Perspectives for Regenerative Medicine in the Treatment of Inflammatory Bowel Diseases.

The intestinal epithelium exerts multiple, indispensable functions to maintain the homeostasis of our body. However, this layer is frequently damaged by various gastrointestinal diseases; repair of such a damaged intestinal epithelium becomes difficult and the stem cell function gets lost or severely disrupted. Recent advances in the stem cell biology of the gastrointestinal tract have provided major breakthroughs, such as in vitro culture of intestinal stem cells (ISCs), and have also thrown light on the transplantation of those cells to repair the damaged intestinal mucosa. Based on such newly developed techniques, we are now coming close to apply them to treat various gastrointestinal diseases, including inflammatory bowel diseases (IBD). Accordingly, ISC-based therapy is currently under development for treating IBD patients, which may potentially provide benefits to those patients by the achievement of mucosal healing and the subsequent improvement of their prognosis. In this review, we would like to highlight studies that have provided information on the great advances made thus far in the research of ISCs. In addition, we would like to express some of our perspectives on the clinical use of ex-vivo-cultured ISCs in the treatment of IBD.