The GSDMD Knockout MCF-7 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population of the MCF-7 human breast adenocarcinoma cell line, engineered for the disruption of the GSDMD gene. This loss-of-function model is designed to facilitate the study of gasdermin D-mediated pyroptosis, inflammasome signaling, and inflammatory cytokine release in a hormone-responsive breast cancer epithelial context. The polyclonal nature of the knockout population reflects heterogeneous gene disruption across the cell pool, providing a robust tool for functional studies without the constraints of single-cell clonal selection.
MCF-7 is a well-characterized estrogen receptor (ER)-positive and progesterone receptor (PR)-positive breast epithelial adenocarcinoma cell line, originally isolated from the pleural effusion of a patient with metastatic breast cancer. This cell line retains hormone responsiveness and is widely employed in breast cancer research, including studies of hormone signaling, drug response, and tumor biology. Its epithelial origin and well-defined genetic background make it a suitable host for investigating the interplay between pyroptosis and breast tumor biology.
GSDMD encodes a pore-forming protein that serves as the executioner of pyroptotic cell death. Upon activation of canonical inflammasomes (such as NLRP3, AIM2, or NLRC4) or non-canonical cytosolic LPS sensing, GSDMD is cleaved by inflammatory caspases, including caspase-1, caspase-4, caspase-5, or caspase-11. The released N-terminal fragment oligomerizes in the plasma membrane, forming pores that disrupt ionic gradients, induce cell swelling and lysis, and mediate the secretion of pro-inflammatory cytokines IL-1?? and IL-18. GSDMD activity is regulated by upstream signals such as NF-??B-dependent transcription, potassium efflux, and reactive oxygen species (ROS), and its pore formation potentiates secondary NLRP3 inflammasome activation. Interacting factors include caspase-1, NLRP3, ASC, cardiolipin, and phosphatidylinositol phosphates.
In the MCF-7 breast cancer context, disruption of GSDMD expression allows researchers to dissect the role of pyroptosis in hormone-responsive breast epithelial cells. Since MCF-7 cells are ER- and PR-positive, this model enables investigation of how steroid hormone signaling may intersect with inflammatory cell death pathways. The knockout system is particularly relevant for studying the contribution of GSDMD to tumor microenvironment modulation, as pyroptosis-driven release of IL-1?? and other alarmins can influence immune cell recruitment and cancer-associated inflammation. Moreover, this model provides a platform to explore GSDMD’s potential involvement in breast cancer progression, metastasis, and response to therapeutics, linking innate immunity with oncology.
Key applications include functional analysis of pyroptosis induction by NLRP3, AIM2, or NLRC4 inflammasome activators and non-canonical LPS pathways. Typical assays are Western blotting for GSDMD cleavage, LDH release quantification, IL-1?? ELISA, caspase-1 activity measurements, and immunofluorescence for the N-terminal fragment. Live-cell imaging and flow cytometry monitor pore formation and cell death. The model suits drug screening for pyroptosis modulators, RNA-seq profiling, and co-culture studies. As a control, it aids GSDMD-dependent IL-1?? studies. Contact Ascent Research for details.
