Description

The Impdh2 Knockout NIH 3T3 Cell Line is a CRISPR/Cas9-edited knockout cell line derived from the NIH 3T3 mouse embryonic fibroblast line, engineered for loss-of-function studies of inosine monophosphate dehydrogenase 2 (Impdh2). This gene-edited model provides a defined genetic background for investigating Impdh2-dependent processes.

NIH 3T3 cells are contact-inhibited immortalized mouse embryonic fibroblasts commonly used in cancer and signal transduction research. Due to their well-characterized growth properties and responsiveness to oncogenic transformation, they serve as a robust platform for dissecting proliferation and metabolic pathways.

Impdh2 encodes the rate-limiting enzyme in de novo guanine nucleotide biosynthesis, catalyzing the NAD+-dependent oxidation of inosine monophosphate (IMP) to xanthosine monophosphate (XMP). This reaction is essential for maintaining intracellular pools of guanine nucleotides (GMP, GDP, GTP) required for DNA and RNA synthesis. Impdh2 is transcriptionally regulated by MYC, mTORC1, and E2F, and is subject to negative regulation by p53. Its activity directly interacts with GTP and GDP as allosteric regulators and is inhibited by mycophenolic acid, a clinically used immunosuppressant. Downstream, Impdh2 function governs cell cycle progression by controlling the supply of nucleotides for replication. Disruption of Impdh2 therefore depletes guanine nucleotide pools, impairing nucleic acid synthesis and leading to proliferation arrest.

In NIH 3T3 fibroblasts, Impdh2 knockout creates a unique model to interrogate the intersection of nucleotide metabolism with contact inhibition and oncogenic signaling. Given the reliance of rapidly dividing cancer cells on de novo nucleotide synthesis, this knockout line is particularly valuable for studying the metabolic vulnerabilities of transformed cells. It enables precise assessment of how guanine nucleotide depletion influences fibroblast proliferation, survival, and response to oncogenic stimuli.

This engineered cell line is ideal for applications including validation of nucleotide biosynthesis targets, investigation of immunosuppression mechanisms mediated by IMPDH inhibition, and screening of compounds that modulate purine metabolism. Representative assays include cell proliferation and colony formation assays, HPLC-based nucleotide pool quantification, flow cytometric cell cycle analysis, and western blot detection of IMPDH2 protein levels. It supports translational research in cancer and viral infections where host nucleotide synthesis is co-opted. For additional details or inquiries, please contact Ascent Research.