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Protein tyrosine phosphatase 1B deficiency protects against paracetamol-induced hepatotoxicity

AutorMobasher, Maysa A.; Martín, M. Ángeles ; Ramos, Sonia ; Goya, Luis ; Muntané, J.; González-Rodríguez, Águeda; Valverde, Ángela M.
Fecha de publicación2011
CitaciónXXXIV Congreso SEBBM (2011)
ResumenAcetaminophen (APAP) is an analgesic and antipyretic drug safe at therapeutic doses but its overdose causes liver injury. Protein tyrosine phosphatase 1B (PTP1B) is a negative regulator of growth factor signalling and modulate the balance between survival and cell death. Our purpose was to study if PTP1B plays a role in APAP-induced hepatotoxicity. APAP induced hepatotoxicity was evaluated in immortalized hepatocytes from wild-type (PTP1B+/+) and PTP1B-/- mice. PTP1B deficiency protected against GSH depletion, elevation of ROS, cell cycle arrest and apoptotic/necrotic cell death. At the molecular level, phosphorylation of JNK and p38 was higher in APAPtreated wild-type hepatocytes compared to PTP1B-/- cells. Regarding survival signaling, phosphorylation of IGF-IR, levels of IRS1 and IRS2 and activation of Akt decreased in wild-type hepatocytes but not in PTP1B-/-cells. Therefore, the expression of the anti-apoptotic proteins BclxL and Mcl-1 was reduced in wild-type cells, but it was maintained in PTP1B-/- hepatocytes. We confirmed these results in the liver of wild type and PTP1B-/- mice after ip APAP injection. We found increased JNK phosphorylation at 1-6 h post-injection. Survival signaling including phosphorylation of IGF-IR, levels of IRS1 and activation of Akt was decreased at 6 h after APAP injection in wild-type mice, but not in PTP1B-/- mice. GSH depletion and ROS levels were attenuated in PTP1B-/- livers in parallel with an increase in nuclear Nrf2 accumulation and HO-1 induction. Finally, treatment of human hepatocytes with APAP increased PTP1B expression and activation of JNK and p38, decreasing survival signaling and cellular viability. Our data suggest that PTP1B might be a target against APAPinduced hepatotoxicity.
DescripciónResumen del póster presentado al XXXIV Congreso de la Sociedad Española de Bioquímica y Biología Molecular, celebrado en Barcelona del 5 al 8 de septiembre de 2011.
URIhttp://hdl.handle.net/10261/154260
Aparece en las colecciones: (IIBM) Comunicaciones congresos
(ICTAN) Comunicaciones congresos
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