title: Biliary dysgenesis in the PCK rat, an orthologous model of autosomal recessive polycystic kidney disease.
abstract: Hepatic polycystic disease occurs alone or in combination with polycystic kidney disease (PKD). In autosomal recessive PKD (ARPKD), liver lesions are the major cause of morbidity and mortality in older patients. ARPKD is caused by a mutation to PKHD1 and the PCK rat is an orthologous model of disease. Recently, we showed that fibrocystin, Pkhd1 protein, is localized to primary cilia in rat cholangiocytes and that disruption of its ciliary expression results in biliary cystogenesis. This study describes biliary phenotype in the PCK rat using micro-computed tomography scanning and three-dimensional reconstruction, and light, scanning, and transmission microscopy. Our results show that the biliary tree undergoes extensive remodeling resulting in bile duct dilatation, focal budding, and formation of cysts that are initially connected to bile ducts, but throughout time separate from them. Progressive liver enlargement results from massive cyst formation while liver parenchymal volume remains unchanged. Cilia in cystic cells are abnormal consistent with the notion that the primary defect in ARPKD resulting in cystogenesis may be linked to ciliary dysfunction. Our results suggest that the PCK rat is a useful model for studies of biliary cystogenesis and treatment options of inherited cystic liver disease.
authors.affiliation: Mayo Medical School, Clinic and Foundation, 200 First St., SW, Rochester, MN 55905, USA.
authors.forename: Tatyana V
authors.initials: TV
authors.lastname: Masyuk
authors.forename: Bing Q
authors.initials: BQ
authors.lastname: Huang
authors.forename: Anatoliy I
authors.initials: AI
authors.lastname: Masyuk
authors.forename: Erik L
authors.initials: EL
authors.lastname: Ritman
authors.forename: Vicente E
authors.initials: VE
authors.lastname: Torres
authors.forename: Xiaofang
authors.initials: X
authors.lastname: Wang
authors.forename: Peter C
authors.initials: PC
authors.lastname: Harris
authors.forename: Nicholas F
authors.initials: NF
authors.lastname: Larusso
mesh_terms: D000818:Animals; D001659:Biliary Tract / Q000002:abnormalities*; D001660:Biliary Tract Diseases / Q000473:pathology; D002454:Cell Differentiation; D049109:Cell Proliferation; D002923:Cilia / Q000473:pathology; D000013:Congenital Abnormalities / Q000209:etiology* / Q000473:pathology; D006801:Humans; D007150:Immunohistochemistry; D008099:Liver / Q000473:pathology; D008107:Liver Diseases / Q000473:pathology; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D009154:Mutation; D017044:Polycystic Kidney, Autosomal Recessive / Q000235:genetics*; D051381:Rats; D011956:Receptors, Cell Surface / Q000378:metabolism; D013997:Time Factors; D014057:Tomography, X-Ray Computed
chemical_list: C479541:PKHD1 protein, rat; D011956:Receptors, Cell Surface