SLC5A8

SLC5A8 has been shown to transport iodide by a passive mechanism (Rodriguez et al., 2002 [PubMed 12107270]) and monocarboxylates and short-chain fatty acids by a sodium-coupled mechanism (Gopal et al., 2004 [PubMed 15322102]). In kidney, SLC5A8 functions as a high-affinity sodium-coupled lactate transporter involved in reabsorption of lactate and maintenance of blood lactate levels (Thangaraju et al., 2006 [PubMed 16873376]).

Full Name

Solute Carrier Family 5 Member 8

Function

Acts as an electrogenic sodium (Na+) and chloride (Cl-)-dependent sodium-coupled solute transporter, including transport of monocarboxylates (short-chain fatty acids including L-lactate, D-lactate, pyruvate, acetate, propionate, valerate and butyrate), lactate, mocarboxylate drugs (nicotinate, benzoate, salicylate and 5-aminosalicylate) and ketone bodies (beta-D-hydroxybutyrate, acetoacetate and alpha-ketoisocaproate), with a Na+:substrate stoichiometry of between 4:1 and 2:1. Catalyzes passive carrier mediated diffusion of iodide. Mediates iodide transport from the thyrocyte into the colloid lumen through the apical membrane. May be responsible for the absorption of D-lactate and monocarboxylate drugs from the intestinal tract. Acts as a tumor suppressor, suppressing colony formation in colon cancer, prostate cancer and glioma cell lines. May play a critical role in the entry of L-lactate and ketone bodies into neurons by a process driven by an electrochemical Na+ gradient and hence contribute to the maintenance of the energy status and function of neurons.

Biological Process

Biological Process apoptotic processIEA:UniProtKB-KW
Biological Process ion transportTAS:Reactome
Biological Process NAD biosynthesis via nicotinamide riboside salvage pathwayTAS:Reactome
Biological Process propanoate transportManual Assertion Based On ExperimentIBA:GO_Central
Biological Process sodium ion transportManual Assertion Based On ExperimentIBA:GO_Central

Cellular Location

Apical cell membrane
Expressed at the apical membrane of normal tall thyrocytes and of colonic epithelial cells.