Optimized human intestinal organoid model reveals interleukin-22-dependency of paneth cell formation
Gui-Wei He, Lin Lin, Jeff DeMartino, Xuan Zheng, Nadzeya Staliarova, Talya Dayton, Harry Begthel, Willine J van de Wetering, Eduard Bodewes, Jeroen van Zon, Sander Tans, Carmen Lopez-Iglesias, Peter J Peters, Wei Wu, Daniel Kotlarz, Christoph Klein, Thanasis Margaritis, Frank Holstege, Hans Clevers
Published: 1 September 2022
Opposing roles have been proposed for IL-22 in intestinal pathophysiology. We have optimized human small intestinal organoid (hSIO) culturing, constitutively generating all differentiated cell types while maintaining an active stem cell compartment. IL-22 does not promote the expansion of stem cells but rather slows the growth of hSIOs. In hSIOs, IL-22 is required for formation of Paneth cells, the prime producers of intestinal antimicrobial peptides (AMPs). Introduction of inflammatory bowel disease (IBD)-associated loss-of-function mutations in the IL-22 co-receptor gene IL10RB resulted in abolishment of Paneth cells in hSIOs. Moreover, IL-22 induced expression of host defense genes (such as REG1A, REG1B, and DMBT1) in enterocytes, goblet cells, Paneth cells, Tuft cells, and even stem cells. Thus, IL-22 does not directly control the regenerative capacity of crypt stem cells but rather boosts Paneth cell numbers, as well as the expression of AMPs in all cell types.