The KCNJ2 Knockout NCI-H1703 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal cell population in which the KCNJ2 gene has been targeted for disruption. This loss-of-function model ablates expression of the Kir2.1 inward rectifier potassium channel, enabling researchers to dissect its contributions to resting membrane potential maintenance, cellular excitability, and downstream signaling. As a polyclonal pool, the cells retain genetic heterogeneity, providing a more representative and robust system than clonal isolates for functional assays in a lung cancer context.
NCI-H1703 is an adherent, epithelial cell line derived from a male patient with squamous cell carcinoma of the lung. It serves as a well-characterized model of non-small cell lung cancer (NSCLC), retaining key oncogenic mutations and signaling aberrations. This host background allows the assessment of ion channel activity in a disease-relevant setting where potassium currents may influence tumor cell proliferation, migration, and drug response.
KCNJ2 encodes the Kir2.1 subunit, which forms strong inwardly rectifying potassium channels essential for setting the resting membrane potential. Kir2.1 activity is tightly controlled by PIP2, PKA, PKC, and membrane cholesterol, and its surface localization depends on SAP97, PSD-95, caveolin-3, and other MAGUK proteins. Loss of Kir2.1 abolishes inward rectifier potassium currents, leading to membrane depolarization and altered excitability. This functional change impinges on downstream processes like calcium signaling and action potential firing, and Kir2.1 functionally couples with Nav1.5, Cav1.2, KCNQ1, and KCNH2 in excitable tissues. The knockout thus provides a clear perturbation for studying these interconnected pathways.
In the NCI-H1703 lung carcinoma context, KCNJ2 knockout introduces a depolarized resting state that can reshape calcium dynamics and mitogenic signaling cascades. Emerging evidence suggests that potassium channels play critical roles in cancer cell physiology, including proliferation, apoptosis, and metastasis. The polyclonal nature of the edited population captures tumor heterogeneity, making it well-suited for experiments that demand biological replicates and reduction of single-clone bias. This model therefore bridges classical electrophysiology and cancer biology, enabling the investigation of Kir2.1-dependent mechanisms in NSCLC progression.
Designed for a range of research applications, these cells support cardiac arrhythmia studies, Andersen-Tawil syndrome modeling, investigations of neuronal excitability, and cancer electrophysiology. Compatible assays include patch-clamp electrophysiology, immunofluorescence, western blot, RT-qPCR, flow cytometry, and cell viability assays. The knockout cells facilitate the exploration of potassium channel contributions to lung cancer behavior and therapeutic vulnerabilities. For detailed product information, technical support, or to discuss custom gene-editing services, please contact Ascent Research.
