A reversible fluorescent probe DRhFe is devised by linking spirolactam rhodamine and dansylamide
through an Fe3+ ionophore N
2-hydroxyethyldiethylenetriamine, where Fe3+ chelation
generating rhodamine B can switch intramolecular fluorescence resonance
energy transfer for ratiometric Fe3+ sensing. Probe DRhFe exhibits an Fe3+-specific emission shift
from 483 to 576 nm, and this ratiometric response has been successfully
applied to monitor labile Fe3+ fluctuations in cells undergoing
ferroptosis.
CD47 deficient mice are resistant to dextran sulfate sodium (DSS)-induced experimental colitis. The underlying mechanism, however, remains incompletely understood. In this study, we characterized the role of CD47 in modulating homeostasis of gastrointestinal tract. We found that CD47 expression in both human and mouse intestinal epithelium was upregulated in colitic condition compared to that under normal condition. In line with this, CD47 deficiency protected mice from DSS-induced colitis. Analysis based on both intestinal organoid and cultured cell assays showed that CD47 deficiency accelerated intestinal epithelial cell proliferation and migration. Mechanistically, western blot and functional assays indicated that CD47 deficiency promoting mouse intestinal epithelial cell proliferation and migration follow cell injury is likely through upregulating expression of four Yamanaka transcriptional factors Oct4, Sox2, Klf4 and c-Myc (OSKM in abbreviation). Our studies thus reveal CD47 as a negative regulator in intestinal epithelial cell renewal during colitis through downregulating OSKM transcriptional factors.
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