The KCNK3 Knockout UM-UC-3 Polyclonal Cells product provides a CRISPR/Cas9-edited polyclonal knockout cell population targeting the KCNK3 gene in the UM-UC-3 human bladder cancer cell line. This polyclonal configuration avoids the bias of single-cell cloning and supports robust, population-level analyses of TASK-1 potassium channel function, making it a versatile loss-of-function model for cancer-relevant ion channel studies.
The UM-UC-3 cell line is a well-established model of human bladder transitional cell carcinoma, originally derived from a male patient. It displays epithelial morphology and retains tumorigenic properties, widely utilized in bladder cancer research to explore molecular mechanisms of tumor progression, drug sensitivity, and signal transduction pathways.
KCNK3 encodes TASK-1 (TWIK-related acid-sensitive K+ channel 1), a member of the two-pore domain potassium channel family that mediates background potassium currents critical for resting membrane potential. TASK-1 is exquisitely pH-sensitive, activated by extracellular alkalosis and inhibited by acidosis, linking cellular excitability to metabolic cues. Upstream, channel activity is regulated by angiotensin II, endothelin-1, and protein kinase C (PKC). Crucially, TASK-1 engages in protein interactions with 14-3-3 for trafficking, SUMO1 for silencing, and the p11/annexin A2 light chain and syntaxin-1A for surface expression. Downstream, KCNK3 modulates potassium efflux, membrane potential, and the ERK1/2 signaling cascade, ultimately influencing apoptotic mediators caspase-3 and cell cycle regulators p21 and p27. This positions KCNK3 at a nexus integrating pH sensing, MAPK/ERK signaling, and apoptosis, with implications in pulmonary arterial hypertension, bladder cancer, atrial fibrillation, and neurological disorders.
In UM-UC-3 bladder cancer cells, disruption of KCNK3 abrogates TASK-1-mediated currents, leading to altered membrane potential and impaired responsiveness to extracellular acidification??a hallmark of the tumor microenvironment. This knockout is expected to shift the balance of pro-apoptotic and survival signals, as evidenced by the interconnected roles of ERK1/2, caspase-3, p21, and p27, potentially enhancing proliferation, migration, and chemoresistance. The model thus permits detailed dissection of potassium channel contributions to bladder cancer pathophysiology.
The KCNK3 Knockout UM-UC-3 Polyclonal Cells support a wide array of experimental approaches. Users can perform electrophysiological patch-clamp recordings to confirm loss of TASK-1 currents, pH sensitivity assays to assess cellular responses, and molecular validation via Western blotting and RT-qPCR. Functional assays include apoptosis detection (TUNEL, caspase-3 activity), proliferation measurement (MTS, BrdU), and migration/invasion studies (Boyden chamber). The cells are also suitable for drug sensitivity testing with potassium channel modulators and for transcriptomic profiling by RNA-seq. Key research applications encompass investigation of ion channel roles in bladder cancer, TASK-1-mediated pH sensing in the tumor microenvironment, drug target validation for pulmonary hypertension, and screening of novel ion channel modulators. For additional product details or technical support, please contact Ascent Research.
