The GSDMD Knockout NCI-H1703 Polyclonal Cells product is a CRISPR/Cas9-edited polyclonal knockout cell population targeting the GSDMD gene in the human NCI-H1703 cell line. This engineered cell pool enables loss-of-function studies of GSDMD, a pivotal mediator of pyroptotic cell death. The knockout is achieved through CRISPR/Cas9-mediated gene disruption, producing a heterogeneous population with targeted genetic ablation, suitable for functional assays without clonal selection artifacts.
The parental NCI-H1703 cell line is a well-characterized human lung squamous cell carcinoma model, originally established from a primary tumor of a 54-year-old male. These cells exhibit adherent epithelial morphology and maintain tumorigenic properties, making them a relevant platform for investigating molecular mechanisms in non-small cell lung cancer. Their squamous cell carcinoma origin positions them as a valuable host for studying cell death pathways in the context of lung cancer biology.
GSDMD functions as the executioner protein of pyroptosis, a lytic and inflammatory form of programmed cell death. Upon activation of canonical and non?canonical inflammasomes??including NLRP3, AIM2, and NLRC4??caspase?1 is activated, which cleaves GSDMD to release its N?terminal pore?forming domain. This fragment oligomerizes in the plasma membrane, creating pores that mediate the release of mature IL?1?? and IL?18, as well as LDH and HMGB1, culminating in cell swelling and rupture. GSDMD is also directly cleaved by caspase?4, caspase?5, and caspase?11 in the non?canonical pathway, linking cytosolic LPS sensing to pyroptosis. The knockout cell pool thus disrupts this critical execution step, blocking inflammatory cell death downstream of multiple inflammasome signals.
In the NCI-H1703 lung cancer model, GSDMD knockout has profound implications for understanding the interplay between pyroptosis and tumor biology. Squamous cell carcinoma of the lung often exhibits altered cell death and inflammatory responses, which can influence tumor growth, immune evasion, and therapeutic resistance. By abolishing GSDMD-dependent pore formation, these knockout cells allow researchers to dissect the specific contribution of pyroptosis to tumor cell survival, cytokine-mediated communication with the microenvironment, and response to chemotherapeutic or targeted agents. This model facilitates the exploration of pyroptosis as a double-edged sword in cancer??whether it promotes antitumor immunity or fosters a pro?tumor inflammatory niche.
Researchers can utilize this polyclonal knockout population in diverse experimental paradigms. Representative applications include western blotting for GSDMD cleavage products, LDH release assays to quantify pyroptotic lysis, ELISA measurement of secreted IL?1?? and IL?18, and propidium iodide uptake assays to evaluate pore formation. Additionally, caspase?1 activity assays, immunofluorescence for GSDMD?N translocation, and co?immunoprecipitation of GSDMD with caspase?1 are well?suited. The model supports screening for pyroptosis modulators, studying inflammasome pathways in lung cancer inflammation, and investigating GSDMD??s role in drug resistance. For further details or to discuss your specific experimental needs, please contact Ascent Research.
