Electroneutral sodium and chloride ion cotransporter. In kidney distal convoluted tubules, key mediator of sodium and chloride reabsorption (PubMed:21613606, PubMed:22009145). Receptor for the pro-inflammatory cytokine IL18. Contributes to IL18-induced cytokine production, including IFNG, IL6, IL18 and CCL2. May act either independently of IL18R1, or in a complex with IL18R1 (By similarity). Activated by WNK3. Interacts with KLHL3 (PubMed:22406640). Interacts with IL18R1; this interaction is increased by IL18 treatment (By similarity). Predominantly expressed in the kidney (at protein level) (PubMed:29993276, PubMed:8812482). Localizes to the distal convoluted tubules (at protein level)(PubMed:29993276). Not detected in normal aorta, but abundantly expressed in fatty streaks and advanced atherosclerotic lesions (at protein level) (PubMed:26099046). Ubiquitinated; ubiquitination is essential for regulation of endocytosis. The BCR(KLHL3) complex was initially identified as a candidate ubiquitin ligase for SLC12A3 (PubMed:22406640). However, it was later shown that it is not the case. Phosphorylated in response to IL18. The disease is caused by variants affecting the gene represented in this entry. Target of thiazide diuretics used in the treatment of high blood pressure. Belongs to the SLC12A transporter family.