Inflammation and proliferation act together to mediate intestinal cell fusion.
Cell fusion between circulating bone marrow-derived cells (BMDCs) and non-hematopoietic cells is well documented in various tissues and has recently been suggested to occur in response to injury. Here we illustrate that inflammation within the intestine enhanced the level of BMDC fusion with intestinal progenitors. To identify important microenvironmental factors mediating intestinal epithelial cell fusion, we performed bone marrow transplantation into mouse models of inflammation and stimulated epithelial proliferation. Interestingly, in a non-injury model or in instances where inflammation was suppressed, an appreciable baseline level of fusion persisted. This suggests that additional mediators of cell fusion exist. A rigorous temporal analysis of early post-transplantation cellular dynamics revealed that GFP-expressing donor cells first trafficked to the intestine coincident with a striking increase in epithelial proliferation, advocating for a required fusogenic state of the host partner. Directly supporting this hypothesis, induction of augmented epithelial proliferation resulted in a significant increase in intestinal cell fusion. Here we report that intestinal inflammation and epithelial proliferation act together to promote cell fusion. While the physiologic impact of cell fusion is not yet known, the increased incidence in an inflammatory and proliferative microenvironment suggests a potential role for cell fusion in mediating the progression of intestinal inflammatory diseases and cancer.
Davies
Paige S
PS
Department of Dermatology, Knight Cancer Institute, Oregon Stem Cell Center, Oregon Health & Science University, Portland, Oregon, United States of America.
Powell
Anne E
AE
Swain
John R
JR
Wong
Melissa H
MH
D000818:Animals; D001483:Base Sequence; D001854:Bone Marrow Cells / Q000473:pathology; D016026:Bone Marrow Transplantation; D002459:Cell Fusion; D049109:Cell Proliferation; D017931:DNA Primers; D007249:Inflammation / Q000473:pathology*; D007413:Intestinal Mucosa / Q000473:pathology*; D008099:Liver / Q000473:pathology; D051379:Mice; D008810:Mice, Inbred C57BL; D018482:Muscle, Skeletal / Q000473:pathology; D020133:Reverse Transcriptase Polymerase Chain Reaction
D017931:DNA Primers