pi 25237 00 realyse lysing solution
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ReaLyse Lysing Solution10X Concentrate
Catalog No. 25237 00
1. INTENDED USE
The ReaLyse solution is an erythrolytic reagent intended for lysing red blood cells to enable a lyseno wash protocol in applications that involve immunofluorescent staining of human peripheral blood leucocytes.
The ReaLyse solution is recommended for use in lysis and fixation of cell preparations stained with ReaMetrix reagents such as Dry Tri TSTAT CD3/CD4/CD8 and CD3/CD4/CD45, ReaPan 34845, ReaPan B27, and ReaPan S34 which are to be analyzed by flow cytometry.
2. BACKGROUND
The quality of immunophenotypic analysis of cell preparations is evaluated on the basis of a high signal to noise ratio. The noise quotient of a cell preparation is predominantly caused by the large percentage of red blood cells (erythrocytes) relative to the fraction of white blood cells (leucocytes) in the same. The removal of erythrocytes by lysis greatly reduces the background noise, thus allowing for easier analysis of the target cell populations which have been stained by fluorophore tagged antibodies.
Use of ReaLyse solution in the processing steps for analysis of the sample preparations to be analyzed using the abovementioned reagents (Section 1) is highly recommended. This ensures the sufficient lysis of Red Blood Cells (RBCs) and fixing of the immuno stained population thus allowing for samples to be analyzed in a lysenowash protocol.
3. PRINCIPLE OF LYSIS
When whole blood is added to the monoclonal antibody reagent, the fluorochromelabeled antibodies in the reagent bind specifically to leucocyte surface antigens. The stained samples are then treated with ReaLyse lysing solution which results in simultaneous lysis of red blood cells under gentle hypotonic conditions and fixation of the leucocytes resulting in a leucocyte suspension substantially free of red blood cells and suitable for flow cytometric analysis.
4. REAGENT
The ReaLyse lysing solution is formulated as a buffered solution and contains Formaldehyde and Diethylene glycol.
It is provided as a 10X concentrate. A working solution of 1X dilution of this concentrate is to be used for the lysis of cell preparations before analysis by flow cytometry. To obtain the working solution, the dilution of the 10X concentrate is performed in deionized water at room temperature (20°C to 25°C) using reference table1.
Precautions1. The ReaLyse lysing solution contains Diethylene glycol and Formaldehyde.
Formaldehyde is a potential carcinogen and causes irritation to the eyes and skin. Ingestion of Diethylene glycol can be fatal. Wear suitable protective clothing. If swallowed, seek medical attention immediately.
2. All blood specimens are considered biohazards. Handle them as if they are capable of transmitting infection and dispose off with proper precautions in accordance with governmental regulations.
3. The addition of the precise volume of deionized water is critical to obtain correct concentration of the 1X working solution. Use a calibrated pipette and operate according to the manufacturer’s instructions.
4. The use of temperatures, incubation and vortexing times other than those specified in the corresponding product inserts may give erroneous results.
Dilution Instructions
Dilute the 10X concentrate 1:10 with the deionized water at room temperature (20° to 25°C) to prepare 1X working lysing solution according to Table 1. Mix well.
Table 1: Dilution Instructions for Preparation of 1X ReaLyse Lysing (Working)
solution
Required Volume of 1X Working solution (mL) 5 10 15 20 25Volume of 10X Concentrate (mL) 0.5 1.0 1.5 2.0 2.5Volume of Deionized Water (mL) 4.5 9.0 13.5 18.0 22.5
Storage and Handling
Store the reagent at room temperature in a dry place. Do not use the reagent after the expiry date on the label.
Do not freeze the ReaLyse Lysing solution. Follow the instructions given on the container label to ensure good shelf life.
The diluted working solution is stable for one month when stored in a glass container at room temperature. Do not use this reagent if discoloration occurs or a precipitate forms.
The ReaLyse lysing solution contains Formaldehyde which is highly volatile. Do not leave the lid in a loose or open position. The lid should be tightly sealed after use.
Note Follow appropriate instructions as given in the respective product inserts for information on instruments, sample collection and sample processing.
5. PERFORMANCE CHARACTERISTICS
Representative Acquisition Plots of ReaLyse Lysing Solution with ReaMetrix Reagents
Depicted below are acquisition plots of peripheral blood samples incubated with DryTri TSTAT CD3/CD4/CD45 reagent (Figure 1) and DryTri TSTAT CD3/CD4/CD8 reagent (Figure 2); processed with ReaLyse lysing solution and analyzed on a FACScan flow cytometer.
Figure 1. SSC vs. CD45 dot plot; CD3 vs. CD4 dot plot obtained with DryTri TSTAT CD3/CD4/CD45 reagent.
Figure 2. SSC vs. CD3 dot plot; CD8 vs. CD4 dot plot obtained with DryTri TSTAT CD3/CD4/CD8 reagent/
The dualparameter light scatter plots (SSC versus FSC, Figure 3) illustrates the expected leucocyte spatial distribution of a normal K3EDTA anticoagulated blood sample lysed with ReaLyse lysing solution using lyse no wash procedure. Acquisition and analysis are with a BD FACScan flow cytometer equipped with Cell Quest Pro software.
Figure 3. SSC vs. FSC dot plot
The following plots depict peripheral blood sample immuno stained with ReaPan 34845 reagent and treated with ReaLyse lysing solution prior to analysis on a FACS Calibur flow cytometer (Figure 4).
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Figure 4. SSC vs. CD45 dot plot; SSC vs. CD3 dot plot; CD3 vs. CD4 dot plot;
CD3 vs. CD8 dot plot obtained with ReaPan 34845 reagent
Performance Data
The following performance data for lysing solution were generated by performing clinical validation on DryTri TSTAT CD3/CD4/CD45 reagent.
AccuracyThe absolute counts for CD45+, CD3+ and CD4+CD3+ Tcells were
determined using DryTri TSTAT CD3/CD4/CD45 reagent. Aliquots of the same blood samples were stained and lysed with the ReaLyse lysis solution and a commercially available lysis solution. The samples were analyzed using a BD FACScan™ flow cytometer. The plots in the figure 5, 6, 7, 8 indicate that the results from both the lysis solutions are equivalent.
Figure 5. Correlation of Absolute Lymphocyte Counts (CD45+) determined using the DryTri TSTAT CD3/CD4/CD45 reagent lysed with ReaLyse lysis solution compared to a commercially available lysis solution. (n=30)
Figure 6. Correlation of Absolute Lymphocyte Counts (CD45+) determined using the DryTri TSTAT CD3/CD4/CD45 reagent lysed with ReaLyse lysis solution compared to Absolute Lymphocyte Counts determined using Hematology Analyzer. (n=26)
Figure 7. Correlation of Absolute CD3+ cell Counts determined using the DryTri TSTAT CD3/CD4/CD45 reagent stained and lysed with ReaLyse lysing solution compared to a commercially available lysing solution. (n=30)
Figure 8. Correlation of Absolute CD4+ CD3+ cell Counts determined using the DryTri TSTAT CD3/CD4/CD45 reagent stained and lysed with ReaLyse lysing solution compared to a commercially available lysing solution. (n=30)
PrecisionThe blood of 3 healthy donors was stained five times each with DryTri
TSTAT CD3/CD4/CD45 reagent. The lyse nowash staining and lysis procedure was used and run on FACScan flow cytometer. The observed CV was <5%. The results obtained are summarized in the following table.
6. LIMITATIONS
1. ReaLyse lysing solution is specifically formulated for use with ReaMetrix reagents.
2. Retain samples in VACUTAINER blood collection tubes at room temperature (20° to 25°C) prior to staining and lysing. Refer to the reagent package insert for maximum storage times after collection.
3. Samples with nucleated red blood cells may show incomplete lysis of red blood cells. This may also occur when assaying blood samples from patients with certain hematologic disorders in which red cells are difficult to lyse, as in sicklecell anaemia, thalassemia, spherocytosis, etc.
4. Reagents should be used before the expiration date printed on the reagent bottle.
5. Results obtained with flow cytometry may be erroneous if the instrument is misaligned, compensation spillovers are not correctly compensated or the gate is improperly set.
6. Reproducible results will be obtained as long as the procedure used is in accordance with this package insert and with good laboratory practice guidelines.
7. REFERENCES
1. Mandy FF, Nicholson JK, McDougal JS. Guidelines for performing singleplatform absolute CD4+ Tcell determinations with CD45 gating for persons infected with human immunodeficiency virus. Centre for Disease Control and Prevention. MMWR Recomm Rep 2003 Jan 31;52(RR2):113.
2. Mandy FF, Brando B. Enumeration of Absolute Cell Counts Using Immunophenotypic Techniques. Current Protocols in Cytometry (2000) 6.8.16.8.26.
3. Bossuyt X, Marti GE, Fleisher TA: Comparative analysis of whole blood lysis methods for flow cytometry. Cytometry 30:124–133, 1997.
4. Tamul KR, Schmitz KK, Folds JD: Comparison of the effects of FicollHypaque separation and whole blood lysis on results of immuno phenotypic analysis of blood and bone marrow samples from patients with hematologic malignancies. Clin Diagn Lab Immunol 2:337–342, 1995.
5. Carter PH, RestoRuiz S, Washington GC, Ethridge S, Paline A, Vogt R, Waxdal M, Fleisher T, Noguchi PD, Marti GE: Flow cytometric analysis of whole blood lysis, three anticoagulants, and five cell preparations. Cytometry 13:66–74, 1992.
6. Vuorte, J., Jansson, SE., Repo, H., "Evaluation of red blood cell lysing solutions in the study of neutrophil oxidative burst by the DCFH assay", 2001, Cytometry, 43, 290296.
7. Tiirikainen MI. Evaluation of red blood cell lysing solutions for the detection of intracellular antigens by flow cytometry. Cytometry 1995;20:341–348.
8. WARRANTY
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The 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’ sole liability is limited to replacement of the products. ReaMetrix is not liable for property damage, personal injury, or economic loss caused by the product.
Note: FACScan, FACSCalibur are all registered trade names of BectonDickinson; EPICS XL is registered trade name of BeckmanCoulter.
CUSTOMER SUPPORT INFORMATION
ReaMetrix India Pvt. Ltd.50B, II Phase, Peenya Industrial AreaPeenya, Bangalore560058, IndiaPh: 918028378693/5,Fax: 918041172451Email: [email protected]
Rev No. 2.0, 15Apr09