SLC9A3 Knockout Cell Line (HCT 116)

The choice depends on whether you are studying SLC9A3 (NHE3)'s role in sodium-hydrogen exchange and intestinal/renal salt and water absorption, or its emerging functions in inflammatory bowel disease and tenapanor pharmacology. The Knockout line is the standard tool for asking whether NHE3 is required for these processes — NHE3 is the principal apical Na+/H+ exchanger in intestinal epithelium and renal proximal tubule. Overexpression is useful for studying NHE3 regulation by trafficking and post-translational modifications. For intestinal transport research, the EDITGENE SLC9A3 Knockout in HCT 116 is relevant — HCT 116, while a cancer line, retains some intestinal epithelial features and supports NHE3 functional studies. The line is particularly valuable as a genetic specificity control for tenapanor (NHE3 inhibitor approved for IBS-C and CKD-associated hyperphosphatemia). Rescue with wild-type or trafficking-deficient NHE3 enables regulatory mechanism studies.

Primary applications: • Na+/H+ exchange activity: BCECF-based intracellular pH measurement following ammonium chloride pulse or hypertonic challenge to quantify NHE3-dependent pH recovery. • Tenapanor specificity: critical genetic control for tenapanor (NHE3 inhibitor) on-target activity testing in intestinal epithelial contexts. • NHE3 trafficking studies: surface biotinylation and imaging-based analysis of NHE3 regulation by NHERF proteins and trafficking machinery. • Sodium absorption studies: short-circuit current or transepithelial sodium absorption measurements where applicable. EDITGENE recommends this model for researchers investigating Na+/H+ exchanger biology, intestinal salt and water absorption, and NHE3-targeted therapeutic development.

Yes. NHE3 rescue experiments require attention to apical targeting and regulatory complexity: • Construct design: use a codon-modified SLC9A3 sequence with a C-terminal cytoplasmic tag (FLAG, HA). NHE3 has 12 transmembrane domains and a large cytoplasmic regulatory C-terminus that contains NHERF-binding motifs. • Regulatory mutant rescue: NHERF-binding-deficient mutations or specific phosphorylation site mutations (S552A, S605A) enable dissection of regulatory inputs. • Trafficking-deficient rescue: cytoplasmic tail mutations affecting trafficking machinery interactions test apical surface delivery requirements. • Functional readout: rescue should restore Na+/H+ exchange activity measured by BCECF-based intracellular pH recovery assays. HCT 116 transduces efficiently with lentivirus; the MSI-high colorectal cancer background should be considered when interpreting epithelial transport studies.