Role of NKT Cells in the Digestive System. I. Invariant NKT cells and liver diseases: is there strength in numbers?

Role of NKT Cells in the Digestive System. II. Invariant NKT cells and liver diseases: is there strength in numbers? Am J Physiol Gastrointest Liver Physiol 293: G651-G656, 2007. First published July 12, 2007; doi:10.1152/ajpgi.00298.2007. -Information regarding the functional role of the innate immune T cell, invariant natural killer T (iNKT) cells, in the pathophysiology of liver diseases continues to emerge. Results from animal studies suggest that iNKT cells can have divergent roles by specifically promoting the development of proinflammatory or anti-inflammatory responses in liver diseases. In this themes article, I discuss the critical evidence from animal models that demonstrate a vital role for iNKT cells in the pathophysiology of liver diseases with emphasis on viral, autoimmune, and toxin-induced liver diseases. Furthermore, I discuss the controversial issues ( including iNKT cell apoptosis) that typify some of these studies. Finally, I highlight areas that require additional investigation.