Cd5 (Ly-1.1) Mouse Monoclonal Antibody [Clone ID: 7-20.6/3]

CAT#: CL005P

Cd5 (Ly-1.1) mouse monoclonal antibody, clone 7-20.6/3, Purified

Product Images

Cell Source: Thymus. Percentage of cells stained above control: 97.9%

• 

Specifications

Product Data

• Clone Name: 7-20.6/3
• Applications: Assay, CT, FC
• Recommended Dilution: Cytotoxicity tests.
  Flow Cytometry.
• Reactivities: Mouse
• Host: Mouse
• Isotype: IgG2a
• Clonality: Monoclonal
• Immunogen: Recipient: 129/ReJ.
  Donor: B6-Ly-1a.
  Fusion Partner: Spleen from immunized recipient fused with myeloma P3-NSI-Ag4-1.
• Specificity: Anti-Ly 1.1 monoclonal antibody reacts with T lymphocytes from mouse strains expressing the Ly 1.1 phenotype, but does not react with lymphocytes from mouse strains expressing the Ly 1.2 phenotype.
  This antibody can be used to identify T helper cells as they have a high density of Ly 1 on their surface.
• Formulation: PBS without preservatives
  State: Purified
  State: Liquid (0.2 µm filtered) purified Ig fraction
• Concentration: 1.0 mg/ml
• Purification: Protein G Chromatography
• Gene Name: Mus musculus CD5 antigen (Cd5)
• Database Link:
  Entrez Gene 12507 Mouse
• Background: CD5 is a 55kDa T lymphocyte single chain transmembrane glycoprotein. It is present on all mature T lymphocytes, on most thymocytes and on many T cell leukemias and lymphomas. It reacts with a subpopulation of activated B cells. CD5/Lyt1 antigen is a monomeric type I transmembrane glycoprotein expressed on thymocytes, T lymphocytes, and a subset of B lymphocytes, but not on natural killer (NK) cells. It has been identified as the major ligand of the B cell antigen CD72. The frequency of CD5+ B cells exhibits strain dependent variation, and the phenotypic, anatomical, functional, developmental, and pathological characteristics of the CD5+ B cells suggest that they may represent a distinct lineage, known as B1 cells. Binding of CD5 on the T cell surface can augment alloantigen or mitogen induced lymphocyte proliferation and induces increased cytosolic free calcium, IL2 secretion, and IL2R expression. It has been proposed that CD5 negatively regulates signal transduction mediated by the T cell and B cell receptors.
• Synonyms: CD5, LEU1
• Note: Protocol: Flow Cytometry Analysis:
  Method:
  1. Prepare a cell suspension in media A. For cell preparations, deplete the red blood cell population with Lympholyte®-M cell separation medium.
  2. Wash 2 times.
  3. Resuspend the cells to a concentration of 2x10e7 cells/ml in media A. Add 50 µl of this suspension to each tube (each tube will then contain 1x106 cells, representing
  1 test).
  4. To each tube, add 0.2-0.5 µg* of CL005P.
  5. Vortex the tubes to ensure thorough mixing of antibody and cells.
  6. Incubate the tubes for 30 minutes at 4°C.
  7. Wash 2 times at 4°C.
  8. Add 100 µl of FITC Goat anti-Mouse IgG (H+L)) secondary antibody at a 1:500 dilution.
  9. Incubate the tubes at 4°C for 30-60 minutes.
  (It is recommended that the tubes are protected from light since most fluorochromes are light sensitive).
  10. Wash 2 times at 4°C in media B.
  11. Resuspend the cell pellet in 50 µl ice cold media B.
  12. Transfer to suitable tubes for flow cytometric analysis containing 15 µl of propidium iodide at 0.5 mg/ml in PBS. This stains dead cells by intercalating in DNA.
  
  Media:
  A. Phosphate buffered saline (pH 7.2) + 5% normal serum of host species + sodium azide (100 μl of 2M sodium azide in 100 mls).
  B. Phosphate buffered saline (pH 7.2) + 0.5% Bovine serum albumin + sodium azide (100 μl of 2M sodium azide in 100 mls).
  
  Results:
  Tissue Distribution by Flow Cytometry Analysis:
  Mouse Strain: C3H/He
  Cell Concentration : 1x10e6 cells per tests
  Antibody Concentration Used: 0.5 μg/106 cells
  Isotypic Control: Purified Mouse IgG2a
  
  Cytotoxicity Analaysis:
  Method:
  1. Prepare a cell suspension from the appropriate tissue in Cytotoxicity Mediuma or equivalent. Remove red cells and dead cells (where necessary)
  by purification of viable lymphocytes on Lympholyte®-M (b) density cell separation medium. After washing, adjust the cell concentration to 1x10e6 cells per ml in Cytotoxicity Medium.
  2. Add the antibody to a final concentration of 1:500 and mix.
  3. Incubate for 60 minutes at 4°C.
  4. Centrifuge to pellet the cells and discard the supernatant.
  5. Resuspend to the original volume in Low-Tox®-M Rabbit Complementc diluted 1:12 in Cytotoxicity Medium.
  6. Incubate for 60 minutes at 37°C.
  7. Place on ice.
  8. Add Trypan Blue, 10% by volume of 1% Trypan Blue (w/v) added 3-5 minutes before scoring works well. Score live versus dead cells in a hemacytometer.
  C.I. = Cytotoxicity Index = 100x
  %Cyt(Ab+Complement) - %Cyt (Complement)/100%-%Cyt (Complement)
  
  Notes:
  a. Cytotoxicity Medium is RPMI-1640 with 25 mM Hepes buffer and 0.3% bovine serum albumin (BSA). BSA is substituted for the conventionally used fetal calf serum (FCS) because we have found that many batches of FCS contain complement dependent cytotoxins to mouse lymphocytes, thus increasing the background killing in the presence of complement. We recommend that cells not be exposed to FCS prior to or during exposure to antibody and complement. Some batches of BSA also contain complement dependent cytotoxins, resulting in the same problem. We screen for batches of BSA giving low background in the presence of complement and use the selected BSA for preparing Cytotoxicity Medium.
  b. Lympholyte®-M cell separation medium is density separation medium designed specifically for the isolation of viable mouse lymphocytes. This separation medium provides a high and non-selective recovery of viable mouse lymphocytes, removing red cells and dead cells. The density of this medium is 1.087 - 1.088. Isolation of mouse lymphocytes on cell separation medium of density 1.077 will result in high and selective loss of lymphocytes and should be avoided.
  c. Rabbit serum provides the most potent source of complement for use with antibodies to mouse cell surface antigens. However, rabbit serum itself is very toxic to mouse lymphocytes. Low-Tox®-M Rabbit Complement is absorbed to remove toxicity to mouse lymphocytes, while maintaining its high complement activity. When used in conjunction with Cytotoxicity Medium, this reagent provides a highly potent source of complement with minimal background toxicity.
  
  Results:
  Antibody Titration by Cytotoxicity Analysis:
  Cell Source: Thymocytes
  Donor: C3H/He
  Cell Concentration: 1.1x10e6 cells/ml
  Complement: Low-Tox®-M Rabbit Complement
  Complement Concentration: 1:15
  C.I. = Cytotoxicity Index = 100x
  %Cyt(Ab+Complement) - %Cyt (Complement)/100%-%Cyt (Complement)
  
  Tissue Distribution by Cytotoxicity Analysis:
  Antibody Concentration: 1:640
  Strain: C3H/He
  
  Cell Source (C.I.)
  Thymus (99)
  Spleen (28)
  Lymph Node (71)
  
  Strain Distribution by Cytotoxicity Analysis:
  Antibody Concentration Used: 1: 500
  Strains Tested: BALB/c, A.TH, CBA/J, C3H/He, C57BL/6
  Positive: CBA/J, C3H/He
  Negative: C57BL/6, BALB/c, A.TH
  
  Functional Analysis:
  Method:
  Cells were treated as described in Cytotoxic Depletion of CD5 (Ly 1.2) Positive
  Lymphocytes. Treated cells and controls were tested for:
  a) the ability to generate plaque-forming cells (PFC) using a modified Jerne haemolytic plaque assay
  b) the ability to generate cytotoxic T effector cells using a cytotoxic lymphocyte reaction (CTL) assay.
  Cells were treated both before and after sensitization in the CTL assay. In vitro immunizations were used in all experiments.
  
  Results:
  Cell Source: Splenocytes
  Donors: C57BL/6 and C3H/He
  Cell Concentration: 1x10e7 cells/ml
  Antibody Concentration used: 1:10
  Complement: Low-Tox®-M Rabbit Complement
  Complement Concentration: 1:10
  Treatment of C3H/He splenocytes with anti-CD5 (Ly 1.1) plus complement was found to reduce the number of plaque-forming cells and inhibit cytotoxic T cell generation. Cytotoxic T effector cell function was not affected (cells treated after sensitization). No effect was observed when C57BL/6 cells were used. These results are consistent with the depletion of T helper cells of the Ly 1.1 phenotype.
  
  Cytotoxic Depleting Of CD5 (Ly 1.1) Positive Lymphocytes:
  1. Prepare a cell suspension from the appropriate tissue in Cytotoxicity Medium (a) or equivalent. Remove red cells and dead cells (where necessary) by purification of viable lymphocytes on Lympholyte®-M cell sepa ration medium. After washing, adjust the cell concentration to 1x10e7 cells per ml in Cytotoxicity Medium.
  2. Add the antibody to a final concentration of 1:500 and mix. Alternatively, pellet the cells and resuspend in antibody diluted 1:500 in Cytotoxicity Medium.
  3. Incubate for 60 minutes at 4°C.
  4. Centrifuge to pellet the cells and discard the supernatant.
  5. Resuspend to the original volume in Low-Tox-M® Rabbit Complementc , diluted to the appropriate concentration in Cytotoxicity Medium. (Recommended concentration included with each batch of Low-Tox-M® Rabbit Complement.)
  6. Incubate for 60 minutes at 37°C.
  7. Monitor for percent cytotoxicity at this stage, before further processing. For this purpose, remove a small sample from each tube, dilute 1:10 with medium, and add 1/10 volume of 1% Trypan Blue. After 3-5 minutes, score live versus dead cells in a hemacytometer.
  8. For functional studies, remove the dead cells from the treated groups before further processing, particularly if the treated cells are to be cultured. This can be done by layering the cell suspension over a separation medium and centrifuging at room temperature as per the instructions provided. Live cells will form a layer at the interface, while the dead cells pellet. The interface can then be collected and washed in Cytotoxicity Medium before being resuspended in the appropriate medium for further processing. Alternatively, the cells can be washed and resuspended in the appropriate medium for further processing immediately after Step #6, provided that the dead cells will not interfere with subsequent assays.