Cited by 44Drug-Induced Hepatotoxicity and ProtectionLiver physiology and pathologyLiver Disease Diagnosis and Treatment

Constitutive release of CPS1 in bile and its role as a protective cytokine during acute liver injury

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Park, Min-Jung, D’Alecy, Louis G., Anderson, Michelle A., Basrur, Venkatesha, Feng, Yongjia, Brady, Graham F., Kim, Dong-il, Wu, Jun +5 more·2019·Proceedings of the National Academy of Sciences

Abstract

Carbamoyl phosphate synthetase-1 (CPS1) is the major mitochondrial urea cycle enzyme in hepatocytes. It is released into mouse and human blood during acute liver injury, where is has a short half-life. The function of CPS1 in blood and the reason for its short half-life in serum are unknown. We show that CPS1 is released normally into mouse and human bile, and pathologically into blood during acute liver injury. Other cytoplasmic and mitochondrial urea cycle enzymes are also found in normal mouse bile. Serum, bile, and purified CPS1 manifest sedimentation properties that overlap with extracellular vesicles, due to the propensity of CPS1 to aggregate despite being released primarily as a soluble protein. During liver injury, CPS1 in blood is rapidly sequestered by monocytes, leading to monocyte M2-polarization and homing to the liver independent of its enzyme activity. Recombinant CPS1 (rCPS1), but not control r-transferrin, increases hepatic macrophage numbers and phagocytic activity. Notably, rCPS1 does not activate hepatic macrophages directly; rather, it activates bone marrow and circulating monocytes that then home to the liver. rCPS1 administration prevents mouse liver damage induced by Fas ligand or acetaminophen, but this protection is absent in macrophage-deficient mice. Moreover, rCPS1 protects from acetaminophen-induced liver injury even when given therapeutically after injury induction. In summary, CPS1 is normally found in bile but is released by hepatocytes into blood upon liver damage. We demonstrate a nonenzymatic function of CPS1 as an antiinflammatory protective cytokine during acute liver injury.

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Authors
Park, M.-J., D’Alecy, L. G., Anderson, M. A., Basrur, V., Feng, Y., Brady, G. F., Kim, D.-I., Wu, J., Nesvizhskii, A. I., Lahann, J., Lukacs, N. W., Fontana, R. J., & Omary, M. B.
Affiliations
  • University of Michigan (US)
  • Chonnam National University (KR)
  • Åbo Akademi University (FI)
Venue
Proceedings of the National Academy of Sciences
Published
2019-04-12
Volume
116
Issue
18
Pages
9125-9134
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2937232990
Cited by
44
References
57
Citations by year
2026: 2 · 2025: 7 · 2024: 5 · 2023: 8 · 2022: 6 · 2021: 8 · 2020: 5 · 2019: 2
FWCI
5.29
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Åbo Akademi University Research Portal (submittedVersion)
Funders
HHS | National Institutes of Health (R01 DK47918, UL1TR002240, P30 DK34933)
Topics
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Drug-Induced Hepatotoxicity and Protection
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
Keywords
CPS1, bile, acute liver injury, urea cycle enzymes, extracellular vesicles, hepatic macrophages, anti-inflammatory cytokines, acetaminophen hepatotoxicity
MeSH terms
Acetaminophen, Adult, Animals, Bile, Bile Acids and Salts, Carbamoyl-Phosphate Synthase (Ammonia), Female, Humans, Liver, Liver Diseases, Macrophages, Male, Mitochondria, Cytokines, Hepatocytes, Mice, Fas Ligand Protein, Acute Lung Injury

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