The ACE2 Knockout A-549 Polyclonal Cells represent a CRISPR/Cas9-mediated gene-disrupted population derived from human A-549 lung adenocarcinoma epithelial cells. This polyclonal knockout pool provides a heterogeneous loss-of-function model for studying ACE2-dependent processes, abolishing endogenous ACE2 expression and its associated enzymatic and receptor functions. As a targeted knockout product, it enables investigation of ACE2 biology without the variability of transient suppression methods, suitable for stable genetic dissection in pulmonary epithelial contexts.
The A-549 host cell line is a well-characterized model of human alveolar type II epithelium, originally isolated from a lung adenocarcinoma. These hypotriploid adherent cells exhibit epithelial morphology and retain key features of distal lung epithelium, including expression of surfactant proteins and receptors relevant to respiratory infection. The A-549 background is extensively employed in cancer biology, respiratory disease modeling, and host-pathogen interaction studies, making it a physiologically relevant platform for ACE2 loss-of-function experiments.
ACE2 encodes a carboxypeptidase that converts the pro-inflammatory vasoconstrictor angiotensin II into the protective angiotensin-(1-7), which signals through the Mas receptor to promote nitric oxide production, vasodilation, and anti-fibrotic effects. ACE2 also serves as the primary receptor for SARS-CoV and SARS-CoV-2 Spike protein, with viral entry facilitated by additional host factors including B0AT1 (SLC6A19) and integrins. The enzyme is transcriptionally regulated by upstream factors such as Interferon-??, IL-4, HNF1??, STAT3, and the miR-200 family. ACE2 thus functions as a counter-regulatory node in the renin-angiotensin system, opposing the ACE/Ang II/AT1 receptor axis; its disruption eliminates both the catalytic generation of angiotensin-(1-7) and the cell-surface platform for coronavirus entry.
In A-549 cells, endogenous ACE2 expression links alveolar epithelial biology to systemic angiotensin signaling and respiratory virus susceptibility. Knockout of ACE2 in this model system dismantles the protective angiotensin-(1-7)/Mas receptor cascade and renders cells resistant to Spike-mediated entry, providing a clean genetic background to dissect ACE2-dependent contributions to inflammation, fibrosis, and viral pathogenesis. This is particularly relevant for understanding COVID-19-associated acute respiratory distress syndrome, where alveolar type II cells are key targets of viral injury and dysregulated angiotensin signaling.
This polyclonal knockout product is optimized for diverse applications, including SARS-CoV-2 pseudovirus entry assays to confirm receptor dependency, angiotensin processing activity assays to measure loss of catalytic function, and RT-qPCR or Western blot analysis to validate gene disruption. Researchers studying host-pathogen interactions, lung cancer biology, or angiotensin pathway signaling will find these cells useful for mechanistic and drug-screening studies in a human alveolar epithelial context. For additional technical details or ordering information, please contact Ascent Research.
