Abstract:Intrahepatic cholestasis is often associated with impairment of biliary bile acid secretion, a process mediated by the sister of P-glycoprotein (Spgp or Abcb11) also known as the bile salt export pump (Bsep). In humans, mutations in the Spgp gene are associated with a fatal childhood disease, type 2 progressive familial intrahepatic cholestasis (PFIC2). However in mice, the "knockout" of Spgp only results in mild cholestasis. In this study, we fed spgp(-/-) knockout mice with a cholic acid (CA)-supplemented di… Show more
“…Unexpectedly, cholate-fed knockout mice secrete significant amounts of cholate conjugate into bile, indicating a salvage transport system for canalicular bile salt secretion. Comparative analysis of gene expression profiles in control and knockout-mice after cholate feeding revealed a striking upregulation of Mdr1a [98]. This observation may indicate that mouse Mdr1a could act as a salvage transporter for bile salts in conditions of high intracellular bile salt concentration.…”
Section: Mice With Genetically Altered Bsep Expressionmentioning
confidence: 86%
“…The Bsep knockout animals have substantial increases of malondialdehyde levels in brain and heart, indicating an increased lipid peroxidation as a consequence of elevated serum bile acid levels [56]. If Bsep knockout animals are fed with a diet containing cholate, they become severely cholestatic and have a high mortality rate, which is more pronounced in males than females [98]. Unexpectedly, cholate-fed knockout mice secrete significant amounts of cholate conjugate into bile, indicating a salvage transport system for canalicular bile salt secretion.…”
Section: Mice With Genetically Altered Bsep Expressionmentioning
“…Unexpectedly, cholate-fed knockout mice secrete significant amounts of cholate conjugate into bile, indicating a salvage transport system for canalicular bile salt secretion. Comparative analysis of gene expression profiles in control and knockout-mice after cholate feeding revealed a striking upregulation of Mdr1a [98]. This observation may indicate that mouse Mdr1a could act as a salvage transporter for bile salts in conditions of high intracellular bile salt concentration.…”
Section: Mice With Genetically Altered Bsep Expressionmentioning
confidence: 86%
“…The Bsep knockout animals have substantial increases of malondialdehyde levels in brain and heart, indicating an increased lipid peroxidation as a consequence of elevated serum bile acid levels [56]. If Bsep knockout animals are fed with a diet containing cholate, they become severely cholestatic and have a high mortality rate, which is more pronounced in males than females [98]. Unexpectedly, cholate-fed knockout mice secrete significant amounts of cholate conjugate into bile, indicating a salvage transport system for canalicular bile salt secretion.…”
Section: Mice With Genetically Altered Bsep Expressionmentioning
“…S3D), indicating general down-regulation of bile acid synthesis. It is notable that most of these changes in gene expression have been reported in Abcb11 deficiency on either a mixed genetic background or FVB (9,23).…”
“…For example, while taurolithosulfocholate is not transported by rat Bsep (24,76), it is a substrate of human BSEP (76). Furthermore, mice with an ablated Bsep gene do not develop severe cholestasis on a normal diet (77), but need to be put on a high cholate diet (78). As a consequence of absent Bsep, novel, more hydrophilic bile salts have been detected in the bile of knockout animals (77) as well as an upregulation of p-glyocoprotein, which could provide a salvage pathway for bile salts (79).…”
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