The IPO5 Knockout A-549 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population derived from the A-549 human lung adenocarcinoma cell line, in which the IPO5 gene has been disrupted to generate a loss-of-function model. This product is supplied as a heterogeneous polyclonal pool of cells carrying diverse CRISPR-induced mutations at the IPO5 locus, enabling the study of nuclear transport receptor biology without the clonal selection step. The disruption of IPO5 abrogates importin-5 protein function, providing a versatile tool for investigating aspects of nucleocytoplasmic shuttling and its impact on cellular physiology and disease.
The A-549 host cell line was originally established from the lung adenocarcinoma tissue of a 58-year-old Caucasian male. These adherent epithelial cells display features of type II alveolar epithelial cells, including the presence of lamellar bodies, and are widely recognized as a model system for studying non-small cell lung cancer biology, viral infection (particularly influenza A virus), and drug metabolism. A-549 cells exhibit robust innate immune responses and are permissive to various pathogens, making them a valuable substrate for examining host?Cpathogen interactions and anticancer agent efficacy.
IPO5 encodes importin-5, a member of the importin-?? superfamily, which functions as a nuclear transport receptor that recognizes cargo proteins bearing classical nuclear localization signals (NLS) and mediates their translocation through the nuclear pore complex in a RanGTP-dependent manner. Importin-5 is critically involved in the import of NF-??B p65, histones (H2A, H2B, H3, H4), ribosomal proteins, and viral proteins including influenza nucleoprotein (NP) and HIV integrase. Its activity is regulated by Ran GTPase and requires interaction with importin ?? (the cargo adaptor) and nucleoporins such as NUP50 and NUP62. Consequently, IPO5 disruption impairs nuclear accumulation of NF-??B p65, attenuating NF-??B signaling downstream of I??K and I??B, and disrupts histone delivery, affecting chromatin assembly and cell cycle progression.
In the lung adenocarcinoma context of A-549 cells, loss of IPO5 is particularly significant due to the prominent role of NF-??B signaling in promoting cancer cell survival, proliferation, and inflammation. IPO5 knockout in this model allows researchers to dissect how nuclear transport aberrations contribute to oncogenic phenotypes, such as unchecked growth and resistance to apoptosis. Moreover, since A-549 cells support robust replication of influenza A virus, the polyclonal IPO5 knockout cells provide a platform to examine the reliance of viral lifecycles on host importin-5-mediated nuclear import, facilitating the study of antiviral strategies targeting nuclear transport.
These polyclonal knockout cells enable applications such as western blotting to confirm importin-5 loss, immunofluorescence to examine cargo distribution (e.g., NF-??B p65), nuclear/cytoplasmic fractionation to quantify import defects, and NF-??B luciferase reporter assays to measure signaling. Cell proliferation assays and viral infection assays can assess functional consequences, while RNA-seq and co-immunoprecipitation reveal broader molecular changes. For product details or custom requests, contact Ascent Research.
