Human SERPING1 Stable Cell Line - A549

The SERPING1 gene encodes a C1 repressor protein, a key molecular "brake" in multiple systemic cascade reactions. In addition to its role in regulating the complement and contact systems, C1-INH has been shown to interact with coagulation and fibrinolysis pathways, thereby modulating vascular permeability and systemic inflammatory responses. Structurally, this protein consists of a highly glycosylated N-terminal domain and a conserved serine protease inhibitor (serpin) domain containing a reaction center loop (RCL). N-terminal glycosylation is crucial for the protein''s stability and its ability to bind to endothelial cell surface and extracellular matrix components. In lung biology, SERPING1 expression is essential for protecting vulnerable alveolar structures from damage caused by uncontrolled protease activity during infection or acute lung injury. Recent genomic studies have shown that low levels of lung SERPING1 are a predictive biomarker for rapid disease progression and severe respiratory failure in various inflammatory environments.

A549, a human alveolar epithelial cell line that retains the metabolic and secretory characteristics of type II alveolar cells, is an ideal host for studying the production of protective serine protease inhibitors (serpin) in the lung. This cell line, by stably expressing human SERPING1, enables researchers to map the molecular interactions between C1-INH and the lung microenvironment with high precision. This product is widely used for high-throughput screening of compounds that can enhance the endogenous expression or functional activity of C1-INH. Furthermore, the SERPING1-A549 cell line can serve as a reliable platform for studying how complement inhibitors alleviate viral or bacterial pathogen-induced cytokine storms. The stability of gene expression in this model ensures the ability to monitor the effects of SERPING1 on cell surface protein hydrolysis and barrier integrity during long-term culture.