title: Bipotential mouse embryonic liver (BMEL) cells spontaneously express Pdx1 and Ngn3 but do not undergo further pancreatic differentiation upon Hes1 down-regulation.
abstract: 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.
authors.affiliation: Immuno-endocrinology Unit 707, National Veterinary School, F-44300 Nantes, France. bosch@vet-nantes.fr.
authors.forename: Juliette Cuvelier
authors.initials: JC
authors.lastname: Delisle
authors.forename: Lionel
authors.initials: L
authors.lastname: Martignat
authors.forename: Jean-Marie
authors.initials: JM
authors.lastname: Bach
authors.forename: Steffi
authors.initials: S
authors.lastname: Bösch
authors.forename: Vanessa
authors.initials: V
authors.lastname: Louzier