The KDELR1 Knockout A-549 Polyclonal Cells product comprises a heterogeneous population of human A-549 lung adenocarcinoma epithelial cells that have been subjected to CRISPR/Cas9-mediated gene disruption targeting KDELR1. This polyclonal knockout cell pool provides a biologically relevant loss-of-function model for investigating endoplasmic reticulum (ER)?CGolgi retrograde transport and its downstream effects on cellular homeostasis. By ablating KDELR1 expression across a mixed cell population, the product enables robust functional genomics studies without the clonal artifacts that can arise from single-cell-derived lines.
The parental A-549 cell line originates from a 58-year-old male patient with lung adenocarcinoma and serves as a well-established alveolar epithelial model in cancer research. These adherent epithelial cells retain key characteristics of type II pneumocytes, including the ability to form monolayers and respond to various stress stimuli, making them particularly suitable for examining how ER?CGolgi trafficking perturbations intersect with oncogenic signaling and stress adaptation mechanisms in a clinically relevant lung cancer background.
KDELR1 encodes an endoplasmic reticulum retention receptor that orchestrates the retrieval of escaped ER-resident proteins from the cis-Golgi back to the ER. Mechanistically, KDELR1 recognizes the C-terminal KDEL sequence on cargo proteins and packages them into COPI-coated vesicles, requiring interactions with the COPI coatomer complex, ARF1, and Golgin-84. This positions KDELR1 as a central node in ER proteostasis. Upstream, ER stress sensors ATF6, IRE1??, and PERK regulate its activity, while downstream KDELR1 controls the abundance of ER chaperones such as HSPA5 (BiP) and P4HB, along with ER-associated degradation (ERAD) components. Loss of KDELR1 triggers unresolved ER stress, activating the unfolded protein response (UPR) and transcriptional reprogramming by XBP1 and ATF4.
In the context of A-549 lung adenocarcinoma cells, KDELR1 disruption is expected to provoke chronic ER stress and UPR activation, potentially altering proliferative capacity, migratory behavior, and sensitivity to chemotherapeutic agents. Cancer cells often rely on adaptive UPR signaling for survival under adverse microenvironmental conditions; therefore, this knockout model provides a powerful tool for dissecting the contribution of retrograde trafficking to tumor cell fitness, protein quality control, and stress resilience. By comparing polyclonal knockout pools with parental wild-type cells, researchers can identify ER stress-dependent vulnerabilities specific to lung adenocarcinoma.
Representative applications include monitoring ER stress markers (BiP, CHOP) by western blot and RT-qPCR, visualizing Golgi?CER redistribution with immunofluorescence for GM130 and calnexin, assessing apoptosis and cell cycle via flow cytometry, and evaluating migration and invasion through Transwell assays. The polyclonal knockout cells are well-suited for drug sensitivity profiling with ER stress-inducing agents (tunicamycin, thapsigargin) and for screening modulators of COPI-dependent transport. This model enables systematic study of ER?CGolgi trafficking, UPR signaling, and identification of therapeutic targets in lung cancer. For further details, please contact Ascent Research.
