title: Hepatic progenitor cell resistance to TGF-beta1's proliferative and apoptotic effects.
abstract: The success of hepatocellular therapies using stem or progenitor cell populations is dependent upon multiple factors including the donor cell, microenvironment, and etiology of the liver injury. The following experiments investigated the impact of TGF-beta1 on a previously described population of hepatic progenitor cells (HPC). The majority of the hepatic progenitor cells were resistant to endogenously produced TGF-beta1's proapoptotic and anti-proliferative effects unlike more well-differentiated cellular populations (e.g., mature hepatocytes). Surprisingly, in vitro TGF-beta1 supplementation significantly inhibited de novo hepatic progenitor cell colony formation possibly via an indirect mechanism(s). Therefore despite the HPC's direct resistance to supplemental TGF-beta1, this cytokine's inhibitory effect on colony formation could have a potential negative impact on the use of these cells as a therapy for patients with liver disease.
authors.affiliation: CB# 7211, 2111 Bioinformatics Building, Department of Surgery, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7211, USA.
authors.forename: J Brian
authors.initials: JB
authors.lastname: Clark
authors.forename: Lisa
authors.initials: L
authors.lastname: Rice
authors.forename: Tim
authors.initials: T
authors.lastname: Sadiq
authors.forename: Evan
authors.initials: E
authors.lastname: Brittain
authors.forename: Lujun
authors.initials: L
authors.lastname: Song
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: David A
authors.initials: DA
authors.lastname: Gerber
mesh_terms: D000818:Animals; D017209:Apoptosis; D001973:Bromodeoxyuridine / Q000494:pharmacology; D053148:Caspase 3; D020169:Caspases / Q000378:metabolism; D002454:Cell Differentiation; D049109:Cell Proliferation; D016207:Cytokines / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D004797:Enzyme-Linked Immunosorbent Assay; D022781:Hepatocytes / Q000166:cytology / Q000378:metabolism; D006801:Humans; D008099:Liver / Q000166:cytology* / Q000293:injuries / Q000473:pathology; D008156:Luciferases / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D008856:Microscopy, Fluorescence; D010957:Plasmids / Q000378:metabolism; D013234:Stem Cells / Q000166:cytology*; D013997:Time Factors; D014162:Transfection; D016212:Transforming Growth Factor beta / Q000378:metabolism*; D053773:Transforming Growth Factor beta1
chemical_list: D016207:Cytokines; C508960:TGFB1 protein, human; C508961:Tgfb1 protein, mouse; D016212:Transforming Growth Factor beta; D053773:Transforming Growth Factor beta1; D008156:Luciferases; C505407:CASP3 protein, human; C505409:Casp3 protein, mouse; D053148:Caspase 3; D020169:Caspases; D001973:Bromodeoxyuridine