title: Exaggerated up-regulation of tumor necrosis factor alpha-dependent apoptosis in the older mouse liver following reperfusion injury: targeting liver protective strategies to patient age.
abstract: Although it is becoming increasingly common to accept livers from older donors for transplantation, old livers are more damaged by hepatic ischemia and reperfusion injury (HIRI) than young livers. We hypothesized that this age-related susceptibility to HIRI is due to increased hepatocellular apoptosis driven by tumor necrosis factor alpha (TNFalpha). Young (6-week-old) and old (60-week-old) mice underwent 60 minutes of hepatic ischemia and increasing periods of reperfusion. TNFalpha was determined by enzyme-linked immunosorbent assay. Liver injury (enzyme release), apoptosis (terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate-digoxigenin nick-end labeling staining, cytochrome C release, and caspase activation), and necrosis (hematoxylin and eosin staining) were assessed. We assessed the impact of apoptosis by blocking TNFalpha production or effect (pentoxifylline and TNFalpha receptor knockout), inhibiting apoptotic pathways (caspase inhibition), or imposing a hepatic protective strategy [glucose infusion with ischemic preconditioning (Glc/PC)]. In comparison with young livers, old livers subjected to HIRI had more pronounced liver aspartate aminotransferase release (6200 versus 3900 U/L, P = 0.02), necrosis (45% versus 25%, P = 0.03), and apoptosis with increased 30-minute TNFalpha release (19.02 versus 10.62 pg/mg, P = 0.03). Eliminating TNFalpha production reversed the effect of age, as did inhibition of apoptotic pathways with caspase inhibition. Glc/PC of old mice attenuated TNFalpha release (9.56 versus 19.02 pg/mg, P = 0.001) and age-related exaggerated HIRI and improved survival (60% versus 0%). In conclusion, the age-related susceptibility to HIRI is driven by an exaggerated induction of TNFalpha-dependent hepatocellular apoptosis. Targeting the apoptotic cascade has implications for the older donor liver population.
authors.affiliation: Division of Multiorgan Transplantation, Department of General Surgery, Toronto General Hospital, Toronto, Ontario, Canada.
authors.forename: Markus
authors.initials: M
authors.lastname: Selzner
authors.forename: Nazia
authors.initials: N
authors.lastname: Selzner
authors.forename: Limin
authors.initials: L
authors.lastname: Chen
authors.forename: Ivan
authors.initials: I
authors.lastname: Borozan
authors.forename: Jing
authors.initials: J
authors.lastname: Sun
authors.forename: Max
authors.initials: M
authors.lastname: Xue-Zhong
authors.forename: Jianhua
authors.initials: J
authors.lastname: Zhang
authors.forename: Ian D
authors.initials: ID
authors.lastname: McGilvray
mesh_terms: D000375:Aging / Q000276:immunology*; D000818:Animals; D017209:Apoptosis / Q000276:immunology*; D053148:Caspase 3 / Q000378:metabolism; D045304:Cytochromes c / Q000378:metabolism; D004195:Disease Models, Animal; D020287:In Situ Nick-End Labeling; D019194:Ischemic Preconditioning; D008099:Liver / Q000378:metabolism / Q000473:pathology; D016031:Liver Transplantation / Q000276:immunology*; D017737:Macrophages, Peritoneal / Q000276:immunology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009336:Necrosis; D047888:Receptors, Tumor Necrosis Factor, Type I / Q000235:genetics; D015427:Reperfusion Injury / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D015996:Survival Rate; D014409:Tumor Necrosis Factor-alpha / Q000097:blood* / Q000276:immunology; D015854:Up-Regulation / Q000276:immunology
chemical_list: D047888:Receptors, Tumor Necrosis Factor, Type I; C506236:Tnfrsf1a protein, mouse; D014409:Tumor Necrosis Factor-alpha; D045304:Cytochromes c; C505409:Casp3 protein, mouse; D053148:Caspase 3