KLF5 and inflammatory bowel disease: Besides, exosomes from other cells, like krüppel-like factor 5-overexpressing vascular smooth muscle cells (26–28), human leukocyte antigen-G1-transfected cells (29, 30), myeloid-derived suppressor cells (31, 32) or transglutaminase type 2 proficient cells (33, 34), were studied, while the contents in these exosomes were already detected to influence IBD progression in different ways.