DNMBP Knockout A-549 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the A-549 human lung adenocarcinoma cell line, offering disrupted DNMBP gene function. This polyclonal pool provides a heterogeneous loss-of-function model, avoiding clonal artifacts and enabling robust investigation of DNMBP-dependent biological processes.
The parental A-549 cell line originates from a 58-year-old Caucasian male with lung adenocarcinoma and displays adherent epithelial morphology with expression of surfactant protein A. As an alveolar basal epithelial model, A-549 cells are widely used in cancer research, drug testing, and studies of epithelial barrier function, making them a physiologically relevant host for DNMBP knockout experiments.
DNMBP (also known as Tuba) functions as a scaffold protein and Cdc42-specific guanine nucleotide exchange factor (GEF) that regulates actin cytoskeleton dynamics at epithelial cell?Ccell junctions. Activated by cell-cell adhesion signals and phosphatidylinositol 4,5-bisphosphate (PIP2), DNMBP recruits and activates Cdc42, which in turn stimulates downstream effectors including PAK kinases and the WASP/Arp2/3 complex to promote local actin polymerization. DNMBP directly interacts with tight junction components such as ZO-1 and occludin, as well as cortactin and dynamin, contributing to the stabilization of adherens and tight junctions. Disruption of DNMBP is expected to impair Cdc42-mediated actin remodeling, potentially destabilizing junctional complexes and altering endocytic trafficking.
In the A-549 cellular context, loss of DNMBP likely reduces junctional Cdc42 activity, leading to disorganized F-actin at cell?Ccell interfaces, compromised transepithelial electrical resistance (TEER), and increased paracellular permeability. This genetically disrupted model of epithelial architecture provides a valuable system for dissecting the molecular drivers of lung adenocarcinoma invasion and metastasis, where junctional instability is a hallmark of epithelial?Cmesenchymal transition and tumor dissemination. The polyclonal nature of the knockout further ensures that observed phenotypes reflect a pooled loss-of-function effect, minimizing clonal bias.
Researchers can employ DNMBP Knockout A-549 Polyclonal Cells for a variety of applications, including immunofluorescence staining of tight junction markers (ZO-1, occludin) and adherens junction proteins (E-cadherin, ??-catenin), phalloidin-based actin cytoskeleton visualization, TEER measurements, and transwell migration and invasion assays. The polyclonal knockout population is also well-suited for drug screening campaigns targeting junction stabilization or for investigating the impact of DNMBP loss on endocytic processes and Cdc42 signaling dynamics. For further information, please contact Ascent Research.
