The GRIPAP1 Knockout Jurkat Polyclonal Cells comprise a CRISPR/Cas9-edited polyclonal population targeting the GRIPAP1 gene in the Jurkat T-lymphocyte line, providing a loss-of-function model for studying GRIPAP1-mediated endosomal trafficking and receptor recycling. The polyclonal format preserves genetic diversity while ensuring robust gene disruption across the pool, suitable for population-based functional assays without clonal selection. This product enables efficient exploration of GRIPAP1 roles in immune cell biology.
The Jurkat cell line, derived from an acute T-cell leukemia patient, serves as a canonical model for T-cell receptor (TCR) signaling, apoptosis, and immune activation. These suspension lymphoblasts exhibit stable proliferation and high transfection efficiency, facilitating CRISPR editing and downstream analyses. Knockout of GRIPAP1 in Jurkat cells allows investigation of its scaffolding functions in a well-characterized T-cell environment.
GRIPAP1 (GRASP-1) is a scaffold protein that directly binds GRIP1 and Rab4, orchestrating endosomal sorting and recycling of cell surface receptors. In neurons, it regulates AMPA receptor (GluA1, GluA2) recycling to synapses, critical for plasticity. GRIPAP1 interacts with syntaxin 4 and kinesin-1, linking it to microtubule-based transport. Upstream, it is regulated by MEF2 and SRF transcription factors, while TCR stimulation may modulate its activity in T cells. Downstream, GRIPAP1 controls Rab4-positive early endosome dynamics and surface receptor expression.
In Jurkat T cells, GRIPAP1 disruption likely impairs TCR and co-receptor recycling, altering immune synapse formation and signaling. Given its association with autism and intellectual disability, this model serves as a comparative tool for neuroimmune shared mechanisms. Altered TCR surface expression and endosomal markers (Rab4, EEA1) can be monitored, along with phosphorylation events like ZAP70 and ERK, connecting endosomal trafficking to lymphocyte function.
Applications include investigating TCR recycling and immune synapse dynamics, endosomal trafficking studies, and drug screens for receptor recycling modulators. Assays such as flow cytometry for CD3/TCR, immunofluorescence for Rab4/EEA1, co-immunoprecipitation of GRIP1/Rab4, phospho-signaling analysis, NFAT/AP-1 reporter assays, and apoptosis assays are supported. For further information, contact Ascent Research.
