Abstract
Most cholestatic disorders are caused by defects in cholangiocytes. The type 3 isoform of the inositol 1,4,5-trisphosphate receptor (ITPR3) is the most abundant intracellular calcium release channel in cholangiocytes. ITPR3 is required for bicarbonate secretion by bile ducts, and its expression is reduced in intrahepatic bile ducts of patients with cholestatic disorders. We investigated whether the nuclear factor, erythroid 2-like 2 (NFE2L2 or NRF2), which is sensitive to oxidative stress, regulates expression of ITPR3. The activity of the ITPR3 promoter was measured in normal human cholangiocyte (NHC) cells and primary mouse cholangiocytes. Levels of ITPR3 protein and messenger RNA were examined by immunoblot and polymerase chain reaction analyses, respectively. ITPR3 activity was determined by measuring calcium signaling in normal human cholangiocyte cells and secretion in isolated bile duct units. Levels of NRF2 were measured in liver tissues from rats with cholestasis (induced by administration of α-napthylisothiocyanate) and from patients with biliary diseases. We identified a musculo-aponeurotic fibrosarcoma recognition element in the promoter of ITPR3 that bound NRF2 directly in NHC cells and mouse cholangiocytes. Increa...Continue Reading
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