The GSDMD Knockout A-549 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population generated from the human A-549 lung adenocarcinoma epithelial cell line. This heterogeneous pool carries disruptive mutations at the GSDMD locus, resulting in a collective ablation of GSDMD protein expression. The polyclonal format provides a consistent loss-of-function model while avoiding the clonal biases inherent to single-cell-derived knockout lines.
A-549 cells were originally isolated from a human lung adenocarcinoma and are widely employed as an in vitro model of alveolar type II pulmonary epithelium. These adherent epithelial cells express hallmark markers of type II pneumocytes and respond to pro-inflammatory signals such as cytokines and pathogen-associated molecular patterns. They are extensively used in cancer biology, drug metabolism, and respiratory disease research, and they express core inflammasome components, making them valuable for studying pyroptotic cell death.
GSDMD encodes gasdermin D, the key pore-forming executioner of pyroptosis. Upon inflammasome activation, sensors such as NLRP3, AIM2, or NLRC4 recruit ASC and activate caspase-1, which cleaves GSDMD to generate the N-terminal pore-forming fragment. This fragment oligomerizes and inserts into the plasma membrane, forming large pores that cause cell swelling, lysis, and the release of pro-inflammatory cytokines IL-1?? and IL-18. In the non-canonical pathway, cytosolic LPS triggers caspase-4/5-mediated GSDMD cleavage. GSDMD pore assembly is facilitated by cardiolipin binding and interactions with NLRP3 and ASC. Downstream readouts include LDH release, HMGB1 secretion, and propidium iodide uptake, all indicative of pyroptotic cell death.
In the A-549 lung epithelial context, GSDMD knockout eliminates pyroptotic responses to canonical inflammasome activators like LPS plus nigericin or ATP. This model enables precise dissection of pyroptosis from apoptosis and necroptosis, which often coexist in inflamed tumor microenvironments. It is particularly relevant for studying how GSDMD-mediated cell death influences immune cell recruitment and drug sensitivity in lung adenocarcinoma, as well as for investigating epithelial pyroptosis in acute lung injury and bacterial pneumonia.
This polyclonal knockout pool supports a wide range of functional assays. Western blotting confirms loss of both full-length and cleaved GSDMD. LDH release and propidium iodide uptake assays quantify cell lysis, while ELISA measures IL-1?? and IL-18 secretion. Immunofluorescence imaging visualizes the absence of N-GSDMD pore formation. The cells are well-suited for genetic complementation studies, high-throughput screening of inflammasome inhibitors, and co-culture experiments to assess paracrine signaling. For detailed technical inquiries, please contact Ascent Research.
