The GRK2 Knockout HEK293T Polyclonal Cells are a CRISPR/Cas9-mediated loss-of-function human cell population designed for targeted disruption of the GRK2 gene. This polyclonal knockout model eliminates endogenous GRK2 expression, allowing researchers to dissect GRK2-dependent signaling mechanisms in a genetically tractable HEK293T background. The polyclonal nature avoids clonal artifacts and provides a representative heterogeneous population for robust, reproducible experiments.
The HEK293T host cell line is a derivative of the widely used HEK293 human embryonic kidney cell line, engineered to stably express the SV40 large T antigen. This genetic modification promotes high-copy episomal replication of plasmids containing the SV40 origin, making HEK293T cells exceptionally efficient for recombinant protein expression, viral vector production, and transient transfection studies. Their epithelial origin and robust growth characteristics further support versatile experimental applications in cell signaling and drug discovery.
GRK2 encodes a serine/threonine kinase belonging to the GRK family that selectively phosphorylates agonist-occupied G protein-coupled receptors (GPCRs). Phosphorylation triggers recruitment of ??-arrestin, leading to receptor desensitization, clathrin-mediated internalization, and ??-arrestin-dependent activation of downstream effectors such as ERK1/2. Beyond GPCR regulation, GRK2 phosphorylates non-receptor substrates including IRS1 and HDAC5, and interacts with G?¦? subunits, PIP2, caveolin, calmodulin, PKC, Src, MEK, and HSP90. Upstream, GRK2 is activated by GPCR agonists, insulin, ??- and ??-adrenergic stimulation, PI3K, and Src. Downstream, it modulates AKT inhibition, p38 MAPK, NF-??B, and insulin receptor signaling. GRK2 is thus a central node in pathways governing cardiac contractility, inflammatory responses, insulin sensitivity, and cell migration.
In HEK293T cells, GRK2 knockout uncouples GPCR signaling from negative feedback regulation, enabling detailed kinetic analyses of receptor internalization and ??-arrestin recruitment. The absence of GRK2 also alters basal and stimulated ERK and AKT phosphorylation, providing a clean background to delineate crosstalk between GPCR and receptor tyrosine kinase pathways. Furthermore, HEK293T cells express a repertoire of endogenous GPCRs and signaling components, making this knockout model directly relevant for chemokine, adrenergic, and insulin signaling studies.
Key applications include high-content GPCR internalization assays, BRET/FRET-based ??-arrestin translocation measurements, phospho-ERK ELISAs, calcium flux and cAMP accumulation assays, and co-immunoprecipitation of signaling complexes. The polyclonal knockout cells are also suited for drug screening to identify GRK2-dependent pharmacological responses in cardiovascular, metabolic, and inflammatory disease contexts. For additional information and assay compatibility, please contact Ascent Research.
