In vitro formation of enteric neural network structure in a gut-like organ differentiated from mouse embryonic stem cells

Stem Cells
Miyako TakakiHiroki Kuniyasu

Abstract

Using an embryoid body (EB) culture system, we developed a functional organ-like cluster--a "gut"--from mouse embryonic stem (ES) cells (ES gut). Each ES gut exhibited spontaneous contractions but did not exhibit distinct peristalsis-like movements. In these spontaneously contracting ES guts, dense distributions of interstitial cells of Cajal (c-kit [a transmembrane receptor that has tyrosine kinase activity]-positive cells; gut pacemaker cells) and smooth muscle cells were discernibly identified; however, enteric neural ganglia were absent in the spontaneously differentiated ES gut. By adding brain-derived neurotrophic factor (BDNF) only during EB formation, we for the first time succeeded in in vitro formation of enteric neural ganglia with connecting nerve fiber tracts (enteric nervous system [ENS]) in the ES gut. The ES gut with ENS exhibited strong peristalsis-like movements. During EB culture in BDNF(+) medium, we detected each immunoreactivity associated with the trk proto-oncogenes (trkB; BDNF receptors) and neural crest marker, proto-oncogene tyrosine-protein kinase receptor ret precursor (c-ret), p75, or sox9. These results indicated that the present ENS is differentiated from enteric neural crest-derived cells. Moreo...Continue Reading

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