The INPP5F Knockout HT29 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the HT29 human colorectal adenocarcinoma line. This gene-disrupted model provides a loss-of-function system for studying the phosphoinositide 5-phosphatase INPP5F. The polyclonal nature ensures a heterogeneous genetic background, recapitulating the diversity of gene editing outcomes observed in pooled cellular populations, and is particularly suited for experiments that do not require clonal homogeneity.
The HT29 cell line originates from a primary human colorectal adenocarcinoma and displays adherent epithelial morphology, retaining key characteristics of intestinal epithelial cells. It is widely employed as a model for colon carcinoma biology, including studies of epithelial barrier function, differentiation, and oncogenic signaling. HT29 cells carry endogenous alterations in pathways such as MAPK and PI3K/AKT, which render them a relevant background for investigating tumor-suppressive phosphatases.
INPP5F encodes a phosphoinositide 5-phosphatase that hydrolyzes PIP3 to PI(3,4)P2, downregulating PI3K/AKT signaling. This action reduces membrane recruitment and activation of AKT and PDK1, thereby dampening effectors such as mTORC1, GSK3??, and FOXO transcription factors. INPP5F localizes to early endosomes via interaction with Rab5 GTPase and cooperates with APPL1 to coordinate signal termination. Growth factor stimulation (EGF, insulin) activates PI3K, generating PIP3, which serves as both substrate and feedback node. Together with PTEN, INPP5F buffers AKT activity, controlling cell proliferation, survival, and migration.
In the HT29 colorectal cancer context, loss of INPP5F is predicted to sustain PIP3 accumulation, leading to hyperactivation of AKT and its downstream targets, including GSK3?? inactivation and FOXO3a nuclear exclusion. This shift promotes cell proliferation, survival, and invasive potential, mirroring key hallmarks of colorectal carcinogenesis. Because HT29 cells harbor oncogenic drivers that already impinge on PI3K/AKT signaling, the INPP5F knockout model enables dissection of the specific tumor-suppressive role of this phosphatase and its interplay with parallel oncogenic pathways. Additionally, the model can be utilized to assess the impact of INPP5F loss on endocytic recycling of receptor tyrosine kinases such as EGFR, further contributing to sustained signaling.
Researchers can employ these cells for Western blotting of phospho-AKT (Ser473), total AKT, phospho-GSK3??, and FOXO3a; quantitative PIP3 lipid profiling; and co-immunoprecipitation of INPP5F with Rab5. Phenotypic assays include MTT/BrdU proliferation, Annexin V apoptosis, and Boyden chamber migration/invasion tests. The model is also suitable for screening PI3K pathway inhibitors (e.g., AKT or PI3K inhibitors) to study drug sensitivity. For further technical inquiries, please contact Ascent Research.
