The DUSP18 Knockout HeLa Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the human HeLa cervical adenocarcinoma line, offering a loss-of-function model for the dual-specificity phosphatase DUSP18. Created through CRISPR/Cas9-mediated gene disruption in bulk, the polyclonal format preserves a diverse array of editing events, avoiding the selection bias of clonal isolates and providing a robust tool for analyzing DUSP18 deficiency in a heterogeneous cellular context.
HeLa cells are an adherent epithelial line originating from a cervical adenocarcinoma, hosting integrated HPV18 sequences that drive expression of the viral oncoproteins E6 and E7. These proteins target p53 and pRb for degradation, respectively, abrogating key tumor suppressors and resulting in deregulated proliferation and apoptosis resistance. This well-characterized background underpins the line??s widespread use in cancer research, signal transduction studies, and drug screening.
DUSP18 is a dual-specificity phosphatase that inactivates JNK1/2/3 and p38??/?? by dephosphorylating their activation-loop TXY motifs. It is induced by stimuli such as LPS, TNF??, and IL-1?? and functions as a negative feedback regulator of stress-activated MAPK cascades, which involve upstream kinases MEKK1, ASK1, MKK4/7, and MKK3/6. By suppressing JNK and p38 activity, DUSP18 reduces phosphorylation of downstream transcription factors c-Jun and ATF2 and the kinase MAPKAPK2, thereby modulating AP-1-dependent transcription and dampening innate immune and inflammatory responses, including those mediated by Toll-like receptor pathways.
In HeLa cells, where p53 and pRb are inactivated, DUSP18 knockout removes a critical negative constraint on JNK/p38 pathways, potentially enhancing stress-induced apoptosis or driving proliferation and survival depending on the context. The polyclonal knockout population more accurately reflects tumor cell heterogeneity than clonal derivatives. This model enables dissection of crosstalk between HPV oncoproteins and stress kinases and can be used to study chemoresistance and migration phenotypes associated with cervical cancer.
Typical applications include western blotting for phospho-JNK and phospho-p38, RT-qPCR analysis of c-Jun and ATF2, and luciferase reporter assays to measure AP-1 activity. Functional assays such as Annexin V apoptosis detection, MTT viability tests, and transwell migration studies allow comprehensive phenotypic profiling. These cells support mechanistic studies of MAPK signal transduction, high-throughput screening for pathway modulators, and translational research in cancer, inflammatory disorders, and autoimmune diseases. For further information or technical support, please contact Ascent Research.
