Lgr5 Knockout MC3T3-E1 Cell Line

This product is a CRISPR/Cas9-edited knockout cell line of the Lgr5 gene in the Mus musculus MC3T3-E1 osteoblast precursor cell line. The model features targeted disruption of the Lgr5 locus, enabling loss-of-function analysis in a mesenchymal cell context. The MC3T3-E1 parental line is a well-established model for osteogenic differentiation, making this knockout line a valuable tool for dissecting the role of Lgr5 in bone cell biology.

The MC3T3-E1 cell line was originally derived from neonatal C57BL/6 mouse calvaria and displays a preosteoblast phenotype. Under defined culture conditions supplemented with ascorbic acid and ??-glycerophosphate, these cells undergo a temporal sequence of proliferation, matrix maturation, and mineralization, recapitulating key aspects of osteoblast differentiation. This well-characterized differentiation capacity makes the host line particularly suitable for studying factors that influence osteogenic commitment and bone formation.

Lgr5 encodes a leucine-rich repeat-containing G-protein-coupled receptor that functions as a receptor for R-spondin ligands (RSPO1?C4). Upon R-spondin binding, LGR5 cooperates with LGR4 and Frizzled/LRP5/6 co-receptors to promote membrane clearance of the ubiquitin ligases RNF43 and ZNRF3, which normally target Wnt receptors for degradation. This event stabilizes ??-catenin by inhibiting GSK3??, leading to ??-catenin accumulation and enhanced TCF/LEF-mediated transcription. Key downstream targets include Axin2, c-Myc, cyclin D1, and stem cell maintenance genes such as Sox9 and Bmi1. Thus, Lgr5 functions as a critical amplifier of Wnt/??-catenin signaling and is a well-established marker of adult stem cell populations in various tissues.

In the context of osteoblast biology, Lgr5 expression and Wnt signaling contribute to the regulation of osteogenic differentiation and bone mass. Perturbation of the Lgr5 axis in MC3T3-E1 cells provides a defined system to interrogate how R-spondin-mediated enhancement of Wnt signaling affects osteoblast precursor proliferation, differentiation, and function. This knockout model is therefore relevant for investigating pathways underlying skeletal dysplasias, osteoporosis, and the molecular control of bone formation.

Researchers can employ this cell line in a variety of experimental settings, including quantitative analysis of Wnt target gene expression by RT-qPCR (e.g., Axin2, c-Myc), assessment of ??-catenin levels via Western blot or immunofluorescence, and functional Wnt reporter assays such as TOPFlash/FOPFlash. The line is also suitable for phenotypic assays such as alizarin red staining to monitor mineralization, MTT-based proliferation assays, and transcriptomic profiling using RNA-seq. Beyond osteogenesis, Lgr5??s role as a stem cell marker makes this knockout a useful model for colorectal cancer research and drug screening campaigns aimed at identifying Wnt pathway modulators. For additional technical details or customized support, please contact Ascent Research.