Secretion of cytokines and growth factors into autosomal dominant polycystic kidney disease liver cyst fluid

Hepatology : Official Journal of the American Association for the Study of Liver Diseases
Matthew T NicholsR Brian Doctor

Abstract

The principal extrarenal manifestation of autosomal dominant polycystic kidney disease (ADPKD) involves formation of liver cysts derived from intrahepatic bile ducts. Autocrine and paracrine factors secreted into the cyst would be positioned to modulate the rate of hepatic cyst growth. The aim of this study was to identify potential growth factors present in human ADPKD liver cyst fluid. Cytokine array and enzyme-linked immunosorbent assay analysis of human ADPKD liver cyst fluid detected epithelial neutrophil attractant 78, interleukin (IL)-6 (503 +/- 121 pg/mL); and IL-8 (4,488 +/- 355 pg/mL); and elevated levels of vascular endothelial growth factor compared with non-ADPKD bile (849 +/- 144 pg/mL vs. 270 pg/mL maximum concentration). ADPKD liver cyst cell cultures also released IL-8 and vascular endothelial growth factor, suggesting that cystic epithelial cells themselves are capable of secreting these factors. Western blotting of cultured cyst cells and immunostaining of intact cysts demonstrate that cysteine-X-cysteine receptor 2, an epithelial neutrophil attractant 78 and IL-8 receptor, is expressed at the apical domain of cyst lining epithelial cells. Suggesting the cystic epithelial cells may exist in hypoxic conditions...Continue Reading

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