The EFEMP1 Knockout HEK293T Polyclonal Cells constitute a CRISPR/Cas9-edited polyclonal knockout cell population that disrupts the EFEMP1 gene in the human embryonic kidney cell line HEK293T. This loss-of-function model enables robust investigation of fibulin-3, the encoded extracellular matrix glycoprotein, without requiring clonal isolation. The polyclonal format ensures reproducibility across studies, supporting functional analyses in cell adhesion, migration, proliferation, and tumor suppression. Researchers can utilize this tool to dissect EFEMP1-mediated pathways in a highly transfectable host.
HEK293T is a derivative of the HEK293 cell line, stably expressing the SV40 large T antigen. This feature confers high transfection efficiency and permits episomal replication of plasmids with SV40 origins, making the line a standard platform for recombinant protein expression and lentivirus production. Its epithelial origin and experimental tractability provide an ideal context for studying secreted ECM proteins like fibulin-3, which plays critical roles in matrix organization and signaling.
EFEMP1 encodes fibulin-3, a secreted glycoprotein that modulates integrin-mediated cell adhesion via direct binding to ??v??3 and ??v??5 receptors and interactions with fibronectin and tropoelastin. Downstream, it engages FAK/Src signaling and inhibits matrix metalloproteinases by complexing with TIMP3, thereby regulating ECM integrity. Fibulin-3 acts as a tumor suppressor by attenuating angiogenesis and TGF-?? activity, with loss promoting MMP2 and VEGF expression. Transcription is induced by TGF-??, EGR1, and SP1, while promoter hypermethylation silences EFEMP1 in cancers. These mechanisms underline its importance in retinal homeostasis and cancer progression.
In HEK293T cells, EFEMP1 knockout provides a clean genetic model to explore fibulin-3??s role in TGF-?? responsiveness, integrin signaling, and ECM remodelling without tissue-specific noise. The high transfectability of HEK293T facilitates rescue experiments and pathway dissection. This system is particularly valuable for screening regulators of EFEMP1 expression and for validating putative downstream targets in an epithelial context relevant to both basic ECM biology and oncogenic transformation.
Typical applications include confirming knockout by RT-qPCR and Western blotting, profiling transcriptomic changes via RNA-seq, and assessing cell adhesion and migration with functional assays. Secreted fibulin-3 can be quantified by ELISA, and ECM organization visualized by immunofluorescence. Co-immunoprecipitation enables mapping of integrin and TIMP3 interactions. TGF-?? reporter assays and drug sensitivity screens further support mechanistic and translational studies in cancer biology and retinal disease modeling, such as age-related macular degeneration. For additional details, contact Ascent Research.
