Cryopreserved vial (10 x 10^6 cells) of CD4+ T cells that were negatively selected from freshly isolated primary human peripheral blood mononuclear cells (PBMCs). The PBMCs came from a healthy donor, and were isolated from whole blood or leukapheresis samples using a Ficoll gradient. Magnetic antibodies to monocytes, granulocytes, CD8+ T cells, gamma/delta T cells and other immune subsets present in PBMCs were then used to purify untouched CD4+ T cells via immunomagnetic separation. Before and after CD4+ T cell isolation, the cells were stained to evaluate purity and viability by flow cytometry. Cells were cryopreserved in CryoStor CS10 cryopreservation medium (Stemcell, #07930) at a controlled rate.Source Normal human PBMC from Leukapheresis Sample
Characterization Criteria Cell count, viability (trypan blue exclusion and FACS with impermeable DNA binding dye), and surface expression of CD3 and CD4
Storage Stability
Store cells at -135°C or colder. Thawed cells should be used immediately for downstream applications. Because these are primary cells, we do not recommend maintaining these cells in culture for long periods of time.