A549-RFP Cells

A549-RFP is a fluorescently labeled derivative of the human A549 lung adenocarcinoma cell line, engineered to constitutively express red fluorescent protein (RFP) for real-time visualization and tracking. The parental A549 line was established from a lung adenocarcinoma derived from an adult donor and exhibits epithelial morphology with adherent growth characteristics. A549 cells retain features of type II alveolar epithelial cells, including expression of cytokeratins and the capacity for surfactant-associated protein production. The introduction of a stable RFP expression cassette enables continuous fluorescence without significantly altering the intrinsic proliferative and metabolic properties of the parental line, making A549-RFP suitable for longitudinal imaging studies.

Functional characterization of A549 cells within large cancer cell panels has demonstrated that cell size, protein content, and protein synthesis rate are positively correlated with cell volume, and that larger cells tend to proliferate more slowly. In comparative analyses, A549 cells are positioned among relatively smaller, faster-proliferating epithelial cancer cell lines, in contrast to larger, more mesenchymal-like cells that display higher vimentin expression and lower E-cadherin levels. These metabolic and phenotypic distinctions are relevant for experimental interpretation, as protein synthesis rates and metabolic fluxes scale with cell size and influence sensitivity to agents targeting proliferation or mTOR-regulated anabolic pathways. The RFP modification preserves the suitability of A549 cells for such metabolic and pharmacologic investigations while enabling direct visualization.

A549-RFP is widely used in co-culture systems, orthotopic and ectopic xenograft models, and invasion or metastasis assays where fluorescent labeling facilitates discrimination of tumor cells from stromal or host components. The stable red fluorescence supports applications including live-cell imaging, high-content screening, flow cytometry-based quantification, and in vivo optical imaging. As a traceable variant of a well-characterized lung adenocarcinoma model, A549-RFP provides a robust platform for studying tumor cell proliferation, epithelial-mesenchymal transition, drug response, and tumor-microenvironment interactions in both in vitro and in vivo settings.