THP1-defCASP1 Cells

Human monocytes with reduced Caspase-1 activity

THP1-defCASP1 cells are derived from THP-1 human monocytic cells.
THP-1 cells are the most commonly used model cell line for the study of inflammasome activation as they express high levels of NLRP3, ASC and pro-caspase-1.

THP1-defCASP1 cells are highly deficient for caspase-1 activity (~7 fold reduction). They produce significantly less IL-1β in response to stimuli that activate the inflammasomes, such as ATP, MSU, and chitosan ultrapure (NLRP3 inflammasome) or transfected poly(dA:dT) (AIM2 inflammasome), when compared to the parental cell line THP1-Null.

THP1-defCASP1 cells, together with the control cell line THP1-Null, allow to determine if a compound is an inflammasome inducer.
The production of IL-1β can be detected using HEK-Blue IL-1β reporter cell line or ELISA kits, such as InvivoGen’s LumiKine hIL-1β.

THP1-defCASP1 cells are resistant to hygromycin B.

Figures for this product

Expression of CASP1 determined by quantitative rt-PCr (A) and iL-1β production in THP1-null and THP1-defCASP1 cells (B)


Antibiotic resistance: hygromycin B

Growth Medium: RPMI 1640, 2 mM L-glutamine, 25 mM HEPES, 10% heat-inactivated fetal bovine serum, 100 μg/ml Normocin™, Pen-Strep (50 U/ml-50 μg/ml)

Quality Control
The reduction in Caspase-1 activity in THP1-defCASP1 cells was confirmed by qRT-PCR and a functionality assay using inflammasome inducers.
THP1-defCASP1 cells are guaranteed mycoplasma-free.

Shipped on dry ice


• 1 vial of THP1-defCASP1 cells (3-7 x 106 cells) in Freezing Medium.
• 1 ml Normocin™ (50 mg/ml). Normocin™ is a formulation of three antibiotics active against mycoplasmas, bacteria and fungi.
• 100 μl Hygromycin B Gold (ultrapure Hygromycin B; provided at 100 mg/ml).

Cells are shipped frozen. If cells are not frozen upon arrival, contact InvivoGen immediately.



THP1-defCASP1 cells are designed to study the signals involved in inflammasome activation.

To become susceptible to inflammasome inducers, these cells must be induced by stimuli commonly used for induction in model systems, such as lipopolysaccharide (LPS) and phorbol 12-myristate acetate (PMA). Stimulation by LPS or differentiation with PMA induces the production of pro-IL-1β, the immature form of IL-1β. Subsequent stimulation with inflammasome inducers, such as ATP and alum crystals, leads to caspase-1 activation and IL-1β maturation and secretion. Mature IL-1β can be detected by Western blot, ELISA, or a cell-based assay.

InvivoGen has developed a new method to detect bioactive IL-1β, based on HEK293 cells specifically engineered to selectively respond to IL-1β, named HEK-Blue™ IL-1β cells. These cells feature the SEAP (secreted embryonic alkaline phosphatase) reporter gene under the control of an NF-kB-inducible promoter. They naturally express the IL-1β receptor (IL-1R), and all the proteins involved in the MyD88-dependent IL-1R signaling pathway that leads to NF-kB activation. Thus upon IL-1β binding to IL-1R, a signaling cascade is initiated triggering NF-kB activation and the subsequent production of SEAP. Detection of SEAP in the supernatant of HEK-Blue™ IL-1β cells can be readily assessed using QUANTI-Blue™, a SEAP detection medium. QUANTI-Blue™ turns blue in the presence of SEAP which can be easily quantified using a spectrophotometer.

Note: InvivoGen also provides HEK-Blue™ IL-18/IL-1β cells for the detection of bioactive IL-18 and IL-1β. HEK-Blue™ IL-18/IL-1β cells are derived from HEK-Blue™ IL-1β cells by stable transfection of the IL-18RAP gene.

Detection of IL-1β in THP-1 supernatants

Detection of IL-1beta in THP-1 supernatants


Recent articles using InvivoGen THP1-defCASP1 Cells


THP1-defCASP1 Cells

Description Human THP-1 Monocytes - caspase-1 deficient
Cat. Codethp-dcasp1
Unit Size3-7 x 10e6 cells
Price For price or distributor address,
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