TY - JOUR
T1 - A mouse model of accelerated liver aging caused by a defect in DNA repair
AU - Gregg, Siobhán Q.
AU - Gutiérrez, Verónica
AU - Rasile Robinson, Andria
AU - Woodell, Tyler
AU - Nakao, Atsunori
AU - Ross, Mark A.
AU - Michalopoulos, George K.
AU - Rigatti, Lora
AU - Rothermel, Carrie E.
AU - Kamileri, Irene
AU - Garinis, George
AU - Beer Stolz, Donna
AU - Niedernhofer, Laura J.
PY - 2012/2
Y1 - 2012/2
N2 - The liver changes with age, leading to an impaired ability to respond to hepatic insults and increased incidence of liver disease in the elderly. Therefore, there is critical need for rapid model systems to study aging-related liver changes. One potential opportunity is murine models of human progerias or diseases of accelerated aging. Ercc1 -/Δ mice model a rare human progeroid syndrome caused by inherited defects in DNA repair. To determine whether hepatic changes that occur with normal aging occur prematurely in Ercc1 -/Δ mice, we systematically compared liver from 5-month-old progeroid Ercc1 -/Δ mice to old (24-36-month-old) wild-type (WT) mice. Both displayed areas of necrosis, foci of hepatocellular degeneration, and acute inflammation. Loss of hepatic architecture, fibrosis, steatosis, pseudocapillarization, and anisokaryosis were more dramatic in Ercc1 -/Δ mice than in old WT mice. Liver enzymes were significantly elevated in serum of Ercc1 -/Δ mice and old WT mice, whereas albumin was reduced, demonstrating liver damage and dysfunction. The regenerative capacity of Ercc1 -/Δ liver after partial hepatectomy was significantly reduced. There was evidence of increased oxidative damage in Ercc1 -/Δ and old WT liver, including lipofuscin, lipid hydroperoxides and acrolein, as well as increased hepatocellular senescence. There was a highly significant correlation in genome-wide transcriptional changes between old WT and 16-month-old, but not 5-week-old, Ercc1 -/Δ mice, emphasizing that the Ercc1 -/Δ mice acquire an aging profile in early adulthood. Conclusion: There are strong functional, regulatory, and histopathological parallels between accelerated aging driven by a DNA repair defect and normal aging. This supports a role for DNA damage in driving aging and validates a murine model for rapidly testing hypotheses about causes and treatment for aging-related hepatic changes.
AB - The liver changes with age, leading to an impaired ability to respond to hepatic insults and increased incidence of liver disease in the elderly. Therefore, there is critical need for rapid model systems to study aging-related liver changes. One potential opportunity is murine models of human progerias or diseases of accelerated aging. Ercc1 -/Δ mice model a rare human progeroid syndrome caused by inherited defects in DNA repair. To determine whether hepatic changes that occur with normal aging occur prematurely in Ercc1 -/Δ mice, we systematically compared liver from 5-month-old progeroid Ercc1 -/Δ mice to old (24-36-month-old) wild-type (WT) mice. Both displayed areas of necrosis, foci of hepatocellular degeneration, and acute inflammation. Loss of hepatic architecture, fibrosis, steatosis, pseudocapillarization, and anisokaryosis were more dramatic in Ercc1 -/Δ mice than in old WT mice. Liver enzymes were significantly elevated in serum of Ercc1 -/Δ mice and old WT mice, whereas albumin was reduced, demonstrating liver damage and dysfunction. The regenerative capacity of Ercc1 -/Δ liver after partial hepatectomy was significantly reduced. There was evidence of increased oxidative damage in Ercc1 -/Δ and old WT liver, including lipofuscin, lipid hydroperoxides and acrolein, as well as increased hepatocellular senescence. There was a highly significant correlation in genome-wide transcriptional changes between old WT and 16-month-old, but not 5-week-old, Ercc1 -/Δ mice, emphasizing that the Ercc1 -/Δ mice acquire an aging profile in early adulthood. Conclusion: There are strong functional, regulatory, and histopathological parallels between accelerated aging driven by a DNA repair defect and normal aging. This supports a role for DNA damage in driving aging and validates a murine model for rapidly testing hypotheses about causes and treatment for aging-related hepatic changes.
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U2 - 10.1002/hep.24713
DO - 10.1002/hep.24713
M3 - Article
C2 - 21953681
AN - SCOPUS:84856404122
SN - 0270-9139
VL - 55
SP - 609
EP - 621
JO - Hepatology
JF - Hepatology
IS - 2
ER -