Top ▲

SLC51 family of steroid-derived molecule transporters C

Unless otherwise stated all data on this page refer to the human proteins. Gene information is provided for human (Hs), mouse (Mm) and rat (Rn).


Click here for help

« Hide

The SLC51 organic solute transporter family of transporters is a pair of heterodimeric proteins which regulate bile salt movements in the small intestine, bile duct, and liver, as part of the enterohepatic circulation [1-2,4]. OSTα/OSTβ is also expressed in steroidogenic cells of the brain and adrenal gland, where it may contribute to steroid movement [5]. Bile acid transport is suggested to be facilitative and independent of sodium, potassium, chloride ions or protons [2,4]. OSTα/OSTβ heterodimers have been shown to transport [3H]taurocholic acid, [3H]dehydroepiandrosterone sulphate, [3H]estrone-3-sulphate, [3H]pregnenolone sulphate and [3H]dehydroepiandrosterone sulphate [2,4-5]. OSTα/OSTβ-mediated transport of bile salts is inhibited by clofazimine [9]. OSTα is suggested to be a seven TM protein, while OSTβ is a single TM 'ancillary' protein, both of which are thought to have intracellular C-termini [7]. Both proteins function in solute transport [3,7]. Inherited mutations in OSTα and OSTβ are associated with liver disease and congenital diarrhea in children [6,8].


Click here for help

Targets of relevance to immunopharmacology are highlighted in blue

OSTα (Organic solute transporter subunit α / SLC51A1) C Show summary »

OSTβ (Organic solute transporter subunit β / SLC51B) C Show summary »

Further reading

Click here for help

Show »


Click here for help

Show »

NC-IUPHAR subcommittee and family contributors

Show »

How to cite this family page

Database page citation (select format):

Concise Guide to PHARMACOLOGY citation:

Alexander SP, Kelly E, Mathie A, Peters JA, Veale EL et al. (2021) THE CONCISE GUIDE TO PHARMACOLOGY 2021/22: Transporters. Br J Pharmacol. 178 Suppl 1:S412-S513.