Th1 cytokine–induced downregulation of PPARγ in human biliary cells relates to cholangitis in primary biliary cirrhosis
Kenichi Harada, Kumiko Isse, Takashi Kamihira, Shinji Shimoda, Yasuni Nakanuma – 23 May 2005 – Peroxisome proliferator‐activated receptor‐γ (PPARγ) is known to inhibit the production of proinflammatory cytokines. In Th1‐predominant diseases, PPARγ ligands can ameliorate clinical severity by downregulating the expression of proinflammatory cytokines. Primary biliary cirrhosis (PBC) is characterized by chronic destructive cholangitis with a Th1‐predominant cytokine milieu. Unusual immune responses to infectious agents are suspected to underlie its etiopathogenesis.