CCN1 Knockout HaCaT Cell Line

The CCN1 Knockout HaCaT Cell Line is a CRISPR/Cas9-edited knockout cell line derived from the HaCaT immortalized keratinocyte line. It incorporates targeted disruption of the CCN1 gene, which encodes the matricellular protein CCN1 (also known as CYR61), establishing a stable loss-of-function model for studying CCN1-dependent cellular processes. This cell line provides a renewable and genetically defined platform to investigate CCN1 functions in epidermal biology, eliminating the variability and transient effects associated with siRNA or pharmacological inhibition approaches.

The HaCaT cell line is a spontaneously immortalized human keratinocyte line originally isolated from adult abdominal skin. These cells retain the capacity for normal epidermal differentiation and form a stratified epithelium in organotypic cultures, making them a widely accepted model for studying keratinocyte biology, skin barrier formation, and epithelial integrity. Their non-tumorigenic phenotype and responsiveness to physiological stimuli render them particularly suitable for dissecting molecular mechanisms underlying skin homeostasis and disease.

CCN1 is a secreted cysteine-rich matricellular protein that functions as a dynamic mediator of cell?Cmatrix communication. It interacts with integrin receptors, predominantly ??v??3, ??v??5, and ??6??1, as well as heparan sulfate proteoglycans, to modulate adhesion, migration, proliferation, and angiogenesis. Upstream, CCN1 expression is induced by growth factors such as EGF, FGF2, PDGF, and TGF-??, along with cytokines like TNF-??, hypoxia via HIF-1??, mechanical stress, and estrogen. Downstream, CCN1 orchestrates signaling through focal adhesion kinase (FAK)/Src and extracellular signal-regulated kinase (ERK) cascades, the AKT pathway, and ??-catenin/NF-??B transcriptional programs. These pathways converge to regulate the expression of target genes including cyclin D1, VEGF, matrix metalloproteinases (MMPs), IL-6, and COX-2. Consequently, disruption of CCN1 in this knockout model impairs integrin-mediated signaling, leading to attenuated activation of FAK, ERK, and AKT and subsequent alterations in cell behavior.

In the context of HaCaT keratinocytes, CCN1 plays a pivotal role in coordinating adhesion-dependent signaling that governs migration, proliferation, and differentiation. Loss of CCN1 disrupts these processes, providing a powerful tool to elucidate how matricellular cues influence epidermal physiology. This model is particularly relevant for dissecting the molecular underpinnings of wound healing, where CCN1 is rapidly upregulated to promote re-epithelialization and angiogenesis, as well as pathological states such as psoriasis, skin cancer, and fibrosis, where aberrant CCN1 expression contributes to disease progression.

This cell line supports a broad range of experimental applications in keratinocyte biology, integrin signaling, and drug discovery. Researchers can utilize it in scratch wound assays to assess migration, proliferation assays, cell adhesion studies, and immunofluorescence analysis of signaling components. Detailed phospho-signaling analyses by western blotting or ELISA can interrogate FAK, ERK, and AKT pathway activation, while RT-qPCR enables quantitative gene expression profiling. The model is also amenable to high-throughput screening for compounds that modulate integrin-dependent pathways or restore normal keratinocyte function. For further information, please contact Ascent Research.