Effects of angiogenic factor overexpression by human and rodent cholangiocytes in polycystic liver diseases.

Hepatology : Official Journal of the American Association for the Study of Liver Diseases
Luca FabrisMario Strazzabosco

Abstract

Liver involvement in autosomal dominant polycystic kidney disease (ADPKD) is characterized by altered remodeling of the embryonic ductal plate (DP) with presence of biliary cysts and aberrant portal vasculature. The genetic defect causing ADPKD has been identified, but mechanisms of liver cyst growth remain uncertain. To investigate the possible role of angiogenic mechanisms, we have studied the immunohistochemical expression of vascular endothelial growth factor (VEGF), angiopoietin-1 (Ang-1), angiopoietin-2 (Ang-2) and their receptors (VEGFR-1, VEGFR-2, Tie-2) in ADPKD, Caroli's disease, normal and fetal livers. In ADPKD and control livers Ang-1 and Ang-2 gene expression was studied by real-time-PCR. Effects of VEGF on cholangiocyte proliferation were studied by PCNA Western Blot in isolated rat cholangiocytes and by MTS assay in cultured cholangiocytes isolated from ADPKD patients and from an ADPKD mouse model (Pkd2(WS25/-)). Cholangiocytes were strongly positive for VEGF, VEGFR-1, VEGFR-2 and Ang-2 in ADPKD and Caroli, and also for Ang-1 and Tie-2 in ADPKD, similar to fetal ductal plate cells. VEGF stimulated proliferation in both normal and ADPKD cholangiocytes, but the effect was particularly evident in the latter. Ang-1 ...Continue Reading

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