This product comprises a polyclonal population of Ca Ski cells engineered via CRISPR/Cas9-mediated gene disruption to ablate the ACTA2 gene, which encodes alpha-smooth muscle actin (??-SMA). The polyclonal knockout cells offer a robust loss-of-function system for interrogating ??-SMA-dependent functions in a human cervical carcinoma background, allowing researchers to bypass clonal selection biases and study heterogeneous responses.
The Ca Ski cell line was isolated from a cervical squamous cell carcinoma metastasis located in the small intestine and stably retains human papillomavirus type 16 (HPV-16) sequences. These adherent cervical epithelial cells are extensively characterized for modeling HPV-mediated oncogenesis, epithelial-to-mesenchymal transition (EMT), and metastatic dissemination. Endogenous ACTA2 expression is minimal under standard culture conditions but is strongly induced by TGF-??1, making this knockout particularly informative for parsing ??-SMA’s contribution to cytokine-driven phenotypic plasticity.
ACTA2 encodes ??-SMA, a core actin isoform integral to the contractile apparatus of myofibroblasts and smooth muscle cells. Transcriptional activation of ACTA2 is primarily orchestrated by TGF-??1 signaling through the TGFBR1 receptor and canonical SMAD2/3 pathway, which collaborates with the serum response factor (SRF) and its coactivators myocardin and MRTF-A. Once expressed, ??-SMA polymerizes into filamentous actin and engages in direct interactions with myosin, alpha-actinin, tropomyosin, caldesmon, calponin, cofilin, and profilin to generate contractile force. This actomyosin network strengthens focal adhesion complexes, promotes extracellular matrix (ECM) deposition, and transduces mechanical cues. Consequently, ACTA2 knockout uncouples TGF-?? signaling from downstream cytoskeletal remodeling, providing a clean system to dissect ??-SMA-mediated cellular mechanics.
In the Ca Ski cervical cancer background, loss of ??-SMA abrogates TGF-??-induced myofibroblast-like differentiation, preventing stress fiber assembly and impairing contractile function as measured by collagen gel contraction. Migration and invasion are significantly attenuated due to disrupted focal adhesion turnover and reduced cell body translocation. This model thus highlights the critical role of ??-SMA in conferring mesenchymal and pro-migratory capabilities to carcinoma cells. Moreover, it allows discrimination between ??-SMA-dependent effects and other TGF-??-triggered responses, such as SMAD-independent pathways or EMT transcription factor activation.
This polyclonal ACTA2 knockout model is ideally suited for a range of experimental approaches, including Western blotting for myofibroblast markers, immunofluorescence microscopy of F-actin structures, and quantitative migration/invasion assays. Functional readouts such as collagen gel contraction and live-cell imaging of contractility provide direct measures of ??-SMA activity. Molecular characterization can be performed via RT-qPCR for endogenous ??-SMA target genes, RNA-seq for global transcriptome analysis, and co-immunoprecipitation to map ??-SMA interactomes. Signaling studies may include phospho-SMAD2/3 analysis and TGF-??1 dose-response experiments. Additionally, these cells serve as a platform for high-throughput screening of compounds that antagonize TGF-?¨C??-SMA signaling, aiming to identify novel anti-fibrotic or anti-metastatic agents. For further technical inquiries or customized applications, please contact Ascent Research.
