Bipotential mouse embryonic liver (BMEL) cells spontaneously express Pdx1 and Ngn3 but do not undergo further pancreatic differentiation upon Hes1 down-regulation.
BACKGROUND
Liver-to-pancreas conversion offers new possibilities for beta-cell engineering for type 1 diabetes therapy. Among conceivable sources of liver cells, we focused on BMEL cells. These untransformed mouse embryonic liver cells have been reproducibly isolated from different inbred mice strains and have the potential to differentiate into hepatocytes and cholangiocytes in vitro and in vivo.


RESULTS
Strikingly, we find here that adherent BMEL cells display functional similarities with multipotent pancreatic precursor cells, namely Pdx1 and Ngn3 expression, and further express Hnf6 in floating aggregate culture. Hes1, a direct repressor of Ngn3 and pancreatic endocrine commitment, is expressed in adherent BMEL cells and decreases with time in aggregate culture. However, Hes1 decrease fails to initiate activation of late-stage pancreatic endocrine transcription factors.


CONCLUSIONS
Here we report that BMEL cells present features of pancreatic endocrine progenitor cells. In the field of diabetes research, BMEL cells are of potential interest for the study of inductive signals critical for in vitro beta-cell maturation in-liver-to-pancreas conversion.
Delisle
Juliette Cuvelier
JC
Immuno-endocrinology Unit 707, National Veterinary School, F-44300 Nantes, France. bosch@vet-nantes.fr.
Martignat
Lionel
L
Bach
Jean-Marie
JM
Bösch
Steffi
S
Louzier
Vanessa
V