If you work in immunology, T-cell biology, or CAR-T cell research, you have almost certainly encountered Jurkat cells. They are one of the most widely used human cell lines in immunological research, second only to HeLa in some estimates of total citation volume.
Despite being derived from a cancer patient in the 1970s, Jurkat cells have become a standard model for studying T-cell signaling, activation, apoptosis, and more recently, for developing and testing CAR-T cell constructs. This guide covers everything researchers need to know about Jurkat cells: where they came from, what they are, how they behave in culture, and when to use them versus other models.
What Are Jurkat Cells?
Jurkat cells are an immortalized human T lymphocyte cell line derived from the peripheral blood of a 14 year old male patient diagnosed with T-cell leukemia. They are suspension-growing cells, meaning they float freely in culture medium rather than attaching to a surface, which reflects the natural behavior of blood-derived immune cells.
Despite their leukemic origin, Jurkat cells are used primarily as a model of normal CD4-positive T helper cells. They express many of the surface markers and signaling molecules found on mature T cells, including CD3, CD4, the T-cell receptor (TCR) complex, and key intracellular signaling proteins.
Origin and History
Jurkat cells were originally established in the late 1970s by researchers at the University of Colorado. The original culture was derived from a relapsed acute T-cell leukemia patient and was initially called JM cells. Different subclones were developed over the following years, with the E6-1 subclone becoming the most widely adopted in research.
The E6-1 subclone (ATCC TIB-152) is now the standard Jurkat reference strain. When researchers refer to Jurkat cells without specifying a subclone, they are almost always referring to E6-1 or a closely related derivative.
The cell line gained widespread adoption in the 1980s and 1990s as researchers studying T-cell activation pathways needed a human model that could be cultured easily in large quantities. Primary T cells require donor blood, complex isolation procedures, and have a limited lifespan in culture. Jurkat cells solved all three problems.
Key Characteristics of Jurkat Cells
Growth Pattern
Jurkat cells are suspension cells. They do not adhere to tissue culture plastic and grow freely in liquid medium. This is typical of hematopoietic cell lines and reflects their blood cell origin.
Doubling Time
Under optimal conditions, Jurkat cells double every 20 to 24 hours. This relatively fast growth rate makes them practical for experiments requiring large cell numbers in a short time.
Cell Size and Morphology
Jurkat cells are round, non-adherent lymphoblasts. They are typically 10 to 15 micrometers in diameter. Under a microscope, they appear as smooth, rounded cells freely distributed throughout the medium.
Surface Markers
Jurkat E6-1 cells express CD3, CD4, CD45, and the TCR alpha-beta complex. They do not express CD8, making them a model of CD4-positive T helper cells rather than cytotoxic CD8-positive T cells. They also express CXCR4, the co-receptor for HIV-1, which led to their early use in HIV research.
Key Genetic Features
Jurkat cells lack functional PTEN, leading to constitutively elevated PI3K/AKT signaling. They also lack functional expression of Lck in some subclones. Researchers must account for these features when designing signaling experiments, as the absence of PTEN and variability in Lck expression can affect downstream pathway activity.
Important Limitation
Jurkat cells do not produce interleukin-2 (IL-2) in response to activation signals the way primary T cells do. This is a critical limitation for any experiment that depends on IL-2 secretion as a readout of T-cell activation. Researchers studying IL-2 production must use primary T cells.
What Are Jurkat Cells Used For?
T-Cell Receptor Signaling Studies
The most foundational use of Jurkat cells is studying the molecular events downstream of TCR activation. When the TCR complex is stimulated, a cascade of signaling events activates transcription factors including NFAT, NF-kB, and AP-1, which drive expression of immune response genes. Jurkat cells provide a reliable, easily manipulated human model for dissecting this signaling network.
NFAT Reporter Assays
One of the most common uses of engineered Jurkat lines is NFAT reporter assays. Jurkat cells stably expressing a luciferase gene under the control of an NFAT promoter (such as the Jurkat-Lucia NFAT cell line) allow researchers to quantify T-cell activation by measuring luciferase signal. This is widely used in antibody functional assays, drug screening, and CAR-T cell evaluation.
CAR-T Cell Research
The rise of CAR-T cell therapy has significantly increased the use of Jurkat cells. Jurkat cells are used to rapidly test whether a chimeric antigen receptor (CAR) construct is functional before introducing it into primary T cells. The CAR is introduced into Jurkat cells by lentiviral transduction or electroporation, and activation can be measured using reporter assays. This allows researchers to screen many CAR designs efficiently without consuming scarce primary T-cell material. This application overlaps with the broader field of engineered and stable expression cell lines used in immunotherapy development.
Apoptosis Research
Jurkat cells are highly sensitive to apoptosis induction and are one of the standard models for studying programmed cell death in T cells. They were used in foundational studies of Fas-mediated apoptosis and caspase activation pathways. They remain a common tool for evaluating compounds that induce or inhibit apoptosis in T lymphocytes.
HIV Research
Because Jurkat cells express CD4 and CXCR4, the receptors used by HIV-1 to enter T cells, they were extensively used in early HIV research to study viral entry, replication, and the effects of antiretroviral compounds. They remain a reference model in HIV biology despite the development of more sophisticated primary cell systems.
Drug Screening and Immunotoxicology
Jurkat cells are used in early-stage drug discovery and screening to evaluate compounds for effects on T-cell viability, activation, and signaling. In immunotoxicology, they serve as a rapid screening tool to flag compounds that may have undesirable immunosuppressive or immunostimulatory effects before more expensive primary cell or animal studies are conducted.
Transfection and Gene Expression Studies
Jurkat cells can be transfected with plasmid DNA using electroporation or chemical transfection reagents, and transduced with lentiviral or retroviral vectors for stable gene integration. They are commonly used as a host cell for introducing reporter constructs, knockout constructs, or overexpression vectors to study gene function in a T-cell context.
Common Jurkat Sublines and Derivatives
Jurkat E6-1
The reference subclone. Used as the standard Jurkat model in most research. ATCC catalog number TIB-152. Expresses CD3, CD4, and TCR alpha-beta.
Jurkat 76
A TCR-negative derivative of Jurkat. Used specifically when researchers want to study a CAR or exogenous TCR construct without interference from endogenous TCR signaling. Essential for CAR-T cell research where clean background signal is required.
Jurkat-Lucia NFAT
Stably expresses a luciferase reporter gene under the NFAT promoter. Used for quantitative T-cell activation assays and for evaluating checkpoint inhibitor antibodies, bispecific T-cell engagers, and CAR constructs.
Jurkat-Lucia NFAT-CD16
Expresses both the NFAT-luciferase reporter and CD16 (FcgammaRIII), the Fc receptor found on natural killer cells. Used specifically for ADCC (antibody-dependent cellular cytotoxicity) reporter assays, which evaluate the ability of antibodies to trigger immune cell killing.
Human Lck Knockout Jurkat
Lacks expression of Lck, a kinase critical for TCR signaling. Used to study the specific role of Lck in T-cell activation and to reconstitute signaling with wild-type or mutant Lck constructs.
How to Culture Jurkat Cells
Culture Medium
Jurkat cells are typically cultured in RPMI-1640 medium supplemented with 10 percent fetal bovine serum and 2 mM L-glutamine. Some protocols include penicillin and streptomycin, though antibiotics should be avoided during transfection.
Seeding and Maintenance
Jurkat cells should be maintained at a density of 1 x 10 to the 5th to 1 x 10 to the 6th cells per milliliter. They should not be allowed to exceed 2 x 10 to the 6th cells per milliliter, as overcrowding leads to rapid decline in viability. Cells should be split every two to three days by dilution.
Incubation Conditions
Standard incubation at 37 degrees Celsius with 5 percent CO2 and humidified atmosphere. No special surface coating is required because the cells grow in suspension.
Freezing and Recovery
Jurkat cells cryopreserve well in a standard freezing medium containing 90 percent FBS and 10 percent DMSO. They should be frozen at a density of 1 to 5 x 10 to the 6th cells per milliliter. Recovery after thawing is generally straightforward: thaw quickly at 37 degrees, dilute slowly into warm medium, and centrifuge before resuspending in fresh medium.
Mycoplasma and Authentication
Jurkat cells, like all cell lines used in publication-quality research, should be tested for mycoplasma contamination and authenticated by STR profiling before use. For detailed guidance on why authentication matters and how to do it, see our guide on cell line authentication and STR profiling.
Jurkat Cells vs Primary T Cells: When to Use Each
Jurkat cells offer speed, consistency, and scalability. Primary T cells offer biological relevance.
Use Jurkat cells when screening many conditions or compounds, when developing or testing CAR constructs before moving to primary cells, when studying specific signaling pathways with genetic manipulation, when standardized, reproducible results across experiments are the priority, or when primary T cells are not available or practical.
Use primary T cells when IL-2 secretion or cytokine production is the readout, when studying responses in the context of a donor's specific immune background, when the experiment requires physiologically normal T-cell function and activation, or when preparing for clinical-grade CAR-T cell manufacturing.
Frequently Asked Questions
What are Jurkat cells?
An immortalized human T lymphocyte cell line derived from a 14 year old patient with T-cell leukemia. Widely used as a model of CD4-positive T helper cells in immunology research.
Are Jurkat cells CD4 or CD8 positive?
Jurkat E6-1 cells are CD4 positive and CD8 negative. They model CD4-positive T helper cells, not cytotoxic CD8 T cells.
Are Jurkat cells suspension or adherent?
Suspension. Jurkat cells grow freely in culture medium and do not attach to tissue culture plastic.
What is the doubling time of Jurkat cells?
Approximately 20 to 24 hours under optimal culture conditions.
What medium do Jurkat cells use?
RPMI-1640 with 10 percent FBS and 2 mM L-glutamine. They should be maintained between 1 x 10 to the 5th and 1 x 10 to the 6th cells per milliliter.
Do Jurkat cells express CD3?
Yes. Jurkat E6-1 cells express CD3 as part of the TCR complex, which is one of the reasons they are used as a T-cell model for activation and signaling studies.
What is Jurkat 76?
A TCR-negative derivative of Jurkat E6-1. Used in CAR-T cell research when a clean background free of endogenous TCR signaling is required.
Can Jurkat cells be used for CAR-T research?
Yes. Jurkat cells, especially Jurkat 76 and NFAT reporter lines, are widely used for rapid testing and screening of CAR constructs before moving to primary T cells.
What are the limitations of Jurkat cells?
They lack functional PTEN, have variable Lck expression, and do not produce IL-2 upon activation. They are a leukemic line and do not fully replicate the biology of normal primary T cells.
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Learn what Jurkat cells are, where they come from, their key characteristics, sublines, culture protocol, and how they are used in T-cell signaling and CAR-T research.