Inflammatory cytokines, but not bile acids, regulate expression of murine hepatic anion transporters in endotoxemia.

Article Details

Citation

Hartmann G, Cheung AK, Piquette-Miller M

Inflammatory cytokines, but not bile acids, regulate expression of murine hepatic anion transporters in endotoxemia.

J Pharmacol Exp Ther. 2002 Oct;303(1):273-81.

PubMed ID
12235261 [ View in PubMed
]
Abstract

Endotoxin-mediated cholestasis stems from impaired hepatobiliary transport of bile acids and organic anions due to altered expression and activity of transporters, including Oatp, Mrp, Ntcp, and Bsep. However, the mechanisms by which the Oatp and Mrp genes are down-regulated are largely unknown. Using in vivo and in vitro murine models of inflammation, we examined the role of cytokines and bile acids in regulating Oatp and Mrp. Endotoxin (lipopolysaccharide, LPS), interleukin (IL)-6, IL-1beta, tumor necrosis factor (TNF)-alpha, cholic acid, taurocholate, or taurodeoxycholate was administered in vivo to mice or in vitro to Hepa 1-6 mouse hepatoma cells. Mrp, Oatp, and Bsep mRNA levels were measured by reverse transcription-polymerase chain reaction. Mrp efflux activity was measured using 5-carboxyfluorescein. In vivo, LPS treatment profoundly suppressed hepatic mRNA levels of Mrp2, Mrp3, Oatp1, Oatp2, and Bsep to 15, 60, 44, 30, and 32% of controls, respectively (p < 0.05), but did not significantly alter Mrp1 expression. IL-6 or IL-1beta administration suppressed Mrp2, Oatp1, Oatp2, and Bsep mRNA levels to 20 to 60% controls (p < 0.05). TNF-alpha administration affected mRNA levels of Mrp2, Mrp3, and Oatp2 but not Oatp1 or Bsep. Bile acid treatment increased the in vivo expression of Bsep but not Mrp or Oatp. Likewise, significantly lower mRNA levels of Mrp2 with a corresponding decrease in cellular efflux of 5-carboxyfluorescein was seen in vitro in IL-6- and IL-1beta-treated Hepa 1-6 cells, whereas bile acids did not have significant effects. In conclusion, cytokines are key mediators in regulating hepatic expression of anion transporters in inflammatory cholestasis, whereas bile acids likely play a minor role.

DrugBank Data that Cites this Article

Drug Transporters
DrugTransporterKindOrganismPharmacological ActionActions
Cholic AcidBile salt export pumpProteinHumans
Unknown
Substrate
Inhibitor
Inducer
Details
Cholic AcidMultidrug resistance-associated protein 1ProteinHumans
Unknown
Inducer
Details
Cholic AcidSolute carrier organic anion transporter family member 1B1ProteinHumans
Unknown
Substrate
Inhibitor
Inducer
Details
Taurocholic acidBile salt export pumpProteinHumans
Unknown
Substrate
Inducer
Details
Taurocholic acidCanalicular multispecific organic anion transporter 1ProteinHumans
Unknown
Inducer
Details
Taurocholic acidMultidrug resistance-associated protein 1ProteinHumans
Unknown
Inhibitor
Inducer
Details
Taurocholic acidSolute carrier organic anion transporter family member 1A2ProteinHumans
Unknown
Substrate
Inhibitor
Inducer
Details
Taurocholic acidSolute carrier organic anion transporter family member 1B1ProteinHumans
Unknown
Substrate
Inhibitor
Inducer
Details