The ACTA2 Knockout 143B Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population derived from the human 143B osteosarcoma cell line. This heterogeneous pool carries targeted disruption of the ACTA2 gene, which encodes alpha-smooth muscle actin (??-SMA), resulting in a loss-of-function model. As a polyclonal population, it retains the genetic variability of the parental line while eliminating ACTA2 expression, making it suitable for functional studies without clonal artifacts.
The 143B cell line is a highly aggressive and metastatic osteosarcoma model of mesenchymal origin. Widely employed in cancer research, these cells exhibit rapid proliferation and invasive behavior, offering a robust system to examine tumor progression, metastasis, and interactions with the bone microenvironment. Their mesenchymal phenotype also makes them relevant for investigations into myofibroblast-like differentiation and extracellular matrix remodeling, processes heavily dependent on ??-SMA.
Alpha-smooth muscle actin is a major cytoskeletal protein in smooth muscle, myofibroblasts, and pericytes, where it forms contractile stress fibers and regulates cell contraction, motility, and matrix remodeling. ACTA2 transcription is driven by TGF-??1 signaling through SMAD2/3?CSMAD4 complexes and the transcriptional coactivators MRTFs and SRF. The RhoA-ROCK-LIMK-cofilin pathway modulates actin dynamics, while YAP/TAZ mechanosensing links cytoskeletal tension to gene expression. ??-SMA interacts with myosin, tropomyosin, filamin, ??-actinin, and vinculin to build functional contractile units and focal adhesions, ultimately promoting assembly of extracellular matrix components such as collagen and fibronectin.
In 143B osteosarcoma cells, ACTA2 knockout disrupts stress fiber formation and contractility, impairing TGF-??-induced myofibroblast differentiation and matrix remodeling. Given that osteosarcoma cells can contribute to a reactive stroma, this knockout model enables dissection of ??-SMA??s role in tumor?Cmicroenvironment crosstalk. It facilitates the study of how reduced contractility and matrix deposition affect invasion, metastasis, and mechanotransduction pathways linking TGF-?? and RhoA signaling to cytoskeletal reorganization.
This polyclonal knockout population supports diverse applications, including myofibroblast biology, fibrosis modeling, cancer-associated fibroblast research, and osteosarcoma metastasis studies. Key assays include western blotting and immunofluorescence for ??-SMA and stress fibers, RT-qPCR for fibroblast markers, collagen contraction and migration/invasion assays, TGF-??1 stimulation, RNA-seq, and flow cytometry. It provides a versatile platform for actin cytoskeleton and tumor microenvironment research. For further inquiries, please contact Ascent Research.
