The CASP8 Knockout MES-OV Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the MES-OV mouse embryonic stem cell line, designed to provide a loss-of-function model for the Casp8 gene. This product consists of a heterogeneous pool of edited cells, enabling robust and flexible experimental workflows without single-cell clonal selection. By targeting CASP8, researchers can investigate its critical functions in cell death, inflammation, and development within a pluripotent stem cell context.
MES-OV is a well-characterized 129/Sv mouse embryonic stem cell line that retains pluripotency and the ability to differentiate into derivatives of all three germ layers. As a reliable and widely used model, it supports in vitro differentiation assays, developmental studies, and disease modeling. Its stable genetic background and capacity for multi-lineage commitment make it particularly suitable for examining gene function in early embryogenesis and cell fate decisions.
Caspase-8 (CASP8) functions as an initiator caspase in extrinsic apoptosis, recruited to the death-inducing signaling complex (DISC) upon engagement of death receptors such as Fas, TRAIL-R1, TRAIL-R2, and TNF-R1. There, it interacts with FADD and undergoes autoproteolytic activation. Active caspase-8 cleaves and activates executioner caspases-3 and -7, as well as the pro-apoptotic Bcl-2 family member Bid, linking extrinsic signals to mitochondrial apoptosis. In addition, caspase-8 proteolytically inactivates RIPK1 and RIPK3 to suppress necroptosis and participates in inflammatory signaling via Toll-like and RIG-I-like receptor pathways. Its activity is modulated by c-FLIP, TRAF2, cIAPs, and other interacting factors, placing it at a key decision point between cell survival, apoptosis, and necroptosis.
In the pluripotent MES-OV background, CASP8 disruption is expected to impair death receptor-induced apoptosis while potentially priming cells for necroptosis under caspase-compromised conditions. This model allows dissection of caspase-8-dependent versus -independent cell death modalities and may reveal roles in stem cell self-renewal, differentiation, and stress responses. Given the involvement of CASP8 in autoimmune lymphoproliferative syndrome, cancer, neurodegenerative diseases, and inflammatory disorders, these polyclonal knockout cells offer a versatile platform for mechanistic studies.
Typical applications include death receptor stimulation assays (e.g., TNF?? plus cycloheximide), Western blotting for caspase-8 and cleaved caspase-3, flow cytometric Annexin V/PI apoptosis analysis, caspase-8 activity measurements, co-immunoprecipitation of DISC components, RT-qPCR profiling of downstream targets, and immunofluorescence localization studies. These approaches enable detailed investigation of apoptosis signaling, necroptosis regulation, cancer cell death resistance, and inflammatory pathways. For more information, please contact Ascent Research.
