Hepatocyte IKK2 protects Mdr2-/- mice from chronic liver failure
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Hepatocyte IKK2 protects Mdr2-/- mice from chronic liver failure. / Ehlken, Hanno; Kondylis, Vangelis; Heinrichsdorff, Jan; Ochoa-Callejero, Laura; Roskams, Tania; Pasparakis, Manolis.
in: PLOS ONE, Jahrgang 6, Nr. 10, 01.01.2011, S. e25942.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - Hepatocyte IKK2 protects Mdr2-/- mice from chronic liver failure
AU - Ehlken, Hanno
AU - Kondylis, Vangelis
AU - Heinrichsdorff, Jan
AU - Ochoa-Callejero, Laura
AU - Roskams, Tania
AU - Pasparakis, Manolis
PY - 2011/1/1
Y1 - 2011/1/1
N2 - UNLABELLED: Mice lacking the Abc4 protein encoded by the multidrug resistance-2 gene (Mdr2(-/-)) develop chronic periductular inflammation and cholestatic liver disease resulting in the development of hepatocellular carcinoma (HCC). Inhibition of NF-κB by expression of an IκBα super-repressor (IκBαSR) transgene in hepatocytes was shown to prevent HCC development in Mdr2(-/-) mice, suggesting that NF-κB acts as a tumour promoter in this model of inflammation-associated carcinogenesis. On the other hand, inhibition of NF-κB by hepatocyte specific ablation of IKK2 resulted in increased liver tumour development induced by the chemical carcinogen DEN. To address the role of IKK2-mediated NF-κB activation in hepatocytes in the pathogenesis of liver disease and HCC in Mdr2(-/-) mice, we generated Mdr2-deficient animals lacking IKK2 specifically in hepatocytes using the Cre-loxP system. Mdr2(-/-) mice lacking IKK2 in hepatocytes developed spontaneously a severe liver disease characterized by cholestasis, major hyperbilirubinemia and severe to end-stage fibrosis, which caused muscle wasting, loss of body weight, lethargy and early spontaneous death. Cell culture experiments showed that primary hepatocytes lacking IKK2 were more sensitive to bile acid induced death, suggesting that hepatocyte-specific IKK2 deficiency sensitized hepatocytes to the toxicity of bile acids under conditions of cholestasis resulting in greatly exacerbated liver damage. Mdr2(-/-)IKK2(Hep-KO) mice remarkably recapitulate chronic liver failure in humans and might be of special importance for the study of the mechanisms contributing to the pathogenesis of end-stage chronic liver disease or its implications on other organs.CONCLUSION: IKK2-mediated signaling in hepatocytes protects the liver from damage under conditions of chronic inflammatory cholestasis and prevents the development of severe fibrosis and liver failure.
AB - UNLABELLED: Mice lacking the Abc4 protein encoded by the multidrug resistance-2 gene (Mdr2(-/-)) develop chronic periductular inflammation and cholestatic liver disease resulting in the development of hepatocellular carcinoma (HCC). Inhibition of NF-κB by expression of an IκBα super-repressor (IκBαSR) transgene in hepatocytes was shown to prevent HCC development in Mdr2(-/-) mice, suggesting that NF-κB acts as a tumour promoter in this model of inflammation-associated carcinogenesis. On the other hand, inhibition of NF-κB by hepatocyte specific ablation of IKK2 resulted in increased liver tumour development induced by the chemical carcinogen DEN. To address the role of IKK2-mediated NF-κB activation in hepatocytes in the pathogenesis of liver disease and HCC in Mdr2(-/-) mice, we generated Mdr2-deficient animals lacking IKK2 specifically in hepatocytes using the Cre-loxP system. Mdr2(-/-) mice lacking IKK2 in hepatocytes developed spontaneously a severe liver disease characterized by cholestasis, major hyperbilirubinemia and severe to end-stage fibrosis, which caused muscle wasting, loss of body weight, lethargy and early spontaneous death. Cell culture experiments showed that primary hepatocytes lacking IKK2 were more sensitive to bile acid induced death, suggesting that hepatocyte-specific IKK2 deficiency sensitized hepatocytes to the toxicity of bile acids under conditions of cholestasis resulting in greatly exacerbated liver damage. Mdr2(-/-)IKK2(Hep-KO) mice remarkably recapitulate chronic liver failure in humans and might be of special importance for the study of the mechanisms contributing to the pathogenesis of end-stage chronic liver disease or its implications on other organs.CONCLUSION: IKK2-mediated signaling in hepatocytes protects the liver from damage under conditions of chronic inflammatory cholestasis and prevents the development of severe fibrosis and liver failure.
KW - Animals
KW - Bile Acids and Salts
KW - Cell Death
KW - Cell Proliferation
KW - Cells, Cultured
KW - Cytoprotection
KW - End Stage Liver Disease
KW - Hepatocytes
KW - I-kappa B Kinase
KW - Jaundice
KW - Liver
KW - Liver Cirrhosis
KW - Mice
KW - Mice, Inbred C57BL
KW - Mice, Knockout
KW - P-Glycoproteins
KW - Wasting Syndrome
U2 - 10.1371/journal.pone.0025942
DO - 10.1371/journal.pone.0025942
M3 - SCORING: Journal article
C2 - 22022477
VL - 6
SP - e25942
JO - PLOS ONE
JF - PLOS ONE
SN - 1932-6203
IS - 10
ER -