Snx1 Knockout RAW 264.7 Cell Line

The Snx1 Knockout RAW 264.7 Cell Line is a CRISPR/Cas9-edited knockout cell line derived from the mouse macrophage cell line RAW 264.7. This loss-of-function model features targeted disruption of the Snx1 gene, which encodes sorting nexin 1, a pivotal component of the endosomal retromer complex. The cell line serves as a valuable tool for dissecting endosomal trafficking and receptor recycling mechanisms in a macrophage context. Applications extend to studying the cellular consequences of impaired retromer function, including altered innate immune signaling and phagocytic capacity, without introducing overexpression artifacts.

The host cell line, RAW 264.7, is an Abelson murine leukemia virus-induced tumor-derived macrophage line widely employed in immunology and cell biology. It exhibits robust phagocytic activity, responds to toll-like receptor ligands, and secretes inflammatory mediators, making it a standard model for innate immunity and inflammation. The adherent cells retain key macrophage characteristics, such as expression of Fc receptors and production of cytokines like TNF-?? and IL-6 upon activation. This background provides a physiologically relevant platform to evaluate the role of intracellular sorting pathways in primary macrophage functions.

Snx1 operates as a core subunit of the retromer complex, interacting directly with Vps26, Vps29, and Vps35 to mediate the retrieval of internalized transmembrane cargo from early endosomes back to the trans-Golgi network. Among its critical clients are the cation-independent mannose 6-phosphate receptor (CI-M6PR), the divalent metal transporter 1 (DMT1), and signaling receptors such as EGFR and the WNT receptor Frizzled. By preventing lysosomal degradation of these receptors, Snx1 sustains continuous signaling downstream of EGFR and WNT, influencing the MAPK and AKT cascades. Upstream activation of these pathways by growth factors, cytokines, and TLR ligands triggers dynamic assembly of the retromer complex, positioning Snx1 at the intersection of endocytic sorting and signal transduction. Additional SNX-BAR proteins, including SNX2, SNX5, and SNX6, collaborate with Snx1 to deform the endosomal membrane and facilitate cargo packaging, underscoring the multilayered regulation of this sorting machinery.

In RAW 264.7 macrophages, Snx1 disruption profoundly alters the endosomal landscape, leading to mistrafficking of receptors involved in phagocytosis and inflammatory responses. Aberrant surface expression of EGFR and TLR4, for example, skews downstream signaling to the MAPK and AKT pathways, potentially altering cytokine profiles and phagocytic efficiency. This model thus captures key aspects of immune dysregulation observed in pathologies such as chronic inflammation, tumor-associated macrophage reprogramming, and neurodegenerative disorders like Alzheimer’s and Parkinson’s disease, where retromer dysfunction has been implicated. By introducing a stable Snx1 loss-of-function background, the cell line enables dissection of the specific contributions of endosomal sorting to macrophage-mediated innate immunity.

The Snx1 Knockout RAW 264.7 Cell Line supports a wide range of experimental workflows. Western blotting and co-immunoprecipitation can verify disruption of retromer assembly and interaction with Vps35, while immunofluorescence and confocal microscopy allow visualization of endosomal markers (EEA1, LAMP1) and receptor co-localization. Functional assays include quantitative phagocytosis measurements, ELISA-based cytokine secretion profiling, and RT-qPCR analysis of inflammatory gene expression. Flow cytometry enables monitoring of TLR4 and EGFR surface levels, and RNA-seq can capture transcriptomic shifts resulting from altered signaling. These applications make the line ideal for investigating retromer-mediated WNT regulation, EGFR recycling, and protein sorting defects linked to neurodegenerative disease models. For ordering and technical inquiries, please contact Ascent Research.