Interleukin-6 is required for cell cycle arrest and activation of DNA repair enzymes after partial hepatectomy in mice
Open accessAbstract
BACKGROUND: Interleukin-6 (IL-6) has been shown to be vital for liver regeneration, however the specific mechanisms and factors involved remain incompletely defined. The present study aimed to investigate whether IL-6 exerts its protective effects via arresting the cell cycle allowing base excision and repair of oxidized DNA after hepatectomy. RESULTS: Following seventy percent partial hepatectomy (PH) in wild type (WT) mice IL-6 serum levels increased reaching peak levels at 3 hours. This was associated with markers of cell cycle arrest as p21 expression was increased and cyclin D1 and proliferating cell nuclear antigen (PCNA) expression decreased. In the absence of IL-6, markers of cell cycle arrest were absent and the number of bromodeoxyuridine (BrdU) positive cells was significantly higher at 28, 32 and 36 hours after PH. The mRNAs for DNA repair enzymes, including Neil-1, 8-oxodGTPase, OGG1, Apex1, and UDG (DNA glycosylase) were increased 2 to 4 fold in WT mice at 6 and/or 12 hours after PH compared to IL-6 knockout (KO) mice. The protein levels of Neil1 and OGG1 were also significantly increased in WT mice compared to KO mice. Pathological changes were far greater and survival was less in IL-6 KO mice than in WT mice. Administration of IL-6 in KO mice restored p21 and DNA repair enzyme expression to wild-type levels and survival was improved. CONCLUSIONS: IL-6 caused cell cycle arrest and delayed proliferation during the first day after PH. This delay was associated with the activation of DNA repair enzymes resulting in accurate replication and restoration of hepatic mass.
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A large amount of IL-6 is found in the circulation within 2 hours after PHx before the initiation of cell proliferation, priming hepatocytes to respond to mitogens such as HGF and EGF.
“A large amount of IL-6 is found in the circulation within 2 hours after PHx before the initiation of cell proliferation, priming hepatocytes to respond to mitogens such as HGF and EGF (2, 69).”
From Senescent hepatic stellate cells promote liver regeneration through IL-6 and ligands of CXCR2 (2022) · cites this paper as [69]
The Results section reports a dramatic rise in serum IL-6 after partial hepatectomy, peaking at 3 hours, before the reported proliferation measurements. It does not establish that a large amount was present within 2 hours or that IL-6 primed hepatocytes to respond to HGF and EGF; the Discussion instead focuses on cell-cycle arrest. (LLM, conf=0.86)
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- Authors
- Tachibana, S., Zhang, X., Ito, K., Ota, Y., Cameron, A. M., Williams, G. M., & Sun, Z.
- Affiliations
- Johns Hopkins University (US)
- Corresponding author
- Sun, Zhaoli
- Venue
- Cell & Bioscience
- Published
- 2014-02-03
- Volume
- 4
- Issue
- 1
- Pages
- 6-6
- ISSN
- 2045-3701 (ISSN-L)
- PMC
- PMC3922598
- OpenAlex
- W2154333024
- Cited by
- 43
- References
- 31
- Citations by year
- 2026: 2 · 2024: 2 · 2023: 4 · 2022: 5 · 2021: 2 · 2020: 2 · 2019: 6 · 2018: 5 · 2017: 5 · 2016: 6 · 2015: 2 · 2014: 2
- FWCI
- 2.79
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- cc-by
- Locations
- Cell & Bioscience (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Hepatology › Liver physiology and pathology
- Health Sciences › Medicine › Surgery › Organ Transplantation Techniques and Outcomes
- Health Sciences › Medicine › Rehabilitation › Wound Healing and Treatments
- Keywords
- interleukin-6, partial hepatectomy, liver regeneration, cell cycle arrest, DNA repair, base excision repair, oxidized DNA, p21, OGG1, NEIL1, DNA glycosylase, IL-6 knockout mice, hepatocyte proliferation
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