1 Test per tube
Product Catalog No: 2523900
ReaPan 34845 Reagent
Manufactured by
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ReaPan 34845 Reagent INTENDED USE The ReaPan 34845 reagent is a four color immunofluorescence stain for the labeling and identification of helper/inducer (CD4+) cytotoxic/suppressor (CD8+) cells and total Tlymphocytes (CD3+) combined with a precise number of fluorescent counting beads for absolute and percentages of CD4+, CD8+ and CD3+ TCells and absolute lymphocyte counts. This reagent is intended to be used in a “lyseno wash” protocol for flow cytometry analysis of erythrocytelysed human whole blood. SUMMARY AND EXPLANATION The ReaPan 34845 reagent contains fluorescently labeled antibodies that bind to CD45, CD3, CD4 and CD8 antigens found on the surface of circulating leukocytes. The CD3 antigen is a complex of at least six proteins known collectively as
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the Tcell receptor (TCR) complex. The antibody used in this reagent binds to the 20kDa ε chain of this complex (1).
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The CD4 antigen is a 59kDa protein. It interacts with class II molecules of the major histocompatibility complex and is the primary receptor for the Human Immunodeficiency Virus (HIV) (2, 3). The CD8 antigen is a complex consisting of two disulfide linked subunits. The antibody used in this reagent binds to the 32kDa α subunit of the complex. CD8 interacts with class I major histocompatibility complex molecules (2,3). The CD45 antigen is a complex 180220kDa transmembrane glycoprotein which is expressed in high levels on leukocyte cell surfaces and its presence distinguishes leukocytes from nonhaematopoietic cells (1). Clinical Relevance Cells that are both CD3+ and CD4+ are identified as helper/inducer lymphocytes. Decreased CD4+CD3+ Tcell counts have been associated with some forms of immunodeficiency (such as HIV). Suppressor/cytotoxic lymphocytes are the subset of cells that have both CD3 and CD8 receptors (57). Increased CD8+CD3+ Tcell counts have been observed in some
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cases of immunodeficiency (8) PRINCIPLE OF THE PROCEDURE The ReaPan 34845 reagent consists of murine monoclonal antibodies that specifically recognize the human leukocyte surface antigens CD3, CD4, CD8 and CD45. Each of the monoclonal antibodies is labeled with a unique fluorochrome. Specific cell subsets are stained when blood is combined with the reagent and each monoclonal antibody binds to the binds to the cell determinant molecules on the cell surface. Specific cell subsets are identified when passed through a flow cytometer laser beam. The ReaPan 34845 reagent also contains a precise number of fluorescent beads. When the reagent is combined with a known volume of blood the reagent provides for the single platform determination of the absolute cell concentrations of the stained subsets. The volume of sample analyzed can be determined by multiplication of the total sample volume by the fraction of total beads that were detected during the analysis. REAGENT
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The ReaPan 34845 reagent is formulated in buffered saline with sodium azide and stabilizer. It contains Allophycocyanin (APC)– labeled antiCD4 monoclonal antibody, clone RPAT4; RPhycoerythrin(PE)– labeled anti CD8 monoclonal antibody, clone LT8; Atto™488– labeled antiCD3 monoclonal antibody, clone UCHT1; and Peridininchlorophyllprotein Complex (PerCP)– labeled antiCD45 monoclonal antibody, clone HI30.The monoclonal antibodies used in the ReaPan 34845 were assigned these specificities at the 8th International Workshop on Human Leukocyte Differentiation Antigens (9). A precise number of fluorescent counting beads are included in the ReaPan 34845 reagent to allow singleplatform determination of absolute CD4+, CD8+, CD3+ Tcell and absolute lymphocyte counts. The ReaPan 34845 reagent is provided in dried form and dispensed in flow cytometer compatible sample tubes with each tube containing one readytouse test. Fifty (50) tests are supplied in each ReaPan 34845 reagent package. Precautions
1. Warning: The ReaPan 34845 reagent contains Sodium azide.
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2.
3.
Sodium azide is harmful if swallowed (R22). Wear suitable protective clothing (S36). If swallowed, seek medical advice immediately (S46). Contact with acids liberates toxic gas (R32). Azides should be flushed with large amounts of water during disposal to avoid deposits in lead or copper plumbing. Warning: All blood specimens are considered biohazards. Handle them as if they are capable of transmitting infection and dispose off with proper precautions and accordance with governmental regulations. The addition of the precise volume of blood is critical to obtain correct results. Use a calibrated pipette and operate according to the manufacturer’s instructions.
Storage and Handling 1. 2. 3.
Store the reagent at room temperature in a dry place. Do not use the reagent after the expiry date mentioned on the label. Do not freeze or refrigerate the ReaPan 34845 reagent. The ReaPan 34845 reagent is light sensitive. Do not expose to direct light either during storage or when mixed with blood.
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4.
Use the zip lock to reseal the reagent pouch after you have removed the desired number of tests. Do not use the tubes beyond the expiration date indicated on the packaging.
Indication of Instability The ReaPan 34845 reagent is a dry glassy coating at the bottom of the reaction tube. Do not use if the reagents appears to be moist or it has become dislodged from the bottom of the reaction tube. INSTRUMENT The ReaPan 34845 reagent is designed for use on a flow cytometer equipped with appropriate computer hardware and software. ReaMetrix recommends the BD FACSCalibur™ or Accuri™ flow cytometer; however, results can be achieved using other platforms. The flow cytometer must be equipped with 488 nm and 635 nm lasers and must be capable of detecting light scatter (forward and side) and fourcolor fluorescence with emission detectable in four ranges: 515–545 nm, 562–607 nm, >650 nm, and 652– 668 nm. It must be able to threshold or discriminate using the >650 nm
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channel. Instrument should be calibrated by setting photomultiplier tube voltages, fluorescence compensation, and checking instrument sensitivity before use according to the manufacturer’s guidelines. The user is responsible to optimize the performance of the reagent for use in flow cytometers other than that mentioned above. For other flow cytometers, set up the cytometer for fourcolor acquisition following the manufacturer’s recommendations. Setup should include setting or checking PMT voltages, fluorescence compensation, and instrument sensitivity. SPECIMEN COLLECTION The blood sample should be collected in a sterile blood collection tube containing K3EDTA. Follow the collection tube manufacturer’s guidelines for the minimum volume of blood to be collected. The anticoagulated blood must be stored at room temperature (20°C 25°C) and should be stained and analyzed within 24 hours of draw. Interfering conditions
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Refrigerated or previously fixed blood specimens can yield erroneous results and should be rejected. Hemolyzed, aged, or partially clotted blood specimens can affect flow cytometer performance. PROCEDURE Reagent Provided ReaPan 34845 reagent in a dried format Reagents and materials required but not provided 1. Blood collection tube containing K3EDTA 2. Calibrated pipettes 3. Vortex mixer 4. Lysing SolutionA or similar blood fix/lyse solution 5. Sheath fluidB 6. 0.2µm filtered, deionized distilled water or MilliQ waterC 7. Flow cytometer Calibration BeadsD
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A. B.
ReaLyse Lysing solution: ReaMetrix Catalog No: 2523700
C.
Accuri Flow cytometer uses MilliQ water/Distilled deionized water instead of Sheath fluid
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Calibration Beads: BD Catalog No. 340486
Sheath fluid: BD Catalog No.342003
Assay Protocol 1.
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3. 4.
Mix blood sample (invert blood tube at least 10 times) and reverse pipette 50µL of blood into the correctly labeled tube that contains the dry down reagent. Gently vortex each tube for 30 seconds. Incubate for 30 minutes at room temperature. Protect the tube from direct light. Add 450µL of 1X ReaLyse lysing solution to each tube and vortex for 10 seconds. Return tubes to the dark for at least 15 minutes. Vortex sample tube thoroughly (at low speed) and load onto cytometer for analysis.
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Quality Control Commercially available quality control whole blood control cells can be run each day. Established values can be used to assess reagent and system performance. FLOW CYTOMETER ACQUISITION AND ANALYSIS Start flow cytometer according to manufacturer’s instructions (In the case of FACSCalibur™, the instrument should be setup and calibrated using CaliBRITE™ beads and FACSComp™ software; For Accuri™ flow cytometer instruments, the performance of the instrument should be checked by Validation beads provided by Accuri.) For BD FACSCalibur™ Flow Cytometer Instruments 1. Draw five dotplot views – Refer Figure 1
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View 1: AntiCD45 PerCP (FL3) versus side scatter (SSC– Linear scale)
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View 2: AntiCD3 Atto488 fluorescence (FL1) versus side scatter (SSC– Linear scale) of events gated as CD45+ (R1) from the View 1.
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View 3: CD4 APC (FL4) versus CD3 Atto 488 (FL1) of events gated as CD45+ (R1) from the View 1.
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View 4: CD8 PE (FL2) versus CD3 Atto 488 (FL1) of events gated as CD45+ (R1) from the View 1.
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View 5: AntiCD8 PE (FL2) versus AntiCD3 Atto488 (FL1). View5 will have a gate (R3) to capture the fluorescent reference beads. The beads have a high FL1 and FL2 Mean Fluorescence Intensity 2. Before acquisition adjust the FL3 threshold to minimize debris. 3. Set the number of events to capture at 3000 for R3 gate (View 5) and start data acquisition. When 3000 beads are acquired in the gate R3, acquisition stops. 4. Gate the brightest CD45+ cell cluster in View1 and gate the population as R1. This CD45+ cell cluster is that population which has the lower SSC intensity and higher FL3 mean
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fluorescence intensity. It represents the lymphocyte population. The Gate R1 is applied on View 2, 3 & 4. 5. Total CD3+ events can be identified in View 2 in R2. 6. The CD4+ and CD8+ cell populations can be identified in View 3 and View 4 in the upper right quadrants. 7. The absolute count for each cell type can be calculated using the following equation, (Gated Cell Count) x(Bead Absolute CellCount / µL = (Gated Bead Count) x(Test
Count per te Volumein µL
Where the Gated Cell count and Bead count are obtained from the Flow Cytometer analysis, and the Bead count per test from the test kit provided. Example: If the bead count per ReaPan 34845 test is 50,000, the volume of blood tested is 50µl, the number of gated beads is 3,000 (Figure 1, View 5, R3 gated events), and the number of gated CD4+ Tcells is 1,500 (Figure 1, View 3, UR quadrant) then the absolute CD4+ Tcell count is 500 cell/µl.
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Absolute CD4 CellCount=
View 1
1500 x 50000 = 500cells / µL 3000 x 50
View 2 View 5
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View 3
View 4
Figure 1. Dot plot views: View 1: CD45 PerCP fluorescence (FL3 log scale) versus side scatter (SSC – Linear scale) View 2: CD3 Atto488 fluorescence (FL1 log scale) versus side scatter (SSC– Linear scale) View 3: CD4 APC fluorescence (FL4– log scale) versus CD3 Atto 488 (FL1– log scale) of events gated as CD45+ from View 1 View 4: CD8 PE fluorescence (FL2 log scale) versus CD3 Atto488 (FL1 log scale) of events gated as CD45+ from View 1. View 5: CD8 PE fluorescence (FL2 log scale) versus CD3 Atto488 (FL1 log scale). R3 captures the fluorescent reference beads
For Accuri™ Flow Cytometer Instruments
1. Draw five dotplot views – Refer Figure 2. • View 1: CD45 PerCP (FL3Log scale) versus side scatter (SSC – Linear scale)
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View 2: CD3 Atto488 fluorescence (FL1Log scale) versus side scatter (SSC – Linear scale) of events gated as CD45+ (P1) from the View 1.
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View 3: CD4 APC (FL4 Log scale) versus CD3 Atto 488 (FL1 Log scale) of events gated as CD45+ (P1) from the View 1.
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View 4: CD8 PE (FL2 Log scale) versus CD3 Atto 488 (FL1 Log scale) of events gated as CD45+ (P1) from the View 1.
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View 5: CD8 PE (FL2 Log scale) versus CD3 Atto488 (FL1 Log scale) of all events from View 1. View5 will have a gate (P2) to capture the fluorescent reference ReaCount beads.
Following table (Table1) represents the Plot Specification Value to set the scales: Table1: Dot Plot View X & YAxis Scale Specifications Dot Plot Views View 1
Axis XAxis
Scale FL3Log scale
Min Value 500
Max value 200,000
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View 2 View 3 View 4 View 5
YAxis XAxis YAxis XAxis YAxis XAxis YAxis XAxis YAxis
SSCLinear scale FL1Log scale SSCLinear scale FL4Log scale FL1Log scale FL1Log scale FL2Log scale FL1Log scale FL2Log scale
0 500 0 50 200 50 500 50 500
175,000 500,000 120,000 1,000,000 1,000,000 500,000 500,000 500,000 500,000
2. In the Run Limit section of the Instrument template panel, set the
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instrument Threshold on FL3 and set the value to 1000. Before/After acquisition adjust the FL3 Threshold value to minimize debris. Click on the Set Colour Compensation to open the compensation matrix and set the compensation values as per Figure 3. In the Run Limit section of the Instrument template panel, set the fluidics Flow rate on MEDIUM. Set the number of events to capture at 3000 for P2 gate bead events (Figure 2; View 5)
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5. Vortex sample tube thoroughly at low speed and load onto flow 6.
7. 8. 9. 10.
cytometer for acquisition. When 3000 bead events are acquired in the gate P2, acquisition stops. Gate the brightest CD45+ cell cluster in View1 and adjust the P1 gate around the lymphocyte population. This CD45+ cell cluster is that population which has the lower SSC intensity and higher FL3 mean fluorescence intensity. It represents the lymphocyte population. The Gate P1 is applied on View 2, 3 and 4. CD3+ cell clusters are separated using gate R1 (View2, Figure 2). The CD3+ cell population has the lower SSC intensity and higher FL1 mean fluorescence intensity. In View3 (Figure 2) cell clusters are separated using quadrant gate Q1. The CD4+CD3+ cell populations can be identified in View3 (Figure 2) in the upper right quadrant Q1UR as double positives. In View4 (Figure 2) cell clusters are separated using quadrant gate Q1. The CD8+CD3+ cell populations can be identified in View4 (Figure 2) in the upper right quadrant Q1UR as double positives View5 (Figure 2); fluorescent reference beads are separated using gate P2. The beads have a high FL1 and FL2 Mean Fluorescence
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Intensity.
11. The absolute count for each cell type can be calculated using the following equation.
(Gated Cell Count) x(Bead Absolute CellCount / µL = (Gated Bead Count) x(Test
Count per test) Volumein µL)
Where the Gated Cell count and Bead count are obtained from the Flow Cytometer analysis and the Bead count per test from the test kit provided. Example: If the bead count per ReaPan 34845 test is 50,000, the volume of blood tested is 50µl, the number of gated beads is 3,000 (Figure 2, View 5, P2 gated events), and the number of gated CD4+ Tcells is 1,500 (Figure 2, View 3, Q1UR quadrant) then the absolute CD4+ Tcell count is 500 cell/µl.
Absolute CD4 CellCount= View 1
1500 x 50000 = 500cells / µL 3000 x 50 View 2
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View 5
View 3
View 4
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Figure 2. Dot plot views: View 1: CD45 PerCP fluorescence (FL3 log scale) versus side scatter (SSC – Linear scale); View 2: CD3 Atto488 fluorescence (FL1 log scale) versus side scatter (SSC– Linear scale) of events gated as CD45+ (P1) from the View 1; View 3: CD4 APC fluorescence (FL4– log scale) versus CD3 Atto 488 (FL1– log scale) of events gated as CD45+ (P1) from the View 1; View 4: CD8 PE fluorescence (FL2 log scale) versus CD3 Atto488 (FL1 log scale) of events gated as CD45+ (P1) from the View 1; View 5: CD8 PE fluorescence (FL2 log scale) versus CD3 Atto488 (FL1 log scale). R3 captures the fluorescent reference beads
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Figure 3: Accuri Flow cytometer Compensation settings for ReaPan 34845 Reagent
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PERFORMANCE CHARACTERISTICS The performance data for ReaPan 34845 reagent was generated by undertaking clinical validation. Accuracy The absolute counts for CD4+, CD8+ and CD3+ TCells determined using ReaPan 34845 reagent were compared with DryTri TSTAT CD3/CD4/CD8 reagents (Figure 4, Figure 5 and Figure 6 ) using a BD FACSCalibur™ flow cytometer. The absolute counts for CD45+ (Absolute Lymphocyte Count – ALC) determined by the ReaPan 34845 were compared with a hematology counter (Figure 7).
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Figure4: Correlation of absolute CD4+ TCell counts determined using ReaPan
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34845 compared to a commercially available reagent Dry Tri TSTAT CD3/CD4/CD8
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Figure 5: Correlation of absolute CD8+ TCell counts determined using the ReaPan 34845 compared to a commercially available reagent Dry Tri TSTAT CD3/ CD4/CD8
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Figure 6: Correlation of absolute CD3+ TCell counts (Total TCells) determined using the ReaPan 34845 compared to a commercially available reagent Dry Tri T STAT CD3/CD4/CD8
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Figure 7: Correlation of CD45+ cell counts (ALC) determined using the ReaPan 34845 compared to the lymphocyte count obtained from a Hematology analyzer
Specificity The antigen specificities for the CD3, CD4, CD8 and CD45 monoclonal antibodies used in the ReaPan 34845 reagent were confirmed by the Human Leukocyte Differentiation Antigens (HLDA) Workshops. After conjugation of the antibodies no additional crossreactivity was observed. LIMITATIONS
1. The ReaPan 34845 reagent has only been validated with K3EDTA treated whole blood. 2. Laboratories should establish their own reference ranges for the absolute counts obtained using the ReaPan 34845 reagent. BIBLIOGRAPHY
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1. Knapp W, Dorken B, Gilks WR, Rieber EP, Schmidt RE, Stein H, &
von dem BorneAEGKr, eds. Leukocyte typing IV. White cell differentiation antigens. Oxford university press 1989 2. Reinherz EL, Meuer SC, and Schlossman SF. The delineation of antigen receptors on human T lymphocytes. Immunology Today, 1983, 4:58. 3. Fauci AS: The human deficiency virus: Infectivity and mechanism of pathogenesis. Science, 1988, 239:617622. 4. Reinherz EL and Schlossman SF. The differentiation and function of human T lymphocytes. Cell, 1980, 19:821827. 5. Phillips A, Lee C, Elford J, et al. Serial CD4 lymphocyte counts and the development of AIDS. Lancet 1991, 337:389392. 6. Nicholson J. Use of flow cytometry in the evaluation and diagnosis of primary and secondary immunodeficiency diseases. Arch. Pathol. Lab. Med. 1989, 113:598605 7. Yarchoan R, Venzon D, Pluda J, et al. CD4 count and the risk of death in patients infected with HIV receiving antiretroviral therapy. 1991, 115:184189.
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8. Giorgi J & Detels R. Tcell subset alterations in HIVinfected homosexual men: NIAID multicenter AIDS cohort study. 1989, 52:1018. 9. Heddy Z, Swart B, Nicholson I, & Voss E, eds. Leukocyte and stromal cell molecules; the CD markers. John Wiley & Sons 2007.
WARRANTY This product is warranted only to conform to the quantity and contents stated on the label at the time of delivery to the customer. There are no warranties, expressed or implied, that extend beyond the description on the label of the product. ReaMetrix’s sole liability is limited to replacement of the product. ReaMetrix is not liable for property damage, personal injury, or economic loss caused by the product. Note: FACSCalibur, CaliBRITE, FACSComp are all registered trade names of BectonDickinson; Accuri C6 flow cytometer is the trade name of Accuri.
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Manufactured by ReaMetrix India Pvt. Ltd. Manufacturing License Number: KTK/25/519/2006 50B, II Phase, Peenya Industrial Area Peenya, Bangalore 560058, India Ph: +918028378693/5, Fax: +918041172451 Email:
[email protected], www.reametrix.com Rev No. 3.0, 22Sep09
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