The ITPR1 Knockout A-549 Polyclonal Cells constitute a CRISPR/Cas9-edited polyclonal knockout cell population designed to disrupt the human ITPR1 gene, which encodes the type 1 inositol 1,4,5-trisphosphate receptor (IP3R1). This loss-of-function model provides a powerful tool for dissecting the role of IP3-gated calcium release in cellular signaling, without assuming monoclonal origin or complete biallelic knockout. The polyclonal format preserves genetic heterogeneity while enabling robust gene-level disruption, making it suitable for population-based functional studies where clonal variation is not desirable.
The parental A-549 cell line is a well-characterized human lung adenocarcinoma epithelial model derived from a 58-year-old Caucasian male. Exhibiting epithelial morphology, A-549 cells serve as a representative system for alveolar type II epithelium and are extensively utilized in lung cancer biology, respiratory disease research, and drug discovery. Their broad use in cancer cell biology makes them an ideal host for probing oncogenic signaling pathways.
ITPR1 functions as a ligand-gated ion channel residing in the endoplasmic reticulum membrane. Upon activation of upstream G-protein coupled receptors (GPCRs) or receptor tyrosine kinases (RTKs), phospholipase C (PLC) hydrolyzes PIP2 to generate the second messenger IP3, which binds ITPR1 and triggers Ca2+ release from ER stores. The resulting elevation of cytosolic calcium activates downstream effectors including calmodulin, calcineurin, the NFAT family of transcription factors, and Ca2+/calmodulin-dependent kinase II (CaMKII). Key interacting partners such as FKBP12 and IRBIT modulate channel gating, while regulatory inputs from kinases like PKA and PKC fine-tune ITPR1 activity. The channel thus orchestrates a wide spectrum of calcium-dependent processes, including gene expression, metabolism, and apoptosis.
In the A-549 lung adenocarcinoma context, ITPR1-mediated calcium signaling influences cancer cell proliferation, migration, and survival. Dysregulation of this pathway has been associated with tumor progression and drug resistance, underscoring the need for precise genetic models. This knockout polyclonal population enables researchers to investigate how loss of ITPR1 impacts A-549 cell behavior, linking calcium dynamics to malignancy-associated phenotypes. Beyond oncology, ITPR1 mutations are implicated in spinocerebellar ataxia type 15/16 and Gillespie syndrome, expanding the model??s utility to neurodegenerative disease research.
Typical research applications include calcium imaging with Fluo-4 to monitor store-operated and receptor-evoked fluxes, IP3-induced calcium release assays, co-immunoprecipitation of ITPR1 interactors such calmodulin or Homer proteins, and functional assays for apoptosis (Annexin V), proliferation (MTT), and migration. The knockout cells are also applicable in high-throughput screening for ITPR1 modulators and phospho-signaling analysis of downstream targets like CaMKII. For additional information or ordering, please contact Ascent Research.
