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- W2148959437 abstract "Background & Aims: Progressive familial intrahepatic cholestasis (PFIC), an inherited liver disease of childhood, is characterized by cholestasis and either normal or increased serum γ-glutamyltransferase activity. Patients with normal γ-glutamyltransferase activity have mutations of the FIC1 locus on chromosome 18q21 or mutations of the BSEP gene on chromosome 2q24. Also, patients with bile acid synthesis defects have low γ-glutamyltransferase activity. We investigated expression of the bile salt export pump (BSEP) in liver samples from patients with a PFIC phenotype and correlated this with BSEP gene mutations.Methods: BSEP and multidrug resistance protein 2 (MRP2) expressions were studied by immunohistochemistry in liver specimens of 28 patients and BSEP gene mutation analysis in 19 patients. Bile salt kinetics were studied in 1 patient.Results: Sixteen of 28 liver samples showed no canalicular BSEP staining. Staining for MRP2 showed a normal canalicular pattern in all but 1 of these samples. Ten of 19 patients showed BSEP gene mutations; BSEP protein expression was lacking in all 10 patients. No mutations were found in 9 of 19 patients, and in all except 1, BSEP protein expression was normal. Bile salt concentration in bile of BSEP-negative/MRP2-positive PFIC patients was 0.2 ± 0.2 mmol/L (n = 9; <1% of normal) and in BSEP-positive PFIC patients 18.1 ± 9.9 mmol/L (n = 3; 40% of normal). The kinetic study confirmed the dramatic decrease of bile salt secretion in BSEP-negative patients.Conclusions: The findings show a close correlation between BSEP gene mutations and canalicular BSEP expression. Biliary secretion of bile salts is greatly reduced in BSEP-negative patients.GASTROENTEROLOGY 1999;117:1370-1379" @default.
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- W2148959437 date "1999-12-01" @default.
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- W2148959437 title "Hepatocanalicular bile salt export pump deficiency in patients with progressive familial intrahepatic cholestasis" @default.
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- W2148959437 doi "https://doi.org/10.1016/s0016-5085(99)70287-8" @default.
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