title: Resistance to TGF-beta-induced apoptosis in regenerating hepatocytes.
abstract: Treatment with transforming growth factor beta (TGF-beta) of hepatocytes from two different proliferative conditions, such as fetal development and adult liver regeneration, shows that regenerating cells respond to this cytokine in terms of growth inhibition, but are less sensitive than the fetal ones to the apoptosis induced by this factor. Regenerating TGF-beta treated cells show higher cell viability and lower percentage of apoptotic cells than the fetal treated ones. Furthermore, TGF-beta treated regenerating hepatocytes maintain a well-preserved parenchyma-like organization. Treatment with TGF-beta induces the loss of mitochondrial transmembrane potential in fetal but not in regenerating hepatocytes and activation of caspase-3 is lower in regenerating than in fetal cells. Regenerating hepatocytes show higher intracellular levels of some antiapoptotic proteins, such as Bcl-x(L) and c-IAP-1 and, interestingly, they present higher intracellular glutathione levels, which might provide of mechanisms to avoid potential dangerous effects of the oxidative stress-mediated apoptosis induced by TGF-beta. In fact, treatment with BSO (a glutathione synthesis inhibitor) restores the response of regenerating hepatocytes to TGF-beta in terms of cell death. In conclusion, increased levels of Bcl-x(L) and cIAP-1 and higher intracellular glutathione levels could confer resistance to the apoptosis induced by TGF-beta during liver regeneration.
authors.affiliation: Departamento de Bioquímica y Biología Molecular, Instituto de Bioquímica, Centro Mixto CSIC/UCM, Madrid, Spain.
authors.forename: Blanca
authors.initials: B
authors.lastname: Herrera
authors.forename: Alberto M
authors.initials: AM
authors.lastname: Alvarez
authors.forename: Jesús
authors.initials: J
authors.lastname: Beltrán
authors.forename: Francisco
authors.initials: F
authors.lastname: Valdés
authors.forename: Isabel
authors.initials: I
authors.lastname: Fabregat
authors.forename: Margarita
authors.initials: M
authors.lastname: Fernández
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects*; D002478:Cells, Cultured; D004351:Drug Resistance; D005978:Glutathione / Q000378:metabolism; D022781:Hepatocytes / Q000166:cytology* / Q000187:drug effects* / Q000378:metabolism; D006801:Humans; D008115:Liver Regeneration / Q000187:drug effects*; D008928:Mitochondria / Q000187:drug effects / Q000502:physiology; D051381:Rats; D016212:Transforming Growth Factor beta / Q000494:pharmacology*
chemical_list: D016212:Transforming Growth Factor beta; D005978:Glutathione