The GSDME Knockout DLD-1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the DLD-1 human colorectal adenocarcinoma cell line, designed as a loss-of-function model for GSDME. This heterogeneous pool, generated by CRISPR/Cas9-mediated gene disruption, abolishes GSDME expression across the cell mixture while preserving inherent genetic diversity, facilitating functional studies without clonal isolation. It serves as a versatile tool for investigating GSDME-dependent processes in colorectal cancer.
The parental DLD-1 cell line is a well-established human colorectal adenocarcinoma epithelial line from a male patient. Widely used in cancer biology, DLD-1 cells are instrumental for studying colorectal tumorigenesis, drug responses, and signaling. This knockout derivative retains the original line??s epithelial morphology and growth properties, providing a disease-relevant context for GSDME research.
GSDME is a pore-forming executor of pyroptosis. Cleaved by caspase-3??activated via mitochondrial outer membrane permeabilization involving BAX, BAK, cytochrome c, and APAF-1??its N-terminal fragment oligomerizes to form plasma membrane pores, causing cell swelling, lysis, and release of HMGB1, LDH, and pro-inflammatory cytokines. Upstream mediators include caspase-8, granzyme B, TNF-alpha, and chemotherapeutics like cisplatin and doxorubicin; downstream, immunogenic cell death markers calreticulin and ATP are exposed. GSDME thus switches apoptosis to pyroptosis when caspase-3 is active.
In DLD-1 colorectal cancer cells, GSDME-mediated pyroptosis is pivotal for understanding chemotherapy-induced immunogenic cell death and its impact on antitumor immunity. Many chemotherapies trigger GSDME-dependent cytotoxicity; knockout of GSDME enables distinction between pyroptosis and apoptosis and assessment of inflammatory death in tumor suppression. This model is essential for dissecting cell death modality switching and exploring pyroptosis induction as a therapeutic approach.
This knockout cell population supports applications including Western blotting for GSDME cleavage, LDH release assays, HMGB1 ELISA, and flow cytometry (Annexin V/PI) to characterize pyroptosis. Immunofluorescence can visualize pore formation, while RT-qPCR quantifies transcript levels, and caspase-3 activity assays correlate with cleavage. The cells are suitable for tumor cell death studies with chemotherapeutics, drug screening for pyroptosis modulators, and investigation of the immune microenvironment. For further information, contact Ascent Research.
