Written and maintained by CASRAI Editorial Board
Last updated
Short Answer: What Are Jurkat Cells?
Jurkat cells are an immortalized human T lymphocyte cell line established from the peripheral blood of a 14-year-old male with acute T-cell lymphoblastic leukemia. Growing as suspension lymphoblasts, they serve as the standard model for studying T-cell receptor signaling, CD3 surface expression, cellular activation, and interleukin-2 induction in immunology, virology, and cancer pharmacology.
Definition and Scope: Lineage, Origin, and Biological Markers
Established in 1976 from a 14-year-old male with acute lymphoblastic leukemia (ALL) at first relapse, the line was designated JM by Schneider et al. before deposition as Jurkat. Reference accessions include DSMZ ACC 282, ATCC TIB-152, and Cellosaurus CVCL_0065 and CVCL_0367.
What Is a T Cell Cell Line?
A T cell cell line is an immortalized in vitro population of T lymphocytes capable of continuous proliferation. Unlike primary donor T cells, which enter senescence within weeks, immortalized lines divide indefinitely while retaining core immunological receptors, offering a renewable platform for genetic assays.
Do Jurkat Cells Express CD3?
Yes, standard Jurkat cells express surface CD3 within the T-cell receptor (TCR α/β) complex. Characterization by DSMZ (ACC 282) confirms an immunophenotype positive for surface CD3, cytoplasmic CD3 (cyCD3+), CD2, CD5, CD6, CD7, and TCR α/β, while negative for CD4 and CD8 surface glycoproteins under baseline conditions. This surface CD3 enables activation via anti-CD3 monoclonal antibodies (such as OKT3).
What Is the Typical Size of Jurkat Cells?
Jurkat cells are spherical suspension lymphoblasts with diameters ranging between 10 μm and 16 μm, averaging 11.3 μm to 11.5 μm. Automated counters set detection gates from 7 μm to 18 μm to distinguish intact cells from debris and doublets.
Adherent or Suspension Morphology
Jurkat cells grow strictly in suspension as single cells and loose clusters without adhering to tissue culture plastic. Routine passaging requires no enzymatic detachment reagents; treating them with trypsin cleaves surface receptors and impairs signaling assays.
How Jurkat Cells Work and Are Used in Research Practice
Jurkat cells serve as the primary human model for dissecting T-cell receptor (TCR) signaling. Ligation of the surface TCR/CD3 complex activates tyrosine kinases Lck and ZAP-70, stimulating phospholipase C-gamma-1 (PLC-γ1) and triggering calcium influx alongside protein kinase C (PKC) activation.
This pathway induces transcription factors NFAT, AP-1, and NF-κB to translocate to the nucleus and activate the interleukin-2 (IL2) promoter. Stimulation with PMA and ionomycin induces robust IL-2 secretion, demonstrated by Weiss et al. in Clone E6-1.
Key research applications include:
- CAR-T Screening: Reporter lines expressing GFP or luciferase driven by NFAT or NF-κB promoters allow rapid screening of chimeric antigen receptors (CARs) and bispecific T-cell engagers (BiTEs).
- Virology and HIV-1 Latency: Documented in NCBI MeSH descriptor D019141, Jurkat cells express CXCR4 and support HIV-1 infection, serving as a primary chassis for latency-reversing drug discovery.
- TCR Reconstitution: Receptor-deficient subclones enable transfection of exogenous TCR alpha and beta chains to assess antigen specificity and avidity.
Types and Related Concepts: Comparison of Key Jurkat Clones
Mutagenesis and subcloning have produced specialized derivative lines to isolate specific signaling nodes:
| Clone / Line | Repository Reference | Genetic Hallmark | CD3 / TCR Expression | Primary Application |
|---|---|---|---|---|
| Parental Jurkat (JM) | DSMZ ACC 282, Cellosaurus CVCL_0065 | Wild-type leukemic isolate established in 1976 | CD3+, TCR α/β+ | Baseline T lymphoblast biology |
| Jurkat, Clone E6-1 | ATCC TIB-152, Cellosaurus CVCL_0367 | Subclone selected by Weiss et al. (1984) for high IL-2 induction | CD3+, TCR α/β+ | Standard host for TCR signaling and CAR-T screening |
| J.CaM1.6 | Cellosaurus CVCL_4458 | Mutant deficient in functional Lck tyrosine kinase | CD3+, TCR α/β+ (defective downstream flux) | Dissecting proximal tyrosine kinase signaling |
| J.RT3-T3.5 | Cellosaurus CVCL_1337 | Mutant lacking TCR beta chain synthesis | CD3- (surface complex unexpressed), TCR- | TCR reconstitution and synthetic chain evaluation |
Recommended Culture Protocol and Laboratory Handling
What Is the Recommended Culture Protocol for the Jurkat Cell Line?
Maintain Jurkat Clone E6-1 in RPMI 1640 medium with 10% heat-inactivated fetal bovine serum (FBS) and 2 mM L-glutamine (or GlutaMAX). Adding 10 mM HEPES buffer stabilizes pH. Media should follow verified culture media preparation protocols and filtration sterilization using 0.22 μm membranes prior to use.
Standard culture parameters include:
- Incubation: 37 °C in a humidified 5% CO2 incubator.
- Seeding Density: Seed fresh cultures at 1 × 10^5 to 2 × 10^5 viable cells/mL.
- Operating Density: Maintain between 1 × 10^5 and 8 × 10^5 cells/mL, with an average doubling time of 25 to 35 hours. Do not exceed 1 × 10^6 to 3 × 10^6 cells/mL; overgrowth triggers lactic acid accumulation, acidification, and apoptosis.
- Subculturing: Dilute cultures 1:3 to 1:5 every 2 to 3 days with fresh medium. To exchange media, pellet cells at 1,200 rpm (~200 × g) for 5 minutes. For cytologic checks, prepare uniform smears using cytospin centrifugation.
- Cryopreservation: Freeze at 5 × 10^6 cells/mL in complete medium containing 5% to 10% DMSO at -1 °C/minute to -80 °C before liquid nitrogen vapor storage. Thaw rapidly at 37 °C and dilute into 9 mL of warm medium before centrifugation.
Where Jurkat Cells Matter for Laboratory Operations and Supply Planning
Managing Jurkat cultures requires forecasting consumables, including RPMI 1640 medium, low-endotoxin FBS, and suspension flasks. Standardizing workflows via laboratory standard operating procedures and platforms like the protocols.io research platform ensures reproducible handling.
For research administration, Jurkat cells provide an accessible alternative to primary human peripheral blood mononuclear cells (PBMCs). While primary cells require recurring donor recruitment, pathogen screening, and lot validation, Jurkat cultures deliver continuous, scalable biomass for assay optimization and high-throughput drug screening.
Common Misunderstandings and Pitfalls
- Equating with Normal T Cells: Jurkat cells carry somatic PTEN and SHIP-1 mutations, driving constitutive PI3K/Akt activation that differs from resting primary T cells.
- Passage Drift and Loss of CD3: Extended culture (>20 to 30 passages) leads to clonal drift and down-regulation of surface CD3/TCR complexes. Stocks should be renewed from master cryovials every 2 to 3 months.
- Trypsinizing Suspension Cells: Applying enzymatic detachment reagents is unnecessary and cleaves surface signaling receptors.
- Omitting Authentication: Confirm identity by regular Short Tandem Repeat (STR) profiling against DSMZ and ATCC benchmarks alongside monthly mycoplasma testing.
Frequently Asked Questions
What is a T cell cell line?
A T cell cell line is an immortalized in vitro population of T lymphocytes capable of continuous proliferation under culture conditions. It retains key T-cell receptor components and downstream signaling cascades, offering a renewable alternative to donor-derived primary T cells.
What is the recommended culture protocol for the Jurkat cell line?
The standard protocol employs RPMI 1640 medium with 10% heat-inactivated FBS, 2 mM L-glutamine, and optional 10 mM HEPES at 37 °C with 5% CO2. Cultures are seeded at 1 × 10^5 to 2 × 10^5 cells/mL, maintained below 8 × 10^5 cells/mL, and subcultured every 2 to 3 days by gentle dilution or centrifugation at 1,200 rpm for 5 minutes.
Do Jurkat cells express CD3?
Yes, standard Jurkat cells (such as Clone E6-1 and parent DSMZ ACC 282) express surface CD3 in complex with TCR α/β, alongside cytoplasmic CD3, CD2, CD5, CD6, and CD7, while testing negative for surface CD4 and CD8.
What is the typical size of Jurkat cells?
Jurkat cells range in diameter from 10 μm to 16 μm, with an average spherical cell diameter of approximately 11.3 μm to 11.5 μm.
Sources
- Leibniz Institute DSMZ (German Collection of Microorganisms and Cell Cultures). Human Cell Line JURKAT (ACC 282). https://www.dsmz.de/collection/catalogue/details/culture/ACC-282 (Accessed 2026-11-07).
- American Type Culture Collection (ATCC). Jurkat, Clone E6-1 (ATCC TIB-152). https://www.atcc.org/products/tib-152 (Accessed 2026-11-07).
- SIB Swiss Institute of Bioinformatics. Cellosaurus Entry CVCL_0367 (Jurkat E6.1) and CVCL_0065 (Jurkat). https://www.cellosaurus.org/CVCL_0367 (Accessed 2026-11-07).
- UCSC Genome Browser / ENCODE Project. Cell Growth Protocol for Jurkat Cell Line (Clone E6-1, ATCC TIB-152). https://genome.ucsc.edu/ENCODE/protocols/cell/human/Jurkat_Neff_protocol.html (Accessed 2026-11-07).
- National Center for Biotechnology Information (NCBI). Jurkat Cells (MeSH Descriptor D019141). https://www.ncbi.nlm.nih.gov/mesh/68019141 (Accessed 2026-11-07).
