title: Establishment of embryonic stem cells secreting human factor VIII for cell-based treatment of hemophilia A.
abstract: BACKGROUND
  Hemophilia A is an X-chromosome-linked recessive bleeding disorder resulting from an F8 gene abnormality. Although various gene therapies have been attempted with the aim of eliminating the need for factor VIII replacement therapy, obstacles to their clinical application remain.
  
  
  OBJECTIVE
  We evaluated whether embryonic stem (ES) cells with a tetracycline-inducible system could secrete human FVIII.
  
  
  RESULTS
  We found that embryoid bodies (EBs) developed under conditions promoting liver differentiation efficiently secreted human FVIII after doxycycline induction. Moreover, use of a B-domain variant F8 cDNA (226aa/N6) dramatically enhanced FVIII secretion. Sorting based on green fluorescent protein (GFP)-brachyury (Bry) and c-kit revealed that GFP-Bry(+)/c-kit(+) cells during EB differentiation with serum contain an endoderm progenitor population. When GFP-Bry(+)/c-kit(+) cells were cultured under the liver cell-promoting conditions, these cells secreted FVIII more efficiently than other populations tested.
  
  
  CONCLUSIONS
  Our findings suggest the potential for future development of an effective ES cell-based approach to treating hemophilia A.
authors.affiliation: Department of Paediatrics, Nara Medical University, Kashihara, Nara, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Kasuda
authors.forename: A
authors.initials: A
authors.lastname: Kubo
authors.forename: Y
authors.initials: Y
authors.lastname: Sakurai
authors.forename: S
authors.initials: S
authors.lastname: Irion
authors.forename: K
authors.initials: K
authors.lastname: Ohashi
authors.forename: K
authors.initials: K
authors.lastname: Tatsumi
authors.forename: Y
authors.initials: Y
authors.lastname: Nakajima
authors.forename: Y
authors.initials: Y
authors.lastname: Saito
authors.forename: K
authors.initials: K
authors.lastname: Hatake
authors.forename: S W
authors.initials: SW
authors.lastname: Pipe
authors.forename: M
authors.initials: M
authors.lastname: Shima
authors.forename: A
authors.initials: A
authors.lastname: Yoshioka
mesh_terms: D018929:Cell Culture Techniques / Q000379:methods; D002454:Cell Differentiation; D004318:Doxycycline / Q000494:pharmacology; D053595:Embryonic Stem Cells / Q000166:cytology / Q000378:metabolism*; D005169:Factor VIII / Q000096:biosynthesis* / Q000235:genetics; D015870:Gene Expression / Q000187:drug effects; D014644:Genetic Variation; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D006467:Hemophilia A / Q000188:drug therapy*; D006801:Humans; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000235:genetics
chemical_list: D012333:RNA, Messenger; D011994:Recombinant Proteins; D049452:Green Fluorescent Proteins; C078147:F8 protein, human; D005169:Factor VIII; D004318:Doxycycline