Shreffler:JAX Basophil Activation: Difference between revisions
From OpenWetWare
Jump to navigationJump to search
(New page: ==Overview== Basophil activation in unfractionated samples such as PBMC (note basophils are less dense the Ficoll) or whole blood can be measured by changes in the expression of cell surf...) |
|||
Line 18: | Line 18: | ||
# Obtain whole blood specimens collected in sodium heparin tube (green top). | # Obtain whole blood specimens collected in sodium heparin tube (green top). | ||
# Record the total volume of blood | # Record the total volume of blood on the data form. | ||
# | # Aliquot 5 mL of RPMI into 15 mL conical tube and place it in a 37°C water bath to keep warm (for the dilution of stimulants and for the Unstained Control). | ||
# | # Remove pre-made stimulants (fMLP, Mouse allergen, CaI, PMA, Anti-IgE) from freezer. Label each stimulant and put aside to thaw. | ||
# Prepare 5 (30 µL) aliquots of Basophil medium and dilution as follows: | |||
## Add 3.6 µL of IL-3 into 180µL of warm RPMI | |||
## Aliquot 30 µL of RPMI + IL-3 into 5 (2mL) eppendorf tubes labeled as Basophil medium1 – Basophil medium5. | |||
## Add 270 µL of warm RPMI into each tube. | |||
# | |||
# | |||
# | |||
# | |||
# | |||
# | |||
# | |||
==Discussion== | ==Discussion== |
Revision as of 04:41, 20 October 2009
Overview
Basophil activation in unfractionated samples such as PBMC (note basophils are less dense the Ficoll) or whole blood can be measured by changes in the expression of cell surface markers or even intracellular events (e.g. phosphorylation, oxidative burst, calcium flux) by flow cytometry. Separate markers (e.g. as CD123+ HLA-DR-) are used to specifically identify basophils in addition to those used for assessment of activation.
This protocol is specifically for the JAX study.
Materials
- RPMI medium (cellgro, 10-040-CV; store at 4°C in dark)
- 1 X FACS lysing solution (made from 10X stock with dH2O; store at 4°C; expires in 1 week)
- PBS + 20 mM EDTA (sterile filter, store at 4°C; expires in 1 week)
- Staining Buffer (PBS + 2 mM EDTA + 0.5% BSA) (sterile filter, store at 4°C; aliquot in hood; expires in 2 months)
- monoclonal antibodies (e.g. CD63-FITC, CD203c-PE, CD123 PE-Cy5, CD69-APC-Cy7, HLA DR-PE-Cy7, CD3-APC, CD41a-APC)
- stimulant aliquots (pre-made, 30 μL aliquots, distributed by Mt. Sinai; stored at -20°C)
Procedure
- Obtain whole blood specimens collected in sodium heparin tube (green top).
- Record the total volume of blood on the data form.
- Aliquot 5 mL of RPMI into 15 mL conical tube and place it in a 37°C water bath to keep warm (for the dilution of stimulants and for the Unstained Control).
- Remove pre-made stimulants (fMLP, Mouse allergen, CaI, PMA, Anti-IgE) from freezer. Label each stimulant and put aside to thaw.
- Prepare 5 (30 µL) aliquots of Basophil medium and dilution as follows:
- Add 3.6 µL of IL-3 into 180µL of warm RPMI
- Aliquot 30 µL of RPMI + IL-3 into 5 (2mL) eppendorf tubes labeled as Basophil medium1 – Basophil medium5.
- Add 270 µL of warm RPMI into each tube.
Discussion
References
- Hennersdorf F, Florian S, Jakob A, Baumgärtner K, Sonneck K, Nordheim A, Biedermann T, Valent P, and Bühring HJ. Identification of CD13, CD107a, and CD164 as novel basophil-activation markers and dissection of two response patterns in time kinetics of IgE-dependent upregulation. Cell Res. 2005 May;15(5):325-35. DOI:10.1038/sj.cr.7290301 |
- Knol EF, Mul FP, Jansen H, Calafat J, and Roos D. Monitoring human basophil activation via CD63 monoclonal antibody 435. J Allergy Clin Immunol. 1991 Sep;88(3 Pt 1):328-38. DOI:10.1016/0091-6749(91)90094-5 |
- Shreffler WG. Evaluation of basophil activation in food allergy: present and future applications. Curr Opin Allergy Clin Immunol. 2006 Jun;6(3):226-33. DOI:10.1097/01.all.0000225165.83144.2f |
Contact
- Who has experience with this protocol?
- Email Wayne Shreffler through OpenWetWare