ultrasonic Cleaner Model # B200 or equivalent)
    9. Titer Plate Shaker (Lab-Line Instruments, Model #4625, or equivalent)
    10. Vacuum Filtration Unit (Millipore Vacuum Manifold System Catalogue #MAVM0960R, or equivalent)
    11. Luminex100  by Luminex Corporation

Specimen Collection and Storage

  • A maximum of 25 µl per well of serum or plasma can be used.  Tissue culture or other media may also be used.
  • Preparation of Tissue Culture Supernatant:
    Centrifuge the sample to remove debris and assay immediately or aliquot and store samples at £ -20ºC. Avoid multiple (>2) freeze/thaw cycles. Tissue Culture Supernatent may require a dilution with the appropriate medium prior to assay.
  • Preparation of Serum Samples:
    Allow the blood to clot for at least 30 minutes before centrifugation for 10 minutes at 1000 Xg. Remove serum and assay immediately or aliquot and store samples at £ -20ºC. Avoid multiple (>2) freeze/thaw cycles. Use Serum Matrix as the diluent for samples requiring dilution prior to assay.
  • Preparation of Plasma Samples:
    Plasma collection using EDTA as an anticoagulant is recommended. Centrifuge for 10 minutes at 1000 Xg within 30 minutes of blood collection. Remove plasma and assay immediately or aliquot and store samples at £ -20ºC. Avoid multiple (>2) freeze/thaw cycles. It is recommended to centrifuge samples again prior to assay setup. Use Serum Matrix as the diluent for samples requiring dilution prior to assay.
  • All samples must be stored in polypropylene tubes. DO NOT STORE SAMPLES IN GLASS.
  • Avoid using samples with gross hemolysis or lipemia.
  • Care must be taken when using heparin as an anticoagulant, since an excess will provide falsely high values. Use no more than 10 IU heparin per ml of blood collected.

 

Technical Guidelines

  • The Antibody-Immobilized Beads are light sensitive and must be covered with aluminum foil at all times.  Cover the assay plate containing beads with aluminum foil during all incubation steps.
  • It is critical  to allow all reagents to warm to room temperature (20-25°C) before use in the assay.
  • The bottom of the Microtiter Filter Plate should not be in direct contact with any absorbent material during assay set-up or incubation times. The plate can be set on the non-flat side of the plate cover or any other plate holder to raise the plate from the surface.
  • After the wash steps, keep the bottom of the Microtiter Filter Plate clean by blotting on paper towels or absorbent pads to prevent any leakage due to capillary action.
  • Keep the vacuum suction on the plate as low as possible. It is recommended to have a vacuum setting that will remove 200 µl of buffer in >5 seconds (equivalent to < 100 mmHg).
  • After hydration, all standards and controls must be transferred to polypropylene tubes.
  • The standards prepared by serial dilution must be used within 1 hour of preparation. Discard any unused standards except the 10 ng/ml stock standard which may be stored at £ -20°C for 1 month and at £ -80°C for greater than one month.
  • Any unused mixed Antibody-Immobilized Beads may be stored in the bead mix bottle at 2-8°C for up to one month.
  • During the preparation of the standard curve, make certain to vortex the higher concentration well before making the next dilution.Use a fresh tip with each dilution.
  • The plate should be read immediately after the assay is finished.  If, however, the plate cannot be read immediately, seal the plate, cover with aluminum foil, and store at 2-8°C for up to 24 hours. Prior to reading, agitate the plate on the plate shaker at room temperature for 10 minutes.
  • The titer plate shaker should be set at a speed to provide maximum agitation without splashing of liquid outside the wells. For the recommended plate shaker, this would be a setting of 5-7 which is approximately 500-800 rpm.
  • Ensure the needle probe is clean. This may be achieved by sonication and/or Alcohol Flushes. Adjust probe height to the Lincoplex filter plate prior to reading an assay.
  • For cell culture supernatants or tissue extraction, use the culture or extraction medium as matrix in blank, standard curve and controls. If samples are diluted in Assay Buffer, use the Assay Buffer as matrix.

Preparation of Reagents for Immunoassay

  • Preparation of Antibody-Immobilized Beads

    Sonicate the antibody-bead bottle for 30 seconds; vortex for 1 minute. Add 0.15 ml from the antibody bead bottle to the Mixing Bottle and bring final volume to 3.0 ml with Bead Diluent. Vortex well. Unused portions may be stored at 2-8°C for up to one month.
     

  • Preparation of Human Cytokine Standard Cocktail
    1. Before use, reconstitute the Cytokine Standard Cocktail with 250 µl Deionized Water to give a 10,000 pg/ml concentration of standard. Invert the vial several times to mix. Vortex for the vial 10 seconds. Allow the vial to set for 5-10 minutes, then transfer the standard to appropriately labeled polypropylene microfuge tube. This will be used as the 10,000 pg/ml standard; the unused portions may be stored at £ -20° for up to one month.
    2. Preparation of Working Standards

      Label five polypropylene microfuge tubes 2000, 400, 80, 16, and 3.2 pg/ml. Add 200 ml of Assay Buffer to each of the five tubes. Prepare serial dilutions by adding 50 ml of the 10,000 pg/ml reconstituted standard to the 2000 pg/ml tube, mix well and transfer 50 ml of the 2000 standard to the 400 pg/ml tube, mix well and transfer 50 ml of the 400 standard to the 80 pg/ml tube, mix well and transfer 50 ml of the 80 standard to 16 pg/ml tube, mix well and transfer 50 ml of the 16 pg/ml standard to the 3.2 pg/ml tube and mix well. The 0 pg/ml standard (Background) will be Assay Buffer.

      Standard Concentration (pg/ml) Volume of Deionized Water to Add Volume of Standard to Add
      10,000 250 μl 0
      Standard Concentration (pg/ml) Volume of Assay Buffer to Add Volume of Standard to Add
      2000 200 μl 50 μl of 10,000 pg/ml
      400 200 μl 50 μl of 2000 pg/ml
      80 200 μl 50 μl of 400 pg/ml
      16 200 μl 50 μl of 80 pg/ml
      3.2 200 μl 50 μl of 16 pg/ml

 

  • Preparation of Controls
    Before use, reconstitute Cytokine Control I and Cytokine Contol II with 250 ml Deionized Water. Invert the vial several times to mix and vortex. Allow the vial to set for 5-10 minutes and then transfer the controls to an appropriately labeled polypropylene microfuge tube. Unused portions may be stored at £ -20° for up to one month.
  • Preparation of Wash Buffer
    Bring the 10X Wash Buffer to room temperature and mix to bring all salts into solution. Dilute 30 ml of 10X Wash Buffer with 270 ml deionized water. Store unused portions at 2-8°C for up to one month.
  • Preparation of Serum Matrix
    Add 1.0 mL deionized water to the bottle containing lyophilized Serum Matrix. Mix well. Allow at least 10 minutes for complete reconstitution. Left-over reconstituted Serum Matrix should be stored at £ -20° for up to one month.

Immunoassay Procedure

      Prior to beginning this assay, it is imperative to read this protocol completely and to thoroughly understand the Technical Guidelines

Allow all reagents to warm to room temperature (20-25°C) before use in the assay.

  1. Diagram placement of Standards, 0 (Background) 3.2, 16, 80, 400, 2000, and 10,000 pg/ml, Controls I and II, and samples on Well Map Worksheet in a vertical configuration. (Note: the instrument will only read the 96-well plate vertically). It is recommended to run the assay in duplicate.
  2. Block the filter plate by pipetting 200 µL of Assay Buffer into each well of the microtiter plate. Seal and mix on a plate shaker for 10 minutes at room temperature (20-25°C).
  3. Remove Assay Buffer by vacuum. (NOTE: DO NOT INVERT PLATE). Remove any excess Assay Buffer from the bottom of the plate by blotting on an absorbent pad or paper towels.
  4. Add 25 µL of Assay Buffer to the 0 Standard (Background).
  5. Add 25 µL of Assay Buffer to the Sample well.
  6. Add 25 µL of each Standard or Control into the appropriate wells.
  7. Add 25 µL of appropriate matrix diluent to the Background, Standards, and Control wells. When assaying serum or plasma, use Serum Matrix.  When assaying Tissue Culture or other supernatent, use similiar medium as the diluent.
  8. Add 25 µL of Sample into the appropriate wells.
  9. Votex Bead Bottle and add 25 µL of Mixed Beads to each well. (Note: during addition of Mixed Beads, shake bead mix intermittently to avoid settling)
  10. Seal, cover with aluminum foil, and incubate with agitation on a plate shaker for 1 hour at room temperature.
  11. Gently remove fluid by vacuum. (NOTE: DO NOT INVERT PLATE)
  12. Wash plate 2 times with 200 µL/well of Wash Buffer, removing Wash Buffer by vacuum filtration between each wash. Remove any excess Wash Buffer from the bottom the plate by blotting on an absorbent pad or paper towels. 
  13. Add 25 µL of Detection Antibody Cocktail into each well. (Note: allow the Detection Antibody to warm to room temperature prior to addition.)
  14. Seal, cover with aluminum foil, and incubate with agitation on a plate shaker for 30 minutes at room temperature (20-25°C). DO NOT VACUUM AFTER INCUBATION.
  15. Add 50 µL Streptavidin-Phycoerythrin to each well containing 50 µL of Detection Antibody Cocktail.
  16. Seal, cover with aluminum foil, and incubate with agitation on a plate shaker for 30 minutes at room temperature (20-25°C).
  17. Gently remove all contents by vacuum. ash plate 2 times with 200 µL/well Wash Buffer, removing Wash Buffer by vacuum filtration between each wash. Wipe any excess buffer on the bottom of the plate with a tissue. (NOTE: DO NOT INVERT PLATE)
  18. Add 100 µL of Sheath Fluid to all wells. Cover with aluminum foil and resuspend the beads on a plate shaker for 5 minutes.
  19. Run plate on Luminex100.
  20. Save and evaluate the median data using a 5-parameter or spline fit data reduction.

Equipment Settings

Select the following equipment settings

Events: 50
Sample Size: 50 µl
Bead Set: 023 for IL-10
Gate (for IS System): 8,000 to 15,000
Gate (for 1.7 System): 8,060 to 13,000


These specifications are for the Luminex100v.1.7 or Luminex100IS v2.1/2.2. Luminex instruments with other software (e.g. Masterplex, Starstation, LiquiChip, Bioplex, LABScan100) would need to follow instrument instructions for gate settings and additional specifications

Assay Characteristics

Standard Comparison  
The following LINCOplex standards with known values of mass and standards received from the National Institute of Biological Standards and Controls with assigned Bioassay units and approximate mass determinations were assayed together to provide the following conversion factor

Cytokine NCI Lot # 1 LINCOplex pg/ml=
IL-10 92/516 3.8 mIU/ml

Precision

Cytokine Intra-assay
Precision (%CV)		 Interassay
Precision (%CV)
IL-10 5.5 11.2

Intra-assay precision is generated from the mean of the %CV's from 5 reportable results across three different concentration of cytokines in a single assay. Interassay precision is generated from the mean of the %CV's from 5 reportable results across three different concentrations of cytokine across six different assays.

Accuracy

Cytokine % Recovery Standard Deviation
IL-10 113 12.5

Accuracy, defined as Percent Recovery, is generated from calculating the %Recovery of three different levels of cytokine spiked into 6 different human serum samples with known low or no measurable cytokine levels.

Replacement Reagents

Reagents Cat. #
Cytokine Standard Cocktail L-8060
Cytokine Control L-6060
Serum Matrix LHC-SD22 (optional)
IL-10 Detection Antibody Cocktail L-1060-IL10
Streptavidin-Phycoerythrin L-SAPE2
Assay Buffer (20 ml/vial) L-AB
Set of two 96-Well Filter Plates with sealers L-PLATE
10X Wash Buffer L-WB
Bead Diluent LBD
23-anti-IL-10 Beads HIL-10