Cited by 60Liver physiology and pathologyOrgan Transplantation Techniques and OutcomesDrug-Induced Hepatotoxicity and Protection

A20 protects mice from lethal radical hepatectomy by promoting hepatocyte proliferation via a p21waf1-dependent mechanism.

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Longo, Christopher R., Patel, Virendra I., Shrikhande, Gautam V., Scali, Salvatore T., Csizmadia, Eva, Daniel, Soizic, Sun, David W., Grey, Shane T. +2 more·2005·Hepatology

Abstract

The liver has a remarkable regenerative capacity, allowing recovery following injury. Regeneration after injury is contingent on maintenance of healthy residual liver mass, otherwise fulminant hepatic failure (FHF) may arise. Understanding the protective mechanisms safeguarding hepatocytes and promoting their proliferation is critical for devising therapeutic strategies for FHF. We demonstrate that A20 is part of the physiological response of hepatocytes to injury. In particular, A20 is significantly upregulated in the liver following partial hepatectomy. A20 protects hepatocytes from apoptosis and ongoing inflammation by inhibiting NF-κB. Hepatic expression of A20 in BALB/c mice dramatically improves survival following extended and radical lethal hepatectomy. A20 expression in the liver limits hepatocellular damage hence maintains bilirubin clearance and the liver synthetic function. In addition, A20 confers a proliferative advantage to hepatocytes via decreased expression of the cyclin-dependent kinase inhibitor p21waf1. In conclusion , A20 provides a proliferative advantage to hepatocytes. By combining anti-inflammatory, antiapoptotic and pro-proliferative functions, A20-based therapies could be beneficial in prevention and treatment of FHF. (Hepatology 2005;42:156–164.)

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Crossref · 10.1002/hep.20741

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  • A20 is induced in mice and humans as part of the hepatocyte's regenerative response following hepatectomy.

    “A20, a newly identified player in LR, is induced in mice and humans as part of the hepatocyte’s regenerative response following hepatectomy (15, 20).”

    From A20 promotes liver regeneration by decreasing SOCS3 expression to enhance IL-6/STAT3 proliferative signals (2013) · cites this paper as [15]

    The Results section reports a 13-fold rise in A20 mRNA in mouse liver 24 hours after hepatectomy, and the Discussion identifies A20 as part of the hepatocyte regenerative response. The paper does not show A20 induction after hepatectomy in humans; its reference to human A20 mRNA concerns a gene introduced into mouse livers. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • Short-term overexpression of A20 does not carry a significant carcinogenic risk.

    “Our previous studies however indicate that short-term overexpression of A20 does not carry a significant carcinogenic risk. Indeed, no rAd.A20 treated mice developed liver carcinomas during the 6 months monitoring period (14–16).”

    From A20 promotes liver regeneration by decreasing SOCS3 expression to enhance IL-6/STAT3 proliferative signals (2013) · cites this paper as [15]

    The Discussion says limited rAd-mediated A20 expression may avoid tumor formation and reports no liver neoplasia in treated mice during long-term follow-up. The Results section specifies that surviving mice were monitored for eight weeks, not the six months stated in the citing sentence; this paper therefore does not support that duration. (LLM, conf=0.87)

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  • No rAd.A20 treated mice developed liver carcinomas during the 6 months monitoring period.

    “no rAd.A20 treated mice developed liver carcinomas during the 6 months monitoring period (14–16).”

    From A20 promotes liver regeneration by decreasing SOCS3 expression to enhance IL-6/STAT3 proliferative signals (2013) · cites this paper as [15]

    The section “Mice Engineered to Express A20 Are Protected From Lethality Following Extended and Radical Hepatectomy” reports no liver tumors among surviving mice, including those treated with rAd.A20. However, it says they were monitored for 8 weeks, not 6 months; the longer monitoring period is unsupported. (LLM, conf=0.91)

    Experimental — accuracy not yet measured
  • The extended hepatectomy mouse model is characterized by delayed liver regeneration and a high lethality rate of 50%.

    “the mouse model of EH, characterized by delayed LR and high lethality rate (50%), as to magnify A20’s pro-proliferative mechanism(s) (15).”

    From A20 promotes liver regeneration by decreasing SOCS3 expression to enhance IL-6/STAT3 proliferative signals (2013) · cites this paper as [15]

    In “Mice Engineered to Express A20 Are Protected From Lethality Following Extended and Radical Hepatectomy” (page unavailable), the paper reports 50% survival after extended hepatectomy in noninfected mice, equivalent to 50% lethality in that group. The proliferation results show an advantage for A20-treated mice, but do not establish that liver regeneration in the extended-hepatectomy model was delayed relative to a standard hepatectomy model. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • Hepatocyte cultures transduced with rAd. at MOI 50-200 pfu/cell lead to transgene expression in >95% of cells without toxicity.

    “Hepatocyte cultures (60% confluent) were transduced with rAd. at a multiplicity of infection (MOI) of 50–200 plaque-forming units per cell (pfu/cell), leading to transgene expression in >95% of cells without toxicity (14, 15) (Fig. S1).”

    From A20 promotes liver regeneration by decreasing SOCS3 expression to enhance IL-6/STAT3 proliferative signals (2013) · cites this paper as [15]

    The Cell Culture and Cell Lines section (page unavailable) reports rAd infection of mouse hepatocytes at 25 pfu/cell, with transgene expression in more than 98% of cells and minimal toxicity. It does not support the cited 50–200 pfu/cell dose or 60% confluence, and “minimal toxicity” is not the same as no toxicity. (LLM, conf=0.90)

    Experimental — accuracy not yet measured

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Cites

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1 of the 52 references couldn’t be matched to a known paper.

Research works printed but not linked: 6

  1. Opipari AJ, Hu HM, Yabkowitz R, Dixit VM. The A20 zinc finger protein protects cells from TNF cytotoxicity. J Biol Chem 1992;267:12424- 12427.
  2. Arvelo MB, Cooper JT, Longo C, Daniel S, Grey ST, Mahiou J, et al. A20 protects mice from galactosmine/lipopolysaccharide acute toxic lethal hep- atitis. HEPATOLOGY 2002;35:535-543.
  3. Ferran C, Stroka DM, Badrichani AZ, Cooper JT, Wrighton CJ, Soares M, et al. A20 inhibits NF-B activation in endothelial cells without sensi- tizing to TNF-mediated apoptosis. Blood 1998;91:2249-2258.
  4. Schmid RM, Adler G. NF-kappaB/rel/IkappaB: implications in gastroin- testinal diseases. Gastroenterology 2000;118:1208-1228.
  5. Sun Z, Klein AS, Radaeva S, Hong F, El-Assal O, Pan HN, et al. In vitro interleukin-6 treatment prevents mortality associated with fatty liver trans- plants in rats. Gastroenterology 2003;125:202-215.
  6. Bonham CA, Gerber DA, Grewal H. Live donor transplantation: Strate- gies for expanding the adult organ donor pool. Conference report 2001;1st Annual Winter Symposium: Living donor adult-to-adult transplantation of the kidney and liver.

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Authors
Longo, C. R., Patel, V. I., Shrikhande, G. V., Scali, S. T., Csizmadia, E., Daniel, S., Sun, D. W., Grey, S. T., Arvelo, M. B., & Ferran, C.
Affiliations
  • Harvard University (US)
  • Beth Israel Deaconess Medical Center (US)
Corresponding author
Ferran, Christiane
Venue
Hepatology
Published
2005-07
Volume
42
Issue
1
Pages
156-164
ISSN
0270-9139 (ISSN-L)
OpenAlex
W2025002041
Cited by
60
References
52
Citations by year
2024: 2 · 2023: 1 · 2021: 8 · 2020: 1 · 2019: 2 · 2018: 1 · 2017: 7 · 2016: 4 · 2015: 7 · 2014: 4 · 2013: 5 · 2012: 3
FWCI
1.97
Type
journal article
Language
en
Open access
Locations
Hepatology (publishedVersion)
Funders
  • Beth Israel Deaconess Medical Center
  • Association pour la Recherche sur le Cancer
  • Institut National de la Santé et de la Recherche Médicale
  • National Institutes of Health (NIH T32, DK063275, T32 HL 07734)
  • National Heart, Lung, and Blood Institute (T32 HL-07734)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK063275)
Topics
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
  • Health Sciences › Medicine › Surgery › Organ Transplantation Techniques and Outcomes
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Drug-Induced Hepatotoxicity and Protection
Keywords
A20, radical hepatectomy, acute liver failure, hepatocyte proliferation, p21, NF-κB signaling, hepatocyte apoptosis, liver regeneration, liver injury, inflammation, bilirubin clearance, liver synthetic function

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