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Murine in vitro Memory T Cell Differentiation   

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Abstract

Upon pathogen encounter, naïve CD8+ T cells are primed and undergo massive clonal expansion. A fraction of effector CD8+ T cells remains during the contraction phase and differentiate into memory T cells critical for mounting robust recall responses in response to secondary infection. Low frequency of memory T cells in vivo is a major obstacle to investigate their functional aspects including migration capacity and genetic regulation. Here, we describe detailed protocol for memory T cell differentiation developed by von Andrian’s group to generate large number of CD44hiCD62Lhi antigen-specific memory T cells in vitro.

Keywords: Ag-specific memory CD8 T cell, OT-I, IL-15, In vitro, CD44+CD62L+ central memory T cell

Materials and Reagents

  1. Recombinant mouse IL-15 (rmIL15) (BioLegend, catalog number: 566302 )
  2. RPMI-1640 medium (Life Technologies, Gibco®, catalog number: 11875-119 )
  3. Fetal bovine serum (Atlanta Biologicals, catalog number: S11055H )
  4. Penicillin/streptomycin (Gemini Bio-Products, catalog number: F52M00E )
  5. L-Glutamine (Life Technologies, Gibco®, catalog number: 25030-081 )
  6. 100x 1 M Hepes (Life Technologies, Gibco®, catalog number: 15630-080 )
  7. 100x MEM non-essential amino acids (Life Technologies, Gibco®, catalog number: 11140-050 )
  8. 100x sodium pyruvate (100 mM) (Life Technologies, Gibco®, catalog number: 11360-070 )
  9. 100x 2-mercaptoethanol (Life Technologies, Gibco®, catalog number: 21985-023 )
  10. OVA257-264 synthetic peptide (Sigma-Aldrich, catalog number: S7951 )
  11. Ficoll-PaqueTM Premium 1.084 (GE Healthcare, catalog number: 17-5446-02 )
  12. Antibodies:
    1. Anti-CD44 PerCpCy5.5 (clone: IM7) (eBioscience, catalog number: 45-0441 )
    2. Anti-CD62L APC (clone: MEL-14) (eBioscience, catalog number: 17-0621 )
  13. RBC lysis buffer (eBioscience, catalog number: 00-4333-57 )
  14. Bovine serum albumin (Thermo Fisher Scientific, catalog number: BP1605-100 )
  15. NaN3  (Sigma-Aldrich, catalog number: S8032 )
  16. T cell media (see Recipes)
  17. Staining buffer (in PBS) (see Recipes)

Equipment

  1. Centrifuge (Thermo Fischer Scientific, SorvallTM Legend RT)
  2. 70 µm cell strainer (BD Biosciences, Falcon®, catalog number: 352350 )
  3. 15 ml and 50ml Falcon tubes
  4. 24 well plates (BD Biosciences, Falcon®, catalog number: 353226 )
  5. T75 culture flask (Corning, catalog number: 430641 )
  6. 37 °C, 5% CO2 cell culture incubator

Procedure

  1. CD44hiCD62Llo Memory T cell differentiation proceeds under sterile tissue culture conditions
    1. Euthanize a OT-1 CD8 TCR transgenic mouse and take spleen, and (optional) lymph nodes.
    2. Splenocytes are RBC lysed followed by washing with PBS twice.

  2. OT-1 TCR stimulation with cognate peptide antigen
    1. Resuspend cells in 1 ml of T cell media and add OVA257-264 synthetic peptide to 1 µM.
    2. Incubate in the 5% CO2 at 37 °C for 1 h.
    3. Spin down cells at 1,500 rpm for 3 min at 4 °C and wash once with T cell media.
    4. Resuspend cells in 12 ml of T cell media and plate 1ml/well of a 24 well plate.
    5. Incubate in the 5% CO2 at 37 °C for 2 days.
    6. Harvest the cells by pipetting up and down, and pellet cells.
    7. Resuspend cells in 5 ml of T cell media, and load on to 2.5 ml of Ficoll.
    8. Spin down at 400 x g for 15 min at 4 °C.
    9. Transfer live cells on the interphase to a new 15 ml tube and fill up the tube with T cell media.
    10. Spin down cells at 1,500 rpm for 3 min at 4 °C.

  3. Memory T cell culture in the presence of IL-15
    1. Resuspend cells in 24 ml of T cell media containing rmIL15 (20 ng/ml). Culture cells in T75 flask for four days.
    2. Harvest and pellet cells for Ficoll gradient (repeat steps 9-12).
    3. Resuspend cells in 40 ml of T cell media containing rmIL15 (20 ng/ml). Culture in T75 flask for two days.
    4. Staining cells with anti-CD44 and CD62L antibodies in staining buffer for 15 min on ice.
    5. Wash with staining buffer twice, then proceeds flow cytometry analysis.


      Figure 1. CD44 and CD62L expression of differentiated memory T cells

Recipes

  1. T cell media
    RPMI-1640
    10% fetal bovine serum
    1% penicillin/streptomycin
    1% L-Glutamine
    1x 1 M Hepes
    1x MEM non-essential amino acids
    1x sodium pyruvate 100 mM
    1x 2-mercaptoethanol
  2. Staining buffer (in PBS)
    1% BSA
    0.02% NaN3

Acknowledgments

The protocol was adapted from a previously described study (Manjunath et al., 2001). This work was supported by the Starr Cancer Consortium (13-A123 to M.O.L. and M.Q.Z.), the Rita Allen Foundation (M.O.L.), the NBRPC (2012CB316503 to M.Q.Z), and the NIH (HG001696 to M.Q.Z.).

References

  1. Kim, M. V., Ouyang, W., Liao, W., Zhang, M. Q. and Li, M. O. (2013). The transcription factor Foxo1 controls central-memory CD8+ T cell responses to infection. Immunity 39(2): 286-297.
  2. Manjunath, N., Shankar, P., Wan, J., Weninger, W., Crowley, M., Hieshima, K., Springer, T., Fan, X., Shen, H. and Lieberman, J. (2001). Effector differentiation is not prerequisite for generation of memory cytotoxic T lymphocytes. J Clin Invest 108(6): 871-878.
Copyright: © 2014 The Authors; exclusive licensee Bio-protocol LLC.
How to cite: Kim, M. V., Ouyang, W., Liao, W., Zhang, M. Q. and Li, M. O. (2014). Murine in vitro Memory T Cell Differentiation. Bio-protocol 4(13): e1171. DOI: 10.21769/BioProtoc.1171.
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