The GSN Knockout NCI-H1975 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from human NCI-H1975 lung adenocarcinoma cells, designed to disrupt the gelsolin (GSN) gene. This knockout model provides a loss-of-function system to investigate the roles of gelsolin in cytoskeletal dynamics, cell motility, and apoptosis. The polyclonal nature of the population preserves genetic diversity, offering a more physiologically relevant model compared to monoclonal lines, which is advantageous for studying heterogeneous tumor behaviors.
NCI-H1975 is a widely used non-small cell lung cancer cell line established from a patient with lung adenocarcinoma. These cells carry EGFR L858R and T790M mutations, which result in constitutive kinase activation and sustained downstream signaling. The T790M mutation is particularly known to confer resistance to first- and second-generation EGFR tyrosine kinase inhibitors, making this line valuable for investigating mechanisms of acquired drug resistance.
Gelsolin, encoded by GSN, is a calcium-dependent actin filament severing and capping protein that critically regulates cytoskeleton remodeling. It functions downstream of Ca2? and phosphatidylinositol 4,5-bisphosphate (PIP2) signals, and is activated by caspase-3 cleavage during apoptosis. GSN interacts with actin, tropomyosin, and other cytoskeletal proteins, and its activity influences the Arp2/3 complex and cofilin pathways. Transcriptional regulation of GSN involves p53 and NF-??B, linking it to stress responses and survival pathways. In cancer, gelsolin modulates PI3K/AKT signaling, cell migration, and invasion.
In NCI-H1975 cells, GSN knockout disrupts actin filament turnover, leading to altered cytoskeletal organization, impaired cell motility, and modified apoptotic responses. This model enables dissection of gelsolin??s specific contributions to EGFR-driven signaling pathways, particularly those involving AKT and cell migration. Given the dual EGFR mutations, these cells exhibit enhanced PI3K/AKT activity, and loss of gelsolin may reveal dependencies on actin remodeling for tumor progression and metastasis. The knockout thus provides a platform to study the intersection of oncogenic signaling and cytoskeletal control.
Typical applications include Western blotting for knockout confirmation, immunofluorescence microscopy for F-actin visualization, and Transwell assays for assessing migration and invasion deficits. Apoptosis can be evaluated by Annexin V staining and caspase-3 activity assays. Phospho-EGFR/AKT signaling analysis via Western blot reveals pathway alterations, while co-immunoprecipitation identifies altered protein interactions. This product is well-suited for research into cancer metastasis, drug resistance, and actin cytoskeleton regulation in EGFR-mutant lung adenocarcinoma. For further technical details or customized inquiries, please contact Ascent Research.
